Smoke induced mixed air white smoke elimination system and white smoke elimination method

Abstract

The present invention discloses a smoke induced mixed air whitening system and a whitening smoke elimination method. The smoke induced mixed air whitening system of the present invention comprises a shell, on which a smoke inlet and a smoke outlet are arranged, and an ejector, a water and liquid removal device and a demisting and dust removal device are arranged in sequence in the shell along the airflow direction; the demisting and dust removal device is connected to the smoke outlet; the ejector comprises a nozzle and a receiving chamber, a mixing chamber and a diffusion chamber arranged in sequence along the airflow direction; the diffusion chamber is also provided with a spray device or a plurality of air inlets; the air inlets are the inlets for secondary cooling air; and a drainage device is arranged at the bottom of the ejector. The whitening smoke elimination method of the present invention performs secondary cold air mixing after primary air mixing to reduce the smoke temperature and increase the supersaturation; or sprays a small amount of cooling droplets to effectively increase the nucleation seeds required for smoke condensation, effectively enhance the smoke condensation and nucleation effect, and ultimately improve the smoke whitening effect.

Description

Technical Field

[0001] The invention relates to a smoke induced mixed air white smoke elimination system and a white smoke elimination method. Background Art

[0002] At present, there is still a lot of white smoke in the flue gas emitted by power plant boilers, industrial kilns, etc. after desulfurization and denitrification. After wet desulfurization, the water vapor in the flue gas is basically saturated and has a high moisture content. During the emission process, the temperature of the flue gas decreases during the mixing and diffusion process with the atmosphere, and the water in the flue gas condenses and precipitates, forming white fog around the chimney, commonly known as "smoke plume". The discharged flue gas has a high moisture content, corrodes the chimney, cannot be effectively diffused, promotes the formation of haze, and pollutes the lives and vision of citizens.

[0003] In the existing technical route, generally, a flue gas cooling device is first added to the desulfurization outlet to lower the flue gas dew point, and then a flue gas heating device is installed at the flue gas outlet to increase the flue gas dry bulb temperature, or a MGGH circulation heat exchange system is used for cooling and reheating, or a steam heating system is directly used to realize the flue gas heating and dewhitening. The current processes all require the use of huge heat exchange equipment, and the operation process consumes a lot of heat energy. At the same time, industrial flue gas is generally highly corrosive, and has high requirements for equipment materials. After desulfurization, denitrification and dust removal, there is basically no residual pressure in the flue gas, and a booster fan needs to be added. The above processes have the defects of high overall investment price, high energy consumption, large land area, and high operating energy consumption. Therefore, seeking a new dewhitening process for industrial flue gas dewhitening in order to solve the above-mentioned defects is a technical problem that needs to be solved urgently.

[0004] A Chinese patent document with application number 201810262315.1 discloses a system and method for pressurizing, cooling, recovering and eliminating white smoke in a thermal power plant flue gas. The patent adopts a jet method to mix cold air with the desulfurized flue gas. It is difficult to condense water by directly mixing cold air and flue gas at one time. Therefore, a demister needs to be installed at the air inlet, and a condenser tube needs to be used for cooling and condensing to meet the requirements. Summary of the invention

[0005] The technical problem to be solved by the present invention is to solve the problem of industrial flue gas dewhitening, to overcome the defects of the dewhitening system in the prior art such as high energy consumption, large space, large investment and high operating costs, and to provide a new type of flue gas induced mixed air dewhitening system and dewhitening method, in which a secondary cold air mixing is performed after the primary mixed air to reduce the flue gas temperature and increase the supersaturation; or a small amount of cooling droplets are sprayed to effectively increase the nucleation seeds required for flue gas condensation, effectively enhance the effect of flue gas condensation nucleation, and ultimately improve the flue gas dewhitening effect.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] The present invention provides a smoke induced air mixing and whitening system, comprising a shell, on which a smoke inlet and a smoke outlet are arranged, and in the shell, an eductor, a water and liquid removal device, and a demisting and dust removal device are sequentially arranged along the airflow direction; the demisting and dust removal device is connected to the smoke outlet;

[0008] The ejector comprises a nozzle and a receiving chamber, a mixing chamber and a diffusion chamber arranged in sequence along the airflow direction; the nozzle is the inlet of the primary ejection main air, and the nozzle is arranged in the receiving chamber; the receiving chamber is connected to the smoke inlet; the outlet of the diffusion chamber is connected to the water and liquid removal device; the diffusion chamber is also provided with a spray device or a plurality of air inlets; the air inlets are the inlet of the secondary cooling air;

[0009] A drainage device is arranged at the bottom of the ejector.

[0010] The number of the air inlets can be set according to actual conditions. Preferably, the number of the air inlets is 1 to 2.

[0011] Preferably, the water accumulation device includes a bracket, a baffle, a liquid accumulation baffle and a guide tube, the baffle is arranged on the bracket, the liquid accumulation baffle is located at the lower part of the baffle outlet, and the guide tube is connected to the outflow outlet of the liquid accumulation baffle.

[0012] Preferably, the demisting and dust removing device is a tubular demisting device or a corrugated plate demisting device, which has the function of capturing dust while removing water, thereby reducing the dust content of the outlet flue gas.

[0013] Preferably, a hot air inlet is provided between the mist removal and dust removal device and the flue gas outlet. The hot air inlet is an inlet for hot air and is used to introduce hot air for mixing, thereby increasing the dry-bulb temperature of the flue gas and improving the dewhitening effect.

[0014] Preferably, a smoke and wind damper door is provided in front of the nozzle and / or the air inlet, and the smoke and wind damper door can be manually adjusted according to the external environment.

[0015] The fan for the primary injection main air adopts variable frequency regulation and can be automatically adjusted according to the outlet flue gas dew point.

[0016] The present invention also provides a method for eliminating white smoke by using the smoke induced mixed air white smoke elimination system, comprising:

[0017] (1) The smoke enters the receiving chamber through the smoke inlet, the primary induced main wind enters the receiving chamber through the nozzle, and the smoke and the primary induced main wind are mixed in the mixing chamber;

[0018] (2) the gas mixed in step (1) is sprayed as droplets in the diffusion chamber through the spray device;

[0019] Alternatively, the gas mixed in step (1) is mixed again in the diffusion chamber by the secondary cooling air;

[0020] (3) The gas after step (2) is discharged sequentially through the water and liquid removal device, the mist and dust removal device and the smoke outlet;

[0021] When a hot air inlet is provided between the demisting and dust removing device and the smoke outlet, in step (3), the gas after step (2) passes through the dewatering and liquid accumulation device and the demisting and dust removing device in sequence, and is mixed with the hot air again before being discharged through the smoke outlet;

[0022] The condensed water precipitated in steps (1) to (3) flows into the drainage device.

[0023] The flue gas may be conventional industrial flue gas in the art. Preferably, the flue gas is industrial flue gas after desulfurization and denitrification. More preferably, the flue gas has a temperature of 55 to 70°C (e.g., 60°C, 65°C), a pressure of 50 to 350 Pa (e.g., 100 Pa, 200 Pa, 300 Pa), and a volume flow rate of 80,000 to 250,000 Nm 3 / h (e.g. 100000Nm 3 / h、125000Nm 3 / h、200000Nm 3 / h).

[0024] Preferably, the primary induced main wind and / or the secondary cooling wind are natural cooling winds, and the temperature of the natural cooling wind is the temperature of outdoor air, usually -20°C to 35°C.

[0025] Preferably, the pressure of the primary induced main wind is 4000-6000Pa (for example, 4000Pa, 4500Pa, 5000Pa).

[0026] Preferably, the volume flow ratio of the primary induced main wind to the flue gas is (0.2-1.2):1.

[0027] Preferably, the volume flow ratio of the primary induced main air to the secondary cooling air is 1:(0.2-0.8).

[0028] Preferably, the pressure of the secondary cooling air is 0.1-1000 Pa (eg 300 Pa, 400 Pa, 500 Pa).

[0029] Preferably, the spraying medium of the spraying device is water. The temperature of the spraying medium is 10°C to 30°C. The volume flow rate of the spraying medium is 1 to 10 m 3 / h.

[0030] Preferably, the diameter of the droplets sprayed by the spraying device is 10 μm to 300 μm.

[0031] The source of the hot air can be clean high-temperature flue gas from the original factory area, or it can be hot air heated by steam heating or electric heating system. Preferably, the temperature of the hot air is 80℃~150℃ (for example, 80℃, 82℃). The pressure of the hot air is 100~500pa (for example, 400Pa, 500Pa). The volume flow ratio of the hot air to the flue gas is (0.2~0.5):1.

[0032] The positive and progressive effects of the present invention are:

[0033] The novel flue gas deoxidation system of the present invention adopts the process route of induced air mixing, with natural cooling air as the main fluid and industrial flue gas as the induced fluid. During the induced process, the natural cooling air is in direct contact with the hot and humid industrial flue gas and mixed, the dew point of the system is reduced, and a large amount of condensed water is precipitated during the mixing process. At the same time, the induced air mixing system adopts secondary cooling air mixing or adds a spray device to spray coolant to further remove the moisture content of the flue gas. During the demisting process, the flue gas condensed water is recovered. The demisting itself has a dust removal effect, purifies the final discharged flue gas, reaches the environmental protection index, and has important environmental protection and economic benefits.

[0034] The flue gas injection mixed air whitening system is equipped with a demisting and dust removal device, which can capture dust while removing water, thus reducing the dust content of the outlet flue gas. It has important application value in the treatment of industrial flue gas whitening and dust removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the structure of the smoke induced mixed air whitening system of Example 1 of the present invention;

[0036] Figure 2 for Figure 1 An enlarged view of part A of the water-removing and effluent-removing device shown;

[0037] Figure 3 This is a schematic structural diagram of a smoke induced mixed air whitening system according to Example 2 of the present invention;

[0038] Figure 4 This is a schematic structural diagram of a smoke induced mixed air whitening system according to Embodiment 3 of the present invention;

[0039] Figure 5 This is a schematic diagram of the structure of the smoke injection mixed air whitening system of Example 4 of the present invention.

[0040] Description of reference numerals:

[0041] 1-smoke inlet, 21-nozzle, 22-receiving chamber, 23-mixing chamber, 24-diffusion chamber, 3-water removal and liquid accumulation device, 31-bracket, 32-baffle, 33-liquid accumulation baffle, 34-guide pipe, 4-misting and dust removal device, 5-smoke outlet, 6-drainage device, 7-air inlet, 8-hot air inlet, 9-shell. DETAILED DESCRIPTION

[0042] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0043] Example 1

[0044] like Figures 1-2 The smoke inlet 1 and the smoke outlet 5 are provided on the shell 9.

[0045] An ejector, a water and liquid removal device 3 and a demisting and dust removal device 4 are sequentially arranged in the housing 9 along the airflow direction; the demisting and dust removal device 4 is connected to the smoke outlet 5;

[0046] The ejector comprises a nozzle 21 and a receiving chamber 22, a mixing chamber 23 and a diffusion chamber 24 arranged in sequence along the air flow direction;

[0047] The nozzle 21 is the inlet of the primary injection main wind, and the nozzle 21 is arranged in the receiving chamber 22; the receiving chamber 22 is connected to the smoke inlet 1;

[0048] The outlet of the diffusion chamber 24 is communicated with the water accumulation removal device 3;

[0049] The diffusion chamber 24 is also provided with an air inlet 7; the air inlet 7 is the inlet of the secondary cooling air;

[0050] A drainage device 6 is provided at the bottom of the ejector.

[0051] The water accumulation device 3 comprises a bracket 31, a baffle 32, a liquid accumulation baffle 33 and a guide pipe 34. The baffle 32 is arranged on the bracket 31, the liquid accumulation baffle 33 is located at the lower part of the outlet of the baffle 32, and the guide pipe 34 is connected with the outlet of the liquid accumulation baffle 32. The water vapor in the airflow condenses after passing through the baffle 32 and flows into the guide pipe 34 through the liquid accumulation baffle 33, and finally flows into the drainage device 6 at the bottom under the action of gravity.

[0052] The demisting and dust removing device 4 is a corrugated plate demisting device. During actual production, a tubular demisting device and a corrugated plate demisting device can be selected.

[0053] During actual production, smoke and wind damper doors can be provided at the nozzle 21 and the air inlet 7 as required, and the smoke and wind damper doors can be manually adjusted according to the external environment.

[0054] In actual production, the fan for the primary main air injection can be adjusted by frequency conversion as needed, so as to automatically adjust according to the outlet flue gas dew point.

[0055] Example 2

[0056] like Figure 3 As shown, in the smoke induced mixed air dewhitening system of this embodiment, a hot air inlet 8 is also provided between the mist removal and dust removal device 4 and the smoke outlet 5. By introducing hot air for mixing before the smoke outlet, the dry bulb temperature of the smoke can be increased and the dewhitening effect can be improved.

[0057] Example 3

[0058] like Figure 4 As shown, compared with Example 2, the difference is that the diffusion chamber 24 of the smoke injection mixed air de-whitening system in this embodiment is not provided with an air inlet, but is provided with a spray device 9, and the other parts are the same as Example 2.

[0059] By spraying a small amount of cooling droplets, the nucleation seeds required for flue gas condensation can be effectively increased, the effect of flue gas condensation nucleation can be effectively enhanced, and ultimately the flue gas whitening effect can be improved.

[0060] Example 4

[0061] like Figure 5 As shown, the smoke injection mixed air deoxidation system of this embodiment is in a horizontal direction, and except for the placement direction, other parts are the same as those of embodiment 1.

[0062] Application Example 1

[0063] The induced mixed air white smoke elimination system of Example 1 is used to eliminate white smoke from industrial smoke, which includes the following steps:

[0064] (1) Industrial wet flue gas enters the receiving chamber 22 through the flue gas inlet 1, and the primary induced main wind flows out from the nozzle 21 and enters the receiving chamber 22. Due to the turbulent diffusion of the jet, the primary induced main wind in the receiving chamber 22 sucks the surrounding flue gas and generates momentum exchange. The primary induced main wind and the flue gas are mixed in the mixing chamber 23 to exchange momentum and mass.

[0065] (2) The mixed gas is mixed again in the diffusion chamber 24 by the secondary cooling air, and the flue gas dew point in the system is further reduced, and a large amount of condensed water is precipitated; the condensed water flows into the drainage device 6 at the bottom under the action of gravity;

[0066] (3) A water-removing and liquid-accumulating device 3 is provided at the outlet of the diffusion chamber 24. The water vapor of the mixed gas is precipitated by the demisting process to remove the flue gas condensate, which is then recovered and discharged through the water-removing and liquid-accumulating device 3;

[0067] (4) A demisting and dust removing device 4 is provided at the gas outlet of the water accumulation removal device 3, and the mixed gas after demisting and dust removal is discharged through the smoke outlet 5.

[0068] In step (1), the industrial flue gas introduced into the flue gas inlet 1 is saturated flue gas with a temperature of 65°C and a volume flow rate of 100,000 Nm 3 / h, dust content is 30mg / Nm 3 , the flue gas pressure is 300Pa; the volume flow rate of the primary injection main wind is 60000Nm 3 / h, the temperature is 10°C, and the pressure is 4000 Pa. After mixing in step (1), the flue gas dew point is reduced to 50°C, and the dry bulb temperature is 58°C.

[0069] In step (2), the secondary cooling air volume flow rate is 40000Nm 3 / h, the pressure is 500pa. The temperature of the secondary cooling air is 10°C. After mixing in step (2), the flue gas dew point is further reduced to 45°C, and the dry bulb temperature is 55°C.

[0070] Effect data: The dust content in the flue gas discharged from the flue gas outlet is 5mg / Nm 3 It should be noted that in winter, the dry bulb temperature of the flue gas discharged to the atmosphere reaches 55°C, and the dew point drops below 45°C. At an outside temperature below 0°C, there is no white smoke at the outlet of the induced mixed air whitening system. The total condensate discharged by the induced mixed air whitening system is 2.5m 3 / h.

[0071] It can be seen that the use of the induced mixed air white smoke removal system of Example 1 for white smoke removal treatment can achieve the comprehensive effect of white smoke removal and dust removal.

[0072] Application Example 2

[0073] The induced mixed air white smoke elimination system of Example 2 is used to eliminate white smoke from industrial smoke, which includes the following steps:

[0074] (1) Industrial wet flue gas enters the receiving chamber 22 through the flue gas inlet 1, and the primary induced main wind flows out from the nozzle 21 and enters the receiving chamber 22. Due to the turbulent diffusion of the jet, the primary induced main wind in the receiving chamber 22 sucks the surrounding flue gas and generates momentum exchange. The primary induced main wind and the flue gas are mixed in the mixing chamber 23 to exchange momentum and mass.

[0075] (2) The mixed gas is mixed again in the diffusion chamber 24 by the secondary cooling air, and the flue gas dew point in the system is further reduced, and a large amount of condensed water is precipitated; the condensed water flows into the drainage device 6 at the bottom under the action of gravity;

[0076] (3) A water-removing and liquid-accumulating device 3 is provided at the outlet of the diffusion chamber 24. The water vapor of the mixed gas is precipitated by the demisting process to remove the flue gas condensate, which is then recovered and discharged through the water-removing and liquid-accumulating device 3;

[0077] (4) A demisting and dust removal device 4 is provided at the outlet of the water accumulation removal device 3. The mixed gas after demisting and dust removal is reheated and mixed with hot air through the hot air inlet 8. After mixing, the dry bulb temperature of the flue gas increases and is finally discharged through the flue gas outlet 5.

[0078] In step (1), the industrial flue gas introduced into the flue gas inlet 1 is saturated flue gas with a temperature of 60°C and a volume flow rate of 200,000 Nm 3 / h, dust content is 35mg / Nm 3 , the flue gas pressure is 200Pa; the volume flow rate of the primary ejection body is 100000Nm 3 / h, the temperature is 20°C, and the pressure is 5000 Pa. After mixing in step (1), the flue gas dew point is reduced to 52°C, and the dry bulb temperature is 58°C.

[0079] In step (2), the secondary cooling air volume flow rate is 50000Nm 3 / h. The pressure is 300pa, and the temperature of the secondary cooling air is 20°C. After mixing in step (2), the flue gas dew point is further reduced to 48°C, and the dry bulb temperature is 55°C.

[0080] In step (4), the hot air pressure is 500 pa, the hot air temperature is 80°C, and the volume flow rate is 50000 Nm 3 / h, the dry bulb temperature of the flue gas after reheating and mixing rises to 62℃.

[0081] Effect data: The dust content in the flue gas discharged from the flue gas outlet is 5mg / Nm 3 It should be noted that in winter, the dry bulb temperature of the flue gas discharged to the atmosphere reaches 62°C, and the dew point drops below 48°C. At an outside temperature of 0°C, there is no white smoke at the outlet of the induced mixed air whitening system. The total condensate discharged by the induced mixed air whitening system is 3.8m 3 / h.

[0082] It can be seen that the use of the induced mixed air white smoke removal system of Example 2 for white smoke removal treatment can achieve the comprehensive effect of white smoke removal and dust removal.

[0083] Application Example 3

[0084] The induced mixed air white smoke elimination system of Example 3 is used to eliminate white smoke from industrial smoke, which includes the following steps:

[0085] (1) Industrial wet flue gas enters the receiving chamber 22 through the flue gas inlet 1, and the primary induced main wind flows out from the nozzle 21 and enters the receiving chamber 22. Due to the turbulent diffusion of the jet, the primary induced main wind in the receiving chamber 22 sucks the surrounding flue gas and generates momentum exchange. The primary induced main wind and the flue gas are mixed in the mixing chamber 23 to exchange momentum and mass.

[0086] (2) The mixed gas is sprayed with droplets through the high-efficiency spray pipe of the spray device 9 in the diffusion chamber 24, forming crystal nuclei for the condensation of water vapor, thereby improving the condensation effect of the flue gas, further reducing the dew point of the flue gas in the system, and precipitating a large amount of condensed water; the condensed water flows into the drainage device 6 at the bottom under the action of gravity;

[0087] (3) A water-removing and liquid-accumulating device 3 is provided at the outlet of the diffusion chamber 24. The water vapor of the mixed gas is precipitated by the demisting process to remove the flue gas condensate, which is then recovered and discharged through the water-removing and liquid-accumulating device 3;

[0088] (4) A demisting and dust removal device 4 is provided at the outlet of the water accumulation removal device 3. The mixed gas after demisting and dust removal is reheated and mixed with hot air through the hot air inlet 8. After mixing, the dry bulb temperature of the flue gas increases and is finally discharged through the flue gas outlet 5.

[0089] In step (1), the industrial flue gas introduced into the flue gas inlet 1 is saturated flue gas with a temperature of 60°C and a volume flow rate of 200,000 Nm 3 / h, dust content is 35mg / Nm 3 , the flue gas pressure is 200Pa; the volume flow rate of the primary ejection body is 100000Nm 3 / h, the temperature is 20°C, and the pressure is 5000 Pa. After mixing in step (1), the flue gas dew point is reduced to 52°C, and the dry bulb temperature is 58°C.

[0090] In step (2), the volume flow rate of the spray liquid is 3m 3 / h. The spraying liquid is cooling water with a temperature of 20°C, and the diameter of the droplets formed by atomization is 10μm to 300μm. After spraying in step (2), the flue gas dew point is further reduced to 46°C, and the dry bulb temperature is 54°C.

[0091] In step (4), the hot air pressure is 400 pa, the hot air temperature is 82°C, and the volume flow rate is 50000 Nm 3 / h, the flue gas dry bulb temperature rises to 64℃ after mixing and reheating.

[0092] Effect data: The dust content in the flue gas discharged from the flue gas outlet is 5mg / Nm 3It should be noted that in winter, the dry bulb temperature of the flue gas discharged to the atmosphere reaches 64°C, and the dew point drops below 49°C. At an outside temperature of 0°C, there is no white smoke in the flue gas outlet of the induced mixed air whitening system. The total condensate discharged by the induced mixed air whitening system is 5.5m 3 / h.

[0093] It can be seen that the use of the induced mixed air white smoke removal system of Example 3 for white smoke removal treatment can achieve the comprehensive effect of white smoke removal and dust removal.

[0094] Application Example 4

[0095] The induced mixed air white smoke elimination system of Example 4 is used to eliminate white smoke from industrial smoke, and the specific steps are the same as those of Application Example 1.

[0096] In step (1), the industrial flue gas introduced into the flue gas inlet 1 is saturated flue gas with a temperature of 65°C and a volume flow rate of 125,000 Nm 3 / h, dust content is 35mg / Nm 3 , the flue gas pressure is 100Pa; the volume flow rate of the primary injection main wind is 75000Nm 3 / h, the temperature is 15°C, and the pressure is 4500 Pa. After mixing in step (1), the flue gas dew point is reduced to 51°C, and the dry bulb temperature is 56°C.

[0097] In step (2), the secondary cooling air volume flow rate is 50000Nm 3 / h, the pressure is 400pa. The temperature of the secondary cooling air is 15°C. After mixing in step (2), the flue gas dew point is further reduced to 45°C, and the dry bulb temperature is 55°C.

[0098] Effect data: The dust content in the flue gas discharged from the flue gas outlet is 8mg / Nm 3 It should be noted that in winter, the dry bulb temperature of the flue gas discharged to the atmosphere reaches 55°C, and the dew point drops below 45°C. At an outside temperature of 0°C, there is no white smoke at the outlet of the induced mixed air whitening system. The total condensate discharged by the induced mixed air whitening system is 2.8m 3 / h.

[0099] It can be seen that the use of the induced mixed air white smoke removal system of Example 4 for white smoke removal treatment can achieve the comprehensive effect of white smoke removal and dust removal.

[0100] Comparative Example 1

[0101] Compared with Example 1, the difference is that the diffusion chamber 24 of the smoke induced mixed air white smoke elimination system in this comparative example is not provided with an air inlet, and no secondary cooling air is introduced during the white smoke elimination process. Other operations and parameters are the same as those in Example 1.

[0102] Performance data:

[0103] The dust content of the flue gas discharged from the flue gas outlet is 8mg / Nm 3 , dew point 48℃, dry bulb temperature 54℃, almost no condensation of flue gas in step (3). At an outside temperature of 0℃, there is a lot of white smoke in the flue gas at the outlet of the induced mixed air whitening system. It can be seen that without secondary cooling air for secondary mixing and spraying droplets, the effect of smoke whitening and dust removal is poor only through primary mixing.

[0104] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A smoke induced mixed air whitening system, characterized in that: It comprises a shell, on which a smoke inlet and a smoke outlet are arranged, and an ejector, a water and liquid removal device and a demisting and dust removal device are arranged in sequence in the shell along the airflow direction; the demisting and dust removal device is connected to the smoke outlet; The ejector comprises a nozzle and a receiving chamber, a mixing chamber and a diffusion chamber arranged in sequence along the airflow direction; the nozzle is the inlet of the primary ejection main air, and the nozzle is arranged in the receiving chamber; the receiving chamber is connected to the smoke inlet; the outlet of the diffusion chamber is connected to the water accumulation device; the diffusion chamber is also provided with a spray device or a plurality of air inlets; the air inlets are the inlet of the secondary cooling air; A drainage device is provided at the bottom of the ejector; A hot air inlet is also provided between the demisting and dust removing device and the smoke outlet, and the hot air inlet is an inlet for hot air.

2. The smoke induced mixed air whitening system according to claim 1 is characterized in that: The number of the air inlets is 1 to 2; And / or, the demisting and dust removing device is a tubular demisting device or a corrugated plate demisting device.

3. The smoke induced mixed air whitening system according to claim 1 is characterized in that: The water accumulation device comprises a bracket, a baffle, a liquid accumulation baffle and a guide tube, wherein the baffle is arranged on the bracket, the liquid accumulation baffle is located at the lower part of the baffle outlet, and the guide tube is connected with the outflow outlet of the liquid accumulation baffle.

4. The smoke induced mixed air whitening system according to claim 1 is characterized in that: A smoke and wind baffle door is provided in front of the nozzle and / or the air inlet.

5. A method for eliminating white smoke using the smoke induced mixed air white smoke elimination system according to any one of claims 1 to 4, characterized in that: include: (1) The smoke enters the receiving chamber through the smoke inlet, the primary induced main wind enters the receiving chamber through the nozzle, and the smoke and the primary induced main wind are mixed in the mixing chamber; (2) the gas mixed in step (1) is sprayed as droplets in the diffusion chamber through the spray device; Alternatively, the gas mixed in step (1) is mixed again in the diffusion chamber by the secondary cooling air; (3) The gas after step (2) is discharged sequentially through the water and liquid removal device, the mist and dust removal device and the smoke outlet; When a hot air inlet is provided between the demisting and dust removing device and the smoke outlet, in step (3), the gas after step (2) passes through the dewatering and liquid accumulation device and the demisting and dust removing device in sequence, and is mixed with the hot air again before being discharged through the smoke outlet; The condensed water precipitated in steps (1) to (3) flows into the drainage device.

6. The method for eliminating white smoke in a smoke induced mixed air white smoke elimination system according to claim 5, characterized in that: The temperature of the flue gas is 55-70°C, the pressure is 50-350Pa, and the volume flow rate is 80000-250000Nm 3 / h.

7. The method for eliminating white smoke in a smoke induced mixed air white smoke elimination system according to claim 5, characterized in that: The pressure of the primary induced main wind is 4000-6000Pa; And / or, the volume flow ratio of the primary induced main wind to the flue gas is (0.2-1.2):

1.

8. The method for eliminating white smoke in a smoke induced mixed air white smoke elimination system according to claim 5, characterized in that: The volume flow ratio of the primary injection main air to the secondary cooling air is 1:(0.2-0.8); And / or, the pressure of the secondary cooling air is 0.1-1000 Pa; And / or, the volume flow rate of the spray medium of the spray device is 1 to 10 m 3 / h; And / or, the diameter of the droplets sprayed by the spraying device is 10 μm to 300 μm.

9. The method for eliminating white smoke in a smoke induced mixed air white smoke elimination system according to claim 5, characterized in that: The temperature of the hot air is 80°C to 150°C; the pressure of the hot air is 100 to 500 Pa; the volume flow ratio of the hot air to the flue gas is (0.2 to 0.5):1.

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