CN118286782A - Collaborative mercury removal and dust removal system and method for coal-fired power plant - Google Patents
Collaborative mercury removal and dust removal system and method for coal-fired power plant Download PDFInfo
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- CN118286782A CN118286782A CN202410436370.3A CN202410436370A CN118286782A CN 118286782 A CN118286782 A CN 118286782A CN 202410436370 A CN202410436370 A CN 202410436370A CN 118286782 A CN118286782 A CN 118286782A
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- 239000000428 dust Substances 0.000 title claims abstract description 185
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 title claims abstract description 121
- 229910052753 mercury Inorganic materials 0.000 title claims abstract description 110
- 238000000034 method Methods 0.000 title claims abstract description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 80
- 239000003463 adsorbent Substances 0.000 claims abstract description 53
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000003546 flue gas Substances 0.000 claims abstract description 43
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 39
- 239000004071 soot Substances 0.000 claims abstract description 24
- 239000007789 gas Substances 0.000 claims abstract description 23
- 238000007664 blowing Methods 0.000 claims abstract description 14
- 230000005540 biological transmission Effects 0.000 claims abstract description 10
- 238000009833 condensation Methods 0.000 claims abstract description 7
- 230000005494 condensation Effects 0.000 claims abstract description 7
- 230000002195 synergetic effect Effects 0.000 claims abstract description 6
- 238000004064 recycling Methods 0.000 claims abstract description 3
- 238000005192 partition Methods 0.000 claims description 9
- 238000000926 separation method Methods 0.000 claims description 9
- 230000008929 regeneration Effects 0.000 claims description 5
- 238000011069 regeneration method Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 3
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000000779 smoke Substances 0.000 claims description 2
- 239000003245 coal Substances 0.000 claims 7
- 239000002594 sorbent Substances 0.000 claims 4
- 238000007599 discharging Methods 0.000 claims 1
- 238000011084 recovery Methods 0.000 abstract description 5
- 239000002912 waste gas Substances 0.000 abstract description 3
- 239000002956 ash Substances 0.000 description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 11
- 238000000746 purification Methods 0.000 description 7
- 238000001179 sorption measurement Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 239000000835 fiber Substances 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 239000012717 electrostatic precipitator Substances 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 125000000304 alkynyl group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 231100000693 bioaccumulation Toxicity 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
Abstract
The invention discloses a collaborative mercury removal and dust removal system and method for a coal-fired power plant, and belongs to the technical field of waste gas treatment; it comprises the following steps: the device comprises a bag type dust collection assembly and a condensation recovery assembly, wherein the bag type dust collection assembly comprises a dust collection bin and a plurality of bag type dust collectors arranged in the dust collection bin, an adsorbent layer for adsorbing mercury is arranged in the bag type dust collectors, and the bag type dust collectors can separate soot and mercury in flue gas; the dust removal bin is provided with a gas transmission port for blowing high-temperature nitrogen into the dust removal bin, and the high-temperature nitrogen can blow the adsorbent layer of the bag-type dust remover to remove mercury; the condensing and recycling assembly comprises a condenser, the condenser is communicated with the dust removal bin through a pipeline, the condenser can condense high-temperature nitrogen passing through the bag-type dust remover, and mercury in gas is separated. The invention can simplify equipment and realize the intensive synergistic removal of mercury and particulate matters in the flue gas.
Description
Technical Field
The invention relates to the technical field of waste gas treatment, in particular to a collaborative mercury removal and dust removal system and method for a coal-fired power plant.
Background
Mercury (Hg) has received extensive social attention for its pollution problems due to its strong bioaccumulation and high toxicity. Coal-fired boilers are considered to be the most important artificial mercury generating source, and it is urgent to seek efficient and economical mercury pollution control technologies.
The invention creation of publication number CN104353325A discloses a device for removing mercury from the flue gas of a power station boiler, which comprises an electrostatic precipitator, wherein the electrostatic precipitator is used for removing coarse ash and most of fine ash in the flue gas, and the flue gas passes through an adsorbent injection area and then enters a bag-type dust remover after exiting the electrostatic precipitator; the adsorbent spraying system is used for spraying the adsorbent for adsorbing and removing mercury in the flue gas into the adsorbent spraying area; the cloth bag dust remover is used for carrying out gas-solid separation on the flue gas entering the cloth bag dust remover, the flue gas subjected to mercury removal enters a subsequent desulfurization process through the cloth bag dust remover, and the separated adsorbent adsorbed with mercury and a small amount of fine ash are captured and enter an adsorbent regeneration system; and the adsorbent regeneration system is used for regenerating and desorbing the adsorbent with mercury and fine ash to obtain mercury and then sending the mercury back to the adsorbent spraying system.
The existing flue gas mercury removal device generally adds an adsorbent into mercury-containing flue gas, and then independently takes out the adsorbent to carry out mercury removal regeneration, so that the purification process is relatively complex and discontinuous, the purification efficiency is low, and long-time discharge and purification of the flue gas are not facilitated.
Disclosure of Invention
In view of the foregoing, it is necessary to provide a synergistic mercury removal and dust removal system for coal-fired power plants, which is used for solving the problems of complex purification process and low purification efficiency of a flue gas mercury removal device.
In one aspect, the invention provides a synergistic mercury removal and dedusting system for a coal-fired power plant, comprising:
The bag type dust collection assembly comprises a dust collection bin and a plurality of bag type dust collectors arranged in the dust collection bin, wherein an adsorbent layer for adsorbing mercury is arranged in the bag type dust collectors, and the bag type dust collectors can separate soot and mercury in flue gas; the dust removal bin is provided with a gas transmission port for blowing high-temperature nitrogen into the dust removal bin, and the high-temperature nitrogen can blow the adsorbent layer of the bag-type dust remover to remove mercury;
The condensing and recycling assembly comprises a condenser, the condenser is communicated with the dust removal bin through a pipeline, and the condenser can condense high-temperature nitrogen passing through the bag-type dust remover and separate mercury in gas.
Further, the bag-type dust collector comprises a filter bag, and the adsorbent layer is arranged on the outer layer of the filter bag so as to isolate dust from the adsorbent layer.
Further, the bag-type dust collector comprises a filter bag with a fiber structure, and the adsorbent layer comprises an adsorbent, and the adsorbent is loaded in the fiber structure of the filter bag.
Further, the bag-type dust collector further comprises a mechanical vibrator, and two ends of the mechanical vibrator are respectively connected with the dust collection bin and the filter bag so as to mechanically vibrate the filter bag to collect dust.
Further, the middle part of the dust removal bin is provided with a separation plate, the separation plate is connected with the inner wall of the dust removal bin, the separation plate separates the inner cavity of the dust removal bin into an upper dust removal chamber and a lower dust collection chamber, the filter bag is arranged in the upper dust removal chamber, the opening of the filter bag is detachably connected with the separation plate, and the inside of the filter bag is communicated with the lower dust collection chamber.
Further, the bottom of the lower dust collecting chamber is provided with an ash outlet, and the ash outlet can discharge accumulated ash from the filter bag.
Further, one side of the lower dust collecting chamber is communicated with the condenser through a pipeline, and an air inlet for inputting mercury-containing flue gas is formed in the other side of the lower dust collecting chamber.
In another aspect, the invention provides a method for collaborative mercury removal and dust removal in a coal-fired power plant, using a collaborative mercury removal and dust removal system for a coal-fired power plant, comprising the steps of:
Synchronous separation of mercury and dust: inputting the flue gas containing mercury into the bag-type dust collector, wherein the bag-type dust collector can separate ash in the flue gas and adsorb the mercury by utilizing an adsorbent layer;
Back-blowing and enriching smoke dust: firstly, blowing air into a gas transmission port of the bag-type dust collector to carry out back-blowing dust removal, so that dust in the bag-type dust collector is enriched at the bottom of the bag-type dust collector and is discharged out of the bag-type dust collector;
and (3) mercury gas back-blowing enrichment: and high-temperature nitrogen is blown into a gas delivery port of the bag-type dust collector to carry out back-blowing mercury removal, so that mercury in the bag-type dust collector enters the condenser along with the nitrogen, and the mercury is removed by condensation.
Further, an openable valve is arranged between the bag-type dust collector and the condenser to control the communication and sealing between the condenser and the bag-type dust collector.
Further, the regeneration condition of the mercury adsorbed in the adsorbent layer is high-temperature heat treatment in a nitrogen atmosphere.
Compared with the prior art, the invention has the following beneficial effects:
According to the collaborative mercury removal and dust removal system and method for the coal-fired power plant, the adsorbent layer capable of adsorbing mercury and the filter bag of the bag-type dust remover are integrated into a whole, so that when flue gas passes through the filter bag, soot can be separated, and mercury in the flue gas can be adsorbed. After the soot is cleaned, the filter bag is blown by high-temperature nitrogen to realize the desorption and enrichment of mercury, the required equipment is simple, the continuous operation can be realized, and the purification efficiency of the flue gas is high.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
Fig. 1 is a schematic structural diagram of a collaborative mercury removal and dust removal system for a coal-fired power plant.
In the figure, 100, a bag type dust removing assembly; 110. a dust removal bin; 111. a gas transfer port; 112. a partition plate; 113. a dust removing chamber; 114. a lower dust collection chamber; 115. an ash outlet; 116. an air inlet; 120. a bag-type dust collector; 121. a filter bag; 122. a mechanical vibrator;
200. a condensation recovery assembly; 210. a condenser; 220. and (3) a valve.
Detailed Description
The following detailed description of preferred embodiments of the application is made in connection with the accompanying drawings, which form a part hereof, and together with the description of the embodiments of the application, are used to explain the principles of the application and are not intended to limit the scope of the application.
A collaborative mercury removal and dust removal system for a coal-fired power plant relates to the technical field of waste gas treatment, and can separate soot and adsorb mercury in flue gas when the flue gas passes through the filter bag 121 by integrating an adsorbent layer capable of adsorbing mercury with the filter bag 121 of a bag-type dust collector 120. After the soot is cleaned, the filter bag 121 is blown by high-temperature nitrogen to realize the desorption and enrichment of mercury, the required equipment is simple, continuous operation can be realized, and the purification efficiency of the flue gas is high.
Referring to fig. 1, a collaborative mercury removal and dust removal system for a coal-fired power plant in this embodiment includes a bag-type dust removal assembly 100 and a condensation recovery assembly 200, wherein the bag-type dust removal assembly 100 can separate soot and adsorb mercury in flue gas, and the condensation recovery assembly 200 can condense high-temperature nitrogen containing mercury and enrich and recover mercury.
The bag-type dust collection assembly 100 comprises a dust collection bin 110 and a plurality of bag-type dust collectors 120, wherein the bag-type dust collectors 120 are arranged in the dust collection bin 110, and an adsorbent layer for adsorbing mercury is arranged in the bag-type dust collectors 120. The bag house 120 can separate soot and adsorb mercury from the flue gas. The dust removal bin 110 is provided with a gas transmission port 111, high-temperature nitrogen can be blown into the dust removal bin 110 from the gas transmission port 111, and the high-temperature nitrogen can blow the adsorbent layer of the bag-type dust remover 120, so that the adsorbent layer adsorbed with mercury is excited to desorb, and the high-temperature nitrogen carries mercury vapor to separate from the bag-type dust remover 120, thereby completing separation and enrichment of mercury and flue gas.
The condensation recovery assembly 200 comprises a condenser 210, the condenser 210 is communicated with the dust bin 110 through a pipeline, high-temperature nitrogen carrying mercury vapor is condensed in the condenser 210, the mercury vapor is liquefied, separated from the nitrogen, and effectively recovered.
In some embodiments, the bag-type dust collector 120 includes a filter bag 121, the adsorbent layer is disposed on an outer layer of the filter bag 121, and the filter bag 121 can separate soot from the flue gas, so that the soot is isolated from the adsorbent layer, and the soot is prevented from invading into the adsorbent layer to interfere with the adsorption of mercury by the adsorbent layer.
In use, the adsorbent layer is a plurality of small bags sewn on the filter bag 121 and containing adsorbent, the small bags are arranged in an array around the surface of the filter bag 121, and the adsorbent can absorb mercury in flue gas passing through the filter bag 121.
The adsorbent layer may also be a cylindrical sleeve that is sleeved outside the filter bag 121, and is filled with an adsorbent that can absorb mercury from the flue gas passing through the filter bag 121.
In some embodiments, the bag-type dust collector 120 comprises a filter bag 121 with a fiber structure, the adsorbent layer comprises an adsorbent, the adsorbent is loaded in the fiber structure of the filter bag 121, and the bag-type dust collector 120 can absorb mercury in flue gas while filtering soot, so that synchronous separation of the two is realized.
What needs to be specifically stated is: common adsorbent materials include activated carbon, zeolites, calcium-based materials, fly ash, and the like. The activated carbon is the adsorption material with the greatest application, and the adsorption capacity and the adsorption rate of the activated carbon can be improved by loading other elements such as sulfur, iron, halogen and the like on the activated carbon, and the highest mercury removal rate can reach 97%. In the application, in order to better absorb the solidified mercury, the adsorption material adopts activated carbon, carbon nano-tubes, alkynyl carbon materials and the like, and the materials can generate better absorption ratio to mercury.
In some embodiments, referring to fig. 1, the bag-type dust collector 120 further includes a mechanical vibrator 122, two ends of the mechanical vibrator 122 are respectively connected with the dust collection bin 110 and the filter bag 121, and the mechanical vibrator 122 is powered to drive the filter bag 121 to vibrate relatively, so that soot adhered to the inner wall of the filter bag 121 is caused to fall off.
In some embodiments, a partition plate 112 is disposed in the middle of the dust bin 110, the partition plate 112 is connected to the inner wall of the dust bin 110, and the inner cavity of the partition plate 112 separating the dust bin 110 is an upper dust chamber 113 and a lower dust chamber 114, where the upper dust chamber 113 and the lower dust chamber 114 are relatively isolated. The filter bag 121 is arranged in the upper dust chamber 113, the opening of the filter bag 121 is detachably connected with the partition plate 112, the inner cavity of the filter bag 121 is communicated with the lower dust chamber 114, the flue gas input from the lower dust chamber 114 enters the upper dust chamber 113 from the filter bag 121, and the flue gas is filtered by the filter bag 121, so that the soot and mercury in the flue gas are separated from the flue gas.
In some embodiments, referring to fig. 1, the bottom of the lower dust chamber 114 is provided with an ash outlet 115, and ash falling from the filter bag 121 is collected at the bottom of the lower dust chamber 114, and the accumulated ash can be discharged through the ash outlet 115, so that the lower dust chamber 114 is kept clean.
As an alternative embodiment, one side of the lower dust chamber 114 is communicated with the condenser 210 through a pipe, and the other side of the lower dust chamber 114 is provided with an air inlet 116 for inputting mercury-containing flue gas. The gas transmission port 111 is communicated with the upper dust removing chamber 113, high-temperature nitrogen is input into the upper dust removing chamber 113 from the gas transmission port 111, and the high-temperature nitrogen reversely blows the filter bag 121 to release mercury adsorbed in the adsorbent for unsealing. The high-temperature nitrogen containing mercury is input into the condenser 210 through a pipe, the condenser 210 cools down the high-temperature nitrogen carrying mercury vapor, the mercury vapor is liquefied, separated from the nitrogen, and effectively recovered.
The supplementary ones are: a filter screen is arranged on a pipeline where the condenser 210 and the lower dust collecting chamber 114 are communicated, and can prevent soot remained in the lower dust collecting chamber 114 from entering the condenser 210 along with high-temperature nitrogen, so that the pollution of the high-temperature nitrogen is avoided, and the high-temperature nitrogen is difficult to recycle. The filter screen can also prevent soot from being doped into liquid mercury, which causes interference to the purity of mercury.
As another alternative embodiment, the air delivery port 111 is in communication with the lower dust chamber 114, and high temperature nitrogen is inputted into the lower dust chamber 114 from the air delivery port 111, and the high temperature nitrogen is positively blown into the filter bag 121, and the filter bag 121 can filter the high temperature nitrogen to prevent the deposited dust from entering the upper dust chamber 113. The adsorbent layer on the filter bag 121 may release mercury adsorbed in the adsorbent to the deblocking under the effect of high temperature nitrogen. One side of the upper dust chamber 113 is communicated with the condenser 210 through a pipeline, high-temperature nitrogen carrying mercury vapor enters the condenser 210 from the upper dust chamber 113, the condenser 210 cools the high-temperature nitrogen carrying mercury vapor, and the mercury vapor is liquefied, separated from the nitrogen and effectively recovered.
In contrast to the first embodiment, soot mixed in high temperature nitrogen gas may be filtered by the filter bag 121, and the soot cannot enter the pipe communicating with the outside, interfering with the operation of the condenser 210.
It should be noted that: a mercury concentration sensor is arranged in the upper dust removing chamber 113, when the mercury concentration exceeds the standard for a short time, the adsorbent in the bag-type dust remover 120 is proved to have complete function, namely high-temperature nitrogen is blown into the gas transmission port 111, the adsorbent layer of the bag-type dust remover 120 is subjected to mercury removal treatment, and the high-temperature nitrogen passing through the bag-type dust remover 120 can be condensed by means of the condenser 210, so that mercury in gas is separated. When the mercury concentration exceeds the standard for a long time, the deactivation of the adsorbent in the bag-type dust collector 120 is proved, and an alarm is given to an operator to remind the operator to replace and regenerate the deactivated adsorbent.
The invention provides a method for synergetic mercury removal and dust removal of a coal-fired power plant, which uses a synergetic mercury removal and dust removal system for the coal-fired power plant, and comprises the following steps:
Step one: the mercury dust is synchronously separated, and the flue gas containing mercury is input into the bag-type dust collector 120, and when the flue gas passes through the bag-type dust collector 120, soot in the flue gas is filtered and attached to the inside of the filter bag 121. The adsorbent layer disposed on the filter bag 121 can adsorb mercury in the flue gas, thereby obtaining clean gas that can be directly discharged.
Step two: the soot is back-blown and enriched, and air is blown into the air inlet 111 of the bag-type dust collector 120 to carry out back-blowing and ash removal, so that soot attached to the inside of the filter bag 121 is cleaned, and the mechanical vibrator 122 can be started at the same time for being matched with the soot to complete thorough cleaning of the filter bag 121. The dust is concentrated at the bottom of the bag house 120, and all the deposited dust can be discharged to the outside of the lower dust chamber 114 through the dust outlet 115. An openable valve 220 is arranged between the bag-type dust collector 120 and the condenser 210, and when air is blown into the air delivery port 111, the valve 220 is closed, so that soot is prevented from entering the condenser 210. When high-temperature nitrogen is blown into the gas inlet 111, the valve 220 is opened, and the high-temperature flue gas carrying mercury vapor can smoothly enter the condenser 210 through the pipeline.
Step three: the mercury gas is reversely blown and enriched, high-temperature nitrogen is blown into the gas delivery port 111 of the bag-type dust collector 120 to reversely blow and remove mercury, and when the high-temperature nitrogen passes through the filter bag 121, the mercury adsorbed on the adsorption layer is thermally treated in the nitrogen atmosphere, and the mercury adsorbed in the adsorbent layer is regenerated and desorbed to release mercury vapor. The mercury vapor enters condenser 210 with nitrogen gas, condensing to remove mercury.
While the invention has been described with respect to the preferred embodiments, the scope of the invention is not limited thereto, and any changes or substitutions that would be apparent to those skilled in the art are intended to be included within the scope of the invention.
Claims (10)
1. A collaborative mercury removal and dust removal system for a coal-fired power plant, comprising:
The bag type dust collection assembly comprises a dust collection bin and a plurality of bag type dust collectors arranged in the dust collection bin, wherein an adsorbent layer for adsorbing mercury is arranged in the bag type dust collectors, and the bag type dust collectors can separate soot and mercury in flue gas; the dust removal bin is provided with a gas transmission port for blowing high-temperature nitrogen into the dust removal bin, and the high-temperature nitrogen can blow the adsorbent layer of the bag-type dust remover to remove mercury;
The condensing and recycling assembly comprises a condenser, the condenser is communicated with the dust removal bin through a pipeline, and the condenser can condense high-temperature nitrogen passing through the bag-type dust remover and separate mercury in gas.
2. The collaborative mercury removal and dust removal system for a coal fired power plant of claim 1, wherein the bag house comprises a filter bag, the sorbent layer is disposed on an outer layer of the filter bag for separating dust from the sorbent layer.
3. The collaborative mercury removal and dust removal system for a coal fired power plant of claim 1, wherein the bag house comprises a filter bag having a fibrous structure, the sorbent layer comprising a sorbent supported in the fibrous structure of the filter bag.
4. A synergistic mercury removal and dust removal system for coal fired power plants as claimed in claim 2 or 3, wherein the bag house further comprises a mechanical vibrator, both ends of which are connected to the dust removal bin and the filter bag, respectively, for mechanically vibrating the filter bag for dust removal.
5. The collaborative mercury removal and dust removal system for a coal-fired power plant according to claim 4, wherein a partition plate is arranged in the middle of the dust removal bin, the partition plate is connected with the inner wall of the dust removal bin, an inner cavity of the partition plate separating the dust removal bin is an upper dust removal chamber and a lower dust collection chamber, a filter bag is arranged in the upper dust removal chamber, an opening of the filter bag is detachably connected with the partition plate, and the interior of the filter bag is communicated with the lower dust collection chamber.
6. The collaborative mercury removal and dust removal system for a coal fired power plant according to claim 5, wherein the bottom of the lower dust collection chamber is provided with an ash outlet capable of discharging accumulated ash from the filter bag.
7. The collaborative mercury removal and dust removal system for a coal-fired power plant according to claim 5, wherein one side of the lower dust collection chamber is communicated with the condenser through a pipeline, and the other side of the lower dust collection chamber is provided with an air inlet for inputting mercury-containing flue gas.
8. A method for collaborative mercury removal and dust removal in a coal fired power plant using a collaborative mercury removal and dust removal system for a coal fired power plant according to any of claims 1-7, comprising the steps of:
Synchronous separation of mercury and dust: inputting the flue gas containing mercury into the bag-type dust collector, wherein the bag-type dust collector can separate ash in the flue gas and adsorb the mercury by utilizing an adsorbent layer;
Back-blowing and enriching smoke dust: firstly, blowing air into a gas transmission port of the bag-type dust collector to carry out back-blowing dust removal, so that dust in the bag-type dust collector is enriched at the bottom of the bag-type dust collector and is discharged out of the bag-type dust collector;
and (3) mercury gas back-blowing enrichment: and high-temperature nitrogen is blown into a gas delivery port of the bag-type dust collector to carry out back-blowing mercury removal, so that mercury in the bag-type dust collector enters the condenser along with the nitrogen, and the mercury is removed by condensation.
9. The method for collaborative mercury removal and dust removal in a coal-fired power plant according to claim 8, wherein an openable and closable valve is provided between the bag-type dust remover and the condenser for controlling the communication and closure of the condenser and the bag-type dust remover.
10. The method for collaborative mercury removal and dust removal in a coal fired power plant according to claim 8, wherein the regeneration condition of mercury adsorbed in the adsorbent layer is a high temperature heat treatment in a nitrogen atmosphere.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118286782A true CN118286782A (en) | 2024-07-05 |
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