A coal gas desulfurization tower rich liquid cavity airtight steady flow and pressure stabilizing device and method

Abstract

The present application relates to a kind of coal gas desulfurization tower rich liquid cavity airtight steady flow stabilizing device, bag tower body (1), the lower part of tower body (1) is equipped with rich liquid cavity (2), the side of tower body (1) is connected with coal gas inlet pipeline (3), the top of tower body (1) is connected with fine desulfurization coal gas outlet pipeline (4), rich liquid cavity (2) is connected with a gas-liquid separation tank (6) by first pressure balance pipeline (5), gas-liquid separation tank (6) is connected with fine desulfurization coal gas outlet pipeline (4) by second pressure balance pipeline (7).The present application has the advantages that the internal pressure of rich liquid cavity of desulfurization tower is balanced by pressure balance pipeline and gas-liquid separation tank, which avoids the risks of coal gas overflow, circulating pump cavitation, tower body damage and rich liquid backflow caused by internal pressure change of cavity, and the structure is simple, can be automatically adjusted, closed operation, self-steady flow and pressure stabilization, convenient operation, safe and reliable.

Description

Technical Field

[0001] This invention relates to the field of auxiliary equipment technology for desulfurization towers, and in particular to a closed-loop flow stabilization and pressure stabilization device and method for the rich liquid chamber of a coal gas desulfurization tower. Background Technology

[0002] To facilitate unified processing and reduce energy consumption and efficiency, the current coke oven gas desulfurization process generally adopts source desulfurization treatment, and the desulfurized gas that meets the standards is then sent to downstream users. The main tower and tank equipment in the source desulfurization process is arranged according to the actual site conditions. The desulfurization tower, regeneration tank, lean liquor tank, and rich liquor tank can be arranged individually or in combination.

[0003] Due to space constraints in the coke oven gas operating area, the coke oven gas source desulfurization process typically places the rich liquor tank at the bottom of the desulfurization tower, forming the rich liquor cavity of the integrated desulfurization tower. The rich liquor cavity has a relatively small capacity, while the circulating pump flow rate is relatively high, resulting in a rich liquor residence time of less than 10 minutes. Fluctuations in inlet gas pressure and flow rate, lean liquor spray volume, and rich liquor extraction volume can easily cause pressure changes in the rich liquor cavity. If the cavity pressure is not balanced in time, it can lead to gas leakage, circulating pump cavitation, tower damage, and rich liquor backflow into the gas pipes. Since the gas inside the cavity is flammable and explosive entrained in the rich liquor, the system must comprehensively consider how to operate in a closed system while ensuring no gas leakage, achieving stable pressure and flow, and guaranteeing the system's safety and reliability. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of pressure imbalance, large fluctuations, and high safety hazards in the rich liquid chamber of existing desulfurization towers. It provides a closed flow and pressure stabilization device for the rich liquid chamber of a coal gas desulfurization tower, which can realize autonomous flow and pressure stabilization and regulation of the rich liquid chamber pressure, thereby improving the safety of equipment operation.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A closed-loop flow and pressure stabilization device for the rich liquid chamber of a coal gas desulfurization tower includes a tower body, a rich liquid chamber at the bottom of the tower body, a coal gas inlet pipeline connected to the side of the tower body, and a fine desulfurized coal gas outlet pipeline connected to the top of the tower body. The rich liquid chamber is connected to a gas-liquid separator through a first pressure balancing pipeline, and the gas-liquid separator is then connected to the fine desulfurized coal gas outlet pipeline through a second pressure balancing pipeline.

[0007] Furthermore, the gas-liquid separator is provided with a gas inlet 1 on the side and a gas inlet 2 on the top. The gas inlet 1 is connected to the first pressure balance pipeline, and the gas inlet 2 is connected to the second pressure balance pipeline. The upper part of the gas-liquid separator is also provided with a water collector to remove the rich liquid entrained in the gas.

[0008] Furthermore, the water collector fully covers the cross-section of the gas-liquid separator and is located above the first gas inlet and below the second gas inlet. The water collector is a baffle plate demister or a wire mesh demister.

[0009] Furthermore, the bottom of the gas-liquid separator is provided with a solution port, which is connected to a return pipe. The return pipe is connected to the liquid side of the rich liquid chamber, so as to return the rich liquid in the coal gas collected by the water collector to the rich liquid chamber.

[0010] Furthermore, the height of the gas-liquid separator is higher than the liquid level of the rich liquid chamber, and the bottom of the gas-liquid separator is 0.5m away from the liquid level H of the rich liquid chamber to prevent the liquid in the rich liquid chamber from overflowing.

[0011] Furthermore, a pressure gauge is provided above the rich liquid chamber to monitor the internal pressure of the rich liquid chamber.

[0012] To further achieve the objectives of this invention, a closed-loop flow and pressure stabilization method for the rich liquid chamber of a coal gas desulfurization tower is also provided. Using the aforementioned flow and pressure stabilization device, the specific steps are as follows:

[0013] When the pressure gauge shows that the inside of the rich liquid chamber is under positive pressure and gradually increases to exceed the pressure of the fine desulfurized gas outlet pipeline, the gas at the top of the rich liquid chamber is discharged through the first pressure balance pipeline and enters the water collector in the gas-liquid separator from the first gas pipe port. After separating the solution entrained in the gas, it continues to be discharged through the second gas pipe port to the second pressure balance pipeline, and then enters the fine desulfurized gas outlet pipeline until the pressure gauge shows that the internal pressure of the rich liquid chamber is equal to the pressure of the fine desulfurized gas outlet pipeline, forming a self-sealing pressure stabilization and thus stabilizing the flow.

[0014] Furthermore, when the gas at the top of the rich liquid chamber enters the water collector, the solution captured by the water collector flows back to the return pipe through the solution port and is finally discharged to the liquid side of the rich liquid chamber.

[0015] Furthermore, when the pressure gauge shows that the internal pressure of the rich liquid chamber is less than the pressure of the fine desulfurized gas outlet pipeline, the gas in the fine desulfurized gas outlet pipeline enters the gas-liquid separator through the second pressure balance pipeline through the second gas pipe port. The gas passes through the water collector and is discharged from the first gas pipe port to the first pressure balance pipeline, and then enters the top of the rich liquid chamber until the pressure gauge shows that the internal pressure of the rich liquid chamber is equal to the pressure of the fine desulfurized gas outlet pipeline, thus forming a self-sealing pressure stabilization and flow stabilization.

[0016] Compared with the prior art, the advantages of the technical solution of the present invention are as follows:

[0017] (1) The closed flow and pressure stabilization device of the rich liquid chamber of the gas desulfurization tower is connected to the fine desulfurized gas outlet pipeline and the rich liquid chamber by setting up a pressure balance pipeline. The pressure is balanced by the balance pipeline, which avoids problems such as cavitation of the circulating pump, tower damage, and backflow of rich liquid into the gas pipe caused by the untimely pressure balance of the rich liquid chamber.

[0018] (2) When the pressure in the rich liquid chamber is high, the gas in the rich liquid chamber is discharged autonomously to the gas desulfurization pipeline through the pressure balance pipeline, and the entrained solution is removed by the gas-liquid separator until the pressure is balanced, so as to avoid problems such as backflow of rich liquid into the gas pipe, gas overflow, and cavitation of the circulating pump caused by excessive pressure in the rich liquid chamber, and to achieve the effect of closed pressure stabilization and flow stabilization.

[0019] (3) When the pressure in the rich liquid cavity is low, the fine desulfurized coal gas is automatically injected into the rich liquid cavity through the pressure balance pipeline until the pressure is balanced, so as to avoid the problem of high resistance to rich liquid discharge caused by excessive negative pressure in the rich liquid cavity and achieve the effect of closed pressure and stable flow. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the closed flow and pressure stabilization device for the rich liquid chamber of the gas desulfurization tower according to the present invention. Implementation Example

[0021] To make the present invention clearer, the following description, in conjunction with the accompanying drawings, further illustrates a closed-loop flow and pressure stabilization device and method for a coal gas desulfurization tower with a rich liquid cavity. The specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0022] See Figure 1 A closed-loop flow and pressure stabilizing device for the rich liquid chamber of a coal gas desulfurization tower includes a tower body 1, a rich liquid chamber 2 at the lower part of the tower body 1, a coal gas inlet pipe 3 connected to the side of the tower body 1, and a fine desulfurized coal gas outlet pipe 4 connected to the top of the tower body 1. Its features are:

[0023] The top of the rich liquid chamber 2 is connected to the first pressure balance pipeline 5, which is connected to the gas port 6a on the side of the gas-liquid separator 6. The top of the gas-liquid separator 6 is provided with a second gas port 6b, which is then connected to the fine desulfurized gas outlet pipeline 4 through the second pressure balance pipeline 7.

[0024] Since the gas at the top of the rich liquid chamber carries solution, it is necessary to separate the gas and liquid. A water collector 8 is installed inside the gas-liquid separator 6, which covers the entire cross-section of the gas-liquid separator 6 without any gaps or dead corners. The water collector 8 is located above the gas inlet 6a and below the gas inlet 6b. The water collector 8 is a baffle plate demister or a wire mesh demister.

[0025] The bottom of the gas-liquid separator 6 is provided with a solution port 6c, which is connected to a return pipe 9. The return pipe 9 is connected to the liquid side of the rich liquid chamber 2, so as to return the rich liquid in the coal gas collected by the dewatering collector to the rich liquid chamber.

[0026] To prevent the liquid in the rich liquid chamber 2 from overflowing, the height of the gas-liquid separator 6 is higher than the liquid level in the rich liquid chamber 2. The bottom of the gas-liquid separator 6 is 0.5m away from the liquid level H in the rich liquid chamber 2, and a pressure gauge 10 is provided above the rich liquid chamber 2 to monitor the internal pressure of the rich liquid chamber.

[0027] The working principle of this invention is as follows: During normal operation, coal gas enters the tower body 1 through the coal gas inlet pipe 3, flows counter-currently and reacts with the lean liquid, then enters the next process through the fine desulfurization coal gas outlet pipe 4. After the lean liquid absorbs and reacts, it forms a rich liquid, which enters the rich liquid chamber 2. The rich liquid inevitably carries some coal gas, which evaporates and accumulates at the top of the rich liquid chamber 2. At this time, the pressure gauge 10 shows that the inside of the rich liquid chamber 2 is under positive pressure, and gradually increases to a pressure greater than that of the fine desulfurization coal gas outlet pipe 4. The coal gas at the top of the rich liquid chamber 2 is discharged through the first pressure balance pipe 5, and enters the water collector 8 in the gas-liquid separator 6 through the coal gas port 6a. After separating the solution carried in the coal gas, it continues to be discharged through the second coal gas port 6b to the second pressure balance pipe 7, and then enters the fine desulfurization coal gas outlet pipe 4, until the pressure gauge 10 shows that the internal pressure of the rich liquid chamber 2 is equal to the pressure of the fine desulfurization coal gas outlet pipe 4, forming a self-sealing pressure stabilization and thus stabilizing the flow. When the gas at the top of the rich liquid chamber 2 enters the water collector 8, the solution captured by the water collector 8 flows back to the return pipe 9 through the solution port 6c, and is finally discharged to the liquid side of the rich liquid chamber 2.

[0028] When pressure gauge 10 shows that the internal pressure of the rich liquid chamber 2 is less than the pressure of the fine desulfurized gas outlet pipeline 4, the gas in the fine desulfurized gas outlet pipeline 4 enters the gas-liquid separator 6 through the second pressure balance pipeline 7 and gas port 6b. The gas passes through the water collector 8 and is discharged through gas port 6a to the first pressure balance pipeline 5, and then enters the top of the rich liquid chamber 2 until pressure gauge 10 shows that the internal pressure of the rich liquid chamber 2 is equal to the pressure of the fine desulfurized gas outlet pipeline 4, thus forming a self-sealing pressure stabilization and flow stabilization.

[0029] The device of this invention controls the internal pressure of the rich liquid chamber of the desulfurization tower through a pressure balancing pipeline and a gas-liquid separator, avoiding risks such as gas overflow, circulating pump cavitation, tower damage, and rich liquid backflow caused by pressure changes inside the chamber. The overall structure is simple, automatically adjustable, operates in a closed system, and is self-regulating in flow and pressure. It is convenient to operate and safe and reliable, and is worthy of promotion and use. This invention can ensure closed operation without gas overflow, effectively achieving the effect of stabilizing pressure and flow, and ensuring the safe and reliable operation of the system.

[0030] In addition to the embodiments described above, the present invention may have other implementations. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A closed-loop flow and pressure stabilizing device for a gas desulfurization tower with a rich liquid chamber, comprising a tower body (1), a rich liquid chamber (2) at the lower part of the tower body (1), a gas inlet pipe (3) connected to the side of the tower body (1), and a fine desulfurized gas outlet pipe (4) connected to the top of the tower body (1), characterized in that: The rich liquid chamber (2) is connected to a gas-liquid separator (6) through the first pressure balance pipeline (5), and the gas-liquid separator (6) is then connected to the fine desulfurized coal gas outlet pipeline (4) through the second pressure balance pipeline (7). The gas-liquid separator (6) has a gas inlet 1 (6a) on its side and a gas inlet 2 (6b) on its top. The gas inlet 1 (6a) is connected to the first pressure balance pipeline (5), and the gas inlet 2 (6b) is connected to the second pressure balance pipeline (7). The upper part of the gas-liquid separator (6) is also equipped with a water collector (8). The water collector (8) covers the cross-section of the gas-liquid separator (6) and is located above the first gas inlet (6a) and below the second gas inlet (6b). The water collector (8) is a folding plate demister or a wire mesh demister. The bottom of the gas-liquid separator (6) is provided with a solution port (6c), which is connected to a return pipe (9). The return pipe (9) is connected to the liquid side of the rich liquid chamber (2).

2. The closed-loop flow and pressure stabilizing device for the rich liquid chamber of a gas desulfurization tower according to claim 1, characterized in that: The height of the gas-liquid separator (6) is higher than the liquid level of the rich liquid chamber (2), and the bottom of the gas-liquid separator (6) is 0.5m away from the liquid level H of the rich liquid chamber (2).

3. The closed-loop flow and pressure stabilizing device for the rich liquid chamber of a gas desulfurization tower according to claim 1, characterized in that: A pressure gauge (10) is provided above the rich liquid chamber (2).

4. A method for closed-loop flow and pressure stabilization in the rich liquid chamber of a coal gas desulfurization tower using the apparatus described in claim 1, comprising the following specific steps, characterized in that: When the pressure gauge (10) shows that the inside of the rich liquid chamber (2) is under positive pressure and gradually increases to be greater than the pressure of the fine desulfurized gas outlet pipeline (4), the gas at the top of the rich liquid chamber (2) is discharged through the first pressure balance pipeline (5), enters the water collector (8) in the gas-liquid separator (6) through the first gas pipe port (6a), separates the solution entrained in the gas, and continues to be discharged through the second gas pipe port (6b) to the second pressure balance pipeline (7), and then enters the fine desulfurized gas outlet pipeline (4) until the pressure gauge (10) shows that the internal pressure of the rich liquid chamber (2) is equal to the pressure of the fine desulfurized gas outlet pipeline (4), forming a self-sealing pressure stabilization and thus stabilizing the flow.

5. The closed-loop flow and pressure stabilization method for the rich liquid chamber of a coal gas desulfurization tower according to claim 4, characterized in that: When the gas at the top of the rich liquid chamber (2) enters the water collector (8), the solution captured by the water collector (8) flows back to the return pipe (9) through the solution port (6c) and is finally discharged to the liquid side of the rich liquid chamber (2).

6. The closed-loop flow and pressure stabilization method for the rich liquid chamber of a coal gas desulfurization tower according to claim 5, characterized in that: When the pressure gauge (10) shows that the internal pressure of the rich liquid chamber (2) is less than the pressure of the fine desulfurized gas outlet pipeline (4), the gas in the fine desulfurized gas outlet pipeline (4) enters the gas-liquid separator (6) through the second pressure balance pipeline (7) from the gas port two (6b). The gas passes through the water collector (8) and is discharged from the gas port one (6a) to the first pressure balance pipeline (5), and then enters the top of the rich liquid chamber (2) until the pressure gauge (10) shows that the internal pressure of the rich liquid chamber (2) is equal to the pressure of the fine desulfurized gas outlet pipeline (4), forming a self-sealing pressure stabilization and thus stabilizing the flow.

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