Process device for formaldehyde tail gas treatment and control method thereof

Abstract

The invention relates to the technical field of chemical engineering, and discloses a process device for formaldehyde tail gas treatment, which comprises a shell, a filter case, a first sampling case, a membrane separation case, a second sampling case, a sampling detection assembly and a controller assembly. A filtering pipeline is arranged in the filtering machine box, the first sampling machine box is arranged in the shell, one side of the first sampling machine box is connected with the other end of the filtering pipeline, the membrane separation machine box is arranged in the shell, one side of the membrane separation machine box is connected with the other side of the first sampling machine box, the second sampling machine box is arranged in the shell, and one side of the second sampling machine box is connected with the other side of the membrane separation machine box. The other side of the controller assembly is connected with the gas storage tank, and the controller assembly is connected with the first detection part and the first control valve. According to the hydrogen recovery and purification device, it is guaranteed that the hydrogen recovery and purification process can be safely, orderly and efficiently carried out, the recovery rate of hydrogen is guaranteed, and the recovery purity of hydrogen is also guaranteed. The invention further discloses a control method of the process device for formaldehyde tail gas treatment.

Description

Technical Field

[0001] The present application relates to the field of chemical technology, for example, to a process device for treating formaldehyde tail gas and a control method thereof. Background Art

[0002] During the production process of industrial formaldehyde, the exhaust gas produced contains 18%-21% hydrogen, 0.1% formaldehyde gas, 0.01% methanol, a small amount of methane gas, 0.4% carbon monoxide gas, 3.6-4.0% carbon dioxide, and the rest is 74% nitrogen. Direct emission of industrial formaldehyde exhaust gas will cause environmental pollution and affect people's health. At the same time, direct emission of combustible gas will cause safety hazards and is also a huge waste of resources.

[0003] Due to the increasingly severe environmental situation, companies are not allowed to directly discharge or emit the exhaust gas generated during the formaldehyde production process in an unorganized manner. Therefore, formaldehyde production companies currently have to consider recycling this gas. Generally, the gas is directly burned to generate steam for heating. However, this method only utilizes its calorific value, and the effective gas components are not fully utilized, resulting in a huge waste of resources.

[0004] Therefore, how to safely and efficiently recover hydrogen from tail gas and ensure the purity of the recovered hydrogen has become a technical problem that needs to be urgently solved by those skilled in the art.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0006] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical elements or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0007] The disclosed embodiments provide a process device for treating formaldehyde tail gas and a control method thereof, which ensure that the hydrogen recovery and purification process can be carried out safely, orderly and efficiently, thereby ensuring both the recovery rate and the purity of the hydrogen.

[0008] In some embodiments, a process device for treating formaldehyde exhaust gas includes: a housing, a filter housing, a first sampling housing, a membrane separation housing, a second sampling housing, a sampling detection component, and a controller component. The housing is provided with an access port at one end and a gas storage tank at the other end, and an exhaust gas pretreatment structure is provided at the end of the housing corresponding to the access port; the filter housing is provided in the housing, and a filter pipe is provided in the filter housing, and a filter element is provided in the filter pipe, wherein one end of the filter pipe is connected to the exhaust gas pretreatment structure; the first sampling housing is provided in the housing, and one side of the first sampling housing is connected to the other end of the filter pipe, wherein the first sampling housing is also connected to one end of the filter pipe close to the exhaust gas pretreatment structure through a first return pipe, and the first return pipe is connected to the filter pipe through the second return pipe. A first control valve is arranged on the pipeline; a membrane separation box is arranged in the shell, and one side of the membrane separation box is connected to the other side of the first sampling box, a semi-permeable membrane body is arranged in the membrane separation box, a temperature regulator for adjusting the internal temperature of the membrane separation box and a pressure regulator for adjusting the internal pressure of the membrane separation box are arranged on the membrane separation box; a second sampling box is arranged in the shell, and one side of the membrane separation box is connected to the other side of the membrane separation box, and the other side of the membrane separation box is connected to the gas storage tank, wherein the second sampling box is also connected to the membrane separation box near the first sampling box through a second reflux pipeline. The first detection part is arranged on one side of the shell body and is connected to the first sampling box correspondingly, and is used to detect whether there are particulate impurities in the mixed gas in the first sampling box. The second detection part is arranged on one side of the shell body and is connected to the second sampling box correspondingly, and is used to detect the hydrogen content information in the mixed gas in the second sampling box. The controller component is connected to the first detection part and the first control valve, and is used to control the first control valve to open the first return pipe when there are particulate impurities in the mixed gas in the first sampling box. The controller component is also connected to the second detection part, the second control valve, the temperature regulator and the pressure regulator, and is used to control the second control valve to open the second return pipe according to the hydrogen content information in the mixed gas in the second sampling box and when the hydrogen content in the mixed gas is less than 95%, and control the temperature regulator to adjust the temperature inside the membrane separation box and control the pressure regulator to adjust the pressure inside the membrane separation box.

[0009] In some embodiments, a control method for a process device for treating formaldehyde tail gas is used to control a process device for treating formaldehyde tail gas as described in any one of the above, comprising: Detecting whether there are particulate debris in the mixed gas in the first sampling machine box; In the case where particulate impurities exist in the mixed gas in the first sampling machine box, controlling the first control valve to open the first return pipe; Detecting hydrogen content information in the mixed gas in the second sampling machine box; According to the hydrogen content information in the mixed gas in the second sampling box, and when the hydrogen content in the mixed gas is less than 95%, the second control valve is controlled to open the second reflux pipe, and the temperature regulator is controlled to adjust the temperature inside the membrane separation box, and the pressure regulator is controlled to adjust the pressure inside the membrane separation box.

[0010] The process device for treating formaldehyde tail gas and the control method thereof provided in the embodiments of the present disclosure can achieve the following technical effects: Before recovering and purifying hydrogen, the use of a filter box in conjunction with sampling and detection technology can effectively and thoroughly remove particulate matter in the mixed gas, reduce the impact of particulate matter on subsequent hydrogen purification, avoid damage to the semipermeable membrane, and ensure that the hydrogen recovery and purification process can be carried out safely, orderly and efficiently. After filtering and removing impurities, the membrane separation technology is used in conjunction with sampling and detection technology. When the hydrogen content in the mixed gas is less than 95%, the second control valve is controlled to open the second reflux pipe, and the temperature regulator is controlled to adjust the temperature inside the membrane separation box and the pressure regulator is controlled to adjust the pressure inside the membrane separation box. This allows hydrogen to have the maximum permeability when passing through the semipermeable membrane, while intercepting impurity gases, thereby ensuring both the recovery rate and the purity of hydrogen recovery.

[0011] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein: Figure 1 is a schematic structural diagram of a process device for treating formaldehyde tail gas provided by an embodiment of the present disclosure; Figure 2 is a block diagram of a controller component provided by an embodiment of the present disclosure; Figure 3 is a schematic structural diagram of an exhaust gas pretreatment structure provided in an embodiment of the present disclosure; Figure 4 is a structural schematic diagram of an on-off valve provided in an embodiment of the present disclosure; Figure 5 is a schematic structural diagram of an incinerator provided in an embodiment of the present disclosure; Figure 6 is a schematic diagram of the structure of a pressure swing adsorption chassis provided in an embodiment of the present disclosure; Figure 7 is a block diagram of another controller component provided by an embodiment of the present disclosure; Figure 8is a schematic diagram of a control method for a process device for treating formaldehyde tail gas provided by an embodiment of the present disclosure; Fig. 9 is a schematic diagram of another control method for a process device for treating formaldehyde tail gas provided by an embodiment of the present disclosure; Fig.10 It is a structural block diagram of a process device for treating formaldehyde tail gas provided in an embodiment of the present disclosure.

[0013] Reference numerals: 100, shell; 101, access port; 102, gas storage tank; 103, tail gas pretreatment structure; 104, spray box; 105, drying box; 106, spray plate; 107, water storage tank; 108, electric heating plate; 109, incinerator; 110, on-off valve; 111, shock-absorbing base; 112, induced draft fan; 200, filter box; 201, filter pipeline; 300, first sampling box; 301, first return pipeline; 302, first control valve; 400, membrane separation box; 401, semipermeable membrane body; 4 02, temperature regulator; 403, pressure regulator; 500, second sampling box; 501, second return pipe; 502, second control valve; 600, sampling detection component; 601, first detection part; 602, second detection part; 603, third detection part; 700, controller component; 800, pressure swing adsorption box; 900, third sampling box; 901, third return pipe; 902, third control valve; 1000, processor; 1001, memory; 1002, communication interface; 1003, bus. DETAILED DESCRIPTION

[0014] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0015] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0016] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0017] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0018] Unless otherwise stated, the term "plurality" means two or more.

[0019] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B indicates: A or B.

[0020] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0021] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0022] Combination Figure 1-2As shown, an embodiment of the present disclosure provides a process device for treating formaldehyde tail gas, including: a shell 100, a filter box 200, a first sampling box 300, a membrane separation box 400, a second sampling box 500, a sampling detection component 600 and a controller component 700.The shell 100 is provided with an access port 101 at one end and a gas storage tank 102 at the other end, and an exhaust gas pretreatment structure 103 is provided at an end of the shell 100 corresponding to the access port 101; a filter box 200 is provided in the shell 100, and a filter pipe 201 is provided in the filter box 200, and a filter element is provided in the filter pipe 201, wherein one end of the filter pipe 201 is connected to the exhaust gas pretreatment structure 103; a first sampling box 300 is provided in the shell 100, and one side thereof is connected to the other end of the filter pipe 201, wherein the first sampling box 300 is also connected to the end of the filter pipe 201 close to the exhaust gas pretreatment structure 103 through the first reflux pipe 301 The first sampling box 400 is provided in the housing 100, and one side of the first sampling box 400 is connected to the other side of the first sampling box 300. The membrane separation box 400 is provided with a semi-permeable membrane body 401, on which a temperature regulator 402 for adjusting the internal temperature of the membrane separation box 400 and a pressure regulator 403 for adjusting the internal pressure of the membrane separation box 400 are provided; the second sampling box 500 is provided in the housing 100, and one side of the second sampling box 500 is connected to the other side of the membrane separation box 400, and the other side of the second sampling box 500 is connected to the gas storage tank 102, wherein the second sampling box 500 is also connected to the membrane separation box 400 through the second reflux pipe 501. The first sampling box 300 is connected to one side thereof, and a second control valve 502 is arranged on the second return pipe 501; the sampling detection assembly 600 includes a first detection part 601 and a second detection part 602, the first detection part 601 is arranged on one side of the housing 100, and is connected to the first sampling box 300 correspondingly, and is used to detect whether there are particulate impurities in the mixed gas in the first sampling box 300, and the second detection part 602 is arranged on one side of the housing 100, and is connected to the second sampling box 500 correspondingly, and is used to detect the hydrogen content information in the mixed gas in the second sampling box 500; the controller assembly 700 is connected to both the first detection part 601 and the first control valve 302 , which is used to control the first control valve 302 to open the first reflux pipe 301 when particulate impurities exist in the mixed gas in the first sampling box 300. The controller component 700 is also connected to the second detection unit 602, the second control valve 502, the temperature regulator 402 and the pressure regulator 403, and is used to control the second control valve 502 to open the second reflux pipe 501 according to the hydrogen content information in the mixed gas in the second sampling box 500 and when the hydrogen content in the mixed gas is less than 95%, and control the temperature regulator 402 to adjust the temperature inside the membrane separation box 400 and control the pressure regulator 403 to adjust the pressure inside the membrane separation box 400.

[0023] By using the process device for treating formaldehyde tail gas provided by the embodiment of the present disclosure, before recovering and purifying hydrogen, the filter box 200 is used in combination with the sampling and detection technology to effectively and thoroughly remove particulate impurities in the mixed gas, reduce the impact of particulate impurities on subsequent hydrogen purification, avoid damage to the semi-permeable membrane body 401, and ensure that the hydrogen recovery and purification process can be carried out safely, orderly and efficiently. After filtering and removing impurities, the membrane separation technology is used in combination with the sampling and detection technology. When the hydrogen content in the mixed gas is less than 95%, the second control valve 502 is controlled to open the second reflux pipe 501, and the temperature regulator 402 is controlled to adjust the temperature inside the membrane separation box 400 and the pressure regulator 403 is controlled to adjust the pressure inside the membrane separation box 400, so that the hydrogen has the maximum permeability when passing through the semi-permeable membrane body 401, and the impurity gas is intercepted, thereby ensuring both the recovery rate of hydrogen and the recovery purity of hydrogen.

[0024] Optionally, the filter pipe 201 is arranged in an S shape in the filter box 200. In this way, the effective contact time between the exhaust gas and the filter element is increased, sufficient filtering time is provided, and particulate impurities in the exhaust gas can be thoroughly and effectively removed.

[0025] It can be understood that the semi-permeable membrane body 401 can be a proton membrane, an ion membrane or a ceramic membrane. The proton membrane, the ion membrane and the ceramic membrane are all existing technologies and will not be described in detail here.

[0026] Optionally, the temperature regulation of the membrane separation box 400 by the temperature regulator 402 and the pressure regulation of the membrane separation box 400 by the pressure regulator 403 are divided into three gears, wherein the first gear is a high temperature and high pressure environment, the second gear is a medium temperature and medium pressure environment, and the third gear is a low temperature and low pressure environment. In this way, by adjusting the inside of the membrane separation box 400 to a high temperature and high pressure environment, a medium temperature and medium pressure environment, and a low temperature and low pressure environment in sequence, the demand for purifying hydrogen in tail gas in various different states is met, so that hydrogen always has the maximum permeability, can effectively remove impurity gases in tail gas, and ensure the recovery quality of hydrogen.

[0027] Optionally, high temperature and high pressure means that the temperature inside the membrane separation box 400 is greater than or equal to 70 degrees and less than or equal to 90 degrees, and the pressure inside the membrane separation box 400 is greater than or equal to 3Mpa and less than or equal to 5Mpa; medium temperature and medium pressure means that the temperature inside the membrane separation box 400 is greater than or equal to 50 degrees and less than 70 degrees, and the pressure inside the membrane separation box 400 is greater than or equal to 2Mpa and less than 3Mpa; low temperature and low pressure means that the temperature inside the membrane separation box 400 is greater than or equal to 30 degrees and less than 50 degrees, and the pressure inside the membrane separation box 400 is greater than or equal to 1Mpa and less than 2Mpa. In this way, when controlling the temperature and pressure inside the membrane separation box 400, the temperature and pressure inside the membrane separation box 400 can be kept within a reasonable range at all times, avoiding the situation where the temperature and pressure are too high or too low, which affects the use of the semi-permeable membrane body 401, and ensuring that hydrogen recovery can be carried out safely and orderly.

[0028] like Figure 3-5 As shown, optionally, the tail gas pretreatment structure 103 includes a spray box 104 and a drying box 105, which are sequentially arranged between the access port 101 and the filter box 200, and the two sides of the spray box 104 are respectively connected to the access port 101 and the drying box 105, wherein a spray plate 106 is arranged in the spray box 104, and a water storage tank 107 connected to the spray plate 106 is arranged on it, and an electric heating plate 108 is arranged in the drying box 105. In this way, a small amount of methanol, formaldehyde and other gases in the tail gas can be removed by spraying, and after the cleaned gas enters the drying box 105, the electric heating plate 108 is used to dry the gas, so as to ensure that the tail gas can be safely and efficiently purified in the subsequent impurity removal operation.

[0029] Optionally, a humidity sensor is provided in the drying box 105, and the humidity sensor is used to detect the humidity of the gas entering the drying box 105. The humidity sensor and the electric heating plate 108 are both connected to the controller component 700, and the controller component 700 is used to control the electric heating plate 108 to heat and dry the gas inside the drying box 105 according to the humidity of the gas. In this way, the gas can be dried efficiently and quickly, and the drying efficiency can be improved.

[0030] Optionally, the controller assembly 700 is also used to control the electric heating plate 108 to adjust the temperature of the gas inside the drying box 105 to a set temperature when the gas is in a dry state, wherein the set temperature is greater than or equal to 30 degrees and less than or equal to 40 degrees. In this way, the state of the gas after drying can be made more stable, which is helpful for better subsequent treatment of the gas, and prevents the high-temperature gas from damaging the filter element, thereby ensuring that the filter box 200 can operate safely and reliably.

[0031] Optionally, an incinerator 109 correspondingly connected to the membrane separation box 400 is provided on one side of the housing 100, and the connection position between the incinerator 109 and the membrane separation box 400 is located between the semipermeable membrane body 401 and the side wall of the membrane separation box 400 close to the first sampling box 300. In this way, since the impurity gas that cannot pass through the semipermeable membrane body 401 is trapped, the incinerator 109 is connected between the semipermeable membrane body 401 and the side wall of the membrane separation box 400 close to the first sampling box 300, so that the trapped impurity gas can enter the incinerator 109, so that the trapped impurity gas is incinerated by the incinerator 109 to reduce pollution to the environment.

[0032] Optionally, the tail gas pretreatment structure 103, the filter pipe 201, the first sampling box 300, the membrane separation box 400 and the second sampling box 500 are arranged side by side in sequence along the conveying direction of the tail gas, and an on-off valve 110 is independently arranged between two adjacent ones. In this way, the gas delivery can be controlled more flexibly, so that according to the treatment requirements of the tail gas, by controlling the opening and closing of the on-off valve 110, the flow path of the gas can be adjusted in conjunction with the reflux pipe, so as to better treat the gas, improve the treatment quality, and ensure the quality of hydrogen.

[0033] Optionally, a shock-absorbing base 111 is provided at the bottom of the housing 100. In this way, the stability of the installation and operation of the process device is ensured.

[0034] Optionally, an induced draft fan 112 is provided at the position of the on-off valve 110, and the induced draft fan 112 and the on-off valve 110 are arranged in sequence along the conveying direction of the exhaust gas. In this way, the induced draft fan 112 is used to provide power for the conveying of the gas, thereby improving the conveying efficiency of the gas and thus improving the processing efficiency of the exhaust gas.

[0035] like Figure 6-7 As shown, optionally, the process device for treating formaldehyde tail gas further includes: a pressure swing adsorption chassis 800. The pressure swing adsorption chassis 800 is arranged in the housing 100, and one side of the pressure swing adsorption chassis 800 is connected to the other side of the second sampling chassis 500, and the other side of the pressure swing adsorption chassis 800 is connected to the gas storage tank 102. In this way, by using the pressure swing adsorption technology in combination with the membrane separation technology, impurity gases such as moisture, carbon monoxide, carbon dioxide, oxygen and nitrogen in the mixed gas can be adsorbed, and the hydrogen that is difficult to adsorb flows to the gas storage tank 102, thereby further improving the purity of the hydrogen.

[0036] It can be understood that the pressure swing adsorption chassis 800 is a pressure swing adsorber, which is a prior art and the specific structure will not be described in detail here.

[0037] Optionally, a third sampling box 900 is further provided between the pressure swing adsorption box 800 and the gas storage tank 102, and the third sampling box 900 is located in the housing 100, wherein the third sampling box 900 is also connected to the second sampling box 500 through a third return pipe 901, and a third control valve 902 is provided on the third return pipe 901. In this way, by providing the third sampling box 900 and cooperating with the third return pipe 901, the gas treated by the pressure swing adsorption can be sampled and tested again, so as to accurately understand the treatment of the gas and further ensure that the obtained hydrogen has a high purity.

[0038] Optionally, the third return pipe 901 is an integrated structure with the second return pipe 501. In this way, the convenience of installation is improved, while materials are saved and costs are reduced.

[0039] It can be understood that when the second control valve 502 is in the open state, the third control valve 902 cuts off the passage of the third return pipe 901. Conversely, when the third control valve 902 is in the open state, the second control valve 502 cuts off the passage of the second return pipe 501. It will not be repeated here.

[0040] Optionally, the detection component further includes a third detection unit 603, which is disposed on one side of the housing 100 and is connected to the third sampling box 900. The third detection unit 603 is used to detect the purity information of hydrogen in the third sampling box 900. The third detection unit 603 and the third control valve 902 are both connected to the controller component 700. The controller component 700 is used to control the third control valve 902 to open the third reflux pipe 901 when the purity of hydrogen is less than 99%. In this way, in the tail gas treatment process, by performing pressure swing adsorption treatment on the gas and cooperating with sampling detection, when the purity of hydrogen is less than 99%, the third control valve 902 is controlled to open the third reflux pipe 901, and the gas is subjected to pressure swing adsorption treatment again, so that after multiple pressure swing adsorption treatments, the gas is subjected to more than 99% of the hydrogen obtained, thereby maximizing the purity of the obtained hydrogen and improving the quality of the hydrogen.

[0041] It can be understood that the first detection unit 601, the second detection unit 602 and the second detection unit 602 are all gas chromatographs. The gas chromatograph is a prior art and its specific structure will not be repeated here.

[0042] Combination Figure 8-9 As shown, the embodiment of the present disclosure provides a control method for a process device for treating formaldehyde tail gas, which is used to control the process device for treating formaldehyde tail gas as described in any one of the above items, including: S01, detecting whether there are particulate impurities in the mixed gas in the first sampling machine box; S02, when particulate matter exists in the mixed gas in the first sampling machine box, controlling the first control valve to open the first reflux pipe; S03, detecting the hydrogen content information in the mixed gas in the second sampling box; S04, according to the hydrogen content information in the mixed gas in the second sampling box, and when the hydrogen content in the mixed gas is less than 95%, control the second control valve to open the second reflux pipe, and control the temperature regulator to adjust the temperature inside the membrane separation box and control the pressure regulator to adjust the pressure inside the membrane separation box.

[0043] By adopting the control method of the process device for treating formaldehyde tail gas provided by the embodiment of the present disclosure, before recovering and purifying hydrogen, a filter box is used in combination with sampling and detection technology to effectively and thoroughly remove particulate impurities in the mixed gas, reduce the influence of particulate impurities on subsequent hydrogen purification, avoid damage to the semipermeable membrane body, and ensure that the hydrogen recovery and purification process can be carried out safely, orderly and efficiently. After filtering and removing impurities, membrane separation technology is used in combination with sampling and detection technology. When the hydrogen content in the mixed gas is less than 95%, the second control valve is controlled to open the second reflux pipe, and the temperature regulator is controlled to adjust the temperature inside the membrane separation box and the pressure regulator is controlled to adjust the pressure inside the membrane separation box. This allows hydrogen to have the maximum permeability when passing through the semipermeable membrane body, and intercepts impurity gases, thereby ensuring both the recovery rate of hydrogen and the recovery purity of hydrogen.

[0044] Optionally, before detecting whether there are particulate impurities in the mixed gas in the first sampling box, the process includes: controlling the spray box and the drying box to respectively perform spraying and drying operations on the tail gas. In this way, a small amount of methanol, formaldehyde and other gases in the tail gas can be removed by spraying, and after the cleaned gas enters the drying box, the gas is dried by the electric heating plate to ensure that the tail gas can be safely and efficiently purified in the subsequent process.

[0045] Optionally, controlling the drying box to perform drying operation on the tail gas includes: detecting the humidity of the gas entering the drying box; and controlling the electric heating plate to heat and dry the gas inside the drying box according to the humidity of the gas. In this way, the moisture of the gas is removed so that the gas can be further processed safely and efficiently.

[0046] Optionally, after controlling the electric heating plate to heat and dry the gas inside the drying box according to the humidity of the gas, the method further includes: when the gas is in a dry state, controlling the electric heating plate to adjust the temperature of the gas inside the drying box to a set temperature, wherein the set temperature is greater than or equal to 30 degrees and less than or equal to 40 degrees. In this way, the state of the gas after drying can be made more stable, which is helpful for better subsequent treatment of the gas, and avoids high-temperature gas from damaging the filter element, thereby ensuring that the filter box can operate safely and reliably.

[0047] Optionally, when there are particulate impurities in the mixed gas in the first sampling box, after controlling the first control valve to open the first return pipe, the method further includes: when there are no particulate impurities in the mixed gas in the first sampling box, controlling the first control valve to cut off the first return pipe, and controlling the on-off valve between the first sampling box and the membrane separation box to open. In this way, it can ensure that particulate impurities in the gas are completely removed, avoid the situation where particulate impurities affect subsequent impurity removal operations, and ensure the stability and safety of the impurity removal process.

[0048] Optionally, controlling the temperature regulator to adjust the temperature inside the membrane separation box and controlling the pressure regulator to adjust the pressure inside the membrane separation box includes: controlling the temperature regulator and the pressure regulator to sequentially perform the first gear, the second gear, and the third gear to adjust the temperature and pressure inside the membrane separation box. In this way, by sequentially adjusting the inside of the membrane separation box to a high-temperature and high-pressure environment, a medium-temperature and medium-pressure environment, and a low-temperature and low-pressure environment, the need for purifying hydrogen in tail gas in various states is met, so that hydrogen always has the maximum permeability, can effectively remove impurity gases in the tail gas, and ensure the recovery quality of hydrogen.

[0049] Optionally, according to the concentration information of hydrogen in the mixed gas in the second sampling box, and when the concentration of hydrogen in the mixed gas is less than 95%, the second control valve is controlled to open the second reflux pipeline, and the temperature regulator is controlled to adjust the temperature inside the membrane separation box and the pressure regulator is controlled to adjust the pressure inside the membrane separation box, and then the following steps are included: S05, detecting the purity information of hydrogen in the third sampling box; S04, according to the purity information of hydrogen in the third sampling box, and when the purity of hydrogen is less than 99%, the third control valve is controlled to open the third reflux pipeline. In this way, in the tail gas treatment process, by performing pressure swing adsorption treatment on the gas and cooperating with sampling detection, when the purity of hydrogen is less than 99%, the third control valve is controlled to open the third reflux pipeline, and the gas is subjected to pressure swing adsorption treatment again, so that after multiple pressure swing adsorption treatments, the gas obtains more than 99% of hydrogen, thereby maximizing the purity of the obtained hydrogen and improving the quality of hydrogen.

[0050] Combination Fig.10As shown, an embodiment of the present disclosure provides a process device for treating formaldehyde tail gas, including a processor 1000 and a memory 1001. Optionally, the device may also include a communication interface 1002 and a bus 1003. The processor 1000, the communication interface 1002, and the memory 1001 may communicate with each other through the bus 1003. The communication interface 1002 may be used for information transmission. The processor 1000 may call the logic instructions in the memory 1001 to execute the control method of the process device for treating formaldehyde tail gas of the above embodiment.

[0051] In addition, the logic instructions in the above-mentioned memory 1001 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product.

[0052] The memory 1001 is a computer-readable storage medium that can be used to store software programs and computer executable programs, such as program instructions / modules corresponding to the method in the embodiment of the present disclosure. The processor 1000 executes the function application and data processing by running the program instructions / modules stored in the memory 1001, that is, the control method of the process device for formaldehyde tail gas treatment in the above embodiment is realized.

[0053] The memory 1001 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required for at least one function; the data storage area may store data created according to the use of the terminal device, etc. In addition, the memory 1001 may include a high-speed random access memory and may also include a non-volatile memory.

[0054] An embodiment of the present disclosure provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured to execute the control method of the process device for treating formaldehyde tail gas.

[0055] An embodiment of the present disclosure provides a computer program product, which includes a computer program stored on a computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the computer executes the control method of the process device for treating formaldehyde exhaust gas.

[0056] The computer-readable storage medium mentioned above may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0057] The technical solution of the embodiment of the present disclosure can be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiment of the present disclosure. The aforementioned storage medium may be a non-transient storage medium, including: a USB flash drive, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a disk or an optical disk, and other media that can store program codes, or a transient storage medium.

[0058] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The embodiments represent only possible changes. Unless explicitly required, separate components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates, the singular forms of "a", "an" and "the" are intended to include plural forms as well. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of one or more associated listings. In addition, when used in this application, the term "comprise" and its variants "comprises" and / or comprising refer to the presence of stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the presence of other identical elements in the process, method or device including the elements. In this article, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the embodiments may refer to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts can refer to the description of the method part.

[0059] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software may depend on the specific application and design constraints of the technical solution. The technicians may use different methods for each specific application to implement the described functions, but such implementations should not be considered to exceed the scope of the embodiments of the present disclosure. The technicians may clearly understand that, for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above may refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

[0060] In the embodiments disclosed herein, the disclosed methods and products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units can be only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between each other shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to implement this embodiment. In addition, each functional unit in the embodiment of the present disclosure may be integrated in a processing unit, or each unit may exist physically alone, or two or more units may be integrated in one unit.

[0061] The flowchart and block diagram in the accompanying drawings show the possible architecture, function and operation of the system, method and computer program product according to the embodiment of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. In the description corresponding to the flowchart and the block diagram in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in a different order from the order disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. Each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented by a dedicated hardware-based system that performs the specified functions or actions, or may be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A process device for treating formaldehyde tail gas, characterized in that: include: A shell (100) having an access port (101) at one end and a gas storage tank (102) connected at the other end, and an exhaust gas pretreatment structure (103) disposed at an end of the shell (100) corresponding to the access port (101); A filter box (200) is arranged in the housing (100), and a filter pipe (201) is arranged in the filter box (200), and a filter element is arranged in the filter pipe (201), wherein one end of the filter pipe (201) is connected to the exhaust gas pretreatment structure (103); A first sampling box (300) is disposed in the housing (100), and one side of the first sampling box is connected to the other end of the filter pipe (201), wherein the first sampling box (300) is also connected to one end of the filter pipe (201) close to the exhaust gas pretreatment structure (103) via a first return pipe (301), and a first control valve (302) is disposed on the first return pipe (301); A membrane separation box (400) is arranged in the housing (100), and one side of the membrane separation box is connected to the other side of the first sampling box (300). A semi-permeable membrane body (401) is arranged in the membrane separation box (400), and a temperature regulator (402) for adjusting the internal temperature of the membrane separation box (400) and a pressure regulator (403) for adjusting the internal pressure of the membrane separation box (400) are arranged on the membrane separation box (400); A second sampling machine box (500) is arranged in the housing (100), and one side of the second sampling machine box is connected to the other side of the membrane separation machine box (400), and the other side of the second sampling machine box is connected to the gas storage tank (102), wherein the second sampling machine box (500) is also connected to the side of the membrane separation machine box (400) close to the first sampling machine box (300) through a second return pipe (501), and a second control valve (502) is arranged on the second return pipe (501); The sampling detection assembly (600) comprises a first detection unit (601) and a second detection unit (602), wherein the first detection unit (601) is arranged on one side of the housing (100) and is correspondingly connected to the first sampling box (300) and is used to detect whether particulate impurities are present in the mixed gas in the first sampling box (300), and the second detection unit (602) is arranged on one side of the housing (100) and is correspondingly connected to the second sampling box (500) and is used to detect information on the hydrogen content in the mixed gas in the second sampling box (500); The controller component (700) is connected to the first detection unit (601) and the first control valve (302) and is used to control the first control valve (302) to open the first return pipe (301) when particulate impurities are present in the mixed gas in the first sampling box (300). The controller component (700) is also connected to the second detection unit (602), the second control valve (502), the temperature regulator (402) and the pressure regulator (403) and is used to control the second control valve (502) to open the second return pipe (501) based on the hydrogen content information in the mixed gas in the second sampling box (500) and when the hydrogen content in the mixed gas is less than 95%, and to control the temperature regulator (402) to adjust the temperature inside the membrane separation box (400) and to control the pressure regulator (403) to adjust the pressure inside the membrane separation box (400).

2. The process device for treating formaldehyde tail gas according to claim 1, characterized in that: The exhaust gas pretreatment structure (103) comprises a spray box (104) and a drying box (105), wherein the spray box (104) and the drying box (105) are arranged in sequence between the access port (101) and the filter box (200), and the two sides of the spray box (104) are respectively connected to the access port (101) and the drying box (105), wherein a spray plate (106) is arranged in the spray box (104), and a water storage tank (107) connected to the spray plate (106) is arranged on the spray box, and an electric heating plate (108) is arranged in the drying box (105).

3. The process device for treating formaldehyde tail gas according to claim 1, characterized in that: An incinerator (109) correspondingly connected to the membrane separation box (400) is provided on one side of the housing (100), and the connection position between the incinerator (109) and the membrane separation box (400) is located between the semi-permeable membrane body (401) and the side wall of the membrane separation box (400) close to the first sampling box (300).

4. The process device for treating formaldehyde tail gas according to claim 1, characterized in that: The exhaust gas pretreatment structure (103), the filter pipe (201), the first sampling machine box (300), the membrane separation machine box (400), and the second sampling machine box (500) are arranged in parallel in sequence along the exhaust gas conveying direction, and an on-off valve (110) is independently arranged between two adjacent ones.

5. The process device for treating formaldehyde tail gas according to any one of claims 1 to 4, characterized in that: Also includes: The pressure swing adsorption box (800) is arranged in the housing (100), and one side of the pressure swing adsorption box is connected to the other side of the second sampling box (500), and the other side of the pressure swing adsorption box (800) is connected to the gas storage tank (102).

6. The process device for treating formaldehyde tail gas according to claim 5, characterized in that: A third sampling machine box (900) is also provided between the pressure swing adsorption machine box (800) and the gas storage tank (102), and the third sampling machine box (900) is located in the housing (100), wherein the third sampling machine box (900) is also connected to the second sampling machine box (500) via a third return pipe (901), and a third control valve (902) is provided on the third return pipe (901).

7. The process device for treating formaldehyde tail gas according to claim 6, characterized in that: The detection component also includes a third detection part (603), which is arranged on one side of the shell (100) and is correspondingly connected to the third sampling box (900). The third detection part (603) is used to detect the purity information of hydrogen in the third sampling box (900). The third detection part (603) and the third control valve (902) are both connected to the controller component (700). The controller component (700) is used to control the third control valve (902) to open the third reflux pipeline (901) when the purity of hydrogen is less than 99%.

8. A control method for a process device for treating formaldehyde tail gas, used for controlling the process device for treating formaldehyde tail gas according to any one of claims 1 to 7, characterized in that: include: Detecting whether there are particulate debris in the mixed gas in the first sampling machine box; In the case where particulate impurities exist in the mixed gas in the first sampling machine box, controlling the first control valve to open the first return pipe; Detecting hydrogen content information in the mixed gas in the second sampling machine box; According to the hydrogen content information in the mixed gas in the second sampling box, and when the hydrogen content in the mixed gas is less than 95%, the second control valve is controlled to open the second reflux pipe, and the temperature regulator is controlled to adjust the temperature inside the membrane separation box, and the pressure regulator is controlled to adjust the pressure inside the membrane separation box.

9. The control method for a process device for treating formaldehyde tail gas according to claim 8, characterized in that: According to the concentration information of hydrogen in the mixed gas in the second sampling box, and when the concentration of hydrogen in the mixed gas is less than 95%, the second control valve is controlled to open the second reflux pipeline, and the temperature regulator is controlled to adjust the temperature inside the membrane separation box and the pressure regulator is controlled to adjust the pressure inside the membrane separation box, including: Detecting the purity information of hydrogen in the third sampling machine box; According to the hydrogen purity information in the third sampling machine box, and when the hydrogen purity is less than 99%, the third control valve is controlled to open the third reflux pipeline.

10. A process device for treating formaldehyde tail gas, comprising a processor (1000) and a memory (1001) storing program instructions, characterized in that: The processor (1000) is configured to execute the control method for a process device for treating formaldehyde tail gas according to any one of claims 8 to 9 when running the program instructions.

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