Gas supercharging device, and device and method for separating hydrogen-oxygen mixed gas containing gas supercharging device

Abstract

The invention relates to a gas supercharging device, and a device and a method for separating hydrogen and oxygen mixed gas comprising the same. The gas supercharging device comprises a first compression device, a first cooling device, a second compression device and a second cooling device which are sequentially connected from high to low, a first water cooling device is arranged on the peripheral side of the first compression device; a second water cooling device is arranged on the peripheral side of the second compression device; by designing the connection relation of each water inlet and each water outlet in the gas supercharging device, the problems of high operation risk and unstable device operation caused by heat generated in the compression process of the hydrogen-oxygen mixed gas can be effectively solved, the hydrogen-oxygen mixed gas can be compressed to 0.4 MPa or above, and meanwhile, the temperature of the hydrogen-oxygen mixed gas is ensured to be lower than 50 DEG C; and the gas supercharging device is combined with the pressure swing adsorption device, the condensing device and the drying device, so that efficient separation of the hydrogen-oxygen mixed gas with relatively high hydrogen purity is realized, and the hydrogen recovery rate is up to 80% or above.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen separation and purification, and in particular to a gas pressurizing device, and a device and method for separating hydrogen-oxygen mixed gas comprising the same. Background Art

[0002] As an important component of the future energy system, hydrogen energy will be widely used in industries that are difficult to decarbonize, such as industry, transportation, and building heating, as well as other emerging industries. Advanced green hydrogen production technologies mainly include water electrolysis, solar photocatalytic water splitting, photosynthetic biohydrogen production, and nuclear energy hydrogen production. Among the many hydrogen production methods, solar photocatalytic water splitting is the most ideal hydrogen production method. This method does not consume fossil energy and does not produce by-products. It is a true green hydrogen preparation technology. However, as early as 1972, some scholars began to study hydrogen production by photocatalytic water splitting, but it has been limited to the laboratory stage. In addition to the low hydrogen production efficiency and unstable catalysts, the separation of hydrogen and oxygen mixed gases produced by solar photocatalytic water splitting is a difficult point.

[0003] At present, the main hydrogen purification technologies include gas membrane separation, cryogenic separation and pressure swing adsorption, all of which can achieve good separation effects. However, due to the explosiveness of hydrogen-oxygen mixed gases, hydrogen purification technologies are used to purify mixed gases of hydrogen and other gases except oxygen. For hydrogen-oxygen mixed gases, especially for hydrogen-oxygen mixed gases with a volume ratio of 2:1 produced by solar photolysis of water to produce hydrogen, there is currently no mature and economical hydrogen-oxygen separation process and separation device.

[0004] For example, the gas membrane separation method uses the selective permeability of a specific type of membrane to a specific component in the components to separate and purify the mixed gas. It requires a relatively high pressure (5-14MPa) to drive. The gas membrane separation technology is suitable for scenarios where the mixed gas is easily pressurized or already under pressure, such as the recovery of hydrogen from hydrogen-containing tail gas in oil refining and chemical processes. However, for the hydrogen-oxygen mixed gas with a volume ratio of 2:1 produced by solar hydrolysis, it is a slightly positive pressure and cannot reach the pressure required to drive membrane separation. It needs to be pressurized to a higher pressure to separate and purify hydrogen and oxygen. Excessive heat is easily generated during the pressurization process, causing the gas temperature to rise sharply, which is easy to cause an explosion. Not only is the risk factor high, but the energy consumption is also high.

[0005] The cryogenic separation method utilizes the relative volatility difference (boiling point difference) of the raw gas components under low temperature conditions to condense part of the gas, thereby achieving the purpose of separation. This method is suitable for working conditions with low hydrogen content in the raw gas (about 20%). However, for hydrogen-containing gas, its condensation temperature is not only related to the total pressure of the mixed gas, but also to the partial pressure of the component. When a certain component is partially condensed, the partial pressure of the component in the gas phase decreases, and its condensation temperature also decreases accordingly. Therefore, each component cannot be completely condensed when it reaches its condensation temperature. In actual operation, this method has high energy consumption and low hydrogen purity. At the same time, the hydrogen-oxygen mixed gas produced by solar photolysis of water to produce hydrogen contains a certain amount of water vapor. The temperature drop during the cryogenic separation process will cause the pipeline to freeze or even block, which will pose a greater hidden danger to the safety of the equipment.

[0006] Pressure swing adsorption is a method of utilizing different gases to have different selective adsorption capacities on adsorbents at different pressures, and adsorbing and desorbing them through periodic changes in pressure, thereby achieving gas separation and purification. This method has low requirements for the source of raw gas. Generally, raw gas with a hydrogen component of about 30% can be subjected to pressure swing adsorption operation, and the required operating pressure is relatively low (0.2-0.8 MPa). However, the pressure swing adsorption method currently reported mainly separates and purifies a mixture of hydrogen and other gases except oxygen, such as separating hydrogen from reforming gas in the process of petroleum refining, separating hydrogen from gas produced by electrolysis of brine in the chlor-alkali industry, or separating hydrogen from synthesis gas in the process of producing ammonia. Due to the characteristics that hydrogen and oxygen mixed gas is extremely prone to explosion at a certain ratio, and the pressure needs to be changed periodically during the pressure swing adsorption process to compress or decompress the gas, the temperature of the process rises, and the operation is very dangerous.

[0007] Therefore, in order to solve the problem of separating hydrogen-oxygen mixed gas with high hydrogen purity, especially the hydrogen-oxygen mixed gas produced by solar photolysis of water to produce hydrogen, it is a technical problem that needs to be solved urgently to develop a gas boosting device that can obtain high pressure and low temperature, and a device and method for separating hydrogen-oxygen mixed gas with high hydrogen recovery rate. Summary of the invention

[0008] In order to solve the above technical problems, the present invention provides a gas boosting device, a device and method for separating hydrogen-oxygen mixed gases comprising the same. The gas boosting device can solve the problem of high operating risks caused by the large amount of heat generated during the hydrogen gas boosting process, and can obtain low-temperature and high-pressure compressed gas; the device for separating hydrogen-oxygen mixed gases comprising the gas boosting device can achieve the separation of hydrogen-oxygen mixed gases with higher hydrogen purity, the device operates stably and safely, and has a high hydrogen recovery rate.

[0009] To achieve this object, the present invention adopts the following technical solutions:

[0010] In the first aspect, the present invention provides a gas boosting device, which includes a first compression device, a first cooling device, a second compression device and a second cooling device connected in sequence from high to low; a first water cooling device is arranged on the surrounding side of the first compression device; a second water cooling device is arranged on the surrounding side of the second compression device; the water outlet of the second cooling device is connected to the water inlet of the first cooling device; the water outlet of the first cooling device is connected to the water inlet of the first water cooling device; the water outlet of the first water cooling device is connected to the water inlet of the second water cooling device.

[0011] Wherein, the first compression device, the first cooling device, the second compression device and the second cooling device constitute the boosting component of the gas boosting device.

[0012] The gas boosting device of the present invention realizes the boosting process of compression, cooling, recompression and recooling by designing the first compression device, the first cooling device, the second compression device and the second cooling device connected in sequence from high to low; at the same time, the first water cooling device and the second water cooling device are designed to cool the compression chamber body of the compression device; and the connection relationship between the water inlet and outlet of the second cooling device, the first cooling device, the first water cooling device and the second water cooling device is designed to ensure that the cooling water flows through the second cooling device first, then flows through the first cooling device, then flows through the first water cooling device, and finally flows through the second water cooling device, ensuring that the cooling water enters from the bottom and exits from the top, realizing sufficient heat exchange, and timely discharging the heat generated in the process of compressing the hydrogen-oxygen mixed gas, thereby avoiding the risk of explosion of the hydrogen-oxygen mixed gas due to excessive temperature, obtaining a low-temperature, high-pressure hydrogen-oxygen mixed gas with high hydrogen purity, and meeting the operating pressure required for subsequent separation of the hydrogen-oxygen mixed gas by pressure swing adsorption separation method.

[0013] The present invention specifically designs the connection relationship between the water inlet and outlet of the second cooling device, the first cooling device, the first water cooling device and the second water cooling device, which can not only make the cooling water enter from the bottom and exit from the top, and efficiently cool the compression chamber of the compression device and the compressed hydrogen-oxygen mixed gas; but also make the overall structure of the gas boosting device compact and reduce the occupied space.

[0014] Preferably, the first compression device comprises a first cylinder.

[0015] Preferably, the second compression device comprises a second cylinder.

[0016] Preferably, the first cylinder and the second cylinder each independently include a piston, a crankshaft and a connecting rod.

[0017] Preferably, the gas boosting device is provided with a total gas inlet and a total gas outlet.

[0018] Preferably, the total gas inlet of the gas boosting device is connected to the air inlet of the first compression device; the air outlet of the first compression device is connected to the air inlet of the first cooling device; the air outlet of the first cooling device is connected to the air inlet of the second compression device; the air outlet of the second compression device is connected to the air inlet of the second cooling device; and the air outlet of the second cooling device is connected to the total gas outlet of the gas boosting device.

[0019] Preferably, a first pressure sensor and a first solenoid valve are provided on the pipeline between the total gas inlet of the gas boosting device and the gas inlet of the first compression device.

[0020] The present invention further preferably provides a first pressure sensor and a first solenoid valve on the pipeline between the total gas inlet of the gas boosting device and the air inlet of the first compression device. The first pressure sensor cooperates with the first solenoid valve. After the gas boosting device is started, the first solenoid valve opens. When the first pressure sensor shows that the intake pressure drops, the first solenoid valve controls the gas flow output to decrease. When the intake pressure further drops and reaches the set protection value, the gas boosting device is forced to shut down.

[0021] Preferably, a filter is provided on the pipeline between the total gas inlet of the gas boosting device and the gas inlet of the first compression device, preferably a Y-type filter.

[0022] The present invention further preferably provides a filter on the pipeline between the total gas inlet of the gas boosting device and the gas inlet of the first compression device, so as to remove solid impurities entrained in the hydrogen-oxygen mixed gas, so as to avoid entering the subsequent process and causing high operational risks in the compression process.

[0023] Preferably, a first temperature sensor is provided on the pipeline between the air outlet of the first compression device and the air inlet of the first cooling device.

[0024] The present invention further preferably provides a first temperature sensor on the pipeline between the air outlet of the first compression device and the air inlet of the first cooling device, and the first temperature sensor is used to monitor the temperature reached by the gas after being compressed by the first compression device. When the temperature is too high, the gas boosting device will automatically shut down.

[0025] Preferably, a second pressure sensor is provided on the pipeline between the air outlet of the first cooling device and the air inlet of the second compression device.

[0026] Preferably, a first safety valve and a first blasting component are also provided on the pipeline between the air outlet of the first cooling device and the air inlet of the second compression device.

[0027] The present invention further preferably has a second pressure sensor disposed on the pipeline between the air outlet of the first cooling device and the air inlet of the second compression device, for monitoring the pressure value of the gas compressed by the first compression device and then cooled by the first cooling device; preferably, a first safety valve and a first bursting component are also disposed on the pipeline between the air outlet of the first cooling device and the air inlet of the second compression device; when the pressure value exceeds the set value, the first safety valve automatically opens, and when the first safety valve fails, the first bursting component ruptures to protect the gas pressurizing device.

[0028] Preferably, a second temperature sensor is provided on the pipeline between the air outlet of the second compression device and the air inlet of the second cooling device.

[0029] The present invention further preferably provides a second temperature sensor on the pipeline between the air outlet of the second compression device and the air inlet of the second cooling device, and the second sensor is used to monitor the temperature of the gas compressed by the second compression device. When the temperature is too high, the gas boosting device will automatically shut down.

[0030] Preferably, a second solenoid valve and a third pressure sensor are provided on the pipeline between the gas outlet of the second cooling device and the gas main outlet of the gas boosting device.

[0031] The present invention further preferably provides a second solenoid valve and a third pressure sensor on the pipeline between the gas outlet of the second cooling device and the total gas outlet of the gas boosting device. The second solenoid valve and the third pressure sensor work together. When the second pressure sensor shows that the gas pressure reaches the rated pressure, the first solenoid valve is closed to stop the air intake, and the second solenoid valve is opened to release the high-pressure gas remaining in the cylinder to ensure that the gas positive pressure device is unloaded when restarted. When the second pressure sensor shows that the gas pressure drops to the set lower limit value, the gas boosting device starts automatically, the first solenoid valve opens, and the second solenoid valve closes to continue compressing the gas.

[0032] Preferably, a second safety valve and a second explosion component are further provided on the pipeline between the gas outlet of the second cooling device and the gas main outlet of the gas boosting device.

[0033] The present invention further preferably includes a second safety valve and a second explosion component on the pipeline between the gas outlet of the second cooling device and the total gas outlet of the gas boosting device. When the gas outlet pressure exceeds a set value, the second safety valve automatically opens. When the second safety valve fails, the second explosion component ruptures to protect the gas boosting device.

[0034] Preferably, the gas boosting device is also provided with a chiller.

[0035] The present invention further preferably provides the gas boosting device with a water chiller for providing cooling water to the gas boosting device, so as to timely discharge the heat of the compression chamber of the cylinder and the gas compressed by the first compression device and the second compression device, so that the gas boosting device can operate stably.

[0036] Preferably, the water outlet of the chiller is connected to the water inlet of the second cooling device.

[0037] Preferably, a third temperature sensor is provided on the pipeline between the water outlet of the chiller and the second cooling device.

[0038] The present invention further preferably provides a third temperature sensor on the pipeline between the water outlet of the chiller and the second cooling device for monitoring the temperature of the cooling water provided by the first circulating water pump. If the temperature is too high, the gas boosting device will automatically shut down.

[0039] The present invention further preferably provides the chiller to continuously provide circulating cooling water to the gas booster device, that is, the cooling water with a higher temperature after heat exchange discharged from the water outlet of the second water cooling device is further cooled for subsequent cooling water supply.

[0040] Preferably, a fourth pressure sensor and a third safety valve are provided on the pipeline between the water outlet of the second water cooling device and the water inlet of the chiller.

[0041] The present invention further preferably provides a fourth pressure sensor and a fourth safety valve on the pipeline between the water outlet of the second water cooling device and the water inlet of the chiller, for monitoring the pressure of cooling water discharged from the water outlet of the second water cooling device. If the pressure exceeds a set value, the third safety valve is automatically opened to protect the gas boosting device.

[0042] Preferably, a fourth temperature sensor is provided on the pipe between the water outlet of the second water cooling device and the water inlet of the chiller.

[0043] The present invention further preferably provides a fourth temperature sensor on the pipe between the water outlet of the second water cooling device and the water inlet of the chiller, for monitoring the temperature of the cooling water after heat exchange discharged from the water outlet of the second water cooling device. If the temperature is too high, the gas boosting device automatically shuts down.

[0044] In a second aspect, the present invention provides a device for separating a hydrogen-oxygen mixed gas, the device for separating a hydrogen-oxygen mixed gas comprising a condensing device, the gas pressurizing device described in the first aspect, a drying device and a pressure swing adsorption device connected in sequence.

[0045] The device for separating hydrogen-oxygen mixed gases of the present invention can achieve efficient separation of hydrogen-oxygen mixed gases, especially hydrogen-oxygen mixed gases in which the volume proportion of oxygen is relatively high (5% to 33.4%), especially hydrogen-oxygen mixed gases produced by solar hydrolysis to produce hydrogen (the volume ratio of hydrogen to oxygen is 2:1), and the device for separating hydrogen-oxygen mixed gases has a compact structure, occupies a small area, can be stably operated, and has low operating risks.

[0046] Preferably, the pressure swing adsorption device comprises at least two adsorption towers arranged in parallel, for example, two, three, four or five.

[0047] The present invention further preferably comprises at least two adsorption towers arranged in parallel to improve the adsorption efficiency of oxygen in the hydrogen-oxygen mixed gas and achieve high-purity recovery of hydrogen in the hydrogen-oxygen mixed gas.

[0048] Preferably, an adsorbent is provided in the adsorption tower.

[0049] Preferably, the total gas outlet of the gas booster device is connected in parallel with the gas inlet of each adsorption tower.

[0050] Preferably, the device for separating hydrogen and oxygen mixed gas is further provided with a first buffer device between the drying device and the pressure swing adsorption device.

[0051] Preferably, the device for separating the hydrogen-oxygen mixed gas is further provided with a second buffer device, and the air inlet of the second buffer device is connected to the air outlet of each adsorption tower in the pressure swing adsorption device.

[0052] Preferably, the device for separating the hydrogen-oxygen mixed gas is further provided with a gas storage device between the condensing device and the gas pressurizing device.

[0053] In a third aspect, the present invention provides a method for separating a hydrogen-oxygen mixed gas, wherein the method is performed using the device for separating a hydrogen-oxygen mixed gas according to the second aspect.

[0054] Preferably, the method comprises the following steps:

[0055] (1) The hydrogen and oxygen mixed gas is sent to a condensation device for condensation to obtain non-condensable gas;

[0056] (2) the non-condensable gas in step (1) enters a gas booster device for boosting to obtain compressed gas;

[0057] (3) The compressed gas in step (2) enters a drying device for drying to obtain dry compressed gas;

[0058] (4) The dried compressed gas in step (3) enters a pressure swing adsorption device for oxygen adsorption treatment to obtain hydrogen.

[0059] The method for separating hydrogen-oxygen mixed gas of the present invention has good separation effect, high hydrogen recovery rate, simple operation, low energy consumption, economic feasibility and low risk.

[0060] Preferably, the volume ratio of hydrogen to oxygen in the hydrogen-oxygen mixed gas in step (1) is (1.8-20):1, for example, it can be 1.8:1, 2:1, 3:1, 5:1, 5.5:1, 8:1, 10:1, 12:1, 15:1, 18:1 or 20:1, etc., preferably (2-10):1.

[0061] The method of the present invention is directed to a wide range of volume ratios of hydrogen-oxygen mixed gas, and it is further preferred that the volume ratio of hydrogen to oxygen in the hydrogen-oxygen mixed gas is (1.8-20):1.

[0062] Preferably, the temperature of the condensation treatment in step (1) is 5 to 25°C, for example, 5°C, 10°C, 15°C, 20°C or 25°C.

[0063] Preferably, the pressurization treatment in step (2) includes: the non-condensable gas is first compressed by a first compression device to obtain a first pressurized gas, the first pressurized gas is first cooled by a first cooling device to obtain a first pressurized cooled gas, and then the first pressurized cooled gas is first compressed by a second compression device to obtain a second pressurized gas, and then cooled by a second cooling device to obtain a second pressurized cooled gas.

[0064] Preferably, during the pressurization process in step (2), the rotation speed of the piston in the first compression device is 80 to 180 r / min, for example, it can be 80 r / min, 100 r / min, 120 r / min, 140 r / min, 160 r / min or 180 r / min.

[0065] Preferably, during the pressurization treatment in step (2), the temperatures of the first cooling and the second cooling are independently 3 to 10°C, for example, 3°C, 5°C, 8°C or 10°C.

[0066] The temperatures of the first cooling and the second cooling of the present invention refer to the temperature of the cooling water in the first cooling device and the temperature of the cooling water in the second cooling device, respectively.

[0067] The drying device of the present invention preferably adopts an adsorption dryer, and there is no special restriction on the drying temperature of the drying process. The purpose is to reduce the water vapor content in the second boosted cooling gas to ensure the high activity of the oxygen adsorbent in the subsequent adsorption tower.

[0068] Preferably, the oxygen adsorbent used in the oxygen adsorption treatment in step (4) includes any one of porous carbon molecular sieves, zeolite molecular sieves or calcium-based molecular sieves, or a combination of at least two of them, wherein typical but non-limiting combinations include a combination of porous carbon molecular sieves and zeolite molecular sieves, a combination of zeolite molecular sieves and calcium-based molecular sieves, or a combination of porous carbon molecular sieves and calcium-based molecular sieves, etc.

[0069] Preferably, the ratio of the amount of the oxygen adsorbent to the volume of oxygen in the hydrogen-oxygen mixed gas is 3 to 5 kg / Nm 3 , for example, it can be 3kg / Nm 3 、3.5kg / Nm 3 , 4kg / Nm 3 , 4.5kg / Nm 3 or 5kg / Nm 3 wait.

[0070] As a further preferred technical solution of the present invention, the method comprises the following steps:

[0071] (1) sending a hydrogen-oxygen mixed gas having a volume ratio of hydrogen to oxygen of (1.8-20):1 into a condensing device for condensation at 5-25° C. to obtain non-condensable gas;

[0072] (2) the non-condensable gas in step (1) enters a gas booster device for boosting to obtain compressed gas;

[0073] The pressurization process includes: the non-condensable gas is first compressed by a first compression device to obtain a first pressurized gas, the first pressurized gas is first cooled by a first cooling device to obtain a first pressurized cooled gas, and then the first pressurized cooled gas is first compressed by a second compression device to obtain a second pressurized gas, and then cooled by a second cooling device to obtain a second pressurized cooled gas;

[0074] The speed of the piston in the first compression device is 80-180 r / min; the temperature of the first cooling and the second cooling are independently 3-10° C.;

[0075] (3) The compressed gas in step (2) enters a drying device for drying to obtain dry compressed gas;

[0076] (4) The dried compressed gas in step (3) enters a pressure swing adsorption device and is subjected to oxygen adsorption treatment using an oxygen adsorbent to obtain hydrogen;

[0077] The ratio of the amount of the oxygen adsorbent to the volume of oxygen in the hydrogen-oxygen mixed gas is 3-5 kg / Nm 3 .

[0078] Compared with the prior art, the present invention has at least the following beneficial effects:

[0079] (1) The gas boosting device provided by the present invention realizes simultaneous compression and cooling during the gas compression process by providing a cooling device and a water cooling device, so that the compressed gas has the characteristics of low temperature and high pressure (temperature as low as below 50°C and pressure as high as above 0.4MPa), and the connection relationship between the water inlet and outlet is designed to ensure that cooling water can enter from the bottom and exit from the top, so that heat exchange is more sufficient, thereby solving the problem of high operating risks caused by excessive heat during the compression process of gas (especially hydrogen-oxygen mixed gas with a relatively large volume of hydrogen), and the gas boosting device has a compact overall structure and occupies a small area.

[0080] (2) The device for separating hydrogen and oxygen mixed gases provided by the present invention realizes efficient separation of hydrogen and oxygen mixed gases by pressure swing adsorption at a relatively low operating pressure by providing a condensing device, the gas pressurizing device and the pressure swing adsorption device. The hydrogen recovery rate is as high as over 80%. In addition, the device for separating hydrogen and oxygen mixed gases has a simple and compact structure and a safe and stable operating state.

[0081] (3) The method for separating hydrogen-oxygen mixed gases provided by the present invention realizes the efficient separation of hydrogen-oxygen mixed gases, especially hydrogen-oxygen mixed gases in which oxygen accounts for a relatively large proportion by volume, and solves the problem that when separating hydrogen-oxygen mixed gases by membrane separation method and deep-cold separation method, the hydrogen-oxygen mixed gas is pressurized from normal pressure to medium-high pressure in the front-end hydrogen-oxygen mixed gas pressurization process, resulting in extremely dangerous operation and poor hydrogen-oxygen separation effect under low-pressure conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] Figure 1 1 is a schematic diagram of the structure and connection relationship of the device for separating hydrogen and oxygen mixed gas provided in Example 1 of the present invention;

[0083] Figure 2 Schematic diagram of the structure and connection relationship of the gas pressurizing device provided in Example 1 of the present invention;

[0084] Figure 3 It is a schematic diagram of the structure and connection relationship of the pressure swing adsorption device, the first buffer tank and the second buffer tank in the device for separating hydrogen and oxygen mixed gas provided in Example 1 of the present invention;

[0085] In the figure: 1. condenser; 2. gas storage tank; 3. gas booster; 31. booster; 311. first cylinder; 312. first cooler; 313. second cylinder; 314. second cooler; 315. first water-cooling jacket; 316. second water-cooling jacket; 317. first solenoid valve; 318. second solenoid valve; 32. chiller; 4. dryer; 5. pressure swing adsorption device; 501. adsorption tower; 6. first buffer tank; 7. second buffer tank. DETAILED DESCRIPTION

[0086] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and through specific implementation methods. However, the following examples are only simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the claims.

[0087] 1. Implementation

[0088] Example 1

[0089] This embodiment provides a gas pressurizing device 3, such as Figure 2 As shown, the gas boosting device 3 includes a booster 31 and a chiller 32; the booster 31 includes a first cylinder 311, a first cooler 312, a second cylinder 313 and a second cooler 314 connected in sequence from high to low; a first water-cooling jacket 315 is provided on the circumference of the first cylinder 311; a second water-cooling jacket 316 is provided on the circumference of the second cylinder 313;

[0090] The water outlet of the chiller 32 is connected to the water inlet of the second cooler 314; the water outlet of the second cooler 314 is connected to the water inlet of the first cooler 312; the water outlet of the first cooler 312 is connected to the water inlet of the first water-cooling jacket 315; the water outlet of the first water-cooling jacket 315 is connected to the water inlet of the second water-cooling jacket 316; the water outlet of the second water-cooling jacket 316 is connected to the water inlet of the chiller 32;

[0091] The gas booster 3 is provided with a total gas inlet and a total gas outlet; the total gas inlet of the gas booster 3 is connected to the air inlet of the first cylinder 311; the air outlet of the first cylinder 311 is connected to the air inlet of the first cooler 312; the air outlet of the first cooler 312 is connected to the air inlet of the second cylinder 313; the air outlet of the second cylinder 313 is connected to the air inlet of the second cooler 314; the air outlet of the second cooler 314 is connected to the total gas outlet of the gas booster 3; along the gas inlet direction, a Y-type filter, a first pressure sensor and a first electric filter connected in sequence are provided on the pipeline between the total gas inlet of the gas booster 3 and the air inlet of the first cylinder 311 A magnetic valve 317; a first temperature sensor is provided on the pipeline between the gas outlet of the first cylinder 311 and the gas inlet of the first cooler 312; along the gas inlet direction, a first bursting disc, a second pressure sensor and a first safety valve connected in sequence are provided on the pipeline between the gas outlet of the first cooler 312 and the gas inlet of the second cylinder 313; a second temperature sensor is provided on the pipeline between the gas outlet of the second cylinder 313 and the gas inlet of the second cooler 314; along the gas inlet direction, a second electromagnetic valve 318, a second bursting disc, a third pressure sensor and a second safety valve connected in sequence are provided on the pipeline between the gas outlet of the second cooler 314 and the gas main outlet of the gas booster device 3;

[0092] A third temperature sensor is arranged on the pipeline between the water outlet of the chiller 32 and the second cooler 314; along the flow direction of cooling water, a third safety valve, a fourth pressure sensor and a fourth temperature sensor are arranged on the pipeline between the water outlet of the second water-cooling sleeve 316 and the water inlet of the chiller 32.

[0093] This embodiment also provides a device for separating hydrogen and oxygen mixed gas, such as Figure 1 As shown, the device for separating the hydrogen-oxygen mixed gas comprises a condenser 1, a gas storage tank 2, a gas booster 3 provided in this embodiment, a dryer 4, a first buffer tank 6, a pressure swing adsorption device 5 and a second buffer tank 7 connected in sequence;

[0094] like Figure 3 As shown, the pressure swing adsorption device 5 includes two adsorption towers 501 arranged in parallel; an adsorbent (the adsorbent is a carbon molecular sieve) is arranged in the adsorption tower 501; the total gas outlet of the gas booster device 3 is connected to the air inlet of the first buffer tank 6, and the air outlet of the first buffer tank 6 is connected in parallel with the air inlet of each adsorption tower 501; the air inlet of the second buffer tank 7 is connected to the air outlet of each adsorption tower 501 in the pressure swing adsorption device 5.

[0095] Example 2

[0096] This embodiment provides a gas boosting device, which includes a booster and a chiller; the booster includes a first cylinder, a first cooler, a second cylinder, and a second cooler connected in sequence from high to low; a first water-cooling jacket is provided on the circumference of the first cylinder; a second water-cooling jacket is provided on the circumference of the second cylinder;

[0097] The water outlet of the chiller is connected to the water inlet of the second cooler; the water outlet of the second cooler is connected to the water inlet of the first cooler; the water outlet of the first cooler is connected to the water inlet of the first water-cooling jacket; the water outlet of the first water-cooling jacket is connected to the water inlet of the second water-cooling jacket; the water outlet of the second water-cooling jacket is connected to the water inlet of the chiller; the gas booster device is provided with a total gas inlet and a total gas outlet; the total gas inlet of the gas booster device is connected to the air inlet of the first cylinder; the air outlet of the first cylinder is connected to the air inlet of the first cooler; the air outlet of the first cooler is connected to the air inlet of the second cylinder; the air outlet of the second cylinder is connected to the air inlet of the second cooler; the air outlet of the second cooler is connected to the total gas outlet of the gas booster device; Along the gas inlet direction, a first pressure sensor and a first solenoid valve connected in sequence are arranged on the pipeline between the total gas inlet of the gas boosting device and the air inlet of the first cylinder; a first temperature sensor is arranged on the pipeline between the air outlet of the first cylinder and the air inlet of the first cooler; along the gas inlet direction, a first bursting disc, a second pressure sensor and a first safety valve connected in sequence are arranged on the pipeline between the air outlet of the first cooler and the air inlet of the second cylinder; a second temperature sensor is arranged on the pipeline between the air outlet of the second cylinder and the air inlet of the second cooler; along the gas inlet direction, a second solenoid valve, a second bursting disc, a third pressure sensor and a second safety valve connected in sequence are arranged on the pipeline between the air outlet of the second cooler and the total gas outlet of the gas boosting device;

[0098] A third temperature sensor is arranged on the pipeline between the water outlet of the chiller and the second cooler; along the flow direction of cooling water, a third safety valve and a fourth pressure sensor are arranged on the pipeline between the water outlet of the second water-cooling sleeve and the water inlet of the chiller.

[0099] This embodiment also provides a device for separating hydrogen and oxygen mixed gas, the device for separating hydrogen and oxygen mixed gas comprises a condenser, a gas storage tank, a gas pressurizing device provided in this embodiment, a dryer, a pressure swing adsorption device and a second buffer tank connected in sequence;

[0100] The pressure swing adsorption device includes three adsorption towers arranged in parallel; an adsorbent (the absorbent is a carbon molecular sieve) is arranged in the adsorption tower; the total gas outlet of the gas booster device is connected to the air inlet of the first buffer tank, and the air outlet of the first buffer tank is connected in parallel to the air inlet of each adsorption tower; the air inlet of the second buffer tank is connected to the air outlet of each adsorption tower in the pressure swing adsorption device.

[0101] Example 3

[0102] This embodiment provides a gas boosting device, which is the same as the first embodiment except that the Y-type filter is not provided.

[0103] This embodiment further provides a device for separating a hydrogen-oxygen mixed gas. The device for separating a hydrogen-oxygen mixed gas is the same as that of Embodiment 1 except that it uses the gas pressurizing device provided in this embodiment.

[0104] Since no Y-type filter is provided in Example 3, compared with Example 1, the gas boosting device in Example 3 cannot remove sodium hydroxide and solid impurity particles in the gas, and is prone to wear or blockage of the gas boosting device, thereby reducing the boosting efficiency and service life, thereby affecting the working efficiency of the device for separating the hydrogen and oxygen mixed gas.

[0105] Example 4

[0106] This embodiment provides a gas pressurizing device, which is the same as the first embodiment except that the second bursting disc is not provided.

[0107] This embodiment further provides a device for separating a hydrogen-oxygen mixed gas. The device for separating a hydrogen-oxygen mixed gas is the same as that of Embodiment 1 except that it uses the gas pressurizing device provided in this embodiment.

[0108] Since the second bursting disc is not provided in Example 4, when the pressure of the gas after being compressed by the first cylinder is too high and the first safety valve fails, the pressure in the gas boosting device is too high, which makes the operation dangerous and the automatic protection of the gas boosting device cannot be exploded, that is, the operation of the device is extremely unstable.

[0109] Example 5

[0110] This embodiment provides a device for separating a hydrogen-oxygen mixed gas. The device for separating a hydrogen-oxygen mixed gas is the same as that of Embodiment 1 except that the pressure swing adsorption device is only provided with one adsorption tower.

[0111] Since the pressure swing adsorption device described in Example 5 is provided with only one adsorption tower, after the oxygen adsorbent in the adsorption tower is saturated with adsorption, it cannot continue to adsorb oxygen, resulting in a decrease in the separation efficiency of the hydrogen-oxygen mixed gas.

[0112] Example 6

[0113] This embodiment provides a device for separating a hydrogen-oxygen mixed gas. The device for separating a hydrogen-oxygen mixed gas is the same as that of Embodiment 1 except that a condenser is not provided.

[0114] Since the device for separating the hydrogen-oxygen mixed gas described in Example 6 is not provided with a condenser, too much water vapor remains in the hydrogen-oxygen mixed gas, thereby increasing the workload of the dryer, accelerating the deactivation of the oxygen adsorbent in the subsequent adsorption tower, and the gas boosting device cannot operate safely and stably.

[0115] Example 7

[0116] This embodiment provides a device for separating a hydrogen-oxygen mixed gas. The device for separating a hydrogen-oxygen mixed gas is the same as that of Embodiment 1 except that a dryer is not provided.

[0117] Since no dryer is provided in Example 7, after the hydrogen-oxygen mixed gas is compressed and cooled by the gas booster, the entrained water vapor is not removed in time, resulting in the deactivation of the oxygen adsorbent in the subsequent adsorption tower and unstable operation of the device; and the entrained water vapor will also reduce the purity of the hydrogen after separation.

[0118] 2. Comparison

[0119] Comparative Example 1

[0120] This comparative example provides a gas boosting device, which is the same as Example 1 except that the second cylinder and the second cooler are not provided.

[0121] This comparative example also provides a device for separating a hydrogen-oxygen mixed gas. The device for separating a hydrogen-oxygen mixed gas is the same as Example 1 except that it uses the gas pressurizing device provided in this comparative example.

[0122] Since the second cylinder and the second cooler are not provided in Comparative Example 1, that is, the gas boosting device can only perform one boosting and one cooling, the hydrogen-oxygen mixed gas can only be compressed to 0.1-0.4 MPa, and cannot be compressed to the operating pressure required for pressure swing adsorption (0.2-0.8 MPa); and the temperature after one cooling is only reduced to 70-90°C, which is still relatively high.

[0123] Comparative Example 2

[0124] This comparative example provides a gas boosting device, which is the same as Example 1 except that the first cooler and the second cooler are not provided.

[0125] This comparative example also provides a device for separating a hydrogen-oxygen mixed gas. The device for separating a hydrogen-oxygen mixed gas is the same as Example 1 except that it uses the gas pressurizing device provided in this comparative example.

[0126] Since the first cooler and the second cooler are not provided in Comparative Example 2, the heat generated during the compression of the hydrogen-oxygen mixed gas cannot be discharged in time. On the one hand, the temperature of the compression chamber is too high, and on the other hand, the temperature of the hydrogen-oxygen mixed gas is too high, both of which lead to great operational risks and cannot be operated safely and stably.

[0127] Comparative Example 3

[0128] This comparative example provides a gas boosting device, in which the water outlet of the first water-cooling jacket is connected to the water inlet of the first cooler, the water outlet of the first cooler is connected to the water inlet of the second water-cooling jacket, and the water outlet of the second water-cooling jacket is connected to the water inlet of the second cooler. Compared with Example 1, the connection relationship of the corresponding water inlets and outlets in Comparative Example 3 causes the cooling water to enter from top and exit from bottom, resulting in insufficient heat exchange and poor cooling effect.

[0129] 3. Application Examples

[0130] Application Example 1

[0131] This application example provides a method for separating a hydrogen-oxygen mixed gas. The method is performed using the device for separating a hydrogen-oxygen mixed gas provided in Example 1. The method comprises the following steps:

[0132] (1) sending a hydrogen-oxygen mixed gas having a volume ratio of hydrogen to oxygen of 2:1 into a condensing device for condensation at 15° C. to obtain non-condensable gas;

[0133] (2) the non-condensable gas in step (1) enters a gas booster device for boosting to obtain compressed gas;

[0134] The pressurization process includes: the non-condensable gas is first compressed by a first cylinder to obtain first pressurized gas, the first pressurized gas is first cooled by a first cooler to obtain first pressurized cooled gas, and then the first pressurized cooled gas is first compressed by a second cylinder to obtain second pressurized gas, and then cooled by a second cooler to obtain second pressurized cooled gas;

[0135] The rotation speed of the piston in the first cylinder is 120 r / min; the temperature of the first cooling and the second cooling is 5° C. independently;

[0136] (3) The compressed gas in step (2) enters a drying device and is dried at a drying temperature of 30° C. to obtain dry compressed gas;

[0137] (4) The dried compressed gas in step (3) enters a pressure swing adsorption device and is subjected to oxygen adsorption treatment using an oxygen adsorbent to obtain hydrogen;

[0138] The ratio of the amount of the oxygen adsorbent to the volume of oxygen in the hydrogen-oxygen mixed gas is 4 kg / Nm3 .

[0139] In this application example, the pressure of the first compressed gas reaches 0.3MPa, the temperature of the first compressed cooling gas reaches 80°C, the pressure of the second compressed gas reaches 0.5MPa, the temperature of the second compressed cooling gas reaches 50°C, the purity of the obtained hydrogen is as high as 92.5%, and the recovery rate of hydrogen is as high as 84%.

[0140] Application Example 2

[0141] This application example provides a method for separating a hydrogen-oxygen mixed gas. The method is performed using the device for separating a hydrogen-oxygen mixed gas provided in Example 2. The method comprises the following steps:

[0142] (1) sending a hydrogen-oxygen mixed gas having a volume ratio of 5:1 between hydrogen and oxygen into a condensing device for condensation at 5° C. to obtain non-condensable gas;

[0143] (2) the non-condensable gas in step (1) enters a gas booster device for boosting to obtain compressed gas;

[0144] The pressurization process includes: the non-condensable gas is first compressed by a first cylinder to obtain first pressurized gas, the first pressurized gas is first cooled by a first cooler to obtain first pressurized cooled gas, and then the first pressurized cooled gas is first compressed by a second cylinder to obtain second pressurized gas, and then cooled by a second cooler to obtain second pressurized cooled gas;

[0145] The speed of the piston in the first cylinder is 80 r / min; the temperature of the first cooling and the second cooling are each independently 3° C.;

[0146] (3) The compressed gas in step (2) enters a drying device and is dried at a drying temperature of 20° C. to obtain dry compressed gas;

[0147] (4) The dried compressed gas in step (3) enters a pressure swing adsorption device and is subjected to oxygen adsorption treatment using an oxygen adsorbent to obtain hydrogen;

[0148] The ratio of the amount of the oxygen adsorbent to the volume of oxygen in the hydrogen-oxygen mixed gas is 4 kg / Nm 3 .

[0149] In this application example, the pressure of the first boosted gas reaches 0.2MPa, the temperature of the first boosted cooling gas reaches 70°C, the pressure of the second boosted gas reaches 0.4MPa, the temperature of the second boosted cooling gas reaches 40°C, the purity of the obtained hydrogen is as high as 91.1%, and the recovery rate of hydrogen is as high as 82%.

[0150] Application Example 3

[0151] This application example provides a method for separating a hydrogen-oxygen mixed gas. The method is performed using the device for separating a hydrogen-oxygen mixed gas provided in Example 1. The method comprises the following steps:

[0152] (1) sending a hydrogen-oxygen mixed gas having a volume ratio of hydrogen to oxygen of 10:1 into a condensing device for condensation at 10° C. to obtain non-condensable gas;

[0153] (2) the non-condensable gas in step (1) enters a gas booster device for boosting to obtain compressed gas;

[0154] The pressurization process includes: the non-condensable gas is first compressed by a first cylinder to obtain first pressurized gas, the first pressurized gas is first cooled by a first cooler to obtain first pressurized cooled gas, and then the first pressurized cooled gas is first compressed by a second cylinder to obtain second pressurized gas, and then cooled by a second cooler to obtain second pressurized cooled gas;

[0155] The rotation speed of the piston in the first cylinder is 180 r / min; the temperature of the first cooling and the second cooling are each independently 10° C.;

[0156] (3) The compressed gas in step (2) enters a drying device and is dried at a drying temperature of 45° C. to obtain dry compressed gas;

[0157] (4) The dried compressed gas in step (3) enters a pressure swing adsorption device and is subjected to oxygen adsorption treatment using an oxygen adsorbent to obtain hydrogen;

[0158] The ratio of the amount of the oxygen adsorbent to the volume of oxygen in the hydrogen-oxygen mixed gas is 5 kg / Nm 3 .

[0159] In this application example, the pressure of the first boosted gas reaches 0.4MPa, the temperature of the first boosted cooling gas reaches 100°C, the pressure of the second boosted gas reaches 0.8MPa, the temperature of the second boosted cooling gas reaches 50°C, the purity of the obtained hydrogen is as high as 93.8%, and the recovery rate of hydrogen is as high as 85%.

[0160] It can be seen from the comprehensive application examples 1 to 3 that the gas pressurizing device and the device for separating hydrogen-oxygen mixed gas comprising the same provided by the present invention can realize the pressurization of hydrogen-oxygen mixed gas with a high oxygen volume content (the volume ratio of hydrogen to oxygen is as high as (2 to 10): 1) and the efficient separation of hydrogen and oxygen, and can obtain a hydrogen-oxygen mixed gas with a pressure of more than 0.4 MPa and a temperature of less than 50°C, and the hydrogen recovery rate is as high as more than 80%, which solves the technical difficulties currently faced in separating hydrogen-oxygen mixed gases.

[0161] The applicant declares that the above is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention shall fall within the protection scope and disclosure scope of the present invention.

Claims

1. A gas boosting device, characterized in that: The gas boosting device comprises a first compression device, a first cooling device, a second compression device and a second cooling device connected in sequence from high to low; A first water cooling device is provided on the periphery of the first compression device; a second water cooling device is provided on the periphery of the second compression device; The water outlet of the second cooling device is connected to the water inlet of the first cooling device; the water outlet of the first cooling device is connected to the water inlet of the first water cooling device; the water outlet of the first water cooling device is connected to the water inlet of the second water cooling device.

2. The gas boosting device according to claim 1, characterized in that: The gas booster device is provided with a total gas inlet and a total gas outlet; Preferably, the total gas inlet of the gas boosting device is connected to the air inlet of the first compression device; the air outlet of the first compression device is connected to the air inlet of the first cooling device; the air outlet of the first cooling device is connected to the air inlet of the second compression device; the air outlet of the second compression device is connected to the air inlet of the second cooling device; the air outlet of the second cooling device is connected to the total gas outlet of the gas boosting device; Preferably, a first pressure sensor and a first solenoid valve are provided on the pipeline between the total gas inlet of the gas boosting device and the gas inlet of the first compression device; Preferably, a first temperature sensor is provided on the pipeline between the air outlet of the first compression device and the air inlet of the first cooling device; Preferably, a second pressure sensor is provided on the pipeline between the air outlet of the first cooling device and the air inlet of the second compression device; Preferably, a first safety valve and a first blasting component are also provided on the pipeline between the air outlet of the first cooling device and the air inlet of the second compression device; Preferably, a second temperature sensor is provided on the pipeline between the air outlet of the second compression device and the air inlet of the second cooling device; Preferably, a second solenoid valve and a third pressure sensor are provided on the pipeline between the gas outlet of the second cooling device and the gas main outlet of the gas boosting device; Preferably, a second safety valve and a second explosion component are further provided on the pipeline between the gas outlet of the second cooling device and the gas main outlet of the gas boosting device.

3. The gas boosting device according to claim 1 or 2, characterized in that: The gas boosting device is also provided with a water chiller; Preferably, the water outlet of the chiller is connected to the water inlet of the second cooling device; Preferably, a third temperature sensor is provided on the pipeline between the water outlet of the chiller and the second cooling device; Preferably, the water outlet of the second water cooling device is connected to the water inlet of the chiller; Preferably, a fourth pressure sensor and a third safety valve are provided on the pipeline between the water outlet of the second water cooling device and the water inlet of the chiller; Preferably, a fourth temperature sensor is provided on the pipe between the water outlet of the second water cooling device and the water inlet of the chiller.

4. A device for separating hydrogen and oxygen mixed gas, characterized in that: The device for separating hydrogen and oxygen mixed gas comprises a condensing device, a gas pressurizing device according to any one of claims 1 to 3, a drying device and a pressure swing adsorption device which are connected in sequence.

5. The device for separating hydrogen and oxygen mixed gas according to claim 4, characterized in that: The pressure swing adsorption device comprises at least two adsorption towers arranged in parallel; Preferably, an adsorbent is provided in the adsorption tower; Preferably, the total gas outlet of the gas booster device is connected in parallel with the gas inlet of each adsorption tower.

6. A method for separating a hydrogen-oxygen mixed gas, characterized in that: The method is carried out using the device for separating hydrogen and oxygen mixed gas as described in claim 4 or 5.

7. The method for separating hydrogen and oxygen mixed gas according to claim 6, characterized in that: The method comprises the following steps: (1) The hydrogen and oxygen mixed gas is sent to a condensation device for condensation to obtain non-condensable gas; (2) the non-condensable gas in step (1) enters a gas booster device for boosting to obtain compressed gas; (3) The compressed gas in step (2) enters a drying device for drying to obtain dry compressed gas; (4) The dried compressed gas in step (3) enters a pressure swing adsorption device for oxygen adsorption treatment to obtain hydrogen.

8. The method for separating hydrogen and oxygen mixed gas according to claim 6 or 7, characterized in that: The volume ratio of hydrogen to oxygen in the hydrogen-oxygen mixed gas in step (1) is (1.8-20):1, preferably (2-10):1; Preferably, the temperature of the condensation treatment in step (1) is 5 to 25°C; Preferably, the pressurization treatment in step (2) includes: the non-condensable gas is firstly compressed by a first compression device to obtain a first pressurized gas, the first pressurized gas is firstly cooled by a first cooling device to obtain a first pressurized cooled gas, and then the first pressurized cooled gas is firstly compressed by a second compression device to obtain a second pressurized gas, and then secondly cooled by a second cooling device to obtain a second pressurized cooled gas; Preferably, during the pressurization process in step (2), the rotation speed of the piston in the first compression device is 80-180 r / min; Preferably, during the pressurization treatment in step (2), the temperatures of the first cooling and the second cooling are independently 3 to 10°C.

9. The method for separating hydrogen and oxygen mixed gas according to any one of claims 6 to 8, characterized in that: The oxygen adsorbent used in the oxygen adsorption treatment in step (4) includes any one of porous carbon molecular sieves, zeolite molecular sieves or calcium-based molecular sieves, or a combination of at least two thereof; Preferably, the ratio of the amount of the oxygen adsorbent to the volume of oxygen in the hydrogen-oxygen mixed gas is 3 to 5 kg / Nm 3 .

10. The method for separating hydrogen and oxygen mixed gas according to claims 6 to 9, characterized in that: The method comprises the following steps: (1) sending a hydrogen-oxygen mixed gas having a volume ratio of hydrogen to oxygen of (1.8-20):1 into a condensing device for condensation at 5-25° C. to obtain non-condensable gas; (2) the non-condensable gas in step (1) enters a gas booster device for boosting to obtain compressed gas; The pressurization process includes: the non-condensable gas is first compressed by a first compression device to obtain a first pressurized gas, the first pressurized gas is first cooled by a first cooling device to obtain a first pressurized cooled gas, and then the first pressurized cooled gas is first compressed by a second compression device to obtain a second pressurized gas, and then cooled by a second cooling device to obtain a second pressurized cooled gas; The speed of the piston in the first compression device is 80-180 r / min; the temperature of the first cooling and the second cooling are independently 3-10° C.; (3) The compressed gas in step (2) enters a drying device for drying to obtain dry compressed gas; (4) The dried compressed gas in step (3) enters a pressure swing adsorption device and is subjected to oxygen adsorption treatment using an oxygen adsorbent to obtain hydrogen; The ratio of the amount of the oxygen adsorbent to the volume of oxygen in the hydrogen-oxygen mixed gas is 3-5 kg / Nm 3 .

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