CN105905923A - A method of producing ammonium bicarbonate by adopting carbon dioxide in boiler tail gas - Google Patents
A method of producing ammonium bicarbonate by adopting carbon dioxide in boiler tail gas Download PDFInfo
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- CN105905923A CN105905923A CN201610241513.0A CN201610241513A CN105905923A CN 105905923 A CN105905923 A CN 105905923A CN 201610241513 A CN201610241513 A CN 201610241513A CN 105905923 A CN105905923 A CN 105905923A
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- flue gas
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/26—Carbonates or bicarbonates of ammonium
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Abstract
A method of producing ammonium bicarbonate by adopting carbon dioxide in boiler tail gas is disclosed. The method includes spraying pulverized coal into a fluidized bed boiler combustion chamber through a pulverized coal combuster to form fluidized combustion, pumping a proper amount of flue gas discharged from the fluidized bed boiler through a circulating flue gas draught fan, mixing with oxygen, and mixing with air at an outlet of an air blower, wherein the mixture is adopted as a combustion-supporting gas of the fluidized bed boiler, and the amount of the compressed air of the air blower is adjusted along with the amount of circulating flue gas. When the CO2 concentration of the flue gas discharged by the fluidized bed boiler is not less than a concentration available for customers through adjusting the circulating amount and the oxygen adding amount, the rest of the flue gas is subjected to desulfuration and other treatment, is compressed, and then is fed into a production process of the ammonium bicarbonate.
Description
Technical field
The present invention relates to produce the production method of ammonium hydrogencarbonate, a kind of method being specifically related to carbon dioxide production ammonium hydrogencarbonate used in boiler exhaust gas.
Background technology
Ammonium hydrogen carbonate produces to be needed to consume a large amount of CO2, but owing to the impact of gas chemical industry's plant matching degree cannot provide enough CO2 by process gas, natural gas chemical plant many times needs to purchase CO2 product or arranges large-scale CO2 liquefaction and store device and gasification installation with demand to CO2 product in satisfied production.
Containing a large amount of concentration in the flue gas that conventional coal powder injection boiler and natural gas boiler produce is the CO2 of about 10%, can be not applied directly to ammonium hydrogen carbonate production procedure owing to concentration is relatively low, arranges only as outside waste gas.Boiler combustion generally uses air-breathing mode, and has the nitrogen of up to 78% in air, therefore effectively utilizes and have in terms of environmental conservation following problem at the energy:
1, high owing to air not participated in nitrogen content of reaction, make that flue gas has substantial amounts of nitrogen, although through heat exchange, but still take away a part of heat, reduce the heat utilization efficiency of coal；2, owing to flue gas containing substantial amounts of nitrogen, add exhaust gas volumn, make treatment quantity increase, increase fume treatment cost；3, owing to flue gas containing substantial amounts of nitrogen, make the CO2 content in flue gas relatively low, generally 10-13%, it is impossible to be effectively used in follow-up carbon dioxide recovery.
Summary of the invention
For above-mentioned deficiency of the prior art, the method of what the present invention provided the use carbon dioxide production ammonium hydrogencarbonate in boiler exhaust gas, by being passed through oxygen in the flue gas of circulation extraction to improve the carbon dioxide content in the flue gas that boiler produces, carries out the purpose of ammonium hydrogencarbonate production to reach to directly utilize the flue gas containing high concentration carbon dioxide.
In order to reach foregoing invention purpose, the technical solution used in the present invention is:
A kind of method improving carbon dioxide production ammonium hydrogencarbonate used in boiler exhaust gas, it comprises the following steps:
Coal dust is sprayed into burning in circulating fluid bed boiler indoor formation fluidized bed combustion by powdered coal burner；
The flue gas discharged by circulating flue gas blower fan extraction fluidized-bed combustion boiler, and air with air-blaster outlet mixes the combustion-supporting gas as fluidized-bed combustion boiler after being mixed into oxygen；
When adjusting the CO in the flue gas that fluidized-bed combustion boiler is discharged by adjustment circulating load and oxygen-adding amount2When concentration is more than or equal to 15%, remaining flue gas is carried out desulfurization etc. and processes and carry out after compression the production of ammonium hydrogencarbonate.
The invention have the benefit that by being passed through oxygen in the boiler smoke of circulation extraction to improve the carbon dioxide content in the flue gas that boiler produces, carry out the purpose of ammonium hydrogencarbonate production to reach to directly utilize the flue gas containing high concentration carbon dioxide；Nitrogen ratios in combustion-supporting gas can be reduced by being passed through oxygen, improve CO in flue gas2Content, reaches ammonium hydrogencarbonate and produces utilizable purity, improves the recovery value of available material, and reducing ammonium hydrogencarbonate production process needs outsourcing CO2Production cost.
Exhaust gas volumn can also be reduced simultaneously, improve fuel utilization efficiency, reduce treatment quantity, reduce processing cost, reduce or eliminate the carbon dioxide in final discharge gas；Oxygen-enriched boiler technology is utilized to make the coal powder injection CFBB of natural gas chemical plant provide adjustable concentration CO for follow-up carbamide or triamine chemical fertilizer production flow process2Product, to realize coal powder injection recirculating fluidized bed pot boiler smoke zero-emission, to fully meet CO in carbamide, triamine chemical fertilizer production2Demand, makes gas chemical industry reach an economical operating point in environmental protection, energy-saving and emission-reduction.
Accompanying drawing explanation
Fig. 1 is the flow chart of the method using the carbon dioxide production ammonium hydrogencarbonate in boiler exhaust gas.
Detailed description of the invention
Below the detailed description of the invention of the present invention is described; so that those skilled in the art understand the present invention; it is to be understood that; the invention is not restricted to the scope of detailed description of the invention; from the point of view of those skilled in the art; as long as various changes limit and in the spirit and scope of the present invention that determine, these changes are apparent from, and all utilize the innovation and creation of present inventive concept all at the row of protection in appended claim.
With reference to Fig. 1, the method for the carbon dioxide production ammonium hydrogencarbonate in this employing boiler exhaust gas comprises the following steps:
Coal dust is sprayed into burning in circulating fluid bed boiler indoor formation fluidized bed combustion by powdered coal burner；
The flue gas discharged by circulating flue gas blower fan extraction fluidized-bed combustion boiler, and air with air-blaster outlet mixes the combustion-supporting gas as fluidized-bed combustion boiler after being mixed into oxygen；
When adjusting the CO in the flue gas that fluidized-bed combustion boiler is discharged by adjustment circulating load and oxygen-adding amount2When concentration is more than or equal to customer demand concentration 15%, remaining flue gas is carried out desulfurization etc. and processes and carry out after compression the production of ammonium hydrogencarbonate.
CO in the flue gas that fluidized-bed combustion boiler is discharged2When concentration is adjusted, when concentration general control is in the range of 15% ~ 30%, use the CO in the flue gas of rectification fluidized bed boiler discharge2The production carrying out ammonium hydrogencarbonate is most cost-saving, the CO in the flue gas discharged2When concentration is higher than 30%, its production cost can be greatly improved, and the CO in the flue gas discharged2When concentration is less than 15%, to CO when not reaching the production of ammonium hydrogencarbonate2Requirement, then there is no value.
In one embodiment of the invention, when carrying out ammonium hydrogencarbonate and producing, the consideration of production cost when oxygen-enriched operation, the CO in the flue gas that fluidized-bed combustion boiler is discharged2The production of ammonium hydrogencarbonate is carried out again when concentration is preferably controlled at 25% ~ 30%；CO in the flue gas that fluidized-bed combustion boiler is discharged2When concentration is more than or equal to 25%, when preferably entering each half of flue gas of circulating flue gas blower fan and ammonium hydrogencarbonate production procedure, best results.
In one embodiment of the invention, use when being mixed into oxygen as the combustion-supporting gas of CFBB and mix oxygen operation for twice: the most mixed oxygen operation is to be mixed by the flow-rate ratio of 1:4 ~ 8 with the flue gas of extraction by oxygen, second time mixed oxygen operation is to add air to mixed gas, until the pressure of combustion-supporting gas is equal to the pressure in CFBB.It is that 0.15MPa ~ 0.25MPa entrance regulation system mixes with the flue gas of extraction that oxygen is compressed to pressure through compressor.
Owing to oxygen and circulating flue gas flow-rate ratio are 1:4 ~ 8, circulating flue gas temperature is about 150 DEG C, in order to ensure good mixed effect, use Cross_mixer plug-in type adverse current blender to be diluted mixing during the most mixed oxygen operation, carry out repeatedly dilution mixture to ensure safety during mixing by 30-30-30 angle bilayer cross-distribution.
Second time mixed oxygen operation uses pressure reduction fuzzy hybrid mode, based on pressure reduction fuzzy hybrid, ensure that mixing the mixed gas after oxygen has operated for the first time realizes minimum suction pressure reduction as main gas by installation site, second time mixed oxygen operation utilizes air air-introduced machine to have suction by oneself and is sucked as supplementary combustion adjuvant by peripheral air, and main suction and the pressure reduction time sucked are designed as the pressure reduction of 30Pa by the resistance of ducting.
With typical condition as example: require as 16831Nm3/H for gas flow in ensureing fluid bed operating mode fluidized-bed combustion boiler, circulating combustion add mixed once gas flow after oxygen be 9039Nm3/H(wherein amount of circulating gas be 7578Nm3/H, pure oxygen amount is 1460Nm3/H), supplementary air imbibed quantity is 7792Nm3/H, twice mixed mixed gas total amount is still for 16831Nm3/H (utilizing the principle that the change of air air-introduced machine inlet pressure is little), wherein the most mixed oxygen operation is due to suction resistance minimum, first sucked by air air-introduced machine, the air that second time mixed oxygen operation is mixed into sucks under the effect of air air-introduced machine import negative pressure and supplements.
In another embodiment of the present invention, the production carrying out ammonium hydrogencarbonate after remaining flue gas carries out desulfurization process and compression process farther includes:
After remaining flue gas feeding caustic wash desulfuration tower is carried out desulfurization process, enter the first flue gas compressor and be compressed processing；Flue gas after compressed process is sent into the second flue gas compressor after carrying out dedusting and secondary desulfuration process and is boosted to 0.7MPa, sends into ammonium hydrogen carbonate synthesis system as unstripped gas afterwards and carries out the production of ammonium hydrogencarbonate.
The SO2 that entrance caustic wash desulfuration tower can be carried out in the flue gas of ammonium hydrogencarbonate production by caustic wash desulfuration tower is carried out, avoid causing SO2 corrosive liquids to separate out in the compression process of the first flue gas compressor, after caustic wash desulfuration tower carries out desulfurization process, SO2 in flue gas is greatly reduced, volume and the flow velocity of flue gas are significantly reduced, after the flue gas containing SO2 of high concentration low flow velocity contacts with alkali wash water, desulfuration efficiency brings up to 94% from original 74%.
Alkali liquor is distributed by the alkali cleaning liquid distribution trough that caustic wash desulfuration tower is arranged by its top, the temperature after exhanst gas outlet caustic wash desulfuration tower can be reduced after so arranging, relatively low flue-gas temperature can improve the efficiency of the first flue gas compressor, based on equation for ideal gases, after temperature reduces, operating mode density increases, first flue gas compressor flow increases, thus reduces energy consumption and away from surge interval.
The first flue gas compressor and the second flue gas compressor in this programme all use turbocompressor；Owing to turbocompressor is based on isotherm compression, reducing gas approach temperature, flue gas compressor unit consumption is greatly reduced, and can be reduced to 0.09kw/Nm3 from original 0.12kw/Nm3.
The pressure regulating butterfly valve of regulation the first flue gas compressor extraction exhaust gas volumn it is provided with before the first flue gas compressor import；When the first flue gas compressor extraction amount is excessive, or when fluidized-bed combustion boiler outlet pressure negative pressure occurring due to fluidized-bed combustion boiler production adjustment, the extraction amount of the first flue gas compressor can be reduced to ensure fluidized-bed combustion boiler and circulating flue gas pressure stability by adjusting pressure regulating butterfly valve.
It is provided with bypass valve between the first flue gas compressor import and outlet；In order to avoid causing flue gas compressor surge when pressure-regulating valve cuts out, the bypass valve of setting can be by flue gas compressor and make outlet and import UNICOM.
In sum, after adding oxygen, decrease the nitrogen in combustion-supporting gas, decrease tail gas amount, decrease the heat that tail gas is taken away, improve fuel availability；Reduce nitrogen content in the combustion-supporting gas air of entrance boiler, improve the water in tail gas, CO2 content, improve the thermal radiation capability of tail gas.Owing to tail gas reduces, after-treatment system load reduction, improve the effect of oxynitride removing；By oxygen-adding amount and circulating load are controlled, the CO2 content in regulation tail gas, reach available concentration, meet triamine, the available concentration of carbamide, exhaust emissions amount is finally reduced or eliminated.
Claims (5)
1. the method for the carbon dioxide production ammonium hydrogencarbonate in employing boiler exhaust gas, it is characterised in that comprise the following steps:
Coal dust is sprayed into burning in circulating fluid bed boiler indoor formation fluidized bed combustion by powdered coal burner；
The flue gas discharged by circulating flue gas blower fan extraction fluidized-bed combustion boiler, and air with air-blaster outlet mixes the combustion-supporting gas as fluidized-bed combustion boiler after being mixed into oxygen；
When by adjusting circulating load and oxygen-adding amount, adjust the CO in the flue gas that fluidized-bed combustion boiler is discharged2Remaining flue gas, more than when waiting 15%, is carried out desulfurization etc. and processes and enter after compression the production of ammonium hydrogencarbonate by concentration.
The method of the carbon dioxide production ammonium hydrogencarbonate in employing boiler exhaust gas the most according to claim 1, it is characterised in that described in be mixed into oxygen and mix oxygen operation for twice as using during the combustion-supporting gas of CFBB:
The most mixed oxygen operation is to be mixed by the flow-rate ratio of 1:4 ~ 8 with the flue gas of extraction by oxygen, and second time mixed oxygen operation is to add air to mixed gas, until the pressure of combustion-supporting gas is equal to the pressure in CFBB.
The method of the carbon dioxide production ammonium hydrogencarbonate in employing boiler exhaust gas the most according to claim 2, it is characterized in that, use plug-in type adverse current blender to be diluted mixing during the most mixed oxygen operation, carry out repeatedly dilution mixture by 30-30-30 angle bilayer cross-distribution.
4. according to the method for the arbitrary described carbon dioxide production ammonium hydrogencarbonate used in boiler exhaust gas of claim 1-3, it is characterised in that described remaining flue gas is carried out desulfurization process and compression process after carry out the production of ammonium hydrogencarbonate and farther include:
After remaining flue gas feeding caustic wash desulfuration tower is carried out desulfurization process, enter the first flue gas compressor and be compressed processing；Flue gas after compressed process is sent into the second flue gas compressor after carrying out dedusting and secondary desulfuration process and is boosted to 0.7MPa, sends into ammonium hydrogen carbonate synthesis system as unstripped gas and carries out the production of ammonium hydrogencarbonate.
The method of the carbon dioxide production ammonium hydrogencarbonate in employing boiler exhaust gas the most according to claim 4, it is characterised in that alkali liquor is distributed by the alkali cleaning liquid distribution trough that described caustic wash desulfuration tower is arranged by its top.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109539248A (en) * | 2018-12-13 | 2019-03-29 | 江苏徐工工程机械研究院有限公司 | A kind of burner air distribution device and air distribution method |
| CN112361834A (en) * | 2020-11-09 | 2021-02-12 | 江苏宇力节能科技有限公司 | Method for improving concentration of carbon dioxide in flue gas |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101497452A (en) * | 2008-01-28 | 2009-08-05 | 刘键 | Method for preparing ammonium acid carbonate using flue gas and equipment thereof |
| CN101857246A (en) * | 2010-06-28 | 2010-10-13 | 董继文 | Process method for co-producing ammonium bicarbonate by using coking plant waste |
| US20110061533A1 (en) * | 2009-09-15 | 2011-03-17 | Black Sean E | Method and system for removal of carbon dioxide from a process gas |
| CN102425789A (en) * | 2011-11-03 | 2012-04-25 | 华北电力大学（保定） | Coal-fired fluidized bed micro oxygen rich combustion CO2 emission reduction method and system |
| CN102635873A (en) * | 2011-02-09 | 2012-08-15 | 熊正毅 | Method for capturing and circulating carbon dioxide in ordinary power plant boiler |
| US20140109575A1 (en) * | 2012-10-22 | 2014-04-24 | Fluor Technologies Corporation | Method for reducing flue gas carbon dioxide emissions |
-
2016
- 2016-04-19 CN CN201610241513.0A patent/CN105905923B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101497452A (en) * | 2008-01-28 | 2009-08-05 | 刘键 | Method for preparing ammonium acid carbonate using flue gas and equipment thereof |
| US20110061533A1 (en) * | 2009-09-15 | 2011-03-17 | Black Sean E | Method and system for removal of carbon dioxide from a process gas |
| CN101857246A (en) * | 2010-06-28 | 2010-10-13 | 董继文 | Process method for co-producing ammonium bicarbonate by using coking plant waste |
| CN102635873A (en) * | 2011-02-09 | 2012-08-15 | 熊正毅 | Method for capturing and circulating carbon dioxide in ordinary power plant boiler |
| CN102425789A (en) * | 2011-11-03 | 2012-04-25 | 华北电力大学（保定） | Coal-fired fluidized bed micro oxygen rich combustion CO2 emission reduction method and system |
| US20140109575A1 (en) * | 2012-10-22 | 2014-04-24 | Fluor Technologies Corporation | Method for reducing flue gas carbon dioxide emissions |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109539248A (en) * | 2018-12-13 | 2019-03-29 | 江苏徐工工程机械研究院有限公司 | A kind of burner air distribution device and air distribution method |
| CN109539248B (en) * | 2018-12-13 | 2023-09-05 | 江苏徐工工程机械研究院有限公司 | Air distribution device and air distribution method for combustor |
| CN112361834A (en) * | 2020-11-09 | 2021-02-12 | 江苏宇力节能科技有限公司 | Method for improving concentration of carbon dioxide in flue gas |
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Effective date of registration: 20180208 Address after: No. 1196, hundred grass road, hi-tech West District, Chengdu, Sichuan Applicant after: Sichuan Messer Gas Products Co., Ltd. Address before: The town of Qingbaijiang District of Chengdu road along the unity of 610300 cities in Sichuan Province Applicant before: Chengdu Chenggang Meisaier Gas Products Co., Ltd. |
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