A wet continuous slag discharge and conveying system for a gasifier

Abstract

The present invention discloses a wet continuous slag discharge and conveying system for a gasifier, comprising a high-pressure slag tank, a variable-pressure slag tank and a low-pressure slag tank. A slag receiving pipe is vertically arranged on the top of the high-pressure slag tank, the lower end of the slag receiving pipe penetrates the slag receiving port of the high-pressure slag tank and is placed in the high-pressure slag tank, and a plurality of spray heads are circumferentially arranged at the bottom end of the slag receiving pipe; a low-pressure slag valve is arranged on the slag outlet of the low-pressure slag tank; the variable-pressure slag tank is also connected to the low-pressure slag tank through a variable-pressure straight-discharge pipe, and a variable-pressure straight-discharge valve is arranged on the variable-pressure straight-discharge pipe. The present invention is a wet continuous slag discharge and conveying system for a gasifier, the slag discharge system has a low temperature, small environmental pollution, various process pipelines of the slag discharge system are not easy to be blocked, the slag discharge system is stable, and the four processes of frequent pressure relief, discharge, stamping and material connection of traditional dry slag discharge and wet slag discharge are avoided, the valve does not need to be frequently opened and closed, and the system failure rate is reduced.

Description

Technical field:

[0001] The invention relates to a slag removal and conveying system for a gasifier, in particular to a wet continuous slag removal and conveying system for a gasifier. Background technology:

[0002] There are two common slag removal methods for gasifiers: dry slag removal and wet slag removal. The slag removal system includes a slag receiving tank (or high-pressure slag tank), a variable pressure slag tank and a low-pressure slag tank, which are connected in sequence through valves. Among them, dry slag removal is to set a central air pipe in the slag receiving tank, and the central air pipe extends into the lower slag channel of the gasifier. The slag is discharged by gas control, that is, the slag rate is controlled by controlling the gas volume in the lower slag channel of the gasifier. The biggest disadvantage of the dry slag removal system is that it is very difficult to operate, and the central air pipe is severely worn, and may even cause leakage, causing overheating and slagging inside the lower slag channel of the gasifier, and the stability of the system operation is poor; moreover, the slag removal temperature of the dry slag removal is high, and the temperature resistance requirements of the slag removal valve are high. The slag removal pipe is prone to wear and leakage, and because the pressure relief gas carries a large amount of dust and steam, it causes serious pollution on site.

[0003] Wet slag discharge is achieved through cooling with quenching water. Although the temperature of the slag discharge system is relatively low and the environmental pollution is relatively small, the system needs to be continuously supplied with quenching water and the slag water is discharged externally, resulting in high water consumption. In addition, various process pipelines of the slag discharge system are prone to blockage, resulting in unstable production.

[0004] Moreover, both the traditional dry slag discharge and the wet slag discharge require intermittent slag discharge. When working, the valve between the slag receiving tank (or high-pressure slag tank) and the pressure-changing slag tank is always open, and the valve between the pressure-changing slag tank and the normal pressure tank is always closed; after the slag receiving tank (or high-pressure slag tank) receives the slag, the slag falls into the pressure-changing slag tank. When the pressure-changing slag tank receives a certain amount of slag and needs to be discharged, the valve between the slag receiving tank (or high-pressure slag tank) and the pressure-changing slag tank is first closed, and then the pressure-changing slag tank is depressurized to normal pressure, and then the valve between the pressure-changing slag tank and the low-pressure slag tank is opened, and the slag in the pressure-changing slag tank is discharged into the low-pressure slag tank and finally discharged; then the valve between the pressure-changing slag tank and the low-pressure slag tank is closed, and when its pressure is consistent with the pressure in the high-pressure slag tank, the valve between the slag receiving tank (or high-pressure slag tank) and the pressure-changing slag tank is opened to receive the slag again. Therefore, the traditional dry slag discharge and wet slag discharge require frequent pressure relief, discharge, stamping, and material receiving processes, and the frequent valve switching and other problems make the system failure rate very high.

[0005] In addition, during wet slag discharge, the slag water obtained generally needs to be transported over long distances before entering subsequent processing steps. Generally, mechanical transportation is used, such as using a slurry pump for transportation, which has high investment, low efficiency, high failure rate, and high subsequent maintenance costs. Summary of the invention:

[0006] In order to solve the above technical problems, the object of the present invention is to provide a wet continuous slag discharge and conveying system for a gasifier.

[0007] The present invention is implemented by the following technical scheme: a wet continuous slag discharge and conveying system for a gasifier, comprising a high-pressure slag tank, a variable-pressure slag tank and a low-pressure slag tank connected by pipelines from top to bottom, and valves are provided on the pipelines connecting the high-pressure slag tank, the variable-pressure slag tank and the low-pressure slag tank;

[0008] A slag receiving pipe is vertically arranged on the top of the high-pressure slag pot, the lower end of the slag receiving pipe passes through the slag receiving port of the high-pressure slag pot and is placed in the high-pressure slag pot, and a plurality of spray heads are circumferentially arranged at the bottom end of the slag receiving pipe;

[0009] A low-pressure slag valve is provided on the slag outlet of the low-pressure slag pot;

[0010] The variable pressure slag pot is also connected to the low pressure slag pot through a variable pressure straight discharge pipe, and a variable pressure straight discharge valve is provided on the variable pressure straight discharge pipe;

[0011] It also includes a circulating water pool and a filter press, the water outlet of the filter press is connected to the water inlet of the circulating water pool; the water outlet of the circulating water pool is connected to the spray head through a spray pipe, a high-pressure pump is provided on the spray pipe, and a spray valve is provided on the spray pipe connecting the spray head and the high-pressure pump;

[0012] The low-pressure slag tank is connected to the feed port of the filter press through a slag conveying pipe. The slag inlet of the slag conveying pipe is arranged at the lower part of the tank body of the low-pressure slag tank and is connected to the low-pressure slag tank. A slag conveying valve is provided on the slag conveying pipe.

[0013] Furthermore, it also includes a fluidizing pipe, one end of which is connected to the spray pipe between the high-pressure pump and the spray valve, and the other end of which is arranged at the bottom of the low-pressure slag tank, and a fluidizing valve is provided on the fluidizing pipe.

[0014] Furthermore, the spray pipe and the transformer slag tank are connected via a water supply pipe, one end of the water supply pipe is connected to the spray pipe between the high-pressure pump and the spray valve, and a water supply valve is provided on the water supply pipe.

[0015] Furthermore, it also includes a high-pressure straight-discharge pipe, one end of which is arranged at the lower part of the tank body of the high-pressure slag pot and is connected to the high-pressure slag pot, and the other end of the high-pressure straight-discharge pipe is connected to the pressure-changing straight-discharge pipe between the pressure-changing straight-discharge valve and the low-pressure slag pot, and a high-pressure straight-discharge valve is provided on the high-pressure straight-discharge pipe.

[0016] Furthermore, two high-pressure direct-discharge valves are provided on the high-pressure direct-discharge pipe; it also includes a high-pressure recoil pipe, one end of which is connected to the spray pipe between the high-pressure pump and the spray valve, and the other end of the high-pressure recoil pipe is connected to the high-pressure direct-discharge pipe between the two high-pressure direct-discharge valves, and a high-pressure recoil valve is provided on the high-pressure recoil pipe.

[0017] Furthermore, two pressure-transformer direct-discharge valves are provided on the pressure-transformer direct-discharge pipe; it also includes a pressure-transformer recoil pipe, one end of which is connected to the spray pipe between the high-pressure pump and the spray valve, and the other end of which is connected to the pressure-transformer direct-discharge pipe between the two pressure-transformer direct-discharge valves, and a pressure-transformer recoil valve is provided on the pressure-transformer recoil pipe.

[0018] Furthermore, two slag conveying valves are provided on the slag conveying pipe, which also includes a slag conveying recoil pipe, one end of the slag conveying recoil pipe is connected to the spray pipe between the high-pressure pump and the spray valve, and the other end of the slag conveying recoil pipe is connected to the slag conveying pipe between the two slag conveying valves, and a slag conveying recoil valve is provided on the slag conveying recoil pipe.

[0019] Furthermore, it also includes a filter press backwash pipe, one end of which is connected to the spray pipe between the high-pressure pump and the spray valve, and the other end of which is connected to the backwash port of the filter press, and a filter press backwash valve is provided on the filter press backwash pipe.

[0020] Furthermore, it also includes a controller, and a temperature sensor, a high-pressure pressure sensor and a high-pressure liquid level sensor are provided on the high-pressure slag pot; a variable pressure sensor and a variable pressure liquid level sensor are provided on the variable pressure slag pot; a low-pressure pressure sensor and a low-pressure liquid level sensor are provided on the low-pressure slag pot, and the top of the low-pressure slag pot is also connected to a drain pipe, and the drain pipe is provided with a drain valve; a high-pressure direct discharge regulating valve is provided on the high-pressure straight discharge pipe, and a variable pressure direct discharge regulating valve is provided on the variable pressure straight discharge pipe, the temperature sensor, the high-pressure pressure sensor, the high-pressure liquid level sensor, the variable pressure sensor, the variable pressure liquid level sensor, the low-pressure pressure sensor and the low-pressure liquid level sensor are all connected to the input end signal of the controller, and the output end of the controller is connected to the high-pressure direct discharge regulating valve and the variable pressure direct discharge regulating valve signal.

[0021] Furthermore, a baffle is provided in the circulating water pool, and the baffle separates the circulating water pool into a sedimentation chamber and a clean water chamber, and the sedimentation chamber and the clean water chamber are connected through an overflow port on the upper part of the baffle; the water outlet of the filter press is connected to the sedimentation chamber, and the water inlet of the spray pipe is connected to the clean water chamber.

[0022] Advantages of the present invention:

[0023] 1. The present invention is a wet continuous slag discharge and conveying system for a gasifier. Compared with the traditional dry slag discharge, no waste gas is generated and the environmental pollution is small. The present invention also avoids the need for frequent pressure relief, discharge, stamping and material receiving in the traditional dry and wet slag discharge. The valve does not need to be opened and closed frequently, and the system failure rate is reduced. Moreover, the system is simple to operate and easy to implement program control.

[0024] 2. The present invention belongs to a wet continuous slag discharge and conveying system. By adjusting the pressure of the variable pressure direct discharge regulating valve during slag discharge, continuous and stable slag discharge of the system can be achieved. In addition, the slag water in the present invention is discharged under pressure drive and is not easy to deposit. Various process pipelines of the slag discharge system are not easy to be blocked, and the slag discharge system is stable.

[0025] 3. The wet continuous slag discharge and conveying system of the present invention not only realizes the separation of slag and water during wet slag discharge of the gasifier by setting up a filter press and a circulating water pool, but also realizes the circulation of cooling water. The system consumes less water and is in line with the concept of green production.

[0026] 4. The present invention adopts non-powered equipment for transportation, and only utilizes the pressure of the gasifier to realize the transportation of slag water, avoiding the problems of high investment, low efficiency, high equipment failure rate, and high subsequent maintenance cost in traditional mechanical transportation, which can effectively save the production cost of the enterprise. Description of the drawings:

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 The present invention is a schematic structural diagram of a wet continuous slag discharge and conveying system for a gasifier.

[0029] Figure 2 This is a control diagram of a wet continuous slag discharge and conveying system for a gasifier according to the present invention.

[0030] In the figure: high pressure slag tank 1, variable pressure slag tank 2, low pressure slag tank 3, circulating water pool 4, baffle 4.1, sedimentation chamber 4.2, clean water chamber 4.3, overflow port 4.4, filter press 5, fluidizing pipe 6, high pressure straight discharge pipe 7, high pressure backwash pipe 8, slag backwash pipe 9, filter press backwash pipe 10, controller 11, slag pipe 12, spray head 13, low pressure slag valve 14, variable pressure straight discharge pipe 15, variable pressure straight discharge valve 16, spray pipe 17, high pressure pump 18, spray valve 19, slag pipe 20, slag valve 21, fluidizing pipe 22, high pressure backwash pipe 23, high pressure backwash pipe 24, high pressure backwash pipe 25, high pressure backwash pipe 26, high pressure backwash pipe 27, high pressure backwash pipe 28, high pressure backwash pipe 29, high pressure backwash pipe 30, high pressure backwash pipe 31, high pressure backwash pipe 32, high pressure backwash pipe 33, high pressure backwash pipe 34, high pressure backwash pipe 35, high pressure backwash pipe 36, high pressure backwash pipe 37, high pressure backwash pipe 38, high pressure backwash pipe 39, high pressure backwash pipe 40, high pressure backwash pipe 41, high pressure backwash pipe 42, high pressure backwash pipe 43, high pressure backwash pipe 44, high pressure backwash pipe 45, high pressure backwash pipe 46, high pressure backwash pipe 47, high pressure backwash pipe 48, high pressure backwash pipe 49, high pressure backwash pipe 50, high pressure backwash pipe 51, high pressure backwash pipe 52, high pressure backwash pipe 53, high pressure backwash pipe 54, high pressure backwash pipe 55, high pressure backwash pipe 56, high pressure backwash Chemical valve 22, water supply pipe 23, water supply valve 24, high-pressure direct discharge valve 25, high-pressure backwash valve 26, slag transport backwash valve 27, filter press backwash valve 28, temperature sensor 29, high-pressure pressure sensor 30, high-pressure liquid level sensor 31, variable pressure sensor 32, variable pressure liquid level sensor 33, low pressure sensor 34, low pressure liquid level sensor 35, drain pipe 36, drain valve 37, high-pressure direct discharge regulating valve 38, variable pressure direct discharge regulating valve 39, variable pressure direct discharge pipe 40, variable pressure backwash valve 41. Specific implementation method:

[0031] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] A wet continuous slag conveying system for a gasifier comprises a high-pressure slag tank 1, a variable-pressure slag tank 2 and a low-pressure slag tank 3 which are connected in sequence from top to bottom through pipelines, as well as a circulating water pool 4, a filter press 5, a fluidizing pipe 6, a high-pressure straight discharge pipe 7, a high-pressure recoil pipe 8, a variable-pressure recoil pipe 40, a slag conveying recoil pipe 9, a filter press recoil pipe 10 and a controller 11. Valves are provided on the pipelines connecting the high-pressure slag tank 1, the variable-pressure slag tank 2 and the low-pressure slag tank 3; the controller 11 can be a programmable single-chip microcomputer.

[0033] A slag receiving pipe 12 is vertically arranged on the top of the high-pressure slag tank 1, and the lower end of the slag receiving pipe 12 passes through the slag receiving port of the high-pressure slag tank 1 and is placed in the high-pressure slag tank 1. A plurality of spray heads 13 are circumferentially arranged at the bottom end of the slag receiving pipe 12; a low-pressure slag valve 14 is arranged on the slag outlet of the low-pressure slag tank 3, and the slag outlet of the low-pressure slag tank 3 serves as a backup slag outlet of the system. When the slag water in the low-pressure slag tank 3 needs to be discharged under special circumstances, the low-pressure slag valve 14 is opened to discharge the slag; the variable-pressure slag tank 2 is also connected to the low-pressure slag tank 3 through a variable-pressure straight-discharge pipe 15, and two variable-pressure straight-discharge valves 16 are arranged on the variable-pressure straight-discharge pipe 15;

[0034] The water outlet of the filter press 5 is connected to the water inlet of the circulating water pool 4; the water outlet of the circulating water pool 4 is connected to the spray head 13 through a spray pipe 17, a high-pressure pump 18 is provided on the spray pipe 17, and a spray valve 19 is provided on the spray pipe 17 connecting the spray head 13 and the high-pressure pump 18;

[0035] If the circulating water temperature cannot meet the slag connection requirements, air cooling or water cooling equipment can be connected to the spray pipe 17 between the circulating water pool 4 and the high-pressure pump 18 to reduce the temperature.

[0036] The low-pressure slag tank 3 is connected to the feed port of the filter press 5 through a slag conveying pipe 20 . The slag inlet of the slag conveying pipe 20 is arranged at the lower part of the tank body of the low-pressure slag tank 3 and is connected to the low-pressure slag tank 3 . Two slag conveying valves 21 are arranged on the slag conveying pipe 20 .

[0037] One end of the fluidizing pipe 6 is connected to the spray pipe 17 between the high-pressure pump 18 and the spray valve 19, and the other end of the fluidizing pipe 6 is arranged at the bottom of the low-pressure slag tank 3. A fluidizing valve 22 is arranged on the fluidizing pipe 6 to avoid the deposition of slag in the low-pressure slag tank 3 and to play a stirring role;

[0038] The spray pipe 17 and the transformer slag tank are connected via a water supply pipe 23 , one end of the water supply pipe 23 is connected to the spray pipe 17 between the high-pressure pump 18 and the spray valve 19 , and a water supply valve 24 is provided on the water supply pipe 23 .

[0039] One end of the high-pressure straight discharge pipe 7 is arranged at the lower part of the tank body of the high-pressure slag pot 1 and is connected to the high-pressure slag pot 1. The other end of the high-pressure straight discharge pipe 7 is connected to the variable pressure straight discharge valve 16 and the variable pressure straight discharge pipe 15 between the low-pressure slag pot 3. A high-pressure straight discharge valve 25 is provided on the high-pressure straight discharge pipe 7. One end of the high-pressure recoil pipe 8 is connected to the spray pipe 17 between the high-pressure pump 18 and the spray valve 19. The other end of the high-pressure recoil pipe 8 is connected to the high-pressure straight discharge pipe 7 between the two high-pressure straight discharge valves 25. A high-pressure recoil valve 26 is provided on the high-pressure recoil pipe 8.

[0040] One end of the variable pressure recoil pipe 40 is connected to the spray pipe 17 between the high-pressure pump 18 and the spray valve 19, and the other end of the variable pressure recoil pipe 40 is connected to the variable pressure straight-discharge pipe 15 between the two variable pressure straight-discharge valves 16. A variable pressure recoil valve 41 is provided on the variable pressure recoil pipe 40.

[0041] One end of the slag conveying backwash pipe 9 is connected to the spray pipe 17 between the high-pressure pump 18 and the spray valve 19, and the other end of the slag conveying backwash pipe 9 is connected to the slag conveying pipe 20 between the two slag conveying valves 21. A slag conveying backwash valve 27 is provided on the slag conveying backwash pipe 9.

[0042] One end of the filter press backwash pipe 10 is connected to the spray pipe 17 between the high-pressure pump 18 and the spray valve 19, and the other end of the filter press backwash pipe 10 is connected to the backwash port of the filter press 5. A filter press backwash valve 28 is provided on the filter press backwash pipe 10.

[0043] A temperature sensor 29, a high-pressure pressure sensor 30 and a high-pressure liquid level sensor 31 are provided on the high-pressure slag pot 1; a variable pressure sensor 32 and a variable pressure liquid level sensor 33 are provided on the variable pressure slag pot 2; a low-pressure pressure sensor 34 and a low-pressure liquid level sensor 35 are provided on the low-pressure slag pot 3, and a drain pipe 36 is also connected to the top of the low-pressure slag pot, and a drain valve 37 is provided on the drain pipe 36; a high-pressure direct discharge regulating valve 38 is provided on the high-pressure direct discharge pipe 7, and a variable pressure direct discharge regulating valve 39 is provided on the variable pressure direct discharge pipe 15. The temperature sensor 29, the high-pressure pressure sensor 30, the high-pressure liquid level sensor 31, the variable pressure sensor 32, the variable pressure liquid level sensor 33, the low-pressure pressure sensor 34 and the low-pressure liquid level sensor 35 are all connected to the input end signal of the controller 11, and the output end of the controller 11 is connected to the high-pressure direct discharge regulating valve 38 and the variable pressure direct discharge regulating valve 39.

[0044] A baffle 4.1 is provided in the circulating water pool 4, which separates the circulating water pool 4 into a sedimentation chamber 4.2 and a clean water chamber 4.3. The sedimentation chamber 4.2 and the clean water chamber 4.3 are connected through an overflow port 4.4 on the upper portion of the baffle 4.1; the water outlet of the filter press 5 is connected to the sedimentation chamber 4.2, and the water inlet of the spray pipe 17 is connected to the clean water chamber 4.3.

[0045] Working principle:

[0046] In the wet continuous slag discharge and conveying system of the gasifier of the present invention, the valve between the variable pressure slag tank 2 and the low pressure slag tank 3, the low pressure slag valve 14, the water supply valve 24, the high pressure direct discharge valve 25, the high pressure recoil valve 26, the slag conveying recoil valve 27, the filter press recoil valve 28, the drain valve 37 and the high pressure direct discharge regulating valve 38 are in a normally closed state; the valve between the high pressure slag tank 1 and the variable pressure slag tank 2, the spray valve 19, the variable pressure direct discharge valve 16, the variable pressure direct discharge regulating valve 39, the slag conveying valve 21 and the fluidizing valve 22 are in a normally open state.

[0047] When the present invention is in use, firstly, the slag receiving pipe 12 is connected to the slag outlet of the gasifier, the slag receiving pipe 12 receives the high-temperature slag from the gasifier, the high-pressure pump 18 is turned on, and the high-temperature slag is cooled by the spraying water in the spray head 13, the slag falls into the high-pressure slag tank 1, and freely settles into the transformer slag tank 2. The slag water in the transformer slag tank 2 is driven by the high pressure of the gasifier, and the slag water at the bottom is discharged into the low-pressure slag tank 3 through the transformer straight discharge pipe 15; as the slag water in the low-pressure slag tank 3 accumulates in the transformer straight discharge pipe 15, the liquid level continues to rise, and the pressure continues to increase, driving the slag water at the bottom of the low-pressure slag tank 3 to be discharged into the filter press 5 through the slag conveying pipe 20. After the slag water is filtered, the filtrate enters the sedimentation chamber 4.2 for sedimentation, and the supernatant overflows into the clean water chamber 4.3 to achieve recycling; the filtered residue is discharged to complete the slag discharge.

[0048] The present invention can monitor the high-pressure liquid level sensor 31 and then adjust the opening of the variable pressure direct discharge regulating valve 39 to stabilize the liquid level in the high-pressure slag tank 1 and ensure stable operation of the system.

[0049] The present invention can also adjust the pressure in the low-pressure slag pot 3 to meet the process requirements of the slag water transportation distance in the low-pressure slag pot 3. Specifically, the low-pressure pressure sensor 34 monitors the pressure in the low-pressure slag pot 3. When the pressure exceeds the process requirement range, the drain valve 37 is opened to reduce the pressure in the low-pressure slag pot. When the pressure meets the process requirement range, the drain valve 37 is closed.

[0050] In order to prevent the slag from being deposited at the bottom of the low-pressure slag pot 3 , the opening of the fluidizing valve 22 can cause the fluidizing pipe 6 to continuously spray water, thereby achieving fluidization of the slag water at the bottom of the low-pressure slag pot 3 .

[0051] In order to prevent sedimentation at the bottom of the transformer slag tank 2, it is necessary to regularly drain the transformer slag tank 2. When the transformer slag tank 2 is drained, close the valve connecting the high-pressure slag tank 1 and the transformer slag tank 2, release the pressure in the transformer slag tank 2 to the same pressure as the low-pressure slag tank 3 through the transformer straight discharge pipe 15, open the valve connecting the transformer slag tank 2 and the low-pressure slag tank 3, and drain the slag water in the transformer slag tank 2. If the low-pressure slag tank 3 cannot completely accommodate the slag water in the transformer slag tank 2, open the low-pressure slag valve 14 and properly drain the slag water. After the draining is completed, close the valve between the transformer slag tank 2 and the low-pressure slag tank 3, open the water replenishment valve 24, inject water into the transformer slag tank 2, and the water level rises to compress the air in the transformer slag tank 2, so that the pressure of the transformer slag tank 2 is the same as that of the high-pressure slag tank 1. Open the valve connecting the high-pressure slag tank 1 and the transformer slag tank 2, and the air in the transformer slag tank 2 can disturb the lower part of the high-pressure slag tank 1 to prevent the occurrence of faults such as bridge blockage at the lower part.

[0052] When the variable pressure slag tank 2 is emptied, the high-pressure direct discharge valve 25 and the high-pressure direct discharge regulating valve 38 are opened, and the slag water in the high-pressure slag tank 2 is directly discharged into the low-pressure slag tank 3. The liquid level in the high-pressure slag tank 1 is monitored by the high-pressure liquid level sensor 31, and the opening of the high-pressure direct discharge regulating valve 38 is adjusted to control the liquid level in the high-pressure slag tank 1 and achieve stable slag discharge of the high-pressure slag tank 1.

[0053] When the slag conveying pipe 20 needs to be cleaned, the two slag conveying valves 21 are controlled to be opened and closed respectively, and the slag conveying backwash valve 27 is opened to backwash the slag conveying pipe 20 in sections.

[0054] When the filter press 5 needs to be cleaned, the filter press backflush valve 28 is opened to backwash the filter press 5 .

[0055] When the high-pressure direct discharge pipe 7 needs to be cleaned, the two high-pressure direct discharge valves 25 are controlled to be opened and closed, and the high-pressure backwash valve 26 is opened to perform segmented backwashing on the high-pressure direct discharge pipe 7 .

[0056] When the pressure-changing in-line discharge pipe 15 needs to be cleaned, the two pressure-changing in-line discharge valves 16 are controlled to be opened and closed, and the pressure-changing backwash valve 41 is opened to backwash the pressure-changing in-line discharge pipe 15 in sections.

[0057] In this solution, the opening and closing and the opening degree of the exhaust valve 37 , the high-pressure direct discharge regulating valve 38 and the variable-pressure direct discharge regulating valve 39 can all be regulated by the controller 11 .

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A wet continuous slag discharge and conveying system for a gasifier, characterized in that: It includes a high-pressure slag tank, a variable-pressure slag tank and a low-pressure slag tank which are connected by pipelines from top to bottom in sequence, and valves are provided on the pipelines connecting the high-pressure slag tank, the variable-pressure slag tank and the low-pressure slag tank; A slag receiving pipe is vertically arranged on the top of the high-pressure slag pot, the lower end of the slag receiving pipe passes through the slag receiving port of the high-pressure slag pot and is placed in the high-pressure slag pot, and a plurality of spray heads are circumferentially arranged at the bottom end of the slag receiving pipe; A low-pressure slag valve is provided on the slag outlet of the low-pressure slag pot; The variable pressure slag pot is also connected to the low pressure slag pot through a variable pressure straight discharge pipe, and a variable pressure straight discharge valve is provided on the variable pressure straight discharge pipe; It also includes a circulating water pool and a filter press, the water outlet of the filter press is connected to the water inlet of the circulating water pool; the water outlet of the circulating water pool is connected to the spray head through a spray pipe, a high-pressure pump is provided on the spray pipe, and a spray valve is provided on the spray pipe connecting the spray head and the high-pressure pump; The low-pressure slag tank is connected to the feed port of the filter press through a slag conveying pipe. The slag inlet of the slag conveying pipe is arranged at the lower part of the tank body of the low-pressure slag tank and is connected to the low-pressure slag tank. A slag conveying valve is provided on the slag conveying pipe.

2. A wet continuous slag discharge and conveying system for a gasifier according to claim 1, characterized in that: It also includes a fluidizing pipe, one end of which is connected to the spray pipe between the high-pressure pump and the spray valve, and the other end of which is arranged at the bottom of the low-pressure slag tank. The fluidizing pipe is provided with a fluidizing valve.

3. A wet continuous slag discharge and conveying system for a gasifier according to claim 1 or 2, characterized in that: The spray pipe and the transformer slag tank are connected via a water supply pipe, one end of the water supply pipe is connected to the spray pipe between the high-pressure pump and the spray valve, and a water supply valve is provided on the water supply pipe.

4. A wet continuous slag discharge and conveying system for a gasifier according to claim 1 or 2, characterized in that: It also includes a high-pressure straight-discharge pipe, one end of which is arranged at the lower part of the tank body of the high-pressure slag pot and is connected to the high-pressure slag pot, and the other end of the high-pressure straight-discharge pipe is connected to the pressure-changing straight-discharge pipe between the pressure-changing straight-discharge valve and the low-pressure slag pot, and a high-pressure straight-discharge valve is provided on the high-pressure straight-discharge pipe.

5. A wet continuous slag discharge and conveying system for a gasifier according to claim 4, characterized in that: Two high-pressure direct-discharge valves are provided on the high-pressure direct-discharge pipe; it also includes a high-pressure recoil pipe, one end of which is connected to the spray pipe between the high-pressure pump and the spray valve, and the other end of the high-pressure recoil pipe is connected to the high-pressure direct-discharge pipe between the two high-pressure direct-discharge valves, and a high-pressure recoil valve is provided on the high-pressure recoil pipe.

6. A wet continuous slag discharge and conveying system for a gasifier according to claim 5, characterized in that: Two pressure-changing in-line valves are provided on the pressure-changing in-line pipe; it also includes a pressure-changing recoil pipe, one end of which is connected to the spray pipe between the high-pressure pump and the spray valve, and the other end of which is connected to the pressure-changing in-line pipe between the two pressure-changing in-line valves, and a pressure-changing recoil valve is provided on the pressure-changing recoil pipe.

7. A wet continuous slag discharge and conveying system for a gasifier according to claim 6, characterized in that: Two slag conveying valves are arranged on the slag conveying pipe, which also includes a slag conveying recoil pipe, one end of which is connected to the spray pipe between the high-pressure pump and the spray valve, and the other end of which is connected to the slag conveying pipe between the two slag conveying valves, and a slag conveying recoil valve is arranged on the slag conveying recoil pipe.

8. A wet continuous slag discharge and conveying system for a gasifier according to claim 7, characterized in that: It also includes a filter press backwash pipe, one end of which is connected to the spray pipe between the high-pressure pump and the spray valve, and the other end of which is connected to the backwash port of the filter press. A filter press backwash valve is provided on the filter press backwash pipe.

9. A wet continuous slag discharge and conveying system for a gasifier according to claim 8, characterized in that: It also includes a controller, and a temperature sensor, a high-pressure pressure sensor and a high-pressure liquid level sensor are provided on the high-pressure slag pot; a variable pressure sensor and a variable pressure liquid level sensor are provided on the variable pressure slag pot; a low-pressure pressure sensor and a low-pressure liquid level sensor are provided on the low-pressure slag pot, and the top of the low-pressure slag pot is also connected to a drain pipe, and the drain pipe is provided with a drain valve; a high-pressure direct discharge regulating valve is provided on the high-pressure straight discharge pipe, and a variable pressure direct discharge regulating valve is provided on the variable pressure straight discharge pipe. The temperature sensor, the high-pressure pressure sensor, the high-pressure liquid level sensor, the variable pressure sensor, the variable pressure liquid level sensor, the low-pressure pressure sensor and the low-pressure liquid level sensor are all connected to the input end signal of the controller, and the output end of the controller is connected to the high-pressure direct discharge regulating valve and the variable pressure direct discharge regulating valve signal.

10. A wet continuous slag discharge and conveying system for a gasifier according to claim 1, characterized in that: A baffle is provided in the circulating water pool, which separates the circulating water pool into a sedimentation chamber and a clean water chamber. The sedimentation chamber and the clean water chamber are connected through an overflow port on the upper part of the baffle; the water outlet of the filter press is connected to the sedimentation chamber, and the water inlet of the spray pipe is connected to the clean water chamber.

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