A method for municipal sludge coupling and blending combustion of a million-kilowatt ultra-supercritical unit

Abstract

A kind of municipal sludge coupling blending combustion method of million kilowatt ultra-supercritical unit.When the water content of sludge fluctuates sharply, the coal mill simultaneously undertakes the dual task of grinding raw coal and drying wet sludge, and interferes with each other;High-moisture sludge will squeeze the drying capacity of the coal mill, resulting in the grinding fineness of raw coal not meeting the standard, and the output of the coal pulverizing system being limited.The present application comprises the following steps: the sludge transported by tank car is transported into the storage room in a sealed manner, the sludge in the storage room is deodorized under negative pressure, and the sludge in the storage room is discharged into the drying device for drying;The dried sludge is sent into the shear crusher, which can mechanically pre-crush the dried and caked sludge, eliminating the impact vibration caused by large sludge lumps entering the mill;The crushed sludge and coal are sent into the distributor for distribution, and the distributed sludge and coal are sent into the drum mixer for mixing, and then into the coal mill for grinding.The present application is used for municipal sludge coupling blending combustion.

Description

Technical Field

[0001] This invention relates to a method for coupled co-firing of municipal sludge in a megawatt ultra-supercritical unit. Background Technology

[0002] In existing sludge co-firing systems, sludge is directly stockpiled in the coal yard, and a screw conveyor feeds it onto a coal conveyor belt to mix with raw coal. The sludge is then dried synchronously inside the coal mill, with drying and grinding coupled within the same equipment. When the sludge moisture content fluctuates drastically, the coal mill simultaneously undertakes the dual tasks of grinding raw coal and drying wet sludge, causing mutual interference. High-moisture sludge will crowd out the drying capacity of the coal mill, resulting in the raw coal not reaching the required fineness and limiting the output of the pulverizing system. Summary of the Invention

[0003] The purpose of this invention is to solve the above-mentioned technical problems and provide a method for co-firing municipal sludge in a megawatt ultra-supercritical unit.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A method for coupled co-firing of municipal sludge in a 1,000 kW ultra-supercritical power unit, comprising the following steps: (1) The sludge transported by tanker truck is sealed and transported into the storage room. The storage room is deodorized under negative pressure. The sludge in the storage room will be discharged into the drying device for drying. (2) The dried sludge may clump together. The dried sludge is fed into the shearing crusher. The shearing crusher can mechanically pre-crush the dried clump sludge to eliminate the impact vibration caused by large mud clumps entering the mill. (3) The crushed sludge and coal are fed into the distributor for distribution. The distributed sludge and coal are then fed into the drum mixer for mixing. After mixing, the mixture is fed into the coal mill for grinding.

[0005] The method for coupled co-firing of municipal sludge in a megawatt ultra-supercritical unit, wherein the storage room is connected to the drying device, and the outlet of the drying device is connected to the inlet of the shear crusher. The feeder has a coal inlet and a sludge inlet, and the outlet of the shear crusher is connected to the inlet of the feeder. The outlet of the feeder is connected to the inlet of the drum mixer, the outlet of the drum mixer is connected to the inlet of the coal mill, and the outlet of the coal mill is connected to the boiler through a pipeline.

[0006] The method for coupled co-firing of municipal sludge in a megawatt ultra-supercritical unit, wherein the steam outlet of the drying device is connected to the cyclone separator via a pipeline.

[0007] The aforementioned method for coupled co-firing of municipal sludge in a megawatt ultra-supercritical unit involves connecting the odor outlet of the storage room and the steam outlet of the cyclone separator to the boiler secondary air pipeline via pipelines. Beneficial effects

[0008] 1. The present invention sets up a drum mixer, which is arranged after the material distributor. After the raw coal and sludge are initially spread, the materials are sent into the drum mixer for mixing, so as to achieve deep mixing of sludge and raw coal and solve the problem of surface mixing and material stratification caused by single-point material distribution.

[0009] 2. By incorporating a shearing crusher, this invention can mechanically pre-crush dried, agglomerated sludge, eliminating the impact and vibration caused by large sludge clumps entering the mill.

[0010] 3. In this invention, the exhaust gas generated during drying carries fine sludge powder, which is then captured by a cyclone separator. The captured fine sludge particles are returned to the feed end of the drying device, and the steam exhaust gas is sent to the boiler's secondary air for high-temperature decomposition. This achieves internal recovery of the drying dust, prevents the escape of fine sludge powder, and reduces material loss. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of the present invention; In the diagram: 1. Tanker truck; 2. Storage room; 3. Cyclone separator; 4. Drying device; 5. Shear crusher; 6. Coal bunker; 7. Distributor; 8. Drum mixer; 9. Coal mill; 10. Boiler; 11. SCR denitrification; 12. Dust collector; 13. Desulfurization device. Detailed Implementation

[0012] See Figure 1 A method for coupled co-firing of municipal sludge in a megawatt-class ultra-supercritical power unit, comprising the following steps: (1) The sludge transported by tanker truck is sealed and transported into the storage room. The storage room is deodorized under negative pressure. The sludge in the storage room will be discharged into the drying device for drying. (2) The dried sludge may clump together. The dried sludge is fed into the shearing crusher. The shearing crusher can mechanically pre-crush the dried clump sludge to eliminate the impact vibration caused by large mud clumps entering the mill. (3) The crushed sludge and coal are fed into the distributor for distribution. The distributed sludge and coal are then fed into the drum mixer for mixing. After mixing, the mixture is fed into the coal mill for grinding.

[0013] A method for coupled co-firing of municipal sludge in a megawatt ultra-supercritical unit, comprising a storage room 2, a drying device 4, a shear crusher 5, a feeder 7, and a drum mixer 8; The storage room is connected to the drying device, and the outlet of the drying device is connected to the inlet of the shearing and crushing machine. The feeder has a coal inlet and a sludge inlet, and the outlet of the shear crusher is connected to the inlet of the feeder. The outlet of the feeder is connected to the inlet of the drum mixer, the outlet of the drum mixer is connected to the inlet of the coal mill, and the outlet of the coal mill is connected to the boiler 10 through a pipeline; The flue gas from boiler combustion is desulfurized by SCR denitrification 11, dust collector 12, and desulfurizer 13; The method for coupled co-firing of municipal sludge in a megawatt ultra-supercritical unit, wherein the steam outlet of the drying device is connected to the cyclone separator 3 via a pipeline.

[0014] The aforementioned method for coupled co-firing of municipal sludge in a megawatt ultra-supercritical unit involves connecting the odor outlet of the storage room and the steam outlet of the cyclone separator to the boiler secondary air pipeline via pipelines.

[0015] Working principle: Sludge transported by tanker trucks is sealed and transported into a storage room. The storage room is deodorized under negative pressure. The sludge in the storage room is discharged into a drying device for drying. After drying, the sludge will clump together. The dried sludge is then sent to a shearing crusher. The shearing crusher can mechanically pre-crush the dried clumps of sludge to eliminate the impact and vibration caused by large clumps of sludge entering the mill. The crushed sludge and coal are sent together to a distributor for distribution. The distributed sludge and coal are then sent together to a drum mixer for mixing. After mixing, the mixture is sent to a coal mill for grinding. The drying unit uses the exhaust gas generated during drying to carry fine sludge powder, which is then captured by a cyclone separator. The captured fine sludge particles are sent back to the feed end of the drying unit. The steam exhaust gas and the odorous gas extracted from the storage room are sent together to the boiler's secondary air for high-temperature decomposition, achieving internal recovery of the dried dust, preventing the escape of fine sludge powder, and reducing material loss.

Claims

1. A method for coupled co-firing of municipal sludge in a 1,000 kW ultra-supercritical power unit, characterized by: The method includes the following steps: (1) The sludge transported by tanker truck is sealed and transported into the storage room. The storage room is deodorized under negative pressure. The sludge in the storage room will be discharged into the drying device for drying. (2) The dried sludge may clump together. The dried sludge is fed into the shearing crusher. The shearing crusher can mechanically pre-crush the dried clump sludge to eliminate the impact vibration caused by large mud clumps entering the mill. (3) The crushed sludge and coal are fed into the distributor for distribution. The distributed sludge and coal are then fed into the drum mixer for mixing. After mixing, the mixture is fed into the coal mill for grinding.

2. The method for coupled co-firing of municipal sludge in a megawatt ultra-supercritical unit according to claim 1, characterized in that: The storage room is connected to the drying device, and the outlet of the drying device is connected to the inlet of the shearing and crushing machine. The feeder has a coal inlet and a sludge inlet, and the outlet of the shear crusher is connected to the inlet of the feeder. The outlet of the feeder is connected to the inlet of the drum mixer, the outlet of the drum mixer is connected to the inlet of the coal mill, and the outlet of the coal mill is connected to the boiler through a pipeline.

3. The method for coupled co-firing of municipal sludge in a megawatt ultra-supercritical unit according to claim 2, characterized in that: The steam outlet of the drying device is connected to the cyclone separator via a pipeline.

4. The method for coupled co-firing of municipal sludge in a megawatt ultra-supercritical unit according to claim 3, characterized in that: The odor outlet of the storage room and the steam outlet of the cyclone separator are connected to the boiler secondary air pipeline through pipelines.

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