31results about How to "Reduce smoke temperature deviation" patented technology

A wall-mount horizontal bias direct-flow combustion device relates to a horizontal bias direct-flow combustion device. The invention solves the problems of the prior direct-flow combustor, such as four-corner tangential arrangement, different air supply conditions of coal flows on two sides, high risk of slag deposition due to declination and corrosion at high temperature. First dense / dilute air jet ports and a second air jet port (3) are formed on the water-cooled wall (6) of a furnace cavity (5) and combined to form a group of combustors (7). The central line (31) of the second air jet portand the central line (21) of the first dilute air jet port (2) are positioned in the fire-facing side direction, and have the included angles of alpha 1 and alpha 2 with relative to the water-cooled wall (6), on which the jet ports are positioned. The included angle between the central line (11) of the first dense air jet port and the central line (21) of the first dilute air jet port (2) is alpha3. After-burn air jet ports (4) are arranged on the water-cooled wall (6) or at each corner of the furnace cavity (5). The After-burn air jet ports (4) are positioned above the combustors (7). The wall-mount horizontal bias direct-flow combustion device realizes reasonable combination of coal particles and air, prevents the deflection of coal flow, and ensures stable combustion, low load and lowNOx discharge of boilers.

A low-Nox combustion technology features that the combustion box is divided into primary combustion region, reduction region and burning off region from bottom to top. In the primary combustion region, the multi-layer horizontal coal powder combustion technique is used. In the reduction region the under-oxygen reduction technique is used. The burn0off air is fed into the burning off region. The jet direction of the secondary wind among each two burner layers is deflected clockwise by 10-15 deg. relative to the jet direction of primary wind and coal powder stream. The excessive coefficient of air in reduction region is 1.0. The horizontal direction of burn-off windjet is deflected anticlockwise by 5-10 deg. relative to the jet direction of primary wind. Its advantages are stable and uniform combustion, and low release of Nox.

The invention provides a multi-dimensional air staging low-NOx combustion system and an arrangement method. The stable combustion capability and the pulverized coal combustion efficiency of a boiler during the unit low-load operation stage are not taken into consideration in an existing staging NOx combustion method. During the unit low-load operation stage, if concentrated phase pulverized coal air flow deflects towards the fire-side water-cooled wall at wide angle, the problems that boiler combustion gets worse, slag is agglomerated on the water-cooled wall of the boiler and high-temperaturecorrosion becomes more severe due to reverse rotation of the boiler combustion tangential circle occur very easily. The multi-dimensional air staging low-NOx combustion system comprises main combustors and two-stage over- fire air combustors. The main combustors are arranged at the four corners of a boiler furnace (25) correspondingly. An included angle alpha formed between the central axis (22)of each main combustor and the water-cooled wall of the boiler furnace is 40-43 degrees. A set of secondary air nozzles and primary air nozzles arranged in a spaced mode are arranged on each main combustor.

The invention relates to a method for adjusting deviation of two sides of the reheating steam temperature of a four-corner tangential firing boiler by SOFA air doors. The method for adjusting the deviation of the two sides of the reheating steam temperature of the four-corner tangential firing boiler by the SOFA air doors comprises the steps that horizontal pendulum angles of the SOFA air doors are adjusted; when the deviation of two sides of the reheating steam temperature is removed, vertical pendulum angles of the SOFA air doors are no longer adjusted; when the deviation of two sides of thereheating steam temperature is not removed, the vertical pendulum angles of the SOFA air doors are adjusted; and when the vertical pendulum angles of the SOFA air doors are adjusted, firstly, the vertical pendulum angles of a second SOFA air door and a third SOFA air door are adjusted obliquely upwards, and then, the vertical pendulum angles of a first SOFA air door and a fourth SOFA air door areadjusted to horizontal positions. The adjustment of the reheating steam temperature and temperature-decreased water flow is realized through the cooperative cooperation of the horizontal pendulum angles and the vertical pendulum angles of the SOFA air door, through the nonsynchronous adjustment of the horizontal pendulum angles and the vertical pendulum angles, the deviation of two sides of smoketemperature of the four-corner tangential firing boiler is rapidly reduced, the high-temperature point of the reheater pipe wall is reduced, the problems of large deviation of a reheater outlet stream temperature and the unbalanced temperature-decreased water flow on two sides are solved, finally, the average stream temperature of the reheater outlet is improved, and the temperature-decreased water flow of the reheater is reduced.

The invention discloses a combustion adjustment method for a supercritical boiler capable of performing blending combustion of coke oven gas. The device comprises a supercritical boiler capable of performing blending combustion of coke oven gas. The combustion adjustment method comprises the following steps: adopting nonlinear normal pagoda type air door air distribution openings by virtue of an eight-layer secondary air door, sequentially reducing the air door opening upwards, allowing the air door opening of a burnout air door at a diagonal part to be smaller than the air door opening at another diagonal part, and feeding two layers of secondary air at least by virtue of a gas gun by adopting a normal pagoda type air distribution mode. The normal pagoda type air door distribution opening of the secondary air door and different air door openings at two diagonal parts of the burnout air door are adopted, and multilayer air is fed by virtue of the gas gun, so that the fume temperature deviation at the hearth outlet can be effectively reduced, and the detonation accidents of the boiler are reduced. Moreover, according to stable combustion in a fuel enriched area on the middle lower part of the hearth and feeding of the gas gun, the NOx generation amount is greatly reduced, the boiler operates in a high-efficiency economic performance area, the comprehensive operating cost is reduced, and the adjustment method is simple.

The invention relates to a method for adjusting boiler burn-out air based on dynamic moment. The technical solution is to sum the momentum moments of burners with opposite rotation directions in the main combustion zone to obtain the anti-tangential wind momentum moment; and rotate the main combustion zones to the same combustion The sum of the momentum moment of the burner is the tangential wind momentum moment; the sum of the antitangential wind momentum moment and the sum of the tangential wind momentum moment are compared, and the inverse tangential angle of the overburning air is adjusted through the overburning air adjustment mechanism until the ratio is between 0.8 and 1.2 During the period, the present invention realizes the hot state adjustment effect through the cold state test, simplifies the work flow and workload, and greatly improves the working efficiency. Make the flue gas in the horizontal flue of the boiler evenly distributed, finally the ash accumulation in the horizontal flue is uniform, and the ash fall has no effect on the boiler disturbance, the negative pressure no longer fluctuates greatly, and the deviation of the flue gas and steam temperature in the horizontal flue is reduced , Improve the safe operation of the boiler.

The invention relates to a coal-fired boiler secondary air valve baffle control method based on burner heat loads. The secondary air valve aperture is set according to different burning characteristics of burners on all layers, the secondary air interlayer distribution is controlled, and real-time matching control over secondary air distribution of burner areas and the heat loads of the burners on all layers is carried out. Compared with the prior art, the coal-fired boiler secondary air valve baffle control method has the advantages that burning conditions of the different heat loads of the burners can be met, the boiler burning economical efficiency is improved, the NOx emission is reduced, and the smoke temperature deviation is reduced.

The invention relates to a wall type arrangement direct-current pulverized coal combustion technology used for an industrial pulverized coal boiler, and belongs to the pulverized coal boiler filed. The problems of slag bonding and high temperature corrosion of present industrial pulverized coal boilers are solved in the invention. The boiler comprises a boiler body, the boiler body comprises a front wall, a rear wall and a hearth formed in the boiler body, each of the front wall and the rear wall is provided with at least one direct current combustor connected with the hearth, and the direct current combustor of the front wall is arranged facing to the direct current combustor of the rear wall. The wall type arrangement direct-current pulverized coal combustion technology can avoid the slag bonding caused by the phenomena comprising too large tangent circle and deflective wall attachment, and has low requirements on the shape of the cross section of the hearth because of the wall type arrangement combustion mode, so with the increase of capacity of a set, the width of the hearth needs to be increased, there is no need to increase the depth of the hearth, the capacity of the boiler is not restricted by the sectional area of the hearth, and it is convenient to carry out the arrangement of the heated surface of a tail portion.

The invention provides hexagonal or octagonal tangential arrangement of anthracite burning single-fireball direct-flow combustors, which is characterized in that: two groups of combustors are arranged on each water-cooling wall or two groups of combustors are arranged on two opposite water-cooling walls of a hearth respectively and a group of combustors are arranged on the other two opposite water-cooling walls respectively, each group of combustors are at least divided into a small group; and each small group of combustors are vertically provided with at least two primary air pulverized nozzles and three secondary air pulverized nozzles at intervals. Each coal mill is connected with eight or six primary air pulverized nozzles which have the same level with that of the coal mill. The start and stop of each coal mill affect the running of the eight or six primary air pulverized nozzles which are on the same layer. The hexagonal or octagonal tangential arrangement of the anthracite burning single-fireball direct-flow combustors can decrease the number of the air pulverized nozzles in a single group of combustors on the premise of meeting the requirements of the thermal power of a single air pulverized nozzle and the number of the total air pulverized nozzles, allows the thermal load qHr of a wall in a combustor area to be relatively high, and guarantees the timely ignition of anpulverized anthracite flow and low-load combustion of a boiler without oil.

The invention relates to a technology for relieving scorification of a convection heated surface of a boiler, in particular to a system for relieving scorification of the convection heated surface of a boiler. The system comprises a crust block machine arranged in a flue of a boiler, wherein the crust block machine is positioned at the front end of the windward side of a convection superheater at the top of the flue; the crust block machine comprises two symmetrically arranged disks and a straight pipe fixedly arranged between the two disks; and the crust block machine can roll in the axial direction of the flue. The crust block machine is applicable to various boilers using high-alkali metal content coal; scorification can be made in advance; safe operation of the convection heated surface is ensured; the operation time of the boiler is increased; offset of smoke temperature at a hearth outlet and uneven flow field caused by combustion of a quadrangle tangent circle boiler are reduced by the arrangement of the crust block machine; frequent explosion of the convection superheater and the reheater is avoided; normal operation of the boiler is not affected in the process of slag removal and scorification cleaning; the operation time of the boiler is prolonged; and the economical efficiency of a power plant is improved.

The invention provides hexagonal or octagonal tangential arrangement of fuel-oil or fuel-gas single-fireball direct-flow combustors, which is characterized in that: six or eight groups of combustors are arranged in a hearth; each group of combustors are vertically provided with at least two oil guns or gas guns at intervals, two fuel blast nozzles and three secondary blast nozzles; the fuel oil or the fuel gas at a fuel oil or fuel gas operation station outlet in front of the furnace is connected with at least two layers of oil guns or gas guns arranged on four walls of a boiler through fuel oil or fuel gas pipelines; and each layer of oil guns or gas guns consist of six or eight oil guns or gas guns which are in the same level but not in the same group. The hexagonal or octagonal tangential arrangement of the fuel-oil or fuel-gas single-fireball direct-flow combustors can ensure that the distance between the uppermost and undermost two oil guns or gas guns and the thermal load of thewalls of the combustor area are controlled in ideal ranges, the total height of the boiler is decreased and the manufacturing cost of the boiler is greatly reduced. Because air supplying conditions on two sides of a jet flow are good, flames of the oil guns or gas guns are not easy to attach to the walls and the safety of the work of a water-cooling wall is improved.

The invention discloses a burn-off air system arranged vertically and horizontally in a tangential boiler air staged combustion, including a furnace, a hot air box, a pulverized coal pipeline, a primary air nozzle, a secondary air nozzle, a compact burn-off air nozzle, and a corner separated combustion chamber. Exhaust air nozzles, wall-type separated overfire air nozzles, etc., this system is innovative in the conventional way of arranging the overfire air at the corner of the boiler along the furnace height direction of the tangential boiler. The corner separated burn-off air nozzle and the wall-type separated burn-off air nozzle can achieve the purpose of reducing the air excess coefficient in the main combustion area and reducing the generation of NOx. The invention can ensure sufficient burn-off air rate, reasonable reduction zone length, good post-mixing in the furnace and sufficient burn-out time, effectively eliminate residual flue gas rotation and temperature deviation, and take into account the suppression of NOx generation and the promotion of pulverized coal burn-out meet the needs of boiler operation safety, economy and environmental protection.

The invention belongs to a method for the on-line monitoring and alarming of a convection heating face flue gas temperature field of a power station boiler, which comprises the steps of calculating the average value of temperatures of furnace inner walls on inlet and outlet planes according to monitoring values of the temperatures of the furnace inner walls; additionally arranging flue gas temperature monitoring points at two sides; amending a flue gas average temperature; calculating the flue gas temperature of each point in the inlet and outlet planes of the heating faces, and the flue gas temperature of various planes vertical to the inlet and outlet planes of the heating faces; automatically generating a planar dynamic flue gas temperature colorful distribution diagram; and displaying in real time and providing site conditions and timely adjusting work conditions. The method disclosed by the invention realizes the accurate data monitoring and corresponding and visual diagram distribution display of flue gas temperature fields in the inlet and outlet planes and various longitudinal and horizontal planes vertical to the inlet and outlet planes of each convection heating face of superheater and reheater pipeline systems, provides direct data support for adjusting the burning work condition of the operation site of the power station boiler, and realizes the safe and economic operation of the convection heating faces of the superheater and reheater pipeline systems of the power station boiler.

The invention discloses a tower-type boiler outlet guide method and mechanism and a boiler. The guide method specifically comprises the steps that the position, close to the top of a hearth, of the front wall of an existing tower-type boiler and the position, close to a horizontal flue, of the rear wall of the existing tower-type boiler are bent towards the inside of the boiler by a certain angle to be connected with the horizontal flue, and then the outlet guide mechanism is formed. The outlet guide mechanism enables flue gas in an upper hearth heat exchange area to enter the horizontal flue after the direction is changed; dwelling time of hearth left side flue gas inside the boiler is correspondingly lengthened, flue gas distribution is more even, and temperature differences of flue gas on the left side, the right side, the front side and the rear side of the hearth are effectively reduced; and at the same time, the outlet guide mechanism prevents the flue gas in the upper hearth heat exchange area from seriously deflecting towards the rear wall of the hearth, abrasion from dust particles in the flue gas to the tube walls of heat exchangers close to the rear wall is reduced, and safe operation of a unit is facilitated.