Organic solid waste treatment system and treatment method

Abstract

The present invention discloses an organic solid waste treatment system and treatment method, wherein the treatment system comprises: a pyrolysis reaction unit; an acid gas reduction unit connected to the pyrolysis reaction unit; a resource conversion unit connected to the acid gas reduction unit; and a cleaning unit, one end of which is connected to the acid gas reduction unit and the other end of which is connected to the resource conversion unit. The present invention solves the problem of highly toxic pollutants generated due to the presence of halogen-containing organic matter in the process of recycling organic solid waste resources.

Description

Technical Field

[0001] The invention belongs to the field of solid waste resource treatment, and in particular relates to an organic solid waste treatment system and a treatment method. Background Art

[0002] At present, the annual output of organic solid waste from domestic, agricultural and industrial sources in my country exceeds 6 billion tons, accounting for more than 60% of the total solid waste generation. Due to the relatively complex composition of organic solid waste in my country, including agricultural straw, sludge, kitchen waste, restaurant kitchen waste, Chinese medicine residues, waste tires, etc., there are both resources such as carbon, nitrogen and phosphorus, as well as polluting elements such as heavy metals, which have both resource attributes and pollution attributes, but a scientific and reasonable management and safe disposal technology system has not yet been formed. It can be seen that the resource-based scientific and technological innovation of organic solid waste is an important opportunity and challenge at present. As a rapidly developing method of organic solid waste treatment, the resource-based, harmless and reduced treatment of organic solid waste can reduce the volume of organic solid waste by 90% and the mass by 70%-80%. The heat generated by the incineration of organic solid waste (such as domestic waste) can be used for power generation, which can achieve the purpose of harmless, reduced and resource-based waste treatment, but the halogen-containing organic matter in the organic solid waste will produce dioxins and other highly toxic pollutants that are difficult to decompose. Summary of the invention

[0003] The purpose of the present invention is to provide an organic solid waste treatment system and method, which solves the problem of highly toxic pollutants generated due to the presence of halogen-containing organic matter during the recycling of organic solid waste resources.

[0004] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0005] The present invention provides an organic solid waste treatment system, which comprises:

[0006] Pyrolysis reaction unit;

[0007] an acid gas reduction unit connected to the pyrolysis reaction unit;

[0008] a resource conversion unit connected to the acid gas reduction unit;

[0009] A cleaning unit has one end connected to the acid gas reduction unit and the other end connected to the resource conversion unit.

[0010] In one embodiment of the present invention, the organic solid waste treatment system further comprises a crushing unit, one end of the crushing unit is connected to the cleaning unit, and the other end of the crushing unit is connected to the resource conversion unit.

[0011] In one embodiment of the present invention, the organic solid waste treatment system further comprises a waste mixing unit, and the waste mixing unit is connected to the pyrolysis reaction unit.

[0012] In one embodiment of the present invention, the waste in the waste mixing unit is transported into the pyrolysis reaction unit via a screw feeder.

[0013] In one embodiment of the present invention, the waste mixing unit includes alkaline oxides or alkaline hydroxides. In one embodiment of the present invention, the pyrolysis reaction unit adopts any one of a screw propulsion reactor, a rotary reactor and a drop reactor.

[0014] In one embodiment of the present invention, the organic solid waste treatment system further comprises a heat supply unit, and the heat supply unit is connected to the pyrolysis reaction unit and the acid gas reduction unit.

[0015] In one embodiment of the present invention, the heat supply unit is connected to the resource conversion unit.

[0016] In one embodiment of the present invention, part of the high-temperature flue gas in the heat supply unit flows to the outer wall of the pyrolysis reaction unit and contacts the outer wall of the pyrolysis reaction unit, and the high-temperature gas generated by the combustion of part of the high-temperature flue gas mixed with fuel gas in the heat supply unit flows to the interior of the pyrolysis reaction unit and contacts the organic solid waste.

[0017] The present invention also provides a method for treating organic solid waste, which comprises at least the following steps:

[0018] The organic solid waste is put into a pyrolysis reaction unit to undergo a thermal decomposition reaction to obtain halogen-containing volatile matter and pyrolysis carbon;

[0019] Passing the obtained halogen-containing volatile matter and the pyrolytic carbon into an acid gas reduction unit to obtain halogen-free combustible gas and halogen-containing pyrolytic carbon;

[0020] Passing the halogen-free combustible gas into a resource conversion unit for use;

[0021] Passing the halogen-containing pyrolytic carbon into a cleaning unit to obtain halogen-free pyrolytic carbon;

[0022] The halogen-free pyrolytic carbon is introduced into the resource conversion unit for use.

[0023] The present invention removes halogens in organic solid waste by arranging an acid gas reduction unit and a cleaning unit, thereby solving the problem of highly toxic pollutants generated due to the presence of halogen-containing organic matter during the recycling of organic solid waste resources.

[0024] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0026] Figure 1 is a structural diagram of the organic solid waste treatment system of the present invention;

[0027] Figure 2 for Figure 1 A partial structural diagram of the organic solid waste treatment system;

[0028] Figure 3 for Figure 1 Schematic diagram of the structure of the acid gas reduction unit;

[0029] Figure 4 for Figure 1 The structural diagram of the cleaning unit;

[0030] Figure 5 The present invention is a flow chart of the method for treating organic solid waste. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Organic solid waste includes domestic garbage, sludge, landscaping solid waste, activated carbon powder, waste tires, etc. Resource treatment of organic solid waste can reduce the volume of organic solid waste by 90% and the mass by 70%-80%. my country's energy storage and energy consumption are mainly coal-based, and thermal power generation still accounts for more than 80% of the country's total power generation. Pulverized coal furnaces are high-temperature industrial kilns with large heat capacity and strong anti-interference, which can effectively inhibit the formation of dioxins. At the same time, thermal power plants have a complete flue gas purification system. The use of pulverized coal furnaces to coordinate the disposal of urban organic solid waste can achieve the transformation and utilization of organic solid waste, effectively control the secondary pollution caused by solid waste disposal, and save the cost of solid waste disposal, thereby achieving the purpose of harmlessness, reduction, and resource utilization of organic solid waste. However, combustion pollutants, especially high halogen content, are another problem in coordinated disposal. Compared with the pollutants produced by coal combustion, the halogen pollutants produced by the incineration of domestic waste have a high content. The existing pulverized coal boiler burns garbage together, converts the garbage into volatile matter and pyrolysis semi-coke through pyrolysis, and sends them to the pulverized coal boiler respectively. However, all the pollutants in the domestic waste are brought into the pulverized coal boiler, which brings serious corrosion risks to the heating surface at the rear of the pulverized coal furnace. At the same time, all the tar in the pyrolysis volatile matter is sent to the furnace of the pulverized coal furnace.

[0033] See also Figures 1 to 4 The present invention provides an organic solid waste treatment system, which includes: a waste mixing unit 100, a pyrolysis reaction unit 101, an acid gas reduction unit 103, a resource conversion unit 106, a crushing unit 105, a cleaning unit 104 and a heat supply unit 102. The pyrolysis reaction unit 101 is connected to the waste mixing unit 100, the acid gas reduction unit 103 is connected to the pyrolysis reaction unit 101, the resource conversion unit 106 is connected to the acid gas reduction unit 103, one end of the cleaning unit 104 is connected to the acid gas reduction unit 103, the other end of the cleaning unit 104 is connected to the resource conversion unit 106, one end of the crushing unit 105 is connected to the cleaning unit 104, the other end of the crushing unit 105 is connected to the resource conversion unit 106, and the heat supply unit 102 is connected to the pyrolysis reaction unit 101, the acid gas reduction unit 103 and the resource conversion unit 106.

[0034] See also Figure 1 In some embodiments, the organic solid waste is put into the waste mixing unit 100, and an alkaline oxide or alkaline hydroxide is added thereto for mixing. The alkaline oxide or alkaline hydroxide may be in powder form or in granular form. The alkaline oxide or alkaline hydroxide may be one or more of CaO, MgO, CaOH or MgOH. In the waste mixing unit 100, the organic solid waste is mixed and stirred with the alkaline oxide or alkaline hydroxide, so that the organic solid waste and the alkaline oxide or alkaline hydroxide are fully mixed.

[0035] See also Figure 1 In some embodiments, the organic solid waste mixed with alkaline oxides or alkaline hydroxides can be fed into the pyrolysis reaction unit 101 by a material conveying device. In this embodiment, for example, a screw feeder is used to feed the organic solid waste mixed with alkaline oxides or alkaline hydroxides into the pyrolysis reaction unit 101.

[0036] See also Figure 1 and Figure 2 In some embodiments, the pyrolysis reaction unit 101 can decompose the organic solid waste by heating to obtain usable resources. The operating temperature of the pyrolysis reaction unit 101 is, for example, 480-680°C. In some embodiments, the pyrolysis reaction unit 101 can adopt any one of a screw-propulsion reactor, a rotary reactor or a drop reactor. In the pyrolysis reaction unit 101, the organic solid waste undergoes a thermal decomposition reaction to generate halogen-containing volatiles 1600 and pyrolytic carbon, wherein the halogen-containing volatiles 1600 include non-condensable gases (such as methane, ethane, ethylene, hydrogen, carbon monoxide, etc.) and tar at room temperature, as well as halogen impurities. The halogen impurities will not only generate toxic pollutants in subsequent combustion, but also cause corrosion to subsequent high-temperature equipment, affecting the service life of the later high-temperature equipment in the system.

[0037] See also Figure 1 and Figure 3 In some embodiments, the obtained halogen-containing volatile matter 1600 and the pyrolytic carbon are introduced into the acid gas reduction unit 103 to obtain halogen-free combustible gas 1700 and halogen-containing pyrolytic carbon, and the working temperature of the acid gas reduction unit 103 is, for example, 600-800° C. Specifically, the halogen-containing volatile matter 1600 produced by the pyrolysis reaction unit 101 is, for example, sent to the acid gas reduction unit 103 through an insulated pipeline, and the pyrolytic carbon produced by the pyrolysis reaction unit 101 can be sent to the acid gas reduction unit 103 through a material conveying device, for example, the pyrolytic carbon is sent to the acid gas reduction unit 103 through a screw feeder or a belt transmission device. In the acid gas reduction unit 103, the alkaline oxide or alkaline hydroxide absorbs the halogen in the volatile matter and catalytically cracks all the tar in the volatile matter for reforming and upgrading to obtain the halogen-free combustible gas 1700. In the acid gas reduction unit 103, the pyrolytic carbon can also absorb the halogen impurities in the volatile matter, reform and upgrade the volatile matter, and is also beneficial to obtain the halogen-free combustible gas 1700.

[0038] See also Figure 1 and Figure 2The resource conversion unit 106 may be a high-temperature device. Through the coordinated treatment of the resource conversion unit 106, the available resources obtained after the decomposition of the organic solid waste are converted and utilized. In this embodiment, in the resource conversion unit 106, the halogen-free combustible gas 1700 obtained by the acid gas reduction unit 103 is introduced into the resource conversion unit 106 for resource conversion and utilization. Specifically, in some embodiments, the resource conversion unit 106 may be, for example, a pulverized coal furnace. The halogen-free combustible gas 1700 obtained by the acid gas reduction unit 103 is introduced into the pulverized coal furnace for combustion of pulverized coal in the pulverized coal furnace to generate thermal power. In some embodiments, the pyrolytic carbon that absorbs the halogen impurities in the volatile matter in the acid gas reduction unit 103 is also introduced into the resource conversion unit 106 for resource conversion and utilization. In this embodiment, the pyrolytic carbon containing halogen impurities obtained by the acid gas reduction unit 103 is introduced into the pulverized coal furnace and burned together with the pulverized coal in the pulverized coal furnace for thermal power generation.

[0039] See also Figure 1 , Figure 2 and Figure 3 In some embodiments, the pyrolytic carbon and alkaline oxide or alkaline hydroxide that have absorbed the halogen impurities in the volatile matter in the acid gas reduction unit 103 can be introduced into the cleaning unit 104. The cleaning unit 104 contains a cleaning liquid for cleaning. In this embodiment, the cleaning liquid is, for example, one or more of tap water, purified water or distilled water, or other substances that can dissolve halogens, which is not specifically limited in this application. A screw conveyor can also be provided in the cleaning unit 104. The screw conveyor is driven by a motor 114 to stir and convey the pyrolytic carbon and the cleaning liquid in the cleaning unit 104, so that the halogen impurities in the pyrolytic carbon are cleaned more thoroughly and the cleaned pyrolytic carbon is sent to the carbon outlet 113 of the cleaning unit 104. A partition is provided near the bottom wall of the cleaning unit 104, and a plurality of liquid drainage ports may be provided on the partition. The cleaning liquid is fed into the cleaning unit 104 through the plurality of liquid inlets 110, and the residual liquid after cleaning flows out through the plurality of liquid drainage ports 111 to the liquid outlet 112 on the bottom wall of the cleaning unit 104, and is discharged from the liquid outlet 112. At the same time, the pyrolytic carbon fed from the carbon inlet 115 is discharged from the carbon outlet 113 of the cleaning unit 104 after cleaning.

[0040] See also Figure 1 , Figure 2 and Figure 4In the cleaning unit 104, the pyrolytic carbon containing halogen impurities dissolves the halogen impurities in the cleaning liquid under the action of the cleaning liquid, and then the cleaning liquid with dissolved halogen impurities is discharged from the cleaning unit 104 to obtain halogen-free pyrolytic carbon. In some embodiments, a separation structure is provided in the cleaning unit 104, and the separation structure is used to separate the pyrolytic carbon and wash the cleaning liquid. In this embodiment, more than 90% of the soluble halogen in the pyrolytic carbon is separated, and the separated salt-containing wastewater can be used for recycling in the cleaning unit 104 or for water in the flue gas purification system of the pulverized coal furnace after treatment.

[0041] See also Figure 1 and Figure 2 In some embodiments, the organic solid waste treatment system may further include a crushing unit 105. In some embodiments, the crushing unit 105 may be connected to the acid gas reduction unit 103, and the pyrolytic carbon that has absorbed the halogen impurities in the volatile matter in the acid gas reduction unit 103 is introduced into the crushing unit 105 for crushing, and then the crushed pyrolytic carbon is introduced into the resource conversion unit 106 for use. In some embodiments, the crushing unit 105 may also be connected to the cleaning unit 104, and the halogen-free pyrolytic carbon obtained after cleaning by the cleaning unit 104 is introduced into the crushing unit 105 for crushing, and then the crushed halogen-free pyrolytic carbon is introduced into the resource conversion unit 106 for use. In this embodiment, the crushing unit 105 is, for example, a coal mill, and the pyrolytic carbon is introduced into the coal mill for grinding and crushing, and then the ground and crushed pyrolytic carbon is added to a pulverized coal furnace. The ground and crushed pyrolytic carbon is conducive to the full combustion of the pyrolytic carbon in the pulverized coal furnace. In some embodiments, pulverized coal and pyrolytic carbon can also be added together to the coal mill for grinding and crushing, and the ground and crushed coal powder and pyrolytic carbon mixture is added together to the pulverized coal furnace for combustion for thermal power generation.

[0042] See also Figure 1In some embodiments, the organic solid waste treatment system may further include a heat supply unit 102. In some embodiments, the heat supply unit 102 may be connected to the pyrolysis reaction unit 101 and the acid gas reduction unit 103 to provide heat for the decomposition of the organic solid waste in the pyrolysis reaction unit 101 and to provide heat for the cracking of the tar in the volatile matter in the acid gas reduction unit 103. In some embodiments, the heat supply unit 102 may also be connected to the resource conversion unit 106 at the same time to pass the waste heat generated in the resource conversion unit 106 into the heat supply unit 102, thereby realizing the recycling of heat in the organic solid waste treatment system, which is beneficial to energy conservation. Specifically, in this embodiment, the first high-temperature flue gas 1100 generated in the pulverized coal furnace is sent to the heat supply unit 102 through a vortex fan, and the heat supply unit 102 provides heat to the pyrolysis reaction unit 101 and the acid gas reduction unit 103 respectively. More specifically, the high-temperature airflow output by the heat supply unit 102 is divided into three streams, the first high-temperature airflow 1200 is composed of the high-temperature flue gas of the pulverized coal furnace and the gas combustion airflow 1400, and the second high-temperature airflow 1300 and the third high-temperature airflow 1500 are composed of the high-temperature flue gas of the pulverized coal furnace. The first high-temperature airflow 1200 is passed into the pyrolysis reaction unit 101 to contact the organic solid waste therein and heat the organic solid waste, the second high-temperature airflow 1300 heats the outer wall of the pyrolysis reaction unit 101, and the third high-temperature airflow 1500 heats the acid gas reduction unit 103 to provide heat for the tar decomposition therein. In this embodiment, the heat provided to the pyrolysis reaction unit 101 and the acid gas reduction unit 103 includes three streams of heat. The temperatures of the three high-temperature air flows are respectively a first high-temperature air flow 1200 of 900-1100°C, a second high-temperature air flow 1300 of 700-900°C and a third high-temperature air flow 1500 of 700-900°C. The high-temperature air flow of 900-1100°C is composed of high-temperature flue gas and gas combustion from a pulverized coal furnace, and works on the inner side of the pyrolysis reaction unit 101. The second high-temperature air flow of 700-900°C comes directly from the high-temperature flue gas of the pulverized coal furnace, and works on the outer side of the pyrolysis reaction unit 101. The first high-temperature air flow 1200 and the second high-temperature air flow 1300 are used to maintain the working temperature of the pyrolysis reaction unit 101 at 480-680°C. The third high-temperature air flow of 700-900°C comes directly from the high-temperature flue gas of the pulverized coal furnace, enters from the first air inlet and flows out from the first air outlet, and is used to maintain the working temperature of the acid gas reduction unit 103 at 600-800°C. The high-temperature flue gas in the range of 700-900°C is connected to the pulverized coal furnace furnace and the heat supply unit 102 through a vortex fan, for example.

[0043] See also Figures 1 to 5 The present invention also provides a method for treating organic solid waste, which at least comprises the following steps:

[0044] S1. The organic solid waste is put into the pyrolysis reaction unit 101 to perform a thermal decomposition reaction to obtain halogen-containing volatile matter 1600 and pyrolytic carbon;

[0045] S2. The obtained halogen-containing volatile matter 1600 and the pyrolytic carbon are introduced into the acid gas reduction unit 103 to obtain a halogen-free combustible gas 1700 and a halogen-containing pyrolytic carbon;

[0046] S3. The halogen-free combustible gas 1700 is passed into the resource conversion unit 106 for use;

[0047] S4. The halogen-containing pyrolytic carbon is passed into the cleaning unit 104 to obtain halogen-free pyrolytic carbon;

[0048] S5. Passing the halogen-free pyrolytic carbon into the resource conversion unit 106 for use.

[0049] See also Figures 1 to 5 In step S1, in some embodiments, organic solid waste is put into the waste mixing unit 100, and alkaline oxides or alkaline hydroxides are added thereto for mixing. The alkaline oxides or alkaline hydroxides may be in powder form or in granular form. The alkaline oxides or alkaline hydroxides may be, for example, one or more of CaO, MgO, CaOH or MgOH. In the waste mixing unit 100, the organic solid waste is mixed and stirred with the alkaline oxides or alkaline hydroxides so that the organic solid waste and the alkaline oxides or alkaline hydroxides are fully mixed. In some embodiments, the organic solid waste mixed with the alkaline oxides or alkaline hydroxides may be fed into the pyrolysis reaction unit 101 by a material conveying device. In this embodiment, for example, a screw feeder is used to feed the organic solid waste mixed with the alkaline oxides or alkaline hydroxides into the pyrolysis reaction unit 101. In some embodiments, the pyrolysis reaction unit 101 can decompose the organic solid waste by heating to obtain usable resources. The operating temperature of the pyrolysis reaction unit 101 is, for example, 480-680°C. In some embodiments, the pyrolysis reaction unit 101 can adopt any one of a screw propulsion reactor, a rotary reactor or a drop reactor. In the pyrolysis reaction unit 101, the organic solid waste undergoes a thermal decomposition reaction to generate halogen-containing volatiles 1600 and pyrolytic carbon.

[0050] See also Figures 1 to 5In step S2, step S3 and step S4, in some embodiments, the obtained halogen-containing volatile matter 1600 and the pyrolytic carbon are introduced into the acid gas reduction unit 103 to obtain halogen-free combustible gas 1700 and halogen-containing pyrolytic carbon, and the working temperature of the acid gas reduction unit 103 is, for example, 600-800°C. Specifically, the halogen-containing volatile matter 1600 generated by the pyrolysis reaction unit 101 is, for example, sent to the acid gas reduction unit 103 through an insulated pipeline, and the pyrolytic carbon generated by the pyrolysis reaction unit 101 can be sent to the acid gas reduction unit 103 through a material conveying device, for example, the pyrolytic carbon is sent to the acid gas reduction unit 103 from the first inlet 109 through a screw feeder or a belt transmission device. In the acid gas reduction unit 103, the alkaline oxide or alkaline hydroxide absorbs the halogen in the volatile matter and catalytically cracks all the tar in the volatile matter for reforming and upgrading to obtain the halogen-free combustible gas 1700. An insulation layer 107 can also be provided outside the acid gas reduction unit 103 to keep the acid gas reduction unit 103 warm. In the acid gas reduction unit 103, the pyrolytic carbon can also absorb the halogen impurities in the volatile matter, reform and upgrade the volatile matter, which is also conducive to obtaining the halogen-free combustible gas 1700. The resource conversion unit 106 may be a high-temperature device. Through the coordinated treatment of the resource conversion unit 106, the available resources obtained after the decomposition of the organic solid waste are converted and utilized. In this embodiment, in the resource conversion unit 106, the halogen-free combustible gas 1700 obtained by the acid gas reduction unit 103 is introduced into the resource conversion unit 106 for resource conversion and utilization. Specifically, in some embodiments, the resource conversion unit 106 may be, for example, a pulverized coal furnace. The halogen-free combustible gas 1700 obtained by the acid gas reduction unit 103 is introduced into the pulverized coal furnace for combustion of pulverized coal in the pulverized coal furnace to generate thermal power. In some embodiments, the pyrolytic carbon that absorbs the halogen impurities in the volatile matter in the acid gas reduction unit 103 can be sent out from the first outlet 108, and the pyrolytic carbon containing the halogen impurities and the alkaline oxide or alkaline hydroxide are introduced into the cleaning unit 104. The cleaning unit 104 contains a cleaning liquid for cleaning. In this embodiment, the cleaning liquid is, for example, one or more of tap water, purified water or distilled water, or other substances that can dissolve halogens, which is not specifically limited in the present application. In the cleaning unit 104, the pyrolytic carbon containing halogen impurities dissolves the halogen impurities in the cleaning liquid under the action of the cleaning liquid, and then the cleaning liquid with dissolved halogen impurities is discharged from the cleaning unit 104 to obtain halogen-free pyrolytic carbon. In some embodiments, a separation structure is provided in the cleaning unit 104, and the separation structure is used to separate the pyrolytic carbon and wash the cleaning liquid. In this embodiment, more than 90% of the soluble halogen in the pyrolytic carbon is separated, and the separated salt-containing wastewater can be used for recycling in the cleaning unit 104 or for water in the flue gas purification system of the pulverized coal furnace after treatment.The halogen-free pyrolytic carbon is introduced into the resource conversion unit 106 for utilization.

[0051] See also Figures 1 to 5 The present invention discloses an organic solid waste treatment system and a treatment method. The organic solid waste treatment system of the present invention can realize barrier-free coordinated disposal of organic solid waste in a resource conversion unit 106, such as a coal boiler, without affecting the life of the resource conversion unit 106. For example, it can also achieve final pollutant emission compliance without changing the pulverized coal furnace flue gas purification system. It has the advantages of low investment, low operating failure rate, and reliable coordinated disposal.

[0052] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An organic solid waste treatment system, characterized in that: It comprises: a waste mixing unit (100), a pyrolysis reaction unit (101), an acid gas reduction unit (103), a resource conversion unit (106), a crushing unit (105), a cleaning unit (104) and a heat supply unit (102); The pyrolysis reaction unit (101) is connected to the waste mixing unit (100), the acid gas reduction unit (103) is connected to the pyrolysis reaction unit (101), the resource conversion unit (106) is connected to the acid gas reduction unit (103), one end of the cleaning unit (104) is connected to the acid gas reduction unit (103), the other end of the cleaning unit (104) is connected to the resource conversion unit (106), one end of the crushing unit (105) is connected to the cleaning unit (104), the other end of the crushing unit (105) is connected to the resource conversion unit (106), and the heat supply unit (102) is connected to the pyrolysis reaction unit (101), the acid gas reduction unit (103) and the resource conversion unit (106); The organic solid waste is fed into the waste mixing unit (100), and an alkaline oxide or alkaline hydroxide is added thereto for mixing; the organic solid waste mixed with the alkaline oxide or alkaline hydroxide is fed into the pyrolysis reaction unit (101) through a material conveying device; in the pyrolysis reaction unit (101), the organic solid waste undergoes a thermal decomposition reaction to generate halogen-containing volatile matter (1600) and pyrolytic carbon; the obtained halogen-containing volatile matter (1600) and pyrolytic carbon are introduced into the acid gas reduction unit (103) to obtain a halogen-free combustible gas (101). 700) and halogen-containing pyrolytic carbon; specifically, the halogen-containing volatile matter (1600) generated by the pyrolysis reaction unit (101) is sent to the acid gas reduction unit (103) through an insulated pipeline, and the pyrolytic carbon generated by the pyrolysis reaction unit (101) is sent to the acid gas reduction unit (103) through a material conveying device. In the acid gas reduction unit (103), the alkaline oxide or alkaline hydroxide and the pyrolytic carbon absorb the halogen in the volatile matter and catalytically crack all the tar in the volatile matter for reforming and upgrading, thereby obtaining a halogen-free combustible gas (1700); The resource conversion unit (106) is a pulverized coal furnace, and the halogen-free combustible gas (1700) obtained by the acid gas reduction unit (103) is introduced into the pulverized coal furnace for combustion of pulverized coal in the pulverized coal furnace to generate thermal power; The pyrolytic carbon and alkaline oxide or alkaline hydroxide that have absorbed halogen impurities in volatile matter in the acid gas reduction unit (103) are introduced into the cleaning unit (104); in the cleaning unit (104), the halogen impurities in the pyrolytic carbon are dissolved in the cleaning liquid under the action of the cleaning liquid; the halogen-free pyrolytic carbon obtained after cleaning in the cleaning unit (104) is introduced into the pulverization unit (105) for pulverization; and the pulverized halogen-free pyrolytic carbon is then introduced into the resource conversion unit (106) for utilization; The pulverizing unit (105) is a coal mill, and coal powder and pyrolytic carbon are added to the coal mill for grinding and pulverization. The ground and pulverized coal powder and pyrolytic carbon mixture is added to a coal powder furnace for combustion for thermal power generation; The waste heat generated in the resource conversion unit (106) is introduced into the heat supply unit (102). Specifically, the first high-temperature flue gas (1100) generated in the pulverized coal furnace is sent to the heat supply unit (102) through a vortex fan, and passes through the heat supply unit (102) to provide heat to the pyrolysis reaction unit (101) and the acid gas reduction unit (103). The high-temperature airflow output by the heat supply unit (102) is divided into three streams. The first high-temperature airflow (1200) is composed of a gas combustion airflow (1400) and a gas from the heat supply unit (103). The high-temperature flue gas from the pulverized coal furnace is composed of the second high-temperature airflow (1300) and the third high-temperature airflow (1500); the first high-temperature airflow (1200) is passed into the interior of the pyrolysis reaction unit (101) to contact with the organic solid waste therein to heat the organic solid waste; the second high-temperature airflow (1300) heats the outer wall of the pyrolysis reaction unit (101); and the third high-temperature airflow (1500) heats the acid gas reduction unit (103) to provide heat for the decomposition of tar therein.

2. The organic solid waste treatment system according to claim 1, characterized in that: The waste in the waste mixing unit is transported into the pyrolysis reaction unit through a screw feeder.

3. The organic solid waste treatment system according to claim 1, characterized in that: The pyrolysis reaction unit adopts any one of a screw propulsion reactor, a rotary reactor and a drop reactor.

4. A method for treating organic solid waste using the organic solid waste treatment system according to claim 1, characterized in that: The method comprises the following steps: S1. Putting organic solid waste into a waste mixing unit (100), and adding alkaline oxide or alkaline hydroxide thereto for mixing; in a pyrolysis reaction unit (101), the organic solid waste undergoes a thermal decomposition reaction to obtain halogen-containing volatile matter (1600) and pyrolytic carbon; S2. Passing the obtained halogen-containing volatile matter (1600) and the pyrolytic carbon into an acid gas reduction unit (103) to obtain halogen-free combustible gas (1700) and halogen-containing pyrolytic carbon; S3. The halogen-free combustible gas (1700) is passed into the resource conversion unit (106) for use; S4. passing the halogen-containing pyrolytic carbon into a cleaning unit (104) to obtain halogen-free pyrolytic carbon; passing the halogen-free pyrolytic carbon obtained after cleaning in the cleaning unit (104) into the pulverizing unit (105) for pulverization; S5. The crushed halogen-free pyrolytic carbon is introduced into the resource conversion unit (106) for use.

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