A heat circulation structure and a sludge co-combustion structure for a coal-fired power plant

Abstract

The present invention provides a heat circulation structure and a sludge co-combustion structure of a coal-fired power plant, comprising: a heat drying device, wherein the heat drying device is connected with a sludge incineration device through a high-temperature flue gas conveying pipeline, the heat drying device is connected with a fluidizing device through a fan, the fluidizing device is provided with a discharge port, the fluidizing device is connected with the sludge incineration device through the discharge port, the sludge incineration device is used to incinerate sludge to generate high-temperature flue gas, the high-temperature flue gas is transported into the heat drying device through the high-temperature flue gas conveying pipeline to provide heat for sludge drying, the heat in the heat drying device is transmitted to the fluidizing device to provide heat for fluidizing the dried sludge, thus forming a heat circulation among the heat drying device, the fluidizing device and the sludge incineration device; the problem of high energy consumption of sludge co-combustion in the boiler of the fluidizing device is solved, and the production cost is saved.

Description

Technical Field

[0001] The invention relates to the technical field of sludge blending and burning processing, and in particular to a heat circulation structure and a sludge blending and burning structure of a coal-fired power plant. Background Art

[0002] Sludge has a high moisture content and contains a large number of pathogens, parasite eggs, and heavy metal toxic and harmful substances such as chromium and mercury. It is complex in nature and high in pollutant content. It is a pollutant with huge potential environmental risks. How to digest this part of sludge has become an important issue in cities. "A sludge blending system for thermal power plants" (application number: CN110590115A) proposes to treat sludge by sending the dried sludge into the furnace for combustion based on a fan mill. It is simple, convenient and practical, but it is mainly for units with fan mills.

[0003] How to achieve rational allocation of resources while alleviating the problems caused by sludge is a difficult problem that researchers urgently need to solve. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a heat circulation structure and a sludge co-combustion structure for a coal-fired power plant, which solves the problem of high energy consumption of sludge co-combustion in a fluidized bed boiler and saves production costs.

[0005] In order to achieve the above object, the technical solution of the present invention is as follows:

[0006] The present invention provides a heat circulation structure, comprising: a heat drying device, wherein the heat drying device is connected with a sludge incineration device through a high-temperature flue gas conveying pipeline, the heat drying device is connected with a fluidizing device through a fan, the fluidizing device is provided with a discharge port, the fluidizing device is connected with the sludge incineration device through the discharge port, the sludge incineration device is used to incinerate sludge to generate high-temperature flue gas, the high-temperature flue gas is transported into the heat drying device through the high-temperature flue gas conveying pipeline to provide heat for sludge drying, the heat in the heat drying device is transmitted to the fluidizing device to provide heat for the fluidization of the dried sludge, and a heat circulation is formed among the heat drying device, the fluidizing device and the sludge incineration device.

[0007] The invention provides a heat circulation structure and a sludge co-combustion structure for a coal-fired power plant, which solves the problem of high energy consumption in the sludge co-combustion of a fluidized bed boiler and saves production costs.

[0008] As a preferred technical solution, a washing tower is connected between the thermal drying equipment and the fan, and the washing tower is used to wash the high-temperature flue gas transmitted into the fluidized bed.

[0009] As a preferred technical solution, a coal mill is provided between the thermal drying equipment and the fluidizing equipment, and a second feeder is provided between the coal mill and the fluidizing equipment.

[0010] The present invention also provides a sludge co-combustion structure for a coal-fired power plant, comprising: a sludge filter press structure and a heat circulation structure as described in any one of the above items, wherein the heat circulation structure is connected to the sludge filter press structure.

[0011] As a preferred technical solution, the sludge filter press structure includes: a filter press device, a second feeder, a conditioning device and a sludge temporary storage tank. One end of the filter press device is connected to the first feeder through a filter press sludge transmission pipeline, the first feeder is connected to a thermal drying device, the other end of the filter press device is connected to the conditioning device, and the conditioning device is connected to the sludge temporary storage tank.

[0012] As a preferred technical solution, the conditioning equipment includes: a conditioning tank, the conditioning tank is connected to a wastewater tank and a plunger pump, and the conditioning equipment is used to condition the sludge output from the sludge temporary storage tank to modify it.

[0013] As a preferred technical solution, the filter press sludge transmission pipeline is connected to a distributor, and the distributor is connected to a mesh filter press for separating mud and water in the sludge.

[0014] As an optimal technical solution, it includes: a waste gas treatment structure, the heat circulation structure is connected to the waste gas treatment structure, the waste gas treatment structure includes: an ash pump, an ash bin and a dust collector, the sludge incineration equipment is connected to the ash bin through the ash pump, and the ash bin is connected to the dust collector.

[0015] As a preferred technical solution, the exhaust gas treatment structure further includes: a desulfurization tower, and the dust collector is connected to the desulfurization tower through a flue.

[0016] As a preferred technical solution, the sludge incineration equipment is connected to a supplementary coal burning equipment.

[0017] The present invention provides a heat circulation structure and a sludge co-combustion structure for a coal-fired power plant. The sludge can be initially dehydrated to a moisture content of 60% by means of a filter press device, and the sludge can reach a standard moisture content for spontaneous combustion, thereby saving a large amount of cost for subsequent sludge drying. The heat is greatly recycled through the internal circulation of heat among the thermal drying device, the fluidized bed device and the sludge incineration device, thereby further saving production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG1 is a flow chart of a sludge co-combustion structure of a coal-fired power plant provided by the present invention.

[0019] Among them: 1-sludge temporary storage tank; 2-filter press equipment; 201-feeder; 202-mesh filter press; 3-thermal drying equipment; 401-first feeder; 402-second feeder; 501-first fan; 502-second fan; 6-coal mill; 7-fluidizing equipment; 701-cyclone separator; 702-drying box; 8-sludge incineration equipment; 9-conditioning tank; 10-wastewater tank; 11-piston pump; 12-washing tower; 13-ash pump; 1401-dust collector; 1402-desulfurization tower; 15-ash silo; 16-supplementary coal equipment. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] It can be understood that the present invention is to achieve the purpose of the present invention through some embodiments. As shown in FIG1 , the present invention provides a sludge co-combustion structure of a coal-fired power plant, including: a sludge temporary storage tank 1, the sludge temporary storage tank 1 is connected to a filter press 2 through a conditioning tank 9, the conditioning equipment includes: a conditioning tank 9, the conditioning tank 9 is connected to a wastewater tank 10 and a plunger pump 11, the conditioning equipment 2 is used to modulate the sludge output from the sludge temporary storage tank 1 to modify it, the wastewater tank 10 is used to discharge a part of the garbage material in the sludge that cannot be burned into the wastewater tank 11, and the plunger pump 11 is used to provide pressure to the filter press 2, which can prevent the filter press from burning. 2 is not enough to cause blockage. The filter press equipment 2 is connected to the first feeder 401 through a filter press sludge transmission pipeline. The filter press sludge transmission pipeline is connected to a distributor 201. The distributor 201 is connected to a mesh filter press 202. The sludge enters the distributor 201 through the sludge transmission pipeline. The distributor 201 distributes the sludge on the mesh of the mesh filter press 202. The mesh filter press 202 is provided with two meshes arranged oppositely. The sludge is wrapped by the meshes arranged oppositely and the water in the sludge is pressed out by the roller on the mesh filter press 202, so that the sludge is initially dehydrated. The sludge is initially dehydrated so that the water content of the sludge reaches 60%;

[0022] The first feeder 401 is connected to the thermal drying device 3, and the thermal drying device 3 is connected to the sludge incineration device 8 through a high-temperature flue gas conveying pipeline. The thermal drying device 3 is connected to the fluidization device 7 through the first fan 501. The first fan 501 transfers the heat in the thermal drying device to the fluidization device to provide heat for the fluidization of the dried sludge, so as to facilitate the use of the hot gas of the thermal drying device to fluidize the sludge. A washing tower 12 is connected between the thermal drying device 3 and the first fan 501. The washing tower 12 is used In order to wash the high-temperature flue gas before being transmitted to the fluidizing device 7, a coal mill 6 is provided between the thermal drying device 3 and the fluidizing device 7, and a second feeder 402 is provided between the coal mill 6 and the fluidizing device 7. The dried sludge is ground by the coal mill 6, and the ground sludge is transported to the fluidizing device 7 by the second feeder 402. The sludge in the filter press device 2 is transported to the fluidizing device 7 by the first feeder 401 and the second feeder 402. The whole process is automatically operated. The cost of manpower and vehicles for transportation is saved. A discharge port is provided on the fluidizing device 7. The fluidizing device 7 is connected with the sludge incineration device 8 through the discharge port, and is used to directly transfer the dried sludge to the sludge incineration device 8 for incineration, which can reduce heat loss and save production costs. The sludge incineration device 8 is used to incinerate sludge to generate high-temperature flue gas. The high-temperature flue gas is transported into the thermal drying device 3 through the high-temperature flue gas conveying pipeline to provide heat for sludge drying. The heat in the thermal drying device 3 is transferred to the fluidizing device 7 through the first fan 501 to provide heat for fluidization of the dried sludge, forming a heat cycle between the thermal drying device 3, the fluidizing device 7 and the sludge incineration device 8. The fluidizing device 7 is also connected with a cyclone separator 701, and the cyclone separator 701 is connected with a dry material box 702 through a pipeline. The fluidizing device 7 can separate the sludge particles from the gas through the cyclone separator 701, and store a part of the sludge particles in the dry material box 702 for subsequent use.

[0023] The sludge incineration equipment 8 is connected to an ash bin 15 through an ash pump 13. When the sludge incineration equipment 8 is incinerating sludge, a large amount of smoke dust will be generated, and the exhaust gas treatment structure needs to be used to treat the smoke dust. Further, the ash pump 13 is used to collect a large amount of smoke dust generated when the sludge incineration equipment 8 is incinerated into the ash bin 15, which can be used as a building material later to maximize the utilization rate of the sludge. The ash bin 15 is connected to a dust collector, and the dust collector is connected to a desulfurization tower 1402 through a bypass flue. The dust collector and A second fan 502 is connected between the desulfurization tower 1402. The second fan 502 is used to transport the dust-removed flue gas into the desulfurization tower 1402 for desulfurization treatment. The desulfurization tower 1402 is provided with a chimney. The gas after desulfurization treatment is discharged into the atmosphere through the chimney. The waste gas discharged after the sludge is burned contains a high concentration of sulfides. The waste gas is dust-removed and desulfurized by the dust collector 1401 and the desulfurization tower 1402 so that it can be discharged after meeting the emission standards to protect the environment.

[0024] The sludge incineration equipment 8 is connected to a supplementary coal-fired equipment 16, which is used to add coal to the sludge incineration equipment. When the sludge is incinerated, a part of the sludge does not meet the moisture content standard and the incineration calorific value is insufficient. The supplementary coal-fired equipment 16 is used to add combustion-supporting materials to the sludge incineration equipment so that the incineration calorific value of the sludge incineration equipment always meets the standard.

[0025] The filter press equipment can filter the sludge with a water content of 80% to 90% to a water content of 60% to 70%. The sludge with a water content of 60% to 70% can produce 800kca l / kg calorific value, reaches the standard water content of spontaneous combustion, greatly reduces the cost of drying sludge, the sludge after filtration is transported to the thermal drying equipment 3 through the filtration sludge transmission pipeline for drying, the water content of the dried sludge reaches 30% to 40%, and then the dried sludge is ground by the coal mill 6, and the ground sludge is transported to the fluidizing equipment 7 through the second feeder 402, and the high-temperature gas generated in the thermal drying equipment 3 is transported into the fluidizing equipment 7 through the first fan 501 to further dry the sludge, and finally the sludge will enter the sludge incineration equipment 8 for incineration, and the high-temperature heat generated by the incineration of the sludge incineration equipment 8 will be transmitted to the thermal drying equipment 3 through the high-temperature flue gas transmission pipeline, forming a heat cycle between the thermal drying equipment 3, the fluidizing equipment 7 and the sludge incineration equipment 8, further saving energy costs.

[0026] The sludge incineration equipment 8 is preferably a boiler.

[0027] The fluidizing device 7 is preferably a fluidized bed.

[0028] The temperature of the high-temperature flue gas is 200-400°C.

[0029] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all various changes or equivalent substitutions falling within the scope of the claims of the present application are included. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are within the scope protected by the present invention.

Claims

1. A sludge co-combustion structure for a coal-fired power plant, characterized in that: include: A sludge filter pressing structure, a heat circulation structure and a waste gas treatment structure, wherein the heat circulation structure comprises: a heat drying device (3), wherein the heat drying device (3) is connected to a sludge incineration device (8) via a high-temperature flue gas conveying pipeline, wherein the heat drying device (3) is connected to a fluidizing device (7) via a fan, wherein the fluidizing device (7) is provided with a discharge port, wherein the fluidizing device (7) is connected to the sludge incineration device (8) via the discharge port, wherein the sludge incineration device (8) is used to incinerate sludge to generate high-temperature flue gas, wherein the high-temperature flue gas is discharged through a sludge incineration device (8) The high-temperature flue gas is transported into the thermal drying device (3) through a conveying pipeline to provide heat for sludge drying, and the heat in the thermal drying device (3) is transferred to the fluidizing device (7) to provide heat for the fluidization of the dried sludge, thereby forming a heat cycle between the thermal drying device (3), the fluidizing device (7) and the sludge incineration device (8). A washing tower (12) is connected between the thermal drying device (3) and the first fan (501), and the washing tower (12) is used to wash the high-temperature flue gas transmitted to the fluidizing device (7). washing; a coal mill (6) is provided between the thermal drying device (3) and the fluidizing device (7); a second feeder (402) is provided between the coal mill (6) and the fluidizing device (7); the heat circulation structure is connected to the sludge filter press structure, the sludge filter press structure comprising: a filter press device (2), a first feeder (401), a conditioning device and a sludge temporary storage tank (1); one end of the filter press device (2) is connected to the first feeder (401) via a filter press sludge transmission pipeline; The first feeder (401) is connected to the thermal drying equipment (3), the other end of the filter press equipment (2) is connected to the conditioning equipment, the conditioning equipment is connected to the sludge temporary storage tank (1), the heat circulation structure is connected to the exhaust gas treatment structure, the exhaust gas treatment structure includes: an ash pump (13), an ash bin (15) and a dust collector (1401), the sludge incineration equipment (8) is connected to the ash bin (15) through the ash pump (13), and the ash bin (15) is connected to the dust collector (1401).

2. The sludge co-combustion structure of a coal-fired power plant according to claim 1, characterized in that: The conditioning equipment comprises a conditioning tank (9), the conditioning tank (9) is connected to a wastewater tank (10) and a plunger pump (11), and the conditioning equipment is used to condition the sludge output from the sludge temporary storage tank to modify the sludge.

3. The sludge co-combustion structure of a coal-fired power plant according to claim 2, characterized in that: The filter press sludge transmission pipeline is connected to a distributor (201), and the distributor (201) is connected to a mesh filter press (202) for separating mud and water in the sludge.

4. The sludge co-combustion structure of a coal-fired power plant according to claim 1, characterized in that: The exhaust gas treatment structure further includes: a desulfurization tower (1402), and the dust collector (1401) is connected to the desulfurization tower (1402) through a flue.

5. The sludge co-combustion structure of a coal-fired power plant according to claim 1, characterized in that: The sludge incineration equipment (8) is connected to a supplementary coal burning equipment (16).

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