Coal water slurry gasification solid waste treatment system
By designing a solid waste treatment system for gasification of water and coal slurry, using high temperature and high pressure, grading and water removal treatment technology, solid waste is separated into low ash and high ash components, which solves the problem of poor solid waste treatment in the prior art, and realizes resource utilization and reduction treatment.
Patent Information
- Application Number
- CN202421778948.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-25
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-07-25
AI Technical Summary
The prior art fails to effectively utilize solid waste generated during gasification of water-coal slurry, resulting in these wastes relying mainly on traditional outbound landfills or undesirable combustion treatments.
A solid waste treatment system for water-coal slurry gasification is designed. Through high-temperature and high-pressure treatment, grading treatment and water removal treatment, solid waste is separated into low ash components and high ash components, and used as raw materials or building materials for water-coal slurry gasification systems, respectively.
The resource utilization and reduction of solid waste gasified by water and coal slurry are realized, and the low ash components can be reused. The high ash components can be exported and centralized after water removal treatment, which improves the efficiency of waste treatment and resource utilization.
Smart Images
Figure CN223011456U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a treatment device for solid waste, in particular to a water coal gasification solid waste treatment system. Background Art
[0002] Water coal gasification is a chemical reaction process in which water coal slurry is used as raw material, oxygen and steam are used as gasifying agents, and an oxidation-reduction reaction occurs under high temperature, high pressure and oxygen-deficient conditions to convert the combustible part of coal into combustible gas (CO and H2).
[0003] In the process of water coal gasification, the molten slag generated in the gasifier reaction enters the quench chamber water bath for separation, and then enters the slag pond and is fished out by a slag scraper to obtain gasification coarse slag, with a particle size generally < 4mm and a dry basis ash content ≥ 80%; after quenching, it enters the washing system and the flash evaporation system successively with the raw syngas, and the material discharged from the bottom is gasification fine ash, with a particle size generally < 0.5mm and a dry basis ash content of 40 - 70%; the solid content of the chemical organic sludge generated by the sewage treatment system of the water coal gasification system is about 5%, and after pressure filtration, the solid content is about 20%, and the dry basis ash content is 40 - 60%.
[0004] At present, most enterprises still use the traditional method of transporting and landfilling gasification coarse slag, gasification fine ash and chemical sludge for treatment. A small number of enterprises have begun to gradually try to mix them into boilers for combustion, but the effect is not ideal. Therefore, the prior art has not disclosed a suitable utilization method for the above-mentioned waste. Summary of the Utility Model
[0005] To overcome at least one defect of the above-mentioned prior art, in a first aspect, an embodiment of the utility model provides a water coal gasification solid waste treatment system, including:
[0006] A high-temperature and high-pressure treatment unit for performing high-temperature and high-pressure treatment on water coal gasification solid waste to release the moisture contained in the solid waste and obtain a first mixture;
[0007] A first classification unit for classifying the first mixture to obtain a second mixture and a third mixture; and
[0008] A first post-treatment unit for performing water removal treatment and / or grinding treatment on the second mixture.
[0009] According to an embodiment of the utility model, the treatment system further includes a second classification unit for classifying the third mixture to obtain a fourth mixture and a fifth mixture.
[0010] According to an embodiment of the present utility model, the second classification unit is in communication with the first post-treatment unit to feed the fourth mixture into the first post-treatment unit for water treatment and / or grinding treatment; and / or, the second classification unit includes one or more of a classification screen, a hydrocyclone, a centrifuge, a spiral classifier, and a flotation machine.
[0011] According to an embodiment of the present utility model, the treatment system further includes a first buffer tank for storing the second mixture discharged from the first classification unit and the fourth mixture discharged from the second classification unit, and the first buffer tank is in communication with the first post-treatment unit.
[0012] According to an embodiment of the present utility model, the first buffer tank is selected from a vertical storage tank, a horizontal storage tank, or an underground tank; and / or, a first stirring device is provided in the first buffer tank.
[0013] According to an embodiment of the present utility model, the treatment system further includes a third buffer tank for storing the fifth mixture.
[0014] According to an embodiment of the present utility model, the third buffer tank is selected from a vertical storage tank, a horizontal storage tank, or an underground tank; and / or, a third stirring device is provided in the third buffer tank.
[0015] According to an embodiment of the present utility model, the high-temperature and high-pressure treatment unit includes a reaction tank; and / or, the first classification unit includes one or more of a classification screen, a hydrocyclone, a centrifuge, a spiral classifier, and a flotation machine; and / or, the first post-treatment unit includes one or more of a filter press, a centrifuge, a rod mill, and a stirred mill.
[0016] According to an embodiment of the present utility model, the treatment system further includes a second buffer tank for storing the third mixture; and / or, the treatment system further includes a first buffer tank for storing the second mixture discharged from the first classification unit, and the first buffer tank is in communication with the first post-treatment unit; and / or, an on-line pressure monitoring device, an on-line temperature monitoring device, and a stirring device are provided on the reaction tank.
[0017] According to an embodiment of the present utility model, the second buffer tank is selected from a vertical storage tank, a horizontal storage tank, or an underground tank; and / or, a second stirring device is provided in the second buffer tank.
[0018] An embodiment of the water-coal slurry gasification solid waste treatment system of the present utility model can release moisture and perform classification on the solid waste generated by water-coal slurry gasification, separate the solid waste into low-ash components and high-ash components, and can use the two components as raw materials, building materials, etc. of the water-coal slurry gasification system respectively, thereby realizing the resource utilization of the water-coal slurry gasification solid waste. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The drawings are only for the purpose of showing specific embodiments and are not considered as a limitation to the present utility model.
[0020] Wherein:
[0021] Figure 1 is a schematic structural diagram of a water-coal slurry gasification solid waste treatment system according to an embodiment of the present utility model;
[0022] The descriptions of the reference numerals are as follows:
[0023] 10, reaction tank; 21, first classification device; 22, second classification device; 31, first buffer tank; 31a, first stirring device; 32, second buffer tank; 32a, second stirring device; 33, third buffer tank; 33a, third stirring device; 40, first post-treatment unit; 50, second post-treatment unit; 61, first transfer pump; 62, second transfer pump; 63, third transfer pump; 64, fourth transfer pump. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0024] Typical embodiments embodying the features and advantages of the present utility model will be described in detail in the following description. It should be understood that the present utility model can have various variations in different embodiments, all of which do not depart from the scope of the present utility model, and the descriptions therein are essentially for illustrative purposes and not for limiting the present utility model.
[0025] Referring to Figure 1 as shown, an embodiment of the present utility model provides a water-coal slurry gasification solid waste treatment system, including:
[0026] A high-temperature and high-pressure treatment unit for performing high-temperature and high-pressure treatment on the water-coal slurry gasification solid waste to release the moisture contained in the solid waste and obtain a first mixture;
[0027] A first classification unit for classifying the first mixture to obtain a second mixture and a third mixture; and
[0028] A first post-treatment unit 40 for performing water removal treatment and / or grinding treatment on the second mixture;
[0029] Wherein, the water content of the third mixture is greater than that of the second mixture, and the ash content of the second mixture is lower than that of the third mixture.
[0030] In one embodiment, the solid waste from coal water slurry gasification includes gasification coarse slag, gasification fine ash, and chemical organic sludge generated during the coal water slurry gasification process. Among them, the gasification coarse slag is the slag discharged from the gasification lock hopper of the coal water slurry gasifier, the gasification fine ash is the slag collected at the bottom of the sedimentation tank of the gasification system or the dehydrated slag after dehydration of the collected slag, and the chemical organic sludge is the organic sludge produced by the chemical plant itself or generated by other factories in the park.
[0031] In one embodiment, the particle size of the gasification coarse slag is < 4 mm, and the dry basis ash content is ≥ 80%; the particle size of the gasification fine ash is < 0.5 mm, and the dry basis ash content is 40 - 70%; the solid content of the organic sludge is about 5%, and the solid content is about 20% after pressure filtration, and the dry basis ash content is 40 - 60%.
[0032] In one embodiment, the coal water slurry gasification can adopt a production device of the coal water slurry entrained flow gasification technology, such as a production device of the four-nozzle opposed coal water slurry gasification technology.
[0033] In one embodiment, the high-temperature and high-pressure treatment unit includes a reaction tank 10, and the solid waste from coal water slurry gasification is kept in the reaction tank 10 under high-temperature and high-pressure conditions to release the internal water in the solid waste and improve the fluidity of the material.
[0034] In one embodiment, the reaction tank 10 can be an existing device for implementing and maintaining high-temperature and high-pressure conditions.
[0035] In one embodiment, the pressure in the reaction tank 10 during the operation process can be ≥ 2.5 MPa, the temperature can be ≥ 220 °C, and the treatment time or retention time of the solid waste in the reaction tank 10 can be within 8 minutes, such as 3 minutes, 5 minutes, or 7 minutes.
[0036] In one embodiment, a stirring device is provided in the reaction tank 10 to prevent the material in the reaction tank 10 from depositing. Further, an on-line pressure monitoring device and an on-line temperature monitoring device can also be provided in the reaction tank 10 to achieve accurate monitoring of the temperature and pressure in the tank.
[0037] In one embodiment, the high-temperature and high-pressure treatment unit is connected to the first classification unit. Further, a first transfer pump 61 is provided between the high-temperature and high-pressure treatment unit and the first classification unit to transfer the first mixture in the reaction tank 10 to the first classification unit for classification treatment (or separation treatment).
[0038] In one embodiment, the first classification unit includes a first classification device 21, and the first classification device 21 can be a classification screen, a cyclone, a centrifuge, a spiral classifier, or a flotation machine. Among them, the classification particle size of the first classification device 21 can be 1.0 - 3.0 mm.
[0039] In one embodiment, the screen hole size of the sizing screen used as the first sizing device 21 may be 1.0 - 3.0 mm.
[0040] In one embodiment, through the treatment of the first sizing device 21, the first mixture can be sized into a second mixture and a third mixture, and the ash content of the second mixture (low-ash component) is lower than that of the third mixture (high-ash component).
[0041] In one embodiment, the coal water slurry gasification solid waste treatment system further includes a first buffer tank 31 for storing the second mixture discharged from the first sizing device 21; further, the first buffer tank 31 can be arranged below the first sizing device 21 or the position of the first buffer tank 31 is lower than that of the first sizing device 21, so that the second mixture can flow by gravity into the second buffer tank 32.
[0042] In one embodiment, the first buffer tank 31 can be a vertical storage tank, a horizontal storage tank or an underground tank. Further, a first stirring device 31a can be arranged in the first buffer tank 31 to stir the second mixture.
[0043] In one embodiment, the first buffer tank 31 is connected to the first post-treatment unit 40 to send the materials in the tank into the first post-treatment unit 40 for treatment. Further, a second transfer pump 62 is arranged between the first buffer tank 31 and the first post-treatment unit 40 for transferring the materials in the first buffer tank 31.
[0044] In one embodiment, the first post-treatment unit 40 includes one or more of a filter press, a centrifuge, a rod mill, and a stirred mill to perform water removal treatment and / or grinding treatment on the materials.
[0045] In one embodiment, the coal water slurry gasification solid waste treatment system further includes a second post-treatment unit 50 for performing, for example, water removal treatment on the materials. The third mixture can be treated by the second post-treatment unit 50, or after the third mixture is further sized and then corresponding treatment is carried out.
[0046] In one embodiment, the coal water slurry gasification solid waste treatment system further includes a second buffer tank 32 for storing the third mixture discharged from the first sizing device 21. Further, the second buffer tank 32 can be arranged below the first sizing device 21 or the position of the second buffer tank 32 is lower than that of the first sizing device 21, so that the third mixture can flow by gravity into the second buffer tank 32.
[0047] In one embodiment, the second buffer tank 32 can be a vertical storage tank, a horizontal storage tank or an underground tank. Further, a second stirring device 32a can be provided in the second buffer tank 32 to stir the third mixture.
[0048] In one embodiment, the second buffer tank 32 can be connected to the second post-treatment unit 50; further, a third transfer pump 63 can be provided between the second buffer tank 32 and the second post-treatment unit 50 for transferring the third mixture.
[0049] In one embodiment, the coal water slurry gasification solid waste treatment system further includes a second classification unit for classifying the third mixture discharged from the first classification device 21 to obtain a fourth mixture and a fifth mixture, wherein the ash content of the fourth mixture is lower than that of the fifth mixture.
[0050] In one embodiment, the second classification unit is connected to the first post-treatment unit 40 to feed the fourth mixture into the first post-treatment unit 40 for water treatment and / or grinding treatment.
[0051] In one embodiment, the second classification unit includes a second classification device 22, and the third mixture can be classified by the second classification device 22; the second classification device 22 can be a classification screen, a hydrocyclone, a centrifuge, a spiral classifier or a flotation machine. Among them, the classification particle size of the second classification device 22 can be 0.5 - 1.0 mm.
[0052] In one embodiment, the screen hole size of the classification screen used as the second classification device 22 can be 0.5 - 1.0 mm.
[0053] In one embodiment, the second classification device 22 can be arranged below the first classification device 21 or the position of the second classification device 22 is lower than that of the first classification device 21, so that the third mixture can flow by gravity into the second classification device 22.
[0054] In one embodiment, the coal water slurry gasification solid waste treatment system further includes a third buffer tank 33 for storing the fifth mixture discharged from the second classification device 22; further, the third buffer tank 33 can be arranged below the second classification device 22 or the position of the third buffer tank 33 is lower than that of the second classification device 22, so that the fifth mixture can flow by gravity into the third buffer tank 33. Further, a fourth transfer pump 64 can be provided between the third buffer tank 33 and the second post-treatment unit 50 for transferring the fifth mixture.
[0055] In one embodiment, the third buffer tank 33 can be a vertical storage tank, a horizontal storage tank or an underground tank. Further, a second stirring device 33a can be provided in the third buffer tank 33 to stir the fifth mixture.
[0056] In one embodiment, the fourth mixture discharged from the second classification device 22 can be placed in the first buffer tank 31. After the fourth mixture is mixed with the second mixture in the first buffer tank 31, they are jointly processed by the subsequent first post-treatment unit 40. Further, the first buffer tank 31 can be arranged below the second classification device 22 or the position of the first buffer tank 31 is lower than that of the second classification device 22, so that the fourth mixture can flow by gravity into the first buffer tank 31.
[0057] In one embodiment, the ash content of the second mixture or the second mixture and the fourth mixture (low-ash component) is relatively low, and they can be reused as raw materials for the water coal slurry gasification system after being processed by the first post-treatment unit 40; the ash content of the third mixture or the fifth mixture (high-ash component) is relatively high, and after being treated by water removal, it is sent to the park for centralized treatment, thus realizing the reduction and resource utilization of the solid waste in the water coal slurry gasification.
[0058] In one embodiment, the dry basis ash content of the low-ash component is ≤30%, and the dry basis ash content of the high-ash component is ≥60%. Further, the recovery rate of the low-ash component can be ≥30%, and the recovery rate of the high-ash component can be less than 70%, such as 65%.
[0059] In a water coal slurry gasification solid waste treatment system according to an embodiment of the present invention, during operation, gasification coarse slag, gasification fine ash and chemical organic sludge are added to the reaction tank 10 and maintained for ≤8 min under the conditions of ≥2.5 MPa and ≥220 °C to release the internal water in the above-mentioned solid waste and obtain a first mixture with better fluidity; then, under the action of the first transfer pump 61, the first mixture is transported to the first classification device 21 for classification treatment to obtain a second mixture with a relatively low ash content and a third mixture with a relatively high ash content; the second mixture enters the first buffer tank 31, and then, under the action of the second transfer pump 62, the second mixture is introduced into the first post-treatment unit 40 for water removal treatment and / or grinding treatment;
[0060] The third mixture enters the second buffer tank 32, and then, under the action of the third transfer pump 63, the third mixture is introduced into the second post-treatment unit 50 for treatment; or, the third mixture is introduced into the second classification device 22 for classification treatment to obtain a fourth mixture with a relatively low ash content and a fifth mixture with a relatively high ash content; then, the fourth mixture enters the first buffer tank 31, and after being mixed with the second mixture, they enter the first post-treatment unit 40 for treatment together; the fifth mixture enters the third buffer tank 33, and then, under the action of the fourth transfer pump 64, the fifth mixture is introduced into the second post-treatment unit 50 for treatment.
[0061] A water-coal slurry gasification solid waste treatment system according to an embodiment of the present invention can separate solid waste generated by water-coal slurry gasification into low-ash components and high-ash components through moisture release, classification, etc., and can reduce the amount of solid waste by ≥30%. The low-ash components are used as raw materials for the water-coal slurry gasification system, and the high-ash components are sent to the park for centralized treatment after water treatment, thereby realizing the reduction and resource utilization of water-coal slurry gasification solid waste.
[0062] Unless otherwise specified, the terms used in the present invention have the meanings commonly understood by those skilled in the art.
[0063] The embodiments described in the present invention are for illustrative purposes only and are not intended to limit the protection scope of the present invention. Those skilled in the art can make various other substitutions, changes, and improvements within the scope of the present invention. Therefore, the present invention is not limited to the above embodiments and is only defined by the claims.
Claims
1. A water-coal slurry gasification solid waste treatment system, characterized in that: include: A high temperature and high pressure treatment unit, used for performing high temperature and high pressure treatment on the water-coal slurry gasification solid waste to release the water contained in the solid waste to obtain a first mixture; A first classification unit, used for classifying the first mixture to obtain a second mixture and a third mixture; a first post-processing unit, for performing a water removal process and / or a grinding process on the second mixture; a second classification unit, for classifying the third mixture to obtain a fourth mixture and a fifth mixture; The second classification unit is connected to the first post-processing unit so as to send the fourth mixture to the first post-processing unit for water removal and / or grinding.
2. The processing system according to claim 1, characterized in that The second classification unit includes one or more of a classification screen, a cyclone, a centrifuge, a spiral classifier, and a flotation machine.
3. The processing system according to claim 1, characterized in that It also includes a first buffer tank for containing the second mixture discharged from the first classification unit and the fourth mixture discharged from the second classification unit, and the first buffer tank is connected to the first post-processing unit.
4. The processing system according to claim 3, characterized in that The first buffer tank is selected from a vertical storage tank, a horizontal storage tank or an underground tank; and / or, A first stirring device is arranged in the first buffer tank.
5. The processing system according to claim 1, characterized in that The system also includes a third buffer tank for containing the fifth mixture.
6. The processing system according to claim 5, characterized in that The third buffer tank is selected from a vertical storage tank, a horizontal storage tank or an underground tank; and / or, A third stirring device is arranged in the third buffer tank.
7. The processing system according to claim 1, characterized in that The high temperature and high pressure processing unit comprises a reaction tank; and / or, The first classification unit includes one or more of a classification screen, a cyclone, a centrifuge, a spiral classifier, and a flotation machine; and / or, The first post-processing unit includes one or more of a filter press, a centrifuge, a rod mill, and a stirred mill.
8. The processing system according to claim 7, characterized in that Also includes a second buffer tank for containing the third mixture; and / or, The treatment system further comprises a first buffer tank for containing the second mixture discharged from the first classification unit, the first buffer tank being connected to the first post-treatment unit; and / or, An online pressure monitoring device, an online temperature monitoring device and a stirring device are arranged on the reaction tank.
9. The processing system according to claim 8, characterized in that The second buffer tank is selected from a vertical storage tank, a horizontal storage tank or an underground tank; and / or, A second stirring device is arranged in the second buffer tank.