Coal chemical industry slag water treatment system

Abstract

The utility model provides a coal chemical industry slag water treatment system which comprises a flash tank, a high-temperature black water pipeline of which the inlet end is connected with the bottom of the flash tank, a flash angle valve connected to the outlet end of the high-temperature black water pipeline, and a low-temperature grey water pipeline of which the inlet end is connected with a grey water tank, the grey water introducing pipeline is communicated with the high-temperature black water pipeline and the low-temperature grey water pipeline, and low-temperature grey water in the low-temperature grey water pipeline is introduced into the high-temperature black water pipeline through the grey water introducing pipeline. According to the coal chemical industry slag water treatment system, low-temperature grey water in the system is injected into high-temperature black water, so that the purpose of cooling the black water is achieved, the analysis of non-condensable gas of the black water in a pipeline is avoided, and the problems of black water pipeline abrasion, angle valve vibration and the like are solved; the coal chemical slag water treatment system completely utilizes a medium in water circulation of the system, so that the influence on water balance of the system is avoided; the system does not need additional dynamic equipment and pressure vessels, and is extremely low in input cost, small in construction difficulty and short in construction period.

Description

Technical Field

[0001] The utility model relates to the field of coal chemical industry, in particular to a coal chemical slag water treatment system. Background Art

[0002] Black water flash angle valves are widely used in the coal chemical industry, especially in the coal chemical gasification unit for the black water medium of water-coal slurry and pulverized coal gasification process. The high-flash, low-flash and true-flash containers of the slag water treatment unit of the coal gasification unit are arranged at the same height. During the transportation process of the black water at the bottom of the high-flash and low-flash, the high-temperature black water pipeline is transported from the lower floors to the higher floors. During the transportation climbing process, the black water pressure gradually decreases, causing the non-condensable gas in the black water to gradually decompose. Before entering the black water flash angle valve, the black water is already a gas, liquid and solid three-phase flow medium, which flushes the high-temperature black water pipeline, causing it to thin and leak. In addition, the black water containing non-condensable gas generates great vibration when passing through the angle valve, causing large fluctuations in the valve position, hitting sounds in the tank, wear of the angle valve core, and flushing of the tank, resulting in the breakage of the angle valve feedback rod, short service life of the angle valve, and easy leakage of the tank. Utility Model Content

[0003] In order to solve the above technical problems, the utility model proposes a coal chemical slag water treatment system.

[0004] The coal chemical slag water treatment system of the present invention includes a flash tank, a high-temperature black water pipeline whose inlet end is connected to the bottom of the flash tank, a flash angle valve connected to the outlet end of the high-temperature black water pipeline, and a low-temperature gray water pipeline whose inlet end is connected to the gray water tank of the system. It also includes a gray water introduction pipeline connecting the high-temperature black water pipeline and the low-temperature gray water pipeline, and the low-temperature gray water in the low-temperature gray water pipeline is introduced into the high-temperature black water pipeline through the gray water introduction pipeline.

[0005] In one embodiment, the outlet end of the grey water inlet pipeline is located at the upstream end of the flash angle valve.

[0006] In one embodiment, the flash tank includes a high flash tank, the inlet end of the high temperature black water pipeline is connected to the bottom of the high flash tank body, and the outlet end of the low temperature gray water pipeline is connected to the upper part of the high flash tank body.

[0007] In one embodiment, the flash tank body further includes a low flash tank and a true flash tank connected downstream of the flash angle valve.

[0008] In one embodiment, gray water inlet pipelines connecting the high-temperature black water pipeline and the low-temperature gray water pipeline are respectively provided at the upstream ends of the flash angle valve upstream of the low flash tank and the upstream ends of the flash angle valve upstream of the true flash tank.

[0009] In one embodiment, the grey water inlet pipeline is connected to the high-temperature black water pipeline through a mixing nozzle to allow the low-temperature grey water to be quickly mixed with the high-temperature black water.

[0010] In one embodiment, the grey water inlet pipeline is provided with a stop valve for adjusting the replenishment amount of the grey water.

[0011] In one embodiment, the gray water inlet pipeline includes a first straight segment connected to the high-temperature black water pipeline and extending upward perpendicularly to the high-temperature black water pipeline, and a second straight segment connected to the low-temperature gray water pipeline and extending perpendicularly to the first straight segment, and the first straight segment and the second straight segment are connected by a bend pipe.

[0012] In one embodiment, the grey water inlet pipeline is a DN80 or CL150 pipeline, and the elbow is a DN80 or CL150 elbow.

[0013] In one embodiment, the stop valve is a DN80 or CL150 stop valve.

[0014] Compared with the existing technology, the coal chemical slag water treatment system of the present invention utilizes its own process to inject low-pressure gray water with the lowest temperature in the system water circulation into the high-temperature black water, thereby achieving the purpose of cooling the black water and avoiding the decomposition of non-condensable gas in the black water in the pipeline; the coal chemical slag water treatment system of the present invention does not need to add additional dynamic equipment and pressure vessels, has low investment cost, low construction difficulty, short construction period, and saves energy and cost; the coal chemical slag water treatment system of the present invention fully utilizes the medium in the system water circulation, no longer requires circulating water for cooling, and instead uses low-temperature gray water for cooling, realizing the graded utilization of low-temperature gray water, saving the amount of circulating water, and avoiding affecting the water balance of the system. It is used in the black water flash evaporation system of the coal chemical device, and has a significant effect on the vibration elimination of the black water flash evaporation angle valve, eliminating problems such as black water pipeline wear, angle valve vibration, large valve position fluctuation, and cylinder impact sound, and delaying problems such as angle valve valve core wear, cylinder scouring and leakage.

[0015] The above technical features can be combined in various technically feasible ways to produce new implementation plans, as long as the purpose of the present invention can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be described in more detail below based on non-limiting embodiments and with reference to the accompanying drawings, wherein:

[0017] Figure 1 A simplified schematic diagram of a coal chemical slag water treatment system according to the present invention is shown.

[0018] Figure 2 Shown is a structural schematic diagram of a coal chemical slag water treatment system according to the present utility model.

[0019] In the drawings, like components are designated by like reference numerals, but the drawings are not necessarily drawn to scale.

[0020] Wherein, the accompanying drawings are marked as follows:

[0021] 1. High-temperature black water pipeline; 11. Pressure-reducing outlet end of high-temperature black water pipeline; 2. Low-temperature gray water pipeline; 21. Outlet end of low-temperature gray water pipeline; 3. Gray water inlet pipeline; 31. First straight segment; 32. Second straight segment; 33. Stop valve; 34. Mixing nozzle; 4. Flash angle valve; 5. True flash tank; 6. Low flash tank; 7. High flash tank. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, as long as no conflict arises, the various embodiments and features of the present invention can be combined with each other, and the resulting technical solutions are all within the scope of protection of the present invention.

[0023] Parts not described in the present invention can be realized by adopting or drawing on existing technologies.

[0024] In the existing technology, the high-flash, low-flash and true-flash containers of the slag water treatment unit of the coal gasification device are arranged at the same height. During the transportation of the black water at the bottom of the high-flash and low-flash, since the high-temperature black water pipeline is transported from the lower layer to the higher layer, the black water pressure gradually decreases during the transportation climbing process, causing the non-condensable gas in the black water to gradually decompose. Before entering the black water flash evaporation angle valve, the black water is already a three-phase flow medium of gas, liquid and solid, which flushes the high-temperature black water pipeline, causing the high-temperature black water pipeline to thin and leak.

[0025] In order to solve this problem, the coal chemical slag water treatment system of the present invention includes a flash tank, a high-temperature black water pipeline 1 whose inlet end is connected to the bottom of the flash tank, a flash angle valve 4 connected to the pressure reduction outlet end 11 of the high-temperature black water pipeline, and a low-temperature gray water pipeline 2 whose inlet end is connected to the system gray water tank, wherein a gray water inlet pipeline 3 connecting the high-temperature black water pipeline 1 and the low-temperature gray water pipeline 2 is arranged between the high-temperature black water pipeline 1 and the low-temperature gray water pipeline 2, and the low-temperature gray water in the low-temperature gray water pipeline 2 is introduced into the high-temperature black water pipeline 1 through the gray water inlet pipeline 3.

[0026] The low-temperature, low-pressure gray water in the low-temperature gray water pipeline 2 comes from the system itself. It is formed by flash evaporation and sedimentation of high-temperature black water in the system, clarification in the clarifier tank, and separation. The formed gray water flows into the gray water tank for storage.

[0027] The coal chemical slag water treatment system of the present invention injects low-temperature gray water in the system into high-temperature black water, thereby reducing the black water temperature to below the saturation temperature corresponding to the highest black water pressure, avoiding the phenomenon of non-condensable gas analysis, thereby eliminating the problems of wear of the black water pipeline by the high-temperature black water and vibration of the angle valve; the coal chemical slag water treatment system fully utilizes the medium in the system water circulation, no longer requires circulating water for cooling, and uses low-temperature gray water for cooling instead, realizing the graded utilization of low-temperature gray water, saving the use of circulating water, and avoiding affecting the water balance of the system; at the same time, the system does not need to add additional dynamic equipment and pressure vessels, the investment cost is extremely low, the construction difficulty is small, the construction period is short, and energy and expenses are saved.

[0028] In an optional embodiment, the outlet end of the gray water inlet pipeline 3 is located upstream of the flash angle valve 4. Before the high-temperature black water enters the flash angle valve 4, the introduction of low-temperature gray water lowers the black water temperature to below the saturation temperature corresponding to the highest black water pressure, thereby preventing non-condensable gas desorption. This eliminates problems such as black water pipeline wear, angle valve vibration, large valve position fluctuations, and cylinder impact noise caused by non-condensable gas desorption, thereby delaying wear of the angle valve core.

[0029] In an optional embodiment, the flash tank includes a high-temperature flash tank 7. The inlet end of the high-temperature black water pipeline 1 is connected to the bottom of the high-temperature flash tank 7, and the outlet end 21 of the low-temperature gray water pipeline 2 is connected to the top of the high-temperature flash tank 7. Gray water from the low-temperature gray water pipeline 2 is injected into the high-temperature flash tank 7 to recover true flash heat and wash flash gas. The gray water inlet pipeline 3 at the outlet end of the low-temperature gray water pipeline 2 is connected to the high-temperature black water pipeline 1 at the bottom of the high-temperature flash tank 7 to reduce the temperature of the black water in the high-temperature black water pipeline 1 to below the saturation temperature corresponding to the highest black water pressure. (For example, the high-temperature black water flowing out of the high-temperature flash tank at 192°C is reduced to 1.06 MPa before entering the flash angle valve 4, and the corresponding saturation temperature is reduced to 187°C.)

[0030] In an optional embodiment, the coal chemical slag water treatment system further includes a low flash tank and a true flash tank connected to the downstream of the flash angle valve. Figure 2 As shown, the black water in the high-temperature black water pipeline 1 flows through the flash angle valve 4 into the low-flash tank 6 or the true flash tank 5 and converges at the bottom of the low-flash tank 6 or the true flash tank 5. At the same time, because the black water converges at the bottom of the low-flash tank 6 or the true flash tank 5, it can act as a buffer, reducing the impact of non-condensable gases on the flash tank, reducing the sound of the tank body hitting the tank body and the scouring of the non-condensable gases on the tank body, thereby preventing the tank body from leaking.

[0031] In an optional embodiment, a gray water inlet pipeline 3 connecting the high-temperature black water pipeline 1 and the low-temperature gray water pipeline 2 is respectively provided at the upstream end of the flash angle valve 4 upstream of the low flash tank 6 and the upstream end of the flash angle valve 4 upstream of the true flash tank 5.

[0032] like Figure 2 As shown, the gray water inlet pipeline 3 introduces low-temperature gray water into high-temperature black water at the upstream ends of the flash angle valve 4 upstream of the low-flash tank 6 and the flash angle valve 4 upstream of the true flash tank 5, respectively. Before the black water passes through the flash angle valve 4 upstream of the low-flash tank 6 and the true flash tank 5, it is cooled to below the corresponding saturation temperature (for example, the high-temperature black water flowing out of the low-flash tank 6 at 137°C is pressure-reduced to 0.15 MPa and the corresponding saturation temperature to 127°C before flowing into the flash angle valve 4). This prevents non-condensable gas desorption and reduces vibration and wear of the flash angle valve by the high-temperature black water, thereby extending the service life of the flash angle valve 4. The high-temperature black water flowing out of the high-flash tank 7 is cooled and then flows into the low-flash tank 6 for low-flash flash. After low-flash flash, the high-temperature black water flows out from the bottom of the low-flash tank 6. After further cooling by the low-temperature gray water, it flows into the true flash tank 5 and finally flows out from the bottom of the true flash tank 5 as low-temperature black water.

[0033] In an optional embodiment, the gray water inlet line 3 is connected to the high-temperature black water line 1 via a mixing nozzle 34 to enable rapid mixing of the low-temperature gray water and the high-temperature black water. The low-temperature gray water is injected into the higher-temperature black water via the mixing nozzle 34, allowing the gray water and black water to mix thoroughly and controlling the black water temperature to below the saturation temperature at the corresponding pressure.

[0034] In an optional embodiment, a shutoff valve 33 is installed on the gray water inlet pipeline 3 to adjust the amount of gray water added. This shutoff valve allows for timely and rational adjustment of the low-temperature gray water supply, proper control of the black water temperature, and prevention of non-condensable gas desorption. Alternatively, the shutoff valve 33 can be a DN80 (outer diameter 88.9 mm) or CL150 (20 MPA) shutoff valve.

[0035] In an optional embodiment, if Figure 1 As shown, the grey water inlet pipeline 3 includes a first straight segment 31 connected to the high-temperature black water pipeline 1 and extending upward perpendicularly to the high-temperature black water pipeline 1, and a second straight segment 32 connected to the low-temperature grey water pipeline 2 and extending perpendicularly to the first straight segment 31. The first straight segment 31 and the second straight segment 32 are connected by a bend. Figure 1 As shown, the second straight section 32 is spatially arranged parallel to the high-temperature black water pipeline 1 .

[0036] Optionally, the grey water inlet pipeline 3 may be a DN80 or CL150 pipeline, and the elbow may be a DN80 or CL150 elbow.

[0037] Due to thermal expansion and contraction, pipelines may experience localized excessive stress, leading to accidents such as pipeline tearing. Thermal expansion and temperature stress can also easily cause pipeline deformation or damage. Therefore, the first straight segment 31 and the second straight segment 32 of the graywater inlet pipeline 3 are arranged perpendicular or parallel to the extension direction of the blackwater pipeline. The first and second straight segments 31, 32 are connected by an elbow to offset expansion forces and eliminate stress caused by thermal expansion and contraction.

[0038] In summary, the coal chemical slag water treatment system of the present invention utilizes its own process to inject low-pressure gray water with the lowest water circulation temperature in the system into high-temperature black water, so as to achieve the purpose of cooling the black water, thereby avoiding the analysis of non-condensable gas in the black water in the pipeline, eliminating the problems of black water pipeline wear, angle valve vibration, large valve position fluctuation, cylinder impact sound, etc. caused by non-condensable gas analysis, thereby delaying the wear of the angle valve core; the coal chemical slag water treatment system fully utilizes the medium in the system water circulation, and no longer requires circulating water for cooling, but uses low-temperature gray water for cooling instead, realizing the graded utilization of low-temperature gray water, saving the use of circulating water, and avoiding affecting the water balance of the system; at the same time, the system does not need to add additional dynamic equipment and pressure vessels, the investment cost is extremely low, the construction difficulty is small, the construction period is short, and energy and costs are saved.

[0039] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by persons of ordinary skill in the field to which this utility model belongs. The terms "include" or "comprise" and similar words used in this utility model mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. In the description of this utility model, the orientation or position relationship indicated by the terms "vertical", "perpendicular" and the like is based on the orientation or position relationship shown in the accompanying drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. When the absolute position of the described object changes, the relative position relationship may also change accordingly, and therefore cannot be understood as a limitation to this utility model.

[0040] At this point, those skilled in the art will recognize that while the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present invention. In particular, the various technical features described in the various embodiments may be combined in any manner, provided there are no structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A coal chemical slag water treatment system, characterized in that: The coal chemical slag water treatment system includes a flash tank, a high-temperature black water pipeline connected to the bottom of the flash tank at its inlet end, a flash angle valve connected to the outlet end of the high-temperature black water pipeline, and a low-temperature gray water pipeline connected to the gray water tank of the system at its inlet end, wherein, it also includes a gray water inlet pipeline connecting the high-temperature black water pipeline and the low-temperature gray water pipeline, and the low-temperature gray water in the low-temperature gray water pipeline is introduced into the high-temperature black water pipeline through the gray water inlet pipeline.

2. The coal chemical slag water treatment system according to claim 1, characterized in that: The outlet end of the grey water introduction pipeline is located at the upstream end of the flash angle valve.

3. The coal chemical slag water treatment system according to claim 2, characterized in that: The flash tank includes a high flash tank, the inlet end of the high temperature black water pipeline is connected to the bottom of the high flash tank, and the outlet end of the low temperature gray water pipeline is connected to the upper part of the high flash tank.

4. The coal chemical slag water treatment system according to claim 3, characterized in that: The flash tank includes a low flash tank and a true flash tank connected downstream of the flash angle valve.

5. The coal chemical slag water treatment system according to claim 4, characterized in that: Gray water inlet pipelines connecting the high-temperature black water pipeline and the low-temperature gray water pipeline are respectively provided at the upstream ends of the flash angle valve upstream of the low flash tank and the upstream ends of the flash angle valve upstream of the true flash tank.

6. The coal chemical slag water treatment system according to claim 5, characterized in that: The grey water inlet pipeline is connected to the high-temperature black water pipeline through a mixing nozzle to allow low-temperature grey water to be quickly mixed with high-temperature black water.

7. The coal chemical slag water treatment system according to claim 1, characterized in that: The grey water inlet pipeline is provided with a stop valve for adjusting the replenishment amount of the low-temperature grey water.

8. The coal chemical slag water treatment system according to claim 1, characterized in that: The gray water inlet pipeline includes a first straight segment connected to the high-temperature black water pipeline and extending upward perpendicularly to the high-temperature black water pipeline, and a second straight segment connected to the low-temperature gray water pipeline and extending perpendicularly to the first straight segment. The first straight segment and the second straight segment are connected by a bend pipe.

9. The coal chemical slag water treatment system according to claim 8, characterized in that: The grey water inlet pipeline is a DN80, CL150 pipeline, and the elbow is a DN80, CL150 elbow.

10. The coal chemical slag water treatment system according to claim 7, characterized in that: The stop valve is a DN80 or CL150 stop valve.

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