Pressure swing adsorption system with adjustment function in pressure equalizing process

Abstract

The utility model discloses a pressure swing adsorption system with an adjustable pressure equalizing process, which relates to the technical field of pressure swing adsorption and comprises a raw material gas conveying pipe, an adsorption tower internally provided with filler, a product gas output pipe, a pressure equalizing mechanism connected onto the product gas output pipe, and a reverse pressure reducing pipe connected with the lower end of the adsorption tower, the regeneration mechanism can realize regeneration of the filler in the adsorption tower; and a pressure equalizing regulating valve is arranged in the pressure equalizing mechanism. The regulating valve is arranged in the pressure equalizing mechanism, so that the pressure change in the pressure equalizing process is controllable, the pressure equalizing process can be stably carried out at a uniform speed, and the problems that the pressure in the pressure equalizing process in the conventional pressure swing adsorption process cannot be regulated, the initial pressure equalizing speed is too high, so that an adsorbent boils, and the sealing surface of the program control valve is greatly scoured can be solved; and noise generated in the pressure equalizing process can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure swing adsorption, in particular to a pressure swing adsorption system with regulation during a pressure equalization process. Background Art

[0002] Currently, pressure swing adsorption (PSA) technology is widely used in industries such as oil refining and the chemical industry. Generally speaking, the higher the adsorption pressure, the more pressure equalization cycles are required, while the lower the adsorption pressure, the fewer pressure equalization cycles are required. The process of pressure equalization, either stepping down or stepping up, inevitably erodes the adsorbent and the programmable valve, impacting the overall lifespan of the system. Systems with higher adsorption pressures often experience greater pressure differentials during the equalization process. Excessive pressure differentials during equalization can easily prevent the programmable valve from opening, limiting the application of PSA systems in high-pressure applications. Current PSA systems typically operate at pressures between 0.02 and 6 MPaG. Consequently, the requirements for PSA technology are becoming increasingly stringent. For example, excessively fast equalization can affect the lifespan of the adsorbent and damage the programmable valve, while excessively slow equalization can compromise the overall system performance. Effectively controlling the equalization rate to optimize the PSA system during equalization operations has become a critical challenge.

[0003] However, in practice, pressure equalization is often difficult to control. Existing pressure swing adsorption systems still struggle to accurately control the pressure equalization speed and time required for production. This can easily cause the adsorbent in the adsorption tower to boil and pulverize, damaging the programmable valve and shortening the adsorbent's lifespan. Furthermore, after tower pruning, the number of pressure equalization cycles decreases, leading to a greater pressure differential, which can lead to greater erosion and damage to the adsorbent, compromising system stability. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the existing technology and provide a pressure swing adsorption system with an adjustable pressure equalization process, which can make the pressure equalization process proceed at a stable and uniform speed, and solve the problems in the previous pressure swing adsorption process that the pressure of the pressure equalization process cannot be adjusted, the initial pressure equalization speed is too fast, resulting in boiling of the adsorbent and severe erosion of the sealing surface of the programmable valve.

[0005] In order to achieve the above purpose, the technical solution adopted by the present utility model is as follows:

[0006] A pressure swing adsorption system with regulation during the pressure equalization process comprises a raw gas transmission pipe, an adsorption tower with filler arranged inside, a product gas transmission pipe, a pressure equalization mechanism connected to the product gas transmission pipe, a reverse pressure-reducing pipe connected to the lower end of the adsorption tower, and a regeneration mechanism capable of regenerating the filler in the adsorption tower; a pressure equalization regulating valve is provided in the pressure equalization mechanism.

[0007] Furthermore, at least four adsorption towers are provided, and each adsorption tower is connected to the raw gas transmission pipe and the product gas external transmission pipe.

[0008] Furthermore, the pressure equalizing mechanism includes a pressure equalizing pipe connected to the product gas export pipe, and a booster pipe connected to the product gas export pipe; the end of the booster pipe not connected to the product gas export pipe is connected to the pressure equalizing pipe, and a pressure equalizing programmable valve is installed between the product gas export pipe and the pressure equalizing pipe, and the pressure equalizing regulating valve is arranged between the pressure equalizing programmable valve and the product gas export pipe.

[0009] Furthermore, two or more equalizing pressure pipes are provided and connected in parallel.

[0010] Furthermore, the regeneration mechanism is a flushing mechanism, including a flushing tank connected to the pressure equalizing pipe through a connecting pipe, a flushing common programmable valve installed on the connecting pipe between the pressure equalizing pipe and the flushing tank, a flushing inlet pipe connecting the flushing tank and the product gas transmission pipe, and a flushing outlet pipe connected to the bottom of the adsorption tower.

[0011] Furthermore, a flushing outlet program-controlled valve is installed on the flushing outlet pipe; a flushing inlet program-controlled valve is installed on the flushing inlet pipe, and a flushing regulating valve and a flushing pressure transmitter are also installed between the flushing inlet program-controlled valve and the flushing tank.

[0012] Furthermore, the regeneration mechanism is a vacuum regeneration mechanism.

[0013] Furthermore, a raw gas program-controlled valve is installed on the raw gas transmission pipe, a product gas program-controlled valve is installed on the product gas external transmission pipe, a reverse program-controlled valve is installed on the reverse pressure-reducing pipe, and a boost regulating valve is installed on the boost pipe, and a pressure transmitter is installed on each adsorption tower.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] (1) The utility model sets a regulating valve in the pressure equalization mechanism, so that the pressure change of the pressure equalization process can be controlled, and the pressure equalization process can be carried out at a uniform and stable speed. It can solve the problem that the pressure of the pressure equalization process in the previous pressure swing adsorption process cannot be adjusted, the initial pressure equalization speed is too fast, resulting in boiling of the adsorbent and large erosion of the sealing surface of the programmable valve, and can also reduce the noise generated during the pressure equalization process; by setting the regulating valve, the pressure difference before and after the programmable valve can be reduced at the beginning of the pressure equalization process, thereby solving the problem that the programmable door cannot be opened due to the excessive pressure difference before and after the programmable valve at the beginning of the pressure equalization.

[0016] (2) The pressure swing adsorption system provided by the present invention can further reduce the number of pressure equalization times in the high-pressure pressure swing adsorption process. Reducing the number of pressure equalization times is beneficial to improving the purity of the product hydrogen and avoiding insufficient product purity caused by excessive pressure equalization times, thereby making the pressure swing adsorption process more applicable to a wider pressure range, and being suitable for pressure swing adsorption pressures between 0.02 and 8 MPaG. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of the pressure swing adsorption system provided by the utility model.

[0018] Among them, the names corresponding to the figure marks are: 1-raw gas transmission pipe, 2-adsorption tower, 3-product gas external transmission pipe, 4-equalizing pipe, 5-flushing tank, 6-flushing inlet pipe, 7-boosting pipe, 8-reverse pressure reducing pipe, 9-flushing outlet pipe, 10-raw gas program-controlled valve, 11-product gas program-controlled valve, 12-equalizing pressure program-controlled valve, 13-flushing common program-controlled valve, 14-flushing inlet program-controlled valve, 15-flushing outlet program-controlled valve, 16-reverse program-controlled valve, 17-equalizing pressure regulating valve, 18-boosting regulating valve, 19-flushing regulating valve, 20-pressure transmitter, 21-flushing pressure transmitter. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments. The present invention includes but is not limited to the following embodiments.

[0020] Example 1

[0021] like Figure 1 As shown, this embodiment provides a pressure swing adsorption system with regulation in a pressure equalization process, comprising a raw gas pipeline 1, four adsorption towers 2 connected to the raw gas pipeline 1 at the bottom, a product gas export pipeline 3 connected to the top of each adsorption tower 2, and a pressure equalization mechanism connected to each product gas export pipeline 3. Specifically, the pressure equalization mechanism includes a plurality of pressure equalization pipes 4 connected in parallel to each product gas export pipeline 3, a booster pipe 7 is connected to the product gas export pipeline 3, one of the pressure equalization pipes 4 is connected to the booster pipe 7, the product gas export pipeline 3 and the pressure equalization pipe 4 are connected through a connecting pipe, and a pressure equalization program-controlled valve 12 and a pressure equalization regulating valve 17 are installed on the connecting pipe. In this embodiment, the pressure equalization regulating valve 17 is arranged between the pressure equalization program-controlled valve 12 and the product gas export pipeline 3, wherein at least two pressure equalization pipes 4 are arranged, and preferably, three are arranged in this embodiment.

[0022] This embodiment is also provided with a flushing mechanism, a flushing mechanism having one end connected to the pressure equalizing mechanism and the other end connected to each product gas transmission pipe 3, and an inverted pressure reducing pipe 8 is connected to the bottom of each adsorption tower 2. The flushing mechanism includes a flushing tank 5 connected to one of the pressure equalizing pipes 4 through a connecting pipe, a flushing common program-controlled valve 13 installed on the connecting pipe between the pressure equalizing pipe 4 and the flushing tank 5, a flushing inlet pipe 6 connecting the flushing tank 5 and the product gas transmission pipe 3, a flushing inlet program-controlled valve 14 installed on the flushing inlet pipe 6, and a flushing outlet pipe 9 connected to the bottom of the adsorption tower 2. A flushing regulating valve 19 and a flushing pressure transmitter 21 are also installed between the flushing inlet program-controlled valve 14 and the flushing tank 5. Among them, the opening of the flushing regulating valve 19 can be controlled by software.

[0023] A raw gas programmable valve 10 is installed on the raw gas transmission pipe 1, a product gas programmable valve 11 is installed on the product gas transmission pipe 3, a reverse pressure-reducing valve 16 is installed on the reverse pressure-reducing pipe 8, a flush outlet programmable valve 15 is installed on the flush outlet pipe 9, and a boost regulating valve 18 is installed on the boost pipe 7. Furthermore, a pressure transmitter 20 is installed on the boost regulating valve 18 and each adsorption tower 2. In this embodiment, the opening of both the equalizing pressure regulating valve 17 and the boost regulating valve 18 can be controlled by software.

[0024] The pressure swing adsorption system provided in this embodiment includes four equalized pressure reduction processes and four equalized pressure increase processes during use. A regulating valve is provided in the pressure equalization mechanism at the top of the adsorption tower, and the regulating valve controls the pressure equalization speed of the adsorption tower according to the pressure of each adsorption tower. During use, the pressure swing adsorption system provided in this embodiment contains at least one adsorbent in the adsorption tower. Different types and quantities of adsorbents can be loaded depending on the feed gas being processed. The adsorption pressure is not less than 0.02 MPaG and not more than 8 MPaG.

[0025] Example 2

[0026] This embodiment provides a pressure swing adsorption system with regulation during the pressure equalization process. The system is otherwise identical to that of Example 1, except that regeneration is performed using a vacuum pumping mechanism. Specifically, the system does not include a flushing mechanism, which is replaced by a vacuum pumping mechanism. The vacuum pumping mechanism is of conventional design and will not be described in detail in this embodiment.

[0027] The above embodiment is only one of the preferred implementation methods of the present invention and should not be used to limit the scope of protection of the present invention. Any changes or modifications that have no substantive meaning made to the main design concept and spirit of the present invention, as long as the technical problems they solve are still consistent with the present invention, should be included in the scope of protection of the present invention.

Claims

1. A pressure swing adsorption system with pressure equalization process regulation, comprising a raw gas transmission pipe (1), an adsorption tower (2) with filler arranged inside, and a product gas transmission pipe (3), characterized in that: The invention also includes a pressure equalizing mechanism connected to the product gas transmission pipe (3), a reverse pressure reducing pipe (8) connected to the lower end of the adsorption tower (2), and a regeneration mechanism capable of regenerating the filler in the adsorption tower (2); a pressure equalizing regulating valve (17) is provided in the pressure equalizing mechanism.

2. A pressure swing adsorption system with pressure equalization process adjustment according to claim 1, characterized in that: At least four adsorption towers (2) are provided, and each adsorption tower (2) is connected to a raw gas transmission pipe (1) and a product gas external transmission pipe (3).

3. A pressure swing adsorption system with pressure equalization process adjustment according to claim 2, characterized in that: The pressure equalizing mechanism comprises a pressure equalizing pipe (4) connected to the product gas transmission pipe (3), and a booster pipe (7) connected to the product gas transmission pipe (3); the end of the booster pipe (7) not connected to the product gas transmission pipe (3) is connected to the pressure equalizing pipe (4); a pressure equalizing program-controlled valve (12) is installed between the product gas transmission pipe (3) and the pressure equalizing pipe (4); and a pressure equalizing regulating valve (17) is arranged between the pressure equalizing program-controlled valve (12) and the product gas transmission pipe (3).

4. A pressure swing adsorption system with pressure equalization process adjustment according to claim 3, characterized in that: The pressure equalizing pipes (4) are provided in two or more numbers and are connected in parallel.

5. A pressure swing adsorption system with pressure equalization process adjustment according to claim 4, characterized in that: The regeneration mechanism is a flushing mechanism, comprising a flushing tank (5) connected to a pressure equalizing pipe (4) via a connecting pipe, a flushing common program-controlled valve (13) installed on the connecting pipe between the pressure equalizing pipe (4) and the flushing tank (5), a flushing inlet pipe (6) connecting the flushing tank (5) and a product gas transmission pipe (3), and a flushing outlet pipe (9) connected to the bottom of the adsorption tower (2).

6. A pressure swing adsorption system with pressure equalization process adjustment according to claim 5, characterized in that: A flushing outlet program-controlled valve (15) is installed on the flushing outlet pipe (9); a flushing inlet program-controlled valve (14) is installed on the flushing inlet pipe (6); and a flushing regulating valve (19) and a flushing pressure transmitter (21) are installed between the flushing inlet program-controlled valve (14) and the flushing tank (5).

7. The pressure swing adsorption system with pressure equalization process adjustment according to claim 4, characterized in that: The regeneration mechanism is a vacuum regeneration mechanism.

8. A pressure swing adsorption system with pressure equalization process regulation according to claim 6 or 7, characterized in that: A raw gas program-controlled valve (10) is installed on the raw gas transmission pipe (1), a product gas program-controlled valve (11) is installed on the product gas external transmission pipe (3), a reverse pressure-reducing pipe (8) is installed with a reverse pressure-reducing program-controlled valve (16), and a boost regulating valve (18) is installed on the boost pipe (7); and a pressure transmitter (20) is installed on each adsorption tower (2).

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