CN114307587A - Formic acid process tail gas processing apparatus and formic acid process welding system - Google Patents
Formic acid process tail gas processing apparatus and formic acid process welding system Download PDFInfo
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- CN114307587A CN114307587A CN202210250072.6A CN202210250072A CN114307587A CN 114307587 A CN114307587 A CN 114307587A CN 202210250072 A CN202210250072 A CN 202210250072A CN 114307587 A CN114307587 A CN 114307587A
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Abstract
The invention provides a formic acid process tail gas treatment device and a formic acid process welding system, wherein the formic acid process tail gas treatment device comprises a filtering section and/or a heating decomposition section; the filtering section comprises a filtering section shell and a filtering medium, the filtering section shell is provided with a closed filtering cavity, the filtering medium is contained in the filtering cavity, and the filtering medium is suitable for adsorbing, dissolving and/or chemically decomposing formic acid; the heating decomposition section comprises a heating cavity shell and a heater, the heating cavity shell is provided with a sealed heating cavity, a heating part of the heater is hermetically arranged in the heating cavity, and the heater is used for heating and decomposing formic acid gas entering the heating cavity. The formic acid process tail gas treatment device and the formic acid process welding system can deeply purify the formic acid-containing gas according to the physical and chemical characteristics of formic acid, filter or decompose formic acid, can discharge the formic acid into the environment in a harmless form, cannot cause harmful influence on the environment, and realize the harmless treatment of the formic acid process tail gas.
Description
Technical Field
The invention relates to the technical field of welding processing, in particular to a formic acid process tail gas treatment device and a formic acid process welding system.
Background
Formic acid, commonly known as formic acid, is colorless and has pungent smell, volatile liquid, weak electrolyte, melting point of 8.6 ℃, boiling point of 100.8 ℃, strong acidity, corrosiveness and capability of stimulating skin to blister, and is an organic chemical raw material. Formic acid is a strong reducing agent, and formic acid gas can consume oxygen through chemical reaction at high temperature to form oxygen-free welding, and can reduce the oxidized metal surface through reduction reaction to form a clean metal surface. Therefore, in the semiconductor field and other welding and packaging fields, devices using formic acid technology are increasing as cleaning agents or reducing agents.
In the existing formic acid process, after the formic acid is used, a direct discharge mode is adopted, namely the formic acid is directly discharged into a pipeline and finally discharged into the air. Since formic acid is a strong acid, the formic acid can cause irritation symptoms of skin and mucosa, such as inflammation, ulcer and the like when contacting with a human body in the air; after contact, conjunctivitis, eyelid edema, rhinitis and bronchitis can be caused, and acute chemical pneumonia can be caused in serious cases. Therefore, formic acid is discharged into the air without being treated, and causes pollution to the air, which is extremely not responsible for the environment.
Disclosure of Invention
The invention provides a formic acid process tail gas treatment device and a formic acid process welding system, which are used for solving the defect that formic acid used in the formic acid process is directly discharged into the air without being treated in the prior art and realizing harmless treatment of formic acid process tail gas.
The invention provides a formic acid process tail gas treatment device, which comprises:
a filtration section, and/or a pyrolysis section;
the filter section comprises a filter section shell and a filter medium, the filter section shell is provided with a closed filter cavity, a filter inlet and a filter outlet which are communicated with the filter cavity, and the filter section shell is made of a formic acid corrosion resistant material; the filter medium is accommodated in the filter cavity and is suitable for adsorbing, dissolving and/or chemically decomposing formic acid;
the heating decomposition section comprises a heating cavity shell and a heater, the heating cavity shell is provided with a closed heating cavity, a heating inlet and a heating outlet which are communicated with the heating cavity, and the heating cavity shell is made of a formic acid corrosion resistant material; the heater is a formic acid corrosion resistant metal armored heater, a heating part of the heater is hermetically arranged in the heating cavity, and the heater is used for heating and decomposing formic acid gas entering the heating cavity;
the filtering inlet is used for being communicated with formic acid process equipment or the heating outlet, and the heating inlet is used for being communicated with the formic acid process equipment or the filtering outlet.
According to the formic acid process tail gas treatment device provided by the invention, the filter medium comprises one or more of a porous material filter element, a formic acid soluble solvent, concentrated sulfuric acid and a silver mirror solution.
According to the formic acid process tail gas treatment device provided by the invention, the heating decomposition section further comprises a baffle plate, the baffle plate is arranged in the heating cavity and is positioned between the heating inlet and the heating outlet, the baffle plate shields the cross section of the heating cavity, and the heating part of the heater is connected with the baffle plate.
According to the formic acid process tail gas treatment device provided by the invention, the baffle plates comprise a plurality of first baffle plates and a plurality of second baffle plates, the first baffle plates and the second baffle plates are alternately arranged at intervals along the direction from the heating inlet to the heating outlet, the first baffle plates are configured to enable airflow to flow through the cross section of the heating cavity from an edge position, and the second baffle plates are configured to enable airflow to flow through the cross section of the heating cavity from a middle position.
According to the formic acid process tail gas treatment device provided by the invention, the heating decomposition section further comprises a temperature detector, and the detection end of the temperature detector is hermetically arranged in the heating cavity and used for detecting the temperature in the heating cavity.
According to the formic acid process tail gas treatment device provided by the invention, the heating decomposition section further comprises a formic acid detector, and the formic acid detector is used for detecting the formic acid content in the gas discharged from the heating outlet.
According to the formic acid process tail gas treatment device provided by the invention, the heating decomposition section further comprises a heating decomposition section shell and a heat insulation layer, an installation cavity is formed in the heating decomposition section shell, and the heating cavity shell is installed in the installation cavity; the heat insulation layer is filled between the heating decomposition section shell and the heating cavity shell.
According to the formic acid process tail gas treatment device provided by the invention, the filtering section further comprises a first interface and a second interface, the first interface is connected to the filtering inlet, and the second interface is connected to the filtering outlet; the heating decomposition section further comprises a third interface and a fourth interface, the third interface is connected to the heating inlet, and the fourth interface is connected to the heating outlet; the first interface is suitable for being detachably and hermetically connected with formic acid process equipment and the fourth interface, and the third interface is suitable for being detachably and hermetically connected with the formic acid process equipment and the second interface.
According to the formic acid process tail gas treatment device provided by the invention, the formic acid process tail gas treatment device further comprises an exhaust section, the exhaust section comprises a fifth interface and an exhaust fan, the fifth interface is suitable for being detachably and hermetically connected with the second interface and the fourth interface, and the exhaust fan is used for providing suction force.
The invention also provides a formic acid process welding system, which comprises: formic acid technology welding equipment and the formic acid technology tail gas processing apparatus of any preceding item.
According to the formic acid process tail gas treatment device and the formic acid process welding system, the filtering section and/or the heating decomposition section are arranged, so that the formic acid-containing gas can be deeply purified according to the physical and chemical characteristics of formic acid, the formic acid is filtered or decomposed, and then the formic acid is discharged into the air in the form of carbon dioxide or hydrogen, and the decomposed carbon dioxide and hydrogen are few and can be discharged into the environment in a harmless form without causing harmful influence on the environment, so that the harmless treatment of the formic acid process tail gas is realized, and the defect that the formic acid used in the formic acid process in the prior art is directly discharged into the air without being treated is overcome; and formic acid technology tail gas processing apparatus can have the combination of multiple scheme, can multistage purification and realize the rapid treatment to containing formic acid gas, and abundant purification gets rid of formic acid, satisfies the in-service use demand, and convenient to use is nimble, reduces use cost.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a formic acid process tail gas treatment device according to an embodiment of the invention;
FIG. 2 is a schematic structural view of a filter segment according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of a pyrolysis section of an embodiment of the present invention;
fig. 4 is a schematic structural view of an exhaust section according to an embodiment of the present invention.
Reference numerals:
1: a filtration section; 2: a heating decomposition section; 3: an air exhaust section;
11: a filter segment housing; 12: a filter medium; 13: a first seal member; 14: a first interface; 15, a second interface;
21: a heating chamber housing; 22: a heater; 23: a second seal member; 24: a baffle plate; 25: a temperature detector; 26: a formic acid detector; 27: heating the decomposition section shell; 28: a thermal insulation layer; 29: a third interface; 20: a fourth interface;
31: a fifth interface; 32: an exhaust fan; 33: an air exhaust housing;
111: a filter chamber; 112: a filtration inlet; 113: a filtration outlet; 114: a filter housing body; 115: a filtering cover;
211: a heating cavity; 212: heating the inlet; 213: a heating outlet; 214: heating the shell main body; 215: heating the seal cover; 216: sealing the end cap;
241: a first baffle plate; 242: a second baffle.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the embodiments of the present invention, it should be noted that the terms "first", "second" and "third" are used for the sake of clarity in describing the numbering of the components of the product and do not represent any substantial difference, unless explicitly stated or limited otherwise. The directions of "up", "down", "inside" and "outside" are all based on the directions shown in the drawings. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.
It is to be understood that, unless otherwise expressly specified or limited, the term "coupled" is used broadly, and may, for example, refer to directly coupled devices or indirectly coupled devices through intervening media. Specific meanings of the above terms in the embodiments of the invention will be understood to those of ordinary skill in the art in specific cases.
The formic acid process tail gas treatment device of the invention is described below with reference to fig. 1 to 4. The dashed arrows in fig. 1 and 3 indicate the flow direction of the formic acid-containing gas.
As shown in fig. 1, the formic acid process tail gas treatment device provided by the embodiment of the invention comprises a filtering section 1 and/or a heating decomposition section 2.
As shown in fig. 2, the filter segment 1 comprises a filter segment casing 11 and a filter medium 12, the filter segment casing 11 has a closed filter cavity 111, and a filter inlet 112 and a filter outlet 113 which are communicated with the filter cavity 111, and the filter segment casing 11 is made of a formic acid corrosion resistant material; a filter medium 12 is received within filter cavity 111 between filter inlet 112 and filter outlet 113, filter medium 12 being adapted to adsorb, dissolve and/or chemically decompose formic acid.
As shown in fig. 3, the heating decomposition section 2 comprises a heating cavity housing 21 and a heater 22, the heating cavity housing 21 has a closed heating cavity 211, and a heating inlet 212 and a heating outlet 213 which are communicated with the heating cavity 211, and the heating cavity housing 21 is made of a formic acid corrosion resistant material; the heater 22 is a metal-clad heater resistant to formic acid corrosion, a heating part of the heater 22 is hermetically arranged in the heating cavity 211, and the heater 22 is used for heating and decomposing formic acid gas entering the heating cavity 211.
Wherein, the filtering inlet 112 of the filtering section 1 is used for being communicated with a heating outlet 213 of formic acid process equipment or the heating decomposition section 2, and the heating inlet 212 of the heating decomposition section 2 is used for being communicated with the filtering outlet 113 of the formic acid process equipment or the filtering section 1.
In this embodiment, the formic acid process tail gas treatment device can be separately provided with a filtering section 1, and the formic acid-containing gas discharged by the formic acid process equipment flows into the filtering cavity 111 through the filtering inlet 112 and flows out of the filtering cavity 111 through the filtering outlet 113 after flowing through the filtering medium 12; by utilizing the dissolution property and/or chemical decomposition property of formic acid, the filter medium 12 can adsorb, dissolve and/or chemically decompose incomplete formic acid in the flowing formic acid-containing gas, thereby realizing the filtration and purification of the formic acid-containing gas.
The formic acid process tail gas treatment device can also be separately provided with a heating decomposition section 2, and formic acid-containing gas exhausted by formic acid process equipment flows into the heating cavity 211 from a heating inlet 212 and flows out of the heating cavity 211 from a heating outlet 213 after flowing through the heater 22; the heating decomposition and purification of the formic acid-containing gas are realized by utilizing the characteristic that the formic acid is heated to above 160 ℃, namely, the formic acid is decomposed to release carbon dioxide and hydrogen, and the formic acid which is not completely used in the formic acid-containing gas is heated and decomposed in the heating cavity 211.
Formic acid technology tail gas processing apparatus can also be provided with filter segment 1 and thermal decomposition section 2 simultaneously, and filter segment 1 is not fixed with the position of thermal decomposition section 2, contains formic acid gas promptly and can pass through filter segment 1 earlier, passes through thermal decomposition section 2 again, also can pass through thermal decomposition section 2 earlier, passes through filter segment 1 again to the formic acid that will contain in the formic acid gas fully gets rid of totally combines for the purpose, realizes containing the quick processing of formic acid gas through multistage purification.
According to the formic acid process tail gas treatment device, the filtering section 1 and/or the heating decomposition section 2 are arranged, so that the formic acid-containing gas can be deeply purified according to the physical and chemical characteristics of formic acid, the formic acid is filtered or decomposed, and then the formic acid is discharged into the air in the form of carbon dioxide or hydrogen. And formic acid technology tail gas processing apparatus can have the combination of multiple scheme, can multistage purification and realize the rapid treatment to containing formic acid gas, and the abundant purification gets rid of formic acid, satisfies the in-service use demand, and convenient to use is nimble, reduces use cost, and the practicality is strong.
Specifically, as the container directly contacting with the formic acid-containing gas, the filtering section shell 11 and the heating cavity shell 21 are both integrally made of formic acid corrosion resistant materials, so that the service life is longer. The formic acid corrosion resistant material includes 316L stainless steel, perfluoro ether rubber, Polytetrafluoroethylene (PTFE) material, and the like.
Specifically, the filter medium 12 includes one or more of a porous material filter element, a readily soluble solvent for formic acid, concentrated sulfuric acid, and a silver mirror solution.
The filtering section 1 can adopt various filtering media 12, and can utilize the characteristic that formic acid is easy to dissolve and the characteristic that formic acid is chemically decomposed to ensure the filtering and purifying effects on formic acid. Wherein the porous material filter element can adsorb formic acid gas, such as activated carbon or sponge filter element; the formic acid can be freely mixed and dissolved with water, ethanol, ether, glycerol and other formic acid soluble solvents, so that the formic acid can be effectively dissolved; formic acid is dehydrated and decomposed into carbon monoxide and water under the catalytic action of concentrated sulfuric acid; the formic acid can react with the silver mirror to reduce the silver ions in the silver ammino ions into metallic silver, so that the formic acid can be oxidized and decomposed into carbon dioxide and water by the silver mirror solution.
Specifically, as shown in fig. 2, the filter segment housing 11 includes a filter housing main body 114 and a filter cover 115, the filter housing main body 114 and the filter cover 115 enclose a filter cavity 111, and the filter inlet 112 and the filter outlet 113 are respectively disposed on the filter housing main body 114 and the filter cover 115. The filter segment 1 further comprises a first seal 13, the first seal 13 being arranged between the filter housing body 114 and the filter cover 115.
Through setting up first sealing member 13 for seal the clearance between filter shell main part 114 and the filtration closing cap 115, effectively guarantee the leakproofness of filter chamber 111, prevent that the gas that contains formic acid that flows through filter segment 1 from leaking, guarantee the filter effect to formic acid.
Specifically, the first sealing element 13 is made of a formic acid corrosion resistant material, such as a perfluoro ether rubber sealing element, and has the advantages of formic acid corrosion resistance, good sealing effect and long service life.
Specifically, the filter shell main body 114 is a cavity shell with an opening at one end, a first sealing groove is arranged around the opening at the opening end of the filter shell main body 114, the first sealing element 13 is a sealing ring, and the sealing ring is installed in the first sealing groove; the filter cover 115 is fixedly installed at the open end of the filter housing main body 114, and closes the open end of the filter housing main body 114, and forms a sealed cavity with the filter housing main body 114 through a sealing ring installed in the first sealing groove.
Specifically, as shown in fig. 3, the heating chamber housing 21 includes a heating housing main body 214 and a heating cover 215, the heating housing main body 214 and the heating cover 215 are enclosed to form a heating chamber 211, and the heating inlet 212 and the heating outlet 213 are respectively disposed on the heating housing main body 214 and the heating cover 215. The pyrolysis section 2 further includes a second sealing member 23, and the second sealing member 23 is disposed between the heating shell main body 214 and the heating cover 215.
By providing the second sealing member 23 for sealing the gap between the heating casing main body 214 and the heating cover 215, the sealing property of the heating chamber 211 is effectively ensured, the formic acid-containing gas flowing through the heating decomposition section 2 is prevented from leaking, and the heating decomposition effect on formic acid is ensured.
Specifically, the second sealing element 23 is also made of a formic acid corrosion resistant material, such as a perfluoro ether rubber sealing element, which is capable of resisting formic acid corrosion, and has a good sealing effect and a long service life.
Specifically, the heating shell main body 214 is a cavity shell with an opening at one end, a second sealing groove is formed around the opening at the opening end of the heating shell main body 214, the second sealing element 23 is a sealing ring, and the sealing ring is installed in the second sealing groove; the heating cover 215 is fixed to the open end of the heating case main body 214 by bolts, and closes the open end of the heating case main body 214, and forms a sealed cavity with the heating case main body 214 by a seal ring in the second seal groove.
Specifically, the heater 22 is a metal-clad heater resistant to corrosion of formic acid and high temperature, a first mounting hole is formed in the heating cover 215, and a heating portion of the heater 22 is inserted into the heating cavity 211 through the first mounting hole. The heating chamber housing 21 further comprises a sealing end cover 216, and the sealing end cover 216 is fixedly connected with the heating cover 215 in a sealing manner so as to seal the heating portion of the heater 22 in the heating chamber 211.
Further, as shown in fig. 3, the heating decomposition segment 2 further comprises a baffle plate 24, the baffle plate 24 is disposed in the heating cavity 211 and located between the heating inlet 212 and the heating outlet 213, and the baffle plate 24 shields a part of the cross section of the heating cavity 211.
In this embodiment, by disposing the baffle plate 24 in the heating cavity 211, and the baffle plate 24 shields a cross section of the heating cavity 211, the baffle plate 24 can shield a flow path of an air flow from the heating inlet 212 to the heating outlet 213, so that the air flow entering the heating cavity 211 from the heating inlet 212 must bypass the baffle plate 24 to flow to the heating outlet 213, and the flow path of the formic acid-containing gas in the heating cavity 211 is increased, thereby prolonging the retention time of the formic acid-containing gas in the heating cavity 211, facilitating the sufficient thermal decomposition of formic acid, and achieving a better thermal decomposition effect; the baffle plate 24 serves as an air flow guide, and the baffle plate 24 and the heating chamber housing 21 define a flow passage for the air flow in the heating chamber 211.
In particular, the baffle 24 comprises a first baffle 241 and a second baffle 242, the first baffle 241 and the second baffle 242 being spaced apart in the direction from the heating inlet 212 to the heating outlet 213, the first baffle 241 being configured to cause the airflow to flow from an edge location through the cross-section of the heating chamber 211, the second baffle 242 being configured to cause the airflow to flow from an intermediate location through the cross-section of the heating chamber 211.
In this embodiment, the first baffle 241 can guide the airflow in the heating cavity 211 to an edge position close to the inner wall of the heating cavity 211, and then flow through the first baffle 241; the second baffle 242 can direct the airflow in the heating chamber 211 to an intermediate position in the heating chamber 211 and then through the second baffle 242; through the first baffle 241 and the second baffle 242 that set gradually, can form the tortuous flow path through heating chamber 211 border position and intermediate position in heating chamber 211, can further increase the flow path that contains formic acid gas in heating chamber 211, prolonged the dwell time that contains formic acid gas in heating chamber 211, formic acid is heated to decompose more fully, heats the decomposition effect better.
In one embodiment, the outer diameter of the first baffle 241 is smaller than the inner diameter of the heating chamber 211, and a flow passage through which the air flow passes is formed between the outer edge of the first baffle 241 and the inner wall of the heating chamber 211, so that the air flow passes through the cross section of the heating chamber 211 where the first baffle 241 is located from the edge position. The outer diameter of the second baffle 242 is the same as the inner diameter of the heating cavity 211, and a filtering channel through which air flows is arranged at the middle position of the second baffle 242, for example, at least one overflowing hole is arranged at the center of the second baffle 242 or the second baffle 242 is in a circular ring shape; the outer edge of the second baffle 242 is connected to the inner wall of the heating chamber 211 to allow airflow from an intermediate location through the cross-section of the heating chamber 211 in which the second baffle 242 is located.
Further, the first barrier 241 and the second barrier 242 are plural, and the plural first barriers 241 and the plural second barriers 242 are alternately arranged at intervals in the direction from the heating inlet 212 to the heating outlet 213.
In the present embodiment, the alternate arrangement means that along the direction from the heating inlet 212 to the heating outlet 213, a first baffle 241 is first disposed, then a second baffle 242 is disposed at an interval, then a first baffle 241 is disposed at an interval, then a second baffle 242 is disposed at an interval, and so on; through the plurality of first baffles 241 and the plurality of second baffles 242 which are alternately arranged at intervals, the bent flow channel which passes through the edge position and the middle position of the heating cavity 211 repeatedly and repeatedly can be formed in the heating cavity 211, so that the flow path of the formic acid-containing gas in the heating cavity 211 is further increased, the retention time of the formic acid-containing gas in the heating cavity 211 is further prolonged, the formic acid is more fully heated and decomposed, and the heating and decomposing effect is better.
Furthermore, the baffle plate 24 is provided with a through hole, and the heating portion of the heater 22 is inserted into the through hole and connected to the baffle plate 24.
In the present embodiment, the through hole is provided for penetrating the heating portion of the heater 22, the baffle plate 24 is fixed at the heating portion of the heater 22, the baffle plate 24 expands the heating area of the gas in the heating chamber 211 by heat generated by the heat conduction diffusion heater 22, and the formic acid-containing gas is heated when flowing through the baffle plate 24, thereby sufficiently and effectively decomposing the formic acid-containing gas, and improving the heating and decomposing efficiency.
Specifically, the baffle 24 is made of a material having good thermal conductivity and resistance to formic acid corrosion, such as 316L stainless steel.
Further, as shown in fig. 3, the heating decomposition section 2 further comprises a temperature detector 25, and a detection end of the temperature detector 25 is hermetically disposed in the heating cavity 211 for detecting the temperature in the heating cavity 211.
In this embodiment, the temperature detector 25 is arranged to detect the temperature in the heating chamber 211, and the heating temperature of the heater 22 in the heating chamber 211 can be accurately controlled according to the detected temperature fed back by the temperature detector 25, so that the heating decomposition effect of formic acid is improved.
Specifically, the heating cover 215 is further provided with a second mounting hole, the detection end of the temperature detector 25 is inserted into the heating cavity 211 through the second mounting hole, and the sealing end cover 216 further seals the detection end of the temperature detector 25 in the heating cavity 211.
In one particular embodiment, the temperature detector 25 includes a temperature sensor. The heating temperature of the heater 22 is 160 ℃ to 180 ℃.
Further, as shown in fig. 3, the pyrolysis section 2 further includes a formic acid detector 26, and the formic acid detector 26 is installed at a position close to the heating outlet 213 for detecting the formic acid content in the gas discharged from the heating outlet 213.
In this embodiment, through setting up formic acid detector 26, can detect whether contain formic acid in the gas that heating decomposition section 2 flows out, if contain formic acid, accessible temperature sensor controls heater 22 and promotes the temperature for the heating decomposition speed of formic acid, guarantees that the formic acid in the formic acid containing gas fully decomposes, improves the heating decomposition effect.
In one particular embodiment, the formic acid detector 26 includes a formic acid detection probe.
Furthermore, the heating decomposition section 2 further comprises a return pipeline and a control valve, wherein two ends of the return pipeline are respectively communicated with the heating outlet 213 and the heating inlet 212; the control valve is used for controlling the conduction of the heating outlet 213 and the return pipeline or the exhaust interface.
In this embodiment, when the formic acid detector 26 detects that the gas flowing out of the thermal decomposition section 2 contains formic acid, the control valve controls the conduction between the heating outlet 213 and the return pipeline, and introduces the gas flowing out of the heating outlet 213 into the heating inlet 212, so that the formic acid remaining in the mixed gas is thermally decomposed again; until the formic acid detector 26 detects that the formic acid in the gas flowing out from the heating decomposition section 2 is completely decomposed, the control valve controls the conduction of the heating outlet 213 and the exhaust interface, and the gas without formic acid is exhausted. Thereby effectively ensuring the purification and the removal of the formic acid and realizing the harmless treatment of the formic acid process tail gas.
Further, as shown in fig. 3, the pyrolysis section 2 further includes a pyrolysis section outer shell 27 and a heat insulation layer 28, the pyrolysis section outer shell 27 has an installation cavity therein, and the heating cavity housing 21 is installed in the installation cavity; the insulation layer 28 is filled between the pyrolysis section casing 27 and the heating chamber housing 21.
In this embodiment, the pyrolysis section housing 27 is disposed at the outermost layer of the pyrolysis section 2, and mainly serves as a fixed support and protection, and the internal installation chamber is used for installing the heating cavity housing 21 and the heat insulation layer 28. The heat insulation layer 28 is made of a material with an extremely low heat conduction rate, such as heat insulation cotton, refractory bricks and the like, and can be used for blocking heat transfer between the heating cavity shell 21 and the heating decomposition section shell 27, so that the situation that the temperature of the heating decomposition section shell 27 is too high and is dangerous to operators due to the fact that the temperature of the heating cavity shell 21 is too high is prevented, and potential safety hazards are eliminated.
Further, as shown in fig. 2, the filter segment 1 further comprises a first connector 14 and a second connector 15, wherein the first connector 14 is connected to the filter inlet 112, and the second connector 15 is connected to the filter outlet 113. As shown in fig. 3, the pyrolysis section 2 further comprises a third port 29 and a fourth port 20, wherein the third port 29 is connected to the heating inlet 212, and the fourth port 20 is connected to the heating outlet 213. Wherein the first port 14 is adapted to be detachably and hermetically connected with formic acid processing equipment and the fourth port 20, and the third port 29 is adapted to be detachably and hermetically connected with formic acid processing equipment and the second port 15.
In the embodiment, by arranging the first interface 14, the second interface 15, the third interface 29 and the fourth interface 20, the filtering section 1 and the heating decomposition section 2 can be detachably matched with formic acid process equipment and can also be detachably matched with each other; the filtering section 1 and the heating decomposition section 2 can be respectively and independently arranged and can also be combined and arranged, the positions are not fixed, the filtering section and the heating decomposition section can be flexibly arranged according to actual needs, formic acid is fully decomposed and randomly combined for the purpose, formic acid is rapidly decomposed through multi-stage purification, the heating decomposition effect of formic acid is ensured, and the use cost is reduced.
In the present embodiment, the fourth port 20 is an exhaust port.
Furthermore, as shown in fig. 1, the formic acid process tail gas treatment device further comprises an exhaust section 3. As shown in fig. 4, the exhaust section 3 comprises a fifth interface 31 and an exhaust fan 32, the fifth interface 31 is suitable for being detachably and hermetically connected with the second interface 15 and the fourth interface 20, and the exhaust fan 32 is used for providing suction force.
In the embodiment, the exhaust section 3 can be connected with the filtering section 1 and/or the heating decomposition section 2 through the fifth interface 31 to form a combined body; the exhaust fan 32 is operated to provide a suction force to draw the formic acid-containing gas out of the formic acid processing apparatus, and the formic acid-containing gas flows through the filtering section 1 and/or the pyrolysis section 2 and the fifth connection 31 in order, and is finally exhausted by the exhaust fan 32.
Wherein, according to the needs, the filtering section 1 and the heating decomposition section 2 can be respectively and independently combined with the air exhaust section 3 to form a combination, or the filtering section 1, the heating decomposition section 2 and the air exhaust section 3 can be jointly combined to form a combination. For example, the waste gas can firstly pass through the heating decomposition section 2, then pass through the filtering section 1 and then pass through the exhaust section 3; or firstly passes through the filtering section 1, then passes through the heating decomposition section 2 and then passes through the air exhaust section 3; or only pass through the filtering section 1 and the air exhaust section 3; it is also possible to pass through only the pyrolysis section 2 and the exhaust section 3.
Specifically, the exhaust fan 32 is a variable frequency exhaust fan, and the exhaust size can be adjusted according to the size of the front-end formic acid process equipment, the filter section 1 and/or the pyrolysis section 2 and the technical process requirements.
Specifically, the exhaust section 3 further includes an exhaust casing 33, the exhaust casing 33 has an expanded air duct in a horn shape, the fifth interface 31 is connected to a small opening end of the expanded air duct, and the exhaust fan 32 is installed at a large opening end of the expanded air duct.
Specifically, the first interface 14, the second interface 15, the third interface 29, the fourth interface 20 and the fifth interface 31 are quick-connection interfaces, so that the quick-assembly, disassembly and replacement are convenient, and the use is convenient and flexible.
In one embodiment, the work flow of the formic acid process tail gas treatment device comprises the following steps: firstly, the filtering section 1 is connected with formic acid processing equipment through a first connector 14, a third connector 29 of the heating decomposition section 2 is connected with a second connector 15 of the filtering section 1, and a fifth connector 31 of the exhaust section 3 is connected with a fourth connector 20 of the heating decomposition section 2. Then, the exhaust fan 32 of the exhaust section 3 operates to suck the formic acid-containing gas from the formic acid process equipment to the filter section 1 through the first port 14, and the gas is preliminarily filtered by the filter section 1. Then, the tail gas of the filtering section 1 is sucked into the heating cavity 211 of the heating decomposition section 2, and the formic acid is decomposed in a heating mode and finally decomposed into hydrogen and carbon dioxide; the formic acid detector 26 arranged at the position of the heating outlet 213 of the heating decomposition section 2 is used for detecting the formic acid content in the gas discharged from the heating decomposition section 2, if the formic acid content exceeds the standard, the temperature detector 25 can control the heater 22 to raise the temperature in the heating cavity 211, and the formic acid in the gas is discharged after being sufficiently decomposed.
The embodiment of the invention also provides a formic acid process welding system which comprises formic acid process welding equipment and the formic acid process tail gas treatment device provided by any one of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A formic acid technology tail gas processing apparatus, characterized by, includes:
a filtration section, and/or a pyrolysis section;
the filter section comprises a filter section shell and a filter medium, the filter section shell is provided with a closed filter cavity, a filter inlet and a filter outlet which are communicated with the filter cavity, and the filter section shell is made of a formic acid corrosion resistant material; the filter medium is accommodated in the filter cavity and is suitable for adsorbing, dissolving and/or chemically decomposing formic acid;
the heating decomposition section comprises a heating cavity shell and a heater, the heating cavity shell is provided with a closed heating cavity, a heating inlet and a heating outlet which are communicated with the heating cavity, and the heating cavity shell is made of a formic acid corrosion resistant material; the heater is a formic acid corrosion resistant metal armored heater, a heating part of the heater is hermetically arranged in the heating cavity, and the heater is used for heating and decomposing formic acid gas entering the heating cavity;
the filtering inlet is used for being communicated with formic acid process equipment or the heating outlet, and the heating inlet is used for being communicated with the formic acid process equipment or the filtering outlet.
2. The formic acid process tail gas treatment device according to claim 1, wherein the filter medium comprises one or more of a porous material filter element, a formic acid soluble solvent, concentrated sulfuric acid, and a silver mirror solution.
3. The formic acid process tail gas treatment device according to claim 1, wherein the heating decomposition section further comprises a baffle plate, the baffle plate is arranged in the heating cavity and located between the heating inlet and the heating outlet, the baffle plate shields a part of the cross section of the heating cavity, and the heating part of the heater is connected with the baffle plate.
4. The formic acid process tail gas treatment device according to claim 3, wherein the baffle plate comprises a plurality of first baffle plates and a plurality of second baffle plates, the plurality of first baffle plates and the plurality of second baffle plates are alternately arranged at intervals along the direction from the heating inlet to the heating outlet, the first baffle plates are configured to enable the gas flow to flow through the cross section of the heating cavity from an edge position, and the second baffle plates are configured to enable the gas flow to flow through the cross section of the heating cavity from an intermediate position.
5. The formic acid process tail gas treatment device according to claim 1, wherein the heating decomposition section further comprises a temperature detector, and a detection end of the temperature detector is hermetically arranged in the heating cavity and used for detecting the temperature in the heating cavity.
6. The formic acid process tail gas treatment device according to claim 1, wherein the thermal decomposition section further comprises a formic acid detector for detecting the formic acid content in the gas discharged from the heating outlet.
7. The formic acid process tail gas treatment device according to claim 1, wherein the thermal decomposition section further comprises a thermal decomposition section housing and a thermal insulation layer, the thermal decomposition section housing is internally provided with an installation chamber, and the heating chamber housing is installed in the installation chamber; the heat insulation layer is filled between the heating decomposition section shell and the heating cavity shell.
8. The formic acid process tail gas treatment device according to claim 1, wherein the filter section further comprises a first connector and a second connector, the first connector is connected to the filter inlet, and the second connector is connected to the filter outlet; the heating decomposition section further comprises a third interface and a fourth interface, the third interface is connected to the heating inlet, and the fourth interface is connected to the heating outlet; the first interface is suitable for being detachably and hermetically connected with formic acid process equipment and the fourth interface, and the third interface is suitable for being detachably and hermetically connected with the formic acid process equipment and the second interface.
9. The formic acid process tail gas treatment device according to claim 8, further comprising an exhaust section, wherein the exhaust section comprises a fifth interface and an exhaust fan, the fifth interface is adapted to be detachably and hermetically connected with the second interface and the fourth interface, and the exhaust fan is used for providing a suction force.
10. A formic acid process welding system, comprising: formic acid process welding equipment and a formic acid process tail gas treatment device as defined in any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210250072.6A CN114307587A (en) | 2022-03-15 | 2022-03-15 | Formic acid process tail gas processing apparatus and formic acid process welding system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210250072.6A CN114307587A (en) | 2022-03-15 | 2022-03-15 | Formic acid process tail gas processing apparatus and formic acid process welding system |
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| CN114307587A true CN114307587A (en) | 2022-04-12 |
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| CN202210250072.6A Pending CN114307587A (en) | 2022-03-15 | 2022-03-15 | Formic acid process tail gas processing apparatus and formic acid process welding system |
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