CN210845774U - Desulfurization and denitrification flue gas whitening system - Google Patents
Desulfurization and denitrification flue gas whitening system Download PDFInfo
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- CN210845774U CN210845774U CN201921662373.XU CN201921662373U CN210845774U CN 210845774 U CN210845774 U CN 210845774U CN 201921662373 U CN201921662373 U CN 201921662373U CN 210845774 U CN210845774 U CN 210845774U
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Abstract
The utility model provides a desulfurization and denitrification flue gas whitening system, which comprises a spray condensing device and a membrane separation device which are connected in sequence; the spraying and condensing device comprises a liquid collecting module and a condensing module arranged at the top of the liquid collecting module, and the condensing module is connected with a gas inlet of the membrane separation device; an air inlet pipeline is arranged in the condensation module, and a nozzle is arranged at the air outlet end of the air inlet pipeline. The white-eliminating system is simple in structure, and the water vapor content in the desulfurized and denitrified flue gas is reduced by utilizing the synergistic effect of pressure change and membrane separation, so that the white-eliminating purpose is achieved.
Description
Technical Field
The utility model belongs to the technical field of the environmental protection, a system of handling the flue gas is related to, especially relate to a SOx/NOx control flue gas system of whitening that disappears.
Background
The sintering flue gas contains a large amount of nitrogen oxides, sulfur dioxide and particulate matters, and the prior art mainly comprises a reduction method, an oxidation method and a decomposition method for removing the nitrogen oxides in the sintering flue gas. The SNCR and SCR in the reduction method can reduce the emission concentration of nitrogen oxides to 50mg/m3The following.
The methods for removing sulfur dioxide mainly comprise a wet method, a dry method and a semi-dry method, wherein the wet method comprises a limestone-gypsum method, an ammonia method, a magnesium oxide method and a double-alkali washing method. The wet desulphurization technology is mature, and the wet desulphurization technology is more applied to processes including a calcium method and an ammonia method, wherein the ammonia desulphurization efficiency can reach more than 98%. The method for removing the particles after desulfurization mainly comprises a high-efficiency demister, a cooling condenser, a wet electric dust remover and the like, and liquid drops and particles carried in desulfurization flue gas are captured by an active or passive method, so that the purpose of removing the particles is achieved.
However, when the flue gas is discharged from a chimney after desulfurization and denitrification, a large amount of small liquid drops are generated, which not only causes adverse public and social effects, but also causes condensed liquid water and residual SO in the desulfurization and denitrification flue gas2Sulfurous acid liquid drops are generated, sulfurous acid is further converted into sulfuric acid liquid drops with stronger corrosion capability under the action of oxygen, sulfuric acid liquid drops are formed in the chimney to form leakage point corrosion on the chimney, and the service life of the chimney is shortened. Outside the chimney due to steam coolingThe droplets of sulphuric acid formed by condensation fall back to the ground in the form of acid rain, which further increases the corrosion rate of the equipment surrounding the chimney.
The influencing factors of the white smoke formed at the top of the chimney are quite complex and mainly comprise: the absolute moisture content of the smoke at the outlet of the chimney, the smoke discharging temperature of the smoke, the atmospheric humidity, the atmospheric temperature, the smoke discharging linear velocity and the wind speed at the top of the chimney are different, therefore, the influence factors for generating the white smoke are numerous, the probability and the form of the white smoke are different under different weather conditions, and the controllable factors are the absolute moisture content in the discharged smoke and the discharging temperature of the smoke, therefore, the white smoke elimination phenomenon can be started from the two aspects of controlling the moisture content of the smoke and increasing the smoke discharging temperature of the smoke.
CN 208066095U discloses a device that is used for thermal power plant's desulfurization circulation thick liquid cooling white smoke that disappears, the device installs electronic butterfly valve in the bottom side of desulfurizing tower, and electronic butterfly valve, thick liquid circulating pump inlet tube, thick liquid circulating pump, thick liquid cooler, thick liquid jet pressure boost device, thick liquid circulating pump outlet pipe and top layer shower are connected in order. The device reduces the moisture content of the flue gas by reducing the water supplement amount of the desulfurizing tower, and further eliminates white smoke. But the device only reduces the moisture content by a method of reducing the temperature by 8 ℃, but the water vapor in the smoke is still saturated water vapor, and the white smoke phenomenon still exists.
CN 206989173U discloses an energy-saving flash tank white elimination system, including a once-through boiler start drain flash tank white elimination system and a drum boiler fixed-row flash tank white elimination system. The white system that disappears realizes working medium through the exhaust suction who comes the flash vessel and retrieves, eliminates white pollution, simultaneously, is provided with the condensate water preheater at flash vessel bottom export and carries out the heat exchange with the flash vessel drainage. However, the white smoke eliminating system device is complex in composition, white smoke elimination is realized by a working medium recycling method, and the problem of white smoke existing in the process of discharging the working medium cannot be solved.
CN 109603546A discloses a sintering flue gas desulfurization, denitrification, dedusting, whitening and purification process method, which comprises the following steps: the sintering flue gas is introduced into a rotary flue gas heat exchanger, and exchanges heat with high-temperature sintering flue gas entering the rotary flue gas heat exchanger after denitration, the sintering flue gas after temperature rise is mixed with ammonia gas after being heated to more than 300 ℃, and then the sintering flue gas enters a denitration reactor for flue gas denitration, the high-temperature sintering flue gas after denitration enters an ammonia desulphurization system through the rotary flue gas heat exchanger, and finally deep dust removal and demisting are carried out, so that the desulfurized clean flue gas after desulfurization and demisting enters a temperature rise section. The method adopts a heat exchange and temperature rise method to achieve the aim of white elimination, and has high energy consumption.
Therefore, the desulfurization and denitrification flue gas whitening system which is simple in structure, energy-saving and environment-friendly is provided for whitening the flue gas subjected to desulfurization and denitrification, and has important significance for improving the economic benefit of enterprises and reducing the environmental pollution pressure.
SUMMERY OF THE UTILITY MODEL
To the not enough of prior art existence, the utility model aims to provide a white system disappears of SOx/NOx control flue gas. The white-eliminating system is simple in structure, and the water vapor content in the desulfurized and denitrified flue gas is reduced by utilizing the synergistic effect of pressure change and membrane separation, so that the white-eliminating purpose is achieved.
To achieve the purpose, the utility model adopts the following technical proposal:
the utility model provides a SOx/NOx control flue gas white system that disappears, SOx/NOx control flue gas white system that disappears is including the injection condensing equipment and the membrane separation device that connect gradually.
The spraying and condensing device comprises a liquid collecting module and a condensing module arranged at the top of the liquid collecting module, and the condensing module is connected with a gas inlet of the membrane separation device.
An air inlet pipeline is arranged in the condensation module, and a nozzle is arranged at the air outlet end of the air inlet pipeline.
The water vapor contained in the desulfurization and denitrification flue gas generated by wet desulfurization and denitrification is saturated water vapor, and the water vapor can be condensed into small droplets due to the change of temperature and pressure, so that white mist appears. The utility model discloses a set up the admission line that has the nozzle in condensation module, make the desulfurization take off a round trip the flue gas and spout condensation module's inner wall with the form that sprays to utilize pressure variation and temperature variation to make the vapor condensation, reach preliminary dehumidification's purpose.
Preferably, the nozzle is a critical venturi nozzle. The critical venturi nozzle is the nozzle that the entrance aperture reduces gradually to the throat again by throat's gradual expansion, and wherein the minimum part in aperture is the throat, and setting up through critical venturi nozzle makes the pressure of SOx/NOx control flue gas take place the rapid change to reach the purpose of dehumidification.
Preferably, the ratio of the inlet end diameter to the throat diameter of the critical venturi nozzle is (2-4: 1), and may be, for example, 2:1, 2.5:1, 3:1, 3.5:1 or 4: 1.
Preferably, a back pressure valve is arranged on the gas inlet pipeline in the condensing module, so that the desulfurization and denitrification flue gas is sprayed out from the critical Venturi nozzle after the gas pressure is increased to a set pressure.
Preferably, the liquid collecting module is a liquid collecting tank and/or a liquid collecting groove.
Preferably, the condensation module is a condensation pipe. Further preferably, the outer wall of the condensing pipe is provided with a jacket for flowing a refrigerant, so that the temperature of the condensing pipe is lower than that of the desulfurization and denitrification flue gas.
Preferably, the included angle between the axis of the condensing pipe and the top plane of the liquid collecting module is 60-90 degrees, such as 60 degrees, 65 degrees, 70 degrees, 75 degrees, 80 degrees, 85 degrees or 90 degrees.
Preferably, the membrane separation device is a hollow fiber ceramic membrane separation device. The ceramic membrane used by the hollow fiber ceramic membrane separation device is a selective permeable membrane which only can allow water molecules to pass through.
Hollow fiber ceramic membrane separator is gas-liquid cavity ceramic fiber membrane separator, and residual vapor in the desulfurization denitration flue gas after preliminary dehumidification adsorbs and transmits the outside to the hollow ceramic fiber membrane under the promotion of driving force in the hollow ceramic fiber membrane inside to reach the purpose of further dehumidification.
Preferably, the desulfurization and denitrification flue gas whitening system further comprises a heat exchange device connected with the gas outlet of the membrane separation device.
Preferably, the heat exchange device comprises a shell-and-tube heat exchanger and/or a plate heat exchanger.
As the utility model provides a SOx/NOx control flue gas disappears preferred technical scheme of white system, SOx/NOx control flue gas disappears white system including the injection condensing equipment, membrane separator and the heat transfer device that connect gradually.
The spray condensing device comprises a liquid collecting module and a condensing pipe arranged at the top of the liquid collecting module, and the included angle between the axis of the condensing pipe and the top plane of the liquid collecting module is 60-90 degrees.
An air inlet pipeline is arranged in the condensation pipe, and a critical Venturi nozzle is arranged at the air outlet end of the air inlet pipeline; the water vapor in the flue gas sprayed out from the critical Venturi nozzle flows into the liquid collecting module after being condensed, and the residual flue gas flows into the membrane separation device from the gas inlet of the membrane separation device.
And a gas outlet of the membrane separation device is connected with the heat exchange device, so that the dehumidified flue gas flows through the heat exchange device and is discharged outside.
The system refers to an equipment system, or a production equipment.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a SOx/NOx control flue gas white elimination system's simple structure utilizes the vapor content in the flue gas after SOx/NOx control is reduced to the synergism of pressure and membrane separation to reach the white purpose of disappearing.
Drawings
FIG. 1 is a schematic structural diagram of a desulfurization and denitrification flue gas whitening system provided in embodiment 1;
fig. 2 is a schematic structural diagram of the desulfurization and denitrification flue gas whitening system provided in embodiment 2.
Wherein: 1-1 liquid collecting tank; 1-2, a condenser pipe; 2, a critical venturi nozzle; 3, a hollow fiber ceramic membrane group; 4, shell-and-tube heat exchanger.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
Example 1
The embodiment provides a desulfurization and denitrification flue gas whitening system, and the schematic structural diagram is shown in fig. 1, and the system comprises a spraying and condensing device, a membrane separation device and a heat exchange device which are connected in sequence.
The spraying and condensing device comprises a liquid collecting tank 1-1 and a condensing pipe 1-2 arranged at the top of the liquid collecting tank 1-1, and the included angle between the axis of the condensing pipe 1-2 and the top plane of the liquid collecting tank 1-1 is 90 degrees.
An air inlet pipeline is arranged in the condensation pipe 1-2, and a critical Venturi nozzle 2 is arranged at the air outlet end of the air inlet pipeline; the ratio of the diameter of the air inlet end of the critical Venturi nozzle to the diameter of the throat part is 2:1, water vapor in the smoke ejected by the critical Venturi nozzle 2 flows into a liquid collecting tank 1-1 after being condensed, the residual smoke flows into a hollow fiber ceramic membrane group 3 from a gas inlet of the hollow fiber ceramic membrane group 3, and the residual smoke is discharged out through a chimney after being further dehumidified.
Example 2
The embodiment provides a desulfurization and denitrification flue gas whitening system, and the schematic structural diagram is shown in fig. 2 and comprises a spraying and condensing device, a membrane separation device and a heat exchange device which are sequentially connected.
The spraying and condensing device comprises a liquid collecting tank 1-1 and a condensing pipe 1-2 arranged at the top of the liquid collecting tank 1-1, and the included angle between the axis of the condensing pipe 1-2 and the top plane of the liquid collecting tank 1-1 is 60 degrees.
An air inlet pipeline is arranged in the condensation pipe 1-2, and a critical Venturi nozzle 2 is arranged at the air outlet end of the air inlet pipeline; the ratio of the diameter of the air inlet end of the critical Venturi nozzle to the diameter of the throat part is 4:1, water vapor in the smoke ejected by the critical Venturi nozzle 2 flows into the liquid collecting tank 1-1 after being condensed, and the residual smoke flows into the hollow fiber ceramic membrane group 3 from the gas inlet of the hollow fiber ceramic membrane group 3.
And a gas outlet of the hollow fiber ceramic membrane group 3 is connected with the shell-and-tube heat exchanger 4, so that the dehumidified flue gas flows through the shell-and-tube heat exchanger 4 and is discharged out of a chimney.
To sum up, the utility model provides a SOx/NOx control flue gas white elimination system simple structure utilizes the vapor content in the change of pressure and the synergism of membrane separation reduction SOx/NOx control back flue gas to reach the mesh of eliminating white.
The applicant states that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and those skilled in the art should understand that any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present invention are within the protection scope and the disclosure scope of the present invention.
Claims (10)
1. A desulfurization and denitrification flue gas whitening system is characterized by comprising a spraying and condensing device and a membrane separation device which are sequentially connected;
the spraying and condensing device comprises a liquid collecting module and a condensing module arranged at the top of the liquid collecting module, and the condensing module is connected with a gas inlet of the membrane separation device;
an air inlet pipeline is arranged in the condensation module, and a nozzle is arranged at the air outlet end of the air inlet pipeline.
2. The system for eliminating the white smoke of the desulfurization and denitrification flue gas as claimed in claim 1, wherein the nozzle is a critical venturi nozzle.
3. The system for eliminating the white smoke of the desulfurization and denitrification flue gas as claimed in claim 2, wherein the ratio of the diameter of the air inlet end to the diameter of the throat part of the critical Venturi nozzle is (2-4): 1.
4. The desulfurization and denitrification flue gas whitening removal system according to claim 1, wherein the liquid collection module is a liquid collection tank and/or a liquid collection tank.
5. The system of claim 4, wherein the condensing module is a condensing tube.
6. The system for eliminating the white smoke of the desulfurization and denitrification flue gas as claimed in claim 5, wherein the included angle between the axis of the condensing pipe and the top plane of the liquid collecting module is 60-90 °.
7. The system for eliminating the white smoke of the desulfurization and denitrification flue gas as claimed in claim 1, wherein the membrane separation device is a hollow fiber ceramic membrane separation device.
8. The system for eliminating the white smoke of the desulfurization and denitrification flue gas as claimed in claim 1, wherein the system for eliminating the white smoke of the desulfurization and denitrification flue gas further comprises a heat exchange device connected with the gas outlet of the membrane separation device.
9. The desulfurization and denitrification flue gas whitening system according to claim 8, wherein the heat exchange device comprises a shell-and-tube heat exchanger and/or a plate heat exchanger.
10. The desulfurization and denitrification flue gas whitening removal system according to claim 1, wherein the desulfurization and denitrification flue gas whitening removal system comprises a spray condensing device, a membrane separation device and a heat exchange device which are connected in sequence;
the spraying and condensing device comprises a liquid collecting module and a condensing pipe arranged at the top of the liquid collecting module, and an included angle between the axis of the condensing pipe and the top plane of the liquid collecting module is 60-90 degrees;
an air inlet pipeline is arranged in the condensation pipe, and a critical Venturi nozzle is arranged at the air outlet end of the air inlet pipeline; the water vapor in the flue gas sprayed out from the critical Venturi nozzle is condensed and flows into the liquid collecting module, and the residual flue gas flows into the membrane separation device from the gas inlet of the membrane separation device;
and a gas outlet of the membrane separation device is connected with the heat exchange device, so that the dehumidified flue gas flows through the heat exchange device and is discharged outside.
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| CN201921662373.XU CN210845774U (en) | 2019-09-29 | 2019-09-29 | Desulfurization and denitrification flue gas whitening system |
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| CN201921662373.XU CN210845774U (en) | 2019-09-29 | 2019-09-29 | Desulfurization and denitrification flue gas whitening system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112535936A (en) * | 2020-12-03 | 2021-03-23 | 中国石油化工股份有限公司 | Device and method for slowing down corrosivity of acid gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112535936A (en) * | 2020-12-03 | 2021-03-23 | 中国石油化工股份有限公司 | Device and method for slowing down corrosivity of acid gas |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A flue gas whitening system for desulfurization and denitrification Effective date of registration: 20210622 Granted publication date: 20200626 Pledgee: Guangdong Development Bank Limited by Share Ltd. Guangzhou branch Pledgor: GUANGDONG JIADE ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. Registration number: Y2021440000206 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20220623 Granted publication date: 20200626 Pledgee: Guangdong Development Bank Limited by Share Ltd. Guangzhou branch Pledgor: GUANGDONG JIADE ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. Registration number: Y2021440000206 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A desulfurization and denitration flue gas whitening system Effective date of registration: 20220628 Granted publication date: 20200626 Pledgee: Guangdong Development Bank Limited by Share Ltd. Guangzhou branch Pledgor: GUANGDONG JIADE ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. Registration number: Y2022440000146 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |