Coal gasification chilling water filtering system

Abstract

The invention relates to the field of coal gasification chilled water, in particular to a coal gasification chilled water filtering system which comprises at least two filter bodies connected into a coal gasification chilled water system and arranged in parallel, and each filter body comprises a shell, a V-shaped sieve plate, a sieve plate flushing assembly and a shell flushing assembly. According to the coal gasification chilled water filtering system, on-line automatic dual cleaning of the filter body can be achieved, under the condition that normal operation of the filtering system is not affected, high-pressure grey water of a coal gasification grey water system is used for cleaning the sieve plate from the upper portion through the top flushing spray head, the inner wall of the shell is flushed through the combination of the side flushing pipe, and the filtering effect is good. The flushing effect of the filter body is improved, the service life of the filter body is prolonged, recycling of the filter body is achieved, the problems that at present, ash blocks the filter, chilled water supply is insufficient, and a gasification furnace cannot operate for a long period are solved, the working intensity of workers is reduced, and the production investment cost is saved.

Description

Technical Field

[0001] The invention relates to the field of coal gasification quenching water, in particular to a coal gasification quenching water filtering system. Background Art

[0002] With the rapid development of my country's coal chemical industry, my country has become the world's leading country in water-coal slurry technology, with the largest production capacity and the most extensive application industries. At present, my country has the largest number of gasifiers using coal gasification technology and the largest scale of use. The representative technologies mainly include Texace water-coal slurry gasification, multi-nozzle opposed water-coal slurry gasification, Tsinghua furnace water-cooled wall water-coal slurry gasification and some pulverized coal gasification.

[0003] However, the above coal gasification process technologies all adopt a quenching ring with a downcomer to guide the high-temperature synthesis gas from the combustion chamber of the gasifier into the quenching water of the quenching chamber of the gasifier for a water bath. The water bath of the synthesis gas not only removes most of the ash, but also reduces the temperature of the synthesis gas, so that the temperature of the synthesis gas out of the gasifier is below the required temperature of the pipeline material. In order to prevent the high-temperature synthesis gas from burning the downcomer, the quenching water is passed through the quenching ring and the downcomer. The quenching water sent by the quenching water pump passes through the quenching water filter to filter out large particles and enter the quenching ring. The distributor then evenly distributes the quenching water on the downcomer to form a water film of a certain thickness, which is used to separate the synthesis gas from the downcomer and prevent the high-temperature synthesis gas from directly contacting the downcomer and burning the downcomer. The water hole of the currently used quenching ring has a small hole with a diameter of 10mm, and the gap of the distributor is only 6-8mm. In order to prevent the ash in the quenching water from clogging the quenching ring and the distributor, a quenching water filter is set on the quenching water inlet pipeline.

[0004] At present, there are two types of filters used in the chilled water system. One is an ordinary column filter. The filter element of this filter is similar to a basket. All surfaces of the screen basket are provided with circular screen holes with a diameter of 6 mm. The upper water of the chilled water enters from the upper part of the filter and the back of the high side of the screen basket. After filtration, the clean water passes through the center of the screen basket and exits the filter through the lower side of the screen basket. However, this filter is not easy to backwash, and the dust accumulated over a long period of use is not easy to remove. It is inconvenient to inspect and disassemble it. During the long-term operation of the gasifier, when the water quality is poor, the filter is blocked by ash, resulting in insufficient supply of chilled water, and the gasifier cannot achieve long-term operation. The other is a horizontal sieve plate filter. The sieve plate of this filter is a plane. There are 6mm sieve holes on the top, and the sieve plate in the entire filter is composed of 3-4 sieve plates spliced ​​together. The quenching water enters from the lower side of the filter sieve plate, and the water passes through the sieve plate from the bottom and exits the filter from the upper part of the sieve plate. However, during the operation of the sieve plate, as ash accumulates, the sieve plate is easily deformed and has a short service life due to the differential pressure between the inlet and outlet water. This affects the use of the filter and increases the maintenance cost. Even if the filter is equipped with backwash water, the backwash water is introduced from the top diameter, the water flow area is limited, and the water pressure is limited. The flushing effect is poor each time, the pressure difference is high after commissioning, and the ash is not easy to discharge, resulting in a short service life of the filter and insufficient quenching water in the later period, which restricts the long-term operation of the gasifier.

[0005] Based on this, a quenching water filtration system with good flushing effect is urgently needed to maintain the long-term operation of the gasifier. Summary of the invention

[0006] The purpose of the present invention is to provide a coal gasification quenching water filtration system, which can realize online automatic double cleaning of the filter body without affecting the normal operation of the filtration system. By utilizing the high-pressure ash water of the coal gasification ash water system to clean the sieve plate from above with the help of the top flushing nozzle, and combining the side flushing pipe to flush the inner wall of the shell, the flushing effect and service life of the filter body are improved, the recycling of the filter body is realized, and the current problem of ash clogging the filter, resulting in insufficient quenching water supply, and the inability of the gasifier to achieve long-term operation is solved, the work intensity of personnel is reduced, and the production investment cost is saved.

[0007] In order to solve the above technical problems, the present invention provides a coal gasification quenching water filtration system, comprising at least two filter bodies connected to the coal gasification quenching water system and arranged in parallel, each of the filter bodies comprising a shell, a V-shaped sieve plate, a sieve plate flushing assembly and a shell flushing assembly, a quenching water outlet and a quenching water inlet are respectively provided on the side walls of the shell, and a sewage outlet is provided at the bottom, the quenching water outlet is located above the quenching water inlet, and the V-shaped sieve plate is installed between the quenching water outlet and the quenching water inlet;

[0008] The sieve plate flushing assembly comprises a top flushing pipe, a flushing nozzle and a first flushing pipe, wherein the top flushing pipe is passed through the top of the shell, the flushing nozzle is movably installed under the top flushing pipe through a ferrule assembly and is connected thereto, one end of the first flushing pipe is connected to the top flushing pipe, and the other end is connected to high-pressure ash water of a coal gasification ash water system, and a first flushing valve is provided on the first flushing pipe;

[0009] The shell flushing assembly includes a side flushing pipe and a second flushing pipe. The side flushing pipe is opened on the side wall of the shell on one side of the V-shaped screen plate. The second flushing pipe is connected to the side flushing pipe, and a second flushing valve is provided on the second flushing pipe.

[0010] Preferably, the ferrule assembly comprises a first ferrule and a second ferrule which are symmetrically arranged, the first ferrule is arranged at the lower end of the top flushing pipe extending downward into the housing, and the second ferrule is connected to the first ferrule by a fastener with a gasket arranged therebetween;

[0011] The flushing nozzle includes an upper part, a middle part and a lower part which are connected in sequence from top to bottom, the upper part is located in the first ferrule and the second ferrule, and the inner cavities of the second ferrule and the first ferrule form a movable space for the upper part to move up and down, the outer diameter of the upper part is greater than the outer diameter of the middle part, the second ferrule is arranged on the outside of the middle part, the middle part is cylindrical, the lower part is inverted cone shape and a plurality of flushing holes are opened on its outer wall.

[0012] Preferably, the plurality of flushing holes include a first layer of flushing holes, a second layer of flushing holes and a bottom flushing hole arranged from top to bottom, the first layer of flushing holes and the second layer of flushing holes respectively have a plurality of flushing holes and are evenly distributed on the outer peripheral wall of the lower portion, the first layer of flushing holes and the second layer of flushing holes are both obliquely arranged, and the bottom flushing holes are vertically arranged toward the V-shaped screen plate.

[0013] Preferably, the cone angle of the lower part of the flushing nozzle is 90°; the first layer of flushing holes has three flushing holes, namely flushing hole 1, flushing hole 2 and flushing hole 3, the angle of flushing hole 1 is 0° in the X-axis direction, 30° counterclockwise offset in the Y-axis direction, and 151° to 168° clockwise offset in the Z-axis direction; the angle of flushing hole 2 is 120° in the X-axis direction, 30° counterclockwise offset in the Y-axis direction, and 151° to 168° clockwise offset in the Z-axis direction; the angle of flushing hole 3 is 240° in the X-axis direction, 30° counterclockwise offset in the Y-axis direction, and 151° to 168° clockwise offset in the Z-axis direction;

[0014] The second layer of flushing holes has three flushing holes, namely flushing hole four, flushing hole five and flushing hole six. The angle of flushing hole four is offset 60° counterclockwise in the X-axis direction, 30° counterclockwise in the Y-axis direction, and 167° to 177° clockwise in the Z-axis direction; the angle of flushing hole five is offset 180° counterclockwise in the X-axis direction, 30° counterclockwise in the Y-axis direction, and 167° to 177° clockwise in the Z-axis direction; the angle of flushing hole six is ​​offset 300° counterclockwise in the X-axis direction, 30° counterclockwise in the Y-axis direction, and 167° to 177° clockwise in the Z-axis direction;

[0015] The bottom flushing hole has a conical hole, and the angle of the conical hole is 176° to 184° clockwise offset from the Z axis.

[0016] Preferably, the first layer of flushing holes are elongated holes with a width of 8 to 10 mm and a length of 25 mm; the second layer of flushing holes are elongated holes with a width of 8 to 10 mm and a length of 20 mm; the upper diameter of the conical hole of the bottom flushing hole is 8 to 10 mm.

[0017] Preferably, the V-shaped sieve plate is installed in the shell through a fixing bracket, the angle of the V-shaped sieve plate is 90° to 120°, and a plurality of sieve holes are vertically opened on the V-shaped sieve plate.

[0018] Preferably, several of the sieve holes are conical holes, the angle of the conical holes is 20°, the upper hole diameter of the sieve holes is 5 mm, the lower hole diameter is 6 mm, and the gap between two adjacent sieve holes is 6 mm.

[0019] Preferably, the water inlet end of the second flushing pipe is arranged on the first flushing pipe, and a control valve is provided on the pipeline of the water inlet end; a bypass pipe is connected in parallel to the first flushing pipe, and a bypass valve is provided on the bypass pipe.

[0020] Preferably, the distance from the bottom of the flushing nozzle to the center of the V-shaped sieve plate is 1 to 1.2 times the inner diameter of the shell, and a manhole is provided on the side wall of the shell.

[0021] Preferably, the chilled water inlet is connected to an inlet pipe, and a chilled water inlet valve is provided on the water inlet pipe; the chilled water outlet is connected to an outlet pipe, and a chilled water outlet valve is provided on the water outlet pipe; the sewage outlet is connected to a sewage pipe, and a sewage valve is provided on the sewage pipe; the water inlet is provided with an inlet pressure gauge, and the water outlet is provided with an outlet pressure gauge; a pressure difference is formed between the inlet pressure gauge and the outlet pressure gauge, and the pressure difference value is transmitted to the control program PLC, and the PLC controls the operation of the flushing program of the screen plate flushing assembly and the shell flushing assembly.

[0022] Preferably, at least one filter body is run during use. When the pressure difference between the inlet pressure gauge and the outlet pressure gauge during operation reaches the set value, the other filter body is switched to operation, and the corresponding chilled water inlet valve and chilled water outlet valve are opened. After the chilled water flow display returns to normal, the chilled water inlet valve and chilled water outlet valve of the currently running filter body are closed, and the drain valve, the first flushing valve and the second flushing valve are opened to start the flushing procedure.

[0023] The beneficial effects of the present invention are:

[0024] 1. The coal gasification quenching water filtration system of the present invention can realize online automatic double cleaning without affecting the normal operation of the filtration system. The high-pressure ash water of the coal gasification ash water system is used to clean the V-shaped sieve plate from above with the help of the flushing nozzle of the sieve plate flushing assembly, and the inner wall of the shell is flushed in combination with the side flushing pipe of the shell flushing assembly. Under the automatic rotation and pressurization of the high-pressure ash water combined with the flushing nozzle, the flushing effect and service life of the filter body are improved, and the recycling of the filter body is realized, which solves the current problem of ash clogging the filter, resulting in insufficient supply of quenching water, and the inability of the gasifier to achieve long-term operation. The work intensity of personnel is reduced, and the production investment cost of the coal gasification quenching water filtration system of the present invention is saved. In addition, through the overall design of the V-shaped sieve plate, the use intensity of the sieve plate can be improved, the deformation can be reduced, and the service life of the filter body is increased.

[0025] 2. The present invention designs the chilled water outlet above the chilled water inlet, and the V-shaped sieve plate is arranged below the flushing nozzle and between the chilled water outlet and the chilled water inlet. This allows gray water containing solid particles to enter from the lower chilled water inlet of the filter body, and after being filtered through the sieve holes of the V-shaped sieve plate, clearer water flows out of the filter body from the chilled water outlet, wherein the solid particles are precipitated at the bottom of the filter body under the action of their own weight, and are finally discharged from the sewage outlet through the sewage pipe, thereby improving the filtering and sewage discharge performance of the filter body.

[0026] 3. The present invention utilizes high-pressure ash water from the coal gasification ash water system, combined with the structural design of the flushing nozzle and the ferrule assembly, and utilizes the flushing nozzle with a cone angle of 90° and an inverted cone-shaped lower part to open a plurality of obliquely arranged flushing holes. Through the coordination between the first-layer flushing holes, the second-layer flushing holes and the bottom flushing holes at the above-mentioned angles and the V-shaped sieve plate with an angle of 90° to 120°, the flushing water of the first flushing pipe can be pressurized by the multiple flushing holes, the flow rate becomes faster, and the kinetic energy is improved. Under the impact, the V-shaped sieve plate is fully flushed. Combined with the flushing of the inner wall of the shell by the side flushing pipe, the deposited ash can be quickly flushed out of the filter body, thereby improving the filtering effect of the coal gasification quenching water filtration system and the flushing effect of the filter body.

[0027] 4. The present invention adopts a V-shaped sieve plate with an angle of 90° to 120°, which not only increases the filtration area, but also reduces the cross-sectional stress of the sieve plate by 15% to 30%, which can greatly improve the use strength of the sieve plate itself, effectively prevent the deformation of the sieve plate, increase the service life of the sieve plate, and reduce the number of inspections and repairs; and a plurality of sieve holes are vertically opened on the sieve plate, among which a conical sieve hole with an angle of 20° is formed, the upper aperture is 5mm, and the lower aperture is 6mm. This design can prevent particles from passing through the sieve holes, and when the sieve plate is flushed, the particles can be quickly flushed away from the sieve plate.

[0028] 5. The present invention can avoid the situation where ash and slag may enter the flushing nozzle and block the flushing hole when the process quenching water has poor quality and high solid content in the filter body through the design of the bypass pipe and the bypass valve. Specifically, after the filter body is flushed, the first flushing valve is closed and the bypass valve is opened, and the flushing water enters the flushing nozzle through the bypass pipe, so that the flushing nozzle maintains positive pressure operation and prevents the entry of quenching water with a high solid content. It can protect the flushing nozzle, improve the long-term effective operation cycle of the flushing nozzle, as well as the filtering effect of the coal gasification quenching water filtration system and the service life of the filter body.

[0029] 6. The coal gasification quenching water filtration system of the present invention is controlled and operated by a PLC program. When the inlet and outlet pressure difference of the filter body reaches the set value during operation, the switching operation between the filter bodies and the double automatic flushing can be automatically achieved, thereby reducing labor intensity and operating risks, avoiding downtime for inspection and maintenance, and improving operating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solution of the present invention, 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.

[0031] Figure 1 It is a flow chart of the operation of a filter body of the coal gasification quenching water filtration system of the present invention;

[0032] Figure 2 It is a structural schematic diagram of two screen plate angles inside the filter body of the coal gasification quenching water filtration system of the present invention;

[0033] Figure 3 It is a structural schematic diagram of a flushing nozzle of a filter body of a coal gasification quenching water filtration system of the present invention;

[0034] Figure 4 yes Figure 3 Sectional view of AA in the middle;

[0035] Figure 5 yes Figure 3 Cross-sectional view of the middle BB;

[0036] Figure 6 yes Figure 2 A top view of

[0037] In the figure: 1-filter body, 11-shell, 12-flushing nozzle, 13-sieve plate, 14-second flushing pipe, 15-first flushing pipe, 16-drain pipe, 17-water inlet pipe, 18-water outlet pipe, 19-first ferrule, 110-second ferrule, 1101-gasket, 1102-fixing bracket, 1103-bypass pipe, 1104-bypass valve, 1105-manhole, 111-top flushing pipe, 112-drain port, 113-quenching water outlet , 114-quenching water inlet, 115-side flushing pipe, 121-upper part, 122-middle part, 123-lower part, 100-moving space, 1231-first layer flushing hole, 1232-second layer flushing hole, 1233-bottom flushing hole, 141-second flushing valve, 142-control valve, 151-flushing valve, 161-drain valve, 171-quenching water inlet valve, 172-inlet pressure gauge, 181-quenching water outlet valve, 182-outlet pressure gauge. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0039] In a specific embodiment of the present invention, a coal gasification quenching water filtration system includes at least two filter bodies 1 connected to the coal gasification quenching water system and arranged in parallel, such as Figure 1-6 As shown, each filter body 1 includes a shell 11, a V-shaped sieve plate 13, a sieve plate flushing assembly and a shell flushing assembly. A chilled water outlet 113 and a chilled water inlet 114 are respectively provided on the side walls of the shell 11, and a sewage outlet 112 is provided at the bottom. The chilled water outlet 113 is located above the chilled water inlet 114, and the V-shaped sieve plate 13 is installed between the chilled water outlet 113 and the chilled water inlet 114.

[0040] The screen plate flushing assembly includes a top flushing pipe 111, a flushing nozzle 12 and a first flushing pipe 15. The top flushing pipe 111 is arranged on the top of the shell 11. The flushing nozzle 12 is movably installed under the top flushing pipe 111 through a ferrule assembly and is connected with the top flushing pipe 111. One end of the first flushing pipe 15 is connected with the top flushing pipe 111, and the other end is connected with high-pressure ash water of the coal gasification ash water system. The first flushing pipe 15 is provided with a first flushing valve 151.

[0041] The shell flushing assembly includes a side flushing pipe 115 and a second flushing pipe 14 . The side flushing pipe 115 is opened on the side wall of the shell 11 on one side of the V-shaped screen plate 13 . The second flushing pipe 14 is connected to the side flushing pipe 115 , and a second flushing valve 141 is provided on the second flushing pipe 14 .

[0042] The chilled water outlet 113 of the filter body 1 of the present invention is located above the chilled water inlet 114, and the V-shaped sieve plate 13 is arranged below the flushing nozzle 12 and between the chilled water outlet 113 and the chilled water inlet 114. The design enables the gray water with solid particles to enter from the lower chilled water inlet 114 of the filter body 1, and after being filtered by the sieve holes of the V-shaped sieve plate 13, the relatively clear water flows out of the filter body 1 from the chilled water outlet 113, wherein the solid particles settle at the bottom of the filter body 1 under the action of their own weight, and finally are discharged from the sewage outlet 112; and the design of the V-shaped sieve plate increases the area relative to the horizontal sieve plate, so that the impact pressure of the water is dispersed, the pressure on the V-shaped sieve plate is reduced, the pressure resistance of the sieve plate itself is improved, and the deformation rate is reduced;

[0043] Moreover, the coal gasification quenching water filtration system of the present invention can realize online automatic double cleaning. Through the design of the sieve plate flushing component, the V-shaped sieve plate 13 can be fully cleaned from above the V-shaped sieve plate 13. Combined with the design of the shell flushing component, the side flushing pipe 115 is arranged along the tangent direction of the shell. After the flushing water enters the filter body, the water can rotate along the inner wall of the shell. Under the push of high pressure, the lower space of the V-shaped sieve plate and the inner wall of the shell can be flushed in place. The ash after the V-shaped sieve plate 13 is cleaned by the flushing nozzle is quickly flushed out of the filter body, which improves the flushing effect and service life of the inside of the filter body, realizes the recycling of the filter body, and solves the current problem of ash clogging the filter, resulting in insufficient quenching water supply, and the inability of the gasifier to achieve long-term operation, reduces the work intensity of personnel and saves production investment costs.

[0044] The quenching water of the present invention mainly comes from the supernatant produced after the gasification ash water is washed in the washing tower after the synthesis gas. The water contains a certain amount of solid particles. The quenching water of this quenching water system needs to be sent to the gasifier as the protection water for the decline of synthesis gas and the quenching water for synthesis gas. Once the quenching water filter is blocked and the quenching water is lacking, it is bound to cause the entire gasification system to stop. Through the design of the present invention, the high-pressure ash water of the gasification ash water system can be used to automatically clean the sieve plate flushing component and the shell flushing component to realize the automatic regeneration and switching of the filter body of the filtration system, solve the current filter blockage problem, and the problem that the gasifier cannot operate for a long period of time due to the blockage of the quenching water filter, reduce the work intensity of personnel and save production investment costs.

[0045] In this embodiment, Figure 2-3 As shown, the ferrule assembly includes a first ferrule 19 and a second ferrule 110 that are symmetrically arranged, the first ferrule 19 is arranged at the lower end of the top flushing pipe 111 that extends downward into the housing 11, and the second ferrule 110 is connected to the first ferrule 19 through a fastener with a gasket 1101 arranged therebetween;

[0046] The flushing nozzle 12 includes an upper portion 121, a middle portion 122 and a lower portion 123 which are sequentially connected from top to bottom. The upper portion 121 is located in the first ferrule 19 and the second ferrule 110, and the inner cavities of the second ferrule 110 and the first ferrule 19 form a moving space 100 for the upper portion 121 to move up and down. The outer diameter of the upper portion 121 is greater than the outer diameter of the middle portion 122. The second ferrule 110 is sleeved on the outer side of the middle portion 122. The middle portion 122 is cylindrical, and the lower portion 123 is inverted cone shape with a plurality of flushing holes opened on its outer wall.

[0047] The present invention can avoid leakage of top flushing water in the moving space 100 by designing the outer diameter of the upper part 121 of the flushing nozzle 12 to be larger than the outer diameter of the middle part 122. The lower surface of the upper part 121 is provided with a sealing surface, which can achieve water sealing under the pressure of flushing water, thereby improving the sealing performance of the flushing nozzle 12.

[0048] Specifically, the plurality of flushing holes include a first-layer flushing hole 1231, a second-layer flushing hole 1232 and a bottom flushing hole 1233 arranged from top to bottom. The first-layer flushing holes 1231 and the second-layer flushing holes 1232 are respectively provided in a plurality and evenly distributed on the outer peripheral wall of the lower portion 123. The first-layer flushing holes 1231 and the second-layer flushing holes 1232 are both arranged obliquely, and the bottom flushing hole 1233 is arranged vertically toward the V-shaped sieve plate 13.

[0049] In this embodiment, the cone angle of the lower part 123 of the flushing nozzle 12 is 90°; the first layer of flushing holes 1231 has three flushing holes 1, 2 and 3, respectively, the angle of flushing hole 1 is 0° in the X-axis direction, 30° counterclockwise offset in the Y-axis direction, and 151° to 168° clockwise offset in the Z-axis direction; the angle of flushing hole 2 is 120° in the X-axis direction, 30° counterclockwise offset in the Y-axis direction, and 151° to 168° clockwise offset in the Z-axis direction; the angle of flushing hole 3 is 240° in the X-axis direction, 30° counterclockwise offset in the Y-axis direction, and 151° to 168° clockwise offset in the Z-axis direction;

[0050] The second layer of flushing holes 1232 has three flushing holes 1232, namely flushing hole 4, flushing hole 5 and flushing hole 6. The angle of flushing hole 4 is offset 60° counterclockwise in the X-axis direction, 30° counterclockwise in the Y-axis direction, and 167° to 177° clockwise in the Z-axis direction; the angle of flushing hole 5 is offset 180° counterclockwise in the X-axis direction, 30° counterclockwise in the Y-axis direction, and 167° to 177° clockwise in the Z-axis direction; the angle of flushing hole 6 is offset 300° counterclockwise in the X-axis direction, 30° counterclockwise in the Y-axis direction, and 167° to 177° clockwise in the Z-axis direction;

[0051] The bottom flushing hole 1233 has a conical hole, and the angle of the conical hole is 176° to 184° clockwise offset from the Z axis.

[0052] Here, the coordinate system is described as follows: the center line of the nozzle is used as the reference, the horizontal direction to the right is the X-axis 0°, the front-to-back direction is the Y-axis 0°, and the vertical direction upward is the Z-axis 0°.

[0053] The present invention utilizes high-pressure ash water from a coal gasification ash water system, combined with the structural design of a flushing nozzle and a ferrule assembly, and utilizes a flushing nozzle with a cone angle of 90° and an inverted cone-shaped lower portion to open a plurality of obliquely arranged flushing holes. Through the coordination between the first-layer flushing holes, the second-layer flushing holes and the bottom flushing holes at the above-mentioned angles and the V-shaped sieve plate at an angle of 90° to 120°, the flushing water of the first flushing pipe can be pressurized by the multiple flushing holes, the flow rate becomes faster, and the kinetic energy is improved. Under the impact, the V-shaped sieve plate can be fully flushed. Combined with the flushing of the inner wall of the shell by the side flushing pipe, the deposited ash can be quickly flushed out of the filter body, thereby improving the filtering effect of the coal gasification quenching water filtration system and the flushing effect of the filter body.

[0054] like Figure 4 is a cross-sectional view of AA in the flushing nozzle; Figure 5 It is a cross-sectional view of BB in the flushing nozzle;

[0055] Here, due to the design of the Y-direction angle of the flushing nozzle 12, a component force is generated in the Y-direction under the pressure of the high-pressure gray water of the flushing water, and the flushing nozzle 12 is pushed to rotate under the reaction force. Specifically, in this embodiment, the angles of the first-layer flushing holes 1231 and the second-layer flushing holes 1232 in the X-direction differ by 60°, and the offset angles in the Y-direction are the same. The two layers of flushing holes form a combined force, and the reaction force thereof can make the flushing nozzle 12 rotate rapidly in the second ferrule 110 and the first ferrule 19. Under the guidance of the first-layer flushing holes 1231 and the second-layer flushing holes 1232, the normal stress and surface force of the high-pressure gray water are changed, and the turbulence of the water is changed by the angle of the flushing holes to form a diffuse fluid. Combined with the design of the V-shaped sieve plate with an angle of 90° to 120°, the first-layer flushing holes 1231 The long water columns sprayed out from each flushing hole of the second layer 1232 become surface flushing. The first layer 1231 flushes the upper two-thirds of the V-shaped sieve plate 13, the second layer 1232 flushes the middle area of ​​the V-shaped sieve plate 13, and the water flow sprayed from the bottom flushing hole 1233 is dispersed. This design allows the high-pressure gray water flow from the first flushing pipe to be pressurized by the nozzle flushing hole, the flow rate becomes faster, and the kinetic energy is increased. Under the action of the turbulent positive stress and surface force of the high-pressure gray water, the water flow diffuses along the downward angle to fully cover the V-shaped sieve plate 13 for flushing. Among them, due to the vertical design of the sieve holes and the large bottom and small top aperture design, the gray water is quickly washed out of the sieve holes. Under the action of the high-pressure gray water flushing the lower part of the filter, the ash residue falling off the sieve plate is quickly flushed out of the filter, thereby improving the flushing effect and efficiency.

[0056] In this embodiment, the V-shaped sieve plate 13 is installed in the housing 11 through a fixing bracket 1102. The angle of the V-shaped sieve plate 13 is 90° to 120°, and a plurality of sieve holes are vertically opened on the V-shaped sieve plate 13. The design of the V-shaped sieve plate not only increases the filtering area, but also reduces the stress of the overall cross-section of the sieve plate by 15% to 30%, thereby increasing the use strength of the sieve plate, effectively preventing the deformation of the sieve plate, and increasing the service life of the sieve plate; and here, the vertical sieve hole design facilitates the ash residue on the V-shaped sieve plate to be quickly washed away, thereby improving the washing efficiency;

[0057] Specifically, Figure 2 The schematic diagram of the application of the V-shaped sieve plate at an angle of 90° and 120° is shown in FIG. The dotted lines in the figure are schematic diagrams of the flushing coverage of the V-shaped sieve plate by the first flushing holes 1231, the second flushing holes 1232 and the bottom flushing holes 1233 of the flushing nozzle 12;

[0058] Under normal circumstances, when the filter medium temperature and pressure are constant, the force F output by the filter medium fluid is constant. Then the pressure P1 borne by the horizontal screen plate is: P1 = F / A1 horizontal screen plate area:

[0059] Pressure on horizontal sieve plate:

[0060] When using a V-type sieve plate, the filter medium temperature and pressure remain unchanged, and the force F output by the filter medium fluid remains unchanged. Then the pressure P2' borne by the V-type sieve plate (90°) is: P2' = F / A2

[0061] V-type sieve plate side area:

[0062] Pressure P2 of 90° sieve plate:

[0063] The pressure P3 of the 120° sieve plate is:

[0064] Comparison of the pressure on horizontal sieve plates and V-shaped sieve plates: P1>P3>P2. It can be seen that the V-shaped sieve plate with an angle of 90°~120° can reduce the vertical compressive stress of the sieve plate by 15~30%, thereby improving the strength and compressive resistance of the sieve plate itself. From the analysis of the force, the V-shaped sieve plate can greatly prevent deformation and increase its service life.

[0065] In the present embodiment, there are several sieve holes, which are conical sieve holes with an angle of 20°, an upper aperture of 5mm, a lower aperture of 6mm, and a gap of 6mm between two adjacent sieve holes; the sieve holes are circular holes, and the purpose of this design is to prevent particles from passing through the sieve holes and to easily flush the particles off the sieve plate during upper flushing; wherein, the diameter of the sieve holes is smaller than the gap of the gasifier quenching ring distributor, which can prevent solid particles from clogging the quenching ring; in addition, the V-shaped sieve plate of the present invention is an integral design, which can improve the strength of the sieve plate. When the sieve plate is damaged due to a malfunction or an accident and needs to be repaired and replaced, the head can be removed for replacement (as shown in the figure, the shell includes the head and the lower part of the shell).

[0066] In this embodiment, the water inlet end of the second flushing pipe 14 is arranged on the first flushing pipe 15, and a control valve 142 is provided on the pipeline at the water inlet end, which can simplify the pipeline layout and facilitate maintenance and pipeline control.

[0067] In the present embodiment, a bypass pipe 1103 is connected in parallel to the first flushing pipe 15, and a bypass valve 1104 is provided on the bypass pipe 1103. The design of the bypass pipe 1103 and the bypass valve 1104 can prevent the filter body from having a situation where the process quenching water has poor quality and a high solid content, and ash residue may enter the flushing nozzle in reverse and block the flushing hole. Specifically, when the filter body is flushed, the first flushing valve 151 is closed, and the bypass valve 1104 is opened. The flushing water enters the flushing nozzle 12 through the bypass pipe 1103, so that the flushing nozzle maintains a positive pressure operation and prevents the entry of quenching water with a high solid content. This can protect the flushing nozzle 12 and increase the long-term effective operation cycle of the flushing nozzle 12. Here, the diameter of the bypass pipe 1103 is designed to be small. Therefore, the amount of flushing water used in this situation is small, which does not affect the normal operation of the system, and the flushing in the present embodiment The washing water can be the process ash water treated by the coal gasification ash water system, which does not increase the water consumption of the system. During the operation of the water-coal slurry gasification filtration system, the high-pressure ash water is the process ash water of the deaerator or the hot water tower, and its solid content is less than 1 mg / L, the turbidity is less than 20 NTU, and the pressure is 2.0 MPa higher than the quenching water pressure. After the quenching water filter is depressurized, the pressure difference for flushing the filter can reach 8.0 MPa. With the support of the flushing nozzle 12, the filter body can be well flushed, so that the filter body can achieve the purpose of regeneration, extending the service life of the filter, thereby increasing the service life of the coal gasification quenching water filtration system, solving the current problem of ash clogging the filter, resulting in insufficient supply of quenching water, and the inability of the gasifier to achieve long-term operation, reducing the work intensity of personnel, and saving the production investment cost of the coal gasification quenching water filtration system of the present invention. The present invention has low operating cost and high practicality. In this embodiment, Figure 6 In order to ensure the force balance of the filter, the quenching water outlet and the quenching water inlet are designed to be on the same axis. In this embodiment, the side flushing pipe 115 is arranged along the tangent direction of the shell 11. After the flushing water enters the shell 11 through the side flushing pipe 115, it can rotate along the tank wall and spirally clean under high pressure, so that the inner wall of the shell and the lower space of the screen plate 13 can be flushed in place, which greatly improves the flushing effect.

[0068] In this embodiment, the distance from the bottom of the flushing nozzle 12 to the center of the V-shaped sieve plate 13 is 1 to 1.2 times the inner diameter of the shell 11. This distance can ensure the water pressure of the flushing nozzle 12 and improve the cleaning effect of the V-shaped sieve plate 13. In this embodiment, a manhole 1105 is opened on the side wall of the shell 11 for easy maintenance.

[0069] The chilled water inlet 114 is externally connected to an inlet pipe 17, on which a chilled water inlet valve 171 is provided; the chilled water outlet 113 is externally connected to an outlet pipe 18, on which a chilled water outlet valve 181 is provided; the sewage outlet 112 is externally connected to a sewage pipe 16, on which a sewage valve 161 is provided, and an inlet pressure gauge 172 is provided on the inlet pipe 17, which measures the pressure difference of the V-shaped sieve plate 13 by detecting the pressure at the bottom of the V-shaped sieve plate 13 during operation to prevent the pressure difference from being too high, causing deformation of the V-shaped sieve plate 13; the outlet pressure gauge 182 is provided on the outlet pipe 18, which measures the pressure difference of the V-shaped sieve plate 13 by detecting the pressure at the top of the V-shaped sieve plate 13 during operation to prevent the pressure difference from being too high, causing deformation of the V-shaped sieve plate 13.

[0070] A pressure difference is formed between the inlet pressure gauge 172 and the outlet pressure gauge 182, and the pressure difference value is transmitted to the control program PLC, which controls the operation of the flushing programs of the screen plate flushing assembly and the shell flushing assembly.

[0071] Specifically, when the present invention is used, at least one filter body is operated. When the pressure difference between the inlet pressure gauge and the outlet pressure gauge during operation reaches a set value, the other filter body is switched to operate, and the corresponding chilled water inlet valve and chilled water outlet valve are opened. After the chilled water flow display returns to normal, the chilled water inlet valve and chilled water outlet valve of the currently operating filter body are closed, and the drain valve, the first flushing valve and the second flushing valve are opened to start the flushing procedure of the screen plate flushing assembly and the shell flushing assembly.

[0072] The filter body of the present invention adopts a V-shaped sieve plate, combined with the side spiral flushing method of the lower part of the V-shaped sieve plate and the high-pressure automatic rotating flushing method of the flushing nozzle on the upper part of the V-shaped sieve plate, to achieve the purpose of timed quantitative backwashing of the filter body, to achieve the purpose of regenerating the filter body and extending the service life of the filter body. The specific automatic procedures of the two filter bodies (hereinafter referred to as the filter body and the spare filter body) are as follows:

[0073] Step 1: Run the filter body, close the first flushing valve 151 of the filter body, open the bypass valve 1104 by 50%, close the drain valve 161, close the second flushing valve 141, open the filter chilling water inlet valve 171, and open the chilling water outlet valve 181; the standby filter body is not running temporarily;

[0074] Step 2: When the pressure difference between the inlet pressure gauge 172 and the outlet pressure gauge 182 of the filter body is greater than the set value (generally ≤500kpa, of course, the specific value is set according to the working conditions), it is prompted that the filter body 1 needs to be backwashed;

[0075] Step 3: Put the standby filter body into operation (open the corresponding chilled water inlet valve and chilled water outlet valve), cut out the running filter body 1, and close the outlet valve 181 and inlet valve 171 of the filter body;

[0076] Step 4: Open the drain valve 161;

[0077] Step 5: flush the filter body 1, open the second flushing valve 141, and the flushing water rotates along the tangent direction of the inner wall of the shell 11 to clean the inside of the shell 11. Under the push of high pressure, the lower space of the V-shaped sieve plate can be flushed in place, and the ash can be quickly discharged; open the first flushing valve 151, and the flushing water rotates at high speed and flushes the V-shaped sieve plate under the pressure of the flushing nozzle 12 and the reaction force of the water flow. The spray water changes from a laminar linear shape to a turbulent surface shape, and is sprayed out along the angle to cover the entire V-shaped sieve plate for flushing, and the fallen ash is quickly flushed out of the filter body;

[0078] Step 6: When the flushing time is up and the pressure difference between the inlet pressure gauge 172 and the outlet pressure gauge 182 is detected to be less than the specified value, the flushing of the filter body 1 is completed;

[0079] Step 7: Close the first flushing valve 151, close the second flushing valve 141, close the drain valve 161, and under the protection of the flushing nozzle 12 entering the water through the bypass valve 1104, the filter body 1 is slowly pressurized to a constant pressure (inlet pressure gauge 172 = outlet pressure gauge 182);

[0080] Step 8: The filter can be put into operation again, and the water inlet valve 171 and the water outlet valve 181 are opened.

[0081] The above disclosure is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A coal gasification quenching water filtration system, characterized in that: The invention comprises at least two filter bodies (1) connected to a coal gasification quenching water system and arranged in parallel, each of the filter bodies (1) comprising a shell (11), a V-shaped sieve plate (13), a sieve plate flushing assembly and a shell flushing assembly, a quenching water outlet (113) and a quenching water inlet (114) are respectively provided on the side walls of the shell (11), and a sewage outlet (112) is provided at the bottom, the quenching water outlet (113) is located above the quenching water inlet (114), and the V-shaped sieve plate (13) is installed between the quenching water outlet (113) and the quenching water inlet (114); The sieve plate flushing assembly comprises a top flushing pipe (111), a flushing nozzle (12) and a first flushing pipe (15); the top flushing pipe (111) is arranged on the top of the shell (11); the flushing nozzle (12) is movably installed below the top flushing pipe (111) through a ferrule assembly and is in communication with the top flushing pipe (111); one end of the first flushing pipe (15) is in communication with the top flushing pipe (111), and the other end is connected to high-pressure ash water of a coal gasification ash water system; a first flushing valve (151) is provided on the first flushing pipe (15); The shell flushing assembly comprises a side flushing pipe (115) and a second flushing pipe (14); the side flushing pipe (115) is opened on the side wall of the shell (11) on one side of the V-shaped sieve plate (13); the second flushing pipe (14) is connected to the side flushing pipe (115), and a second flushing valve (141) is provided on the second flushing pipe (14).

2. A coal gasification quenching water filtration system according to claim 1, characterized in that: The ferrule assembly comprises a first ferrule (19) and a second ferrule (110) which are symmetrically arranged, wherein the first ferrule (19) is arranged at the lower end of the top flushing pipe (111) extending downward into the housing (11), and the second ferrule (110) is connected to the first ferrule (19) via a fastener, with a gasket (1101) arranged therebetween; The flushing nozzle (12) includes an upper portion (121), a middle portion (122) and a lower portion (123) which are connected in sequence from top to bottom, the upper portion (121) is located in the first ferrule (19) and the second ferrule (110), and the inner cavities of the second ferrule (110) and the first ferrule (19) form a moving space (100) for the upper portion (121) to move up and down, the outer diameter of the upper portion (121) is greater than the outer diameter of the middle portion (122), the second ferrule (110) is sleeved on the outer side of the middle portion (122), the middle portion (122) is cylindrical, the lower portion (123) is inverted cone shape and has a plurality of flushing holes on its outer wall.

3. A coal gasification quenching water filtration system according to claim 2, characterized in that: The plurality of flushing holes include a first layer of flushing holes (1231), a second layer of flushing holes (1232) and a bottom flushing hole (1233) arranged from top to bottom. The first layer of flushing holes (1231) and the second layer of flushing holes (1232) are respectively provided in a plurality and are evenly distributed on the outer peripheral wall of the lower part (123). The first layer of flushing holes (1231) and the second layer of flushing holes (1232) are both arranged obliquely, and the bottom flushing holes (1233) are arranged vertically toward the V-shaped sieve plate (13).

4. A coal gasification quenching water filtration system according to claim 3, characterized in that: The cone angle of the lower part (123) of the flushing nozzle (12) is 90°; the first layer of flushing holes (1231) has three flushing holes, namely flushing hole 1, flushing hole 2 and flushing hole 3; the angle of flushing hole 1 is 0° in the X-axis direction, 30° counterclockwise offset in the Y-axis direction, and 151° to 168° clockwise offset in the Z-axis direction; the angle of flushing hole 2 is 120° in the X-axis direction, 30° counterclockwise offset in the Y-axis direction, and 151° to 168° clockwise offset in the Z-axis direction; the angle of flushing hole 3 is 240° in the X-axis direction, 30° counterclockwise offset in the Y-axis direction, and 151° to 168° clockwise offset in the Z-axis direction; The second layer of flushing holes (1232) has three flushing holes 4, 5 and 6, respectively. The flushing hole 4 has an angle of 60° counterclockwise in the X-axis direction, 30° counterclockwise in the Y-axis direction, and 167° to 177° clockwise in the Z-axis direction; the flushing hole 5 has an angle of 180° counterclockwise in the X-axis direction, 30° counterclockwise in the Y-axis direction, and 167° to 177° clockwise in the Z-axis direction; the flushing hole 6 has an angle of 300° counterclockwise in the X-axis direction, 30° counterclockwise in the Y-axis direction, and 167° to 177° clockwise in the Z-axis direction; The bottom flushing hole (1233) has a conical hole, and the angle of the conical hole is 176° to 184° clockwise offset from the Z axis.

5. The coal gasification quenching water filtration system according to claim 1, characterized in that: The V-shaped sieve plate (13) is installed in the housing (11) via a fixing bracket (1102); the angle of the V-shaped sieve plate (13) is 90° to 120°, and a plurality of sieve holes are vertically opened on the V-shaped sieve plate (13).

6. A coal gasification quenching water filtration system according to claim 5, characterized in that: Several of the sieve holes are conical holes, the angle of the conical holes is 20°, the upper hole diameter of the sieve hole is 5 mm, the lower hole diameter is 6 mm, and the gap between two adjacent sieve holes is 6 mm.

7. A coal gasification quenching water filtration system according to claim 1, characterized in that: The water inlet end of the second flushing pipe (14) is arranged on the first flushing pipe (15), and a control valve (142) is provided on the pipeline of the water inlet end; a bypass pipe (1103) is connected in parallel to the first flushing pipe (15), and a bypass valve (1104) is provided on the bypass pipe (1103).

8. The coal gasification quenching water filtration system according to claim 1, characterized in that: The distance from the bottom of the flushing nozzle (12) to the center of the V-shaped screen plate (13) is 1 to 1.2 times the inner diameter of the shell (11), and a manhole (1105) is provided on the side wall of the shell (11).

9. The coal gasification quenching water filtration system according to claim 1, characterized in that: The quenching water inlet (114) is externally connected to an inlet pipe (17), and a quenching water inlet valve (171) is provided on the inlet pipe (17); the quenching water outlet (113) is externally connected to an outlet pipe (18), and a quenching water outlet valve (181) is provided on the outlet pipe (18); the sewage outlet (112) is externally connected to a sewage pipe (16), and a sewage pipe (16) is provided with a sewage valve (161); the inlet pipe (17) is provided with an inlet pressure gauge (172), and the outlet pipe (18) is provided with an outlet pressure gauge (182); a pressure difference is formed between the inlet pressure gauge (172) and the outlet pressure gauge (182), and the pressure difference value is transmitted to the control program PLC.

10. The coal gasification quenching water filtration system according to claim 1, characterized in that: During use, at least one filter body is operated. When the pressure difference between the inlet pressure gauge (172) and the outlet pressure gauge (182) during operation reaches a set value, another filter body is switched to operate, and the corresponding chilling water inlet valve (171) and chilling water outlet valve (181) are opened. After the chilling water flow rate display returns to normal, the chilling water inlet valve (171) and chilling water outlet valve (181) of the currently operating filter body are closed, and the drain valve (161), the first flushing valve (151) and the second flushing valve (141) are opened to start the flushing procedure.

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