CN109268852A - A kind of processing system and its processing method of formaldehyde tail gas - Google Patents
A kind of processing system and its processing method of formaldehyde tail gas Download PDFInfo
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- CN109268852A CN109268852A CN201811101256.6A CN201811101256A CN109268852A CN 109268852 A CN109268852 A CN 109268852A CN 201811101256 A CN201811101256 A CN 201811101256A CN 109268852 A CN109268852 A CN 109268852A
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- Prior art keywords
- tail gas
- formaldehyde
- heater
- shell side
- steam generator
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
- F23G7/07—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases in which combustion takes place in the presence of catalytic material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
- F23G7/061—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating
- F23G7/065—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel
- F23G7/066—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases with supplementary heating using gaseous or liquid fuel preheating the waste gas by the heat of the combustion, e.g. recuperation type incinerator
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Catalysts (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The present invention a kind of processing system and processing method of formaldehyde tail gas, tail gas pre-heater including being connected to formaldehyde production equipment tail end in turn, ECS reactor, steam generator and boiler water preheater, tail gas electric heater is also set up between tail gas pre-heater and ECS reactor, the high-temperature tail gas outlet of ECS reactor lower end is separately connected the shell side of tail gas pre-heater and the tube side of steam generator by pipeline, the shell side of tail gas pre-heater is also connect with the tube side of steam generator, noble metal catalyst bed is set in ECS reactor, the shell side lower end of steam generator connects hot soft water storage tank by hot soft water import, the shell side upper end of steam generator connects jet chimney by steam (vapor) outlet, the shell side lower end of boiler water preheater connects removal bitter and fishiness by desalted water interface, the shell side upper end of boiler water preheater passes through hot soft water Outlet connects hot soft water storage tank, and the processing system and processing method of the formaldehyde tail gas, catalytic conversion efficiency is high, low energy consumption, and recoverable waste heat from tail gas.
Description
Technical field
The present invention relates to formaldehyde production equipment more particularly to a kind of processing systems and its processing method of formaldehyde tail gas.
Background technique
The technological principle of Formaldehyde Production is that methanol and air react generate formaldehyde under the effect of the catalyst, currently,
The tail gas that simple oxidizing process (iron molybdenum method) methanol formaldehyde plant generates, the exhaust treatment system energy of traditional formaldehyde production equipment
Consumption is big, removal rate is low, and energy waste is big.
Summary of the invention
The applicant is directed to the above technology status, and PARA FORMALDEHYDE PRILLS(91,95) production technology is studied and improved, and invents a kind of formaldehyde
The processing system and its processing method of tail gas.
The technical solution adopted in the present invention is as follows:
A kind of processing system of formaldehyde tail gas, tail gas pre-heater, ECS including being connected to formaldehyde production equipment tail end in turn
Reactor, steam generator and boiler water preheater also set up tail gas electric heating between the tail gas pre-heater and ECS reactor
Device, the high-temperature tail gas outlet of ECS reactor lower end are separately connected shell side and the steam generation of tail gas pre-heater by pipeline
The tube side of device, the shell side of tail gas pre-heater are also connect with the tube side of steam generator, and setting noble metal is urged in the ECS reactor
The shell side lower end of agent bed, the steam generator connects hot soft water storage tank, the shell of steam generator by hot soft water import
Cheng Shangduan connects jet chimney by steam (vapor) outlet, and the shell side lower end of the boiler water preheater is de- by the connection of desalted water interface
The shell side upper end of salt water installations, boiler water preheater connects hot soft water storage tank by hot soft water outlet.
As a further improvement of the above technical scheme:
Platinum palladium catalyst is used in noble metal catalyst bed, there is good thermal stability, it is ensured that in high temperature shape
Catalytic activity is kept under state for a long time.
A kind of processing method of formaldehyde tail gas, including following process:
1) tail gas generates: formaldehyde production equipment generates tail gas during reaction produces formaldehyde, in tail gas comprising oxygen,
Carbon monoxide and a small amount of dimethyl ether, methanol and formaldehyde；
2) tail gas preheats: tail gas enters tail gas pre-heater tube side from formaldehyde production equipment, needs to start when system just starts
Tail gas electric heater heats tail gas, and after equipment runs a period of time, the high-temperature tail gas that can be generated by ECS reactor enters tail gas
Preheater shell side, with the tail gas heat exchange tail gas for entering tail gas pre-heater tube side；
3) catalytic burning: the tail gas after preheating enters ECS reactor and carries out catalytic burning at noble metal catalyst bed,
Carbon monoxide and a small amount of dimethyl ether, methanol and oxidation of formaldehyde in tail gas is formed into carbon dioxide and water, that is, is formed clean
High-temperature tail gas, clean high-temperature tail gas a part enters tail gas pre-heater shell side, carries out tail gas preheating, and another part is directly logical
After the high-temperature tail gas for entering the tube side of steam generator, and entering tail gas pre-heater shell side completes tail gas preheating, steam hair is entered back into
The tube side of raw device；
4) steam generation: clean high-temperature tail gas enters the tube side of steam generator, enters steam with from hot soft water import
Hot soft water heat exchange in the shell side of generator, can form steam, collect and use from steam (vapor) outlet and steam pipe discharge；
5) soft water preheats: clean high-temperature tail gas enters back into the tube side of boiler water preheater after steam generator, and
It exchanges heat with the desalted water for entering boiler water preheater shell side from desalted water interface, hot soft water can be formed, can be gone out by hot soft water
Mouth is sent into hot soft water storage tank storage, for steam generator use；
6) it exhaust emissions: after clean high-temperature tail gas absorbs waste heat by steam generator and boiler water preheater, reduces
Temperature, finally from high altitude discharge at the top of boiler water preheater into atmosphere.
As a further improvement of the above technical scheme:
The tail gas is heated to 180~200 DEG C by tail gas pre-heater.
Range of reaction temperature in the ECS reactor is 400 DEG C~500 DEG C.
The temperature range for the clean high-temperature tail gas that the tail gas generates after the burning of ECS reactor catalysis is 450~
500℃。
The temperature range for the hot soft water that the desalted water is thermally formed in boiler water preheater is 90~100 DEG C.
Temperature is reduced to 50~60 after clean high-temperature tail gas absorbs waste heat by steam generator and boiler water preheater
℃。
Beneficial effects of the present invention are as follows: the processing system and its processing method of the formaldehyde tail gas, and waste heat benefit is arranged in (1)
With system, the thermal energy generated during catalytic burning is sufficiently recycled；(2) catalytic burning technique, it is effective using noble metal catalyst
Removal carbon monoxide and a small amount of organic matter, catalytic conversion efficiency are up to 99%；(3) only need 400 DEG C~500 DEG C at a temperature of
Low-temperature catalytic oxidation reaction is carried out, and reduces heating device energy consumption about 40% simultaneously, this catalytic burning method has economic and peace
Full great advantage；(4) noble metal catalyst used has good thermal stability, it is ensured that long-term at high operating temperatures
Keep catalytic activity.
Detailed description of the invention
Fig. 1 is the processing system of formaldehyde tail gas of the invention and its structural schematic diagram of processing method.
In figure: 1, tail gas pre-heater；2, ECS reactor；21, noble metal catalyst bed；3, steam generator；31, hot
Soft water import；32, steam (vapor) outlet；4, boiler water preheater；41, desalted water interface；42, hot soft water outlet；5, tail gas electric heating
Device.
Specific embodiment
With reference to the accompanying drawing, illustrate the specific embodiment of the present embodiment
As shown in Figure 1, the processing system of the formaldehyde tail gas of the present embodiment, including it is connected to formaldehyde production equipment tail end in turn
Tail gas pre-heater 1, ECS reactor 2, steam generator 3 and boiler water preheater 4, tail gas pre-heater 1 and ECS reactor 2 it
Between also set up tail gas electric heater 5, the high-temperature tail gas of 2 lower end of ECS reactor, which is exported, is separately connected tail gas pre-heater 1 by pipeline
Shell side and steam generator 3 tube side, the shell side of tail gas pre-heater 1 also connect with the tube side of steam generator 3, ECS reaction
Noble metal catalyst bed 21 is set in device 2, and the shell side lower end of steam generator 3 connects hot soft water by hot soft water import 31 and stores up
The shell side upper end of slot, steam generator 3 connects steam pipe by steam (vapor) outlet 32, and the shell side lower end of boiler water preheater 4 passes through
Desalted water interface 41 connects removal bitter and fishiness, and the shell side upper end of boiler water preheater 4 connects hot soft water by hot soft water outlet 42
Storage tank.
Platinum palladium catalyst is used in noble metal catalyst bed 21.
The processing method of the formaldehyde tail gas of the present embodiment, including following process:
1) tail gas generates: formaldehyde production equipment generates tail gas during reaction produces formaldehyde, in tail gas comprising oxygen,
Carbon monoxide and a small amount of dimethyl ether, methanol and formaldehyde；
2) tail gas preheats: tail gas enters 1 tube side of tail gas pre-heater from formaldehyde production equipment, needs to start when system just starts
Tail gas electric heater 5 heats tail gas, and exhaust temperature is made to reach 180~200 DEG C, can be anti-by ECS after equipment runs a period of time
The high-temperature tail gas for answering device 2 to generate enters 1 shell side of tail gas pre-heater, with the tail gas heat exchange tail for entering 1 tube side of tail gas pre-heater
Gas equally can make exhaust temperature reach 180~200 DEG C；
3) catalytic burning: the tail gas after preheating enter ECS reactor 2 carried out at noble metal catalyst bed 21 catalysis burn
It burns, the reaction temperature in ECS reactor 2 is 400 DEG C~500 DEG C, by the carbon monoxide and a small amount of dimethyl ether, first in tail gas
Pure and mild oxidation of formaldehyde forms carbon dioxide and water, the chemical equation of catalytic burning process are as follows:
2CO+O2→2CO2
2CH3OH+3O2→2CO2+4H2O
HCHO+O2→CO2+H2O
CH3OCH3+3O2→2CO2+3H2O
Clean high-temperature tail gas is formed, the temperature of high-temperature tail gas is that clean high-temperature tail gas a part enters tail gas preheating
1 shell side of device carries out tail gas preheating, and another part is passed directly into the tube side of steam generator 3, and enters 1 shell side of tail gas pre-heater
High-temperature tail gas complete waste heat from tail gas after, enter back into the tube side of steam generator 3；
4) steam generation: clean high-temperature tail gas enters the tube side of steam generator 3, steams with entering from hot soft water import 31
Hot soft water heat exchange in the shell side of vapour generator 3, can form steam, collect and use from steam (vapor) outlet 32 and steam pipe discharge；
5) soft water preheats: clean high-temperature tail gas enters back into the tube side of boiler water preheater 4 after steam generator 3,
And exchange heat with the desalted water for entering 4 shell side of boiler water preheater from desalted water interface 41, hot soft water, the temperature of hot soft water can be formed
Spending range is 90~100 DEG C, and hot soft water can be sent into hot soft water storage tank storage by hot soft water outlet 42, for steam generator 3
It uses；
6) exhaust emissions: after clean high-temperature tail gas absorbs waste heat by steam generator 3 and boiler water preheater 4, drop
50~60 DEG C of low temperature, finally from 4 top high altitude discharge of boiler water preheater into atmosphere.
The processing system and its processing method of the formaldehyde tail gas of the present embodiment, simple oxidizing process (iron molybdenum method) methanol formaldehyde
The tail gas that device generates is forward and backward into the processing of ECS system, and wherein each component content and removal rate are as shown in the table after testing:
Catalytic conversion efficiency is up to 99%.
Fully meet " petro chemical industry pollutant emission standard " GB31571-2015
Guarantee tail gas qualified discharge, and recycle the heat in tail gas be used it is energy saving.
Above description is explanation of the invention, is not intended to limit the invention, and limited range of the present invention is referring to right
It is required that the present invention can make any type of modification without prejudice to basic structure of the invention.
Claims (8)
1. a kind of processing system of formaldehyde tail gas, it is characterised in that: the tail gas including being connected to formaldehyde production equipment tail end in turn
Preheater (1), ECS reactor (2), steam generator (3) and boiler water preheater (4), the tail gas pre-heater (1) and ECS
It is also set up between reactor (2) tail gas electric heater (5), the high-temperature tail gas outlet of ECS reactor (2) lower end passes through pipeline
Be separately connected the shell side of tail gas pre-heater (1) and the tube side of steam generator (3), the shell side of tail gas pre-heater (1) also with steam
The tube side of generator (3) connects, and noble metal catalyst bed (21) is arranged in the ECS reactor (2), the steam generator
(3) shell side lower end connects hot soft water storage tank by hot soft water import (31), and the shell side upper end of steam generator (3) passes through steam
It exports (32) and connects jet chimney, the shell side lower end of the boiler water preheater (4) connects desalination by desalted water interface (41)
The shell side upper end of water installations, boiler water preheater (4) connects hot soft water storage tank by hot soft water outlet (42).
2. the processing system of formaldehyde tail gas according to claim 1, it is characterised in that: in noble metal catalyst bed (21)
Using platinum palladium catalyst.
3. a kind of processing method of formaldehyde tail gas, including following process:
1) tail gas generates: formaldehyde production equipment generates tail gas during reaction produces formaldehyde, includes carbon monoxide in tail gas
And a small amount of dimethyl ether, methanol and formaldehyde；
2) tail gas preheats: tail gas enters tail gas pre-heater (1) tube side from formaldehyde production equipment, needs to start tail when system just starts
Pneumoelectric heater (5) heats tail gas, and after equipment runs a period of time, the high-temperature tail gas that can be generated by ECS reactor (2) enters
Tail gas pre-heater (1) shell side, with the tail gas heat exchange tail gas for entering tail gas pre-heater (1) tube side；
3) catalytic burning: the tail gas after preheating enter ECS reactor (2) carried out at noble metal catalyst bed (21) catalysis burn
It burns, carbon monoxide and a small amount of dimethyl ether, the methanol and oxidation of formaldehyde in tail gas is formed into carbon dioxide and water, that is, formed clean
Net high-temperature tail gas, clean high-temperature tail gas a part enter tail gas pre-heater (1) shell side, carry out tail gas preheating, another part
After the high-temperature tail gas for being passed directly into the tube side of steam generator (3), and entering tail gas pre-heater (1) shell side completes tail gas preheating,
Enter back into the tube side of steam generator (3)；
4) steam generation: clean high-temperature tail gas enters the tube side of steam generator (3), steams with entering from hot soft water import (31)
Hot soft water heat exchange in the shell side of vapour generator (3), that is, can produce steam, collect from steam (vapor) outlet (32) and jet chimney discharge
It uses；
5) soft water preheats: clean high-temperature tail gas enters back into the tube side of boiler water preheater (4) after steam generator (3),
And exchange heat with the desalted water for entering boiler water preheater (4) shell side from desalted water interface (41), hot soft water can be formed, can be passed through
Hot soft water outlet (42) is sent into hot soft water storage tank storage, for steam generator (3) use；
6) exhaust emissions: after clean high-temperature tail gas absorbs waste heat by steam generator (3) and boiler water preheater (4), drop
Low temperature, finally from high altitude discharge at the top of boiler water preheater (4) into atmosphere.
4. the processing method of formaldehyde tail gas according to claim 3, it is characterised in that: the tail gas passes through tail gas pre-heater
(1) 180~200 DEG C are heated to.
5. the processing method of formaldehyde tail gas according to claim 3, it is characterised in that: anti-in the ECS reactor (2)
Answering temperature range is 400 DEG C~500 DEG C.
6. the processing method of formaldehyde tail gas according to claim 3, it is characterised in that: the tail gas passes through ECS reactor
(2) temperature range of the clean high-temperature tail gas generated after catalytic burning is 450~500 DEG C.
7. the processing method of formaldehyde tail gas according to claim 3, it is characterised in that: the desalted water is preheated in boiler water
The temperature range for the hot soft water being thermally formed in device (4) is 90~100 DEG C.
8. the processing method of formaldehyde tail gas according to claim 3, it is characterised in that: clean high-temperature tail gas passes through steam
Temperature is reduced to 50~60 DEG C after generator (3) and boiler water preheater (4) absorb waste heat.
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| CN201811101256.6A CN109268852A (en) | 2018-09-20 | 2018-09-20 | A kind of processing system and its processing method of formaldehyde tail gas |
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| CN201811101256.6A CN109268852A (en) | 2018-09-20 | 2018-09-20 | A kind of processing system and its processing method of formaldehyde tail gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110617491A (en) * | 2019-09-25 | 2019-12-27 | 万华化学集团股份有限公司 | Tail gas catalytic incineration tower and tail gas treatment method using same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110617491A (en) * | 2019-09-25 | 2019-12-27 | 万华化学集团股份有限公司 | Tail gas catalytic incineration tower and tail gas treatment method using same |
| CN110617491B (en) * | 2019-09-25 | 2021-03-09 | 万华化学集团股份有限公司 | Tail gas catalytic incineration tower and tail gas treatment method using same |
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