Coal gasification flash system

Abstract

The present disclosure relates to a pulverized coal gasification flash system, which comprises a flash tank, a liquid level meter, a first water inlet pipeline and a drainage pipeline, wherein the liquid level meter is connected with the high-pressure side of the flash tank through a first pipeline and connected with the low-pressure side of the flash tank through a second pipeline; the first water inlet pipeline is communicated with the first pipeline; the drainage pipeline is communicated with the first pipeline through a program-controlled valve and located at the downstream side of the first water inlet pipeline, and the program-controlled valve is configured to be opened only when the actual detection value of the liquid level meter reaches the plugging preset value; the liquid pressure of the first water inlet pipeline is greater than the liquid pressure of the flash tank entering the first pipeline. By increasing the drainage pipeline, the flushing water of the first water inlet pipeline is rapidly depressurized in the drainage pipeline, the flow rate of the liquid in the first pipeline is improved, the cleaning capacity of the flushing water is increased, the possibility of plugging is reduced, and the safety hazard caused by disassembly and inspection is avoided.

Description

Technical Field

[0001] This disclosure relates to the field of coal chemical technology, and in particular to a pulverized coal gasification flash evaporation system. Background Technology

[0002] Coal gasification refers to the conversion of solid coal into clean syngas. This technology not only improves coal utilization efficiency but also reduces environmental impact, making it crucial for the utilization of coal resources. A byproduct of gasification is black water. Black water typically includes coal slag, metals, ammonia, organic matter, and dissolved gases. Solid-liquid separation is achieved by treating black water using a flash evaporation system.

[0003] Because of the high solids content in black water, the base of the level gauge used to measure the level in the flash tank often gets clogged, causing inaccurate level readings. However, online disassembly and unclogging poses significant risks, including leaks and burns.

[0004] Currently, flushing pipes are installed to flush the base of the level gauges. However, due to the large volume of flushing water used, selecting clean water sources increases water consumption and generates new wastewater, raising production costs. Using recycled system water results in insufficient flushing pressure due to the high height of the flash evaporation pipes and pressure loss, leading to poor flushing effectiveness. Utility Model Content

[0005] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a pulverized coal gasification flash evaporation system.

[0006] The pulverized coal gasification flash evaporation system disclosed herein includes: Flash evaporator; A level gauge is connected to the high-pressure side of the flash tank via a first pipeline and to the low-pressure side of the flash tank via a second pipeline. The first water inlet pipe is connected to the first pipe; A drainage pipeline, which is connected to the first pipeline via a programmable valve and is located downstream of the first water inlet pipeline, wherein the programmable valve is configured to open only when the actual detection value of the level gauge reaches a preset blockage value; The liquid pressure in the first inlet pipe is greater than the liquid pressure entering the first pipe from the flash tank.

[0007] In one embodiment of this disclosure, the pulverized coal gasification flash evaporation system further includes a second water inlet pipe, which is connected to the second pipeline.

[0008] In one embodiment of this disclosure, the pulverized coal gasification flash evaporation system further includes a flow guide tee. The first pipeline includes a first pipeline section and a second pipeline section. One port of the first pipeline section is connected to the high-pressure side of the flash tank, and the other port is connected to the first port of the flow guide tee. One port of the second pipeline section is connected to the level gauge, and the other port is connected to the second port of the flow guide tee. The third port of the flow guide tee is connected to the drainage pipeline through the programmable valve.

[0009] In one embodiment of this disclosure, the top of the flash tank further includes a gas outlet, which is connected to the first water inlet pipe and the second water inlet pipe via a condenser pipe.

[0010] In one embodiment of this disclosure, the first pipeline is provided with a first switching valve, and the second pipeline is provided with a second switching valve; Both the first and second switching valves are normally open and are only closed during maintenance of the flash tank and when the liquid level is being monitored.

[0011] In one embodiment of this disclosure, the first water inlet pipe is provided with a first shut-off valve, and the second water inlet pipe is provided with a second shut-off valve; Both the first and second shut-off valves are normally open and are only closed during maintenance of the flash tank and when the liquid level is being monitored.

[0012] In one embodiment of this disclosure, the drainage pipe is connected to a floor drain via a water-connecting hose.

[0013] In one embodiment of this disclosure, the axis of the second pipeline segment forms an acute angle of 45°-60° with the axis of the drainage pipeline.

[0014] In one embodiment of this disclosure, the programmable valve is provided with a wear-resistant coating.

[0015] In one embodiment of this disclosure, the pulverized coal gasification flash evaporation system further includes a control element. The control element is communicatively connected to the level gauge and the programmable valve, and is configured to acquire the actual detection value of the level gauge. When the actual detection value is less than or equal to a blockage preset value, the control element controls the programmable valve to open. After the programmable valve has been open for a preset time, the programmable valve is closed, and the above process is repeated until the actual detection value is greater than the blockage preset value when the programmable valve is closed.

[0016] One beneficial effect of the pulverized coal gasification flash evaporation system disclosed herein is that the level gauge is connected to the flash tank via a first pipeline and a second pipeline, respectively measuring the pressure of the liquid and gas phases within the flash tank to calculate the liquid level. The first inlet water pipeline and the drain water pipeline are connected to the first pipeline, with the programmable valve on the drain water pipeline closed. When a blockage occurs in the first pipeline, the actual reading of the level gauge changes until it reaches the preset blockage value, at which point the programmable valve opens. Because the drain water pipeline is located downstream of the first inlet water pipeline, and the liquid pressure in the first inlet water pipeline is greater than the liquid pressure entering the first pipeline from the flash tank, the liquid in the first inlet water pipeline flows rapidly, flushing the first pipeline and the level gauge, before flowing out through the drain water pipeline. By adding a drain water pipeline, the flushing water in the first inlet water pipeline is rapidly depressurized in the drain water pipeline, increasing the flow rate of the liquid in the first pipeline, enhancing the cleaning ability of the flushing water, reducing the possibility of blockage, and avoiding safety hazards caused by disassembly and unclogging. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments of the present disclosure and, together with their description, serve to explain the principles of the present disclosure.

[0018] Figure 1 This is a schematic diagram of the structure of a pulverized coal gasification flash evaporation system provided in one embodiment of this disclosure.

[0019] Figure 1 The one-to-one correspondence between the component names and the reference numerals in the figures is as follows: 1-Flash tank; 2-Level gauge; First pipeline; 31-First pipeline section; 32-Second pipeline section; 33-First switching valve; 4-Second pipeline; 41-Second switching valve; 5-First inlet pipeline; 51-First shut-off valve; 6-Drainage pipeline; 61-Programmable valve; 7-Second inlet pipeline; 71-Second shut-off valve; 8-Flow guide tee; 9-Condenser pipe; 10-Floor drain; 11-Control element. Detailed Implementation

[0020] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present disclosure.

[0021] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use.

[0022] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0023] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0025] In this article, terms such as "up," "down," "front," "back," "left," and "right" are used only to indicate the relative positional relationship between related parts, rather than to define the absolute position of these related parts.

[0026] In this article, "first," "second," etc., are used only to distinguish one another, and not to indicate degree of importance, order, or prerequisite for each other.

[0027] In this document, terms such as “equal” and “same” are not strict mathematical and / or geometric limitations, but also include errors that are understandable to those skilled in the art and permissible in manufacturing or use.

[0028] PLC controller: Programmable Logic Controller (PLC) is a digital electronic device with a microprocessor. It is used for automation control and can load control instructions into memory for storage and execution at any time. A programmable controller is modularly composed of an internal CPU, instruction and data memory, input / output units, power supply modules, digital and analog units, etc., and is widely used in the field of industrial control.

[0029] It should be noted that this disclosure defines the direction of black water flow from the flash tank into the first pipeline as the upstream side, and the direction of the black water source as the downstream side, based on the flow direction of the black water entering the first pipeline from the flash tank.

[0030] The level gauges in existing pulverized coal gasification flash evaporation systems are prone to clogging at the root. Therefore, this disclosure provides a pulverized coal gasification flash evaporation system. For ease of understanding, please refer to the following... Figure 1 The specific structure and working principle of the pulverized coal gasification flash evaporation system disclosed herein will be described in detail with reference to the embodiments.

[0031] The pulverized coal gasification flash evaporation system disclosed herein includes a flash tank 1, a level gauge 2, a first inlet water pipe 5, and a drain water pipe 6. The level gauge 2 is connected to the high-pressure side of the flash tank 1 via the first pipe and to the low-pressure side of the flash tank 1 via a second pipe 4. The first inlet water pipe 5 is connected to the first pipe. The drain water pipe 6 is connected to the first pipe via a programmable valve 61 and is located downstream of the first inlet water pipe 5. The programmable valve 61 is configured to open only when the actual detection value of the level gauge 2 reaches a preset blockage value. The liquid pressure in the first inlet water pipe 5 is greater than the liquid pressure entering the first pipe from the flash tank 1.

[0032] Specifically, the level gauge 2 disclosed herein is a differential pressure level gauge. The flash tank 1 has a high-pressure side port located at the bottom, which is connected to the level gauge 2 via a first pipeline. Liquid black water is introduced into the level gauge 2 through the first pipeline, contacting the pressure sensing element at the lower end of the level gauge 2 to detect the pressure of the liquid phase inside the flash tank 1. The flash tank 1 also has a low-pressure side port located at the top, which is connected to the level gauge 2 via a second pipeline 4. Gas flash vapor is introduced into the level gauge 2 through the second pipeline 4, contacting the pressure sensing element at the upper end of the level gauge 2 to detect the pressure of the gas phase inside the flash tank 1.

[0033] According to Pascal's Law, the formula for liquid pressure is: P = ρgh, where P is the liquid pressure in Pa and ρ is the liquid density in kg / m³. 3 g refers to the acceleration due to gravity, with units of m / s². 2 h refers to the liquid level height, with units of meters (m). The liquid level gauge 2 measures the pressure of the liquid phase at the bottom of the flash tank 1 and the pressure of the gas phase at the top of the flash tank 1, and calculates the pressure difference between the two as ΔP. ​​According to the modified formula ΔP=ρgh: h=ΔP / (ρg), the liquid level height inside the flash tank 1 can be obtained.

[0034] Both the first inlet pipe 5 and the drain pipe 6 are connected to the first pipe. The drain pipe 6 is located downstream of the first inlet pipe 5, determined by the flow direction of the black water entering the first pipe. If the drain pipe 6 were located upstream of the first inlet pipe 5, the black water and flushing water would flow out through the drain pipe 6. Since the drain pipe 6 is the main pressure relief outlet, the flushing water would reach less of the first pipe near the flash tank 1, failing to solve the blockage problem. In this disclosure, the drain pipe 6 is located downstream of the first inlet pipe 5. Because the liquid pressure in the first inlet pipe 5 is greater than the liquid pressure entering the first pipe from the flash tank 1, the flushing water enters the first pipe near the flash tank 1, then enters the side near the level gauge 2, and is simultaneously discharged through the drain pipe 6, achieving the purpose of cleaning the pipe and preventing blockage.

[0035] The programmable valve 61 of the drain pipe 6 is only opened when the actual detection value of the level gauge 2 reaches the blockage preset value. When the first pipe between the level gauge 2 and the flash tank 1 is completely blocked, or not completely blocked but with obstruction, the liquid phase pressure of the flash tank 1 detected at the lower end of the level gauge 2 decreases, and the actual detection value of the level gauge 2, i.e., the liquid level height, decreases. When the actual detection value is less than or equal to the blockage preset value, it indicates that there is a blockage at the root of the level gauge 2. The drain pipe 6 is opened to increase the flow pressure of the flushing water in the first pipe, which drives the solid particles inside the first pipe to flow out through the drain pipe 6.

[0036] In this disclosure, the liquid level detected by level gauge 2 is converted by a computer into a percentage of the height of flash tank 1. 45% is considered the normal actual detection value, and the system generally maintains this value during normal operation. A blockage preset value of 25% is set. When the detected liquid level is below 25%, a blockage is identified in the first pipeline, and programmable valve 61 opens. It should be noted that the 45% and 25% values ​​in this disclosure are only one set of liquid level values ​​and are affected by factors such as the volume of flash tank 1 and local atmospheric pressure. In practical applications, the normal detection value and blockage preset value should be redefined based on the process and equipment conditions.

[0037] Using the pulverized coal gasification flash evaporation system disclosed herein, level gauge 2 is connected to flash tank 1 via a first pipeline and a second pipeline 4. The pressures of the liquid and gas phases inside flash tank 1 are measured respectively, and the liquid level height of flash tank 1 is calculated. A first inlet water pipeline 5 and a drain water pipeline 6 are connected to the first pipeline, and the programmable valve 61 of the drain water pipeline 6 is closed. When blockage occurs in the first pipeline, the actual detection value of level gauge 2 changes until it reaches the preset blockage value, at which point the programmable valve 61 is opened. Since the drain water pipeline 6 is located downstream of the first inlet water pipeline 5, and the liquid pressure in the first inlet water pipeline 5 is greater than the liquid pressure entering the first pipeline from flash tank 1, the liquid in the first inlet water pipeline 5 flows rapidly, flushing the first pipeline and level gauge 2, and then flows out from the drain water pipeline 6. By adding the drain water pipeline 6, the flushing water in the first inlet water pipeline 5 is rapidly depressurized in the drain water pipeline 6, increasing the flow rate of the liquid in the first pipeline, improving the cleaning ability of the flushing water, reducing the possibility of blockage, and avoiding safety hazards caused by disassembly and unclogging.

[0038] In one embodiment, the pulverized coal gasification flash evaporation system further includes a second water inlet pipe 7, which is connected to the second pipe 4.

[0039] Specifically, the second water inlet pipe 7 and the first water inlet pipe 5 have the same source of flushing water. The second water inlet pipe 7 is connected to the second pipe 4 and flushing water is introduced. Since the second pipe 4 is connected to the level gauge 2, it is mainly used to detect the pressure of the gas phase in the flash tank 1. Therefore, there are no large amounts of solid particles, and only flushing water is introduced for rinsing. The flushing water returns to the flash tank 1 through the second pipe 4 and can be reused for evaporation.

[0040] In one embodiment, the pulverized coal gasification flash evaporation system further includes a flow guide tee 8. The first pipeline includes a first pipeline section 31 and a second pipeline section 32. One port of the first pipeline section 31 is connected to the high-pressure side of the flash tank 1, and the other port is connected to the first port of the flow guide tee 8. One port of the second pipeline section 32 is connected to the level gauge 2, and the other port is connected to the second port of the flow guide tee 8. The third port of the flow guide tee 8 is connected to the drainage pipeline 6 through a programmable valve 61.

[0041] Specifically, the first pipeline is divided into a first pipeline section 31 and a second pipeline section 32. The first pipeline section 31 is located on the upstream side, with one port connected to the high-pressure side of the flash tank 1 and the other port connected to the first port of the guide tee 8. The second pipeline section 32 is located on the downstream side, with one port connected to the level gauge 2 and the other port connected to the second port of the guide tee 8. The black water in the flash tank 1 first enters the first pipeline section 31, reaches the guide tee 8, and then enters the second pipeline section 32, reaching the level gauge 2. The drain pipeline 6 is connected to the third port of the guide tee 8 through a programmable valve 61. When the programmable valve 61 is opened, the black water flows out through the first pipeline section 31 and the guide tee 8 into the drain pipeline 6.

[0042] The flow guide tee 8 can change the direction of the first pipe section 31, the second pipe section 32, and the drainage pipe 6. For example, a 45° angled tee can be used to reduce the pressure loss of liquid entering the drainage pipe 6. At the same time, a wear-resistant coating, such as a tungsten carbide coating, can be installed inside the flow guide tee 8 to preferentially contact solid particles in the black water, protect the first pipe and the drainage pipe 6, greatly improve the service life of the pipes, and reduce the number of disassemblies.

[0043] In one embodiment, the top of the flash tank 1 also includes a gas outlet, which is connected to the first water inlet pipe 5 and the second water inlet pipe 7 via a condenser pipe 9.

[0044] Specifically, the vent is used to discharge the flash steam in the flash tank 1. The flash steam is cooled into liquid by the condenser 9 and then returned to the first water inlet pipe 5 and the second water inlet pipe 7 as reused flushing water. This design greatly reduces the cost of using new water sources and also reduces the generation of new wastewater.

[0045] In one embodiment, a first switching valve 33 is provided on the first pipeline, and a second switching valve 41 is provided on the second pipeline 4; both the first switching valve 33 and the second switching valve 41 are normally open and are only closed when the flash tank 1 and the level gauge 2 are under maintenance.

[0046] Specifically, both the first switch valve 33 and the second switch valve 41 are normally open, allowing black water and flash steam to enter the level gauge 2 through the first and second pipelines 4 for pressure detection. They are only closed when disassembly and inspection are required, stopping the delivery of black water to the first pipeline and the delivery of flash steam to the second pipeline 4.

[0047] In one embodiment, the first water inlet pipe 5 is provided with a first shut-off valve 51, and the second water inlet pipe 7 is provided with a second shut-off valve 71; both the first shut-off valve 51 and the second shut-off valve 71 are normally open and are only closed when the flash tank 1 and the level gauge 2 are under maintenance.

[0048] Specifically, both the first shut-off valve 51 and the second shut-off valve 71 are normally open, and the first water inlet pipe 5 and the second water inlet pipe 7 are always supplied with flushing water. They are only closed when disassembly and inspection are required, stopping the supply of flushing water to the first water inlet pipe 5 and the second water inlet pipe 7.

[0049] In addition, the shut-off valve can be used for simple pressure regulation by being closed, which can change the pressure of the flushing water.

[0050] In one embodiment, the drain pipe 6 is connected to the floor drain 10 via a water inlet hose.

[0051] Specifically, one port of the drainage pipe 6 is connected to the third port of the guide tee 8, and the other port is connected to the floor drain 10 via a water-connecting hose. The water-connecting hose is a fire hose, which has the characteristics of high strength, wear resistance and high pressure resistance, and is protected from damage by solid particles in the black water.

[0052] In one embodiment, the axis of the second pipe section 32 forms an acute angle of 45°-60° with the axis of the drainage pipe 6.

[0053] Specifically, the second pipe section 32 is connected to the drainage pipe 6 via a guide tee 8. Common guide tees 8 are typically 90° angled; however, due to an important specification in drainage construction, when conditions permit, oblique tees should be preferred over straight tees. Furthermore, a 45° angle design should be used whenever possible, rather than a 90° angle.

[0054] In detail, the advantages of this setting are firstly that it reduces resistance and turbulence. Compared with a 90° positive tee, a 45° oblique tee provides a smoother transition path, reduces local resistance and turbulence when the fluid turns, reduces pressure loss by 30%-50%, improves drainage efficiency, and allows flushing water and black water to pass through the drainage pipe more smoothly.

[0055] Secondly, it reduces the risk of sediment buildup. Because a 45° angled tee provides a more natural flow change, it helps reduce the deposition of solid particles inside the pipe. In contrast, a 90° straight tee is more likely to cause solid particles to accumulate at the bend, potentially causing blockages in the drain pipe. This not only fails to solve the problem of blockage at the base of the level gauge but also creates new blockages, increasing the frequency of maintenance.

[0056] Finally, the cleaning ability is improved. The water flow can maintain a high speed when passing through the 45° angled tee, which can more effectively remove fixed particles in the first pipe and achieve the function of clearing blockages.

[0057] During drainage construction, regardless of whether in-floor or inter-floor drainage is used, a key specification should be followed: when conditions permit, angled tees should be preferred over standard tees. Furthermore, 45-degree angles should be prioritized in the design, avoiding the use of 90-degree angles. In one embodiment, the programmable valve 61 has an internal wear-resistant coating.

[0058] Specifically, the programmable valve 61 is used to control the opening and closing of the drainage pipe 6. The liquid in the drainage pipe 6 mainly includes flushing water and black water. The black water mainly contains incompletely burned or gasified coal powder and carbon black, as well as residual silicates, aluminates, and other metal oxides from the minerals in the coal after high-temperature combustion or gasification. To achieve the flushing purpose, the black water has a high flow rate, and some solids in the black water have high hardness. Prolonged contact with the black water causes severe wear on the programmable valve 61, resulting in a short service life. Therefore, a wear-resistant coating, such as a tungsten carbide coating, is installed inside the programmable valve 61. This coating preferentially contacts the solid particles in the black water, protecting the main body of the programmable valve 61 and greatly improving its service life, reducing maintenance time caused by replacing the programmable valve 61. Furthermore, it significantly reduces equipment maintenance costs, making it more economical than replacing the programmable valve 61.

[0059] In one embodiment, the pulverized coal gasification flash evaporation system further includes a control element 11, which is communicatively connected to the level gauge 2 and the programmable valve 61, and is configured to acquire the actual detection value of the level gauge 2. When the actual detection value is less than or equal to a blockage preset value, the control element 11 controls the programmable valve 61 to open. After the programmable valve 61 has been open for a preset time, the programmable valve 61 is closed, and the above process is repeated until the actual detection value is greater than the blockage preset value when the programmable valve 61 is closed.

[0060] Specifically, the control element 11 can be a PLC controller and is connected to the level gauge 2 and the programmable valve 61 to obtain the actual detection value of the level gauge 2. When the actual detection value is less than or equal to the blockage preset value, a blockage occurs in the first pipeline. The control element 11 controls the programmable valve 61 to open. Since the outside of the drain pipeline 6 is at atmospheric pressure, the pressure is much lower than the liquid phase pressure at the closed end of the level gauge 2 and in the flash tank 1. The flushing water and black water are mainly discharged through the drain pipeline 6 to relieve pressure, which affects the detection of the level gauge 2 at this time.

[0061] After the programmable valve 61 has been open for a preset time, the control element 11 controls the programmable valve 61 to close. At this time, without the influence of the drain pipe 6, the level gauge 2's detection is unaffected. If the actual detected value is still less than or equal to the blockage preset value, the programmable valve 61 is reopened, and this process is repeated until the actual detected value is greater than the blockage preset value when the programmable valve 61 is closed, indicating that the blockage is completely eliminated. This setting avoids the influence of the drain pipe 6 on the level gauge 2's detection and prevents false readings caused by unresolved blockages.

[0062] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein. The scope of this disclosure is defined by the appended claims.

Claims

1. A pulverized coal gasification flash evaporation system, characterized in that, The pulverized coal gasification flash evaporation system includes: Flash evaporator (1); The level gauge (2) is connected to the high-pressure side of the flash tank (1) through a first pipeline and to the low-pressure side of the flash tank (1) through a second pipeline (4). First water inlet pipe (5), the first water inlet pipe (5) is connected to the first pipe; The drainage pipe (6) is connected to the first pipe through a programmable valve (61) and is located downstream of the first water inlet pipe (5). The programmable valve (61) is configured to be opened only when the actual detection value of the level gauge (2) reaches the blockage preset value. A control element (11) is communicatively connected to the level gauge (2) and the programmable valve (61), and is configured to acquire the actual detection value of the level gauge (2), and when the actual detection value is less than or equal to the blockage preset value, control the programmable valve (61) to open, and after the programmable valve (61) has been open for a preset time, close the programmable valve (61), and repeat the above process until the actual detection value is greater than the blockage preset value when the programmable valve (61) is closed; The liquid pressure in the first water inlet pipe (5) is greater than the liquid pressure entering the first pipe from the flash tank (1).

2. The pulverized coal gasification flash evaporation system according to claim 1, characterized in that, The pulverized coal gasification flash evaporation system also includes a second water inlet pipe (7), which is connected to the second pipe (4).

3. The pulverized coal gasification flash evaporation system according to claim 2, characterized in that, The pulverized coal gasification flash evaporation system also includes a flow guide tee (8). The first pipeline includes a first pipeline section (31) and a second pipeline section (32). One port of the first pipeline section (31) is connected to the high-pressure side of the flash tank (1), and the other port is connected to the first port of the flow guide tee (8). One port of the second pipeline section (32) is connected to the level gauge (2), and the other port is connected to the second port of the flow guide tee (8). The third port of the flow guide tee (8) is connected to the drainage pipeline (6) through the programmable valve (61).

4. The pulverized coal gasification flash evaporation system according to claim 3, characterized in that, The top of the flash tank (1) also includes an air outlet, which is connected to the first water inlet pipe (5) and the second water inlet pipe (7) through a condenser pipe (9).

5. The pulverized coal gasification flash evaporation system according to claim 3, characterized in that, The first pipeline is equipped with a first switching valve (33), and the second pipeline (4) is equipped with a second switching valve (41). Both the first switching valve (33) and the second switching valve (41) are normally open and are only closed when the flash tank (1) and the level gauge (2) are being inspected.

6. The pulverized coal gasification flash evaporation system according to claim 5, characterized in that, The first water inlet pipe (5) is equipped with a first shut-off valve (51), and the second water inlet pipe (7) is equipped with a second shut-off valve (71). Both the first shut-off valve (51) and the second shut-off valve (71) are normally open and are only closed when the flash tank (1) and the level gauge (2) are being inspected.

7. The pulverized coal gasification flash evaporation system according to claim 3, characterized in that, The drainage pipe (6) is connected to the floor drain (10) via a water inlet hose.

8. The pulverized coal gasification flash evaporation system according to claim 3, characterized in that, The axis of the second pipeline section (32) forms an acute angle of 45°-60° with the axis of the drainage pipeline (6).

9. The pulverized coal gasification flash evaporation system according to claim 3, characterized in that, The programmable valve (61) has a wear-resistant coating inside.

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