Coal water slurry gasification process system

Abstract

The utility model discloses a coal water slurry gasification process system which comprises a grey water tank, a filtrate receiving tank and a third pipeline, the grey water tank is used for storing low-pressure grey water, a first pipeline is led out of the grey water tank, and the first pipeline is used for leading out the low-pressure grey water to a sewage treatment unit; the filtrate receiving tank is used for storing raw water and filtrate, a second pipeline is led out of the filtrate receiving tank, and the second pipeline is used for being communicated with the coal mill and supplementing liquid to the coal mill; the two ends of the third pipeline are respectively communicated with the inlet end of the first pipeline and the filtrate receiving tank, so that at least part of low-pressure grey water in the first pipeline is introduced into the filtrate receiving tank according to a specified flow.

Description

Technical Field

[0001] The present application relates to the technical field of water-coal slurry gasification technology, and in particular to a water-coal slurry gasification technology system. Background Art

[0002] GE's water-coal slurry gasification process is to add additives, solvents and water to the raw coal to grind out qualified water-coal slurry, which is then pressurized and sprayed into a gasifier to react with oxygen or oxygen-enriched gas under pressurized and high-temperature conditions to produce high-temperature synthesis gas, which is then recovered through heat recovery to generate wet coal gas.

[0003] The water used in the gasification process for coal-water slurry is the final water from the vacuum belt filter. Conventional producers need to continuously supplement raw water to meet the gasification requirements due to insufficient final water from the filter.

[0004] However, frequent raw water replenishment is not only cumbersome but also costly. Utility Model Content

[0005] The first aspect of the present application provides a water-coal slurry gasification process system, which comprises

[0006] A grey water tank, the grey water tank is used to store low-pressure grey water, the grey water tank is externally connected to a first pipeline, the first pipeline is used to lead the low-pressure grey water to a sewage treatment unit;

[0007] A filtrate receiving tank, the filtrate receiving tank is used to store raw water and filtrate, a second pipeline is led out of the filtrate receiving tank, and the second pipeline is used to connect to the coal mill and replenish liquid to the coal mill;

[0008] The third pipeline has two ends connected to the inlet end of the first pipeline and the filtrate receiving tank respectively, so as to introduce at least part of the low-pressure grey water in the first pipeline into the filtrate receiving tank at a specified flow rate.

[0009] In some modified implementations of the first aspect of the present application, the aforementioned water-coal slurry gasification process system also includes a fourth pipeline, which is connected in parallel with the third pipeline between the inlet end of the first pipeline and the outlet of the filtrate receiving tank, so that the third pipeline and / or the fourth pipeline introduces at least part of the low-pressure gray water in the first pipeline into the filtrate receiving tank at a specified flow rate.

[0010] In some modified implementations of the first aspect of the present application, in the aforementioned water-coal slurry gasification process system, a first ball valve and a first blind plate are provided at one end of the third pipeline facing the inlet end of the first pipeline, and the first ball valve and the first blind plate are arranged in sequence along the liquid flow direction in the third pipeline.

[0011] In some modified implementations of the first aspect of the present application, the aforementioned water-coal slurry gasification process system further includes a controller;

[0012] A liquid level meter is provided at a specified height in the filtrate receiving tank, and the liquid level meter is connected to the controller signal to send a level signal to the controller;

[0013] The third pipeline is provided with a stop valve, and the stop valve is connected to the controller signal. The controller controls the shutoff of the stop valve according to the in-place signal.

[0014] In some modified implementations of the first aspect of the present application, in the aforementioned water-coal slurry gasification process system, a front hand valve and a rear hand valve are respectively provided before and after the stop valve on the third pipeline.

[0015] In some modified implementations of the first aspect of the present application, the aforementioned water-coal slurry gasification process system further includes a fifth pipeline;

[0016] Two ends of the fifth pipeline are respectively connected to the front and rear ends of the stop valve on the third pipeline, and a bypass valve is provided on the fifth pipeline.

[0017] In some modified implementations of the first aspect of the present application, in the aforementioned water-coal slurry gasification process system, a first shower valve is provided at the lowest point of the third pipeline;

[0018] The first pipeline is provided with a first water pump;

[0019] The third pipeline is connected between the first water pump and the outlet end of the first pipeline.

[0020] In some modified implementations of the first aspect of the present application, in the aforementioned water-coal slurry gasification process system, a second ball valve and a second blind plate are provided on one end of the fourth pipeline facing the inlet end of the first pipeline.

[0021] In some modified implementations of the first aspect of the present application, in the aforementioned water-coal slurry gasification process system, a third ball valve is provided on one end of the fourth pipeline facing the outlet end of the second pipeline.

[0022] In some modified implementations of the first aspect of the present application, in the aforementioned water-coal slurry gasification process system, a second shower valve is provided at the lowest point of the fourth pipeline;

[0023] The second pipeline is provided with a second water pump;

[0024] The outlet end of the fourth pipeline is connected to the outlet end of the second water pump.

[0025] Compared with the prior art, the water-coal slurry gasification process system provided in the present application connects the ash water tank with the filtrate receiving tank through a third pipeline, and uses low-pressure ash water in combination with the filtrate receiving tank to replenish liquid to the coal mill side, which can not only avoid the frequent operation of repeatedly replenishing raw water into the filtrate receiving tank, but also save raw water to reduce costs. In addition, at least part of the low-pressure ash water in the ash water tank can be utilized to reduce sewage discharge and treatment volume, and reduce environmental protection disposal pressure; thereby solving the problem in the prior art that the coal mill needs to be frequently replenished with raw water, which is not only cumbersome to operate but also affects the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present application will become easy to understand. In the accompanying drawings, several embodiments of the present application are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0027] Figure 1 The first structural schematic diagram of the water-coal slurry gasification process system provided in this embodiment is schematically shown;

[0028] Figure 2 A second structural schematic diagram of the water-coal slurry gasification process system provided in this embodiment is schematically shown;

[0029] Figure 3 The third structural schematic diagram of the water-coal slurry gasification process system provided in this embodiment is schematically shown;

[0030] Figure 4 The fourth structural schematic diagram of the water-coal slurry gasification process system provided in this embodiment is schematically shown;

[0031] Explanation of the accompanying drawings: gray water tank 1, first water pump 11, first branch 12, control valve 13, filtrate receiving tank 2, second water pump 21, second branch 22, third pipeline 3, first ball valve 31, first blind plate 32, stop valve 33, front hand valve 34, rear hand valve 35, first shower valve 36, first pipeline 4, second pipeline 5, fourth pipeline 6, second shower 61, second ball valve 62, second blind plate 63, third ball valve 64, fifth pipeline 7, bypass valve 71. DETAILED DESCRIPTION

[0032] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0033] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which this application belongs.

[0034] The technical solution of the embodiment of the present disclosure is to solve the above technical problems, and the overall idea is as follows:

[0035] Example 1

[0036] Reference Figure 1 The water-coal slurry gasification process system provided by the embodiment of the present disclosure includes an ash water tank 1, a filtrate receiving tank 2 and a third pipeline 3. The ash water tank 1 is used to store low-pressure ash water, and the ash water tank 1 is connected to a first pipeline 4, and the first pipeline 4 is used to guide the low-pressure ash water to a sewage treatment unit (not shown in the figure); the filtrate receiving tank 2 is used to store raw water and filtrate, and the filtrate receiving tank 2 is connected to a second pipeline 5, and the second pipeline 5 is used to connect to a coal mill (not shown in the figure) and replenish liquid to the coal mill; the two ends of the third pipeline 3 are respectively connected to the inlet end of the first pipeline 4 and the filtrate receiving tank 2, so as to introduce at least part of the low-pressure ash water in the first pipeline 4 into the filtrate receiving tank 2 according to a specified flow rate.

[0037] Specifically, in order to solve the problem in the prior art that the coal mill needs to be frequently replenished with raw water, which is not only cumbersome to operate but also affects the cost, the water-coal slurry gasification process system provided in this embodiment sets a third pipeline 3 between the ash water tank 1 and the filtrate receiving tank 2, so that low-pressure ash water can enter the filtrate receiving tank 2 through the third pipeline 3 as a replenishing liquid for the coal mill, thereby avoiding the frequent operation of replenishing the raw liquid into the filtrate receiving tank 2 and reducing the cost of replenishing the raw liquid; at the same time, the use of low-pressure ash water can effectively reduce the discharge volume of dripping ash water and the amount of sewage treatment, greatly reduce the burden and cost of sewage treatment, reduce the difficulty of cleaning the scale on the pipe wall of the first pipeline, and improve the environmental protection level of the overall system.

[0038] Among them, after the coal slurry is burned in the gasification furnace (not shown in the figure), a large amount of ash and wastewater are generated, among which the wastewater with a higher solid content is sent to the slag water flash evaporation system for high-pressure, low-pressure, and negative-pressure flash evaporation. The low-pressure ash water, that is, part of the wastewater generated after flash evaporation is used as system water, and the remaining part is sent to the sewage system for treatment. In this process, the ash water tank 1 is used as a storage container for low-pressure ash water. The ash water tank 1 in this embodiment is similar to or the same as the structure well known to those skilled in the art. It has a rigid tank structure. The specific shape and size are not limited here. It can be designed and adjusted according to actual needs and will not be described here. The first pipeline 4 is a rigid pipeline, which is used to guide at least part of the low-pressure ash water in the ash water tank 1 to the sewage treatment unit for sewage treatment. The shape and size of the first pipeline 4 are not limited here. The first pipeline 4 can be made of acid and alkali resistant materials to ensure the service life of the first pipeline 4. In this embodiment, a first water pump 11 can be set at one end of the first pipeline 4 facing the gray water tank 1 to draw out the low-pressure gray water, and at the same time, a first branch 12 can be set on the first pipeline 4 at the front end of the first water pump 11, so that the first branch 12 can be connected to other programs in the system to provide system water for them; it can be understood that control valves 13 can be set on the first branch 12 and the first pipeline 4 at the front end of the first branch 12, respectively, which can be manual regulating valves or automatic control valves, so as to flexibly control the water supply to the sewage treatment unit and other programs in the system. It can be understood that in this embodiment, the front end of the pipeline refers to the direction along the liquid flow in the pipeline as the front, and the direction of the liquid source is the back. The front end and the back end of the pipeline set in the following content are all based on the same principle, which will not be repeated later.

[0039] Among them, the filtrate receiving tank 2 is a rigid structure with a containing space, which is used to receive and store raw water and filtrate, so as to supply the required raw water and filtrate to the coal mill; the filtrate receiving tank 2 in this embodiment is similar to or the same as the structure well known to those skilled in the art, and the specific shape and size are not limited here, and can be designed and adjusted according to actual needs, and will not be repeated here. The second pipeline 5 is a rigid pipeline, which is used to guide the raw water and filtrate in the filtrate receiving tank 2 to the coal mill for water supply. The shape and size of the second pipeline 5 are not limited here, and the second pipeline 5 can be made of acid and alkali resistant materials to ensure the service life of the second pipeline 5. In this embodiment, a second water pump 21 can be set at one end of the second pipeline 5 toward the filtrate receiving tank 5 to draw out the raw water and the filtrate, and at the same time, a second branch 22 can be set on the second pipeline 5 at the front end of the second water pump 21, so that the second branch 22 can be connected to other programs of the system to provide them with system water; it can be understood that control valves 13 can be respectively set on the second branch 22 and the second pipeline 5 located at the front end of the second branch 22 to flexibly control the water supply to the coal mill and other programs of the system.

[0040] Among them, the sewage treatment unit and the coal mill are both easily understood by technical personnel in this field. This application does not involve improvements to the above two contents, and this scheme will not affect the settings of the above two contents, and thus they are not described in detail in this embodiment.

[0041] Among them, the third pipeline 3 is a rigid pipeline, which forms a connecting channel between the ash water tank 1 and the filtrate receiving tank 2, so that at least the low-pressure ash water in the ash water tank 1 can enter the filtrate receiving tank 2 through the third pipeline 3 when passing through the first pipeline 4 as a supplementary liquid to supply water to the coal mill; the process can be achieved by using the pressure difference, for example, when the filtrate receiving tank 2 and the first pipeline 4 are not working, the two are in an isobaric state. Once the work starts, the low-pressure ash water is introduced into the first pipeline 4, and the raw water and filtrate in the filtrate receiving tank 2 gradually decrease. The pressure in the first pipeline 4 is significantly greater than the pressure in the third pipeline 3 and the filtrate receiving tank 2. Then, the low-pressure ash water can automatically enter the third pipeline 3 and enter the filtrate receiving tank 2 under the action of the pressure difference; the process can also be provided with a water pump on the third pipeline 3 to actively lead the low-pressure ash water in the first pipeline 4 to the filtrate receiving tank 2. Under this setting mode, not only can low-pressure gray water be used to replace raw water in the filtrate receiving tank 2 to supply water to the coal mill, reducing the frequency and cost of raw water replenishment, but also the low-pressure gray water drained from the first pipeline 4 to the sewage treatment unit can be reduced, and the scaling and blockage problems caused by the long-term treatment of low-pressure gray water by the cooler (not shown in the figure) between the first water pump 11 and the sewage treatment unit can be alleviated, thereby reducing the environmental protection disposal pressure of the overall system. Of course, a control valve or a regulating valve can be set on the third pipeline 3 to control the start and stop of the low-pressure gray water entering the filtrate receiving tank 2 and even the rate.

[0042] According to the above, the water-coal slurry gasification process system provided by the present application connects the ash water tank 1 with the filtrate receiving tank 2 through the third pipeline 3, and uses low-pressure ash water in combination with the filtrate receiving tank 2 to replenish liquid to the coal mill side, which can not only avoid the frequent operation of repeatedly replenishing raw water into the filtrate receiving tank 2, but also save raw water to reduce costs. In addition, at least part of the low-pressure ash water in the ash water tank 1 can be utilized to reduce sewage discharge and treatment volume, and reduce environmental protection disposal pressure; thereby solving the problem in the prior art that the coal mill needs to be frequently replenished with raw water, which is not only cumbersome to operate but also affects the cost.

[0043] The term "and / or" in this article is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B, which is specifically understood as: A and B may be included at the same time, A may exist alone, or B may exist alone, and any of the above three situations may exist.

[0044] Further, see Attachment Figure 2The water-coal slurry gasification process system provided in this embodiment, in a specific implementation, further includes a fourth pipeline 6, and the fourth pipeline 6 is connected in parallel with the third pipeline 3 between the inlet end of the first pipeline 4 and the outlet of the filtrate receiving tank 2, so that the third pipeline 3 and / or the fourth pipeline 6 introduces at least part of the low-pressure gray water in the first pipeline 4 into the filtrate receiving tank 2 at a specified flow rate.

[0045] Specifically, in order to ensure stable liquid supply to the filtrate receiving tank 2 and avoid the third pipeline 3 from being unable to work due to maintenance or sudden situations, the fourth pipeline 6 is provided in this embodiment. The fourth pipeline 6 is a rigid pipeline structure. In this embodiment, it can be made of acid and alkali resistant materials to ensure the service life of the fourth pipeline 6. The size and shape of the fourth pipeline 6 are not limited here. It can be the same as the third pipeline 3 or different from the third pipeline 3. It can be designed and adjusted according to actual needs. The fourth pipeline 6 is connected in parallel with the third pipeline 3, and can perform diversion work at the same time as the third pipeline 3, or can selectively perform a separate diversion work. For example, in daily production, the third pipeline 3 is selected to perform diversion work alone and mainly. When the third pipeline 3 needs to be cleaned and maintained, the third pipeline 3 can be closed and the fourth pipeline 6 can be started; the way in which the fourth pipeline 6 diverts the low-pressure gray water in the first pipeline 4 to the filtrate receiving tank 2 can refer to the aforementioned description of the third pipeline 3, and no further elaboration is made here. The fourth pipeline 6 is connected to the outlet of the filtrate receiving tank 2. Referring to the above content, it is connected to the outlet of the second water pump 21, and can directly supply liquid to the coal mill without passing through the filtrate receiving tank 2, which greatly improves efficiency and ensures the high efficiency of the fourth pipeline 6 when used as a backup pipeline. Of course, it is understandable that a control valve or a regulating valve can also be set on the fourth pipeline 6 to control the start and stop of the low-pressure gray water entering the filtrate receiving tank 2 and even the rate.

[0046] Further, see Attachment Figure 3 In the water-coal slurry gasification process system provided in this embodiment, in a specific implementation, a first ball valve 31 and a first blind plate 32 are provided at one end of the third pipeline 3 facing the inlet end of the first pipeline 4, and the first ball valve 31 and the first blind plate 32 are arranged in sequence along the liquid flow direction in the third pipeline 3.

[0047] Specifically, in order to ensure that the diversion state of the low-pressure gray water in the third pipeline 3 is controllable, a first ball valve 31 and a first blind plate 32 are provided in the present embodiment. The first blind plate 32 may be, but is not limited to, an 8-shaped blind plate, so as to improve the convenience and efficiency of operation and prevent the blind plate from being lost and difficult to keep due to repeated disassembly. The cooperation of the first ball valve 31 and the first blind plate 32 can start and stop the low-pressure gray water in the first pipeline 4 from entering the third pipeline 3 according to actual needs, and can also adjust the rate at which the low-pressure gray water enters the third pipeline 3. In the present embodiment, the first ball valve 31 and the first blind plate 32 can be used as a common valve body for the third pipeline 3 and the fourth pipeline 6 to simplify the system structure and the operating process. For details, please refer to the attached Figure 3 The fourth pipeline 6 is connected to the third pipeline 4 at the front end of the first blind plate 32 on the third pipeline 4 to achieve parallel connection.

[0048] Furthermore, the water-coal slurry gasification process system provided in this embodiment, in a specific implementation, also includes a controller (not shown in the figure); a liquid level meter (not shown in the figure) is provided at a specified height in the filtrate receiving tank 2, and the liquid level meter is connected to the controller signal to send an in-place signal to the controller; a stop valve 33 is provided on the third pipeline 3, and the stop valve 33 is connected to the controller signal, and the controller controls the closing of the stop valve 33 according to the in-place signal.

[0049] Specifically, in order to accurately control the rate of low-pressure ash water entering the filtrate receiving tank 2 and avoid abnormal liquid supply to the coal mill from the filtrate receiving tank 2, a controller, a liquid level gauge and a stop valve 33 are provided in this embodiment; the controller is a PLC controller capable of data transmission, processing, analysis, comparison and program editing; the number and position of the liquid level gauges in this embodiment can be designed and adjusted according to actual needs, for example: liquid level gauges are simultaneously provided at positions of 70%-80% in the height direction of the filtrate receiving tank 2 to limit the liquid level range in the filtrate receiving tank 2, and a response arrival signal is sent to the controller when the liquid level is lower than 70% or higher than 80%. When the liquid level is lower than 70%, it indicates that the fluid capacity in the filtrate receiving tank 2 is insufficient, the second water pump 21 is prone to empty pumping, and the coal mill may be disconnected. At this time, the controller controls the stop valve 33 to open, and the opening degree can be controlled according to the preset; when the liquid level is higher than 80%, it indicates that there is too much fluid in the filtrate receiving tank 2 and overflow may occur. At this time, the controller controls the stop valve 33 to close or reduce the opening degree. Of course, only one level gauge can be set for a special location, which will not be elaborated here.

[0050] Further, see Attachment Figure 3 In the specific implementation of the water-coal slurry gasification process system provided in this embodiment, a front hand valve 34 and a rear hand valve 35 are respectively provided before and after the stop valve 33 on the third pipeline 3.

[0051] Specifically, in order to facilitate the rapid removal or maintenance of the stop valve 33, the present embodiment is provided with a front hand valve 34 and a rear hand valve 35, both of which are ball valve structures, and the conduction before and after the stop valve 33 is realized by manual adjustment. In the present embodiment, when the stop valve 33 needs to be replaced or removed for maintenance, the low-pressure gray water entering and exiting the stop valve 33 can be cut off by controlling the front hand valve 34 and the rear hand valve 35, so as to realize rapid and convenient replacement or removal and maintenance, and prevent the influence of the low-pressure gray water at the front and rear ends, thereby improving the replacement or maintenance efficiency; the front hand valve 34 and the rear hand valve 35 can also improve the accuracy of the conduction and even the flow rate control of the low-pressure gray water on the third pipeline 3, and avoid the failure of the stop valve 33 affecting the liquid supply condition.

[0052] Further, see Attachment Figure 3 The water-coal slurry gasification process system provided in this embodiment, in a specific implementation, further includes a fifth pipeline 7; the two ends of the fifth pipeline 7 are respectively connected to the front and rear ends of the stop valve 33 on the third pipeline 3, and a bypass valve 71 is provided on the fifth pipeline 7.

[0053] Specifically, in order to facilitate the replacement and maintenance of the stop valve 33, the front hand valve 34 and the rear hand valve 35 on the third pipeline 3, a fifth pipeline 7 is provided in the present embodiment. The fifth pipeline 7 is a rigid pipeline, which is connected in parallel with the 3 sections of the third pipeline corresponding to the stop valve 33, the front hand valve 34 and the rear hand valve 35. Therefore, when the 3 sections of the third pipeline corresponding to the stop valve 33, the front hand valve 34 and the rear hand valve 35 have problems or the stop valve 33, the front hand valve 34 and the rear hand valve 35 have problems and need to be replaced or repaired, the 3 sections of the third pipeline corresponding to the stop valve 33, the front hand valve 34 and the rear hand valve 35 can be closed and the fifth pipeline 7 can be started, so as to ensure the passage between the gray water tank 1 and the filtrate receiving tank 2 while replacing or repairing the stop valve 33, the front hand valve 34 and the rear hand valve 35. The bypass valve 71 is a ball valve type valve body structure, through which the low-pressure grey water can be started and stopped from entering the fifth pipeline 7 and the flow rate of the low-pressure grey water in the fifth pipeline 7 can be adjusted.

[0054] Further, see Attachment Figure 3 In the specific implementation of the water-coal slurry gasification process system provided in this embodiment, a first shower valve 36 is provided at the lowest point of the third pipeline 3.

[0055] Specifically, in order to increase the service life of the third pipeline 3 and even the entire system, a first drain valve 36 is provided in this embodiment. The first drain valve 36 is provided at the lowest point of the third pipeline 3 to discharge residual liquid, sediment, impurities, etc. in the third pipeline 3 and reduce the scaling of the third pipeline 3. Figure 4 A second shower guide 61 may also be provided at the lowest point on the fourth pipeline 6 to discharge residual liquid, precipitation, impurities, etc. in the fourth pipeline 6 to reduce scaling of the fourth pipeline 6 .

[0056] Further, see Attachment Figure 4 In the water-coal slurry gasification process system provided in this embodiment, in a specific implementation, a second ball valve 62 and a second blind plate 63 are provided on one end of the fourth pipeline 6 facing the inlet end of the first pipeline 4 .

[0057] Specifically, in order to achieve controllable fluid in the fourth pipeline 6, in this embodiment, a second ball valve 62 and a second blind plate 63 are sequentially arranged along the fluid direction of the fourth pipeline 6, and the second blind plate 63 can be, but is not limited to, an 8-shaped blind plate. The cooperation of the second ball valve 62 and the second blind plate 63 can control the start and stop of the low-pressure fluid in the fourth pipeline 6 to the outlet of the second water pump 21 and the flow rate. The second ball valve 62 is as close as possible to the first ball valve 31 to reduce the possibility of scaling of the fourth pipeline 6. Of course, in the same way, in this embodiment, the front hand valve 34 is also as close as possible to the first ball valve 31 to reduce the possibility of scaling of the third pipeline 3.

[0058] Further, see Attachment Figure 4 In the specific implementation of the water-coal slurry gasification process system provided in this embodiment, a third ball valve 64 is provided on one end of the fourth pipeline 6 facing the outlet end of the second pipeline 5 .

[0059] Specifically, in order to improve the controllability of the fourth pipeline 6, a third ball valve 64 is provided in the present embodiment. The third ball valve 64 can start and stop the conduction of low-pressure grey water to the outlet end of the second water pump 21 at the end of the fourth pipeline 6 and adjust the rate, so as to cooperate with the second ball valve 62 to improve the controllability. At the same time, if one of them fails, the controllability can be guaranteed by the other one.

[0060] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A water-coal slurry gasification process system, characterized in that: include: A grey water tank, the grey water tank is used to store low-pressure grey water, the grey water tank is externally connected to a first pipeline, the first pipeline is used to lead the low-pressure grey water to a sewage treatment unit; A filtrate receiving tank, the filtrate receiving tank is used to store raw water and filtrate, a second pipeline is led out of the filtrate receiving tank, and the second pipeline is used to connect to the coal mill and replenish liquid to the coal mill; The third pipeline has two ends connected to the inlet end of the first pipeline and the filtrate receiving tank respectively, so as to introduce at least part of the low-pressure grey water in the first pipeline into the filtrate receiving tank at a specified flow rate.

2. The water-coal slurry gasification process system according to claim 1, characterized in that: The invention also includes a fourth pipeline, which is connected in parallel with the third pipeline between the inlet end of the first pipeline and the outlet of the filtrate receiving tank, so that the third pipeline and / or the fourth pipeline introduces at least part of the low-pressure gray water in the first pipeline into the filtrate receiving tank at a specified flow rate.

3. The water-coal slurry gasification process system according to claim 1, characterized in that: A first ball valve and a first blind plate are disposed at one end of the third pipeline facing the inlet end of the first pipeline, and the first ball valve and the first blind plate are sequentially disposed along the flow direction of the liquid in the third pipeline.

4. The water-coal slurry gasification process system according to claim 1, characterized in that: Also includes a controller; A liquid level meter is provided at a specified height in the filtrate receiving tank, and the liquid level meter is connected to the controller signal to send a level signal to the controller; The third pipeline is provided with a stop valve, and the stop valve is connected to the controller signal. The controller controls the shutoff of the stop valve according to the in-place signal.

5. The water-coal slurry gasification process system according to claim 4, characterized in that: A front hand valve and a rear hand valve are respectively provided before and after the stop valve on the third pipeline.

6. The water-coal slurry gasification process system according to claim 4, characterized in that: Also included is a fifth pipeline; Two ends of the fifth pipeline are respectively connected to the front and rear ends of the stop valve on the third pipeline, and a bypass valve is provided on the fifth pipeline.

7. The water-coal slurry gasification process system according to claim 1, characterized in that: A first shower valve is provided at the lowest point of the third pipeline; The first pipeline is provided with a first water pump; The third pipeline is connected between the first water pump and the outlet end of the first pipeline.

8. The water-coal slurry gasification process system according to claim 2, characterized in that: A second ball valve and a second blind plate are provided on one end of the fourth pipeline facing the inlet end of the first pipeline.

9. The water-coal slurry gasification process system according to claim 8, characterized in that: A third ball valve is provided on one end of the fourth pipeline facing the outlet end of the second pipeline.

10. The water-coal slurry gasification process system according to claim 9, characterized in that: A second shower valve is provided at the lowest point of the fourth pipeline; The second pipeline is provided with a second water pump; The outlet end of the fourth pipeline is connected to the outlet end of the second water pump.

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