A domestic waste gasification treatment system with chlorine removal function

Abstract

The present invention relates to a domestic waste gasification treatment system with a chlorine removal function, which includes a gasification furnace and a chlorine removal system. It is characterized in that the chlorine removal system includes a fine chlorine filtration device and a coarse chlorine filtration device. The coarse chlorine filtration device includes a plurality of filter plates arranged from top to bottom in the gasification furnace. One end of the filter plate is connected to the gasification furnace, and the upper surface of the filter plate is inclined downward from the fixed end to the free end. The filter plates in the gasification furnace are combined into a filter plate group. The present invention provides a domestic waste gasification treatment system with a chlorine removal function, which directly and deeply removes chlorine from the combustible gas after the combustible gas is generated in the gasification furnace, avoids high-temperature corrosion of subsequent equipment by the combustible gas, thereby improving the steam parameters and power generation efficiency, and helps to reduce the low-temperature heterogeneous catalytic synthesis of dioxin during the flue gas cooling process.

Description

Technical Field

[0001] The present invention relates to a domestic waste gasification treatment system, and particularly to a domestic waste gasification treatment system with a chlorine removal function. Background Art

[0002] The treatment and disposal of domestic waste and other waste is a major problem that China urgently needs to solve. Among them, the waste incineration power generation technology has the advantages of high harmlessness degree, remarkable volume reduction and weight reduction effects, energy recovery and utilization, etc., and has been developed and applied relatively rapidly in recent years. However, secondary pollutants will inevitably be generated during the incineration of domestic waste, especially chlorine-containing pollutants such as dioxins and hydrogen chloride (HCl), which cause great harm to the environment and human health. On the one hand, the chlorine content in domestic waste mainly forms HCl after incineration, and its content in the waste incineration flue gas can reach 800 - 1800 mg / Nm 3 , which is one of the main causes of acid rain. And because HCl is easy to cause high-temperature corrosion of equipment, it limits the steam parameters of waste incineration power generation (generally not higher than 400 o °C, 4 MPa), resulting in a power generation efficiency of only about 20%, far lower than that of coal-fired power plants. On the other hand, HCl in the incineration flue gas plays a key role in the formation of dioxins directly or indirectly during the flue gas cooling process. Therefore, solving the problem of emission control of chlorine-containing pollutants and the like is the key point and difficulty in the current development of waste incineration technology.

[0003] The "two-step" waste incineration technology based on domestic waste pyrolysis gasification - combustible gas combustion has outstanding advantages in reducing pollution emissions and improving power generation efficiency. The product of waste pyrolysis gasification is combustible gas, which can be pre-treated by purification such as dechlorination and then burned for utilization, so as to reduce the content of HCl in the incineration flue gas, reduce the low-temperature heterogeneous catalytic synthesis of dioxins during the flue gas cooling process, and effectively solve the problem that traditional waste incineration can only remove pollutants through low-temperature tail gas purification devices. And because the removal of HCl in the combustible gas can solve the problem of corrosion of the heating surface of the flue gas after incineration, the subsequent power generation system can select high steam parameters (such as 540 o °C, 12 MPa), significantly improving the power generation efficiency. However, only using the post-dechlorination technology of medium and high-temperature combustible gas furnaces has problems such as low efficiency, large amount of dechlorination agent used, and high dechlorination cost. To sum up, it is necessary to develop a system and method for removing chlorine-containing pollutants during the domestic waste pyrolysis gasification process, and combine the pyrolysis gasification reaction characteristics and technical advantages to achieve deep dechlorination of combustible gas. Summary of the Invention

[0004] The present invention mainly solves the technical problems existing in the prior art, such as only being able to remove HCl through a low-temperature tail gas purification device, which easily causes high-temperature corrosion of equipment, thereby restricting the steam parameters of waste incineration power generation, resulting in a low power generation rate, and easily directly or indirectly causing the formation of dioxins during the flue gas cooling process. The present invention provides a domestic waste gasification treatment system with a chlorine removal function, which directly and deeply dechlorinates the combustible gas after the combustible gas is generated in the gasifier, avoids high-temperature corrosion of the subsequent equipment by the combustible gas, thereby improving the steam parameters and power generation efficiency, and helps to reduce the low-temperature heterogeneous catalytic synthesis of dioxins during the flue gas cooling process.

[0005] To solve the above technical problems and achieve the above invention object, the present invention provides a domestic waste gasification treatment system with a chlorine removal function, including a gasifier and a chlorine removal system. The chlorine removal system includes a chlorine fine filtration device and a chlorine rough filtration device. The chlorine rough filtration device includes several filter plates arranged from top to bottom in the gasifier. One end of the filter plate is connected to the gasifier, and the upper surface of the filter plate is inclined downward from the fixed end to the free end. The filter plates in the gasifier form a filter plate group. The filter plate group includes a single-effect filter plate for filtering solid particles and a multi-effect filter table for filtering solid particles and chlorine-containing pollutants. The gasifier includes a gasification reaction layer and a filtration layer for placing the chlorine rough filtration device. The filtration layer is arranged at the top of the gasification reaction layer, and the gasification reaction layer is provided with a calcium injection port.

[0006] As an optimization of the domestic waste gasification treatment system with a chlorine removal function of the present invention, the chlorine fine filtration device is arranged outside the gasifier. The chlorine fine filtration device is a fine filtration bin with a dechlorination agent, and the fine filtration bin is connected to the gas outlet of the gasifier.

[0007] As an optimization of the domestic waste gasification treatment system with a chlorine removal function of the present invention, the single-effect filter plate and the multi-effect filter table are arranged alternately from left to right in sequence from bottom to top in the gasifier to form an arcuate baffle area. The two adjacent single-effect filter plates and the multi-effect filter table above and below form a single filtration cycle, and several filtration cycles are arranged in the gasifier.

[0008] As an optimization of the domestic waste gasification treatment system with a chlorine removal function of the present invention, the single-effect filter plate is a flat filter plate. The single-effect filter plate is rotationally connected to the gasifier through a rotating device. The rotating device includes a rotating shaft connected to the single-effect filter plate and a rotating motor, and the rotating motor is connected to the rotating shaft.

[0009] As an optimization of the domestic waste gasification treatment system with chlorine removal function of the present invention, the multi-effect filtration table includes a frustum-shaped structure housing with a feed port opened on one side facing the gasification furnace and a coarse filtration chamber. A coarse filtration chamber for performing coarse filtration of HCl is provided inside the housing. Filtering windows for ventilation are opened on both the upper and lower surfaces of the housing. A replacement port adapted to the coarse filtration chamber and corresponding to the feed port is provided on the gasification furnace. The coarse filtration chamber is detachably connected to the gasification furnace.

[0010] As an optimization of the domestic waste gasification treatment system with chlorine removal function of the present invention, the multi-effect filtration table includes a filtration surface inclined downward from the fixed end to the free end facing the gas outlet of the gasification furnace and a diversion surface inclined upward from the fixed end to the free end facing the gasification reaction layer. The diversion surface faces the bottom of the adjacent single-effect filter plate.

[0011] As an optimization of the domestic waste gasification treatment system with chlorine removal function of the present invention, both the single-effect filter plate and the filtration surface of the multi-effect filtration table form an angle of 30° - 70° with the horizontal plane, and the diversion surface of the multi-effect filtration table is arranged parallel to the single-effect filter plate.

[0012] As an optimization of the domestic waste gasification treatment system with chlorine removal function of the present invention, the longitudinal orthographic projections of the single-effect filter plate and the multi-effect filtration table do not intersect.

[0013] As an optimization of the domestic waste gasification treatment system with chlorine removal function of the present invention, the coarse filtration chamber includes a filtration main body adapted to the housing and a fixing plate. The fixing plate is detachably connected to the filtration main body. The fixing plate is detachably connected to the gasification furnace through a locking device. The filtration main body is longitudinally densely provided with filtration holes. The dechlorination agent after fine filtration is provided in the coarse filtration chamber.

[0014] As an optimization of the domestic waste gasification treatment system with chlorine removal function of the present invention, a calcium injection conduit is connected to the calcium injection port, and the calcium injection conduit is inclined downward.

[0015] Compared with the prior art, the domestic waste gasification treatment system with chlorine removal function of the present invention has the following beneficial effects:

[0016] 1. Preheat the gasifier. When the temperature of the gasifier reaches 500°C, the gasification medium first enters the gasifier through the air distribution plate. Then, the dried domestic waste is crushed and fed into the gasifier by the feeding device, so that the gasification medium and the domestic waste are quickly mixed to generate a large amount of heat, and incomplete reactions occur to produce crude gasification gas. The reaction temperature is controlled at 750°C. The important components in the crude gasification gas are CO, CO2, H2, CH4, HCl, H2O and solid particles. Calcium is sprayed into the furnace through the calcium spraying port to remove chlorine. After calcium spraying for chlorine removal of domestic waste, due to the existence of the gasification medium, the calcium-based dechlorination agent rises continuously with the crude gasification gas. When it encounters the single-effect filter plate and multi-effect filter platform arranged obliquely downward from the fixed end to the free end, the solid particles and calcium-based dechlorination agent in the upward crude gasification gas are precipitated and roughly removed, preventing the solid particles and calcium-based dechlorination agent in the crude gasification gas from continuing to rise, thus preparing for the filtration of HCl by the multi-effect filter platform. Because before filtering the chlorine in the crude gasification gas, the solid particles in the crude gasification gas must be filtered first, otherwise the solid particles are very likely to block the dechlorination agent, reducing the dechlorination efficiency and increasing the consumption of the dechlorination agent. After the precipitation of the calcium-based dechlorination agent, it flows back to the gasification reaction layer to form secondary dechlorination in the furnace. After the gasification reaction is completed, the solid particles and calcium-based dechlorination agent are discharged together with the gasification bottom slag. After the rough removal of the crude gasification gas by precipitation, part of the crude gasification gas enters the multi-effect filter platform to roughly filter the chlorine in the crude gasification gas and finely filter the solid particles in the crude gasification gas, thus preparing for the HCl fine filtration of the chlorine fine filtration device. In this way, through multiple cycle filtrations of the single-effect filter plate and multi-effect filter platform, a countercurrent filtration in the gasifier is formed, enhancing the filtration time and further improving the filtration effect, thereby achieving the rough filtration of chlorine in the crude gasification gas, and leading the crude gasification gas that has achieved chlorine rough filtration to the chlorine fine filtration device for composite filtration, thus achieving deep dechlorination of the combustible gas, avoiding high-temperature corrosion of the subsequent equipment by the combustible gas, improving the power generation efficiency, and reducing the low-temperature heterogeneous catalytic synthesis of dioxin during the flue gas cooling process;

[0017] 2. The function of setting the chlorine fine filtration device outside the gasifier is to avoid the high temperature in the furnace for chlorine removal, thus achieving medium-high temperature dechlorination of the crude gasification gas (the medium-high temperature dechlorination technology refers to the technology of using a solid-phase dechlorination agent to absorb HCl gas in the crude gasification gas within the temperature range greater than 500°C to finally achieve the separation and removal of chlorine-containing pollutants in the flue gas), avoiding the reduction of the device's chlorine removal effect due to the too high temperature in the gasifier, and improving the filtration efficiency of the chlorine fine filtration device;

[0018] 3. The single-effect filter plate and the multi-effect filter table are arranged alternately left and right from bottom to top in the gasifier to form an arcuate baffle area. The two adjacent single-effect filter plates and multi-effect filter tables, one above the other, form a single filtration cycle. The function of arranging several filtration cycles in the gasifier is to first precipitate and roughly remove the solid particles in the raw gasification gas through the single-effect filter plate before the chlorine rough filtration of the raw coal, so as to reduce the content of solid particles in the raw gasification gas and prepare for the chlorine rough filtration of the raw gasification gas by the multi-effect filter table. Then, part of the raw gasification gas enters the multi-effect filter table to roughly filter the chlorine in the raw gasification gas and finely filter the solid particles in the raw gasification gas. Through the cyclic filtration of multiple filtration cycles in this way, the rough filtration of the raw gasification gas is achieved;

[0019] 4. The single-effect filter plate is rotationally connected to the gasifier through a rotating device. The function is to periodically remove the accumulated impurities on the single-effect filter plate by the rotation of the rotating device;

[0020] 5. The multi-effect filter table includes a frustum-shaped structure housing with a feed port on the side facing the gasifier and a rough filtration chamber. The rough filtration chamber for HCl rough filtration is provided inside the housing. Filter windows for ventilation are opened on both the upper and lower surfaces of the housing. A replacement port adapted to the rough filtration chamber and corresponding to the feed port is provided on the gasifier. The detachable connection between the rough filtration chamber and the gasifier enables the rough filtration chamber to be replaceable. The raw gasification gas enters the rough filtration chamber through the filter window to achieve fine filtration of solid particles and rough filtration of chlorine. When the dechlorination agent in the rough filtration chamber is saturated, the rough filtration chamber is taken out of the housing through the corresponding feed port and replacement port, and the dechlorination agent in the rough filtration chamber is replaced. After putting the rough filtration chamber back, the replaceable use of the dechlorination agent is realized;

[0021] 6. The multi-effect filter table includes a diversion surface and a filter surface that is inclined downward from the fixed end to the free end on the side of the gas outlet facing the gasifier. The function is that the accumulated impurities will fall due to gravity. During the multi-cycle filtration in the gasifier, when the single-effect filter plate is inclined downward from the fixed end to the free end, the flow dead zone on the shell side of one side of the single-effect filter plate is increased. Therefore, the diversion surface is inclined towards the bottom of the single-effect filter plate adjacent to the multi-effect filter table where the diversion surface is located. The function is to divert the raw gasification gas to the bottom of the single-effect filter plate, reduce the flow dead zone on the back of the single-effect filter plate, effectively utilize the space of the gasifier, and make the single-effect filter plate more effective in precipitating and roughly removing solid particles;

[0022] 7. The diversion surface of the multi-effect filter table is arranged parallel to the single-effect filter plate. The function is to make more raw gasification gas effectively diverted to the bottom of the single-effect filter plate;

[0023] 8. The longitudinal orthographic projection of the single-effect filter plate and the multi-effect filter table do not intersect, avoiding local blockage of the coarse gasified gas between the single-effect filter plate and the multi-effect filter table, thus affecting the filtration effect;

[0024] 9. The coarse filtration chamber includes a filter main body adapted to the housing and a fixing plate. The fixing plate is detachably connected to the filter main body, and the fixing plate is detachably connected to the gasifier through a locking device. The filter main body is longitudinally densely provided with filter holes. After the coarse gasified gas passes through the single-effect filter plate for coarse filtration of solid particles, it enters the dechlorination agent through the filter holes to achieve filtration of solid particles and HCl. When the dechlorination agent in the coarse filtration chamber is saturated, the coarse filtration chamber is taken out of the housing because the fixing plate is detachably connected to the gasifier through the locking device, and the dechlorination agent is taken out of the coarse filtration chamber by the detachable connection between the fixing plate and the filter main body to realize the replacement of the dechlorination agent. A fine filtration chamber is provided in the coarse filtration chamber. The function of the dechlorination agent for fine filtration of the used dechlorination agent is that after the coarse gasified gas filtered by the chlorine coarse filtration device has almost no solid particles and the chlorine content is also greatly reduced. Therefore, after the coarse gasified gas passes through the fine filtration chamber, the dechlorination agent in the fine filtration chamber can still filter a large amount of solid particles and an appropriate amount of HCl, which is very suitable for use in the fine filtration chamber. The composite utilization of the dechlorination agent reduces the usage amount of the dechlorination agent and lowers the dechlorination cost;

[0025] 10. The calcium injection port is connected with a calcium injection conduit, and the calcium injection conduit is inclined downward so that the dechlorination agent can be effectively sprayed on the garbage, further reducing the chlorine content in the coarse gasified gas.

[0026] Therefore, the present invention has the characteristics of reasonable structure, high efficiency and energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Attached Figure 1 is a schematic diagram of the flow of a kind of coarse gasified gas of the present invention;

[0028] Attached Figure 2 is a schematic structural diagram of the present invention;

[0029] Attached Figure 3 is a front view of the present invention when the coarse filtration chamber is closed;

[0030] Attached Figure 4 is a top view of the present invention when the coarse filtration chamber is in a certain state;

[0031] Attached Figure 5 is a front view of the present invention when the coarse filtration chamber is opened;

[0032] Attached Figure 6 is a front view of the housing of the present invention;

[0033] Attached Figure 7 is a top view of the housing of the present invention.

[0034] Component number description in the figure: 1. Fixed end, 2. Free end, 3. Single-effect filter plate, 4. Gasification reaction layer, 5. Filter layer, 6. Calcium injection port, 7. Dechlorination agent, 8. Fine filtration chamber, 9. Gas outlet, 10. Rotating shaft, 11. Gasifier, 12. Feed port, 13. Housing, 14. Filter window, 15. Replacement port, 16. Flow guiding surface, 17. Filter surface, 18. Filter main body, 20. Fixed plate, 21. Filter hole, 22. Calcium injection conduit, 23. Multi-effect filtration table. Specific implementation mode

[0035] The technical solution of the present invention will be further specifically described below through embodiments in conjunction with the accompanying drawings.

[0036] Embodiment 1:

[0037] According to Figures 1 to 2 A domestic waste gasification treatment system with a chlorine removal function as shown, including a gasifier 11 and a chlorine removal system, characterized in that the chlorine removal system includes a chlorine fine filtration device and a chlorine coarse filtration device, the chlorine coarse filtration device includes a plurality of filter plates arranged from top to bottom in the gasifier 11, one end of the filter plate is connected to the gasifier 11, the upper surface of the filter plate is inclined downward from the fixed end 1 to the free end 2, the filter plates in the gasifier 11 are combined into a filter plate group, the filter plate group includes a single-effect filter plate 3 for filtering solid particles and a multi-effect filtration table 23 for filtering solid particles and chlorine-containing pollutants, the gasifier 11 includes a gasification reaction layer 4 and a filter layer 5 for placing the chlorine coarse filtration device, the filter layer 5 is arranged at the top of the gasification reaction layer 4, and the gasification reaction layer 4 is provided with a calcium injection port 6.

[0038] Preheat the gasifier 11. When the temperature of the gasifier 11 reaches 500 °C, the gasification medium first enters the gasifier 11 through the air distribution plate. Then, the dried domestic waste is crushed and fed into the gasifier 11 by the feeding device, so that the gasification medium and the domestic waste are quickly mixed to generate a large amount of heat, and an incomplete reaction produces raw gasification gas, and the reaction temperature is controlled at 750 °C. The important components in the raw gasification gas are CO, CO2, H2, CH4, HCl, H2O and solid particles. Calcium is sprayed into the furnace through the calcium spraying port 6 to remove chlorine. After spraying calcium to remove chlorine from the domestic waste, due to the presence of the gasification medium, the calcium-based dechlorination agent 7 rises continuously with the raw gasification gas and meets the single-effect filter plate 3 and the multi-effect filter table arranged obliquely downward from the fixed end 1 to the free end 2. The solid particles and the calcium-based dechlorination agent 7 in the rising raw gasification gas are precipitated and roughly removed, avoiding the continuous rise of the solid particles and the calcium-based dechlorination agent 7 in the raw gasification gas, thus preparing for the filtration of HCl by the multi-effect filter table 23. Because before filtering the chlorine in the raw gasification gas, it is necessary to filter the solid particles in the raw gasification gas. Otherwise, the solid particles are extremely likely to block the dechlorination agent 7, thereby reducing the dechlorination efficiency and increasing the usage amount of the dechlorination agent 7. After the precipitation of the calcium-based dechlorination agent 7, it flows back to the gasification reaction layer 4 to form secondary dechlorination in the furnace. And after the gasification reaction is completed, the solid particles and the calcium-based dechlorination agent 7 are discharged together with the gasification bottom slag. After the raw gasification gas is roughly removed by precipitation, part of the raw gasification gas enters the multi-effect filter table 23 to roughly filter the chlorine in the raw gasification gas and finely filter the solid particles in the raw gasification gas, thus preparing for the fine filtration of HCl by the chlorine fine filtration device. In this way, through multiple cycle filtrations of the single-effect filter plate 3 and the multi-effect filter table 23, a cross-flow filtration in the gasifier 11 is formed, thereby enhancing the filtration time and further improving the filtration effect, so as to achieve the rough filtration of chlorine in the raw gasification gas, and the raw gasification gas that has achieved chlorine rough filtration is led to the chlorine fine filtration device for composite filtration, so as to achieve the deep dechlorination of the combustible gas, avoid the high-temperature corrosion of the subsequent equipment by the combustible gas, improve the power generation efficiency, and reduce the low-temperature heterogeneous catalytic synthesis of dioxin during the flue gas cooling process.

[0039] Example 2:

[0040] According to Figures 1 to 2 As shown, the difference between this embodiment and Embodiment 1 is that the chlorine fine filtration device is arranged outside the gasifier 11. The chlorine fine filtration device is a fine filtration bin 8 with a dechlorination agent 7, and the fine filtration bin 8 is connected to the gas outlet 9 of the gasifier 11.

[0041] Compared with Embodiment 1, this embodiment further defines the chlorine refined filter device. The function of arranging the chlorine refined filter device outside the gasifier 11 is to avoid the high temperature inside the furnace for chlorine removal, so as to achieve medium-high temperature chlorine removal of the raw gasified gas (the medium-high temperature chlorine removal technology refers to the technology of using the solid-phase chlorine removal agent 7 to absorb HCl gas in the raw gasified gas within the temperature range greater than 500°C to finally realize the separation and removal of chlorine-containing pollutants in the flue gas), avoiding the reduction of the chlorine removal effect of the device due to the too high temperature inside the gasifier 11, so as to improve the filtration efficiency of the chlorine refined filter device.

[0042] Embodiment 3:

[0043] According to Figures 1 to 2 As shown, the difference between this embodiment and Embodiment 1 is that the single-effect filter plate 3 and the multi-effect filter table 23 are arranged alternately left and right from bottom to top in the gasifier 11 to form an arcuate baffle area. The two adjacent single-effect filter plates 3 and multi-effect filter tables 23 from bottom to top form a single filtration cycle, and several filtration cycles are provided in the gasifier 11.

[0044] Compared with Embodiment 1, this embodiment further defines the single-effect filter plate 3 and the multi-effect filter table 23. The single-effect filter plate 3 and the multi-effect filter table 23 are arranged alternately left and right from bottom to top in the gasifier 11 to form an arcuate baffle area. The two adjacent single-effect filter plates 3 and multi-effect filter tables 23 from bottom to top form a single filtration cycle. The function of providing several filtration cycles in the gasifier 11 is to first precipitate and roughly remove solid particles in the raw gasified gas through the single-effect filter plate 3 before the rough chlorine filtration of the raw coal, so as to reduce the content of solid particles in the raw gasified gas and prepare for the rough chlorine filtration of the raw gasified gas by the multi-effect filter table 23. Then part of the raw gasified gas enters the multi-effect filter table 23 to roughly filter the chlorine in the raw gasified gas and finely filter the solid particles in the raw gasified gas. In this way, through the cyclic filtration of multiple filtration cycles, the rough filtration of the raw gasified gas is realized.

[0045] Embodiment 4:

[0046] According to Figures 1 to 2 As shown, the difference between this embodiment and Embodiment 1 is that the single-effect filter plate 3 is a flat filter plate, and the single-effect filter plate 3 is rotationally connected to the gasifier 11 through a rotating device. The rotating device includes a rotating shaft 10 connected to the single-effect filter plate 3 and a rotating motor, and the rotating motor is connected to the rotating shaft 10.

[0047] Compared with Embodiment 1, this embodiment further defines the single-effect filter plate 3. The function of rotationally connecting the single-effect filter plate 3 to the gasifier 11 through a rotating device is to periodically remove the impurities accumulated on the single-effect filter plate 3 through the rotation of the rotating device.

[0048] Example 5:

[0049] According to Figures 1 to 7 As shown, the difference between this embodiment and Embodiment 1 is that the multi-effect filtration table 23 includes a frustum-shaped structure housing 13 with a feed inlet 12 opened on one side facing the gasifier 11 and a coarse filtration chamber. A coarse filtration chamber for performing coarse filtration of HCl is provided inside the housing 13. Filtering windows 14 for air permeability are opened on both the upper and lower surfaces of the housing 13. A replacement port 15 adapted to the coarse filtration chamber and corresponding to the feed inlet 12 is provided on the gasifier 11. The coarse filtration chamber is detachably connected to the gasifier 11.

[0050] Compared with Embodiment 1, this embodiment further defines the multi-effect filtration table 23. The multi-effect filtration table 23 includes a frustum-shaped structure housing 13 with a feed inlet 12 opened on one side facing the gasifier 11 and a coarse filtration chamber. A coarse filtration chamber for performing coarse filtration of HCl is provided inside the housing 13. Filtering windows 14 for air permeability are opened on both the upper and lower surfaces of the housing 13. A replacement port 15 adapted to the coarse filtration chamber and corresponding to the feed inlet 12 is provided on the gasifier 11. The detachable connection between the coarse filtration chamber and the gasifier 11 enables the coarse filtration chamber to be replaceable. The raw gasification gas enters the coarse filtration chamber through the filtering window 14 to achieve fine filtration of solid particles and coarse filtration of chlorine. When the dechlorination agent 7 in the coarse filtration chamber is saturated, the coarse filtration chamber is taken out of the housing 13 through the corresponding feed inlet 12 and replacement port 15, and the dechlorination agent 7 in the coarse filtration chamber is replaced. Then the coarse filtration chamber is put back to realize the replaceable use of the dechlorination agent 7.

[0051] Example 6:

[0052] According to Figures 1 to 2 As shown, the difference between this embodiment and Embodiment 1 is that the multi-effect filtration table 23 includes a filtering surface 17 that is inclined downward from the fixed end 1 to the free end 2 facing the outlet 9 of the gasifier 11 and a guiding surface 16 that is inclined upward from the fixed end 1 to the free end 2 facing the gasification reaction layer 4. The guiding surface 16 faces the bottom of the adjacent single-effect filter plate 3.

[0053] Compared with Embodiment 1, this embodiment further defines the multi-effect filter table 23. The multi-effect filter table 23 includes a diversion surface 16 and a filter surface 17 that is inclined downward from the fixed end 1 to the free end 2 on the side facing the gas outlet 9 of the gasifier 11. The function is that the accumulated impurities will fall due to gravity. During the multi-cycle filtration in the gasifier 11, when the single-effect filter plate 3 is inclined downward from the fixed end 1 to the free end 2, the shell-side flow dead zone on one side of the single-effect filter plate 3 is increased. Therefore, the diversion surface 16 is inclined towards the bottom of the single-effect filter plate 3 above the adjacent side of the multi-effect filter table 23 where the diversion surface 16 is located, which serves to divert the raw gasified gas to the bottom of the single-effect filter plate 3, reducing the flow dead zone on the back of the single-effect filter plate 3, effectively utilizing the space of the gasifier 11, and making the single-effect filter plate 3 more effective in precipitating and coarsely removing solid particles.

[0054] Embodiment 7:

[0055] According to Figures 1 to 2 and Figures 6 to 7 As shown, the difference between this embodiment and Embodiment 1 is that: both the single-effect filter plate 3 and the filter surface 17 of the multi-effect filter table 23 form an angle of 30° - 70° with the horizontal plane, and the diversion surface 16 of the multi-effect filter table 23 is arranged parallel to the single-effect filter plate 3.

[0056] Compared with Embodiment 1, this embodiment further defines the single-effect filter plate 3 and the multi-effect filter table 23. The function of arranging the diversion surface 16 of the multi-effect filter table 23 parallel to the single-effect filter plate 3 is to make more raw gasified gas effectively diverted to the bottom of the single-effect filter plate 3.

[0057] Embodiment 8:

[0058] According to Figures 1 to 2 As shown, the difference between this embodiment and Embodiment 1 is that: the longitudinal orthographic projections of the single-effect filter plate 3 and the multi-effect filter table 23 do not intersect.

[0059] Compared with Embodiment 1, this embodiment further defines the single-effect filter plate 3 and the multi-effect filter table 23. The non-intersection of the longitudinal orthographic projections of the single-effect filter plate 3 and the multi-effect filter table 23 prevents local blockage of the raw gasified gas between the single-effect filter plate 3 and the multi-effect filter table 23, thereby affecting the filtration effect.

[0060] Embodiment 9:

[0061] According to Figures 1 to 7As shown in the figure, the difference between this embodiment and Embodiment 1 is that the coarse filtration bin includes a filtration main body 18 adapted to the housing 13 and a fixing plate 20. The fixing plate 20 is detachably connected to the filtration main body 18. The fixing plate 20 is detachably connected to the gasifier 11 through a locking device. The filtration main body 18 is longitudinally densely provided with filtration holes 21. The refined filtration bin 8 is arranged in the coarse filtration bin for the dechlorination agent 7 after refined filtration.

[0062] Compared with Embodiment 1, this embodiment further defines the coarse filtration bin. The coarse filtration bin includes a filtration main body 18 adapted to the housing 13 and a fixing plate 20. The fixing plate 20 is detachably connected to the filtration main body 18. The fixing plate 20 is detachably connected to the gasifier 11 through a locking device. The function of the filtration main body 18 being longitudinally densely provided with filtration holes 21 is that after the coarse gasified gas is roughly filtered by the single-effect filtration plate 3 for solid particles, it enters the dechlorination agent 7 through the filtration holes 21 to realize the filtration of solid particles and HCl. When the dechlorination agent 7 in the coarse filtration bin is in a saturated state, the coarse filtration bin is taken out of the housing 13 because the fixing plate 20 is detachably connected to the gasifier 11 through a locking device, and the dechlorination agent 7 is taken out of the coarse filtration bin by the detachable connection between the fixing plate 20 and the filtration main body 18 to realize the replacement of the dechlorination agent 7. The function of arranging the refined filtration bin 8 in the coarse filtration bin for the dechlorination agent 7 after refined filtration is that there are almost no solid particles in the coarse gasified gas filtered by the chlorine coarse filtration device, and the chlorine content in it is also greatly reduced. Therefore, after the coarse gasified gas passes through the refined filtration bin 8, the dechlorination agent 7 in the refined filtration bin 8 can still filter a large amount of solid particles and an appropriate amount of HCl, which is very suitable for use in the refined filtration bin 8. The combined utilization of the dechlorination agent 7 reduces the usage amount of the dechlorination agent 7 and lowers the dechlorination cost.

[0063] Embodiment 10:

[0064] According to Figures 1 to 2 As shown in the figure, the difference between this embodiment and Embodiment 1 is that a calcium injection conduit 22 is connected to the calcium injection port 6, and the calcium injection conduit 22 is inclined downward.

[0065] Compared with Embodiment 1, this embodiment further defines the calcium injection port 6. A calcium injection conduit 22 is connected to the calcium injection port 6, and the calcium injection conduit 22 is inclined downward so that the dechlorination agent 7 can be effectively sprayed on the garbage, further reducing the chlorine content in the coarse gasified gas.

Claims

1. A domestic waste gasification treatment system with chlorine removal function, comprising a gasification furnace and a chlorine removal system, characterized in that, The described chlorine removal system includes a chlorine fine filtration device and a chlorine rough filtration device. The chlorine rough filtration device includes several filter plates arranged from top to bottom in the gasifier. One end of the filter plate is connected to the gasifier. The upper surface of the filter plate is inclined downward from the fixed end to the free end. The filter plates in the gasifier are combined to form a filter plate group. The filter plate group includes a single-effect filter plate for filtering solid particles and a multi-effect filter table for filtering solid particles and chlorine-containing pollutants. The gasifier includes a gasification reaction layer and a filtration layer for placing the chlorine rough filtration device. The filtration layer is provided at the top of the gasification reaction layer. The gasification reaction layer is provided with a calcium injection port. When the calcium-based dechlorination agent continuously rises with the raw gasification gas and encounters the single-effect filter plate and the multi-effect filter table inclined downward from the fixed end to the free end, the solid particles and the calcium-based dechlorination agent in the rising raw gasification gas are precipitated and roughly removed, preventing the solid particles and the calcium-based dechlorination agent in the raw gasification gas from continuing to rise. After the precipitation of the calcium-based dechlorination agent, it flows back to the gasification reaction layer to form secondary dechlorination in the furnace. The single-effect filter plate and the multi-effect filter table are arranged alternately left and right from bottom to top in the gasifier to form an arcuate baffle area. The two adjacent single-effect filter plates and the multi-effect filter table above and below form a single filtration cycle. There are several such filtration cycles in the gasifier. The longitudinal orthographic projections of the single-effect filter plate and the multi-effect filter table do not intersect to prevent local blockage of the raw gasification gas between the single-effect filter plate and the multi-effect filter table, thereby affecting the filtration effect. The multi-effect filter table includes a quadrangular pyramid structure housing with a feed port opened on one side facing the gasifier and a rough filtration chamber. The rough filtration chamber for rough filtering of HCl is provided in the housing. Filter windows for air permeability are opened on both the upper and lower surfaces of the housing. A replacement port adapted to the rough filtration chamber and corresponding to the feed port is provided on the gasifier. The rough filtration chamber is detachably connected to the gasifier. The multi-effect filter table includes a filtration surface inclined downward from the fixed end to the free end facing the outlet of the gasifier and a diversion surface inclined upward from the fixed end to the free end facing the gasification reaction layer. The diversion surface faces the bottom of the adjacent single-effect filter plate. The chlorine fine filtration device is provided outside the gasifier. The chlorine fine filtration device is a fine filtration chamber with a dechlorination agent. The fine filtration chamber is connected to the outlet of the gasifier.

2. The domestic waste gasification treatment system with chlorine removal function according to claim 1, wherein The single-effect filter plate is a flat filter plate. The single-effect filter plate is rotationally connected to the gasifier through a rotating device. The rotating device includes a rotating shaft connected to the single-effect filter plate and a rotating motor. The rotating motor is connected to the rotating shaft.

3. A domestic waste gasification treatment system with a chlorine removal function according to claim 2, characterized in that, The filtration surfaces of the single-effect filter plate and the multi-effect filter table form an angle of 30° - 70° with the horizontal plane. The diversion surface of the multi-effect filter table is arranged parallel to the single-effect filter plate.

4. A domestic waste gasification treatment system with a chlorine removal function according to claim 3, characterized in that, The described coarse filtration chamber includes a filtration main body and a fixing plate adapted to the housing. The fixing plate is detachably connected to the filtration main body, and the fixing plate is detachably connected to the gasifier through a locking device. The filtration main body is longitudinally densely provided with filtration holes, and a dechlorination agent after fine filtration is provided in the coarse filtration chamber.

5. A domestic waste gasification treatment system with a chlorine removal function according to claim 4, characterized in that, A calcium injection duct is connected to the described calcium injection port, and the calcium injection duct is arranged obliquely downward.

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