Flue gas dedusting device, flue gas emission purification system and method

Abstract

The application discloses a flue gas dust removal device, a flue gas emission purification system and a method. The flue gas emission purification system comprises a heater, a plurality of desulfurization towers and the flue gas dust removal device. The inside of each desulfurization tower is filled with a purification medium. The gas inlets of the desulfurization towers are respectively and selectively connected with the gas outlet of the flue gas dust removal device. The gas outlets of the desulfurization towers are respectively and selectively connected with the regenerative gas outlet of the heater. The regenerative gas inlet of the heater is connected with the outside. The gas outlets of the desulfurization towers are respectively connected with the outside, and are used for discharging the purified flue gas. The gas inlets of the desulfurization towers are respectively connected with the outside, and are used for discharging the desorption gas generated in the desulfurization tower into a subsequent sulfur treatment device. The application solves the technical problem of poor flue gas purification effect caused by coal loading and coke pushing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flue gas purification, further relates to a flue gas dust removal device, a flue gas emission purification system and method, in particular to a coal charging and coke pushing flue gas dust removal device, a flue gas ultra-low emission purification system and method. BACKGROUND

[0002] When the coke oven is charging coal, a large amount of dust-containing flue gas is generated due to the contact between the coal and the hot furnace wall of the coking chamber, which contains impurities such as sulfur dioxide and raw coal gas in addition to dust. In addition, during the process of pushing the coke from the coking chamber by the coke pushing machine, a large amount of flue gas is also generated due to the combustion of the hot coke in contact with air. The dust leakage during the above-mentioned coal charging and coke pushing processes is mostly collected by the dust removal dry pipe and then sent to the ground dust removal station for dust removal treatment before being discharged into the atmosphere. The dust content in the flue gas can be controlled through the ground dust removal station, but the sulfur dioxide therein cannot be removed, so the flue gas directly discharged into the atmosphere after dust removal and purification still causes serious environmental pollution. In order to ensure that the flue gas generated during the coal charging and coke pushing processes of the coke oven meets the emission standard, the flue gas after dust removal must be desulfurized and further purified to ensure that it meets the emission standard.

[0003] The coal charging and coke pushing flue gas is collected and then enters the ground dust removal station for dust removal. The particle concentration after dust removal is still greater than 50mg / m 3 . At present, the commonly used dust removal equipment in industry mainly includes cyclone separator, electrostatic precipitator, bag-type dust collector and wet scrubber, etc. These devices have high total dust removal efficiency, but they have a common defect, i.e. good removal efficiency for particles with large particle size, but poor removal efficiency for micrometer and sub-micrometer particles. The most toxic part of the particles is the micrometer and sub-micrometer particles, which will become the main part of atmospheric particulate pollution after entering the atmosphere, so these particles need to be removed to reduce the particle concentration to less than 10mg / m 3 . The SO2 content in the coal charging and coke pushing flue gas is 45mg / m 3 to 200mg / m 3 . With the strict environmental protection requirements, the SO2 emission limit of flue gas is 30mg / m 3 , the nitrogen oxide emission limit is 50mg / m 3 , and the purified flue gas is discharged. The traditional flue gas desulfurization method mainly adopts calcium method, magnesium method, sodium method, ammonia method and alkali method, etc. Generally speaking, the flue gas desulfurization has the disadvantages of large water consumption, separate treatment of circulating water, high cost, pipeline and equipment corrosion, secondary pollution, etc. At present, there is no more economical and easy method for dust removal and desulfurization of coal charging and coke pushing flue gas. Therefore, it is necessary to develop a coal charging and coke pushing flue gas ultra-low emission purification system and method to make the dust content and SO2 content in the flue gas meet the emission standard.

[0004] The prior art has not yet provided an effective solution to the problem of poor flue gas purification effect caused by coal charging and coke pushing.

[0005] Therefore, the present inventors, based on years of experience and practice in the relevant industry, propose a flue gas dust removal device, a flue gas emission purification system and method to overcome the shortcomings of the prior art. SUMMARY

[0006] The present application aims to provide a flue gas dust removal device, a flue gas emission purification system and method for treating the flue gas generated during coke charging and coke pushing in a coke oven, using a sound wave agglomeration method for deep dust removal, molecular sieve adsorption to remove impurities such as sulfur dioxide in the flue gas generated during coal charging and coke pushing, air heating for regeneration, and the desorption desorption gas after regeneration can be sent to the subsequent desulfurization section for treatment. It has the advantages of small investment, simple process, low cost, recycling of sulfur resources, no secondary pollution, etc. It is a feasible technical route for coal charging and coke pushing flue gas to achieve ultra-low emission.

[0007] The object of the present application can be achieved by using the following technical solutions:

[0008] The present application provides a flue gas dust removal device, wherein a agglomeration chamber for agglomerating dust in flue gas and a dust removal chamber for filtering out agglomerated dust are formed inside the flue gas dust removal device, the agglomeration chamber is in communication with the dust removal chamber, and a gas inlet in communication with the agglomeration chamber and a gas outlet in communication with the dust removal chamber are formed on the flue gas dust removal device.

[0009] A plurality of vibration plates are arranged in the agglomeration chamber, each vibration plate is connected with a first sound wave generator, and a dust removal filter is arranged in the dust removal chamber.

[0010] In a preferred embodiment of the present application, one end of the agglomeration chamber is in communication with the dust removal chamber, the gas inlet is located at the other end of the agglomeration chamber, each vibration plate is arranged along the axial direction of the agglomeration chamber, each first sound wave generator is arranged on the outer wall of the agglomeration chamber, and the first sound wave generator is connected with the corresponding vibration plate.

[0011] In a preferred embodiment of the present application, two adjacent vibration plates are arranged on two opposite inner walls of the agglomeration chamber to form a curved flue gas passage in the agglomeration chamber.

[0012] In a preferred embodiment of the present application, the vibration plates are perpendicular to the axial direction of the agglomeration chamber, and the distance between adjacent vibration plates is equal.

[0013] In a preferred embodiment of the present application, the ratio of the axial length of the agglomeration chamber to the height of the agglomeration chamber is greater than 2:1.

[0014] In a preferred embodiment of the present application, the bottom of the dedusting chamber is provided with a dust hopper, the gas outlet is located at the top of the dedusting chamber, and the dedusting filter is located above the position where the agglomeration chamber communicates with the dedusting chamber.

[0015] In a preferred embodiment of the present application, a plurality of second sound wave generators are arranged on the outer wall of the dedusting chamber.

[0016] In a preferred embodiment of the present application, the first sound wave generator and the second sound wave generator are both adjustable frequency sound wave generators, and the dedusting filter is a plate filter.

[0017] The present application provides a flue gas emission purification system, which comprises a heater, a plurality of desulfurization towers and the above-mentioned flue gas dedusting device, wherein:

[0018] The inside of each of the desulfurization towers is filled with a purification medium, the gas inlet of each of the desulfurization towers is connected to the gas outlet of the flue gas dedusting device in an on-off manner, the gas outlet of each of the desulfurization towers is further connected to the regenerative gas outlet of the heater in an on-off manner, and the regenerative gas inlet of the heater is connected to the outside.

[0019] The gas outlet of each of the desulfurization towers is further connected to the outside for discharging the purified flue gas, and the gas inlet of each of the desulfurization towers is further connected to the outside for introducing the desorption gas generated in the desulfurization tower into the subsequent sulfur treatment device.

[0020] In a preferred embodiment of the present application, the gas inlet of the flue gas dedusting device is connected to a flue gas conveying pipe for conveying the coal charging and coke pushing flue gas, the gas outlet of the flue gas dedusting device is connected to the gas inlet of each of the desulfurization towers in an on-off manner through a flue gas inlet main pipe and a plurality of flue gas inlet branch pipes in sequence, the gas outlet of each of the desulfurization towers is connected to a chimney in an on-off manner through a plurality of clean flue gas outlet branch pipes and a clean flue gas outlet main pipe in sequence, and the gas inlet of each of the desulfurization towers is connected to the subsequent sulfur treatment device in an on-off manner through a plurality of desorption gas outlet branch pipes and a desorption gas outlet main pipe in sequence.

[0021] The regenerative gas outlet of the heater is connected to the gas outlet of each of the desulfurization towers in an on-off manner through a regenerative desorption gas inlet main pipe and a plurality of regenerative desorption gas inlet branch pipes in sequence, the regenerative gas inlet of the heater is connected to the outside or the clean flue gas outlet main pipe in an on-off manner through a first air inlet pipe, and the first air inlet pipe is connected to the regenerative desorption gas inlet main pipe in an on-off manner through a second air inlet pipe.

[0022] In a preferred embodiment of the present application, the first valve is arranged on the flue gas inlet branch pipe, the second valve is arranged on the desorption gas outlet branch pipe, the third valve is arranged on the clean flue gas outlet branch pipe, the fourth valve is arranged on the regenerated desorption gas inlet branch pipe, the fifth valve is arranged on the regenerated desorption gas inlet main pipe, the sixth valve is arranged on the second air inlet pipe, and the seventh valve is arranged on the first air inlet pipe.

[0023] In a preferred embodiment of the present application, the first air inlet pipe is provided with a regeneration fan, and the second air inlet pipe is connected to the first air inlet pipe between the seventh valve and the regeneration fan.

[0024] In a preferred embodiment of the present application, the clean flue gas outlet branch pipe is connected with a diffuser pipe.

[0025] In a preferred embodiment of the present application, the heater is an electric heater or a steam heat exchanger.

[0026] In a preferred embodiment of the present application, the flue gas inlet of the desulfurization tower is located at the lower part of the desulfurization tower, the flue gas outlet of the desulfurization tower is located at the top of the desulfurization tower, and the purification medium is filled between the flue gas inlet of the desulfurization tower and the flue gas outlet of the desulfurization tower.

[0027] In a preferred embodiment of the present application, the purification medium is a molecular sieve material capable of adsorbing harmful gases; the molecular sieve material has adsorption performance in the temperature range of 20-100℃, and can be regenerated by desorption in the temperature range of 160-350℃.

[0028] In a preferred embodiment of the present application, at least one of the desulfurization towers is a standby adsorption tower.

[0029] The present application provides a flue gas emission purification method using the flue gas emission purification system described above, which comprises the following steps:

[0030] Step S1: conveying the coal and coke pushing flue gas after dust removal by the ground dust removal station to the flue gas dust removal device for deep dust removal;

[0031] Step S2: conveying the dust-removed flue gas to the desulfurization tower to adsorb sulfur dioxide and impurities in the flue gas, and the obtained clean flue gas can be directly discharged externally;

[0032] Step S3: after the desulfurization tower adsorption reaches a preset degree, the desulfurization tower is regenerated by using the air or the clean flue gas heated by the heater as the regeneration gas, the desulfurization tower is heated to a set temperature by the regeneration gas and then is kept warm, the adsorbed sulfur dioxide and impurities are desorbed into the desorption gas in the keeping warm process; the heated air or the clean flue gas is cut off, and the desulfurization tower is cooled by using the unheated air or the clean flue gas, so that the regeneration of the desulfurization tower is completed;

[0033] Step S4: the sulfur dioxide and the impurities desorbed in step S3 are introduced into a subsequent sulfur treatment section together with the desorption gas for desulfurization treatment.

[0034] In a preferred embodiment of the present application, the step S1 comprises:

[0035] Step S101: the coal charging and the coke pushing flue gas is agglomerated in the agglomeration chamber to increase the particle size of the dust in the flue gas;

[0036] Step S102: the agglomerated dust particles are filtered in the dust removal chamber.

[0037] In a preferred embodiment of the present application, in the agglomeration chamber, the frequency of the sound wave is 500HZ to 4000HZ, and the sound pressure is 110dB to 150dB.

[0038] In a preferred embodiment of the present application, the residence time of the coal charging and the coke pushing flue gas in the flue gas dust removal device is 2s to 8s, and after passing through the flue gas dust removal device, the dust content in the coal charging and the coke pushing flue gas is less than 10mg / m 3 .

[0039] In a preferred embodiment of the present application, in the step S1, one desulfurization tower is used as a backup, and the remaining desulfurization towers are used to adsorb the coal charging and the coke pushing flue gas.

[0040] In a preferred embodiment of the present application, in the step S2, after the desulfurization tower adsorption reaches a preset degree, the regeneration gas is pressurized by a regeneration fan, the pressure difference is 0.1kPa to 30kPa, the pressure difference between the gas inlet and the gas outlet of the desulfurization tower is less than 4kPa; the regeneration gas is heated to 160℃ to 350℃ by a heater, and then the desulfurization tower is regenerated.

[0041] In a preferred embodiment of the present application, in the step S4, the concentration of sulfur dioxide in the desorption gas is less than or equal to 20g / m 3 , and the subsequent sulfur treatment section performs acid making treatment or alkali spraying treatment on the sulfur dioxide in the desorption gas.

[0042] The features and advantages of the flue gas dust removal device, the flue gas emission purification system and the method of the present application are as follows: before the coal charging and coke pushing flue gas is subjected to desulfurization treatment, the coal charging and coke pushing flue gas is introduced into the flue gas dust removal device, the flue gas is subjected to sound wave agglomeration treatment by the flue gas dust removal device to increase the particle size of dust and deeply remove dust from the flue gas, the flue gas dust removal device has simple structure and high dust removal efficiency, can effectively avoid the problem of equipment corrosion caused by wet dust removal, and can fully filter out the fine particle dust by agglomeration, reduce the dust content entering the subsequent desulfurization section, prolong the service life of the molecular sieve material in the desulfurization tower, and ensure good desulfurization effect. In addition, the sulfur dioxide in the coal charging and coke pushing flue gas can be fully adsorbed by the desulfurization tower, and the adsorbed sulfur dioxide can be desorbed and discharged by heating, the desorption gas has small gas volume and high sulfur content, and the sulfur dioxide and the desorption gas can be subjected to subsequent treatment such as acid making or alkali adding, which has low cost and small energy consumption. The purified flue gas meets the emission standard, the sulfur resource is recycled and utilized, energy is saved, there is no secondary pollution, the technical effects of efficient dust removal and desulfurization of the coal charging and coke pushing flue gas are achieved, and the present application is suitable for popularization and use. BRIEF DESCRIPTION OF DRAWINGS

[0043] The following drawings are only intended to illustrate and explain the present application and do not limit the scope of the present application.

[0044] Among them:

[0045] Figure 1 : is a structural schematic view of the flue gas emission purification system of the present application.

[0046] Figure 2 : is a structural schematic view of the flue gas dust removal device of the present application.

[0047] Figure 3 : is a connection schematic view of the desulfurization tower in the flue gas emission purification system of the present application.

[0048] Figure 4 : is a connection schematic view of the heater in the flue gas emission purification system of the present application.

[0049] The reference signs in the present application are as follows:

[0050] 1, desulfurization tower; 2, flue gas inlet main pipe;

[0051] 201, flue gas inlet branch pipe; 3, flue gas dust removal device;

[0052] 301, agglomeration chamber; 302, dust removal chamber;

[0053] 303, first sound wave generator; 304, vibration plate;

[0054] 305. Dust filter; 306. Second acoustic wave generator;

[0055] 307. Ash hopper; 4. Heater;

[0056] 5. Regeneration fan; 6. Flue gas conveying pipe;

[0057] 7. Main flue gas outlet pipe; 701. Branch flue gas outlet pipe;

[0058] 8. Regeneration desorption gas inlet main pipe; 801. Regeneration desorption gas inlet branch pipe;

[0059] 9. Desorption / desorption gas outlet main pipe; 901. Desorption / desorption gas outlet branch pipe;

[0060] 10. Chimney; 11. First air intake pipe;

[0061] 12. Second air intake pipe; 13. Sulfur treatment unit;

[0062] V1, First valve; V2, Second valve;

[0063] V3, the third valve; V4, the fourth valve;

[0064] V5, the fifth valve; V6, the sixth valve;

[0065] V7, the seventh valve. Detailed Implementation

[0066] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0067] Implementation Method 1

[0068] like Figure 2 As shown, the present invention provides a flue gas dust removal device, which has an internally connected agglomeration chamber 301 and a dust removal chamber 302. The agglomeration chamber 301 is used to agglomerate dust in the flue gas, and the dust removal chamber 302 is used to filter out the agglomerated dust particles. The flue gas dust removal device has an air inlet communicating with the agglomeration chamber 301 and an air outlet communicating with the dust removal chamber 302. A plurality of vibrating plates 304 are provided in the agglomeration chamber 301, and each vibrating plate 304 is connected to a first sound wave generator 303. A dust removal filter 305 is provided in the dust removal chamber 302.

[0069] The first sound wave generator 303 in the application transmits sound waves into the agglomeration chamber 301 through the vibration plate 304, and the small particles of dust in the flue gas vibrate under the action of the sound waves and agglomerate into large particles of dust. 3 The fine particles of dust can be fully filtered out by agglomeration, achieving good dust removal effect.

[0070] In an optional embodiment of the application, as shown in Figure 2 One end of the agglomeration chamber 301 is in communication with the dust removal chamber 302, and the gas inlet is located at the other end of the agglomeration chamber 301.

[0071] Further, as shown in Figure 2 The adjacent two vibration plates 304 are arranged on the two opposite inner walls of the agglomeration chamber 301 to form a curved flue gas passage in the agglomeration chamber 301, thereby prolonging the flow path of the flue gas in the agglomeration chamber 301 and improving the agglomeration effect of the dust.

[0072] Specifically, as shown in Figure 2 The vibration plate 304 is perpendicular to the axial direction of the agglomeration chamber 301, and the distance between the adjacent two vibration plates 304 is equal.

[0073] Further, the ratio of the axial length of the agglomeration chamber 301 to the height of the agglomeration chamber 301 is greater than 2:1, and the flow of the flue gas in the agglomeration chamber 301 is turbulent.

[0074] In an optional embodiment of the application, as shown in Figure 2 The dust hopper 307 is arranged at the bottom of the dust removal chamber 302, and the gas outlet is located at the top of the dust removal chamber 302.

[0075] Further, as shown in Figure 1 to Figure 4As shown, a plurality of second sound wave generators 306 are arranged on the outer wall of the dust removal chamber 302, which can vibrate the dust particles attached to the dust removal filter 305 and the inner wall of the dust removal chamber 302 on the one hand, so that the dust particles fall off; on the other hand, the second sound wave generators 306 can further promote the agglomeration effect of the dust, so that the dust is further agglomerated and increased, and falls into the dust hopper 307.

[0076] Further, the first sound wave generator 303 and the second sound wave generator 306 are adjustable frequency sound wave generators; and the dust removal filter 305 is a plate filter.

[0077] The smoke dust removal device has the following characteristics and advantages:

[0078] The smoke dust removal device adopts a sound wave agglomeration method for deep dust removal, has a simple structure and high dust removal efficiency, can effectively avoid the corrosion problem of equipment caused by wet dust removal, prolongs the service life of the equipment, and can remove fine dust particles to ensure good dust removal effect.

[0079] Embodiment two

[0080] As shown in Figure 1 to Figure 4 The present application provides a smoke emission purification system, which comprises a heater 4, a plurality of desulfurization towers 1 and the above-mentioned smoke dust removal device 3, wherein: each desulfurization tower 1 is provided with a filler layer, and the filler layer is filled with a purification medium; the gas inlet of each desulfurization tower 1 is connected to the gas outlet of the smoke dust removal device 3 in an on-off manner; the gas outlet of each desulfurization tower 1 is further connected to the regenerative gas outlet of the heater 4 in an on-off manner; the regenerative gas inlet of the heater 4 is connected to the outside; the gas outlet of each desulfurization tower 1 is further connected to the outside, for discharging the purified smoke to the outside; and the gas inlet of each desulfurization tower 1 is further connected to the outside, for discharging the desorption gas generated in the desulfurization tower 1 to the subsequent sulfur treatment device 13.

[0081] The coal charging and coke pushing flue gas is passed into the flue gas dust removal device 3 before desulfurization treatment, and the flue gas is subjected to acoustic agglomeration treatment by the flue gas dust removal device 3, so as to increase the particle size of dust and deeply remove dust from the flue gas. The flue gas dust removal device has simple structure and high dust removal efficiency, can effectively avoid the problem of equipment corrosion caused by wet dust removal, and can agglomerate fine particle dust by agglomeration, so as to reduce the dust content entering the subsequent desulfurization section, prolong the service life of the molecular sieve material in the desulfurization tower, and ensure good desulfurization effect. In addition, the sulfur dioxide in the coal charging and coke pushing flue gas can be fully adsorbed by the desulfurization tower 1, and the adsorbed sulfur dioxide can be desorbed and discharged by heating. The desorption gas has small gas volume and high sulfur content, and the sulfur dioxide and the desorption gas can be subjected to subsequent treatment such as acid production or alkali addition. The cost is low, the energy consumption is small, the purified flue gas meets the emission standard, the sulfur resource is recycled and utilized, the energy is saved, there is no secondary pollution, and the technical effects of efficient dust removal and desulfurization of the coal charging and coke pushing flue gas are achieved.

[0082] Further, at least one of the desulfurization towers 1 is a standby adsorption tower.

[0083] Specifically, as shown in Figure 1 the gas inlet of the flue gas dust removal device 3 is connected with the flue gas conveying pipe 6 conveying the coal charging and coke pushing flue gas, the gas outlet of the flue gas dust removal device 3 is connected with the gas inlets of the corresponding desulfurization towers 1 through the flue gas inlet main pipe 2 and the multiple flue gas inlet branch pipes 201 in sequence in a switchable manner, the gas outlets of the desulfurization towers 1 are connected with the chimney 10 through the corresponding multiple clean flue gas outlet branch pipes 701 and the clean flue gas outlet main pipe 7 in sequence in a switchable manner, the gas inlets of the desulfurization towers 1 are connected with the subsequent sulfur treatment device 13 through the corresponding multiple desorption gas outlet branch pipes 901 and the desorption gas outlet main pipe 9 in a switchable manner, the regeneration gas outlet of the heater 4 is connected with the gas outlets of the corresponding desulfurization towers 1 through the regeneration desorption gas inlet main pipe 8 and the multiple regeneration desorption gas inlet branch pipes 801 in a switchable manner, the regeneration gas inlet of the heater 4 is connected with the outside or the clean flue gas outlet main pipe 7 through the first air inlet pipe 11 in a switchable manner, and the first air inlet pipe 11 is connected with the regeneration desorption gas inlet main pipe 8 through the second air inlet pipe 12 in a switchable manner.

[0084] Specifically, as shown in Figure 1As shown, the flue gas inlet branch pipe 201 is provided with a first valve V1, the desorption gas outlet branch pipe 901 is provided with a second valve V2, the clean flue gas outlet branch pipe 701 is provided with a third valve V3, the regeneration desorption gas inlet branch pipe 801 is provided with a fourth valve V4, the regeneration desorption gas inlet main pipe 8 is provided with a fifth valve V5, the second air inlet pipe 12 is provided with a sixth valve V6, and the first air inlet pipe 11 is provided with a seventh valve V7. The regeneration blower 5 is arranged on the first air inlet pipe 11, and the second air inlet pipe 12 is connected to the first air inlet pipe 11 between the seventh valve V7 and the regeneration blower 5. The delivery of the regeneration gas is pressurized by the regeneration blower 5, and the on-off of the corresponding pipelines is controlled by controlling the opening and closing states of the valves, so as to complete the desulfurization and dust removal of the flue gas.

[0085] Each valve can be, but is not limited to, a gate valve, a butterfly valve, or a blind plate valve. The starting mode of each valve is one or a combination of multiple forms of manual, pneumatic, and electric.

[0086] Further, the regeneration blower 5 has a variable frequency regulation function.

[0087] Specifically, as shown in Figure 3 、 Figure 1 The inlet of the desulfurization tower 1 is located at the lower part of the desulfurization tower 1, the outlet of the desulfurization tower 1 is located at the top of the desulfurization tower 1, and the purification medium is filled between the inlet of the desulfurization tower 1 and the outlet of the desulfurization tower 1. The coal and the coke pushing flue gas after deep dust removal enter the desulfurization tower 1 from the inlet at the lower part of the desulfurization tower 1, pass through the purification medium from bottom to top, and the sulfur dioxide and impurities in the flue gas are fully adsorbed by the purification medium. The purified flue gas is discharged through the outlet at the top of the desulfurization tower 1.

[0088] Further, the packing layer is provided with a temperature detection device and a pressure detection device. The temperature detection device can be used to detect the temperature of the purification medium in real time, and the temperature of the packing layer can be adjusted as needed to ensure that the purification medium is in a suitable temperature environment. The pressure detection device can be used to detect the pressure in the packing layer in real time.

[0089] The temperature detection device can be, but is not limited to, a temperature sensor, and the pressure detection device can be, but is not limited to, a pressure sensor.

[0090] In the present application, the purification medium is a molecular sieve material capable of adsorbing harmful gases (i.e. sulfur dioxide and benzopyrene impurities), with a service life of 7 to 10 years, capable of repeated regeneration and resistant to high temperatures. The molecular sieve material has adsorption performance in the temperature range of 20°C to 100°C, and can be regenerated by desorption in the temperature range of 160°C to 350°C. The molecular sieve material can be selected from X-type molecular sieve, Y-type molecular sieve, A-type molecular sieve, ZSM-type molecular sieve, mordenite, β-type molecular sieve, MCM-type molecular sieve and / or SAPO-type molecular sieve.

[0091] Further, the clean flue gas outlet branch pipe 701 is connected with a diffusion pipe.

[0092] Further, the heater 4 can be, but is not limited to, an electric heater or a steam heat exchanger.

[0093] Further, the sulfur treatment device 13 can be, but is not limited to, an acid making device or an alkali spraying treatment device.

[0094] The basic working principle of the present application is that the coal charging flue gas and the coke pushing flue gas (flue gas volume greater than 50,000 m 3 / h) are mixed into the flue gas conveying pipe 6 after dust removal by the respective ground dust removal stations and enter the flue gas dust removal device 3. The content of sulfur dioxide in the coal charging and coke pushing flue gas is 45 mg / m 3 to 200 mg / m 3 , the content of dust is less than 50 mg / m 3 , and the temperature of the flue gas is less than 100°C. After deep dust removal by the flue gas dust removal device 3 (the frequency of the sound wave is 500 Hz to 4000 Hz, the sound pressure is 110 dB to 150 dB, and the residence time of the flue gas in the flue gas dust removal device 3 is 2 s to 8 s), the content of dust in the flue gas is reduced to less than 10 mg / m 3 . The flue gas after deep dust removal is conveyed to the desulfurization tower 1, which is filled with molecular sieve material. The sulfur dioxide and benzopyrene impurities in the flue gas are adsorbed by the molecular sieve material in the desulfurization tower 1. The content of sulfur dioxide in the flue gas after adsorption is less than 30 mg / m 3 . The flue gas is sequentially conveyed to the chimney 10 through the clean flue gas outlet main pipe 7 and the clean flue gas outlet branch pipe 701. The number of desulfurization towers 1 is greater than or equal to 2, and at least one is a standby desulfurization tower 1. The molecular sieve material filled in the desulfurization tower 1 has adsorption capacity at a temperature of 20°C to 100°C, and can be regenerated by desorption at a temperature of 160°C to 350°C. When all the desulfurization towers 1 reach the preset saturation threshold, the standby desulfurization tower 1 is started to regenerate the desulfurization tower 1 that has reached the saturation threshold. The regeneration operation is that the regeneration fan 5 extracts air through the first air inlet pipe 11 or a small amount of clean flue gas from the clean flue gas outlet main pipe 7 (the extraction amount of air or clean flue gas is 1000 Nm3 / h to 10000 Nm 3 / h), and is heated to 160-350 DEG C by the heater 4, and then enters the desulfurization tower 1 through the regenerative desorption gas inlet main pipe 8 and the regenerative desorption gas inlet branch pipes 801 in sequence. The regeneration process of the desulfurization tower 1 is divided into three processes of temperature rising, temperature keeping and cold blowing (the cold blowing medium is air), and the regeneration time of each adsorption tower 1 is about 60 hours. During the regeneration process, the molecular sieve material desorbs the adsorbed sulfur dioxide and impurities into the desorption gas (at this time, the content of sulfur dioxide in the desorption gas is 20 mg / m 3 ), and generally, the regeneration process needs 1-5 days, preferably 3 days. The desorbed desorption gas in the desulfurization tower 1 enters the subsequent acid making or alkali spraying section through the desorption gas outlet branch pipes 901 and the desorption gas outlet main pipe 9 in sequence. At this time, the regeneration blower 5 extracts a large amount of air or a large amount of clean flue gas from the clean flue gas outlet main pipe 7, and enters the desulfurization tower 1 through the first air inlet pipe 11, the second air inlet pipe 12, the regenerative desorption gas inlet main pipe 8 and the regenerative desorption gas inlet branch pipes 801 in sequence to perform cold blowing, so that the temperature in the desulfurization tower 1 is reduced to 20-100 DEG C, and the cold blowing process is completed.

[0095] The features and advantages of the flue gas emission purification system of the present application are as follows:

[0096] I. The flue gas emission purification system uses the sound wave agglomeration method to deeply remove dust in the flue gas, has simple device and high dust removal efficiency, and can avoid the equipment corrosion problem caused by wet dust removal.

[0097] II. The purification medium in the desulfurization tower 1 of the flue gas emission purification system can adsorb sulfur dioxide and impurities, and can be regenerated by heating through air or purified flue gas. The desorption gas amount is small, the sulfur concentration after desorption is high, the subsequent treatment equipment scale is small, the investment is less, and the energy consumption is low.

[0098] III. The flue gas emission purification system performs acid making or alkali spraying treatment on the desorption gas containing high-concentration sulfur dioxide, the flue gas can be discharged up to the standard, the sulfur resource is recycled, energy is saved, and there is no secondary pollution.

[0099] IV. The flue gas emission purification system solves the problem that the traditional dry dust removal facility cannot fully remove the fine dust, greatly reduces the dust content of the flue gas entering the subsequent desulfurization section, and improves the service life of the molecular sieve and the adsorption effect of sulfur dioxide and impurities.

[0100] Embodiment three

[0101] The present application provides a flue gas emission purification method using the above flue gas emission purification system, which comprises the following steps:

[0102] Step S1: the coal loading and coke pushing flue gas after dust removal by the ground dust removal station is transported into the flue gas dust removal device 3 for deep dust removal;

[0103] Step S2: the dust-removed flue gas is transported into the desulfurization tower 1 to adsorb sulfur dioxide and impurities in the flue gas, and the obtained clean flue gas can be directly discharged externally;

[0104] Step S3: after the desulfurization tower 1 reaches the preset degree of adsorption, the air or clean flue gas heated by the heater 4 is used as the regeneration gas to regenerate the desulfurization tower 1, and after the desulfurization tower 1 is heated and warmed to the set temperature by the regeneration gas, the desorption gas is desorbed; the heated air or clean flue gas is cut off, and the desulfurization tower 1 is cooled by unheated air or clean flue gas, and the regeneration of the desulfurization tower 1 is completed;

[0105] Step S4: the desorbed sulfur dioxide and impurities in step S3 are introduced into the subsequent sulfur treatment section along with the desorption gas for desulfurization treatment.

[0106] Further, step S1 includes:

[0107] Step S101: agglomeration treatment is performed on the coal loading and coke pushing flue gas in the agglomeration chamber 301 to increase the particle size of the dust in the flue gas;

[0108] Step S102: the agglomerated dust particles are filtered out in the dust removal chamber 302.

[0109] Further, in the agglomeration chamber 301, the frequency of the sound wave is 500-4000 Hz, and the sound pressure is 110-150 dB.

[0110] Further, the residence time of the coal loading and coke pushing flue gas in the flue gas dust removal device 3 is 2-8 s, and after passing through the flue gas dust removal device 3, the dust content in the coal loading and coke pushing flue gas is less than 10 mg / m 3 .

[0111] Further, in step S1, one desulfurization tower 1 is used as a backup, and the remaining desulfurization towers 1 are used to adsorb the coal loading and coke pushing flue gas.

[0112] Further, in step S2, after the desulfurization tower 1 reaches the preset degree of adsorption, the regeneration fan 5 is used to pressurize the regeneration gas to a differential pressure of 0.1-30 kPa, and the pressure difference between the gas inlet and the gas outlet of the desulfurization tower 1 is less than 4 kPa; the heater 4 is used to heat the regeneration gas to 160-350°C to regenerate the desulfurization tower 1.

[0113] Further, in step S4, the concentration of sulfur dioxide in the desorption gas is less than or equal to 20 g / m3 The subsequent sulfur treatment section will treat the sulfur dioxide in the desorbed gas by acid production or alkali spraying.

[0114] A specific embodiment of the present invention is as follows: ​ As shown, the coal charging flue gas and coke pushing flue gas are respectively dusted by their respective ground dust removal stations, then mixed into the flue gas conveying pipe 6 and transported to the flue gas dust removal device 3. The maximum flue gas flow rate is 300,000 Nm³. 3 / h, the sulfur dioxide content in the flue gas is less than 200mg / m³ 3 The flue gas pressure is 4 kPa, and the dust content in the flue gas is less than 50 mg / m³. 3 The flue gas temperature is 80℃ to 100℃. Each first sound wave generator 303 transmits sound waves to the agglomeration chamber 301 via a vibrating plate 304. The sound wave frequency in the agglomeration chamber 301 is 2000Hz. The dust in the flue gas vibrates under the action of the sound waves, causing the flue gas to flow turbulently within the agglomeration chamber 301. Small dust particles agglomerate into larger particles. These larger dust particles are intercepted by the dust filter 305 in the dust removal chamber 302 and fall into the ash hopper 307 for discharge. After deep dust removal by the flue gas dust removal device 3, the dust content in the flue gas is less than 10mg / m³. 3 At this time, the desulfurization tower 1 at the very end serves as a backup desulfurization tower 1. The first valve V1 and the third valve V3 of the other desulfurization towers 1 are opened, while the other valves remain closed. The flue gas, after deep dust removal, sequentially enters each desulfurization tower 1 through the main flue gas inlet pipe 2, each flue gas inlet branch pipe 201, and the inlet of each desulfurization tower 1. As the flue gas passes through the packing layer in the desulfurization tower 1, sulfur dioxide and impurities such as benzo[a]pyrene are adsorbed by the packed molecular sieve material. The sulfur dioxide content in the purified flue gas is less than 30 mg / m³. 3 The clean flue gas obtained is discharged from the outlet of desulfurization tower 1 into the clean flue gas outlet branch pipe 701. All clean flue gas outlet branch pipes 701 converge into the clean flue gas outlet main pipe 7, and then are sent to the chimney 10 for emission. After 3 days of operation, the first valve V1 and the third valve V3 of the standby desulfurization tower 1 are opened, and the first valve V1 and the third valve V3 of the foremost desulfurization tower 1 are closed to regenerate the foremost desulfurization tower 1. Simultaneously, the regeneration fan 5 is started, and the seventh valve V7 and the fourth valve V4 corresponding to the foremost desulfurization tower 1 are opened. The regeneration fan 5 draws in air at a flow rate of 3000 Nm³. 3 / h, the regenerated air is pressurized by 10 kPa by the regenerative fan 5, and after being heated by the heater 4, enters the desulfurization tower 1 at the front end through the regenerative desorption gas inlet main pipe 8, the regenerative desorption gas inlet branch pipe 801 and the gas outlet of the desulfurization tower 1 at the front end in sequence. The regenerative desorption gas in the desulfurization tower 1 heats the filler layer when passing through the filler layer. The filler layer is provided with a temperature detection device, so that the change of the temperature of the filler layer can be detected in real time. When the temperature of the filler layer reaches 200℃, heat preservation is carried out, and the temperature is maintained at 180-210℃. At this time, the sulfur dioxide and impurities such as benzopyrene adsorbed by the molecular sieve material are desorbed, and enter the regenerative air after desorption, which is called desorption desorption gas. The content of sulfur dioxide in the desorption desorption gas is 20 g / m 3 The desorption desorption gas in the desulfurization tower 1 at the front end is transported to the acid making section through the desorption desorption gas outlet branch pipe 901 and the desorption desorption gas outlet main pipe 9 in sequence to make acid. After the heat preservation and desorption of the desulfurization tower 1 at the front end lasts for one day, the desulfurization tower 1 is cooled. The fifth valve V5 and the seventh valve V7 are closed, and the sixth valve V6 is opened. Air enters the desulfurization tower 1 at the front end through the second air inlet pipe 12, the regenerative desorption gas inlet main pipe 8 and the regenerative desorption gas inlet branch pipe 801 in sequence to cool. After the cooling process is completed, the next desulfurization tower 1 can be regenerated. When it is necessary to start the regeneration of the next desulfurization tower 1, the sixth valve V6, the fourth valve V4 corresponding to the desulfurization tower 1 at the front end and the second valve V2 are closed, and the first valve V1 and the third valve V3 corresponding to the desulfurization tower 1 at the front end are opened. The first valve V1 and the third valve V3 corresponding to the next desulfurization tower 1 are closed. The desorption and regeneration process of the next desulfurization tower 1 is the same as the above process.

[0115] In another specific embodiment of the present application, five desulfurization towers 1 are used, one of which is used as a standby. The inner diameter of each desulfurization tower 1 is 5.6 m, and 500 m 3 of adsorption material are filled in each desulfurization tower 1. Each desulfurization tower 1 is cycled for adsorption and regeneration according to the above process.

[0116] The characteristics and advantages of the flue gas emission purification method of the present application are:

[0117] The flue gas emission purification method carries out acoustic agglomeration treatment on the coal charging and coke pushing flue gas to increase the particle size of dust and deeply remove dust, is simple to operate, has high dust removal efficiency, can effectively avoid the equipment corrosion problem caused by wet dust removal, can fully filter out the fine particle dust through agglomeration, reduces the dust content entering the subsequent desulfurization section, improves the desulfurization effect, and ensures the service life of the desulfurization equipment. In addition, the sulfur dioxide in the coal charging and coke pushing flue gas can be fully adsorbed by the molecular sieve material, and the molecular sieve material can desorb and discharge the adsorbed sulfur dioxide by heating, the desorption gas amount is small, the sulfur content is high, and the sulfur dioxide and the desorption gas can be subjected to subsequent treatment such as acid making or alkali adding, the cost is low, the energy consumption is small, the purified flue gas meets the emission standard, the sulfur resource is recycled and utilized, energy is saved, there is no secondary pollution, and the method is suitable for popularization and use.

[0118] The above merely illustrates the specific embodiments of the present application, and is not intended to limit the scope of the present application. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present application shall fall within the scope of the present application.

Claims

1. A flue gas emission purification system, characterized in that, The flue gas emission purification system includes a heater (4), multiple desulfurization towers (1), and a flue gas dust removal device (3), wherein: The flue gas dust removal device has an agglomeration chamber (301) for agglomerating dust in the flue gas and a dust removal chamber (302) for filtering out the agglomerated dust. The agglomeration chamber (301) and the dust removal chamber (302) are connected. The flue gas dust removal device has an air inlet connected to the agglomeration chamber (301) and an air outlet connected to the dust removal chamber (302). The agglomeration chamber (301) is provided with a plurality of vibrating plates (304), each of the vibrating plates (304) being connected to a first sound wave generator (303). The dust removal chamber (302) is provided with a dust removal filter (305), and a plurality of second sound wave generators (306) are provided on the outer wall of the dust removal chamber (302). One end of the agglomeration chamber (301) is connected to the dust removal chamber (302), the air inlet is located at the other end of the agglomeration chamber (301), each of the vibration plates (304) is arranged at intervals along the axial direction of the agglomeration chamber (301), each of the first sound wave generators (303) is disposed on the outer wall of the agglomeration chamber (301), and the first sound wave generator (303) is connected to the corresponding vibration plate (304); The two adjacent vibrating plates (304) are respectively disposed on the two opposite inner walls of the agglomeration chamber (301) to form a bent flue gas passage in the agglomeration chamber (301); The ratio of the axial length of the agglomeration chamber (301) to the height of the agglomeration chamber (301) is greater than 2:1; Each of the desulfurization towers (1) is filled with a purification medium. The air inlet of each desulfurization tower (1) is connected to the air outlet of the flue gas dust removal device (3) in a switchable manner. The flue gas dust removal device (3) uses sound waves with a frequency of 500HZ to 4000HZ and a sound pressure of 110dB to 150dB to remove dust from the flue gas, so as to reduce the dust content in the flue gas with a residence time of 2s to 8s in the flue gas dust removal device (3) to less than 10mg / m³. 3 ; The outlet of each of the desulfurization towers (1) is also connected to the regeneration gas outlet of the heater (4) in a switchable manner, and the regeneration gas inlet of the heater (4) is connected to the outside. The outlet of each of the desulfurization towers (1) is also connected to the outside to discharge the purified flue gas to the outside; the inlet of each of the desulfurization towers (1) is also connected to the outside to pass the desorption gas generated in the desulfurization tower (1) into the subsequent sulfur treatment device (13).

2. The flue gas emission purification system as described in claim 1, characterized in that, The vibrating plate (304) is perpendicular to the axis of the agglomeration chamber (301), and the distance between two adjacent vibrating plates (304) is equal.

3. The flue gas emission purification system as described in claim 1, characterized in that, The bottom of the dust removal chamber (302) is provided with a dust hopper (307), the air outlet is located at the top of the dust removal chamber (302), and the dust filter (305) is located above the position where the agglomeration chamber (301) communicates with the dust removal chamber (302).

4. The flue gas emission purification system as described in claim 1, characterized in that, Both the first acoustic wave generator (303) and the second acoustic wave generator (306) are frequency-adjustable acoustic wave generators; the dust filter (305) is a plate filter.

5. The flue gas emission purification system as described in claim 1, characterized in that, The inlet of the flue gas dust removal device (3) is connected to the flue gas conveying pipe (6) for conveying coal charging and coke pushing flue gas. The outlet of the flue gas dust removal device (3) is connected to the inlet of each of the corresponding desulfurization towers (1) in turn via the flue gas inlet main pipe (2) and multiple flue gas inlet branch pipes (201). The outlet of each desulfurization tower (1) is connected to the chimney (10) in turn via multiple clean flue gas outlet branch pipes (701) and clean flue gas outlet main pipe (7). The inlet of each desulfurization tower (1) is connected to the subsequent sulfur treatment device (13) in turn via multiple desorption and desorption gas outlet branch pipes (901) and desorption and desorption gas outlet main pipe (9). The regeneration gas outlet of the heater (4) is connected to the outlet of each of the corresponding desulfurization towers (1) in a slew-free manner via a regeneration desorption gas inlet main pipe (8) and multiple regeneration desorption gas inlet branch pipes (801). The regeneration gas inlet of the heater (4) is connected to the external or clean flue gas outlet main pipe (7) in a slew-free manner via a first air inlet pipe (11). The first air inlet pipe (11) is connected to the regeneration desorption gas inlet main pipe (8) in a slew-free manner via a second air inlet pipe (12).

6. The flue gas emission purification system as described in claim 5, characterized in that, A first valve (V1) is provided on the flue gas inlet branch pipe (201), a second valve (V2) is provided on the desorption gas outlet branch pipe (901), a third valve (V3) is provided on the clean flue gas outlet branch pipe (701), a fourth valve (V4) is provided on the regeneration desorption gas inlet branch pipe (801), a fifth valve (V5) is provided on the regeneration desorption gas inlet main pipe (8), a sixth valve (V6) is provided on the second air inlet pipe (12), and a seventh valve (V7) is provided on the first air inlet pipe (11).

7. The flue gas emission purification system as described in claim 6, characterized in that, A regeneration fan (5) is provided on the first air intake pipe (11), and the second air intake pipe (12) is connected to the first air intake pipe (11) between the seventh valve (V7) and the regeneration fan (5).

8. The flue gas emission purification system as described in claim 5, characterized in that, A vent pipe is connected to the clean flue gas outlet branch pipe (701).

9. The flue gas emission purification system as described in claim 1, characterized in that, The heater (4) is an electric heater or a steam heat exchanger.

10. The flue gas emission purification system as described in claim 1, characterized in that, The air inlet of the desulfurization tower (1) is located at the lower part of the desulfurization tower (1), and the air outlet of the desulfurization tower (1) is located at the top of the desulfurization tower (1). The purification medium is filled between the air inlet and the air outlet of the desulfurization tower (1).

11. The flue gas emission purification system as described in claim 1, characterized in that, The purification medium is a molecular sieve material capable of adsorbing harmful gases; the molecular sieve material has adsorption properties in the temperature range of 20°C to 100°C and can be desorbed and regenerated in the temperature range of 160°C to 350°C.

12. The flue gas emission purification system as described in claim 1, characterized in that, At least one of the desulfurization towers (1) is a standby adsorption tower.

13. A method for purifying flue gas emissions, characterized in that, The flue gas emission purification method utilizes the flue gas emission purification system according to any one of claims 1 to 12, and includes the following steps: Step S1: The coal loading and coke pushing flue gas after being dusted by the ground dust removal station is transported to the flue gas dust removal device (3) for deep dust removal; Step S101: Agglomerate the coal charging and coke pushing flue gas in the agglomeration chamber (301) to increase the particle size of dust in the flue gas; Step S102: Filter out the agglomerated dust particles in the dust removal chamber (302); Within the agglomeration chamber (301), the frequency of the sound waves is 500 Hz to 4000 Hz, and the sound pressure is 110 dB to 150 dB. The residence time of the coal charging and coke pushing flue gas in the flue gas dust removal device (3) is 2 s to 8 s. After passing through the flue gas dust removal device (3), the dust content in the coal charging and coke pushing flue gas is less than 10 mg / m³. 3 ; Step S2: The flue gas after dust removal is transported to the desulfurization tower (1) to adsorb sulfur dioxide and impurities in the flue gas. The resulting clean flue gas can be discharged directly to the outside. Step S3: After the desulfurization tower (1) has reached the preset adsorption level, the air or clean flue gas heated by the heater (4) is used as the regeneration gas to regenerate the desulfurization tower (1). After the desulfurization tower (1) is heated to the set temperature by the regeneration gas, it is kept warm. During the heat preservation process, the adsorbed sulfur dioxide and impurities are desorbed into the desorption gas. The heated air or clean flue gas is cut off, and the desulfurization tower (1) is cooled with unheated air or clean flue gas to complete the regeneration of the desulfurization tower (1). Step S4: The sulfur dioxide and impurities obtained from desorption in step S3 are introduced together with the desorbed gas into the subsequent sulfur treatment section for desulfurization treatment.

14. The flue gas emission purification method as described in claim 13, characterized in that, In step S1, one desulfurization tower (1) is used as a backup, and the remaining desulfurization towers (1) are used to adsorb the flue gas from coal loading and coking.

15. The flue gas emission purification method as described in claim 13, characterized in that, In step S2, after the desulfurization tower (1) has reached a preset adsorption level, the regeneration gas is pressurized by the regeneration fan (5) to a pressure difference of 0.1 kPa to 30 kPa, and the pressure difference between the inlet and outlet of the desulfurization tower (1) is less than 4 kPa; the regeneration gas is heated to 160°C to 350°C by the heater (4) and then the desulfurization tower (1) is regenerated.

16. The flue gas emission purification method as described in claim 13, characterized in that, In step S4, the concentration of sulfur dioxide in the desorbed gas is less than or equal to 20 g / m³. 3 The subsequent sulfur treatment section performs acid production or alkali spraying on the sulfur dioxide in the desorbed gas.

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