CN-122015068-A - Treatment system and treatment method for gas slag

Abstract

The invention discloses a treatment system and a treatment method of coal gas slag, which belong to the technical field of coal gas slag treatment and comprise three-waste furnaces, wherein high-temperature flue gas generated by the three-waste furnaces is connected with a boiler system through a high-temperature flue gas pipeline, the boiler system comprises a boiler, the lower end of the boiler is provided with a plurality of inlets, the inlets are used for feeding and air intake to the inside of the boiler, one end of the boiler is connected with a cyclone separator, one end of the cyclone separator is connected with a superheater, one end of the superheater is connected with an economizer in a pulverized coal boiler, one end of the economizer is connected with an air preheater, one end of the air preheater is connected with a dust remover, one end of the dust remover is connected with an induced draft fan, and one end of the induced draft fan is connected with a desulfurizing tower. Can realize the high-efficiency treatment of the gas slag, simplify the flow and effectively control the cost.

Inventors

• Mi Liandong
• JIANG YIKAI
• YU FANGBIN
• HAN GUANGKUN

Assignees

• 临沂正大热能研究所

Dates

Publication Date

20260512

Application Date

20260209

Claims (10)

1. 1. The treatment system for the gas slag comprises a three-waste furnace, and is characterized in that high-temperature flue gas generated by the three-waste furnace is connected with a boiler system through a high-temperature flue gas pipeline, the boiler system comprises a boiler, and the lower end of the boiler is provided with a plurality of inlets which are used for feeding and air intake into the boiler; One end of the boiler is connected with the cyclone separator, one end of the cyclone separator is connected with the superheater, one end of the superheater is connected with the economizer in the boiler, one end of the economizer is connected with the air preheater, one end of the air preheater is connected with the dust remover, one end of the dust remover is connected with the induced draft fan, and one end of the induced draft fan is connected with the desulfurizing tower.
2. 2. The gas slag treatment system of claim 1, wherein the three-waste furnace comprises a main furnace and a secondary furnace, the secondary furnace of the three-waste furnace is connected with the superheater through a high-temperature flue gas pipeline, the cyclone separator and the superheater are connected through a convection tube bundle, and the economizer is arranged in a flue of the boiler.
3. 3. The gas slag processing system of claim 1, wherein the lower end of the boiler is provided with a first inlet, one end of the first inlet is connected with the interior of the boiler, the other end of the first inlet is connected with an air outlet of a second fan through a second fan pipeline, and the second fan pipeline passes through the air preheater.
4. 4. A gas slag processing system as claimed in claim 3 wherein the lower end of the first port is provided with a second inlet, one end of the second inlet is connected with the boiler, the other end of the second inlet is provided with a feeding port, one end of the feeding port is provided with a feeding conveyor, the upper end of the feeding conveyor is provided with a bin, and the material in the bin is conveyed to the feeding port by the feeding conveyor and enters the boiler.
5. 5. The gas-slag treating system of claim 4, wherein the side of the second inlet is connected to the air outlet of the first fan by a pipe.
6. 6. The gas slag treatment system of claim 1, wherein a third inlet is further formed in the lower portion of the boiler, one end of the third inlet is connected with the interior of the boiler, the other end of the third inlet is connected with an air outlet of a first fan through a first fan pipeline, and the first fan pipeline passes through the air preheater.
7. 7. The gas slag processing system of claim 1, wherein a bottom slag discharging port is formed in the bottom of the boiler, a fourth inlet is formed in one side of the bottom slag discharging port, one end of the fourth inlet is connected with the inside of the boiler, and the other end of the fourth inlet is connected with an air outlet of the first fan through a first fan pipeline.
8. 8. The gas slag processing system as set forth in claim 1, wherein a plurality of cyclone separators are provided, a material returning device is provided at a lower end of the cyclone separators, a high-pressure fluidization fan is provided at one side of the material returning device, and an air outlet of the high-pressure fluidization fan is connected with the material returning device through a pipeline.
9. 9. The gas slag processing system as set forth in claim 1, wherein said dust remover is connected to said air preheater via a boiler flue gas duct, and a chimney is disposed at the rear of said desulfurizing tower.
10. 10. A method of treating a gas-slag treatment system as claimed in any one of claims 1 to 9, comprising the steps of: The gas slag enters a three-waste furnace, primary treatment is completed in a proper high-temperature environment in the furnace, high-temperature smoke is finally generated, and the high-temperature smoke is led out to a high-temperature smoke pipeline by a secondary furnace; the high-temperature flue gas enters a boiler system through a high-temperature flue gas pipeline, the flue gas in the circulating fluidized bed boiler is connected between a high-temperature section and a low-temperature section of the superheater, and the flue gas in the pulverized coal boiler is integrated from the economizer; The first fan and the second fan are started, air is conveyed through a first fan pipeline and a second fan pipeline respectively, preheated when passing through the air preheater, then conveyed into the furnace through a first inlet, a third inlet and a fourth inlet of the boiler, fully mixed with fuel and combusted, and further supplementing the flue gas quantity and improving the flue gas heat; the mixed flue gas flows out of the boiler and enters a cyclone separator, solid particles in the flue gas are separated through centrifugal force, the separated solid particles flow back to the boiler through a material returning device at the lower end to be burned again, and a high-pressure fluidization fan provides stable power for the material returning process; The purified flue gas sequentially enters a superheater, an economizer and an air preheater through a convection tube bundle to gradually release heat, and the flue gas is respectively used for heating steam, preheating water supply and air to realize cascade recovery and utilization of heat; And the flue gas after heat recovery enters a dust remover through a boiler smoke exhaust pipeline to remove dust particles in the flue gas, and then the flue gas is sent into a desulfurizing tower through a dust removal pipeline under the traction of a draught fan to remove pollutants such as sulfur oxides.

Description

Treatment system and treatment method for gas slag Technical Field The invention belongs to the technical field of gas slag treatment, and particularly relates to a gas slag treatment system and a gas slag treatment method. Background The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. In the modern coal chemical industry, coal is produced into solid waste, namely gas slag, through core processes of gasification furnace production of synthetic gas and the like, the annual output scale is huge, the current comprehensive utilization rate is low, and a large amount of gas slag which is not effectively treated becomes a prominent problem of industrial development and environmental management. The gas slag contains various harmful substances, serious environmental pollution is caused by improper disposal, health risks can be brought, and huge environmental protection pressure is caused for enterprises. Meanwhile, environmental protection policies are increasingly tightened, enterprises are not only faced with policy constraints of gas slag compliance treatment, but also need to bear annual rising environmental protection treatment cost, and the traditional treatment mode is difficult to meet actual demands. From the standpoint of recycling, the characteristics of the gas slag can not directly enter a conventional coal-fired boiler for blending combustion. After the early-stage high-temperature gasification process, the gas slag does not have volatile matters required by combustion, the content of residual combustible components is low, the combustion performance is poor, and part of combustible components are coated by other substances, so that the combustion reaction is further hindered. The conventional coal-fired boiler has limitations in the aspects of combustion temperature, oxygen concentration, high-temperature area combustion time and the like, if forced mixing combustion can cause incomplete combustion, not only can the recycling utilization be not realized, but also the energy waste can be caused, and the economic and efficient development requirements are not met. At present, related patents of special equipment for cleaning and converting gasified slag disclose that the equipment can realize the effects of removing harmful substances, separating moisture, burning combustible components and the like of the gasified slag by stably maintaining proper reaction temperature, and provides equipment support for centralized treatment of the gasified slag. Meanwhile, related schemes of boiler coupling utilization, such as biomass pyrolysis coupling direct-fired boilers, boiler denitration coupling flue gas waste heat utilization systems and the like, are also presented in the related technical fields, and provide ideas for energy cascade utilization and system optimization, but do not form a special treatment system aiming at the characteristics of coal gasification slag. In the prior art, a coal gas slag treatment process which can be efficiently cooperated with the existing production system of a coal chemical industry enterprise, has low investment and low cost is lacking, and multiple requirements of harmless treatment, recycling utilization and enterprise energy consumption reduction of the coal gas slag are difficult to be simultaneously solved. Disclosure of Invention Aiming at the problems, the invention provides a treatment system and a treatment method for the gas slag, which can realize the efficient treatment of the gas slag, simplify the flow and effectively control the cost. In order to achieve the above purpose, the present invention adopts the following technical scheme: The treatment system for the gas slag comprises a three-waste furnace, and is characterized in that high-temperature flue gas generated by the three-waste furnace is connected with a boiler system through a high-temperature flue gas pipeline, the boiler system comprises a boiler, and the lower end of the boiler is provided with a plurality of inlets which are used for feeding and air intake into the boiler; One end of the boiler is connected with the cyclone separator, one end of the cyclone separator is connected with the superheater, one end of the superheater is connected with the economizer in the boiler, one end of the economizer is connected with the air preheater, one end of the air preheater is connected with the dust remover, one end of the dust remover is connected with the induced draft fan, and one end of the induced draft fan is connected with the desulfurizing tower. As a further technical scheme, the three-waste furnace comprises a main furnace and a secondary furnace, the secondary furnace of the three-waste furnace is connected with the superheater through a high-temperature flue gas pipeline, the cyclone separator is connected with the superheater through a convection tube bundle, and the economizer is arranged in