39results about How to "Reduce low temperature corrosion" patented technology

The invention discloses a waste heat recovery system and method with discharged smoke waste heat as a heat source of an air heater. According to the waste heat recovery system and method with the discharged smoke waste heat as the heat source of the air heater, a low-temperature economizer and the air heater are connected through a pipeline to form a first circulation loop, a circulating pump is arranged on an inlet pipeline of the low-temperature economizer, and an air heater intake water regulating valve is arranged on an inlet pipeline of the air heater; and the low-temperature economizer is connected with the circulating water side of a condensed water heater through a pipeline to form a second circulation loop, the condensed water side of the condensed water heater is connected with a low-pressure heater in parallel through a pipeline, and a booster pump is arranged on a condensed water connecting pipeline between the condensed water side of the condensed water heater and the low-pressure heater. The system and method have the advantages that the air heater is reserved, low-temperature corrosion of an air preheater is relieved, the low-temperature economizer recovers discharged smoke waste heat of a boiler, and power generation coal consumption of a steam turbine is reduced; and meanwhile, the defects that since the air heater consumes low-pressure suction steam of the steam turbine, the heat consumption of the steam turbine is increased, the temperature of discharged smoke is increased, and the heat efficiency of the boiler is reduced are overcome, and the problems that a low-temperature economizer pipeline system is high in cost and operating reliability requirement are solved.

The invention relates to a circulating fluidized bed boiler unit for high efficiency combustion of biomass and recovery of waste heat. The circulating fluidized bed boiler unit comprises a hearth, a tail flue and a secondary air distribution system and is characterized in that the tail flue is provided with three tandem parallel channels, i.e., a first tail flue, a second tail flue and a third tail flue , an inlet of the first tail flue is connected with a horizontal flue outlet of a cyclone separator, the outlet steers 180 DEG and is then connected with an inlet of the second tail flue, an outlet of the second tail flue steers 180 DEG and is then connected with an inlet of the third tail flue, a heating surface is arranged in the tail flue, a coarse-pitch tipping-tube medium-temperature superheater is arranged in the first tail flue, the secondary air distribution system is an air distribution structure with upper-lower and horizontally left-right staggered junction formed by air distribution units staggerly arranged at the lower part, the waist part and the central part of the front and rear walls of the hearth, and the air distribution structure enables multiple layers of secondary air jet to be mutually crosswise sprayed into the hearth in a height direction and a horizontal direction. The boiler unit provided by the invention has high combustion efficiency, discharges a small amount of CO, reduces fly ash content in flue gas and guarantees that main steam parameters accord with design requirements.

The invention discloses a variable-flue-cross-section tubular air preheater. The air preheater comprises an air preheater shell and adopts a horizontal arrangement mode. Smoke flows in from a lower smoke inlet and flows out from an upper smoke outlet. The outer surface of a heat exchange tube bundle horizontally arranged is scoured in the flowing process, and air flows in the heat exchange tube. Heat is continuously transferred to the air by the smoke through the wall surface of the heat exchange tube, and the flow rate of the smoke is gradually reduced with the gradual decline of the temperature of the smoke in order to prevent severe safety risk caused by dust deposition on the back surface of the heat exchange tube bundle close to the smoke outlet due to the too-large decrease of the flow rate of the smoke. By adopting the design of a constant pressure smoke flowing channel, the cross section of the smoke inlet is larger than the cross section of the smoke outlet, and the smoke flowing channel is gradually reduced, so that the smoke flow rate of the smoke outlet still can be kept larger than or equal to the smoke flow rate of the smoke inlet under the condition that the temperature of the smoke is gradually reduced. The design can increase the wall temperature of the heat exchange tube by about 10-30DEG C than a vertical arrangement mode and effectively reduce the low-temperature corrosion and dust deposition coupling function of the heat exchange tube at the smoke side.

The invention discloses a waste heat circulation system for a direct air cooling tower. The waste heat circulation system is composed of a desalting water tank, a filter screen, a high-pressure pump, a regulating valve and an air cooling unit, wherein the desalting water tank, the filter screen, the high-pressure pump, the regulating valve and the air cooling unit are sequentially connected through pipelines. The air cooling unit is composed of a direct air cooling tower and a draught fan located on the lower portion of the interior of the air cooling unit, wherein the direct air cooling tower is formed by obliquely building fin pipes. Spray nozzles are further arranged above the draught fan. Air flows into the air cooling unit above through the spray nozzles. Multiple sets of air suction pipelines are arranged on the exterior of the direct air cooling tower in parallel and are fixed above the interval spaces of the adjacent fin pipes in the axial direction of the fin pipes correspondingly. Air suction openings are further formed in the lower portions of the air suction pipelines. Waste heat air between the fin pipes enters the air suction pipelines through the air suction openings. The output ends of the air suction pipelines are in butt joint with air feeder air feed pipelines of a boiler. Hot air at an outlet of a direct air cooling condenser is used for air used for boiler combustion, recycling of hot air at an outlet of the direct air cooling tower is achieved, the utilization rate of fuel is increased, thermal pollution is reduced, and the effects of energy conservation and emission reduction are achieved.

The invention discloses a skid-mounted water injection boiler, which includes a furnace body, a furnace tube, a burner, and a chimney, wherein the furnace body includes a radiation heating section and a convection heating section, and the furnace tube is a spiral coil tube along the length of the furnace body. The direction extension is located in the radiation heating section, the chimney is located at the tail of the convection heating section, and the water injection boiler also includes a preheating tube located in the convection heating section for preheating the water or medium injected into the furnace tube, and along the convection heating section. The extension direction is arranged on the right side of the preheating pipe and connected with the heating pipe, the connecting pipe for connecting the heating pipe with the furnace pipe, the skid seat arranged under the furnace body along the extending direction of the furnace body, And connecting seats respectively used for connecting the radiation heating section and the convection heating section to the skid base. The invention not only enables the furnace tube to be heated evenly in the radiant section, but also effectively reduces the low-temperature corrosion at the tail end of the furnace body. At the same time, the furnace body and the burner are integrated into a skid, which is convenient for transportation and on-site installation.

The invention discloses an exhaust gas waste heat recovery and emission reduction comprehensive application system for a coal-fired boiler in a thermal power plant. In the invention, along the flow direction of flue gas, an air preheater, a first low temperature economizer, a low temperature dust collector, a draught fan, a second low temperature economizer and a desulfuration island are sequentially arranged on a pipe between the boiler and a chimney, wherein, the inlet of the air preheater is respectively communicated with a cold primary air pipe and a cold secondary air pipe; the cold secondary air pipe is provided with a secondary air heater; the secondary air heater is communicated with the second low temperature economizer via a coal-water pipe; the coal-water pipe is provided with an expansion tank and a water pump; and the low temperature economizer is divided into two segments, wherein, one segment is used for heating condensed water, and the other section is used for heating the cold secondary air at the inlet of the air preheater by virtue of a water medium. The exhaust gas waste heat recovery and emission reduction comprehensive application system has the beneficial effects of maximally utilizing the gas waste heat, reducing heat consumption of a machine set, lowering energy consumption of equipment such as the dust collector, the draught fan, a blower and the like, reducing the power consumption rate of the thermal power plant, improving the economical efficiency of the thermal power plant, more efficiently saving the energy consumption, and benefiting construction of the lowcarbon society.

The invention provides a device for controlling smoke exhaust temperature of a refuse burning waste heat boiler, and belongs to the smoke exhaust temperature control technology field of the refuse burning waste heat boiler. The device for controlling the smoke exhaust temperature of the refuse burning waste heat boiler comprises a main water feed pipeline, a water feed three way regulation valve,a heater inlet pipeline, a boiler barrel, a heater, a heater outlet pipeline, a main water feed mixing pipeline and a coal economizer collecting box, wherein an inlet of the water feed three way regulation valve communicates with the main water feed pipeline, an outlet I of the water feed three way regulation valve communicates with an inlet of the main water feed mixing pipeline, an outlet II ofthe water feed three way regulation valve communicates with the heater inlet pipeline, the heater inlet pipeline communicates with a heater inlet, a heat outlet communicates with the heater outlet pipeline, the heater outlet pipeline communicates with an inlet of the main water feed mixing pipeline, an outlet of the main water feed mixing pipeline communicates with the coal economizer collecting box, and the heater is arranged in a water phase area of the boiler barrel.

A smoke heater with a defogging function comprises an outer shell. Four rows of waist circular tubes are arranged at the front end of a straight section of the outer shell. The first row of waist circular tubes and the fourth row of waist circular tubes are arranged vertically and are communicated with a water inlet collecting box and a water outlet collecting box respectively. The second row of waist circular tubes and the third row of waist circular tubes are arranged in a V shape. The four rows of waist circular tubes are connected through waist circular tube connecting bending heads to form a snake-shaped pipe. The waist circular tubes are arranged in a narrow-gap mode. A plurality of rows of finned pipes which are arranged horizontally are arranged at the back end of the straight section of the outer shell. The finned pipes are communicated with collecting boxes arranged at the two ends of the outer shell. The four rows of waist circular tubes and the multiple rows of finned pipes form a heat exchanging pipe bundle which divides the smoke heater into a wet smoke zone and a dry smoke zone. The smoke heater can heat smoke and further lower droplet content in the smoke, defogging and heating are combined, smoke temperature is raised, so that smoke lift force is improved, contaminant dispersing concentration is lowered, lime rain is avoided, smoke humidity is lowered, and corrosion on a flue and a chimney from acid droplets is lowered.

The invention discloses a medium-speed coal mill with a deashing desulfurizing device, comprising a coal feeding pipe, a conical shell, a coarse powder separator retainer, a grinding ring and the deashing desulfurizing device.The conical shell is disposed outside the coal feeding pipe.The coarse powder separator retainer is disposed at the top of the conical shell.The grinding ring is disposed below the conical shell.The deashing desulfurizing device comprises am impurity separating module, an impurity discharge pipe and an impurity sensing module; the impurity separating module is disposed at the bottom of the conical shell of the medium-speed coal mill, the impurity sensing module is disposed outside the medium-speed coal mill, and the impurity separating module and the impurity sensing module are communicated through the impurity discharge pipe.The medium-speed coal mill with the deashing desulfurizing device has the advantages that output of the coal mill is increased, power consumption per unit powder production is reduced, equipment abrasion is reduced, water-cooled wall high-temperature corrosion and lagging tendency is reduced, low-temperature corrosion of boiler tail heated surface is reduced, sulfur emission of power plants is reduced and running cost of a desulfurizing system is reduced; the removed impurity is recyclable, and benefit can be maximized.

The invention relates to a device and a method for recycling smoke condensate heat energy of a gas boiler in a heat pumping mode. The device and method for recycling the smoke condensate heat energy of the gas boiler with high heat energy recycling rate do not exist at present. The device provided by the invention comprises a high-efficient condensate heat exchanger, a primary circulating water heat exchanger outlet pipe, a smoke inlet pipe and a smoke outlet pipe, and is characterized by further comprising a heat pump unit, a primary circulating water heat pump inlet pipe, a primary circulating water heat pump outlet pipe, a primary circulating water pump, a domestic hot water taking pipe, a primary circulating water replenishing pipe, a secondary circulating water pump, a secondary circulating water heat pump inlet pipe and a secondary circulating water heat pump outlet pipe, wherein one end of the primary circulating water heat pump outlet pipe and one end of the primary circulating water replenishing pipe are both connected with the other end of a primary circulating water heat exchanger inlet pipe; the secondary circulating water pump is mounted on the secondary circulating water heat pump inlet pipe; a secondary circulating water heat pump outlet temperature gauge is mounted on the secondary circulating water heat pump outlet pipe. The device provided by the invention is high in heat energy recycling rate.

Disclosed is a membrane water-wall compound return water condensing type natural gas hot water boiler. The natural gas hot water boiler is characterized in that a gas collector is connected with a primary pipe network water supply pipe (21) in pipelines; return water of a primary pipe network return water pipe (20) in the pipelines sequentially passes a lower water header, a lower header, a first heat exchanging pipe, an upper header and an upper water header of an economizer and a rear-membrane type water wall, a mid-partition membrane type water wall, a left-membrane type water wall, a front-membrane type water wall and a convection bank of a hearth (5) to be finally converged in an upper boiler barrel; the pipelines further include a secondary network water return pipe (22) and a secondary pipe network water supply pipe (23), and return water of the secondary pipe network return water pipe sequentially passes a branched water header (31), a second heat exchanging pipe (32) and a water header (33) of a condenser; one end of the water header is connected with the secondary pipe network water supply pipe while the other end is plugged. The membrane water-wall compound return water condensing type natural gas hot water boiler has certain universality, heat utilization rate of the boiler is increased, fuel cost during operation is lowered, and service life of boiler equipment is prolonged.

The invention belongs to the technical field of new energy, efficient energy saving and energy saving of high-energy-consuming industries such as a power industry and particularly relates to a copper-chromium-based TGr-titanium film thread pipe type air preheater and a pipe film component. According to the copper-chromium-based TGr-titanium film thread pipe type air preheater and the pipe film component, a base pipe and a copper-chromium-based TGr-titanium film layer are included. The copper-chromium-based TGr-titanium film layer is arranged on the outer side of the base pipe. The copper-chromium-based TGr-titanium film thread pipe type air preheater and the pipe film component have the advantages that the heating area can be increased through threads, so that air side heat transferring capacity is greatly improved, meanwhile, flue gas flow speed is reasonably selected, under ripple disturbance, ash deposition phenomena hardly exist, heat transferring capacity is improved, so that wall temperature is improved, low-temperature corrosion is lowered, flue gas side heat is well used, the burning state is improved, and efficiency is improved.

The invention discloses a horizontal-type enamel pipe air pre-heater. According to the horizontal-type enamel pipe air pre-heater, the problems that in the prior art, the air pre-heater is low in heat exchanging efficiency and large in size, and a pipe can be frequently replaced caused by the fact that the heat exchanging pipe is prone to being damaged are solved. The air pre-heater has the effects that heat exchanging efficiency is high, the size is reduced, and the phenomenon that the pipe is frequently replaced because of corrosion and damage is avoided. According to the technical scheme, the horizontal-type enamel pipe air pre-heater comprises a pre-heater shell and a storehouse pump; the pre-heater shell is of a horizontal-type structure, a smoke inlet is formed in one side of the pre-heater shell, and a smoke outlet is formed in the other side of the pre-heater shell; an enamel pipe heat exchanging pipe is arranged in the pre-heater shell and adopts a TEPEE pipe discharging mode and is internally provided with a spiral twisted stripe driven through the air flow rate; and the storehouse pump is arranged on the side of the smoke outlet of the pre-heater shell, and therefore accumulated dust on the enamel pipe heat exchanging pipe can be output in time.

The invention discloses a low-temperature flue gas water recovery and waste heat utilization coupling system and operation method of a coal-fired power station. device, low-temperature flue gas cooler, electrostatic precipitator, desulfurization tower, flue gas condenser, flue gas reheater, chimney, first and second air heaters, multiple circulating water pumps and multiple control valves; through multiple The flue gas heat exchanger recovers the waste heat of the low-temperature flue gas to the steam turbine recuperation system or is used for preheating the air to reduce the coal consumption of the unit; the water is recovered through the flue gas condenser; the flue gas is reheated through the flue gas reheater to reduce the impact on the chimney Low-temperature corrosion; the operation of the flue gas heat exchanger can be adjusted through the control valve, and it can work together with other flue gas heat exchangers in series under different working conditions to ensure that the temperature of the flue gas entering the electrostatic precipitator is maintained above 90°C, ensuring that the flue gas entering the electrostatic precipitator The circulating water temperature of the low-temperature flue gas cooler is above 70°C to meet the safe operation of the system under different ambient temperatures.

The invention discloses a waste heat recovery system and method with discharged smoke waste heat as a heat source of an air heater. According to the waste heat recovery system and method with the discharged smoke waste heat as the heat source of the air heater, a low-temperature economizer and the air heater are connected through a pipeline to form a first circulation loop, a circulating pump is arranged on an inlet pipeline of the low-temperature economizer, and an air heater intake water regulating valve is arranged on an inlet pipeline of the air heater; and the low-temperature economizer is connected with the circulating water side of a condensed water heater through a pipeline to form a second circulation loop, the condensed water side of the condensed water heater is connected with a low-pressure heater in parallel through a pipeline, and a booster pump is arranged on a condensed water connecting pipeline between the condensed water side of the condensed water heater and the low-pressure heater. The system and method have the advantages that the air heater is reserved, low-temperature corrosion of an air preheater is relieved, the low-temperature economizer recovers discharged smoke waste heat of a boiler, and power generation coal consumption of a steam turbine is reduced; and meanwhile, the defects that since the air heater consumes low-pressure suction steam of the steam turbine, the heat consumption of the steam turbine is increased, the temperature of discharged smoke is increased, and the heat efficiency of the boiler is reduced are overcome, and the problems that a low-temperature economizer pipeline system is high in cost and operating reliability requirement are solved.