CN205208595U - Coal -fired many pollutants of flue gas concurrent processing system - Google Patents

Abstract

The utility model discloses a coal -fired many pollutants of flue gas concurrent processing system, the demercuration processing is carried out through low NOx burner combustion processing after take off mercury adsorption agent injection system in the absorption tower that includes low NOx burner, takes off mercury adsorption agent injection system, sulfur trioxide desorption system and SOx/NOx control dust pelletizing system and feed through with SOx/NOx control dust pelletizing system exhaust pass, fuel, then SOx/NOx control dust pelletizing system handle after gets into absorption tower through getting into behind the sulfur trioxide desorption sulfur trioxide of system, carrying out organic reasonable combination, the design of synthesizing the integration, highly integrated's processing to each unit technology of desulfurization, denitration, dust removal and demercuration and device, realizing the super clean emission of multiple pollutant, the at utmost reduces the effluent concentration of the multiple pollutant of flue gas, has reduced investment and area by a wide margin, has also effectively reduced the flue gas flow resistance of equipment, has saved a large amount of working costss.

Description

Coal-fired flue-gas multi-pollutant coprocessing system

Technical field

The utility model relates to a kind of fume treatment field, particularly a kind of coal-fired flue-gas multi-pollutant coprocessing system.

Background technology

Acid rain problem and greenhouse effects are global environmental problems of face of mankind nowadays.The sulfur dioxide SO2 that fire coal produces and nitrogen oxide NOX pollution are the major primary things of acid rain, and the carbon dioxide CO2 produced is then main greenhouse gases, and wherein the discharge capacity of CO2 accounts for 30% of the CO2 total release that mankind's activity causes.The energy resource structure of China is based on coal, and polluting coal-fired flue-gas and control to be realize requirement that is economic, social, harmonious development, is also the requirement playing coal in China superiority of reserves, realize self sustainable development of society.At present, to the control technology that coal-fired flue-gas pollutes, as the great majority such as desulphurization and denitration, dedusting and decarburization or exploitation separately, form independently technical equipment and technological process separately.Domestic and international coal-burning power plant is in order to reach the requirement of environment protection emission, and SO2, NOX in removing smoke and dust, at least need employing two to overlap above independently desulphurization and denitration and cleaner.In the face of the aggravation of global greenhouse effects, domestic and international coal-burning power plant also has to the decarburization technique of studying coal-fired flue gas, and some large enterprises are even building independently power plant's decarburization engineering.In order to solve the problem existing for coal-fired flue-gas pollutant dispersion removing sulfuldioxide, publication number is that the Chinese utility model patent description of CN2712446Y and CN274697IY proposes one " flue gas desulfurization and denitrification device " and a kind of " Desulfurization and Denitration Integrated Flue Gas Purification Tower " respectively, but its desulphurization denitration equipment is the filler device of volume bulkiness, and directly employing ammonia spirit absorbs the NOX in flue gas, not only the resistance of whole desulphurization denitration equipment significantly increases, nor the NOX that can effectively remove in flue gas, because more than 90% is nitric oxide NO in NOX component, and NO is difficult to be dissolved in the water, simple washing method is adopted to be difficult to NO to absorb.Publication number is that the Chinese invention patent application prospectus of CN1559654A describes one " desulfurization, dedusting, denitrogenation, defluorinate wet-type smoke purification machine group and purification method thereof ", it utilizes alkali lye to mix the multiple pollutant removed in flue gas with flue gas, but this unit and purification method can produce a large amount of waste water, not only need to carry out reprocessing to waste water, and this technical scheme is too low to the removal efficiency of NOX, simultaneously also high to the requirement for anticorrosion of equipment, cause complex process, operating cost increases.Existing Single Pollution thing control system is simple combination just, cost is high, serious waste of resources, be difficult to realize the ultra-clean discharge of multiple pollutant, especially to sulfur trioxide, its existence can cause SCR to move back fortune when underload, discharged nitrous oxides is caused to exceed standard, even heavy corrosion post equipment.Therefore, need badly and develop cost rationally, reliable, the coal-fired flue-gas ultra-clean draining technology system of low energy consumption.

Utility model content

In view of this, the purpose of this utility model is to provide a kind of coal-fired flue-gas multi-pollutant coprocessing system, realizes the ultra-clean discharge of multiple pollutant, at utmost reduces the concentration of emission of various pollutants of fume.

Coal-fired flue-gas multi-pollutant coprocessing system of the present utility model, comprise low NO, demercuration adsorbent spraying system, sulfur trioxide remove system and desulfur denitrate dust collecting system and the absorption tower that is communicated with desulfur denitrate dust collecting system outlet flue, fuel through low NO burning process after carry out demercuration process through demercuration adsorbent spraying system, then through sulfur trioxide remove enter the process of desulfur denitrate dust collecting system after system removes sulfur trioxide after enter absorption tower;

Further, described desulfur denitrate dust collecting system comprises SCR denitration device, low low temp. electric deduster, boiling type foam desulfurization and dedusting absorption tower and wet electrical dust precipitator, the flue gas removing system process through sulfur trioxide enters boiling type foam desulfurization and dedusting absorption tower and carries out two-stage dust removal and desulfurization process after low low temp. electric deduster carries out primary dust removing, then carries out 3-stage dust-removal through wet electrical dust precipitator and removes the sulfuric acid droplet in flue gas;

Further, the inlet flue duct of described low low temp. electric deduster is provided with residual neat recovering system;

Further, described residual neat recovering system is Teflon plastic heat exchanger;

Further, boiling type foam mass transfer elements, wall ring, slurries spraying layer and honeycomb fashion centrifugal demister is provided with in described boiling type foam desulfurization and dedusting absorption tower;

Further, described boiling type foam mass transfer elements arranges two-layer, and ground floor foam member is from flue entrance top mark rise from being not less than 1m, and second layer foam member is not less than 1.5m from ground floor spraying layer distance, and between two layers of foam component, spacing is not less than 2m;

Further, described wall ring arranges 1 ~ 3 layer, and wall ring width is not less than 200mm, and described slurries spraying layer is intersect 3 ~ 5 layers that are dislocatedly distributed;

Further, described honeycomb fashion centrifugal demister arranges 1 ~ 2 layer, and the centrifugal drift angle of demister blade is 30 °, and every layer of demister arranges flushing water up and down respectively, and demister outlet droplet concentration is less than 20mg/Nm ³, total pressure drag is less than 350Pa;

Further, described wet electrical dust precipitator is tubular type or board-like, and the gas approach passage of described wet electrical dust precipitator and exit passageway arrange airflow uniform distribution device;

Further, the power acquisition constant flow high pressure power supply of described wet electrical dust precipitator, cathode line adopts needle-penetrating, and flushing water system adopts indirect backwashing manner, washing time interval 24h.

The beneficial effects of the utility model: coal-fired flue-gas multi-pollutant coprocessing system of the present utility model, to traditional coal-burning boiler tail flue gas desulfurization, denitration, dedusting and each cell process of demercuration and device carry out organic rational combination, comprehensive integrated design, the process of Highgrade integration, realize the ultra-clean discharge of multiple pollutant, at utmost reduce the concentration of emission of various pollutants of fume, eliminate the huge flue connected system needed for each cell process and device independent operating, and corresponding fume collection and diffusion profile facility, significantly decrease investment and floor space, also the smoke flow resistance of equipment is effectively reduced, save a large amount of operating cost.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, the utility model is further described:

Fig. 1 is structural representation of the present utility model.

Detailed description of the invention

Fig. 1 is structural representation of the present utility model, as shown in the figure: the coal-fired flue-gas multi-pollutant coprocessing system of the present embodiment, comprise low NO 1, demercuration adsorbent spraying system 2, sulfur trioxide remove system 3 and desulfur denitrate dust collecting system and the absorption tower 9 that is communicated with desulfur denitrate dust collecting system outlet flue, fuel through low NO 1 burn process after carry out demercuration process through demercuration adsorbent spraying system, then through sulfur trioxide remove enter the process of desulfur denitrate dust collecting system after system 2 removes sulfur trioxide after enter absorption tower 9; Low NO 1 reduces NO _xgeneration, demercuration adsorbent spraying system 2 is for carrying out first demercuration to fuel flue gas, and desulfur denitrate dust collecting system is used for realizing SO _2,sO _3,the associated treatment of the pollutants such as dust (comprising PM10, PM2.5 and following particulate pollutant), mercury, finally realizes the ultra-clean discharge of multiple pollutant, at utmost reduces the concentration of emission of various pollutants of fume; Sulfur trioxide removes system 3 and removes sulfur trioxide solution NH ₃with SO ₃react generation ammonium hydrogen sulfate, ammonium hydrogen sulfate is deposited on catalyst surface, blocking catalyst hole, except activity and the life-span of low catalyst, causes denitrating system need stop when underload spraying the problem that in the out of service and subsequent technique of ammonia, low temperature catalyst also cannot use; The blockage problem that the viscosity simultaneously solving ammonium hydrogen sulfate causes a large amount of flying dust to be deposited on equipment surface to cause, and and then the safe operation problem that causes equipment short circuit to cause.

In the present embodiment, described desulfur denitrate dust collecting system comprises SCR denitration device 4, low low temp. electric deduster 6, boiling type foam desulfurization and dedusting absorption tower 7 and wet electrical dust precipitator 8, described absorption tower 9 is communicated with the exhaust pass of wet electrical dust precipitator 8 and arranges, the flue gas removing system process through sulfur trioxide enters boiling type foam desulfurization and dedusting absorption tower 7 and carries out two-stage dust removal and desulfurization process after low low temp. electric deduster 6 carries out primary dust removing, then carries out 3-stage dust-removal through wet electrical dust precipitator 8 and absorption tower 9 and removes the sulfuric acid droplet in flue gas; Avoid NH ₃with SO ₃react generation ammonium hydrogen sulfate, ammonium hydrogen sulfate is deposited on catalyst surface, ensure activity and the life-span of catalyst, guarantee the normal operation of SCR, low low temp. electric deduster 6, boiling type foam desulfurization and dedusting absorption tower 7 and wet electrical dust precipitator 8 and air preheater, avoid causing simultaneously wet electrical dust precipitator 8 break down problem (as electric cleaner stick with paste plate, electric-bag complex dust collector sticks with paste the problems such as bag).Each equipment there will not be the problem such as burn into blocking, " Lan Yu ", ensures the safe operation of each equipment of unit and avoids problem of environmental pollution.The entrance flue gas temperature of low low temp. electric dedusting is 85 ~ 95 DEG C, and flue gas ratio resistance is 10 ¹⁰~ 10 ¹¹Ω cm.

In the present embodiment, the inlet flue duct of described low low temp. electric deduster is provided with residual neat recovering system 5; Guarantee the normal operation of low low temp. electric deduster.

In the present embodiment, described residual neat recovering system 5 is Teflon plastic heat exchanger; Corrosion resistance is strong, and exchange capability of heat is large, degree of depth Mist heat recovering data, reduces flue-gas temperature, makes SO3 aggegation on flue dust surface, removes, improve the removal efficiency to SO3 after entering electric precipitation.

In the present embodiment, in described boiling type foam desulfurization and dedusting absorption tower 7, be provided with boiling type foam mass transfer elements, wall ring, slurries spraying layer and honeycomb fashion centrifugal demister; Foam mass transfer elements, wall ring, slurries spraying layer and honeycomb fashion centrifugal demister are existing structure, repeat no longer one by one herein.

In the present embodiment, described boiling type foam mass transfer elements arranges two-layer, and ground floor foam member is from flue entrance top mark rise from being not less than 1m, and second layer foam member is not less than 1.5m from ground floor spraying layer distance, and between two layers of foam component, spacing is not less than 2m; Lower floor's foam member percent opening is greater than upper foam component.

In the present embodiment, described wall ring arranges 1 ~ 3 layer, and wall ring width is not less than 200mm, and described slurries spraying layer is intersect 3 ~ 5 layers that are dislocatedly distributed; Described honeycomb fashion centrifugal demister arranges 1 ~ 2 layer, and the centrifugal drift angle of demister blade is 30 °, and every layer of demister arranges flushing water up and down respectively, and demister outlet droplet concentration is less than 20mg/Nm ³, total pressure drag is less than 350Pa; By improving fume treatment effect to the position distribution of foam mass transfer elements, wall ring, slurries spraying layer and honeycomb fashion centrifugal demister, improve desulfurization dust-removing efficiency.

In the present embodiment, described wet electrical dust precipitator 8 is tubular type or board-like, and the gas approach passage of described wet electrical dust precipitator and exit passageway arrange airflow uniform distribution device;

In the present embodiment, the power acquisition constant flow high pressure power supply of described wet electrical dust precipitator 8, cathode line adopts needle-penetrating, and flushing water system adopts indirect backwashing manner, washing time interval 24h.

What finally illustrate is, above embodiment is only in order to illustrate the technical solution of the utility model and unrestricted, although be described in detail the utility model with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify to the technical solution of the utility model or equivalent replacement, and not departing from aim and the scope of technical solutions of the utility model, it all should be encompassed in the middle of right of the present utility model.

Claims (10)

1. a coal-fired flue-gas multi-pollutant coprocessing system, it is characterized in that: comprise low NO, demercuration adsorbent spraying system, sulfur trioxide remove system and desulfur denitrate dust collecting system and the absorption tower that is communicated with desulfur denitrate dust collecting system outlet flue, fuel through low NO burning process after carry out demercuration process through demercuration adsorbent spraying system, then through sulfur trioxide remove enter the process of desulfur denitrate dust collecting system after system removes sulfur trioxide after enter absorption tower.

2. coal-fired flue-gas multi-pollutant coprocessing system according to claim 1, it is characterized in that: described desulfur denitrate dust collecting system comprises SCR denitration device, low low temp. electric deduster, boiling type foam desulfurization and dedusting absorption tower and wet electrical dust precipitator, described absorption tower is communicated with the exhaust pass of wet electrical dust precipitator and arranges, the flue gas removing system process through sulfur trioxide enters boiling type foam desulfurization and dedusting absorption tower and carries out two-stage dust removal and desulfurization process after low low temp. electric deduster carries out primary dust removing, then carry out 3-stage dust-removal through wet electrical dust precipitator and remove the sulfuric acid droplet in flue gas.

3. coal-fired flue-gas multi-pollutant coprocessing system according to claim 2, is characterized in that: the inlet flue duct of described low low temp. electric deduster is provided with residual neat recovering system.

4. coal-fired flue-gas multi-pollutant coprocessing system according to claim 3, is characterized in that: described residual neat recovering system is Teflon plastic heat exchanger.

5. coal-fired flue-gas multi-pollutant coprocessing system according to claim 2, is characterized in that: be provided with boiling type foam mass transfer elements, wall ring, slurries spraying layer and honeycomb fashion centrifugal demister in described boiling type foam desulfurization and dedusting absorption tower.

6. coal-fired flue-gas multi-pollutant coprocessing system according to claim 5, it is characterized in that: described boiling type foam mass transfer elements arranges two-layer, ground floor foam member is from flue entrance top mark rise from being not less than 1m, second layer foam member is not less than 1.5m from ground floor spraying layer distance, and between two layers of foam component, spacing is not less than 2m.

7. coal-fired flue-gas multi-pollutant coprocessing system according to claim 5, is characterized in that: described wall ring arranges 1 ~ 3 layer, and wall ring width is not less than 200mm, and described slurries spraying layer is intersect 3 ~ 5 layers that are dislocatedly distributed.

8. coal-fired flue-gas multi-pollutant coprocessing system according to claim 5, it is characterized in that: described honeycomb fashion centrifugal demister arranges 1 ~ 2 layer, the centrifugal drift angle of demister blade is 30 °, and every layer of demister arranges flushing water up and down respectively, and demister outlet droplet concentration is less than 20mg/Nm ³, total pressure drag is less than 350Pa.

9. coal-fired flue-gas multi-pollutant coprocessing system according to claim 2, is characterized in that: described wet electrical dust precipitator is tubular type or board-like, and the gas approach passage of described wet electrical dust precipitator and exit passageway arrange airflow uniform distribution device.

10. coal-fired flue-gas multi-pollutant coprocessing system according to claim 9, it is characterized in that: the power acquisition constant flow high pressure power supply of described wet electrical dust precipitator, cathode line adopts needle-penetrating, and flushing water system adopts indirect backwashing manner, washing time interval 24h.