Efficient treatment and resource utilization system for coal gasification slag

Abstract

The invention relates to the technical field of waste resource utilization, in particular to an efficient treatment and resource utilization system for coal gasification slag. The system comprises a gasified slag hydrothermal treatment system which comprises a plurality of reaction devices, a first inlet of each reaction device is connected with a gasified slag feeding pipeline, and a second inlet of each reaction device is connected with a steam pipeline; the cooling circulation system comprises a water storage tank and a heat exchanger; the first outlet of the water storage tank is connected with a plurality of water supply pipelines, and each water supply pipeline is connected with the third inlet of the corresponding reaction device; the second outlet of the water storage tank is connected with a plurality of cooling water pipelines, and each cooling water pipeline sequentially penetrates through the reaction device and the heat exchanger corresponding to the cooling water pipeline and is connected with the first inlet of the water storage tank. The system provided by the invention solves the problem of resource waste caused by an unreasonable treatment mode of the gasification slag at present and the problems of safe operation and efficient utilization of residual load of the boiler under the working condition of variable-load operation.

Description

Technical Field

[0001] The present invention relates to the technical field of waste resource utilization, and in particular to a system for efficiently treating and resource-utilizing coal gasification slag. Background Art

[0002] Clean and efficient use of coal is an important way to promote the green and low-carbon transformation of energy. Coal gasification technology, as one of the most promising coal chemical technologies, is a key technology for achieving clean and efficient use of coal. Since coal itself contains certain inorganic minerals, and during the gasification process, the organic matter in the coal cannot be completely converted, coal gasification technology will produce a large amount of gasification slag while preparing synthesis gas. Gasification slag is composed of inorganic minerals and residual carbon, and can be divided into coarse slag and fine slag according to the slag discharge position. According to statistics, the annual emission of gasification slag is about 33 million tons, and the output is huge; and the formation of gasification slag is closely related to the raw coal and gasification process conditions, and the structural composition is complex and changeable. Therefore, the difficulty in utilizing gasification slag is one of the difficulties of current coal gasification technology.

[0003] In addition, the current storage and landfill disposal methods will not only cause certain pollution to the ecological environment, but also cause waste of resources. Therefore, how to make use of gasification slag as a resource, that is, how to effectively utilize the residual carbon and silicon and aluminum elements in the gasification slag is an urgent problem to be solved. The preparation of high value-added functional composite materials and their application in CO2 capture and sewage treatment in the coal chemical process can achieve the purpose of treating waste with waste.

[0004] At present, the load of coal-fired boilers may change frequently due to user demand when generating electricity and providing heat. Under variable load operation conditions, coal-fired boilers are prone to accidents such as furnace flameout and corrosion failure of key components, which not only affects the safe operation of coal-fired boilers, but also reduces the operating efficiency of the boilers and increases the operating costs of coal-fired boilers. Summary of the invention

[0005] In order to solve the problem of resource waste caused by the unreasonable treatment of gasification slag at present and the problem of safe operation of boilers under variable load operation conditions, the purpose of the present invention is to maintain the boiler at a safe load, efficiently utilize the remaining load on the basis of meeting the required power generation load, and provide a system for efficient treatment and resource utilization of gasification slag.

[0006] The system of the present invention maintains the coal-fired boiler in safe and economical load operation. A part of the load meets the heating and power generation needs, and the remaining load is used for resource recovery of gasified slag to generate a certain economic income, which not only increases the safety of boiler operation, but also improves the economy of the coal-fired boiler.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows.

[0008] The first aspect of the present invention provides a system for efficient treatment and resource utilization of gasified slag, comprising: a gasified slag hydrothermal treatment system, comprising a plurality of reaction devices, the first inlet of each of the reaction devices being connected to a gasified slag feeding pipeline, and the second inlet of each of the reaction devices being connected to a steam pipeline; a cooling circulation system, comprising a water storage tank and a heat exchanger; the first outlet of the water storage tank is connected to a plurality of water supply pipelines, each of the water supply pipelines is connected to the third inlet of its corresponding reaction device; the second outlet of the water storage tank is connected to a plurality of cooling water pipelines; each of the cooling water pipelines passes through the corresponding reaction device and heat exchanger in sequence, and is connected to the first inlet of the water storage tank.

[0009] The present invention performs hydrothermal treatment on gasified slag through a gasified slag hydrothermal treatment system to achieve the treatment of gasified slag waste, so that the treated gasified slag has a certain economic value. At the same time, the water required for the reaction in the gasified slag hydrothermal treatment system comes from the residual load steam corresponding to the residual load of the boiler and the boiler feed water, so that the boiler can be maintained to operate under a safe load, and the residual load of the boiler can be efficiently utilized to treat the gasified slag waste, so as to achieve resource recovery and reuse after the treatment of the gasified slag, and achieve certain economic benefits. The heat generated during the hydrothermal treatment of the gasified slag can be provided to the heat exchanger through the cooling water pipeline, and the waste heat of the reaction device can be reused through the heat exchanger, thereby improving the energy utilization efficiency and the safety of the system operation, and solving the problem of resource waste caused by the unreasonable treatment method of the current gasified slag and the problem of safe operation of the boiler under variable load conditions.

[0010] Preferably, the inlet end of each of the gasified slag feeding pipelines is connected to the gasified slag outlet of the gasifier; and the inlet end of each of the steam pipelines is connected to the steam outlet of the boiler.

[0011] The present invention utilizes part of the steam in the boiler to continuously treat the gasification slag waste generated in the gasifier, can perform efficient, low-carbon and green treatment of the gasification slag waste, prepare high value-added functional composite materials, and realize the resource recovery and utilization of the gasification slag waste.

[0012] Preferably, the steam outlet of the boiler is connected to the steam inlet of the gasifier through a steam pipeline to provide steam. The system of the present invention can realize the high-value utilization of the gasified slag produced by the gasifier, while making full use of the residual load of the boiler to improve the economy of the coal-fired boiler.

[0013] Preferably, the water inlet of the heat exchanger is connected to the boiler water feed system, and the water outlet of the heat exchanger is connected to the water inlet of the boiler.

[0014] Preferably, the cooling circulation system comprises a water deep treatment device, the water inlet of the water deep treatment device is connected to the third outlet of the water storage tank, and the water outlet of the water deep treatment device is connected to the boiler desalination jellyfish pipe.

[0015] Preferably, the gasification slag outlet of the gasifier is connected to the inlet of the gasification slag silo, and the outlet of the gasification slag silo is respectively connected to the plurality of gasification slag feeding pipelines.

[0016] Preferably, a portion of each of the cooling water pipes is coiled around the outer wall of the corresponding reaction device; another portion of each of the cooling water pipes is coiled inside the heat exchanger.

[0017] Preferably, each of the reaction devices has a temperature sensor and a pressure sensor; the reaction temperature in each of the reactors is between 200° C. and 300° C., and the reaction pressure in each of the reactors is between 1.80 MPa and 8.90 MPa.

[0018] In the present invention, the purpose of setting the reaction pressure in each reactor to be between 1.80 MPa and 8.90 MPa is to effectively maintain the reaction medium in a subcritical state.

[0019] Preferably, the gasification slag efficient processing and resource utilization system includes a product collection system, and the product collection system includes a vacuum conveyor belt and a product collection device; the discharge port of each of the reaction devices is connected to the vacuum conveyor belt; the liquid outlet of the vacuum conveyor belt is connected to the second inlet of the water storage tank; the solid outlet of the vacuum conveyor belt is arranged at the feed end of the product conveying device, and is configured to provide the separated solid product to the vacuum conveyor belt; the discharge end of the vacuum conveyor belt is arranged at the feed port of the product collection device, and is configured to transport the solid product on the vacuum conveyor belt to the product collection device.

[0020] Preferably, the gasified slag feeding pipeline, the steam pipeline, the water supply pipeline and the cooling water pipeline are all provided with control valves.

[0021] Beneficial effects of the present invention:

[0022] 1. The present invention performs hydrothermal treatment on gasified slag through a gasified slag hydrothermal treatment system to achieve the treatment of gasified slag waste, so that the treated gasified slag has a certain economic value. At the same time, the water required for the reaction in the gasified slag hydrothermal treatment system comes from the residual load steam corresponding to the residual load of the boiler and the boiler feed water, so that the boiler can be maintained to operate under a safe load, and the residual load of the boiler can be efficiently utilized to treat the gasified slag waste, so as to achieve resource recovery and reuse after the treatment of the gasified slag, and achieve certain economic benefits. The heat generated during the hydrothermal treatment of the gasified slag can be provided to the heat exchanger through the cooling water pipeline, and the waste heat of the reaction device can be reused through the heat exchanger, thereby improving the energy utilization efficiency and the safety of the system operation, and solving the problem of resource waste caused by the unreasonable treatment method of the current gasified slag and the problem of safe operation of the boiler under variable load conditions.

[0023] 2. The present invention realizes continuous treatment of gasified slag by setting up multiple reactors, which can realize continuous treatment of gasified slag to ensure efficient output of gasified slag and realize treatment and resource utilization of gasified slag waste.

[0024] 3. The present invention recycles the water generated after treating the gasified slag, and uses the water after the reaction to cool the reaction device, thereby achieving safe discharge of the reaction device, and uses the waste heat of the reaction device to indirectly heat the boiler feed water, thereby improving the thermal efficiency of the boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a system layout diagram of a system for efficient treatment and resource utilization of coal gasification slag provided in one embodiment of the present invention.

[0026] Description of reference numerals:

[0027] 1. Gasifier; 2. Gasification slag silo; 3. First reaction device; 4. Second reaction device; 5. Third reaction device; 6. Heat exchanger; 7. Water deep treatment device; 8. Water storage tank; 9. Vacuum conveyor belt; 10. Product collection device; 11. Boiler; V1. First steam switch valve; V2. Second steam switch valve; V3. Third steam switch valve; V4. First slag stop valve; V5. Second slag stop valve; V6. Third slag stop valve; V7. Second cooling water switch valve; V8. Cooling water switch valve D; V9. Cooling water switch valve F; V10. First cooling water switch valve; V11. Third cooling water switch valve; V12. Cooling water switch valve E; V13. First discharge stop valve; V14. Second discharge stop valve; V15. Third discharge stop valve. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0030] At present, the load of coal-fired boilers may change frequently due to user demand when generating electricity and providing heat. Under variable load operation conditions, coal-fired boilers are prone to accidents such as flameout in the furnace and corrosion failure of key components, which not only affects the safe operation of coal-fired boilers, but also reduces the operating efficiency of the boiler and increases the operating cost of coal-fired boilers. Therefore, when the power generation load needs to change, the boiler load can be operated at a safe load first. On the basis of meeting the required power generation load, efficient use of the remaining load and generating certain economic benefits are important methods to solve the problem of safe operation of the boiler when the load needs to be changed.

[0031] The technical solution of the present invention is further described below by means of specific examples. In the following examples, the methods described are conventional methods unless otherwise specified; the reagents and materials described are commercially available unless otherwise specified.

[0032] like Figure 1 , a system for efficient treatment and resource utilization of coal gasification slag, including: a gasification slag hydrothermal treatment system and a cooling circulation system. The gasification slag hydrothermal treatment system includes a plurality of reaction devices, the first inlet of each reaction device is connected to the gasification slag feeding pipeline, and the second inlet of each reaction device is connected to the steam pipeline; the cooling circulation system includes a water storage tank 8 and a heat exchanger 6; the first outlet of the water storage tank 8 is connected to a plurality of water supply pipelines, each of which is connected to the third inlet of the corresponding reaction device; the second outlet of the water storage tank 8 is connected to a plurality of cooling water pipelines, each of which passes through the corresponding reaction device and the heat exchanger 6 in sequence, and is connected to the first inlet of the water storage tank 8.

[0033] Specifically, the gasified slag hydrothermal treatment system performs hydrothermal treatment on the gasified slag to achieve the treatment of the gasified slag waste, so that the treated gasified slag has a certain economic value. The water required for the reaction in the gasified slag hydrothermal treatment system comes from the steam provided by the steam pipe and the water provided by the water supply pipe. This treatment method can effectively utilize part of the heating load of the boiler 11 to treat the gasified slag waste, so as to achieve resource recovery and reuse after the gasified slag treatment. The preheat generated during the hydrothermal treatment of the gasified slag can be provided to the heat exchanger 6 through the cooling water pipe, and the waste heat of the reaction device can be reused through the heat exchanger 6, thereby improving the energy utilization efficiency and the safety of the system operation.

[0034] On the basis of the above embodiment, as a more preferred embodiment, the reaction device includes a first reaction device 3, a second reaction device 4 and a third reaction device 5; the gasification slag feeding pipeline includes a first gasification slag feeding pipeline, a second gasification slag feeding pipeline and a third gasification slag feeding pipeline; the outlet of the first gasification slag feeding pipeline is connected to the first inlet of the first reaction device 3, the outlet of the second gasification slag feeding pipeline is connected to the first inlet of the second reaction device 4, and the outlet of the third gasification slag feeding pipeline is connected to the first inlet of the third reaction device 5. The steam pipeline includes a first steam pipeline, a second steam pipeline and a third steam pipeline; the outlet of the first steam pipeline is connected to the second inlet of the first reaction device 3, the outlet of the second steam pipeline is connected to the second inlet of the second reaction device 4, and the outlet of the third steam pipeline is connected to the second inlet of the third reaction device 5. The water supply pipeline includes a first water supply pipeline, a second water supply pipeline and a third water supply pipeline; the outlet of the first water supply pipeline is connected to the third inlet of the first reaction device 3, the outlet of the second water supply pipeline is connected to the third inlet of the second reaction device 4, and the outlet of the third water supply pipeline is connected to the third inlet of the third reaction device 5. The cooling water pipeline includes a first cooling water pipeline, a second cooling water pipeline and a third cooling water pipeline; the outlet of the first cooling water pipeline passes through the first reaction device 3 and the heat exchanger 6 in sequence, and is connected to the first inlet of the water tank 8, the outlet of the second cooling water pipeline passes through the second reaction device 4 and the heat exchanger 6 in sequence, and is connected to the first inlet of the water tank 8, and the outlet of the third cooling water pipeline passes through the third reaction device 5 and the heat exchanger 6 in sequence, and is connected to the first inlet of the water tank 8.

[0035] Specifically, the present invention realizes the continuous treatment and resource utilization of gasification slag waste through three reaction devices. This is mainly because it takes a certain amount of time to react to treat gasification slag waste. Therefore, by setting up multiple reaction devices, the continuous treatment of gasification slag can be achieved to ensure the efficient output of gasification slag waste and improve the treatment efficiency. Specifically, the reaction device is a reactor that can be directly purchased on the market. The water required for the reaction in the first reaction device 3, the second reaction device 4 and the third reaction device 5 comes from the steam provided by the steam pipeline and the water provided by the water supply pipeline.

[0036] On the basis of the above embodiment, as a more preferred embodiment, a portion of each cooling water pipeline is coiled around the outer wall of the corresponding reaction device; another portion of each cooling water pipeline is coiled inside the heat exchanger 6. The cooling water pipelines include cooling coils and heat exchange coils, the cooling coils are fixed inside the corresponding reactors, and the heat exchange coils are fixed inside the heat exchanger 6. Specifically, the cooling coils include a first cooling coil, a second cooling coil, and a third cooling coil, and are respectively arranged in the corresponding reactors.

[0037] On the basis of the above-mentioned embodiment, as a more preferred embodiment, the gasification slag feeding pipeline, the steam pipeline, the water supply pipeline and the cooling water pipeline are all provided with control valves.

[0038] Specifically, the first steam pipeline is provided with a first steam on-off valve V1, the second steam pipeline is provided with a second steam on-off valve V2, and the third steam pipeline is provided with a third steam on-off valve V3. The first gasification slag feeding pipeline is provided with a first slag stop valve V4, the second gasification slag feeding pipeline is provided with a second slag stop valve V5, and the third gasification slag feeding pipeline is provided with a third slag stop valve V6. The discharge port of the first reaction device 3 is provided with a first discharge stop valve V13, the discharge port of the second reaction device 4 is provided with a second discharge stop valve V14, and the discharge port of the third reaction device 5 is provided with a third discharge stop valve V15. Specifically, the first slag stop valve V4 is interlocked with the first steam on-off valve V1, the second slag stop valve V5 is interlocked with the second steam on-off valve V2, and the third slag stop valve V6 is interlocked with the third steam on-off valve V3. The first discharging stop valve V13 is interlocked with the discharging temperature of the first reaction device 3 , the second discharging stop valve V14 is interlocked with the discharging temperature of the second reaction device 4 , and the third discharging stop valve V15 is interlocked with the discharging temperature of the third reaction device 5 .

[0039] Specifically, the first reactor has a first cooling coil, the second reactor has a second cooling coil, and the third reactor has a third cooling coil; the inlet end of the first cooling coil has a first cooling water switch valve V10, and the outlet end of the first cooling coil has a second cooling water switch valve V7; the inlet end of the second cooling coil has a third cooling water switch valve V11, and the outlet end of the second cooling coil has a fourth cooling water switch valve V8; the inlet end of the third cooling coil has a fifth cooling water switch valve V12, and the outlet end of the third cooling coil has a sixth cooling water switch valve V9. Specifically, the water storage tank 8 is divided into three cooling water pipelines. After the first cooling water pipeline passes through the first cooling water switch valve V10 and the first cooling coil of the first reaction device 3, it enters the heat exchanger 6 through the second cooling water switch valve V7. After the second cooling water pipeline passes through the third cooling water switch valve V11 and the second cooling coil of the second reaction device 4, it enters the heat exchanger 6 through the fourth cooling water switch valve V8. The third cooling water pipeline passes through the fifth cooling water switch valve V12 and the third cooling coil of the third reaction device 5, and then enters the heat exchanger 6 through the sixth cooling water switch valve V9. The cooling water of the heat exchanger 6 comes from the water supply system of the boiler 11. The first cooling water switch valve V10 and the second cooling water switch valve V7 are interlocked with the first steam switch valve 1; the third cooling water switch valve V11 and the fourth cooling water switch valve V8 are interlocked with the second steam switch valve V2; the fifth cooling water switch valve V12 and the sixth cooling water switch valve V9 are interlocked with the third steam switch valve V3.

[0040] The embodiment of the present invention realizes the safe operation of the coal gasification slag efficient treatment and resource utilization system through the corresponding control valves and the interlocking of the corresponding control valves, and improves the system operation efficiency while improving the safety of the system operation.

[0041] Based on the above embodiment, as a more preferred embodiment, the inlet end of each gasification slag feeding pipeline is connected to the gasification slag outlet of the gasifier 1; the inlet end of each steam pipeline is connected to the steam outlet of the boiler 11.

[0042] Specifically, the embodiment of the present invention connects the gasifier 1 and the corresponding reaction device through a gasification slag feeding pipeline to provide gasification slag to the corresponding reaction device; and connects the boiler 11 and the reaction device through a steam pipeline to provide high-temperature steam to the corresponding reaction device. This treatment method can effectively utilize part of the heating load of the boiler 11 to treat the gasification slag waste, so as to achieve resource recovery and reuse of the gasification slag after treatment. The embodiment of the present invention uses the coal-fired boiler 11 to generate electricity and coordinately treat the gasification slag. On the basis of maintaining the boiler 11 to operate under a relatively safe and economical load, it not only meets the user's power supply and heating load, but also uses the remaining part of the load to treat the gasification slag waste, generating a certain amount of economic income and improving the operating safety of the coal-fired boiler 11.

[0043] On the basis of the above-mentioned embodiment, as a more preferred embodiment, the steam outlet of the boiler 11 is connected to the steam inlet of the gasifier 1 through a steam pipeline to provide steam. The pulverized coal feeding pipeline is connected to the feed port of the gasifier 1, and the coal gas outlet of the gasifier 1 is connected to the coal gas pipeline. In the embodiment of the present invention, the steam from the boiler 11 is provided to the gasifier 1 through the steam pipeline, and part of the heating load of the boiler 11 is used to heat-treat the pulverized coal to form coal gas. The remaining gasified slag after the heat treatment is discharged from the gasifier 1 and provided to the corresponding reaction device through the corresponding gasified slag feeding pipeline.

[0044] On the basis of the above embodiment, as a more preferred embodiment, the water inlet of the heat exchanger 6 is connected to the water supply system of the boiler 11 , and the water outlet of the heat exchanger 6 is connected to the water inlet of the boiler 11 .

[0045] Specifically, the boiler 11 water supply system is mainly used to supply water to the heat exchanger 6, which is then supplied to the boiler 11 after being heated by heat exchange in the heat exchanger 6. The embodiment of the present invention recycles the water generated after treating the gasified slag, and uses the water after the reaction to cool the reactor, thereby achieving safe discharge of the reactor, and indirectly heats the boiler 11 water supply using the waste heat of the reactor, thereby improving the thermal efficiency of the boiler 11.

[0046] On the basis of the above-mentioned embodiment, as a more preferred embodiment, the cooling circulation system includes a water deep treatment device 7, the water inlet of the water deep treatment device 7 is connected to the third outlet of the water storage tank 8, and the water outlet of the water deep treatment device 7 is connected to the desalted jellyfish pipe of the boiler 11.

[0047] Specifically, the water deep treatment device 7 is mainly used to deeply purify the water in the water storage tank 8, so that the deeply purified water enters the boiler 11 desalting jellyfish pipe, and enters the boiler 11 after heat exchange and temperature increase in the heat exchanger 6, thereby improving the thermal efficiency of the boiler 11 and realizing water recycling. The specific function of the water deep treatment device 7 is to remove excess salt in the water to achieve the purpose of deeply purifying the water in the water storage tank 8. The water deep treatment device 7 is an existing desalination device, such as an ion exchange desalination device, a reverse osmosis desalination device, etc. on the market.

[0048] Based on the above embodiment, as a more preferred embodiment, the gasification slag outlet of the gasifier 1 is connected to the inlet of the gasification slag silo 2, and the outlet of the gasification slag silo 2 is respectively connected to a plurality of gasification slag feeding pipelines.

[0049] Specifically, the gasification slag silo 2 is mainly used to store the gasification slag waste discharged from the gasifier 1, and the gasification slag waste is provided to the corresponding gasification slag feeding pipeline through the gasification slag silo 2 to control the amount of the gasification slag waste entering the corresponding reaction device.

[0050] On the basis of the above embodiment, as a more preferred embodiment, each reaction device is provided with a temperature sensor and a pressure sensor; the reaction temperature in each reactor is between 200°C and 300°C, and by adjusting the reaction pressure in each reactor to between 1.8MPa and 8.9MPa, the reaction medium can be effectively maintained in a subcritical state.

[0051] Specifically, the temperature sensor includes a first temperature sensor, a second temperature sensor and a third temperature sensor; the first temperature sensor is arranged in the first reaction device 3 to detect the temperature in the first reaction device 3; the second temperature sensor is arranged in the second reaction device 4 to detect the temperature in the second reaction device 4; the third temperature sensor is arranged in the third reaction device 5 to detect the temperature in the third reaction device 5. The pressure sensor includes a first pressure sensor, a second pressure sensor and a third pressure sensor; the first pressure sensor is arranged in the first reaction device 3 to detect the pressure in the first reaction device 3; the second pressure sensor is arranged in the second reaction device 4 to detect the pressure in the second reaction device 4; the third pressure sensor is arranged in the third reaction device 5 to detect the pressure in the third reaction device 5. The embodiment of the present invention adjusts the temperature and pressure in the corresponding reactor by combining the corresponding temperature sensor with the pressure sensor to ensure the normal progress of the reaction.

[0052] On the basis of the above-mentioned embodiment, as a more preferred embodiment, the system for efficient treatment and resource utilization of gasification slag includes a product collection system, and the product collection system includes a vacuum conveyor belt 9 and a product collection device 10; the discharge port of each reaction device is connected to the vacuum conveyor belt 9; the liquid outlet of the vacuum conveyor belt 9 is connected to the second inlet of the water tank 8; the solid outlet of the vacuum conveyor belt 9 is arranged at the feed port of the product collection device 10, and is configured to transport the solid product on the vacuum conveyor belt 9 to the product collection device 10.

[0053] Specifically, the product collection system is mainly used to collect and process the solid products after the reaction in the reaction device. Among them, the vacuum conveyor belt 9 is a vacuum conveyor belt; the vacuum conveyor belt 9 can effectively separate the solid-liquid mixture discharged from the reaction device, and the separated solid products are transported to the product collection device 10; the separated water enters the water storage tank 8.

[0054] The specific implementation of the coal gasification slag efficient treatment and resource utilization system is as follows:

[0055] By extracting part of the steam from the boiler 11 and entering the gasifier 11 to perform hydrothermal treatment on the gasified slag, resource utilization of the gasified slag is achieved; by setting up multiple reactors to ensure the continuous hydrothermal reaction of the gasified slag, continuous treatment and recovery of the gasified slag is achieved.

[0056] When the system is just started, the first steam switch valve V1 is opened, and the first material slag stop valve V4 interlocked therewith is opened, and the two are mixed and enter the first reaction device 3; when the first reaction device 3 is charged, the first steam switch valve V1 and the first material slag stop valve V4 are closed, and at the same time, the second steam switch valve V2 and the second material slag stop valve V5 interlocked therewith are opened, and the second reaction device 4 is charged; when the second reaction device 4 is charged, the second steam switch valve V2 and the second material slag stop valve V5 interlocked therewith are closed, and at the same time, the third steam switch valve V3 and the third material slag stop valve V6 interlocked therewith are opened, and the third reaction device 5 is charged; after the third reaction device 5 is charged, the third steam switch valve V3 and the third material slag stop valve V6 interlocked therewith are closed. Among them, the water required by the reaction device is the steam produced by the boiler 11 and the water stored in the water storage tank 8 of the reaction water, and the two are mixed to make the reaction temperature about 200℃~300℃, and the reaction pressure is 1.80MPa~8.90MPa.

[0057] For the first reaction device 3, the following steps are performed:

[0058] After the reaction in the first reaction device 3 is completed, the first cooling water switch valve V10 and the second cooling water switch valve V7 interlocked with the first steam switch valve V1 are opened, that is, after the first steam switch valve V1 is closed for a certain period of time, the first cooling water switch valve V10 and the second cooling water switch valve V7 are opened at a fixed time. After that, the water in the water storage tank 8 is used to cool the first reaction device 3, and the cooling water enters the heat exchanger 6 to heat the boiler 11 wastewater and finally enters the water storage tank 8.

[0059] After the first reaction device 3 is cooled, the first discharge stop valve V13 interlocked with the discharge temperature of the first reaction device 3 is opened, and the product is separated through the vacuum conveyor belt 9 and the solid product collecting device 10, and the reaction water enters the water storage tank 8. After the discharge is completed, the first discharge stop valve V13 is closed, and the feeding in the third reaction device 5 is completed.

[0060] Therefore, when the discharge of the first reaction device 3 is completed and the feeding of the third reaction device 5 is completed, the first reaction device 3 can be fed; when the feeding of the first reaction device 3 is completed, the second reaction device 4 has completed the discharge of the material after the above operation steps similar to those of the first reaction device 3, and the feeding of the second reaction device 4 can continue; when the feeding of the second reaction device 4 is completed, the discharge of the material after the above operation steps similar to those of the first reaction device 3 has been completed, and the feeding of the third reaction device 5 can continue, and the cycle is repeated.

[0061] Through the above steps, continuous feeding and processing of gasified slag can be achieved, ensuring efficient processing and resource utilization of gasified slag. In addition, excess water in the water storage tank 8 enters the desalted water pipeline of the boiler 11 through the water deep treatment device 7.

[0062] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A system for efficient treatment and resource utilization of coal gasification slag, characterized in that: include: The gasified slag hydrothermal treatment system comprises a plurality of reaction devices, wherein the first inlet of each reaction device is connected to the gasified slag feeding pipeline, and the second inlet of each reaction device is connected to the steam pipeline; A cooling circulation system comprises a water tank (8) and a heat exchanger (6); a first outlet of the water tank (8) is connected to a plurality of water supply pipes, each of the water supply pipes is connected to a third inlet of a corresponding reaction device; a second outlet of the water tank (8) is connected to a plurality of cooling water pipes; each of the cooling water pipes sequentially passes through a corresponding reaction device and a heat exchanger (6) and is connected to the first inlet of the water tank (8).

2. The system for efficient treatment and resource utilization of coal gasification slag according to claim 1, characterized in that: The inlet end of each of the gasified slag feeding pipelines is connected to the gasified slag outlet of the gasifier (1); and the inlet end of each of the steam pipelines is connected to the steam outlet of the boiler (11).

3. The system for efficient treatment and resource utilization of coal gasification slag according to claim 2, characterized in that: The steam outlet of the boiler (11) is connected to the steam inlet of the gasifier (1) via a steam pipeline for providing steam.

4. The system for efficient treatment and resource utilization of coal gasification slag according to claim 2, characterized in that: The water inlet of the heat exchanger (6) is connected to the water supply system of the boiler (11), and the water outlet of the heat exchanger (6) is connected to the water inlet of the boiler (11).

5. The system for efficient treatment and resource utilization of coal gasification slag according to claim 4, characterized in that: The cooling circulation system comprises a water deep treatment device (7), the water inlet of the water deep treatment device (7) is connected to the third outlet of the water storage tank (8), and the water outlet of the water deep treatment device (7) is connected to the desalted jellyfish pipe of the boiler (11).

6. The system for efficient treatment and resource utilization of coal gasification slag according to claim 2, characterized in that: The gasification slag outlet of the gasification furnace (1) is connected to the inlet of the gasification slag bin (2), and the outlet of the gasification slag bin (2) is respectively connected to a plurality of gasification slag feeding pipelines.

7. The system for efficient treatment and resource utilization of coal gasification slag according to claim 1, characterized in that: A portion of each cooling water pipeline is coiled around the outer wall of the corresponding reaction device; another portion of each cooling water pipeline is coiled inside the heat exchanger (6).

8. The system for efficient treatment and resource utilization of coal gasification slag according to claim 1, characterized in that: Each of the reaction devices is provided with a temperature sensor and a pressure sensor; the reaction temperature in each of the reactors is between 200° C. and 300° C., and the reaction pressure in each of the reactors is between 1.80 MPa and 8.90 MPa.

9. The system for efficient treatment and resource utilization of coal gasification slag according to claim 1, characterized in that: The coal gasification slag efficient treatment and resource utilization system comprises a product collection system, and the product collection system comprises a vacuum conveyor belt (9) and a product collection device (10); The discharge port of each reaction device is connected to a vacuum conveyor belt (9); the liquid outlet of the vacuum conveyor belt (9) is connected to the second inlet of the water storage tank (8); The discharge end of the vacuum conveyor belt (9) is arranged at the feed port of the product collecting device (10), and is configured to transport the solid product on the vacuum conveyor belt (9) into the product collecting device (10).

10. The system for efficient treatment and resource utilization of coal gasification slag according to claim 1, characterized in that: The gasified slag feeding pipeline, the steam pipeline, the water supply pipeline and the cooling water pipeline are all provided with control valves.

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