CN211585830U

CN211585830U - Low-temperature wet type flue gas dust and white removing device

Info

Publication number: CN211585830U
Application number: CN201922018870.2U
Authority: CN
Inventors: 章满权; 肖标
Original assignee: TONGLING SANNUO ELECTRONICS CO Ltd
Current assignee: Tongling sannuo Intelligent Technology Co., Ltd
Priority date: 2019-11-21
Filing date: 2019-11-21
Publication date: 2020-09-29
Anticipated expiration: 2029-11-21

Abstract

The utility model discloses a low temperature wet-type flue gas dust removal white device that disappears and method of use thereof, it includes tower type cavity (5) that constitute by lower supreme distribution's water collection section (1), flue gas atomization section (2), flue gas heat transfer section, mixed defogging section (3) and emission section (4), flue gas atomization section intercommunication has flue gas pipeline (6), flue gas heat transfer section including be located tower type cavity both sides with external communicating heat exchanger tube bank (7), heat exchange tube interval vertical distribution in the heat exchanger tube bank, the bottom and the flue gas atomization section intercommunication of heat exchanger tube bank are used for accomodating the flue gas, mixed defogging section is located heat exchanger tube bank top. The beneficial effects of the utility model are that the flue gas is from down and the operation, and natural air moves from the extroversion to the inside, carries out non-contact heat transfer condensation, realizes the collision of steam, adheres to, absorbs and condenses in the flue gas passageway to flow into the district that receives water under the action of gravity along the passageway pipe wall, dust collection efficiency can reach more than 99%, makes the flue gas obtain deep purification, and the white fog disappears.

Description

Low-temperature wet type flue gas dust and white removing device

Technical Field

The utility model relates to an industrial field especially involves flue gas desulfurization dust removal and white device that disappears.

Background

At present, most of the generator sets of coal-fired power plants in China are provided with dust removal and desulfurization devices, wherein the wet desulfurization process accounts for about 90 percent of all the desulfurization devices, and the problems of the existing wet desulfurization system are mainly as follows:

the removal rate of SO3 is low, and is only 40-50%; the removal efficiency of PM2.5 fine dust and aerosol particles is low; wet electric precipitation can remove part of fine dust and aerosol particles, but tailing is more serious; the ammonia desulphurization is one of the mainstream methods for flue gas desulphurization treatment, when the SO2 content of the coal-fired flue gas exceeds 2000mg/m3, the ammonia escape concentration of the process per se is difficult to reach the standard, the problems of ammonia escape and 'thick white smoke' emission generally exist, the smoke plume tailing phenomenon is very obvious, and a large amount of white slurry drops to influence the normal life of the surrounding people.

At present, in order to solve the problems, a wet electric dust removal device and a tube bundle type dust removal device are sequentially added on the desulfurization and denitrification exhaust smoke. However, these techniques can only partially solve dust removal and fog drop, and not only can the white smoke plume and water fog of smoke be solved, but also the water fog and rain fall are more serious.

10000Nm per ton coal burning and fume emission³T, the moisture content of the wet smoke is 112g/Nm³Estimation, per combustion1 ton of wet coal flue gas takes away 1 ton of moisture, which mainly comprises the original moisture in coal, desulphurization and water supplement, 36-37 hundred million tons of coal are consumed in the whole country in 2014, and the moisture brought into the atmosphere by coal-fired flue gas reaches thirty-hundred million tons.

Secondly, natural gas combustion, 1 unit volume of natural gas, will produce 2 times the volume of water vapor. In 2014, the natural gas consumption of China is 1800 billions of cubic meters, 3600 billions of cubic meters of water vapor are generated, and the water vapor is converted into nearly 3 billion tons of water. Only two of these items artificially add-40 million tons of moisture to the atmosphere each year. In addition to other industries such as steel, chemical engineering and the like, the total amount of the haze-removing agent exceeds 50 hundred million tons, and the haze-removing agent is mainly concentrated in economic development areas such as Jingjin Ji, Changjiao and Zhu-jiao, which is also an important reason for severe haze in the areas,

therefore, in order to achieve the aims of deeply purifying and defogging the discharged flue gas after desulfurization and reducing environmental pollution, the problems in the existing desulfurization, denitrification and dedusting are solved, and the task which needs to be completed urgently at present in the technical field is achieved.

At present, the saturated flue gas dehumidification and white elimination technologies for completing wet desulphurization mainly comprise a flue gas direct heating method, a mixed air method, a condensation reheating method and the like. Both the direct heating method and the condensation reheating method require an external heating source to heat the high-humidity flue gas, reduce the humidity of the flue gas to eliminate white smoke, and require a large amount of external heating sources. The heat source added by the heating method white smoke elimination technology needs to be provided by increasing the coal combustion quantity, so that the system has high operation energy consumption, and the added coal combustion quantity can increase pollutant emission. The air mixing method is characterized in that a large amount of ambient air and high-humidity flue gas are mixed, and then the mixed flue gas is reduced to be below saturated humidity, so that unsaturated emission of the flue gas is realized, and white smoke is eliminated. Influenced by the ambient temperature, often need great ambient air volume and desulfurization saturation wet flue gas to mix, it is great that the air mixing device takes up an area of, and mixes the wind fan operation energy consumption higher.

Chinese patent publication No. CN109603546A discloses a sintering flue gas desulfurization, denitrification, dedusting, and whitening purification process, wherein sintering raw flue gas is introduced into a rotary flue gas heat exchanger, exchanges heat with high-temperature sintering flue gas which enters the rotary flue gas heat exchanger after denitrification, the heated sintering raw flue gas is heated to 320 ℃ by a afterburner, ammonia gas is uniformly sprayed into the sintering raw flue gas, and then the sintering raw flue gas enters a denitrification reactor for flue gas denitrification, the high-temperature sintering flue gas after denitrification exchanges heat to the sintering raw flue gas through the rotary flue gas heat exchanger, and then enters an ammonia desulfurization system for cooling, dedusting and desulfurization, and finally deep dedusting and defogging are performed on the desulfurized flue gas.

Chinese patent publication No. CN110152460A discloses a water-saving white smoke eliminating device and method using a chimney sleeve, wherein the device comprises a chimney, a heat exchange pipe grid, a heat taking pump, a desulfurizing tower and a desulfurizing pump; utilize the original telescopic chimney of power plant at the power of pulling out that the process of discharging fume formed, mix the wind to the ambient air and the export flue gas that accomplish the heat transfer intensification, realize that the tail gas does not have the white cigarette and discharges, this patent need rely on desulfurizing tower and chimney cooperation just can accomplish the white operation that disappears, and the flue gas is accomplished to purify in the desulfurizing tower, and the flue gas after the purification mixes the wind with the ambient air of accomplishing the heat transfer intensification in the chimney, and the installation sleeve needs the shut down of production on the chimney, and the cost of manufacture is high, and economic benefits is low.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is that the existing wet flue gas desulfurization dust collector can't handle the "dense white smoke" that the higher flue gas of moisture content produced, provides a low temperature wet flue gas dust removal white device for this reason.

The technical scheme of the utility model is that: low temperature wet-type flue gas dust removal white device that disappears, it includes the tower type cavity that constitutes by lower supreme water collection section, flue gas atomization section, flue gas heat transfer section, mixed defogging section and the section of discharging that distributes, flue gas atomization section intercommunication has flue gas pipeline, flue gas heat transfer section including be located tower type cavity both sides with external communicating heat exchanger tube bank, heat exchange tube interval vertical distribution in the heat exchanger tube bank, the bottom and the flue gas atomization section intercommunication of heat exchanger tube bank are used for accomodating the flue gas, mixed defogging section is located the heat exchanger tube bank top.

The improvement of the scheme is that the top of the heat exchange tube bundle is communicated with an inner wall plate, and the top of the inner wall plate is communicated with the mixed demisting section.

In the scheme, the heat exchange tube bundle is made of graphene.

The further improvement of the scheme is that a plurality of vertically distributed swirl plates are matched in the tube wall of the heat exchange tube bundle.

In the scheme, the spiral-flow plate is spiral.

A further improvement of the scheme is that a flow guide device is arranged between the adjacent cyclone plates.

Another improvement of the above scheme is that the inner wall of the heat exchange tube bundle is provided with a hydrophilic coating.

In the above scheme, an atomization humidifier is arranged in the smoke atomization section.

In the scheme, an induced draft fan is arranged in the discharge section.

The beneficial effects of the utility model are that to remove dust and SOx/NOx control and eliminate outer drainage fog and fuse in an integration processing procedure, effectively improved the suitability and the economic nature of equipment, reached the environmental protection target.

Drawings

FIG. 1 is a schematic view of a low-temperature wet flue gas dedusting and whitening device of the present invention;

in the figure, the device comprises a water collecting section 1, a flue gas atomizing section 2, a mixing demisting section 3, a discharging section 4, a tower-shaped cavity 5, a flue gas conveying pipeline 6, a heat exchange tube bundle 7, an inner wall plate 8, an induced draft fan 9, an induced draft fan 10 and an air heating section.

Detailed Description

The technical solution in the embodiment of the present invention is clearly and completely described below with reference to the accompanying drawings. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments of the ordinary skilled person in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1, the low-temperature wet flue gas dedusting and white-removing device comprises a tower-shaped cavity 5 consisting of a water collecting section 1, a flue gas atomizing section 2, a flue gas heat exchange section, a mixed demisting section 3 and a discharging section 4 which are distributed from bottom to top, wherein the flue gas atomizing section is communicated with a flue gas conveying pipeline 6, the flue gas heat exchange section comprises heat exchange tube bundles 7 which are positioned on two sides of the tower-shaped cavity and communicated with the outside, heat exchange tubes in the heat exchange tube bundles are vertically distributed at intervals, the bottoms of the heat exchange tube bundles are communicated with the flue gas atomizing section to contain flue gas, and the mixed demisting section is positioned at the top end of the.

The water collection section is a closed cavity and is equivalent to a reservoir, and an atomization humidifier is arranged in the smoke atomization section, so that the moisture content of smoke is improved, and the condensation of dust and sol particles in the smoke is promoted. And simultaneously adding alkali liquor (NaOH) to adjust the pH value of the flue gas to be neutral, controlling the pH value to be 7.0-7.5, and analyzing the pH value of the water quality in the water receiving area by adopting an automatic online monitoring instrument. The top of the discharge section is communicated with the outside for discharging purified unsaturated water vapor, the heat exchange tube bundle is a vertical tube body which is transversely arranged, the tube body material can be graphene or a steel tube, and two ends of the tube body are fixed inside the tower-shaped cavity through lining plates. The flue gas is from down to the top operation, moves from outside to inside at flue gas heat transfer section natural air, carries out non-contact heat transfer condensation, and the heat exchange tube bank sets up whirl board and washing device. The collision, adhesion, absorption and condensation of water vapor are realized in the heat exchange tube bundle, and the water vapor flows into the water collecting section along the tube wall under the action of gravity. An induced draft fan 9 is arranged in the discharge section and used for discharging unsaturated water vapor.

The utility model discloses a preferred example is that heat exchanger tube bank top intercommunication has interior wallboard 8, the top and the mixed defogging section intercommunication of interior wallboard have dragged the flue gas after the heat transfer like this and the contact time of intensification air, have just also increased the air volume that air intensification section 10 can hold, have realized mixing the wind in limited space.

The utility model discloses an innovation point lies in utilizing the flue gas in natural wind and the heat exchanger tube bank to carry out the heat transfer, utilize the flue gas to give the natural wind heating, obtain unsaturated vapor by heat exchanger tube bank exhaust low temperature flue gas and intensification air mixing at last, flue gas flux in the heat exchanger tube bank is less than the air content who gets into the air section that heats, ensure that the low temperature flue gas is fully diluted into unsaturated vapor by the air that heaies up, whole process need not to introduce external energy, also need not to realize the process of mixing the wind with the help of external chimney, the white process that disappears is simple high-efficient, both can be used for the transformation of current desulfurizing tower, also can be used for the processing of the flue gas that discharges out through the.

The use method of the low-temperature wet flue gas dedusting and white-removing device comprises the following steps: the flue gas is input into the flue gas atomization section from the flue gas conveying pipeline and is atomized, the atomized flue gas enters the heat exchange tube bundle, meanwhile, external air passes through the heat exchange tube bundle and enters the tower-shaped cavity to form an air temperature rise section, the flue gas is condensed in the heat exchange tube bundle to remove redundant moisture and dust, meanwhile, the flue gas and the air outside the heat exchange tube bundle are subjected to heat exchange, and the flue gas discharged from the top of the heat exchange tube bundle is mixed with the heated air to form unsaturated vapor which is discharged from the discharge section.

The technical process adopted by the utility model is as follows: in one process, a liquid film is formed on the outer surface of the ultrafine particles in the flue gas by a condensation phase-change agglomeration technology, so that the growth of the ultrafine particles is realized; under the actions of gradient agglomeration, thermal agglomeration and turbulent agglomeration, a heat exchange tube bundle and a rotational flow plate structure which are formed by a plurality of heat exchange tubes are adopted to purify and remove ultrafine particles and recycle condensed water; meanwhile, the heat released by the condensation phase change of the flue gas is utilized to improve the air temperature of a cold source and mix with the discharged flue gas, so that the water mist elimination is realized.

The process recovers condensed water in the flue gas while realizing ultra-clean dust removal and water mist elimination, reduces water vapor brought into the atmosphere and reduces the occurrence of haze. The utility model discloses the superfine particulate matter emission control field that the method can be applied to the burning production.

Based on the phase change condensation amplification characteristic of ultrafine dust, the discharged saturated wet flue gas is cooled when meeting cold, the contained vapor is condensed in a phase change manner, meanwhile, a rotational flow process structure which is beneficial to fine particle agglomeration amplification is adopted, the flue gas is under the action of temperature gradient and rotational flow centrifugal force, the particles formed by vapor agglomeration growth move and adhere to the condensation wall surface, the adhesion essence of the vapor, dust and aerosol on the condensation wall surface is realized, the condensed water flows to a water collection section along with a liquid film under the action of gravity and then is collected and purified, and the deep purification of sulfur dioxide and smoke dust in the flue gas is realized.

In the process of recovering the condensed water, the water content of the water vapor is reduced. The water vapor is condensed into liquid from gas state, the heat of vaporization is released to heat the ambient cold air, the water vapor and the dehumidified flue gas are mixed in front of the outlet to form unsaturated water vapor, no vapor fog is formed in the air, and the aim of eliminating the white fog of the discharged flue gas is fulfilled.

Utility model device adopts the multitube condensation heat transfer form, reduces flue gas temperature and makes the fine particle reunion grow up in the flue gas, and the flue gas is at the tube side, and environment cold wind is at the shell side. The heat exchange tube is made of graphene materials, the inner surface of the heat exchange tube is covered with a hydrophilic coating, and condensed water forms a condensed water film surface on the tube side. The pipe is internally provided with a plurality of layers of rotational flow plates for flow guiding. The blades of the rotational flow plate enable the flue gas to form stirring and rotational flow, so that the steam, the smoke dust, the wall of the condensing pipe and condensed and atomized steam liquid drops in the flue gas are collided, attached, condensed, centrifugally separated and the like. Meanwhile, under the action of the temperature gradient, the particles after condensation of the water vapor also tend to move towards the condensation wall surface. The spiral flow plates are spiral, a fluid director is arranged between every two adjacent spiral flow plates, and the inner wall of the heat exchange tube bundle is provided with a hydrophilic coating. The dust and liquid collection adopts the arrangement of a liquid descending channel, the secondary liquid flooding of gas and liquid is reduced through the liquid descending channel, and the liquid descending channel is arranged in the wall of the heat exchange pipe and guides the liquid to fall into the water collection section below. At the mixed defogging section, can set up the blender, intensification environment cold wind mixes formation unsaturated vapor with the flue gas through the dehumidification before the discharge port, does not reduce the flue gas temperature by a wide margin, can not influence the fume emission height, and the flue gas is unsaturated state simultaneously, does not produce the water smoke, reduces energy consumption in the time of the water conservation, has still reduced the influence of flue gas to the haze. The wet condensation deep purification demisting device integrates the technologies into an integrated counting device, SO that the effects of eliminating the water mist of the discharged flue gas and simultaneously removing the heavy metal particles such as SO3 acid mist, NH3 aerosol, PM2.5, liquid drops, mercury and the like are achieved. The utility model discloses can with newly-built desulphurization unit synchronous construction, also can reform transform current desulphurization unit.

Claims

1. The low-temperature wet type flue gas dust and white removal device is characterized in that: it includes tower type cavity (5) that section (1), flue gas atomization section (2), flue gas heat transfer section, mixed defogging section (3) and emission section (4) constitute by lower supreme distribution, flue gas atomization section intercommunication has flue gas pipeline (6), flue gas heat transfer section including be located tower type cavity both sides with external communicating heat exchanger tube bank (7), heat exchange tube interval vertical distribution in the heat exchanger tube bank, the bottom and the flue gas atomization section intercommunication of heat exchanger tube bank are used for accomodating the flue gas, mixed defogging section is located the heat exchanger tube bank top.

2. The low-temperature wet type flue gas dust and white removal device as claimed in claim 1, which is characterized in that: the top of the heat exchange tube bundle is communicated with an inner wall plate (8), and the top of the inner wall plate is communicated with the mixed demisting section.

3. The low-temperature wet type flue gas dust and white removal device as claimed in claim 1, which is characterized in that: the heat exchange tube bundle is made of graphene.

4. The low-temperature wet type flue gas dust and white removal device as claimed in claim 1 or 3, which is characterized in that: and a plurality of vertically distributed rotational flow plates are matched in the tube wall of the heat exchange tube bundle.

5. The low-temperature wet type flue gas dust and white removal device of claim 4, which is characterized in that: the swirl plate is spiral.

6. The low-temperature wet type flue gas dust and white removal device of claim 4, which is characterized in that: a fluid director is arranged between the adjacent rotational flow plates.

7. The low-temperature wet type flue gas dust and white removal device as claimed in claim 1 or 3, which is characterized in that: and a hydrophilic coating is arranged on the inner wall of the heat exchange tube bundle.

8. The low-temperature wet type flue gas dust and white removal device as claimed in claim 1, which is characterized in that: an atomization humidifier is arranged in the smoke atomization section.

9. The low-temperature wet type flue gas dust and white removal device as claimed in claim 1, which is characterized in that: and an induced draft fan (9) is arranged in the discharge section.