37results about How to "Solve the problem of excessive emissions" patented technology

The invention discloses a horizontal chain grate heat medium furnace coupled with side wall grading air and flue gas recirculation. The horizontal chain grate heat medium furnace is composed of a scraper coal feeder, a combustion chamber, a chain grate, a horizontal furnace body and a tail flue. The invention relies on: while arranging the graded air on the two side walls of the horizontal chain grate heat medium furnace, the primary air is fed in sections under the grate to construct the graded combustion conditions in the furnace; from the tail flue between the waste heat boiler The flue gas is extracted from the position between the air preheater and sent to several primary air chambers at the front of the chain grate, which is used to organize the recirculation of the flue gas. As a result, on the one hand, the residence time of coal particles in the furnace away from the stoichiometric combustion state is prolonged; on the other hand, the oxygen concentration in the coal seam combustion zone is diluted, the combustion temperature is reduced, and the combustion intensity is weakened, thereby delaying the combustion process. Finally, low NOx combustion is realized in the coal-fired horizontal chain grate heat medium furnace.

The invention belongs to the technical field of circulating fluidized bed boilers and discloses a furnace desulphurization optimization control method for a circulating fluidized bed. An optimization control system of the furnace desulphurization optimization control method comprises a data communication subsystem, a sulfur content online correction subsystem, a sulfur dioxide prediction subsystem and a limestone control subsystem; data interaction is performed on the data communication subsystem and OPC server communication software of a DCS system; the sulfur content online correction subsystem is connected with the data communication subsystem; the sulfur dioxide prediction subsystem is connected with the sulfur content online correction subsystem and the data communication subsystem; the limestone control subsystem is connected with the sulfur dioxide prediction subsystem and the data communication subsystem. According to the furnace desulphurization optimization control method for the circulating fluidized bed, a sulfur dioxide prediction model and a coal sulfur content self-adaptive correction method are established and accordingly the feeding amount of the limestone can be timely and dynamically adjusted, the excess emissions of the sulfur dioxide and the excessive use of the limestone and other resources are avoided, and the practical value in engineering is high.

The invention provides a tail gas processing method in a biodiesel processing process. The tail gas contains C1-C8 low-carbon alcohol and C1-C8 dialkyl ether. According to the invention, the tails gas contacts water, such that a liquid-phase product containing the C1-C8 low-carbon alcohol and at least partially the C1-C8 dialkyl ether is obtained; tail gas discharged after contacting the water is collected; liquid in the tail gas discharged after contacting the water is removed, and the liquid-removed gas is burned; with a condition for the tail gas to contact the water, the C1-C8 low-carbon alcohol content in the obtained liquid-phase product is at least 1% by weight. When the tails gas produced during a biodiesel processing process is processed by using the processing method provided by the invention, low-carbon alcohol in the tail gas can be effectively recovered, the influence of the burning product to the environment is small, a problem of excessive tail gas discharging in the biodiesel processing process can be effectively solved, and the processing cost is low.

The invention discloses an optimization control method for flue gas circulating fluidized bed desulfurization, which belongs to the technical field of desulfurization of thermal power units. The DCS system is respectively connected to the flue gas circulating fluidized bed and a PLC-based sulfur dioxide optimization control system. The system consists of a sulfur dioxide prediction module and a carbon dioxide calculation module respectively connected to the data communication module and the slaked lime control module, and the slaked lime control module is connected to the data communication module; the data communication module and the DCS system exchange data with each other. The present invention can adjust the feeding amount of slaked lime in a timely, dynamic and accurate manner through the SO2 prediction model and the calculation of the CO2 amount of the flue gas at the inlet of the desulfurization tower, and fundamentally avoids the excessive discharge of SO2 and the waste of resources such as slaked lime, etc. It reduces CO2 emissions to a certain extent, and has high reference significance in engineering.

The present invention discloses a denitration sulphur-fixing agent used for cement rotary kiln flue gas denitration and desulfurization, and a method and an apparatus for cement rotary kiln flue gas denitration and desulfurization using the agent. The denitration sulphur-fixing agent includes a reducing agent with a mass percent concentration of15-25% and a sulphur-fixing agent with a mass percent concentration of 30-55%. The apparatus includes a denitration sulphur-fixing agent preparation system, a denitration sulphur-fixing agent storage system, a denitration sulphur-fixing agent injection system and an automatic control system, wherein the denitration sulphur-fixing agent preparation system, the denitration sulphur-fixing agent storage system and the denitration sulphur-fixing agent injection system are successively connected; and the automatic control system is respectively connected with the denitration sulphur-fixing agent preparation system and the injection system. The unique denitration sulphur-fixing agent provided by the present invention is injected into the nozzle of the cement rotary kiln in two routes. Compared with the conventional technologies of SCR denitration and wet desulfurization, the original production process is unchanged, the method and the apparatus have the characteristics of simple manipulation and economy and high-efficiency.