System for treating hydrogen-rich gas by using rotary valve

Abstract

The utility model relates to a system for treating hydrogen-rich gas by using a rotary valve in the technical field of hydrogen-rich gas treatment, which comprises a compressor boosting system, a TSA system and a PSA system with the rotary valve which are connected in sequence, and a pre-cooling system is arranged between the compressor boosting system and the TSA system; the pre-cooling system comprises a first heat exchange device arranged between a compressor boosting system and a TSA system and used for cooling hydrogen-rich gas provided by the compressor boosting system; the separation tower is arranged between the first heat exchange equipment and the TSA system and is used for removing light hydrocarbon in the hydrogen-rich gas; according to the utility model, the temperature of the hydrogen-rich gas can be reduced through the first heat exchange equipment, so that light hydrocarbon in the hydrogen-rich gas is liquefied and discharged, the cleanliness of the hydrogen-rich gas entering the PSA system is purified, the loss of the light hydrocarbon in the hydrogen-rich gas per unit volume to an adsorbent in the rotary valve is effectively reduced, and the service life of the rotary valve is prolonged. And therefore, the hydrogen-rich gas treatment capacity of the rotary valve in unit time can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen-rich gas processing, in particular to a hydrogen-rich gas processing system utilizing a rotary valve. Background Art

[0002] For the recovery of hydrogen in hydrogen-rich gas (hydrogen purity 50%-60% (volume fraction)), the usual method is to organically combine PSA gas purification technology, membrane separation technology, cryogenic separation technology, and chemical absorption technology to adapt to different gas source conditions and product requirements. In the PSA gas purification process, conventional butterfly valves or flat plate valves are commonly used. Some also use rotary valves with small footprint and high control accuracy (integrating traditional program-controlled valves). However, since the amount of adsorbent in the rotary valve is about the same as that in the traditional butterfly valve or flat plate valve (adsorbing C2 + Light hydrocarbons) is 1 / 10, so the rotary valve can only be used to handle less than 5000Nm 3 / h or less hydrogen-rich gas.

[0003] To this end, we provide a method to reduce C2 + The light hydrocarbon content is used to increase the hydrogen content, thereby achieving a hydrogen-rich gas system that improves the rotary valve's processing capacity. Utility Model Content

[0004] In order to overcome the deficiencies in the background technology, the utility model discloses a system for processing hydrogen-rich gas using a rotary valve.

[0005] In order to achieve the above-mentioned purpose of the invention, the present invention adopts the following technical solutions:

[0006] A hydrogen-rich gas processing system using a rotary valve comprises a compressor boosting system, a TSA system, and a PSA system with a rotary valve connected in sequence, wherein a precooling system is provided between the compressor boosting system and the TSA system;

[0007] The precooling system comprises:

[0008] The first heat exchange device is provided between the compressor boosting system and the TSA system and is used to cool the hydrogen-rich gas provided by the compressor boosting system;

[0009] A separation tower, located between the first heat exchange device and the TSA system, is used to remove light hydrocarbons from the hydrogen-rich gas;

[0010] The second heat exchange equipment is installed between the separation tower and the TSA system and is used to heat the hydrogen-rich gas discharged from the separation tower.

[0011] Preferably, the second heat exchange device is also correspondingly provided between the compressor boosting system and the first heat exchange device, so as to reduce the temperature of the hydrogen-rich gas entering the first heat exchange device.

[0012] Preferably, two PSA systems are provided in parallel.

[0013] Preferably, the first heat exchange equipment is a gas-liquid heat exchange equipment.

[0014] Preferably, the second heat exchange equipment is an air-to-air heat exchange equipment or an air-to-liquid heat exchange equipment.

[0015] Preferably, the second heat exchange equipment is an air-to-air heat exchange equipment.

[0016] Due to the adoption of the above-mentioned technical solution, the utility model has the following beneficial effects:

[0017] 1. The first heat exchange device can reduce the temperature of the hydrogen-rich gas, so that the light hydrocarbons in the hydrogen-rich gas are liquefied and discharged, thereby purifying the cleanliness of the hydrogen-rich gas entering the PSA system and effectively reducing the loss of adsorbent in the rotary valve caused by light hydrocarbons in the hydrogen-rich gas per unit volume, thereby effectively increasing the hydrogen-rich gas processing capacity of the rotary valve per unit time;

[0018] 2. The setting of the second heat exchanger can not only heat the hydrogen-rich gas discharged from the separation tower to about 10°C to meet subsequent needs, but also preliminarily cool the hydrogen-rich gas provided by the compressor boost system, thereby saving the consumption of chilled water and eliminating the need for an external heating system to reheat the hydrogen-rich gas discharged from the separation tower, achieving energy-saving effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of a PSA gas purification system in the prior art;

[0020] Figure 2 This is a diagram of the PSA gas purification system of the present utility model;

[0021] Figure 3 This is a schematic diagram of the first structure of the pre-cooling system in the present invention;

[0022] Figure 4 This is a schematic diagram of the second structure of the pre-cooling system in the present invention.

[0023] In the figure: 1. Compressor boosting system; 2. TSA system; 3. PSA system; 4. Precooling system; 41. First heat exchange equipment; 42. Separation tower; 43. Second heat exchange equipment. DETAILED DESCRIPTION

[0024] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", "right" and so on to indicate directions or positional relationships, they only correspond to the drawings of the present application and are for the convenience of describing the present invention; it should be understood that if there are terms such as "end", "side", "end part", "lateral", "transverse", "longitudinal" and so on to indicate directions or positional relationships, they only correspond to the length and width of the corresponding parts, that is, "end part" indicates the head and tail area of the corresponding part in the length direction, and "side part" indicates the head and tail area of the corresponding part in the width direction; this is for the convenience of describing the present invention and does not indicate or imply that the device or element referred to must have a specific direction.

[0025] Example 1, combined with the attached Figure 2-3 A hydrogen-rich gas processing system using a rotary valve comprises a compressor boosting system 1, a TSA system 2, and a PSA system 3 with a rotary valve connected in sequence, and a precooling system 4 is provided between the compressor boosting system 1 and the TSA system 2;

[0026] The precooling system 4 includes:

[0027] The first heat exchange device 41 is provided between the compressor boosting system 1 and the TSA system 2 and is used to cool the hydrogen-rich gas provided by the compressor boosting system 1;

[0028] Furthermore, the first heat exchange device 41 is a gas-liquid heat exchange device; as needed, the first heat exchange device 41 uses the chilled water provided by the external chilled water system as a medium to cool the hydrogen-rich gas provided by the compressor boosting system 1;

[0029] As needed, the temperature of the chilled water provided by the external chilled water system is 6.5~7.5℃.

[0030] The separation tower 42 is provided between the first heat exchange device 41 and the TSA system 2 and is used to remove light hydrocarbons in the hydrogen-rich gas. Specifically, a hydrogen-rich gas outlet is provided at the top of the separation tower 42 and a light hydrocarbon outlet is provided at the bottom, that is, the cooled hydrogen-rich gas is separated into gas and liquid in the separation tower 42.

[0031] The second heat exchanger 43 is provided between the separation tower 42 and the TSA system 2 and is used to heat the hydrogen-rich gas discharged from the separation tower 42. That is, the hydrogen-rich gas discharged from the separation tower 42 is heated to about 10°C by the second heat exchanger 43 to meet subsequent needs.

[0032] Furthermore, the second heat exchanger 43 is an air-to-air heat exchanger or an air-to-liquid heat exchanger. As needed, the second heat exchanger 43 uses an external heating system to raise the temperature of the hydrogen-rich gas discharged from the separation tower 42 to approximately 10°C to meet subsequent requirements. Specifically, when the external heating system is a low-pressure steam system, the second heat exchanger 43 is an air-to-air heat exchanger; when the external heating system is a heat medium water system, the second heat exchanger 43 is an air-to-liquid heat exchanger.

[0033] As needed, in order to improve the processing efficiency, two PSA systems 3 are provided in parallel.

[0034] With this arrangement, the temperature of the hydrogen-rich gas can be lowered through the first heat exchange device 41, so that the light hydrocarbons in the hydrogen-rich gas are liquefied and discharged, thereby purifying the cleanliness of the hydrogen-rich gas entering the PSA system 3, effectively reducing the loss of the adsorbent in the rotary valve by the light hydrocarbons in the hydrogen-rich gas per unit volume, and thus effectively increasing the hydrogen-rich gas processing capacity of the rotary valve per unit time.

[0035] Example 2, combined with the attached Figure 4 , a hydrogen-rich gas processing system using a rotary valve, based on the first embodiment, a second heat exchange device 43 is further provided between the compressor boosting system 1 and the first heat exchange device 41, so as to reduce the temperature of the hydrogen-rich gas entering the first heat exchange device 41; that is, the second heat exchange device 43 can not only heat the hydrogen-rich gas discharged from the separation tower 42 to about 10°C to meet subsequent demand, but also preliminarily cool the hydrogen-rich gas provided by the compressor boosting system 1, thereby saving the consumption of chilled water and eliminating the need for an external heating system to reheat the hydrogen-rich gas discharged from the separation tower 42, thereby achieving an energy-saving effect.

[0036] In this embodiment, the second heat exchange device 43 is an air-to-air heat exchange device.

[0037] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and it is intended that all changes that fall within the meaning and scope of equivalent elements are included in the present invention.

Claims

1. A system for treating hydrogen-rich gas using a rotary valve, comprising a compressor boosting system (1), a TSA system (2), and a PSA system (3) having a rotary valve connected in sequence, characterized in that: A pre-cooling system (4) is provided between the compressor boosting system (1) and the TSA system (2); The pre-cooling system (4) comprises: A first heat exchange device (41) is provided between the compressor boosting system (1) and the TSA system (2) and is used to cool the hydrogen-rich gas provided by the compressor boosting system (1); A separation tower (42), provided between the first heat exchange device (41) and the TSA system (2), for removing light hydrocarbons from the hydrogen-rich gas; The second heat exchange device (43) is provided between the separation tower (42) and the TSA system (2) and is used to heat the hydrogen-rich gas discharged from the separation tower (42).

2. A system for processing hydrogen-rich gas using a rotary valve according to claim 1, characterized in that: The second heat exchange device (43) is also correspondingly provided between the compressor boosting system (1) and the first heat exchange device (41) so as to reduce the temperature of the hydrogen-rich gas entering the first heat exchange device (41).

3. The system for processing hydrogen-rich gas using a rotary valve according to claim 1, characterized in that: The PSA systems (3) are provided in two in parallel.

4. The system for processing hydrogen-rich gas using a rotary valve according to claim 1, characterized in that: The first heat exchange device (41) is a gas-liquid heat exchange device.

5. The system for processing hydrogen-rich gas using a rotary valve according to claim 1, characterized in that: The second heat exchange device (43) is a gas-to-gas heat exchange device or a gas-to-liquid heat exchange device.

6. The system for processing hydrogen-rich gas using a rotary valve according to claim 2, characterized in that: The second heat exchange device (43) is an air-to-air heat exchange device.

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