CN113477279A - Waste heat utilization method and device in denitration catalyst regeneration process - Google Patents
Waste heat utilization method and device in denitration catalyst regeneration process Download PDFInfo
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- CN113477279A CN113477279A CN202110848333.XA CN202110848333A CN113477279A CN 113477279 A CN113477279 A CN 113477279A CN 202110848333 A CN202110848333 A CN 202110848333A CN 113477279 A CN113477279 A CN 113477279A
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- 239000003054 catalyst Substances 0.000 title claims abstract description 104
- 238000000034 method Methods 0.000 title claims abstract description 61
- 230000008929 regeneration Effects 0.000 title claims abstract description 27
- 238000011069 regeneration method Methods 0.000 title claims abstract description 27
- 239000002918 waste heat Substances 0.000 title claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 108
- 238000004140 cleaning Methods 0.000 claims abstract description 93
- 238000010438 heat treatment Methods 0.000 claims abstract description 83
- 239000002699 waste material Substances 0.000 claims abstract description 39
- 239000002912 waste gas Substances 0.000 claims abstract description 25
- 238000001035 drying Methods 0.000 claims abstract description 19
- 239000007789 gas Substances 0.000 claims abstract description 17
- 239000003814 drug Substances 0.000 claims abstract description 4
- 239000000243 solution Substances 0.000 claims description 57
- 238000007599 discharging Methods 0.000 claims description 26
- 239000012774 insulation material Substances 0.000 claims description 6
- 230000001502 supplementing effect Effects 0.000 claims description 5
- 239000011550 stock solution Substances 0.000 claims description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 231100000572 poisoning Toxicity 0.000 description 3
- 230000000607 poisoning effect Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J38/00—Regeneration or reactivation of catalysts, in general
- B01J38/48—Liquid treating or treating in liquid phase, e.g. dissolved or suspended
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J38/00—Regeneration or reactivation of catalysts, in general
- B01J38/02—Heat treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J38/00—Regeneration or reactivation of catalysts, in general
- B01J38/04—Gas or vapour treating; Treating by using liquids vaporisable upon contacting spent catalyst
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- Materials Engineering (AREA)
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention relates to a method for utilizing waste heat in a denitration catalyst regeneration process, which comprises the following steps: cleaning a catalyst to be regenerated by using a cleaning solution at the temperature of 60-70 ℃, introducing the waste liquid after the catalyst is cleaned into a first heat exchanger, collecting the heat of the waste liquid introduced into the first heat exchanger, and heating the solution stored in a liquid storage part; heating and drying the cleaned catalyst by using gas at the temperature of 200-400 ℃, introducing the waste gas after the catalyst is heated and dried into a second heat exchanger, collecting the heat of the waste gas introduced into the second heat exchanger, and heating the solution stored in the liquid storage part; adding a medicament to the heated solution to form a new cleaning solution. The invention can prevent waste of heat by effectively utilizing the waste heat generated in the catalyst regeneration process, does not need auxiliary heating in the catalyst cleaning process, achieves the purpose of saving energy, saves cost, can slowly cool the catalyst after heating and drying, and prevents the mechanical strength of the regenerated catalyst from being poor.
Description
Technical Field
The invention belongs to the technical field of catalyst regeneration, and particularly relates to a method and a device for utilizing waste heat in a denitration catalyst regeneration process.
Background
At present, most power station boiler equipment is equipped with SCR denitrification facility for get rid of the nitrogen oxide in the boiler tail gas. The SCR denitration device plays an important role in the SCR catalyst, but in the long-time operation of the boiler, the catalyst can generate phenomena of gradual ash accumulation and poisoning, so that the denitration performance of the boiler is gradually reduced, and the operation of the whole unit can be seriously failed. The ash deposits on the catalyst and the poisoning substances adsorbed by the catalyst can be cleaned by an SCR catalyst regeneration technology, so that the denitration performance of the catalyst can be recovered.
The existing catalyst regeneration technology mainly comprises a wet cleaning process and a drying roasting process, wherein ash deposits and adsorbed poisoning substances on a catalyst are cleaned by the wet cleaning process, and active substances are loaded on the catalyst again, but in the wet cleaning process, a large amount of moisture is adsorbed by the catalyst, and the moisture in the catalyst needs to be evaporated by the drying roasting process to recover the mechanical strength of the catalyst, wherein the drying roasting process is to heat the catalyst to 200-400 ℃ in a furnace, then keep the temperature for a certain time, and finally cool the catalyst. However, in the process of cooling the catalyst, a slow cooling mode needs to be adopted, if the dried catalyst in the furnace is directly placed in a normal temperature environment for cooling, the temperature of the catalyst is rapidly reduced due to a huge temperature difference, and meanwhile, due to the action of internal stress, the catalyst can generate cracks and even break, so that the mechanical strength of the regenerated catalyst is poor.
In addition, when wasing the pond and changing water and when the catalyst is dry after the cooling, can produce a large amount of heats, and do not utilize these heats at present, heat can be wasted usually, if can utilize these heats, can reach the energy saving, and then the effect of cost-effective, consequently to the waste heat that denitration catalyst regeneration process produced at present, the urgent need develop a reasonable utilization method.
Disclosure of Invention
The invention aims to provide a method for utilizing waste heat in a denitration catalyst regeneration process, which is used for solving the problem of waste heat waste in the catalyst regeneration process.
In order to achieve the purpose, the invention adopts the technical scheme that:
a waste heat utilization method in a denitration catalyst regeneration process comprises the following steps:
s10: cleaning a catalyst to be regenerated by using a cleaning solution at the temperature of 60-70 ℃, introducing the waste liquid after the catalyst is cleaned into a first heat exchanger, collecting the heat of the waste liquid introduced into the first heat exchanger, and heating the solution stored in a liquid storage part;
s11: heating and drying the cleaned catalyst by using gas at the temperature of 200-400 ℃, introducing the waste gas after the catalyst is heated and dried into a second heat exchanger, collecting the heat of the waste gas introduced into the second heat exchanger, and heating the solution stored in the liquid storage part;
s2: adding medicament into the solution heated by S10 and S11 to form new cleaning solution.
Preferably, in S10 and S11, the temperature of the waste liquid is 60-70 ℃, the temperature of the waste gas is 200-400 ℃, and the solution stored in the liquid storage part is heated to 70-95 ℃. That is, the temperature of the catalyst is always kept constant during the process of cleaning the catalyst by the cleaning liquid and drying the catalyst by the gas.
Preferably, in S10, after the set amount of the catalyst is cleaned, the waste liquid is introduced into the first heat exchanger.
The invention also aims to provide a device for realizing the method for utilizing the waste heat in the regeneration process of the denitration catalyst.
In order to achieve the purpose, the invention adopts the technical scheme that:
the device comprises a cleaning component and a heating component, wherein the cleaning component is used for cleaning a catalyst to be regenerated, the heating component is used for heating and drying the cleaned catalyst, the device further comprises a first heat exchanger, a second heat exchanger, a liquid storage component and a valve component, a space for placing the catalyst to be regenerated is formed inside the cleaning component, the cleaning component is provided with a first outlet and a first inlet, the first outlet of the cleaning component is used for discharging waste liquid after the catalyst is cleaned, the first inlet of the cleaning component is used for introducing the waste liquid after the heat exchange in the first heat exchanger, a space for placing the cleaned catalyst is formed inside the heating component, and the heating component is provided with a first outlet, a second inlet and a valve component, The waste gas after the catalyst is heated and dried is discharged from a first outlet of the heating component, the waste gas after the catalyst is heated and dried is introduced into a first inlet of the heating component, the waste gas after the catalyst is subjected to heat exchange in a second heat exchanger, the first heat exchanger is provided with a first heat exchange cavity and a second heat exchange cavity, the first heat exchange cavity is provided with an inlet and an outlet, the inlet of the first heat exchange cavity is used for introducing waste liquid after the catalyst is cleaned, the outlet of the first heat exchange cavity is used for discharging waste liquid after the catalyst is subjected to heat exchange in the first heat exchanger, the second heat exchange cavity is provided with an inlet and an outlet, the inlet of the second heat exchange cavity is used for introducing a solution to be heated, the outlet of the second heat exchange cavity is used for discharging a heated solution, the second heat exchanger is provided with a third heat exchange cavity and a fourth heat exchange cavity, and the third heat exchange cavity is provided with an inlet and a second heat exchange cavity, An outlet, an inlet of the third heat exchange cavity is used for introducing exhaust gas after heating and drying the catalyst, an outlet of the third heat exchange cavity is used for discharging the exhaust gas after heat exchange in the second heat exchanger, the fourth heat exchange cavity is provided with an inlet and an outlet, an inlet of the fourth heat exchange cavity is used for introducing a solution to be heated, an outlet of the fourth heat exchange cavity is used for discharging the heated solution, the liquid storage component is provided with a first inlet and a first outlet, the first inlet of the liquid storage component is used for introducing the heated solution, the first outlet of the liquid storage component is used for discharging the solution to be heated, the first outlet of the cleaning component is communicated with the inlet of the first heat exchange cavity, the outlet of the first heat exchange cavity is communicated with the first inlet of the cleaning component, and the outlet of the second heat exchange cavity is communicated with the first inlet of the liquid storage component, the first outlet of the liquid storage component is communicated with the inlet of the second heat exchange cavity, the first outlet of the heating component is communicated with the inlet of the third heat exchange cavity, the outlet of the third heat exchange cavity is communicated with the first inlet of the heating component, the outlet of the fourth heat exchange cavity is communicated with the first inlet of the liquid storage component, the first outlet of the liquid storage component is communicated with the inlet of the fourth heat exchange cavity, the outlet of the second heat exchange cavity is communicated with the inlet of the fourth heat exchange cavity, and the valve component is arranged on a connecting pipeline between the components and used for controlling the connection and disconnection of the connecting pipeline.
Preferably, the device further comprises a pump assembly, the pump assembly comprises a first circulating pump and a second circulating pump, an outlet of the second heat exchange cavity and an outlet of the fourth heat exchange cavity are communicated with an inlet of the first circulating pump, an outlet of the first circulating pump is communicated with a first inlet of the liquid storage part, and the second circulating pump is arranged on a connecting pipeline between a first outlet of the cleaning part and an inlet of the first heat exchange cavity.
Preferably, the device still include the draught fan, the draught fan set up the heating member first export with the third heat transfer chamber the entry between on the connecting pipeline.
Preferably, the liquid storage part further has a second outlet, the cleaning part further has a second inlet, the second outlet of the liquid storage part is communicated with the second inlet of the cleaning part, and the second outlet of the liquid storage part is used for discharging the heated solution to the cleaning part.
Preferably, the liquid storage part is also provided with a second inlet, and the second inlet of the liquid storage part is used for supplementing the solution to be heated to the interior of the liquid storage part.
Preferably, the cleaning component is further provided with a second outlet, and the second outlet of the cleaning component is used for discharging waste liquid after heat exchange.
Preferably, the heating part is further provided with a second inlet, and the second inlet of the heating part is used for supplementing gas with the temperature of 200-400 ℃.
Preferably, heat insulation materials are arranged outside the heating part, the liquid storage part and the cleaning part; and the outside of the connecting pipeline among the heating part, the first heat exchanger, the second heat exchanger, the liquid storage part and the cleaning part is wrapped with a heat insulation material.
Preferably, the device further comprises a PLC controller for controlling an operation process of the device.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
the invention can prevent waste of heat by effectively utilizing the waste heat generated in the catalyst regeneration process, does not need auxiliary heating in the catalyst cleaning process, achieves the purpose of saving energy, improves the economy, saves the cost, can slowly cool the catalyst after heating and drying, and prevents the mechanical strength of the regenerated catalyst from being poor.
Drawings
Fig. 1 is a schematic structural diagram of the device according to the embodiment.
In the above drawings: 1. cleaning the component; 11. a first outlet of the cleaning component; 12. a first inlet of the cleaning member; 13. a second outlet of the cleaning component; 14. a second inlet of the cleaning member; 2. a heating member; 21. a first outlet of the heating member; 22. a first inlet of the heating member; 23. a second inlet of the heating member; 3. a first heat exchanger; 31. an inlet of the first heat exchange chamber; 32. an outlet of the first heat exchange chamber; 33. an inlet of the second heat exchange chamber; 34. an outlet of the second heat exchange chamber; 4. a second heat exchanger; 41. an inlet of the third heat exchange chamber; 42. an outlet of the third heat exchange chamber; 43. an inlet of the fourth heat exchange chamber; 44. an outlet of the fourth heat exchange chamber; 5. a liquid storage part; 51. a first inlet of the reservoir component; 52. a first outlet of the reservoir component; 53. a second inlet of the reservoir component; 54. a second outlet of the reservoir component; 6. a pump assembly; 61. a first circulation pump; 62. a second circulation pump; 7. an induced draft fan; 8. connecting a pipeline; 80. a first connecting line; 81. a second connecting line; 82. a third connecting pipeline; 83. a fourth connecting pipeline; 84. a fifth connecting pipeline; 85. a sixth connecting line; 86. a seventh connecting line; 87. an eighth connecting pipeline; 88. a ninth connecting line; 89. a tenth connecting line; 10. a valve assembly; 101. a first control valve; 102. a second control valve; 103. a third control valve; 104. a fourth control valve; 105. a fifth control valve; 106. a sixth control valve; 107. a seventh control valve; 108. an eighth control valve; 109. a ninth control valve; 110. a tenth control valve; 111. an eleventh control valve; 112. a twelfth control valve; 113. a thirteenth control valve; 114. a fourteenth control valve.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood 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 present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
A waste heat utilization method in a denitration catalyst regeneration process comprises the following steps:
s10: cleaning the catalyst to be regenerated by using a cleaning solution at the temperature of 60-70 ℃, keeping the temperature of the waste liquid at 60-70 ℃ after cleaning the catalyst with a set amount, introducing the waste liquid into a first heat exchanger, collecting the heat of the waste liquid introduced into the first heat exchanger, and heating the solution stored in the liquid storage part;
s11: heating and drying the cleaned catalyst by using gas at the temperature of 200-400 ℃, keeping the temperature of the waste gas at 200-400 ℃ after the catalyst is heated and dried, introducing the waste gas into a second heat exchanger, collecting the heat of the waste gas introduced into the second heat exchanger, and heating the solution stored in the liquid storage part, wherein the solution can be heated to 70-95 ℃;
s2: adding medicament into the solution heated by S10 and S11 to form new cleaning solution.
The following specifically introduces a device for realizing the waste heat utilization method in the denitration catalyst regeneration process, which specifically comprises the following steps:
as shown in fig. 1, a device for realizing a method for utilizing waste heat in a denitration catalyst regeneration process includes a cleaning component 1, a heating component 2, a first heat exchanger 3, a second heat exchanger 4, a liquid storage component 5, a pump component 6, an induced draft fan 7 and a valve component 10, wherein:
the cleaning component 1 is used for cleaning a catalyst to be regenerated, a space for placing the catalyst to be regenerated is formed inside the cleaning component, the cleaning component 1 is provided with a first outlet, a first inlet, a second outlet and a second inlet, the first outlet 11 of the cleaning component is used for discharging waste liquid after the catalyst is cleaned, the first inlet 12 of the cleaning component is used for introducing the waste liquid after heat exchange in the first heat exchanger 3, the second outlet 13 of the cleaning component is used for discharging the waste liquid after heat exchange, and the second inlet 14 of the cleaning component is used for introducing heated solution.
The heating part 2 is used for heating and drying the cleaned catalyst, a space for placing the cleaned catalyst is formed inside the heating part 2, the heating part 2 is provided with a first outlet, a first inlet and a second inlet, the first outlet 21 of the heating part is used for discharging the exhaust gas after the catalyst is heated and dried, the first inlet 22 of the heating part is used for introducing the exhaust gas after heat exchange in the second heat exchanger 4, and the second inlet 23 of the heating part is used for supplementing high-temperature gas of 200-400 ℃ into the heating part.
The first heat exchanger 3 is used for collecting heat in waste liquid, the first heat exchanger 3 is provided with a first heat exchange cavity and a second heat exchange cavity, the first heat exchange cavity is provided with an inlet and an outlet, the inlet 31 of the first heat exchange cavity is used for introducing the waste liquid after the catalyst is cleaned, the outlet 32 of the first heat exchange cavity is used for discharging the waste liquid after heat exchange in the first heat exchanger 3, the second heat exchange cavity is provided with an inlet and an outlet, the inlet 33 of the second heat exchange cavity is used for introducing a solution to be heated, and the outlet 34 of the second heat exchange cavity is used for discharging the heated solution.
The second heat exchanger 4 is used for collecting heat in waste gas, the second heat exchanger 4 is provided with a third heat exchange cavity and a fourth heat exchange cavity, the third heat exchange cavity is provided with an inlet and an outlet, the inlet 41 of the third heat exchange cavity is used for introducing the waste gas after the catalyst is heated and dried, the outlet 42 of the third heat exchange cavity is used for discharging the waste gas after heat exchange in the second heat exchanger 4, the fourth heat exchange cavity is provided with an inlet and an outlet, the inlet 43 of the fourth heat exchange cavity is used for introducing a solution to be heated, and the outlet 44 of the fourth heat exchange cavity is used for discharging the heated solution.
The liquid storage part 5 stores a solution, the liquid storage part 5 has a first inlet 51 for introducing the heated solution, a first outlet 52 for discharging the solution to be heated, a second inlet 53 for supplying the solution to be heated, and a second outlet 54 for discharging the heated solution to the cleaning part 1.
the first outlet 11 of the cleaning component is communicated with the inlet 31 of the first heat exchange cavity, and the outlet 32 of the first heat exchange cavity is communicated with the first inlet 12 of the cleaning component, so that a passage is formed between the cleaning component 1 and the first heat exchanger 3; the first outlet 21 of the heating member is communicated with the inlet 41 of the third heat exchange cavity, and the outlet 42 of the third heat exchange cavity is communicated with the first inlet 22 of the heating member, so that a passage is formed between the heating member 2 and the second heat exchanger 4; an outlet 34 of the second heat exchange cavity is communicated with a first inlet 51 of the liquid storage part, and a first outlet 52 of the liquid storage part is communicated with an inlet 33 of the second heat exchange cavity, so that a passage is formed between the first heat exchanger 3 and the liquid storage part 5; an outlet 44 of the fourth heat exchange cavity is communicated with a first inlet 51 of the liquid storage part, and a first outlet 52 of the liquid storage part is communicated with an inlet 43 of the fourth heat exchange cavity, so that a passage is formed between the second heat exchanger 4 and the liquid storage part 5; in addition, the outlet 34 of the second heat exchange cavity can be communicated with the inlet 43 of the fourth heat exchange cavity, so that a passage can be formed among the first heat exchanger 3, the second heat exchanger 4 and the liquid storage part 5. In this embodiment:
the cleaning component 1, the heating component 2, the first heat exchanger 3, the second heat exchanger 4 and the liquid storage component 5 are communicated through a connecting pipeline 8.
The first outlet 11 of the cleaning component is communicated with the inlet 31 of the first heat exchange cavity through a first connecting pipeline 80, the outlet 32 of the first heat exchange cavity is communicated with the first inlet 12 of the cleaning component through a second connecting pipeline 81, the first outlet 21 of the heating component is communicated with the inlet 41 of the third heat exchange cavity through a third connecting pipeline 82, the outlet 34 of the third heat exchange cavity is communicated with the first inlet 22 of the heating component through a fourth connecting pipeline 83, the first outlet 52 of the liquid storage component is communicated with the inlet 33 of the second heat exchange cavity through a fifth connecting pipeline 84, the outlet 34 of the second heat exchange cavity is communicated with the inlet 43 of the fourth heat exchange cavity through a sixth connecting pipeline 85, the outlet 44 of the fourth heat exchange cavity is communicated with the first inlet 51 of the liquid storage component through a seventh connecting pipeline 86, and one end of an eighth connecting pipeline 87 is communicated with the fifth connecting pipeline 84, the other end of the eighth connecting pipeline 87 is communicated with the seventh connecting pipeline 96, one end of the ninth connecting pipeline 88 is communicated with the eighth connecting pipeline 87, the other end of the ninth connecting pipeline 88 is communicated with the sixth connecting pipeline 85, and the second outlet 54 of the liquid storage part is communicated with the second inlet 14 of the cleaning part through the tenth connecting pipeline 89.
The pump assembly 6 comprises a first circulating pump 61 and a second circulating pump 62, the outlet 34 of the second heat exchange cavity and the outlet 44 of the fourth heat exchange cavity are communicated with the inlet of the first circulating pump 61, the outlet of the first circulating pump 61 is communicated with the first inlet 51 of the liquid storage part, and the second circulating pump 62 is arranged on a connecting pipeline between the first outlet 11 of the cleaning part and the inlet 31 of the first heat exchange cavity. In this embodiment: the first circulation pump 61 is provided on the first connection line 80, and the second circulation pump 62 is provided on the seventh connection line 96 between the other end of the eighth connection line 87 and the first inlet 51 of the liquid storage part.
The induced draft fan 7 is arranged on a connecting pipeline between the first outlet 21 of the heating component and the inlet 41 of the third heat exchange cavity. In this embodiment: the induced draft fan 7 is provided on the third connecting pipe 82.
A valve assembly 10 is provided on the connecting line 8 between the respective components, and the valve assembly 10 is used to control the on/off of the connecting line 8. In this embodiment:
the valve assembly 10 includes a first control valve 101, a second control valve 102, a third control valve 103, a fourth control valve 104, a fifth control valve 105, a sixth control valve 106, a seventh control valve 107, an eighth control valve 108, a ninth control valve 109, a tenth control valve 110, an eleventh control valve 111, a twelfth control valve 112, a thirteenth control valve 113, and a fourteenth control valve 114. A first control valve 101 is arranged on the first connecting pipeline 80 and located downstream of the first circulating pump 61, a second control valve 102 is arranged on the second connecting pipeline 81, a third control valve 103 is arranged on the third connecting pipeline 82 and located downstream of the induced draft fan 7, a fourth control valve 104 is arranged on the fourth connecting pipeline 83, a fifth control valve 105 is arranged on the fifth connecting pipeline 84 and located between one end of the eighth connecting pipeline 87 and the inlet 33 of the second heat exchange chamber, a sixth control valve 106 and a seventh control valve 107 are both arranged on the sixth connecting pipeline 85 and located on both sides of the other end of the ninth connecting pipeline 88, respectively, an eighth control valve 108 is arranged on the seventh connecting pipeline 86 and located between the other end of the eighth connecting pipeline 87 and the outlet 44 of the fourth heat exchange chamber, a ninth control valve 109 and a tenth control valve 110 are both arranged on the eighth connecting pipeline 87 and located on both sides of one end of the ninth connecting pipeline 88, an eleventh control valve 111 is provided on the tenth connecting line 89, a twelfth control valve 112 is provided at the second outlet 13 of the cleaning part, a thirteenth control valve 113 is provided at the second inlet 23 of the heating part, and a fourteenth control valve 114 is provided at the second inlet 53 of the liquid storage part.
The heating part 2, the liquid storage part 5 and the cleaning part 1 are all provided with heat insulation materials outside and used for preventing heat loss. The outside of the connecting pipeline 8 among the heating part 2, the first heat exchanger 3, the second heat exchanger 4, the liquid storage part 5 and the cleaning part 1 is wrapped by heat insulation materials for reducing heat loss.
The whole operation process of the device is automatically controlled by adopting a PLC controller, namely the on-off of the valve component 10, the pump component 6 and the induced draft fan 7 are automatically controlled by the PLC controller.
In the using process of the embodiment:
and cleaning the catalyst to be regenerated in the cleaning part 1 by using a 65 ℃ cleaning solution, wherein the weight of the cleaning solution is 5 tons, 6 catalysts are cleaned each time, and the cleaning solution forms a waste liquid after the cleaning is finished, so that the heat of the waste liquid is recycled. After the catalyst is cleaned, opening a first control valve 101, a second control valve 102, a fifth control valve 105, a sixth control valve 106, a tenth control valve 110, a first circulating pump 61 and a second circulating pump 62, keeping the rest of the control valves and the induced draft fan 7 in a closed state, allowing the waste liquid to enter a first heat exchange cavity of the first heat exchanger 3, and allowing the solution to be heated in the liquid storage part 5 to enter a second heat exchange cavity of the first heat exchanger 3 and absorb the heat of the waste liquid for heating; after heat exchange is finished, the heated solution enters the liquid storage part 5 and is stored in the liquid storage part, and the waste liquid after heat exchange enters the cleaning part 1 again; when the temperature of the waste liquid in the cleaning component 1 is consistent with the temperature of the solution at the outlet 34 of the second heat exchange cavity, the twelfth control valve 112 is opened, and the rest of the control valves, the first circulating pump 61 and the second circulating pump 62 are closed, so that the waste liquid after heat exchange is discharged from the second outlet 13 of the cleaning component.
And (3) heating and drying the cleaned catalyst by adopting high-temperature gas of 250 ℃ in the heating part 2, heating and drying 6 catalysts each time, forming waste gas by the high-temperature gas after heating and drying, and recycling the heat of the waste gas. When the heating drying is carried out, the thirteenth control valve 113 is opened, the other control valves are kept closed, the air is heated to 250 ℃ through natural gas, and the air enters the heating part 2 through the second inlet 23 of the heating part; after the heating and drying are finished, closing the thirteenth control valve 113, opening the third control valve 103, the fourth control valve 104, the seventh control valve 107, the eighth control valve 108, the ninth control valve 109, the induced draft fan 7 and the second circulating pump 62, keeping the first circulating pump 61 and the other control valves in a closed state, allowing the waste gas to enter a third heat exchange cavity of the second heat exchanger 4, allowing the solution to be heated in the liquid storage part 5 to enter the third heat exchange cavity of the second heat exchanger 4, and absorbing the heat of the waste gas for heating; after heat exchange is finished, the heated solution enters the liquid storage part 5 and is stored in the liquid storage part, and the waste gas after heat exchange enters the heating part 2 again; when the temperature of the waste gas in the heating part 2 is consistent with the temperature of the solution at the outlet 44 of the fourth heat exchange cavity, all the control valves, the induced draft fan 7 and the second circulating pump 62 are closed to complete the heat exchange process, and at the moment, the catalyst is cooled and taken out of the heating part 2.
In consideration of heat loss during actual operation, the heat exchange efficiency of the first heat exchanger 3 and the second heat exchanger 4 is 0.8, and 5 tons of the solution in the liquid storage part 5 can be heated to 75 ℃ through the above steps.
After the waste liquid after heat exchange is completely discharged from the second outlet 13 of the cleaning component, the eleventh control valve 111 is opened to allow the heated solution in the liquid storage component 5 to enter the cleaning component 1, and a chemical is added to form a new cleaning solution.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. A waste heat utilization method in a denitration catalyst regeneration process is characterized by comprising the following steps: the method comprises the following steps:
s10: cleaning a catalyst to be regenerated by using a cleaning solution at the temperature of 60-70 ℃, introducing the waste liquid after the catalyst is cleaned into a first heat exchanger, collecting the heat of the waste liquid introduced into the first heat exchanger, and heating the solution stored in a liquid storage part;
s11: heating and drying the cleaned catalyst by using gas at the temperature of 200-400 ℃, introducing the waste gas after the catalyst is heated and dried into a second heat exchanger, collecting the heat of the waste gas introduced into the second heat exchanger, and heating the solution stored in the liquid storage part;
s2: adding medicament into the solution heated by S10 and S11 to form new cleaning solution.
2. The method for utilizing the waste heat in the denitration catalyst regeneration process according to claim 1, wherein: in S10 and S11, the temperature of the waste liquid is 60-70 ℃, the temperature of the waste gas is 200-400 ℃, and the solution stored in the liquid storage part is heated to 70-95 ℃.
3. An apparatus for implementing the method for utilizing the residual heat from the denitration catalyst regeneration process as claimed in any one of claims 1 to 2, the apparatus comprising a cleaning component and a heating component, the cleaning component is used for cleaning the catalyst to be regenerated, the heating component is used for heating and drying the cleaned catalyst, and the method is characterized in that: the device also comprises a first heat exchanger, a second heat exchanger, a liquid storage part and a valve component,
a space for placing a catalyst to be regenerated is formed in the cleaning component, the cleaning component is provided with a first outlet and a first inlet, the first outlet of the cleaning component is used for discharging waste liquid after the catalyst is cleaned, the first inlet of the cleaning component is used for introducing the waste liquid after heat exchange in the first heat exchanger,
a space for placing the cleaned catalyst is formed inside the heating component, the heating component is provided with a first outlet and a first inlet, the first outlet of the heating component is used for discharging the exhaust gas after the catalyst is heated and dried, the first inlet of the heating component is used for introducing the exhaust gas after heat exchange in the second heat exchanger,
the first heat exchanger is provided with a first heat exchange cavity and a second heat exchange cavity, the first heat exchange cavity is provided with an inlet and an outlet, the inlet of the first heat exchange cavity is used for introducing waste liquid after the catalyst is cleaned, the outlet of the first heat exchange cavity is used for discharging the waste liquid after heat exchange in the first heat exchanger, the second heat exchange cavity is provided with an inlet and an outlet, the inlet of the second heat exchange cavity is used for introducing a solution to be heated, and the outlet of the second heat exchange cavity is used for discharging the heated solution,
the second heat exchanger is provided with a third heat exchange cavity and a fourth heat exchange cavity, the third heat exchange cavity is provided with an inlet and an outlet, the inlet of the third heat exchange cavity is used for introducing waste gas after the catalyst is heated and dried, the outlet of the third heat exchange cavity is used for discharging the waste gas after heat exchange in the second heat exchanger, the fourth heat exchange cavity is provided with an inlet and an outlet, the inlet of the fourth heat exchange cavity is used for introducing a solution to be heated, and the outlet of the fourth heat exchange cavity is used for discharging the heated solution,
the liquid storage part is provided with a first inlet and a first outlet, the first inlet of the liquid storage part is used for introducing heated solution, the first outlet of the liquid storage part is used for discharging the solution to be heated,
the first outlet of the cleaning component is communicated with the inlet of the first heat exchange cavity, the outlet of the first heat exchange cavity is communicated with the first inlet of the cleaning component, the outlet of the second heat exchange cavity is communicated with the first inlet of the liquid storage component, the first outlet of the liquid storage component is communicated with the inlet of the second heat exchange cavity,
the first outlet of the heating component is communicated with the inlet of the third heat exchange cavity, the outlet of the third heat exchange cavity is communicated with the first inlet of the heating component, the outlet of the fourth heat exchange cavity is communicated with the first inlet of the liquid storage component, the first outlet of the liquid storage component is communicated with the inlet of the fourth heat exchange cavity,
the outlet of the second heat exchange cavity is communicated with the inlet of the fourth heat exchange cavity,
the valve assembly is arranged on a connecting pipeline among the components and used for controlling the on-off of the connecting pipeline.
4. The device for realizing the waste heat utilization method in the denitration catalyst regeneration process according to claim 3, characterized in that: the device still include the pump package, the pump package include first circulating pump, second circulating pump, the export of second heat transfer chamber, the export of fourth heat transfer chamber all with the entry of first circulating pump be linked together, the export of first circulating pump with the first entry of stock solution part be linked together, the second circulating pump set up cleaning unit's first export with the entry between first heat transfer chamber on the connecting pipeline.
5. The device for realizing the waste heat utilization method in the denitration catalyst regeneration process according to claim 3, characterized in that: the device still include the draught fan, the draught fan set up the heating member first export with the entry of third heat transfer chamber between the connecting pipeline.
6. The device for realizing the waste heat utilization method in the denitration catalyst regeneration process according to claim 3, characterized in that: the liquid storage part is also provided with a second outlet, the cleaning part is also provided with a second inlet, the second outlet of the liquid storage part is communicated with the second inlet of the cleaning part, and the second outlet of the liquid storage part is used for discharging heated solution to the cleaning part.
7. The device for realizing the waste heat utilization method in the denitration catalyst regeneration process according to claim 3, characterized in that: the liquid storage part is also provided with a second inlet, and the second inlet of the liquid storage part is used for supplementing the solution to be heated to the interior of the liquid storage part.
8. The device for realizing the waste heat utilization method in the denitration catalyst regeneration process according to claim 3, characterized in that: the cleaning component is also provided with a second outlet, and the second outlet of the cleaning component is used for discharging waste liquid after heat exchange.
9. The device for realizing the waste heat utilization method in the denitration catalyst regeneration process according to claim 3, characterized in that: the heating part is also provided with a second inlet, and the second inlet of the heating part is used for supplementing gas with the temperature of 200-400 ℃ to the inside of the heating part.
10. The device for realizing the waste heat utilization method in the denitration catalyst regeneration process according to claim 3, characterized in that: the heating part, the liquid storage part and the cleaning part are all externally provided with heat insulation materials; and the outside of the connecting pipeline among the heating part, the first heat exchanger, the second heat exchanger, the liquid storage part and the cleaning part is wrapped with a heat insulation material.
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Application publication date: 20211008 |