CN204656311U - A kind of cleaning system of coal-fired plant flue gas - Google Patents
A kind of cleaning system of coal-fired plant flue gas Download PDFInfo
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- CN204656311U CN204656311U CN201520328295.5U CN201520328295U CN204656311U CN 204656311 U CN204656311 U CN 204656311U CN 201520328295 U CN201520328295 U CN 201520328295U CN 204656311 U CN204656311 U CN 204656311U
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Abstract
The utility model relates to a kind of cleaning system of coal-fired plant flue gas, by setting gradually Benitration reactor, deduster, desulfuration absorbing tower and pressure-swing absorption apparatus along process route, thus described in the desulphurization denitration flue gas utilization of being discharged by desulfuration absorbing tower, pressure-swing absorption apparatus carries out SO
2, NO
x, dust, the absorption of mercury retains, realize the deep purifying to flue gas, also comprise by arranging described pressure-swing absorption apparatus the first psa unit and the second psa unit that are arranged in parallel, and utilize packed tower in described first psa unit or the second psa unit to carry out also carrying out pulse cleaning to packed tower after absorption retains to flue gas, effectively can also guarantee while realizing that deep purifying is carried out to flue gas that whole system can the operation of continuous and effective for a long time, the cleaning system of coal-fired plant flue gas described in the utility model, by the deep purifying to boiler of power plant flue gas, significantly can reduce the middle SO of flue gas
2, NO
x, dust and content of beary metal.
Description
Technical field
The utility model relates to a kind of cleaning system of coal-fired plant flue gas, belongs to the technical field of coal-fired plant flue gas purification.
Background technology
Containing sulfur dioxide (SO in the flue gas of coal-burning power plant
2), nitrogen oxide (NO
x, mainly NO), dust (PM) and heavy metal (such as mercury) etc. are to the harmful material of human health and GHG carbon dioxide (CO
2), reaching national requirements limit value after needing to carry out absorption cleaning could to airborne release.
At present, coal-burning power plant generally adopts the chemical absorption method in wet desulphurization, as limestone-gypsum method, removes the SO in flue gas
2; Adopt chemical reduction method, as ammonia process SCR (NH
3-SCR), by NO
xbe converted into harmless nitrogen, be separated the dust in removing flue gas by electric precipitation or bag-ty pe dust collection, above each flow process is together in series and defines the flue gas purifying technique of coal-burning power plant's main flow.
But, because power-plant flue gas flow is large, by the restriction of chemical reaction equilibrium, wet desulphurization and NH
3-SCR denitration is general respectively 96% and 85% for pollutant removing efficiency, for the power-plant flue gas of burning high sulfur coal and colm, and SO
2, NO
xgenerally too high with dust content, after adopting above-mentioned technique to carry out gas cleaning, be still difficult to the discharge standard reaching national requirements.On the other hand, even if above-mentioned flue gas can reach the standard limit of smog release of coal-burning power plant after purified treatment, because the pollutant removing efficiency of above-mentioned technique also reaches capacity substantially, following more harsh discharging standards cannot be adapted to, such as, reach the standard limit of smog release of plant gas.In addition, existing power-plant flue gas process for purifying does not still possess the function regulating heavy metals emission limit value and control CO2 emissions.
Utility model content
Technical problem to be solved in the utility model be coal-fired plant flue gas of the prior art after purified treatment, be still difficult to reach national standard limit of smog release, thus a kind of middle SO that significantly can reduce flue gas be provided
2, NO
xwith the cleaning system of the coal-fired plant flue gas of dust content.
For solving the problems of the technologies described above, the utility model is achieved through the following technical solutions:
A cleaning system for coal-fired plant flue gas, is communicated with successively along process route and is provided with Benitration reactor, deduster, desulfuration absorbing tower and pressure-swing absorption apparatus;
Described pressure-swing absorption apparatus comprises the first psa unit and the second psa unit that are arranged in parallel;
Described first psa unit comprises the packed tower of a packed tower or multiple parallel connection, the bottom of each described packed tower is communicated with the smoke inlet of described Benitration reactor with the exhanst gas outlet of described desulfuration absorbing tower respectively and arranges, flue bottom described packed tower and between described desulfuration absorbing tower exhanst gas outlet is provided with the first motor-driven valve, the flue bottom described packed tower and between described Benitration reactor smoke inlet is provided with the second motor-driven valve;
All be connected with the top of each described packed tower and arrange purified gas discharge line and purified gas blowback passage, described purified gas discharge line is provided with the 3rd motor-driven valve, and described purified gas blowback passage is provided with the 4th motor-driven valve;
Described second psa unit comprises the packed tower of a packed tower or multiple parallel connection, the bottom of each described packed tower is communicated with the smoke inlet of described Benitration reactor with the exhanst gas outlet of described desulfuration absorbing tower respectively and arranges, flue bottom described packed tower and between described desulfuration absorbing tower exhanst gas outlet is provided with the 5th motor-driven valve, the flue bottom described packed tower and between described Benitration reactor smoke inlet is provided with the 6th motor-driven valve;
All be connected with the top of each described packed tower and arrange purified gas discharge line and purified gas blowback passage, described purified gas discharge line is provided with the 7th motor-driven valve, and described purified gas blowback passage is provided with the 8th motor-driven valve;
When described first motor-driven valve and the 3rd motor-driven valve are opened, and when described second motor-driven valve and described 4th motor-driven valve close, described first psa unit carries out absorption to flue gas and retains; When described first motor-driven valve and the 3rd motor-driven valve close, and when described second motor-driven valve and described 4th motor-driven valve are opened, described first psa unit carries out pulse cleaning;
When described 5th motor-driven valve and the 7th motor-driven valve are opened, and when described 6th motor-driven valve and described 8th motor-driven valve close, described second psa unit carries out absorption to flue gas and retains; When described 5th motor-driven valve and the 7th motor-driven valve close, and when described 6th motor-driven valve and described 8th motor-driven valve are opened, described second psa unit carries out pulse cleaning.
Described first psa unit and the second psa unit are that alternative expression carries out absorption to flue gas and retains.
Also CO is provided with in the downstream of described pressure-swing absorption apparatus
2pressure-swing absorption apparatus, described CO
2pressure-swing absorption apparatus comprises the packed tower of a packed tower or multiple parallel connection, is all connected arranges de-CO with the top of each described packed tower
2smoke discharge tube road and CO
2enriched gas blowback passage, described de-CO
2smoke discharge tube road is provided with the 9th motor-driven valve, described CO
2enriched gas blowback passage is provided with the tenth motor-driven valve;
When described 9th motor-driven valve and described tenth motor-driven valve closes time, described CO
2pressure-swing absorption apparatus carries out CO to flue gas
2absorption retains; When described 9th motor-driven valve is closed and described tenth motor-driven valve is opened, described CO
2pressure-swing absorption apparatus carries out pulse cleaning.
Described CO
2pressure-swing absorption apparatus comprises the 3rd psa unit and the 4th psa unit that are arranged in parallel, 3rd psa unit and the 4th psa unit comprise the packed tower of a packed tower or multiple parallel connection respectively, and described 3rd psa unit and the 4th psa unit are that alternative expression is to CO in flue gas
2carry out absorption to retain.
The top of described Benitration reactor is provided with flue gas inlet port, and bottom is provided with denitration flue gas discharge opening, and layer deposited by inside catalyst be provided with for placing denitrating catalyst between described flue gas inlet port and described denitration flue gas discharge opening.
Described deduster is communicated with described denitration flue gas discharge opening and arranges, and described deduster is electrostatic precipitator or sack cleaner.
Described desulfuration absorbing tower inside is provided with spray equipment, the tower wall be positioned at above described spray equipment is provided with desulfurization fume outlet, the bottom of described desulfuration absorbing tower is provided with lime stone slurry oxidation pond, tower wall between described spray equipment and described lime stone slurry oxidation pond is provided with sulphur removal smoke inlet, and described sulphur removal smoke inlet is communicated with the dedusting exhanst gas outlet of described deduster and arranges.
Described spray equipment is provided with multiple shower nozzle, and described multiple shower nozzle is that layering is arranged.
Catalyst in described Benitration reactor is deposited layer and is established and have three layers.
The adsorbent of filling in described packed tower comprises the mixture of one or more in zeolite molecular sieve, 5A molecular sieve, 4A molecular sieve, 3A molecular sieve, active carbon, carbon molecular sieve, aluminium oxide, 13X molecular sieve, silica gel, ZSM-5.
Technique scheme of the present utility model has the following advantages compared to existing technology:
(1) cleaning system of coal-fired plant flue gas described in the utility model, by setting gradually Benitration reactor, deduster, desulfuration absorbing tower and pressure-swing absorption apparatus along process route, thus described pressure-swing absorption apparatus is utilized to carry out SO further the desulphurization denitration flue gas that desulfuration absorbing tower is discharged
2, NO
x, dust, the absorption of mercury retains, realize the deep purifying to flue gas, also comprise by arranging described pressure-swing absorption apparatus the first psa unit and the second psa unit that are arranged in parallel afterwards, and utilize packed tower in described first psa unit or the second psa unit to carry out also carrying out pulse cleaning to packed tower after absorption retains to flue gas, thus while realizing that deep purifying is carried out to flue gas, effectively can also guarantee that whole system can the operation of continuous and effective for a long time, the cleaning system of coal-fired plant flue gas described in the utility model, by the deep purifying to boiler of power plant flue gas, significantly can reduce the middle SO of flue gas
2, NO
x, dust and content of beary metal, SO
2, NO
x, dust rejection up to 90-99%, the rejection of mercury also more than 90%, SO in gas after cleaning system process described in the utility model
2, NO
x, dust and mercury content be only 10-50,20-100,4-30,0.001-0.03mg/Nm respectively
3, can directly discharge, the operating cost of described cleaning system is low, can realize automatic management.
(2) cleaning system of coal-fired plant flue gas described in the utility model, be that alternative expression carries out absorption to flue gas and retains by arranging described first psa unit and the second psa unit, namely when described first psa unit to flue gas carry out absorption retain time, described second psa unit carries out self pulse cleaning, when described second psa unit to flue gas carry out absorption retain time, described first psa unit carries out self pulse cleaning, thus ensure that described cleaning system can continuously and carry out deep purifying to flue gas efficiently, remain higher purification efficiency.
(3) cleaning system of coal-fired plant flue gas described in the utility model, by being also provided with CO in the downstream of described pressure-swing absorption apparatus
2pressure-swing absorption apparatus, and with described CO
2the top of the packed tower of pressure-swing absorption apparatus all connects and arranges de-CO
2smoke discharge tube road and CO
2enriched gas blowback passage, thus the desulphurization denitration flue gas that can realize the first psa unit or the second psa unit are discharged utilizes described CO further
2pressure-swing absorption apparatus carries out CO
2absorption retain, obtain de-CO
2purified gas, afterwards by described de-CO
2purified gas utilizes CO
2enriched gas blowback passage introduces described CO
2pressure-swing absorption apparatus carries out pulse cleaning, is conducive to obtaining CO
2the CO that content is greater than 80%
2enriched gas, described CO
2enriched gas can realize recycling, thus the cleaning system of coal-fired plant flue gas described in the utility model, realizing CO
2cO is realized while reducing discharging
2the recycling of enriched gas.
Accompanying drawing explanation
In order to make content of the present utility model be more likely to be clearly understood, below in conjunction with accompanying drawing, the utility model is described in further detail, wherein,
Fig. 1 is the structural representation of the cleaning system of coal-fired plant flue gas described in the utility model.
In figure, Reference numeral is expressed as: 1-coal dust charging aperture, 2-coal-burning boiler, 3-second motor-driven valve, 4-first motor-driven valve, 5-first stop valve, 6-first packed tower, 7-first overhead electric valve, 8-the 3rd motor-driven valve, 9-the 4th motor-driven valve, 10-first psa unit, 11-first ball valve, 12-second psa unit, 13-second ball valve, 14-second overhead electric valve, 15-the 8th motor-driven valve, 16-the 7th motor-driven valve, 17-purified gas draws blower fan, 18-chimney, 19-first air intlet, 20-purified gas introduces blower fan, 21-second packed tower, 22-the 6th motor-driven valve, 23-second stop valve, 24-the 5th motor-driven valve, 25-desulfuration absorbing tower, 26-flue gas introduces blower fan, 27-deduster, 29-hot-air introduces blower fan, 28-second air intlet, 30-air preheater, 31-Benitration reactor.
Detailed description of the invention
The structure of the cleaning system of coal-fired plant flue gas described in the utility model as shown in Figure 1, it is communicated with successively along process route and is provided with Benitration reactor 31, deduster 27, desulfuration absorbing tower 25 and pressure-swing absorption apparatus, and described pressure-swing absorption apparatus comprises the first psa unit 10 and the second psa unit 12 be arranged in parallel.
Described first psa unit 10 comprises first packed tower 6 groups of first packed tower 6 or multiple parallel connection, in the present embodiment, the adsorbent of filling in described packed tower comprises the mixture of one or more in zeolite molecular sieve, 5A molecular sieve, 4A molecular sieve, 3A molecular sieve, active carbon, carbon molecular sieve, aluminium oxide, 13X molecular sieve, silica gel, ZSM-5.
The bottom of each described first packed tower 6 is communicated with the smoke inlet of described Benitration reactor 31 with the exhanst gas outlet of described desulfuration absorbing tower 25 respectively and arranges, flue bottom described first packed tower 6 and between described desulfuration absorbing tower 25 exhanst gas outlet is provided with the first motor-driven valve 4, the flue bottom described first packed tower 6 and between described Benitration reactor 31 smoke inlet is provided with the second motor-driven valve 3; All be connected with the top of each described first packed tower 6 and purified gas discharge line and purified gas blowback passage are set, in the present embodiment, described purified gas discharge line is provided with the 3rd motor-driven valve 8, first ball valve 11 and purified gas draws blower fan 17, is connected arranges chimney 18 with described purified gas discharge line; Described purified gas blowback passage is provided with purified gas and introduces blower fan 20 and the 4th motor-driven valve 9.
Described second psa unit 12 comprises second packed tower 21 groups of second packed tower 21 or multiple parallel connection, in the present embodiment, the adsorbent of filling in described second packed tower 21 comprises the mixture of one or more in zeolite molecular sieve, 5A molecular sieve, 4A molecular sieve, 3A molecular sieve, active carbon, carbon molecular sieve, aluminium oxide, 13X molecular sieve, silica gel, ZSM-5.
The bottom of each described second packed tower 21 is communicated with the smoke inlet of described Benitration reactor 31 with the exhanst gas outlet of described desulfuration absorbing tower 25 respectively and arranges, flue bottom described second packed tower 21 and between described desulfuration absorbing tower 25 exhanst gas outlet is provided with the 5th motor-driven valve 24, the flue bottom described second packed tower 21 and between described Benitration reactor 31 smoke inlet is provided with the 6th motor-driven valve 22; All be connected with the top of each described second packed tower 21 and purified gas discharge line and purified gas blowback passage are set, in the present embodiment, described purified gas discharge line is provided with the 7th motor-driven valve 16, second ball valve 13 and described purified gas draws blower fan 17, and described purified gas blowback passage is provided with described purified gas and introduces blower fan 20 and the 8th motor-driven valve 15.
When described first motor-driven valve 4 and the 3rd motor-driven valve 8 are opened, and when described second motor-driven valve 3 closes with described 4th motor-driven valve 9, described first psa unit 10 pairs of flue gases carry out absorption and retain; When described first motor-driven valve 4 and the 3rd motor-driven valve 8 close, and when described second motor-driven valve 3 is opened with described 4th motor-driven valve 9, described first psa unit 10 carries out pulse cleaning.When described 5th motor-driven valve 24 and the 7th motor-driven valve 16 are opened, and when described 6th motor-driven valve 22 closes with described 8th motor-driven valve 15, described second psa unit 12 pairs of flue gases carry out absorption and retain; When described 5th motor-driven valve 24 and the 7th motor-driven valve 16 close, and when described 6th motor-driven valve 22 is opened with described 8th motor-driven valve 15, described second psa unit 12 carries out pulse cleaning.
In the present embodiment, the top of described Benitration reactor 31 is provided with flue gas inlet port, bottom is provided with denitration flue gas discharge opening, layer deposited by inside catalyst be provided with for placing denitrating catalyst between described flue gas inlet port and described denitration flue gas discharge opening, described catalyst take vanadium as active component, preferably, the catalyst in described Benitration reactor 31 is deposited layer and is established and have three layers.
Described deduster 27 is communicated with described denitration flue gas discharge opening and arranges, and described deduster 27 is electrostatic precipitator or sack cleaner.As preferred embodiment, in the present embodiment, between described deduster 27 and described Benitration reactor 31, be also provided with air preheater 30, described air preheater 30 is provided with the first air intlet 19 and hot-air outlet, and described hot-air outlet is communicated with described coal-burning boiler 2 and arranges.In described air preheater 30, utilize the waste heat in flue gas to carry out preheating to the air that described first air intlet 19 passes into, obtain hot-air after preheating and introduce blower fan 29 through hot-air and pass in coal-burning boiler 2 and carry out combustion reaction with coal dust.
Described desulfuration absorbing tower 25 is communicated with the exhanst gas outlet of described deduster 27 and arranges, and the flue between described desulfuration absorbing tower 25 and described deduster 27 is provided with flue gas introduces blower fan 26, described desulfuration absorbing tower 25 inside is provided with spray equipment, the tower wall be positioned at above described spray equipment is provided with desulfurization fume outlet, the bottom of described desulfuration absorbing tower 25 is provided with lime stone slurry oxidation pond, to be conducive to strengthening SO
2oxidation effectiveness, improves desulfuration efficiency; Tower wall between described spray equipment and described lime stone slurry oxidation pond is provided with sulphur removal smoke inlet, and described sulphur removal smoke inlet is communicated with the dedusting exhanst gas outlet of described deduster 27 and arranges.As the embodiment that can select, spray equipment described in the present embodiment is provided with multiple shower nozzle, and described shower nozzle divides two-layer setting; Utilize described spray equipment to spray spray liquid and carry out desulfurization to flue gas, described spray liquid is CaCO
3, CaO, Ca (OH)
2with the mixed slurry of water, introduce from outside, absorption tower.
As preferred embodiment, in the present embodiment, described first psa unit 10 and the second psa unit 12 carry out absorption in alternative expression to flue gas and retain.Namely when described first psa unit 10 pairs of flue gases carry out absorption retain time, described second psa unit 12 carries out self pulse cleaning, when described second psa unit 12 pairs of flue gases carry out absorption retain time, described first psa unit 10 carries out self pulse cleaning, thus ensure that described cleaning system continuously and carry out deep purifying to flue gas efficiently, can remain higher purification efficiency.
Further, as preferred embodiment, the present embodiment is also provided with CO in the downstream of described pressure-swing absorption apparatus
2pressure-swing absorption apparatus, described CO
2pressure-swing absorption apparatus comprises the packed tower of a packed tower or multiple parallel connection, in the present embodiment, the adsorbent of filling in described packed tower comprises the mixture of one or more in zeolite molecular sieve, 5A molecular sieve, 4A molecular sieve, 3A molecular sieve, active carbon, carbon molecular sieve, aluminium oxide, 13X molecular sieve, silica gel, ZSM-5.
All be connected with the top of each described packed tower and de-CO is set
2smoke discharge tube road and CO
2enriched gas blowback passage, described de-CO
2smoke discharge tube road is provided with the 9th motor-driven valve, described CO
2enriched gas blowback passage is provided with the tenth motor-driven valve; When described 9th motor-driven valve and described tenth motor-driven valve closes time, described CO
2pressure-swing absorption apparatus carries out CO to flue gas
2absorption retains; When described 9th motor-driven valve is closed and described tenth motor-driven valve is opened, described CO
2pressure-swing absorption apparatus carries out pulse cleaning.Therefore, by arranging described CO
2pressure-swing absorption apparatus, the desulphurization denitration flue gas that can realize the first psa unit 10 or the second psa unit 12 are discharged utilizes described CO further
2pressure-swing absorption apparatus carries out CO
2absorption retain, obtain de-CO
2purified gas, afterwards by described de-CO
2purified gas utilizes CO
2enriched gas blowback passage introduces described CO
2pressure-swing absorption apparatus carries out pulse cleaning, is conducive to obtaining CO
2the CO that content is greater than 80%
2enriched gas, described CO
2enriched gas can realize recycling, thus the cleaning system of coal-fired plant flue gas described in the utility model, realizing CO
2cO is realized while reducing discharging
2the recycling of enriched gas.
As preferred embodiment, described CO
2pressure-swing absorption apparatus comprises the 3rd psa unit and the 4th psa unit that are arranged in parallel, 3rd psa unit and the 4th psa unit comprise the packed tower of a packed tower or multiple parallel connection respectively, and described 3rd psa unit and the 4th psa unit are that alternative expression is to CO in flue gas
2carry out absorption to retain.Namely when described 3rd psa unit is to flue gas CO
2carry out absorption when retaining, described 4th psa unit carries out self pulse cleaning, when described 4th psa unit to flue gas carry out absorption retain time, described 3rd psa unit carries out the pulse cleaning of self, thus further ensure that described cleaning system can continuously and carry out CO to flue gas efficiently
2absorption retain.As the embodiment that can select, described 3rd psa unit is similar with the method for operation of described second psa unit 12 to described first psa unit 10 respectively with the method for operation of described 4th psa unit.
The technological process of the cleaning system of coal-fired plant flue gas described in the utility model is specific as follows:
(1) insert in coal-burning boiler 2 by coal dust by coal dust charging aperture 1, under hot air acting, burning produces flue gas, and flue gas first removes most of NO through described Benitration reactor 31
x, enter air preheater 30 more afterwards, utilize the waste heat in flue gas to carry out preheating to the air that described first air intlet 19 passes into, obtain hot-air after preheating and pass in coal-burning boiler 2 and carry out combustion reaction with coal dust; Flue gas after heat exchange enters deduster 27 and removes most flue dust, enters desulfuration absorbing tower 25 afterwards and removes most of SO
2;
(2) described pressure-swing absorption apparatus is utilized to carry out SO further the desulphurization denitration flue gas that desulfuration absorbing tower 25 is discharged
2, NO
x, dust, mercury absorption retain, flue gas enters described first psa unit 10 and carries out absorption when retaining, described first motor-driven valve 4, the 3rd motor-driven valve 8 and the first overhead electric valve 7 are all opened, and described second motor-driven valve 3, described 4th motor-driven valve 9, first stop valve 5 are all closed, flue gas is SO after described first psa unit 10
2, NO
xadsorbed further and retain, the flue gas after deep purifying is discharged through described purified gas discharge line, and described purified gas is drawn blower fan 17 and drawn, until finally discharged by chimney 18;
(3) until described first psa unit 10 adsorb saturated after, the flue gas after a part of described deep purifying is adopted to carry out pulse cleaning as blowback air to described first psa unit 10, and adopt described second psa unit 12 pairs of flue gases to carry out absorption to retain, at this moment described 5th motor-driven valve 24, the 7th motor-driven valve 16 and the second overhead electric valve 14 are all opened, and described 6th motor-driven valve 22, described 8th motor-driven valve 15, second stop valve 23 are all closed, flue gas is SO after described second psa unit 12
2, NO
xadsorbed further and retain, the flue gas after deep purifying is discharged through described purified gas discharge line, described purified gas is drawn blower fan 17 and drawn, until finally discharged by chimney 18.
When described first psa unit 10 carries out pulse cleaning, described first motor-driven valve 4, the 3rd motor-driven valve 8 and the first stop valve 5 close, described first overhead electric valve 7, described second motor-driven valve 3, described 4th motor-driven valve 9 are all opened, blowback air is introduced blower fan 20 by purified gas and sends into described first psa unit 10, adsorbent SO in packed tower
2, NO
xthere is De contamination and produce SO
2, NO
xenriched gas, described SO
2, NO
xenriched gas sends back to described Benitration reactor 31.
(4) after described first psa unit 10 completes regeneration, again carry out gas cleaning operation, the second psa unit 12 carries out pulse cleaning simultaneously, carries out and so forth.
The cleaning system of coal-fired plant flue gas described in the utility model, by setting gradually Benitration reactor, deduster, desulfuration absorbing tower and pressure-swing absorption apparatus along process route, thus described pressure-swing absorption apparatus is utilized to carry out SO further the desulphurization denitration flue gas that desulfuration absorbing tower is discharged
2, NO
x, dust, the absorption of mercury retains, realize the deep purifying to flue gas, also comprise by arranging described pressure-swing absorption apparatus the first psa unit and the second psa unit that are arranged in parallel afterwards, and utilize packed tower in described first psa unit or the second psa unit to carry out also carrying out pulse cleaning to packed tower after absorption retains to flue gas, thus while realizing that deep purifying is carried out to flue gas, effectively can also guarantee that whole system can the operation of continuous and effective for a long time, the cleaning system of coal-fired plant flue gas described in the utility model, by the deep purifying to boiler of power plant flue gas, significantly can reduce the middle SO of flue gas
2, NO
x, dust and content of beary metal, SO
2, NO
x, dust rejection up to 90-99%, the rejection of mercury also more than 90%, SO in gas after cleaning system process described in the utility model
2, NO
x, dust and mercury content be only 10-50,20-100,4-30,0.001-0.03mg/Nm respectively
3, can directly discharge, the operating cost of described cleaning system is low, can realize automatic management.
Obviously, above-described embodiment is only for clearly example being described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And thus the apparent change of extending out or variation be still among protection domain of the present utility model.
Claims (10)
1. a cleaning system for coal-fired plant flue gas, is communicated with successively along process route and is provided with Benitration reactor, deduster, desulfuration absorbing tower and pressure-swing absorption apparatus;
It is characterized in that,
Described pressure-swing absorption apparatus comprises the first psa unit and the second psa unit that are arranged in parallel;
Described first psa unit comprises the packed tower of a packed tower or multiple parallel connection, the bottom of each described packed tower is communicated with the smoke inlet of described Benitration reactor with the exhanst gas outlet of described desulfuration absorbing tower respectively and arranges, flue bottom described packed tower and between described desulfuration absorbing tower exhanst gas outlet is provided with the first motor-driven valve, the flue bottom described packed tower and between described Benitration reactor smoke inlet is provided with the second motor-driven valve;
All be connected with the top of each described packed tower and arrange purified gas discharge line and purified gas blowback passage, described purified gas discharge line is provided with the 3rd motor-driven valve, and described purified gas blowback passage is provided with the 4th motor-driven valve;
Described second psa unit comprises the packed tower of a packed tower or multiple parallel connection, the bottom of each described packed tower is communicated with the smoke inlet of described Benitration reactor with the exhanst gas outlet of described desulfuration absorbing tower respectively and arranges, flue bottom described packed tower and between described desulfuration absorbing tower exhanst gas outlet is provided with the 5th motor-driven valve, the flue bottom described packed tower and between described Benitration reactor smoke inlet is provided with the 6th motor-driven valve;
All be connected with the top of each described packed tower and arrange purified gas discharge line and purified gas blowback passage, described purified gas discharge line is provided with the 7th motor-driven valve, and described purified gas blowback passage is provided with the 8th motor-driven valve;
When described first motor-driven valve and the 3rd motor-driven valve are opened, and when described second motor-driven valve and described 4th motor-driven valve close, described first psa unit carries out absorption to flue gas and retains; When described first motor-driven valve and the 3rd motor-driven valve close, and when described second motor-driven valve and described 4th motor-driven valve are opened, described first psa unit carries out pulse cleaning;
When described 5th motor-driven valve and the 7th motor-driven valve are opened, and when described 6th motor-driven valve and described 8th motor-driven valve close, described second psa unit carries out absorption to flue gas and retains; When described 5th motor-driven valve and the 7th motor-driven valve close, and when described 6th motor-driven valve and described 8th motor-driven valve are opened, described second psa unit carries out pulse cleaning.
2. the cleaning system of coal-fired plant flue gas according to claim 1, is characterized in that, described first psa unit and the second psa unit are that alternative expression carries out absorption to flue gas and retains.
3. the cleaning system of coal-fired plant flue gas according to claim 1 and 2, is characterized in that, is also provided with CO in the downstream of described pressure-swing absorption apparatus
2pressure-swing absorption apparatus, described CO
2pressure-swing absorption apparatus comprises the packed tower of a packed tower or multiple parallel connection, is all connected arranges de-CO with the top of each described packed tower
2smoke discharge tube road and CO
2enriched gas blowback passage, described de-CO
2smoke discharge tube road is provided with the 9th motor-driven valve, described CO
2enriched gas blowback passage is provided with the tenth motor-driven valve;
When described 9th motor-driven valve and described tenth motor-driven valve closes time, described CO
2pressure-swing absorption apparatus carries out CO to flue gas
2absorption retains; When described 9th motor-driven valve is closed and described tenth motor-driven valve is opened, described CO
2pressure-swing absorption apparatus carries out pulse cleaning.
4. the cleaning system of coal-fired plant flue gas according to claim 3, is characterized in that, described CO
2pressure-swing absorption apparatus comprises the 3rd psa unit and the 4th psa unit that are arranged in parallel, 3rd psa unit and the 4th psa unit comprise the packed tower of a packed tower or multiple parallel connection respectively, and described 3rd psa unit and the 4th psa unit are that alternative expression is to CO in flue gas
2carry out absorption to retain.
5. the cleaning system of the coal-fired plant flue gas according to claim 1 or 2 or 4, it is characterized in that, the top of described Benitration reactor is provided with flue gas inlet port, bottom is provided with denitration flue gas discharge opening, and layer deposited by inside catalyst be provided with for placing denitrating catalyst between described flue gas inlet port and described denitration flue gas discharge opening.
6. the cleaning system of coal-fired plant flue gas according to claim 5, is characterized in that, described deduster is communicated with described denitration flue gas discharge opening and arranges, and described deduster is electrostatic precipitator or sack cleaner.
7. the cleaning system of the coal-fired plant flue gas according to claim 1 or 2 or 4 or 6, it is characterized in that, described desulfuration absorbing tower inside is provided with spray equipment, the tower wall be positioned at above described spray equipment is provided with desulfurization fume outlet, the bottom of described desulfuration absorbing tower is provided with lime stone slurry oxidation pond, tower wall between described spray equipment and described lime stone slurry oxidation pond is provided with sulphur removal smoke inlet, and described sulphur removal smoke inlet is communicated with the dedusting exhanst gas outlet of described deduster and arranges.
8. the cleaning system of coal-fired plant flue gas according to claim 7, is characterized in that, described spray equipment is provided with multiple shower nozzle, and described multiple shower nozzle is that layering is arranged.
9. the cleaning system of coal-fired plant flue gas according to claim 5, is characterized in that, the catalyst in described Benitration reactor is deposited layer and established and have three layers.
10. the cleaning system of the coal-fired plant flue gas according to claim 1 or 2 or 4 or 6 or 8 or 9, it is characterized in that, the adsorbent of filling in described packed tower comprises the mixture of one or more in zeolite molecular sieve, 5A molecular sieve, 4A molecular sieve, 3A molecular sieve, active carbon, carbon molecular sieve, aluminium oxide, 13X molecular sieve, silica gel, ZSM-5.
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