Hydrogen purification and regeneration waste heat utilization system

Abstract

The utility model relates to a hydrogen purification regeneration waste heat utilization system which comprises an adsorption tower, an electric heater, a heat exchanger and a cooling assembly, the adsorption tower is communicated with a raw material gas main pipe, a hydrogen storage pipe, a regeneration gas pipe, a first regeneration gas output pipe, a first heat exchange pipe and a cooling pipe; the electric heater and the heat exchanger are sequentially arranged on the regeneration gas pipe in the flowing direction of regeneration gas, a cold end gas inlet and a hot end gas outlet of the heat exchanger are communicated with the regeneration gas pipe, a hot end gas inlet of the heat exchanger is communicated with the first heat exchange pipe, a cold end gas outlet of the heat exchanger is communicated with a gas inlet of the cooling assembly, and a gas outlet of the cooling assembly is communicated with the cooling pipe. A gas outlet of the cooling assembly is communicated with a second regenerated gas output pipe. The system can heat the regeneration gas by utilizing the waste heat of the regeneration gas, can save the electric energy used by the electric heater, and integrally improves the operation energy efficiency of the hydrogen purification system.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydrogen purification technical field especially relates to a hydrogen purification regeneration waste heat utilization system. BACKGROUND

[0002] In the process of hydrogen production by electrolysis, in order to further improve the purity of hydrogen, the temperature swing adsorption method is usually used to purify hydrogen, that is, by using the characteristics that the equilibrium adsorption amount of adsorbent changes with temperature, at normal temperature, the adsorbent adsorbs the impurities in hydrogen, improves the purity of hydrogen, when the adsorption amount of adsorbent reaches the limit, the temperature of the through gas is increased, the impurities adsorbed in the adsorbent are desorbed, the adsorption performance of the adsorbent is restored, that is, the regeneration of the adsorbent is completed, the hydrogen purification process is carried out by using three or more adsorption towers, in the process of improving the purity of hydrogen by three or more towers, the three towers are rotated in different states such as adsorption and regeneration, when the adsorbent is regenerated, the regeneration gas is usually heated to 150 DEG C by a heater and flows through the adsorption tower, the impurities adsorbed on the adsorbent are desorbed at high temperature, the regeneration gas mixed with impurities is cooled and returned to the raw gas main pipe for adsorption purification, the qualified gas is stored in the hydrogen storage tank, after the heating and regeneration are completed, the regeneration gas is cooled by a cooler to cool the adsorbent, and after being cooled to normal temperature, the next cycle of adsorption is waited. UTILIZATIONAL CONTENT

[0003] The utility model provides a kind of hydrogen purification regeneration waste heat utilization system, can utilize regeneration gas waste heat to heat regeneration gas, and can save the electric energy used by electric heater, overall improve the operation energy efficiency of hydrogen purification system.

[0004] To achieve the above object, the utility model adopts the following technical scheme:

[0005] A kind of hydrogen purification regeneration waste heat utilization system, including adsorption tower, electric heater, heat exchanger and cooling component;

[0006] The above-mentioned adsorption tower is communicated with raw gas main pipe, hydrogen storage pipe, regeneration gas pipe, first regeneration gas output pipe, first heat exchange pipe and cooling pipe;

[0007] The above-mentioned electric heater and the above-mentioned heat exchanger are sequentially arranged on the above-mentioned regeneration gas pipe along the flow direction of regeneration gas, the cold end gas inlet and the hot end gas outlet of the above-mentioned heat exchanger are communicated with the above-mentioned regeneration gas pipe, the hot end gas inlet of the above-mentioned heat exchanger is communicated with the above-mentioned first heat exchange pipe, the cold end gas outlet of the above-mentioned heat exchanger is communicated with the gas inlet of the above-mentioned cooling component, the gas outlet of the above-mentioned cooling component is communicated with the above-mentioned cooling pipe, and the gas outlet of the above-mentioned cooling component is communicated with the second regeneration gas output pipe;

[0008] The raw material gas mother pipe, the hydrogen storage pipe, the regeneration gas pipe, the first regeneration gas output pipe, the first heat exchange pipe, the cooling pipe and the second regeneration gas output pipe are all provided with control valves to control the flow path of the regeneration gas.

[0009] Preferably, the first temperature detection device and the first flow detection device are arranged on the regeneration gas pipe at the gas inlet of the electric heater, and the second temperature detection device is arranged on the regeneration gas pipe at the gas outlet.

[0010] The first temperature detection device, the first flow detection device and the second temperature detection device are used in cooperation to adjust the heating power of the electric heater so as to keep the temperature of the regeneration gas constant.

[0011] Preferably, the third temperature detection device is arranged on the cooling pipe, and the fourth temperature detection device is arranged on the first regeneration gas output pipe.

[0012] The third temperature detection device and the fourth temperature detection device are used in cooperation to determine the completion of the cooling regeneration of the adsorption tower.

[0013] Preferably, the first heat exchange pipe is communicated with the gas inlet of the cooling assembly.

[0014] Preferably, the cooling assembly comprises a cooler and a gas-liquid separator which are communicated.

[0015] The second heat exchange pipe is communicated between the gas inlet of the cooler and the cold end gas outlet of the heat exchanger, and the gas inlet of the cooler is communicated with the gas inlet pipe.

[0016] The gas outlet of the gas-liquid separator is communicated with the cooling pipe and the second regeneration gas output pipe.

[0017] Preferably, the first regeneration gas output pipe and the second regeneration gas output pipe are both communicated with the raw material gas mother pipe.

[0018] Preferably, the second flow detection device is arranged on the raw material gas mother pipe.

[0019] Compared with the prior art, the hydrogen purification system has the following beneficial effects:

[0020] During the regeneration stage of the adsorbent in the adsorption tower by the regeneration gas, the regeneration gas is preheated by the waste heat of the regeneration gas tail gas, the waste heat in the regeneration gas can be fully utilized, the waste of heat can be avoided, the heating power of the electric heater can be reduced in the subsequent stage, the electric energy can be saved, and the operation energy efficiency of the hydrogen purification system is improved as a whole. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the description of the specific embodiments or the prior art. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0022] Figure 1 The system overall schematic diagram of the embodiment in the present application.

[0023] Mark explanation:

[0024] 1, adsorption tower; 2, electric heater; 3, heat exchanger; 4, cooler; 5, gas-liquid separator; 6, raw gas main pipe; 7, hydrogen storage pipe; 8, regeneration gas pipe; 9, first regeneration gas output pipe; 10, first heat exchange pipe; 11, second heat exchange pipe; 12, cooling pipe; 13, second regeneration gas output pipe; 14, gas inlet pipe; 15, first pneumatic valve; 16, second pneumatic valve; 17, third pneumatic valve; 18, fourth pneumatic valve; 19, fifth pneumatic valve; 20, sixth pneumatic valve; 21, seventh pneumatic valve; 22, eighth pneumatic valve; 23, first temperature detection device; 24, first flow detection device; 25, second temperature detection device; 26, third temperature detection device; 27, fourth temperature detection device; 28, second flow detection device. Specific embodiments

[0025] The technical solutions of the present application will be described below in conjunction with the drawings. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0026] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the utility model, it is necessary to explain, unless another explicit provision and limitation, term "installation", "link", "connection" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication。For ordinary skilled person in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0028] The utility model discloses an embodiment provides a kind of hydrogen purification regeneration waste heat utilization system, including adsorption tower 1, electric heater 2, heat exchanger 3 and cooling assembly, wherein each gas inlet of adsorption tower 1 is respectively communicated with raw material gas main pipe 6, hydrogen storage pipe 7, regeneration gas pipe 8, first regeneration gas output pipe 9, first heat exchange pipe 10 and cooling pipe 12;Specifically, raw material gas main pipe 6 is used for circulating hydrogen that is not adsorbed, hydrogen that is not adsorbed enters adsorption tower 1 and is adsorbed and purified, and then enters gas storage tank through hydrogen storage pipe 7;Electric heater 2 and heat exchanger 3 are sequentially arranged on regeneration gas pipe 8 along the flow direction of regeneration gas, heat exchanger 3 is used for gas-gas heat exchange, specifically, the cold end gas inlet and hot end gas outlet of heat exchanger 3 are communicated with regeneration gas pipe 8, i.e. installed on regeneration gas pipe 8, the hot end gas inlet of heat exchanger 3 is communicated with first heat exchange pipe 10, the cold end gas outlet of heat exchanger 3 is communicated with the gas inlet of cooling assembly, and the gas outlet of cooling assembly is communicated with second regeneration gas output pipe 13, specifically, when adsorbent in adsorption tower 1 is regenerated, heating is first carried out, regeneration gas enters adsorption tower 1 through regeneration gas pipe 8, and sequentially passes through heat exchanger 3 and electric heater 2, wherein when regeneration gas passes through regeneration gas pipe 8 for the first time, it is first heated by electric heater 2, the heated regeneration gas enters adsorption tower 1, so that the adsorbent in adsorption tower 1 is reheated and regenerated, and impurities are carried out, forming regeneration gas tail gas with a certain temperature, and then the regeneration gas tail gas enters heat exchanger 3 through first heat exchange pipe 10, and exchanges heat with the regeneration gas passing through heat exchanger 3 again, thereby preheating the regeneration gas, the heat-exchanged regeneration gas tail gas enters cooling assembly through second heat exchange pipe 11, and after cooling, it is finally output from second regeneration gas output pipe 13, while the preheated regeneration gas is first heated to a certain temperature by electric heater 2, and then enters adsorption tower 1 to heat and regenerate the adsorbent therein, and then enters first heat exchange pipe 10 to form regeneration gas tail gas, and continues to enter heat exchanger 3 for heat exchange, until the adsorbent in adsorption tower 1 is heated and regenerated, at which time electric heater 2 is turned off, and the adsorbent in adsorption tower 1 enters the cooling and regeneration stage, the regeneration gas first enters adsorption tower 1, carries a certain amount of heat, then enters first heat exchange pipe 10, and finally enters cooling assembly and is cooled to a certain temperature, and then reenters adsorption tower 1 through cooling pipe 12 to cool and regenerate the adsorbent in adsorption tower 1, the cooled regeneration gas tail gas is output from first regeneration gas output pipe 9, until the adsorbent is cooled and regenerated, the adsorbent in the whole adsorption tower 1 is regenerated, and the subsequent adsorption tower 1 can re-enter the adsorption stage.

[0029] And raw material gas mother pipe 6, hydrogen storage pipe 7, regeneration gas pipe 8, first regeneration gas output pipe 9, first heat exchange pipe 10, cooling pipe 12 and second regeneration gas output pipe 13 are all provided with control valves, specifically, raw material gas mother pipe 6 is installed with first pneumatic valve 15, hydrogen storage pipe 7 is installed with second pneumatic valve 16, regeneration gas pipe 8 is installed with third pneumatic valve 17, first regeneration gas output pipe 9 is installed with fourth pneumatic valve 18, first heat exchange pipe 10 is installed with fifth pneumatic valve 19, cooling pipe 12 is installed with sixth pneumatic valve 20, second regeneration gas output pipe 13 is installed with seventh pneumatic valve 21; Specifically, in the adsorption stage of adsorption tower 1, first pneumatic valve 15 and second pneumatic valve 16 are opened, and the rest of the pneumatic valves are closed; In the adsorbent heating regeneration stage in adsorption tower 1, third pneumatic valve 17, fifth pneumatic valve 19 and seventh pneumatic valve 21 are opened, and the rest of the pneumatic valves are closed; In the adsorbent cooling regeneration stage in adsorption tower 1, third pneumatic valve 17, fifth pneumatic valve 19, sixth pneumatic valve 20 and fourth pneumatic valve 18 are opened, and the rest of the pneumatic valves are closed.

[0030] Among them, the above-mentioned regeneration gas is the purified hydrogen, and the finally formed regeneration gas tail gas is the impurity-carrying unpurified hydrogen, so that first regeneration gas output pipe 9 and second regeneration gas output pipe 13 are communicated with raw material gas mother pipe 6, and enter adsorption tower 1 together with the unpurified hydrogen to be adsorbed and purified.

[0031] Specifically, the first temperature detecting device 23 and the first flow detecting device 24 are arranged on the regenerating gas pipe 8 at the gas inlet of the electric heater 2, the second temperature detecting device 25 is arranged on the regenerating gas pipe 8 at the gas outlet, the first temperature detecting device 23 is used to detect the temperature of the regenerating gas before entering the electric heater 2, the first flow detecting device 24 is used to detect the flow of the regenerating gas in the regenerating gas pipe 8, and the second temperature detecting device 25 is used to detect the temperature of the regenerating gas after being heated by the electric heater 2. Generally, the temperature of the heated regenerating gas needs to be kept constant. The temperature before heating, the flow, the temperature after heating, and the constant temperature of the heated regenerating gas are used in cooperation with the electric heater 2 to ensure that the temperature of the heated regenerating gas is constant. Of course, the cooperation method is prior art, which will be briefly introduced as follows: first, the heating power of the electric heater 2 is calculated according to the temperature of the regenerating gas detected by the first temperature detecting device 23, the flow detected by the first flow detecting device 24, and the constant temperature of the heated regenerating gas. Then, the electric heater 2 is started to heat the regenerating gas according to the power. When the second temperature detecting device 25 detects the temperature of the regenerating gas, if the temperature reaches the required temperature, the electric heater 2 continues to run according to the power. If the temperature is less than the required temperature, the heating power of the electric heater 2 is increased. If the temperature is greater than the required temperature, the heating power of the electric heater 2 is reduced. Finally, the temperature of the heated regenerating gas reaches the use requirement, wherein, in the embodiment, the temperature of the heated regenerating gas is generally set to 150±3℃, that is, the detection temperature of the second temperature detecting device 25 is 150±3℃. The electric heater 2 is an anti-explosion multi-stage electric heater 2, the first temperature detecting device 23 and the second temperature detecting device 25 are temperature sensors, and the first flow detecting device 24 is a volume flow meter. The first temperature detecting device 23, the second temperature detecting device 25, the first flow detecting device 24, and the temperature value of the heated regenerating gas are used to realize the dynamic adjustment of the electric heater 2, the constant temperature of the heated regenerating gas, and the temperature stability of the adsorbent during heating and regeneration, thereby improving the regeneration efficiency.

[0032] Specifically, the third temperature detecting device 26 is arranged on the cooling pipe 12, which is used to detect the cooling regenerating gas. The fourth temperature detecting device 27 is arranged on the first regenerating gas output pipe 9, which is used to detect the temperature of the tail gas of the cooling regenerating gas. The third temperature detecting device 26 and the fourth temperature detecting device 27 are used in cooperation to determine whether the cooling regeneration of the adsorption tower 1 is completed. Specifically, when the temperature difference detected by the third temperature detecting device 26 and the fourth temperature detecting device 27 is less than 3℃ within a certain time, the cooling regeneration of the adsorbent is completed. In the embodiment, the certain time can be 10 minutes. It can be known that the above-mentioned scheme of using the temperature difference to determine whether the cooling regeneration of the adsorbent is completed is prior art. The third temperature detecting device 26 and the fourth temperature detecting device 27 can be temperature sensors.

[0033] The second flow detection device 28 is installed on the raw gas mother pipe 6, and is a volume flow meter, which is used for monitoring the volume of the gas flow on the raw gas mother pipe 6, so that the user can know conveniently.

[0034] Specifically, the first heat exchange pipe 10 and the air inlet of the cooling assembly are communicated through an air inlet pipe 14, the eighth pneumatic valve 22 is installed on the air inlet pipe 14, the fifth pneumatic valve 19 is located on the first heat exchange pipe 10 between the connecting point of the air inlet pipe 14 and the first heat exchange pipe 10 and the first heat exchange pipe 10 between the heat exchanger 3, and the third pneumatic valve 17, the eighth pneumatic valve 22, the sixth pneumatic valve 20 and the fourth pneumatic valve 18 are opened, and the remaining pneumatic valves are closed in the adsorbent cooling stage in the adsorption tower 1, so that the cooling regenerated gas directly enters the cooling assembly from the air inlet pipe 14 through the first heat exchange pipe 10, the pipeline is shorter, and the cooling time is faster.

[0035] Specifically, the cooling assembly comprises the cooler 4 and the gas-liquid separator 5 which are communicated, the second heat exchange pipe 11 is communicated between the air inlet of the cooler 4 and the cold end air outlet of the heat exchanger 3, the air inlet of the cooler 4 is communicated with the air inlet pipe 14, and the air outlet of the gas-liquid separator 5 is communicated with the cooling pipe 12 and the second regenerated gas output pipe 13; the functions of the cooler 4 and the gas-liquid separator 5 are mainly to reduce the temperature of the regenerated gas and preliminarily separate the impurities (such as moisture) in the regenerated gas.

[0036] The above-mentioned embodiments are only preferred embodiments of the present application, and cannot be used to limit the range of protection of the present application, and any non-essential changes and replacements made by the person skilled in the art on the basis of the present application all belong to the range of protection required by the present application.

Claims

1. A hydrogen purification regeneration waste heat utilization system, characterized in that: It includes an adsorption tower, an electric heater, a heat exchanger and a cooling assembly; The adsorption tower is connected to a raw gas main pipe, a hydrogen storage pipe, a regeneration gas pipe, a first regeneration gas output pipe, a first heat exchange pipe and a cooling pipe; The electric heater and the heat exchanger are sequentially arranged on the regeneration gas pipe along the flow direction of the regeneration gas, the cold end air inlet and the hot end air outlet of the heat exchanger are both connected to the regeneration gas pipe, the hot end air inlet of the heat exchanger is connected to the first heat exchange pipe, the cold end air outlet of the heat exchanger is connected to the air inlet of the cooling component, the air outlet of the cooling component is connected to the cooling pipe, and the air outlet of the cooling component is connected to the second regeneration gas output pipe; The raw gas main pipe, hydrogen storage pipe, regeneration gas pipe, first regeneration gas output pipe, first heat exchange pipe, cooling pipe and second regeneration gas output pipe are all provided with control valves to control the flow path of the regeneration gas.

2. The hydrogen purification regeneration waste heat utilization system according to claim 1, characterized in that: The regeneration gas pipe at the air inlet of the electric heater is provided with a first temperature detection device and a first flow detection device, and the regeneration gas pipe at the air outlet is provided with a second temperature detection device; The first temperature detection device, the first flow detection device and the second temperature detection device are used in conjunction with each other to adjust the heating power of the electric heater so that the temperature of the regeneration gas is constant.

3. The hydrogen purification regeneration waste heat utilization system according to claim 1, characterized in that: The cooling pipe is provided with a third temperature detection device, and the first regeneration gas output pipe is provided with a fourth temperature detection device; The third temperature detection device and the fourth temperature detection device are used in conjunction with each other to determine the completion of the cooling and regeneration of the adsorption tower.

4. The hydrogen purification regeneration waste heat utilization system according to claim 1, characterized in that: An air intake pipe is connected between the first heat exchange tube and the air inlet of the cooling component.

5. The hydrogen purification regeneration waste heat utilization system according to claim 4, characterized in that: The cooling assembly includes a cooler and a gas-liquid separator connected to each other; A second heat exchange pipe is connected between the air inlet of the cooler and the cold end air outlet of the heat exchanger, and the air inlet of the cooler is connected to the air inlet pipe; The gas outlet of the gas-liquid separator is communicated with both the cooling pipe and the second regeneration gas output pipe.

6. The hydrogen purification regeneration waste heat utilization system according to claim 1, characterized in that: The first regeneration gas output pipe and the second regeneration gas output pipe are both connected to the raw gas main pipe.

7. The hydrogen purification regeneration waste heat utilization system according to claim 1, characterized in that: A second flow detection device is installed on the raw gas main pipe.

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