Solid waste pyrolysis gasification comprehensive utilization system

Abstract

The utility model relates to the technical field of solid waste treatment, in particular to a solid waste pyrolysis and gasification comprehensive utilization system. The system comprises a pyrolysis gasification furnace unit, a first combustion unit, a second combustion unit, a drying unit, a waste heat recovery unit, a flue gas suction and purification treatment unit and an automatic control unit, all the process units are connected through pipelines, so that a complete process operation system is formed. According to the solid waste pyrolysis and gasification comprehensive utilization system disclosed by the utility model, for industrial and agricultural wastes (pyrolysis materials) which can be pyrolyzed and gasified to generate combustible gas, a plurality of problems such as drying, pyrolysis and gasification, combustion, waste heat utilization, comprehensive utilization of residues, standard emission of combustion flue gas and the like can be thoroughly solved by only one set of system.

Description

Technical Field

[0001] The utility model relates to the technical field of solid waste treatment, and specifically relates to a solid waste pyrolysis and gasification comprehensive utilization system. Background Art

[0002] At present, a large amount of industrial and agricultural waste containing calorific value is discarded, resulting in a huge waste of energy. Among them, a considerable proportion of waste (hereinafter referred to as pyrolysis material) can be pyrolyzed and gasified into combustible gas, and the generated combustible gas can be used to generate calorific value through combustion. At the same time, industrial production often involves materials that need to be dried by thermal methods, and the process consumes a lot of heat sources. A more common application scenario is that before pyrolysis and gasification, the pyrolysis material needs to consume heat for drying pretreatment. The heat generated by the pyrolysis and gasification of the pyrolysis material can not only meet the pretreatment consumption of the pyrolysis and gasification itself, but also have excess heat that can be recycled.

[0003] The physical and chemical properties of pyrolysis materials vary. Most pyrolysis materials need to be pretreated before pyrolysis and gasification. In addition to the common dehydration and drying, some pyrolysis materials have low calorific value, or too high density and viscosity, which makes the internal gasification channel insufficient, resulting in low pyrolysis efficiency and failure to smoothly and continuously pyrolyze and gasify. Therefore, it is necessary to add certain auxiliary materials before pyrolysis, such as high calorific value materials and loose materials, to improve the pyrolysis and gasification process. At the same time, a considerable part of the residues after pyrolysis and gasification of pyrolysis materials have recycling value, but because the recycling conditions are not completely consistent with the properties of the residues, certain additives need to be added to meet the recycling conditions.

[0004] Moreover, the combustion process of pyrolysis gas will produce flue gas emissions, and the components of the flue gas, such as nitrogen oxides, dust, sulfur dioxide and other pollution indicators, have strict environmental protection requirements. Therefore, the flue gas must be purified and can only be discharged after meeting the standards.

[0005] In view of the requirements of the above-mentioned process flow, there is an urgent need in the art to design an integrated solid waste pyrolysis and gasification comprehensive utilization system. Utility Model Content

[0006] The utility model aims to provide a solid waste pyrolysis and gasification comprehensive utilization system.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A solid waste pyrolysis and gasification comprehensive utilization system, comprising a pyrolysis and gasification furnace unit, a first combustion unit, a second combustion unit, a drying unit, a waste heat recovery unit, a flue gas suction and purification unit, and an automatic control unit;

[0009] The pyrolysis gasification furnace unit comprises a pyrolysis gasification furnace, and the pyrolysis gasification furnace is provided with a sealed feeding device and a sealed cooling slag discharging device;

[0010] The first combustion unit comprises a first combustion chamber, a first burner and a third burner are arranged at the front of the first combustion chamber, a pyrolysis gas blower at the flue gas outlet of the pyrolysis gasification furnace is connected to the inlet of the first burner, the inlet of the first burner is also connected to the primary blower, and the outlet of the first combustion chamber is connected to the flue gas inlet of the pyrolysis gasification furnace through a pipeline;

[0011] The second combustion unit comprises a second combustion chamber, a second burner is arranged at the front of the second combustion chamber, the outlet of the first combustion chamber is connected to the inlet of the second burner through a first valve; the inlet of the second burner is also connected to the secondary air fan;

[0012] The drying unit comprises a surface drying furnace, the front of which is provided with a drying material inlet device, the rear of which is provided with a drying material outlet device, the outer cavity of the surface drying furnace is provided with a smoke inlet and a smoke outlet, the inner cavity is provided with a tail gas outlet, the inner cavity is used to transport the drying material, and heat exchange is performed between the outer cavity and the inner cavity through a metal partition;

[0013] The waste heat recovery unit includes a waste heat recovery device, the outlet of the second combustion chamber is connected to the flue gas inlet of the outer cavity of the surface drying furnace and the inlet of the waste heat recovery device through pipelines; the inlet and outlet of the waste heat recovery device are connected through pipelines, and a fourth valve is provided on the pipeline;

[0014] The flue gas extraction and purification treatment unit comprises a flue gas denitrification and denitration device, the outlet of which is connected to a flue gas dust removal and desulfurization device via a flue gas induced draft fan;

[0015] The flue gas outlet of the outer cavity of the surface drying furnace is connected to the inlet of the flue gas denitrification and denitrification device through a drying fan, a fifth valve is provided on the pipeline between the drying fan and the inlet of the flue gas denitrification and denitrification device, the pipeline between the drying fan and the fifth valve is connected to the flue gas inlet of the outer cavity of the surface drying furnace through a first branch, and a sixth valve is provided on the first branch; the outlet of the waste heat recovery device is connected to the inlet of the flue gas denitrification and denitrification device through a pipeline; the pipeline between the fifth valve and the inlet of the flue gas denitrification and denitrification device is connected to the pipeline between the outlet of the first combustion chamber and the flue gas inlet of the pyrolysis gasification furnace through a second branch, and a circulating fan is provided on the second branch;

[0016] The outlet of the flue gas induced draft fan is also provided with a third branch, and the third branch is connected to the first combustion chamber and the second combustion chamber through pipelines respectively.

[0017] Furthermore, the pyrolysis gasification furnace unit also includes a pyrolysis material feeding and conditioning bin and a slag discharging and conditioning bin.

[0018] Furthermore, the pyrolysis gasification furnace is provided with a pressure gauge and a temperature gauge, and a temperature gauge is provided on the pipeline at the flue gas inlet of the pyrolysis gasification furnace.

[0019] Furthermore, a pressure gauge and a temperature gauge are provided on the first combustion chamber; and a first oxygen meter is provided on the outlet pipeline of the first combustion chamber.

[0020] Furthermore, a second oxygen meter is provided on the outlet pipeline of the second combustion chamber.

[0021] Furthermore, the exhaust gas outlet of the surface drying furnace is connected to the dust removal and dehumidification device through an exhaust fan, a pressure gauge is provided on the outer cavity; a temperature gauge is provided at the rear of the inner cavity; and a temperature gauge is provided on the pipeline of the smoke inlet of the outer cavity.

[0022] Furthermore, a temperature meter is provided on the inlet pipeline of the flue gas denitrification and denitrification device.

[0023] Furthermore, a second valve is provided on the pipeline between the third branch and the first combustion chamber.

[0024] Furthermore, a third valve is provided on the pipeline between the third branch and the second combustion chamber.

[0025] Compared with the prior art, the beneficial effects of the utility model are:

[0026] The solid waste pyrolysis and gasification comprehensive utilization system of the utility model is composed of six process units including a pyrolysis and gasification furnace unit, a first combustion unit, a second combustion unit, a drying unit, a waste heat recovery unit, and a flue gas suction and purification treatment unit, and an automatic control unit. Each process unit is connected by a pipeline to form a complete process operation system. The system is aimed at industrial and agricultural waste (pyrolysis material) that can be pyrolyzed and gasified to produce combustible gas. It only needs one system to completely solve many problems such as drying, pyrolysis and gasification, combustion, waste heat utilization, comprehensive utilization of residues, and emission of combustion flue gas that meets the standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the solid waste pyrolysis and gasification comprehensive utilization system of the utility model.

[0028] Among them, 100-pyrolysis gasification furnace unit, 200-first combustion unit, 300-second combustion unit, 400-drying unit, 500-waste heat recovery unit, 600-smoke suction and purification treatment unit;

[0029] 101-pyrolysis gasification furnace, 102-sealed feeding device, 103-sealed cooling slag discharging device, 104-pyrolysis material feeding quenching and tempering bin, 105-slag discharging quenching and tempering bin;

[0030] 201-first combustion chamber, 202-first burner, 203-pyrolysis gas blower, 204-primary blower, 205-third burner; 206-first oxygen meter, 207-circulation blower, 208-first valve, 209-second valve;

[0031] 301-second combustion chamber, 302-second burner, 303-secondary fan, 304-second oxygen meter, 305-third valve;

[0032] 401- surface drying furnace, 402- drying material inlet device, 403- drying material outlet device, 404- drying fan, 405- exhaust fan, 406- dust removal and dehumidification device, 407- fifth valve, 408- sixth valve;

[0033] 501-waste heat recovery device, 502-fourth valve;

[0034] 601-Flue gas denitrification and denitrification device, 602-Flue gas induced draft fan, 603-Flue gas dust removal and desulfurization device. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] like Figure 1 As shown, a solid waste pyrolysis and gasification comprehensive utilization system includes a pyrolysis and gasification furnace unit 100, a first combustion unit 200, a second combustion unit 300, a drying unit 400, a waste heat recovery unit 500, a flue gas suction and purification treatment unit 600 and an automatic control unit;

[0037] The pyrolysis gasification furnace unit 100 comprises a pyrolysis gasification furnace 101, on which a sealed feeding device 102 and a sealed cooling slag discharging device 103 are provided;

[0038] The first combustion unit 200 includes a first combustion chamber 201, a first burner 202 and a third burner 205 are provided at the front of the first combustion chamber 201, a pyrolysis gas blower 203 at the flue gas outlet of the pyrolysis gasification furnace 101 is connected to the inlet of the first burner 202, the inlet of the first burner 202 is also connected to the primary blower 204, and the outlet of the first combustion chamber 201 is connected to the flue gas inlet of the pyrolysis gasification furnace 101 through a pipeline;

[0039] The second combustion unit 300 includes a second combustion chamber 301, a second burner 302 is provided at the front of the second combustion chamber 301, and the outlet of the first combustion chamber 201 is connected to the inlet of the second burner 302 through the first valve 208; the inlet of the second burner 302 is also connected to the secondary fan 303;

[0040] The drying unit 400 includes a surface drying furnace 401, the front of the surface drying furnace 401 is provided with a drying material inlet device 402, the rear of the surface drying furnace 401 is provided with a drying material outlet device 403, the outer cavity of the surface drying furnace 401 is provided with a smoke inlet and a smoke outlet, the inner cavity is provided with an exhaust gas outlet, the inner cavity is used to transport the drying material, and heat exchange is performed between the outer cavity and the inner cavity through a metal partition;

[0041] The waste heat recovery unit 500 includes a waste heat recovery device 501. The outlet of the second combustion chamber 301 is connected to the flue gas inlet of the outer cavity of the surface drying furnace 401 and the inlet of the waste heat recovery device 501 through pipelines respectively; the inlet and outlet of the waste heat recovery device 501 are connected through pipelines, and a fourth valve 502 is provided on the pipeline;

[0042] The flue gas extraction and purification treatment unit 600 includes a flue gas denitrification and denitration device 601, and the outlet of the flue gas denitrification and denitration device 601 is connected to the flue gas dust removal and desulfurization device 603 through a flue gas induced draft fan 602;

[0043] The flue gas outlet of the outer cavity of the surface drying furnace 401 is connected to the inlet of the flue gas denitrification and denitration device 601 through the drying fan 404, and a fifth valve 407 is provided on the pipeline between the drying fan 404 and the inlet of the flue gas denitrification and denitration device 601. The pipeline between the drying fan 404 and the fifth valve 407 is connected to the flue gas inlet of the outer cavity of the surface drying furnace 401 through a first branch, and a sixth valve 408 is provided on the first branch; the outlet of the waste heat recovery device 501 is connected to the inlet of the flue gas denitrification and denitration device 601 through a pipeline; the pipeline between the fifth valve 407 and the inlet of the flue gas denitrification and denitration device 601 is connected to the pipeline between the outlet of the first combustion chamber 201 and the flue gas inlet of the pyrolysis gasification furnace 101 through a second branch, and a circulating fan 207 is provided on the second branch;

[0044] The outlet of the flue gas induced draft fan 602 is also provided with a third branch, which is connected to the first combustion chamber 201 and the second combustion chamber 301 through pipelines. A second valve 209 is provided on the pipeline between the third branch and the first combustion chamber 201. A third valve 305 is provided on the pipeline between the third branch and the second combustion chamber 301.

[0045] The pyrolysis gasification furnace 101 is provided with a pressure gauge and a temperature gauge, and a temperature gauge is provided on the pipeline of the smoke inlet of the pyrolysis gasification furnace 101. According to actual needs, a pyrolysis material feeding and conditioning bin 104 and a slag conditioning bin 105 can also be added to the pyrolysis gasification furnace unit 100.

[0046] The first combustion chamber 201 is provided with a pressure gauge and a temperature gauge; the outlet pipeline of the first combustion chamber 201 is provided with a first oxygen meter 206 .

[0047] A second oxygen meter 304 is provided on the outlet pipeline of the second combustion chamber 301 .

[0048] The tail gas outlet of the surface drying furnace 401 is connected to the dust removal and dehumidification device 406 through the exhaust fan 405. A pressure gauge is provided on the outer cavity; a temperature gauge is provided at the rear of the inner cavity; and a temperature gauge is provided on the pipeline of the smoke inlet of the outer cavity.

[0049] The waste heat recovery device 501 is a waste heat steam boiler, a waste heat thermal oil boiler or a gas-to-gas heat exchanger.

[0050] A temperature meter is provided on the inlet pipeline of the flue gas denitrification and denitration device 601. The outlet of the flue gas dust removal and desulfurization device 603 is connected to the chimney.

[0051] The automatic control unit includes power supply (gas) equipment and control software and hardware equipment based on PLC or DCS, which are used to control various detection instruments and various automatic (electric or pneumatic) valves.

[0052] The working principle of the solid waste pyrolysis and gasification comprehensive utilization system is as follows:

[0053] (1) The pyrolysis material stored in the pyrolysis material feeding and conditioning bin 104 enters the pyrolysis gasification furnace 101 through the sealed feeding device 102, is mixed with the high-temperature flue gas in the pyrolysis gasification furnace 101, and is pyrolyzed and gasified in a certain temperature range under the condition of isolation from oxygen, so that part of the solid matter in the pyrolysis material is pyrolyzed and gasified into combustible gas. The sealed feeding device 102 has the function of adjusting the feeding amount and isolating from the atmosphere, which can ensure that the pyrolysis material is pyrolyzed and gasified in an oxygen-deficient environment without combustion. The heat source required for pyrolysis and gasification comes from the high-temperature flue gas transported by the first combustion unit 200 through the pipeline. The combustible gas generated by pyrolysis and gasification is transported to the first combustion unit 200 through the pipeline for combustion to generate high-temperature flue gas. The slag formed after the pyrolysis and gasification of the pyrolysis material has no calorific value but has a high temperature, and is discharged from the pyrolysis gasification furnace 101 through the sealed cooling slag discharge device 103. The sealed cooling slag discharge device 103 has the functions of slag discharge, cooling the slag (generally using water cooling), and isolating from the atmosphere. A pressure gauge is provided on the main body of the pyrolysis gasification furnace 101, and a thermometer is provided at the high-temperature flue gas inlet of the pyrolysis gasification furnace 101. The pressure and temperature in the pyrolysis gasification furnace 101 are adjusted by the first combustion unit 200 to ensure that the pyrolysis furnace operates under the allowable operating temperature and pressure conditions. By controlling the residence time of the pyrolysis material in the furnace body and the temperature of the slag outlet, the pyrolysis and gasification of the pyrolysis material can be fully achieved.

[0054] (2) The pyrolysis gas blower 203 with frequency conversion regulation function sucks the combustible gas produced by the pyrolysis gasification furnace 101 and blows it into the first burner 202. The primary blower 204 with frequency conversion regulation sucks oxygen from the atmosphere, mixes it with the combustible gas in the first burner 202, ignites it, and burns it in the first combustion chamber 201 to produce high-temperature flue gas. The frequency of the pyrolysis gas blower 203 is adjusted to adjust the amount of combustible gas sucked, and the opening of the first valve 208 is adjusted to control the pressure in the first combustion chamber 201 and the pyrolysis gasification furnace 101 to be within the allowable range. The high-temperature flue gas is mixed with the low-temperature flue gas after cooling from the waste heat recovery unit 500 and the drying unit 400 sucked by the circulation fan 207, and the flue gas temperature entering the pyrolysis gasification furnace 101 is adjusted to be within the allowable range, so that the pyrolysis gasification furnace 101 can operate within the allowable temperature range. The air volume of the primary fan 204 is adjusted by the first oxygen meter 206 at the outlet of the first combustion chamber 201 for oxygen content, that is, the first oxygen meter 206 should not contain oxygen, so as to ensure stable combustion in the first combustion chamber 201, and to ensure that the flue gas at the appropriate temperature entering the pyrolysis gasification furnace 101 does not contain excessive oxygen, so as not to cause no combustion in the pyrolysis gasification furnace 101 during pyrolysis and gasification. The first combustion chamber 201 also introduces a certain amount of low-temperature flue gas through the second valve 209 for recycling flue gas to achieve low-nitrogen combustion in the first combustion chamber 201 and meet the requirements of low-nitrogen emissions. The first combustion chamber 201 is also provided with a third burner 205, which generally uses natural gas as a raw material. When the pyrolysis gasification furnace 101 is started or the heat of the pyrolysis combustible gas combustion is insufficient, heat is supplemented until the transition to the combustible gas generated by pyrolysis can support the continuous process of pyrolysis-combustion of the pyrolysis material. The first combustion chamber 201 and the pyrolysis gasification furnace 101 generally operate at normal pressure or slightly positive pressure.

[0055] (3) Due to the multiple effects of the exhaust fan 602 sucking, the primary fan 204 blowing into the atmosphere, and the combustion of combustible gas in the first combustion chamber 201, the pressure of the second combustion chamber 301 is lower than that of the first combustion chamber 201, and the high-temperature flue gas generated in the first combustion chamber 201 naturally enters the second combustion chamber 301 through the first valve 208. Since the air volume of the primary fan 204 is controlled by the first oxygen meter 206, the combustible gas is in an oxygen-deficient combustion state in the first combustion chamber 201, and the flue gas in the inlet of the second combustion chamber 301 still contains unburned combustible gas, which is supplemented with oxygen in the atmosphere by the secondary fan 303, mixed and ignited in the second burner 302, and burned in the second combustion chamber 301. The air volume of the secondary fan 303 is controlled by the oxygen content of the second oxygen meter 304 at the outlet of the second combustion chamber 302 to ensure that there is a slight excess of oxygen in the second combustion chamber 302, so as to ensure that the combustible gas in the second combustion chamber 302 can be fully burned and utilized. The second combustion chamber 302 also introduces a certain amount of low-temperature flue gas through the third flue gas recirculation valve 305 to achieve low-nitrogen combustion in the second combustion chamber 301 and meet the low-nitrogen emission requirements of flue gas. The second combustion chamber 301 is generally operated at a slight negative pressure.

[0056] (4) The high-temperature flue gas generated in the second combustion chamber 301 enters the drying unit 400 and the waste heat recovery unit 500 through the pipeline due to the suction effect of the flue gas induced draft fan 602. The amount of flue gas entering the drying unit 400 and the waste heat recovery unit 500 is distributed and adjusted by the air volume of the drying fan 404 controlled by the frequency conversion of the flue gas outlet of the drying unit 400 and the opening degree of the fifth valve 407 of the flue gas outlet of the drying fan 404.

[0057] (5) The waste heat recovery device 501 of the waste heat recovery unit 500 is generally a waste heat steam boiler, a waste heat thermal oil boiler, an air-to-air heat exchanger, etc., which can recover the waste heat in the flue gas entering the waste heat recovery device 501, and supply heat to the outside with steam, thermal oil or hot air as the medium to achieve waste heat recovery. The waste heat recovery device 501 is provided with a fourth bypass valve 502, the opening of which is used to adjust the temperature entering the flue gas treatment unit to meet the temperature required for flue gas denitrification treatment.

[0058] (6) The surface drying furnace 401 of the drying unit 400 is used to remove moisture from the drying material, and its temperature is relatively low. The drying material is not in direct contact with the flue gas as a heat source, and heat exchange is carried out through a metal partition. The flue gas is directly cooled by heat exchange through an independent channel and then sucked into the subsequent unit by the drying fan 404. The exhaust fan 405 sucks in the atmosphere, which is mixed with the drying material through the drying material layer and heated. When the atmosphere exceeds the evaporation point of water, the moisture in the drying material is heated and taken away as water vapor for discharge. The exhaust fan 405 sucks in a steam and gas mixture that has passed through the drying material, which contains a small amount of dust, has a low temperature, and a small air volume. It only needs to undergo a simple dust removal process to meet the discharge standards. By adjusting the air volume of the drying fan 404, the residence time of the drying material in the drying furnace, and the discharge temperature of the drying furnace (a drying material humidity meter can also be installed), it can be ensured that the drying material is fully dried. The high-temperature flue gas entering the drying furnace is mixed with a certain amount of low-temperature flue gas from the outlet of the drying fan 404 through the opening of the sixth valve 408, the fifth valve 407 and the inlet flue gas temperature meter to control the drying process of the surface drying furnace 401 to operate within the allowable drying temperature range.

[0059] (7) The flue gas induced draft fan 602 provides the kinetic energy for the whole system to extract the flue gas. The flue gas denitrification and denitrification device 601 removes excessive nitrogen oxides. The flue gas dust removal and desulfurization device 603 removes excessive dust and sulfides. After the flue gas meets the emission standard, it is discharged to the atmosphere through the chimney. The flue gas inlet and outlet temperature of the flue gas induced draft fan 602 is much lower than that of the first and second combustion chambers, and the pressure is higher than that of the first and second combustion chambers. It contains only a trace amount of oxygen. A part of the flue gas is refluxed to the first and second combustion chambers, which can realize low-nitrogen combustion in the first and second combustion chambers. The flue gas reflux volume can be adjusted by adjusting the opening of the second valve 209 and the third valve 305. The flue gas induced draft fan 602 is variable frequency regulated, and its frequency is controlled according to the pressure gauge in the second combustion chamber 301, which is generally a slight negative pressure.

[0060] All temperatures, pressures, frequencies, etc. are operated through automatic control units to achieve fully automated operation.

[0061] Application Examples

[0062] The following takes the comprehensive disposal of municipal sludge as an example to demonstrate the application and operation process of this system.

[0063] Municipal sludge has the characteristics of high water content and high viscosity; the absolutely dry sludge after drying has a high calorific value and can be gasified to produce combustible gas, and can be directly used as a pyrolysis material for pyrolysis and gasification; the absolutely dry sludge has a high specific gravity and requires the addition of auxiliary materials such as sawdust to ensure smooth and continuous pyrolysis and gasification; the residue after pyrolysis and gasification can be used as carbon fertilizer and potash fertilizer. After adding a certain amount of other fertilizer ingredients, it is a high-quality flower planting soil and can also be used to improve the soil.

[0064] The specific application process is as follows:

[0065] (1) Fill the drying furnace with a portion of sludge and the waste heat recovery device with heat medium to complete the preparation work. The supplementary gas (natural gas) is ignited through the third burner and burned in the first combustion chamber to produce high-temperature flue gas without excess oxygen. At the same time, the pyrolysis gas fan, circulation fan, drying fan, and flue gas exhaust fan are operated at a low frequency; adjust the frequency and valve opening of each fan to achieve the reading of the first oxygen meter and the second oxygen meter without oxygen, and turn on the secondary fan to achieve full combustion of the supplementary gas in the second combustion chamber to complete the "initial ignition".

[0066] (2) Adjust the frequency of the flue gas induced draft fan and the opening of the first valve to maintain normal pressure or slightly positive pressure in the first combustion chamber and slightly negative pressure in the second combustion chamber; adjust the drying fan to the maximum operating condition, adjust the fifth valve and the sixth valve to ensure that the flue gas inlet temperature of the outer cavity of the surface drying furnace is within the allowable range, until the drying unit operates normally and produces absolutely dry sludge that meets the moisture content requirements; at the same time, adjust the frequency of the pyrolysis gas fan and the circulation fan to maintain the temperature in the pyrolysis gasification furnace slightly lower than the temperature required for sludge gasification.

[0067] (3) The absolutely dry sludge is discharged and transported to the pyrolysis material feeding and conditioning bin, and auxiliary materials such as sawdust are added, stirred evenly, and gradually fed into the pyrolysis gasification furnace.

[0068] (4) Observe the combustion conditions in the first combustion chamber, confirm that combustible gas is output from the first burner outlet and has been ignited, and that the first combustion chamber is burning stably. During this process, it should be noted that the oxygen content of the first oxygen meter and the second oxygen meter gradually decreases.

[0069] (5) When there is no excess oxygen on the first oxygen meter and the oxygen content reading on the second oxygen meter is lower than the set value, start the secondary fan and gradually increase the frequency until the content on the second oxygen meter reaches the set value.

[0070] (6) Gradually reduce the supplementary gas of the third burner until it is completely withdrawn, completing the entire "ignition" process and entering normal operation.

[0071] (7) During or after the ignition process, the sludge residue generated in the slag discharge bin is added with necessary additives, such as phosphate fertilizer, according to the needs of comprehensive utilization to achieve comprehensive utilization.

[0072] (8) Before ignition and in the initial stage of ignition, the fourth bypass valve of the waste heat recovery device is in a fully open state. During the ignition process or after ignition, when the inlet temperature of the flue gas denitrification and denitrification device reaches the set value, the fourth valve is gradually closed and the waste heat recovery device is gradually put into use until the waste heat is utilized and external heat is supplied.

[0073] (9) From the start of ignition, the exhaust gas purification and flue gas purification systems are in operation to ensure that the exhaust and flue gas meet emission standards throughout the entire process.

[0074] (10) Observe the temperature, pressure, and oxygen content at any time, and adjust the frequency of each fan and the opening of the valve to achieve continuous and stable operation of the entire system.

[0075] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A solid waste pyrolysis and gasification comprehensive utilization system, characterized by: It comprises a pyrolysis gasification furnace unit (100), a first combustion unit (200), a second combustion unit (300), a drying unit (400), a waste heat recovery unit (500), a flue gas suction and purification treatment unit (600), and an automatic control unit; The pyrolysis gasification furnace unit (100) comprises a pyrolysis gasification furnace (101), and the pyrolysis gasification furnace (101) is provided with a sealed feeding device (102) and a sealed cooling slag discharge device (103); The first combustion unit (200) comprises a first combustion chamber (201), a first burner (202) and a third burner (205) are arranged at the front of the first combustion chamber (201), a pyrolysis gas blower (203) at the flue gas outlet of the pyrolysis gasification furnace (101) is connected to the inlet of the first burner (202), the inlet of the first burner (202) is also connected to the primary blower (204), and the outlet of the first combustion chamber (201) is connected to the flue gas inlet of the pyrolysis gasification furnace (101) through a pipeline; The second combustion unit (300) comprises a second combustion chamber (301), a second burner (302) is provided at the front of the second combustion chamber (301), the outlet of the first combustion chamber (201) is connected to the inlet of the second burner (302) via a first valve (208); the inlet of the second burner (302) is also connected to a secondary air fan (303); The drying unit (400) comprises a surface drying furnace (401), the front of the surface drying furnace (401) is provided with a drying material inlet device (402), the rear of the surface drying furnace (401) is provided with a drying material outlet device (403), the outer cavity of the surface drying furnace (401) is provided with a smoke inlet and a smoke outlet, the inner cavity is provided with an exhaust gas outlet, the inner cavity is used to transport the drying material, and heat exchange is performed between the outer cavity and the inner cavity via a metal partition; The waste heat recovery unit (500) comprises a waste heat recovery device (501), the outlet of the second combustion chamber (301) is respectively connected to the smoke inlet of the outer cavity of the surface drying furnace (401) and the inlet of the waste heat recovery device (501) through pipelines; the inlet and outlet of the waste heat recovery device (501) are connected through a pipeline, and a fourth valve (502) is provided on the pipeline; The flue gas extraction and purification treatment unit (600) comprises a flue gas denitrification and denitration device (601), and the outlet of the flue gas denitrification and denitration device (601) is connected to a flue gas dust removal and desulfurization device (603) via a flue gas induced draft fan (602); The flue gas outlet of the outer cavity of the surface drying furnace (401) is connected to the inlet of the flue gas denitrification and denitration device (601) through a drying fan (404); a fifth valve (407) is provided on the pipeline between the drying fan (404) and the inlet of the flue gas denitrification and denitration device (601); the pipeline between the drying fan (404) and the fifth valve (407) is connected to the flue gas inlet of the outer cavity of the surface drying furnace (401) through a first branch; a sixth valve (408) is provided on the first branch; the outlet of the waste heat recovery device (501) is connected to the inlet of the flue gas denitrification and denitration device (601) through a pipeline; the pipeline between the fifth valve (407) and the inlet of the flue gas denitrification and denitration device (601) is connected to the pipeline between the outlet of the first combustion chamber (201) and the flue gas inlet of the pyrolysis gasification furnace (101) through a second branch; a circulating fan (207) is provided on the second branch; The outlet of the flue gas induced draft fan (602) is also provided with a third branch, and the third branch is connected to the first combustion chamber (201) and the second combustion chamber (301) through pipelines respectively.

2. The solid waste pyrolysis and gasification comprehensive utilization system according to claim 1 is characterized in that: The pyrolysis gasification furnace unit (100) further comprises a pyrolysis material feeding and conditioning bin (104) and a slag discharging and conditioning bin (105).

3. The solid waste pyrolysis and gasification comprehensive utilization system according to claim 1, characterized in that: The pyrolysis gasification furnace (101) is provided with a pressure gauge and a temperature gauge, and a temperature gauge is provided on a pipeline at a flue gas inlet of the pyrolysis gasification furnace (101).

4. The solid waste pyrolysis and gasification comprehensive utilization system according to claim 1, characterized in that: The first combustion chamber (201) is provided with a pressure gauge and a temperature gauge; and the outlet pipeline of the first combustion chamber (201) is provided with a first oxygen meter (206).

5. The solid waste pyrolysis and gasification comprehensive utilization system according to claim 1, characterized in that: A second oxygen meter (304) is provided on the outlet pipeline of the second combustion chamber (301).

6. The solid waste pyrolysis and gasification comprehensive utilization system according to claim 1, characterized in that: The tail gas outlet of the surface drying furnace (401) is connected to the dust removal and dehumidification device (406) through an exhaust fan (405); a pressure gauge is provided on the outer cavity; a temperature gauge is provided at the rear of the inner cavity; and a temperature gauge is provided on the pipeline of the smoke inlet of the outer cavity.

7. The solid waste pyrolysis and gasification comprehensive utilization system according to claim 1, characterized in that: A temperature meter is provided on the inlet pipeline of the flue gas denitrification and denitration device (601).

8. The solid waste pyrolysis and gasification comprehensive utilization system according to claim 1, characterized in that: A second valve (209) is provided on the pipeline between the third branch and the first combustion chamber (201).

9. The solid waste pyrolysis and gasification comprehensive utilization system according to claim 1, characterized in that: A third valve (305) is provided on the pipeline between the third branch and the second combustion chamber (301).

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