Powdered coal gasification flash evaporation system

Abstract

The utility model relates to a pulverized coal gasification flash evaporation system which comprises a gas conveying pipe, a water conveying pipe and a control valve, and the gas conveying pipe is communicated with a gas outlet of a vacuum flash evaporation tank and a gas inlet of an air cooler; one end opening of the water conveying pipe is a water inlet, the other end opening of the water conveying pipe is closed, the water conveying pipe penetrates through the gas conveying pipe and is located above the gas outlet of the vacuum flash tank, and a plurality of spraying openings are formed in part of pipe sections located in the gas conveying pipe; the control valve is arranged between the water inlet of the water conveying pipe and the spraying opening, located outside the air conveying pipe and configured to allow or prevent water from flowing to the closed end opening from the water inlet of the water conveying pipe. Ash carried by the flash steam is subjected to weight increment sedimentation and falls back to the vacuum flash tank under the action of the spray water, and does not enter a tube nest of the air cooler, so that the problem that the air cooler is blocked is solved. In addition, the water introduced by the water delivery pipe has a cooling effect on the flash steam, so that leakage of the air cooler tube nest caused by overlarge temperature difference when the flash steam enters the air cooler tube nest is prevented.

Description

Technical Field

[0001] The present disclosure relates to the technical field of coal chemical industry, and in particular to a pulverized coal gasification flash evaporation system. Background Art

[0002] During the coal gasification process, due to the high load of the gasifier, the flash gas produced by the flash system is large and contains a large amount of ash, which causes the air cooler tubes to become blocked, thus affecting the vacuum degree of the flash system and making it impossible to gasify the coal for a long time. In addition, the northern region produces a large amount of coal. Due to the low ambient temperature in winter in the northern region, the air cooler tubes leak to varying degrees when the temperature changes.

[0003] In view of this, technical personnel in this field urgently need to find another way to solve the problem of air cooler tube blockage and leakage. Utility Model Content

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a pulverized coal gasification flash system that solves the problems of air cooler tube blockage and leakage.

[0005] In a first aspect, the pulverized coal gasification flash system of the present disclosure comprises:

[0006] An air delivery pipe, wherein the air delivery pipe is configured to connect the air outlet of the vacuum flash tank with the air inlet of the air cooler;

[0007] A water pipe, one end of which is a water inlet and the other end is closed, the water pipe runs through the gas pipe and is located above the gas outlet of the vacuum flash tank, and a plurality of spray ports are opened on a part of the pipe section located in the gas pipe;

[0008] A control valve is arranged between the water inlet of the water pipe and the spray port and outside the air pipe, and is configured to allow or prevent water from flowing from the water inlet of the water pipe to the closed port.

[0009] In one embodiment of the present disclosure, the water pipe is horizontally arranged and is arranged at an angle of 90° with the axis of the gas pipe.

[0010] In one embodiment of the present disclosure, the spray port is disposed below the water pipe and is disposed at an angle of 45° to the horizontal plane.

[0011] In one embodiment of the present disclosure, the water inlet diameter of the water pipe is larger than the diameter of the water pipe.

[0012] In one embodiment of the present disclosure, the wall thickness of the water inlet of the water pipe is greater than the wall thickness of the water pipe.

[0013] In one embodiment of the present disclosure, the water inlet diameter of the water pipe is 145-155 mm; the diameter of the water pipe is 85-95 mm; the wall thickness of the water inlet of the water pipe is 4-6 mm; and the wall thickness of the water pipe is 3-4 mm.

[0014] In one embodiment of the present disclosure, the water pipe is 1000 mm long, wherein the plurality of spray ports are disposed at a position 300-700 mm away from a water inlet of the water pipe.

[0015] In one embodiment of the present disclosure, the diameter of the gas pipe is 450-550 mm.

[0016] In one embodiment of the present disclosure, a fixing piece is provided at the closed end of the water pipe, and the fixing piece is configured to fix the water pipe to the wall.

[0017] In one embodiment of the present disclosure, the pulverized coal gasification flash system further includes:

[0018] a vacuum flash tank configured to generate flash gas;

[0019] an air cooler configured to condense flash gas;

[0020] A settling tank is connected to the bottom of the vacuum flash tank through a pipeline and is configured to collect the slurry in the vacuum flash tank.

[0021] One beneficial effect of the pulverized coal gasification flash system disclosed in the present invention is that the gas pipeline connects the gas outlet of the vacuum flash tank and the gas inlet of the air cooler; one end of the water pipeline is the water inlet, and the other end is closed, the water pipeline runs through the gas pipeline and is located above the gas outlet of the vacuum flash tank, and a plurality of spray ports are opened on a part of the pipe section located in the gas pipeline; the control valve is arranged between the water inlet and the spray port of the water pipeline, and is located outside the gas pipeline, and is configured to allow or prevent water from flowing from the water inlet of the water pipeline to the closed port. During the coal gasification process, the control valve is opened, so that water flows from the water inlet of the water pipeline to the closed port, and then sprays out from the spray port into the gas pipeline under pressure, and the flash gas enters the gas pipeline from the gas outlet of the vacuum flash tank and passes through the spray port. The ash carried by the flash gas increases weight and settles under the action of the spray water and falls back to the vacuum flash tank, and will not enter the air cooler tube array, thereby solving the problem of air cooler blockage.

[0022] In addition, since the water introduced into the water pipe has a cooling effect on the flash steam, it prevents the flash steam from entering the air cooler tubes and causing leakage of the air cooler tubes due to excessive temperature difference. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0024] Figure 1 It is a structural schematic diagram of a pulverized coal gasification flash evaporation system provided in one embodiment of the present disclosure;

[0025] Figure 2 is a schematic diagram of the connection between a water pipe and a gas pipe provided in one embodiment of the present disclosure;

[0026] Figure 3 It is a schematic cross-sectional view of a water pipe provided in one embodiment of the present disclosure.

[0027] Figures 1 to 3 The one-to-one correspondence between the component names and the figure marks is as follows: 1-air pipe; 2-water pipe; 21-water inlet; 22-fixing part; 23-spraying port; 3-control valve; 4-vacuum flash tank; 5-air cooler; 6-sedimentation tank. DETAILED DESCRIPTION

[0028] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure unless otherwise specifically stated.

[0029] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0030] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0031] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0032] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0033] In this document, “upper”, “lower”, “front”, “back”, “left”, “right”, etc. are only used to indicate the relative position relationship between related parts, rather than to limit the absolute positions of these related parts.

[0034] In this article, "first", "second", etc. are only used to distinguish each other, and do not indicate the importance and order, or the premise of each other's existence.

[0035] In this document, “equal”, “same”, etc. are not strictly limited in a mathematical and / or geometric sense, but also include errors that can be understood by those skilled in the art and are allowed in manufacturing or use.

[0036] In order to solve the problem of blockage and leakage of the air cooler 5 tubes, the present disclosure provides a pulverized coal gasification flash system. Figures 1 to 3 , the specific structure and working principle of the pulverized coal gasification flash evaporation system disclosed in the present invention are explained in detail in combination with embodiments.

[0037] In one embodiment, the pulverized coal gasification flash system of the present invention includes a gas pipe 1, a water pipe 2 and a control valve 3, wherein the gas pipe 1 is constructed to connect the gas outlet of the vacuum flash tank 4 and the gas inlet of the air cooler 5; one end of the water pipe 2 is a water inlet 21, and the other end is closed, the water pipe 2 runs through the gas pipe 1 and is located above the gas outlet of the vacuum flash tank 4, and a plurality of spray ports 23 are opened on a part of the pipe section located in the gas pipe 1; the control valve 3 is arranged between the water inlet 21 and the spray port 23 of the water pipe 2, and is located outside the gas pipe 1, and is configured to allow or prevent water from flowing from the water inlet 21 of the water pipe 2 to the closed port.

[0038] Specifically, the gas pipe 1 connects the gas outlet of the vacuum flash tank 4 and the gas inlet of the air cooler 5, so that the flash gas enters the gas pipe 1 through the gas outlet of the vacuum flash tank 4, and then enters the air cooler 5 tube array through the gas inlet of the air cooler 5 for condensation. One end of the water pipe 2 is the water inlet 21, and the other end is closed. Water is continuously introduced into the water pipe 2, and water is sprayed out from the spray port 23 under pressure. The water introduced into the water pipe 2 is recycled water, that is, a large amount of industrial wastewater generated during the pulverized coal gasification process is treated and reused, which saves water resources, reduces the generation of new wastewater, and plays a role in protecting the environment. The water pipe 2 runs through the gas pipe 1 and is located above the gas outlet of the vacuum flash tank 4, so that after the coal ash absorbs the spray water and increases in weight, it settles back to the vacuum flash tank 4, continues to flash, and finally enters the sedimentation tank 6 with the slurry. A plurality of spray ports 23 are provided on the section of the water pipe 2 located inside the gas pipe 1, which increases the spraying area and improves the flash gas cooling and weighting effect. The control valve 3 is arranged outside the gas pipe 1, which is convenient for the manual operation of the staff and can also adjust whether the spraying water is turned on according to the actual working conditions of the pulverized coal gasification.

[0039] With such arrangement, the flash gas enters the gas pipe 1 from the gas outlet of the vacuum flash tank 4, and immediately contacts the spray port 23 of the water pipe 2 arranged above the gas outlet of the vacuum flash tank 4. The staff controls to open the control valve 3, so that water is sprayed out through the spray port 23 of the water pipe 2, and the spray water enters the gas pipe 1 and mixes with the flash gas, the temperature of the flash gas is reduced, and the ash carried by the flash gas absorbs the spray water to increase its weight, and under the action of gravity, it settles back to the vacuum flash tank 4. The coal ash solids do not enter the air cooler 5 tubes, so the problem of blockage of the air cooler 5 tubes is solved. In addition, the temperature of the flash gas is reduced, so that the temperature difference between the flash gas and the air cooler 5 tubes is reduced, preventing leakage caused by the rupture of the air cooler 5 tubes.

[0040] In one embodiment, the water pipe 2 is arranged horizontally and is arranged at an angle of 90° with the axis of the gas pipe 1 .

[0041] Specifically, the water pipe 2 and the gas pipe 1 are arranged vertically relative to each other, so that the spray port 23 can face the flash gas being transmitted, thereby improving the mixing effect of the flash gas and the spray water. The water pipe 2 is arranged horizontally, and the gas pipe 1 is arranged vertically, which is conducive to the ash carried by the flash gas to settle back to the vacuum flash tank 4 under the action of gravity after weight increase.

[0042] In one embodiment, the spray port 23 is disposed below the water pipe 2 and is disposed at an angle of 45° to the horizontal plane.

[0043] Specifically, the power of the spray water comes from gravity and the pressure in the water pipe 2. If the spray port 23 is set above the water pipe 2, the pressure in the water pipe 2 is opposite to the direction of gravity, which reduces the impact force of the spray water and reduces the mixing effect of the spray water and flash steam. If the spray port 23 is set below the water pipe 2, the gravity direction of the spray water is consistent with the pressure direction in the water pipe 2, which increases the impact force of the spray water and improves the mixing effect of the spray water and flash steam. The spray port 23 is set at a position with an angle of 45° to the horizontal plane, that is, on both sides below the water pipe 2. This arrangement expands the spraying area, allows the flash steam to fully contact with the spray water, and improves the effect of cooling and increasing the weight of the flash steam.

[0044] In one embodiment, the diameter of the water inlet 21 of the water pipe 2 is larger than the diameter of the water pipe 2 .

[0045] Specifically, the diameter of the water inlet 21 of the water delivery pipe 2 is larger than the diameter of the water delivery pipe 2. When the amount of water introduced is constant, the cross-sectional area of ​​the water delivery pipe 2 is small, and the flow rate of water is increased, so that when the water enters the water delivery pipe 2 through the water inlet 21, the pressure increases, the impact force of the spray water is increased, and the mixing effect of the spray water and the flash gas is improved.

[0046] In one embodiment, the wall thickness of the water inlet 21 of the water pipe 2 is greater than the wall thickness of the water pipe 2 .

[0047] Specifically, when the amount of water introduced is constant, the cross-sectional area of ​​the water pipe 2 is small, and the flow rate of water increases, so that when water enters the water pipe 2 through the water inlet 21, the pressure increases. Therefore, in order to prevent the water from causing serious impact and wear on the water pipe 2, the wall thickness of the water inlet 21 of the water pipe 2 is thickened to prevent the water pipe 2 from leaking.

[0048] In one embodiment, the diameter of the water inlet 21 of the water pipe 2 is 145-155 mm; the diameter of the water pipe 2 is 85-95 mm; the wall thickness of the water inlet 21 of the water pipe 2 is 4-6 mm; the wall thickness of the water pipe 2 is 3-4 mm.

[0049] Specifically, in order to meet the principle of interchangeability, the numerical ranges given in the present disclosure for the water inlet 21 of the water pipe 2 and the diameter and wall thickness of the water pipe 2 are numerical ranges commonly used in the art. Considering the production cost and interchangeability of the materials, preferably, the diameter of the water inlet 21 of the water pipe 2 is selected to be 150 mm, the diameter of the water pipe 2 is selected to be 89 mm, the wall thickness of the water inlet 21 of the water pipe 2 is selected to be 4 mm, and the wall thickness of the water pipe 2 is selected to be 3 mm.

[0050] In one embodiment, the water pipe 2 is 1000 mm long, wherein a plurality of spray ports 23 are disposed at a distance of 300-700 mm from the water inlet 21 of the water pipe 2 .

[0051] Specifically, the spray ports 23 are arranged in the middle section of the water pipe 2, and the middle section of the water pipe 2 is 400 mm in length. Preferably, the spray ports 23 can be arranged at intervals of 20 mm to arrange as many spray ports 23 as possible so that the spray water and the flash steam are fully mixed.

[0052] In one embodiment, the diameter of the gas delivery pipe 1 is 450-550 mm.

[0053] Specifically, in order to meet the principle of interchangeability, the numerical range given in the present disclosure for the diameter of the gas pipeline 1 is the numerical range commonly used in the art. Considering the production cost and interchangeability of the material, preferably, the diameter of the gas pipeline 1 is selected to be 500 mm. In addition, the length of the spray port 23 is 400 mm, which is completely located inside the gas pipeline 1.

[0054] In one embodiment, a fixing member 22 is disposed at the closed end of the water pipe 2 , and the fixing member 22 is configured to fix the water pipe 2 to the wall.

[0055] Specifically, a fixing member 22 is provided at the closed end of the water pipe 2. The fixing member 22 is a pipe fixing clamp that cooperates with a bolt to firmly fix the water pipe 2 to the wall to prevent the water pipe 2 from displacement or vibration under the impact of water.

[0056] In one embodiment, the pulverized coal gasification flash system further includes a vacuum flash tank 4, an air cooler 5 and a settling tank 6, wherein the vacuum flash tank 4 is configured to generate flash gas; the air cooler 5 is configured to condense the flash gas; the settling tank 6 is connected to the bottom of the vacuum flash tank 4 through a pipeline, and is configured to collect the slurry in the vacuum flash tank 4.

[0057] Specifically, the coal ash settles and returns to the vacuum flash tank 4, where it is mixed with water to form slurry, and then enters the sedimentation tank 6 from the bottom of the vacuum flash tank 4 through a pipeline. Under the action of gravity, the slurry is layered to form upper ash water and bottom precipitated solids. The upper ash water is selected and treated in a series of ways to be used as recycled water for spraying in the water pipe, thereby achieving the effect of recycling resources.

[0058] In addition, in order to facilitate better understanding, the flash process of the present disclosure is described in detail below in combination with the application scenario of an actual pulverized coal gasification flash system.

[0059] 1. Open the control valve 3, the water pipe 2 is filled with water, and the water is sprayed out steadily from the spray port 23;

[0060] 2. Start the flash evaporation system, the vacuum flash evaporation tank 4 introduces flash gas into the gas transmission pipe 1, and the flash gas is condensed by the air cooler 5;

[0061] 3. The slurry in the vacuum flash tank 4 enters the sedimentation tank 6 and is separated by gravity to form upper ash water and bottom sediment solids;

[0062] 4. Take out the upper layer of gray water in the sedimentation tank 6, and after treatment, flow it back to the water pipe for use.

[0063] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the marketplace, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein. The scope of the present disclosure is defined by the appended claims.

Claims

1. A pulverized coal gasification flash system, characterized in that: The pulverized coal gasification flash system comprises: An air delivery pipe (1), wherein the air delivery pipe (1) is configured to connect an air outlet of the vacuum flash tank (4) and an air inlet of the air cooler (5); A water pipe (2), one end of the water pipe (2) being a water inlet and the other end being closed, the water pipe (2) penetrating the gas pipe (1) and being located above the gas outlet of the vacuum flash tank (4), and a plurality of spray ports (23) being provided on a portion of the pipe section located in the gas pipe (1); A control valve (3), the control valve (3) being arranged between the water inlet (21) of the water pipe (2) and the spray port (23), and being located outside the air pipe (1), and being configured to allow or prevent water from flowing from the water inlet of the water pipe (2) to the closed port.

2. The pulverized coal gasification flash system according to claim 1, characterized in that: The water delivery pipe (2) is arranged horizontally and is arranged at an angle of 90° with the axis of the air delivery pipe (1).

3. The pulverized coal gasification flash system according to claim 2, characterized in that: The spray port (23) is arranged below the water delivery pipe (2) and is arranged at an angle of 45° with the horizontal plane.

4. The pulverized coal gasification flash system according to claim 3, characterized in that: The diameter of the water inlet (21) of the water delivery pipe (2) is larger than the diameter of the water delivery pipe (2).

5. The pulverized coal gasification flash system according to claim 4, characterized in that: The wall thickness of the water inlet (21) of the water delivery pipe (2) is greater than the wall thickness of the water delivery pipe (2).

6. The pulverized coal gasification flash system according to claim 5, characterized in that: The water inlet (21) of the water pipe (2) has a diameter of 145-155 mm; the water pipe (2) has a diameter of 85-95 mm; the water inlet (21) of the water pipe (2) has a wall thickness of 4-6 mm; the water pipe (2) has a wall thickness of 3-4 mm.

7. The pulverized coal gasification flash system according to claim 6, characterized in that: The water pipe (2) is 1000 mm long, wherein the plurality of spray ports (23) are arranged at a position 300-700 mm away from the water inlet (21) of the water pipe (2).

8. The pulverized coal gasification flash system according to claim 7, characterized in that: The diameter of the gas delivery pipe (1) is 450-550 mm.

9. The pulverized coal gasification flash system according to claim 8, characterized in that: The closed end of the water pipe (2) is provided with a fixing member (22), and the fixing member (22) is configured to fix the water pipe (2) to the wall.

10. The pulverized coal gasification flash system according to claim 9, characterized in that: The pulverized coal gasification flash system also includes: A vacuum flash tank (4), wherein the vacuum flash tank (4) is configured to generate flash gas; an air cooler (5), the air cooler (5) being configured to condense flash gas; A sedimentation tank (6), the sedimentation tank (6) is connected to the bottom of the vacuum flash tank (4) through a pipeline and is configured to collect the slurry in the vacuum flash tank (4).

Images