A domestic waste incineration fly ash reduction pretreatment pyrolysis gasification reactor

Abstract

The utility model discloses a kind of domestic waste incineration fly ash reduction pretreatment pyrolysis gasification reactor, including the feed inlet ash bin, preheating box, low-temperature thermal decomposition furnace, discharge ash bin in turn, low-temperature thermal decomposition furnace includes steam drying section, thermal decomposition section, discharge section in turn, steam drying section, thermal decomposition section, discharge section are connected to pyrolysis gas exhaust pipe, pyrolysis gas exhaust pipe connects electric bag dust collector, electric bag dust collector is connected with preheating box, preheating box connects condenser, discharge ash bin is equipped with cooling jacket outside, condenser is connected with cooling jacket.The utility model can realize fly ash automatic feeding, heating, drying and then complete cracking, processing temperature is low, energy consumption is low, finally cooling is low-temperature dry ash and is stored conveniently, gas generated by thermal decomposition can be used for fly ash preheating, more energy-saving, can also be sent into condenser to produce condensed water as cooling supplementary water, save processing cost, the entire reactor can improve fly ash processing capacity and processing efficiency, satisfy higher use demand.

Description

Technical Field

[0001] This utility model relates to the field of municipal solid waste incineration fly ash treatment technology, and in particular to a municipal solid waste incineration fly ash reduction pretreatment pyrolysis gasification reactor. Background Technology

[0002] Thermochemical decomposition technology for incineration fly ash is a highly efficient treatment technology for fly ash from waste incineration (containing pollutants such as heavy metals, dioxins, and high salinity). It aims to reduce, neutralize, and recycle fly ash through thermochemical conversion. However, current thermochemical decomposition equipment suffers from high temperatures, high energy consumption, large volumes of waste gas, and high treatment costs, resulting in low fly ash processing capacity and efficiency, which cannot meet current application requirements. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a pyrolysis gasification reactor for reducing fly ash volume in municipal solid waste incineration. It aims to solve the technical problems existing in the current pyrolysis equipment, such as high temperature, high energy consumption, large amount of waste gas generated, high treatment cost, low fly ash treatment volume and treatment efficiency, which cannot meet the needs of use.

[0004] The technical solution of this utility model is: a pyrolysis gasification reactor for reducing fly ash volume in municipal solid waste incineration, comprising a feed ash silo, a preheating box, a low-temperature pyrolysis furnace, and a discharge ash silo connected in sequence. The low-temperature pyrolysis furnace includes a steam drying section, a pyrolysis section, and a discharge section arranged in sequence. The steam drying section, the pyrolysis section, and the discharge section are respectively connected to a pyrolysis gas exhaust pipe. The pyrolysis gas exhaust pipe is connected to an electrostatic precipitator (ESP) bag filter. The ESP bag filter is connected to the preheating box. The preheating box is also connected to a condenser. The discharge ash silo is provided with a cooling jacket on its exterior. The condenser is connected to the cooling jacket.

[0005] Furthermore, the lower part of the feeding ash hopper in this utility model is provided with a first vibrating mechanism, and the bottom of the feeding ash hopper is provided with a feeding ash hopper outlet.

[0006] Furthermore, the preheating box of this utility model is equipped with a first screw conveyor driven by a first motor. The preheating box is provided with a preheating box inlet and a preheating box outlet that are connected to the first screw conveyor. The preheating box inlet is connected to the outlet of the feeding ash hopper.

[0007] Furthermore, the low-temperature pyrolysis furnace described in this utility model is equipped with a second screw conveyor driven by a second motor. The second screw conveyor passes through the steam drying section, the pyrolysis section, and the discharge section. The low-temperature pyrolysis furnace is equipped with a decomposition furnace inlet and a decomposition furnace outlet that are connected to the second screw conveyor. The decomposition furnace inlet is connected to the preheating box outlet.

[0008] Furthermore, the inner walls of the steam drying section, pyrolysis section, and discharge section in this utility model are hollow structures. The steam drying section is connected to a steam inlet and a steam outlet that communicate with its internal hollow structure. The pyrolysis section has a burner installed inside its internal hollow structure and a tail gas exhaust pipe that communicates with its internal hollow structure. A centrifugal fan is installed on the tail gas exhaust pipe.

[0009] Furthermore, the steam drying section, pyrolysis section, and discharge section of this utility model are each provided with a connecting pipe that communicates with the second screw conveyor in their internal hollow structures. The connecting pipes are interconnected and are also connected to the pyrolysis gas discharge pipe.

[0010] Furthermore, the inner wall of the preheating box in this utility model is a hollow structure, the exhaust pipe of the electrostatic precipitator is connected to the hollow structure inside the preheating box, and the preheating box is also connected to an exhaust pipe that is connected to the hollow structure inside it, and the exhaust pipe is connected to the condenser.

[0011] Furthermore, the lower part of the discharge ash hopper in this utility model is provided with a second vibrating mechanism, the top of the discharge ash hopper is provided with a discharge ash hopper inlet and the bottom is provided with a discharge ash hopper outlet, the discharge ash hopper inlet is connected to the discharge outlet of the decomposition furnace; the cooling jacket is provided with a cooling water inlet pipe and a cooling water outlet pipe, and the condensate outlet pipe of the condenser is connected to the cooling water inlet pipe.

[0012] Compared with the prior art, this utility model has the following advantages: This utility model can realize automatic feeding of fly ash, and the low-temperature pyrolysis furnace can heat, dry and then complete the pyrolysis of fly ash. The processing temperature of the pyrolysis section is low and the energy consumption is low. The fly ash after pyrolysis falls into the discharge ash hopper for cooling. The cooled low-temperature dry ash is easier to collect, store and process. The gasified water and waste gas generated in the pyrolysis process are filtered by the electrostatic precipitator and then sent to the preheating box in the front section to preheat the newly arrived fly ash, supplementing the energy consumption required for pyrolysis and making it more energy-efficient. Then it is sent to the condenser, and the condensate produced can be used as supplementary water for fly ash cooling, saving processing costs. The entire reactor can improve the processing capacity and efficiency of fly ash and meet higher usage requirements. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model (where hollow solid arrows indicate the direction of steam flow, solid solid arrows indicate the direction of exhaust gas flow, solid dashed arrows indicate the direction of pyrolysis gas flow, and right-angled arrows indicate the direction of condensate flow).

[0014] The components include: 1. Feed ash hopper; 101. First vibrating mechanism; 102. First vibrating mechanism; 2. Preheating box; 201. First motor; 202. First screw conveyor; 203. Preheating box inlet; 204. Preheating box outlet; 205. Exhaust pipe; 3. Low-temperature pyrolysis furnace; 301. Steam drying section; 301a. Steam inlet; 301b. Steam outlet; 302. Pyrolysis section; 302a. Burner; 302b. Exhaust gas pipe; 302c. Centrifugal fan; 30 3. Discharge section; 304. Pyrolysis gas discharge pipe; 305. Second motor; 306. Second screw conveyor; 307. Decomposition furnace inlet; 308. Decomposition furnace outlet; 309. Connecting pipe; 4. Discharge ash hopper; 401. Second vibrating mechanism; 402. Discharge ash hopper inlet; 403. Discharge ash hopper outlet; 5. Electrostatic precipitator; 501. Gas outlet pipe; 6. Condenser; 601. Condensate outlet pipe; 7. Cooling jacket; 701. Cooling water inlet pipe; 702. Cooling water outlet pipe. Detailed Implementation

[0015] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0016] Example:

[0017] The accompanying drawings illustrate a specific embodiment of the pyrolysis gasification reactor for reducing fly ash volume in municipal solid waste incineration according to this utility model. It mainly includes a feed ash silo 1, a preheating box 2, a low-temperature pyrolysis furnace 3, and a discharge ash silo 4 connected in sequence. The fly ash to be treated is automatically fed through the feed ash silo 1, preheated by the preheating box 2, and then enters the low-temperature pyrolysis furnace 3 for treatment. The treated fly ash falls into the discharge ash silo 4 for cooling.

[0018] The feed ash hopper 1 is equipped with a first vibrating mechanism 101 at the bottom to help the fly ash be discharged quickly, and the feed ash hopper 1 is equipped with a feed ash hopper outlet 102 at the bottom.

[0019] The preheating box 2 is equipped with a first screw conveyor 202 driven by a first motor 201. The preheating box 2 has a preheating box inlet 203 and a preheating box outlet 204 connected to the first screw conveyor 202. The preheating box inlet 203 is connected to the discharge outlet 102 of the feed ash hopper. The fly ash in the discharge outlet 102 of the feed ash hopper falls into the preheating box inlet 203 and is then conveyed to the preheating box outlet 204 by the first screw conveyor 202.

[0020] The low-temperature pyrolysis furnace 3 includes a steam drying section 301, a pyrolysis section 302, and a discharge section 303 arranged sequentially, used for heating, drying, pyrolysis, and discharging fly ash, respectively. A second screw conveyor 306 driven by a second motor 305 is installed inside the low-temperature pyrolysis furnace 3. The second screw conveyor 306 passes through the steam drying section 301, the pyrolysis section 302, and the discharge section 303. The low-temperature pyrolysis furnace 3 has a decomposition furnace inlet 307 and a decomposition furnace outlet 308 connected to the second screw conveyor 306. The decomposition furnace inlet 307 is connected to the preheating box outlet 204. The fly ash in the preheating box outlet 204 falls into the decomposition furnace inlet 307 and is then conveyed to the decomposition furnace outlet 308 by the second screw conveyor 306.

[0021] The inner walls of the steam drying section 301, the pyrolysis section 302, and the discharge section 303 are all hollow structures. The steam drying section 301 is connected to a steam inlet 301a and a steam outlet 301b, which communicate with its internal hollow structure, for introducing steam to preliminarily heat and dry the fly ash. The pyrolysis section 302 has a burner 302a inside its hollow structure, used to raise the temperature and induce a low-temperature pyrolysis reaction in the fly ash. The pyrolysis section 302 is also connected to a tail gas exhaust pipe 302b, which communicates with its internal hollow structure. A centrifugal fan 302c is installed on the tail gas exhaust pipe 302b to discharge the exhaust gas generated during combustion.

[0022] The steam drying section 301, the pyrolysis section 302, and the discharge section 303 are each equipped with a connecting pipe 309 that is connected to the second screw conveyor 306 in their internal hollow structures. The connecting pipes 309 are interconnected and are also connected to the pyrolysis gas discharge pipe 304.

[0023] A pyrolysis gas exhaust pipe 304 is connected to an electrostatic precipitator (ESP) 5, which is connected to a preheating chamber 2. The vaporized water and waste gas generated during the pyrolysis process are filtered by the ESP 5 before being sent to the preheating chamber 2 to preheat the incoming fly ash. Specifically, the preheating chamber 2 has a hollow inner wall. The outlet pipe 501 of the ESP 5 is connected to the hollow inner structure of the preheating chamber 2. An exhaust pipe 205, also connected to the hollow inner structure of the preheating chamber 2, is also connected to the preheating chamber 2. The exhaust pipe 205 is connected to a condenser 6, and the waste gas exiting the preheating chamber 2 is then sent to the condenser 6. The resulting condensate can be used as supplementary water for fly ash cooling.

[0024] Furthermore, a second vibrating mechanism 401 is provided at the lower part of the discharge ash hopper 4 to help the fly ash be discharged quickly. The top of the discharge ash hopper 4 is provided with a discharge ash hopper inlet 402 and the bottom is provided with a discharge ash hopper outlet 403. The discharge ash hopper inlet 402 is connected to the decomposition furnace outlet 308. The fly ash in the decomposition furnace outlet 308 falls into the discharge ash hopper inlet 402 and is collected in the discharge ash hopper 4.

[0025] The outside of the discharge ash hopper 4 is equipped with a cooling jacket 7. The cooling jacket 7 is equipped with a cooling water inlet pipe 701 and a cooling water outlet pipe 702. The condensate outlet pipe 601 of the condenser 6 is connected to the cooling water inlet pipe 701. The condensate generated by the condenser 6 is mixed with the cooling water introduced through the cooling water inlet pipe 701 and then introduced into the cooling jacket 7. After the heat exchange is completed, the cooling water is discharged from the cooling water outlet pipe 702.

[0026] The cooled, low-temperature dry ash in the discharge ash silo 4 is easier to collect, store, and process. After processing, it is discharged through the discharge port 403 of the discharge ash silo.

[0027] Of course, the above embodiments are only for illustrating the technical concept and features of this utility model, and their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All modifications made in accordance with the spirit and essence of the main technical solution of this utility model should be covered within the protection scope of this utility model.

Claims

1. A pyrolysis gasification reactor for pretreatment of fly ash from municipal solid waste incineration, characterized in that: The system includes a feed ash hopper (1), a preheating box (2), a low-temperature pyrolysis furnace (3), and a discharge ash hopper (4) connected in sequence. The low-temperature pyrolysis furnace (3) includes a steam drying section (301), a pyrolysis section (302), and a discharge section (303) arranged in sequence. The steam drying section (301), the pyrolysis section (302), and the discharge section (303) are respectively connected to a pyrolysis gas exhaust pipe (304). The pyrolysis gas exhaust pipe (304) is connected to an electrostatic precipitator (5). The electrostatic precipitator (5) is connected to the preheating box (2). The preheating box (2) is also connected to a condenser (6). The discharge ash hopper (4) is provided with a cooling jacket (7) on its exterior. The condenser (6) is connected to the cooling jacket (7).

2. The pyrolysis gasification reactor for reducing fly ash from municipal solid waste incineration as described in claim 1, characterized in that: The lower part of the feeding ash hopper (1) is provided with a first vibrating mechanism (101), and the bottom of the feeding ash hopper (1) is provided with a feeding ash hopper outlet (102).

3. The pyrolysis gasification reactor for reducing fly ash from municipal solid waste incineration as described in claim 2, characterized in that: The preheating box (2) is equipped with a first screw conveyor (202) driven by a first motor (201). The preheating box (2) is equipped with a preheating box inlet (203) and a preheating box outlet (204) connected to the first screw conveyor (202). The preheating box inlet (203) is connected to the inlet outlet (102) of the feed ash hopper.

4. The pyrolysis gasification reactor for reducing fly ash from municipal solid waste incineration according to claim 3, characterized in that: The low-temperature pyrolysis furnace (3) is equipped with a second screw conveyor (306) driven by a second motor (305). The second screw conveyor (306) passes through the steam drying section (301), the pyrolysis section (302), and the discharge section (303). The low-temperature pyrolysis furnace (3) is equipped with a decomposition furnace inlet (307) and a decomposition furnace outlet (308) connected to the second screw conveyor (306). The decomposition furnace inlet (307) is connected to the preheating box outlet (204).

5. The pyrolysis gasification reactor for reducing fly ash from municipal solid waste incineration as described in claim 4, characterized in that: The inner walls of the steam drying section (301), the pyrolysis section (302), and the discharge section (303) are hollow. The steam drying section (301) is connected to a steam inlet (301a) and a steam outlet (301b) that communicate with its internal hollow structure. The pyrolysis section (302) is equipped with a burner (302a) inside its internal hollow structure. The pyrolysis section (302) is connected to a tail gas exhaust pipe (302b) that communicates with its internal hollow structure. The tail gas exhaust pipe (302b) is equipped with a centrifugal fan (302c).

6. The pyrolysis gasification reactor for reducing fly ash from municipal solid waste incineration according to claim 5, characterized in that: The steam drying section (301), the pyrolysis section (302), and the discharge section (303) are each provided with a connecting pipe (309) that communicates with the second screw conveyor (306) in their hollow internal structures. The connecting pipes (309) are interconnected with each other and are also connected to the pyrolysis gas discharge pipe (304).

7. The pyrolysis gasification reactor for reducing fly ash from municipal solid waste incineration according to claim 6, characterized in that: The inner wall of the preheating box (2) is hollow. The exhaust pipe (501) of the electrostatic precipitator (5) is connected to the hollow structure inside the preheating box (2). The preheating box (2) is also connected to an exhaust pipe (205) that is connected to the hollow structure inside it. The exhaust pipe (205) is connected to the condenser (6).

8. The pyrolysis gasification reactor for reducing fly ash from municipal solid waste incineration according to claim 4, characterized in that: The lower part of the discharge ash hopper (4) is provided with a second vibrating mechanism (401). The top of the discharge ash hopper (4) is provided with a discharge ash hopper inlet (402) and the bottom is provided with a discharge ash hopper outlet (403). The discharge ash hopper inlet (402) is connected to the decomposition furnace outlet (308). The cooling jacket (7) is provided with a cooling water inlet pipe (701) and a cooling water outlet pipe (702). The condensate outlet pipe (601) of the condenser (6) is connected to the cooling water inlet pipe (701).

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