CN105905923B - Using the method for the carbon dioxide production ammonium hydrogencarbonate in boiler exhaust gas - Google Patents
Using the method for the carbon dioxide production ammonium hydrogencarbonate in boiler exhaust gas Download PDFInfo
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- CN105905923B CN105905923B CN201610241513.0A CN201610241513A CN105905923B CN 105905923 B CN105905923 B CN 105905923B CN 201610241513 A CN201610241513 A CN 201610241513A CN 105905923 B CN105905923 B CN 105905923B
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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
The invention discloses the method using the carbon dioxide production ammonium hydrogencarbonate in boiler exhaust gas, it comprises the following steps：Coal dust is sprayed into fluidized-bed combustion boiler combustion chamber by powdered coal burner and forms fluidized bed combustion；The flue gas of appropriate fluidized-bed combustion boiler discharge is extracted by circulating flue gas blower fan, and is mixed after being mixed into oxygen with air-blaster outlet air, the combustion-supporting gas as fluidized-bed combustion boiler；The air supply of air-blaster carries out matching regulation with amount of circulating gas；CO in the flue gas by adjusting internal circulating load and oxygen-adding amount adjustment fluidized-bed combustion boiler discharge2When concentration is more than or equal to client's available concentration, remaining flue gas carries out the production procedure for entering ammonium hydrogencarbonate after the processing such as desulfurization and compression.
Description
Technical field
The present invention relates to the production method of production ammonium hydrogencarbonate, and in particular to a kind of carbon dioxide using in boiler exhaust gas
The method for producing ammonium hydrogencarbonate.
Background technology
Ammonium hydrogen carbonate production needs to consume a large amount of CO2, but because natural gas chemical plant's equipment matching degree influences to lead to
Cross process gas and enough CO2 are provided, natural gas chemical plant many times needs to purchase CO2 products or set large-scale
CO2 liquefies storage device and gasification installation to meet in production the needs of to CO2 products.
Containing the CO2 that a large amount of concentration are 10% or so in flue gas caused by conventional coal powder injection boiler and natural gas boiler, due to dense
Spend it is relatively low can be not applied directly to ammonium hydrogen carbonate production procedure, can only be used as waste gas outside arrange.Boiler combustion generally use air helps
The mode of combustion, and have up to 78% nitrogen in air, thus the energy effectively using and environmental protection in terms of have following problem：
1st, because the nitrogen content for not participating in reaction in air is high, make have substantial amounts of nitrogen in flue gas, although by exchanging heat,
But a part of heat is still taken away, reduces the heat utilization efficiency of coal；2nd, due to containing substantial amounts of nitrogen in flue gas, flue gas is added
Amount, increases treatment quantity, increases fume treatment cost；3rd, due to containing substantial amounts of nitrogen in flue gas, the CO2 in flue gas is made
Content is relatively low, generally 10-13%, it is impossible to is effectively used in follow-up carbon dioxide recovery.
The content of the invention
For above-mentioned deficiency of the prior art, the carbon dioxide production carbonic acid provided by the invention using in boiler exhaust gas
The method of hydrogen ammonia by circulation extract flue gas in be passed through oxygen to improve the carbon dioxide content in flue gas caused by boiler,
To reach the purpose that ammonium hydrogencarbonate production is directly carried out using the flue gas containing high concentration carbon dioxide.
In order to reach foregoing invention purpose, the technical solution adopted by the present invention is：
A kind of method of the carbon dioxide production ammonium hydrogencarbonate using in boiler exhaust gas is improved, it comprises the following steps：
Coal dust is sprayed into burning in circulating fluid bed boiler room by powdered coal burner and forms fluidized bed combustion；
The flue gas of fluidized-bed combustion boiler discharge is extracted by circulating flue gas blower fan, and is mixed into oxygen and goes out afterwards with air-blaster
The air of mouth mixes the combustion-supporting gas as fluidized-bed combustion boiler；
CO in the flue gas by adjusting internal circulating load and oxygen-adding amount adjustment fluidized-bed combustion boiler discharge2Concentration is more than or equal to
When 15%, remaining flue gas is carried out to the production of progress ammonium hydrogencarbonate after the processing such as desulfurization and compression.
Beneficial effects of the present invention are：By being passed through oxygen into the boiler smoke of circulation extraction to improve caused by boiler
Carbon dioxide content in flue gas, directly ammonium hydrogencarbonate production is carried out using the flue gas containing high concentration carbon dioxide to reach
Purpose；Nitrogen ratios in combustion-supporting gas can be reduced by being passed through oxygen, improve CO in flue gas2Content, reach ammonium hydrogencarbonate life
Utilizable purity is produced, improves the recovery value that can utilize material, reducing ammonium hydrogencarbonate production process needs outsourcing CO2's
Production cost.
Exhaust gas volumn can also be reduced simultaneously, improves fuel utilization efficiency, reduces treatment quantity, reduce processing cost, drop
Carbon dioxide in the low or final discharge gas of elimination；Make the coal powder injection of natural gas chemical plant ciculation fluidized using oxygen-enriched boiler technology
Bed boiler provides adjustable concentration CO for follow-up urea or triamine chemical fertilizer production flow2Product, to realize coal powder injection recirculating fluidized bed
The zero-emission of pot boiler smoke, fully meet CO in urea, triamine chemical fertilizer production2Demand, gas chemical industry is set to subtract in environmental protection, energy-conservation
Reach an economical operating point on row.
Brief description of the drawings
Fig. 1 is the flow chart using the method for the carbon dioxide production ammonium hydrogencarbonate in boiler exhaust gas.
Embodiment
The embodiment of the present invention is described below, in order to which those skilled in the art understand this hair
It is bright, it should be apparent that the invention is not restricted to the scope of embodiment, for those skilled in the art,
As long as various change in the spirit and scope of the present invention that appended claim limits and determines, these changes are aobvious and easy
See, all are using the innovation and creation of present inventive concept in the row of protection.
With reference to figure 1, this uses the method for the carbon dioxide production ammonium hydrogencarbonate in boiler exhaust gas to comprise the following steps：
Coal dust is sprayed into burning in circulating fluid bed boiler room by powdered coal burner and forms fluidized bed combustion；
The flue gas of fluidized-bed combustion boiler discharge is extracted by circulating flue gas blower fan, and is mixed into oxygen and goes out afterwards with air-blaster
The air of mouth mixes the combustion-supporting gas as fluidized-bed combustion boiler；
CO in the flue gas by adjusting internal circulating load and oxygen-adding amount adjustment fluidized-bed combustion boiler discharge2Concentration is more than or equal to visitor
During the demand concentration 15% of family, remaining flue gas is carried out to the production of progress ammonium hydrogencarbonate after the processing such as desulfurization and compression.
CO in the flue gas discharged to fluidized-bed combustion boiler2When concentration is adjusted, concentration general control is in 15% ~ 30% model
When enclosing interior, using the CO in the flue gas of rectification fluidized bed boiler discharge2The production for carrying out ammonium hydrogencarbonate is most cost-saving, works as row
CO in the flue gas gone out2When concentration is higher than 30%, its production cost can be greatly improved, and the CO in the flue gas discharged2Concentration
During less than 15%, to CO when not reaching the production of ammonium hydrogencarbonate2Requirement, then without value.
In one embodiment of the invention, when carrying out ammonium hydrogencarbonate production, examined from production cost during oxygen-enriched operation
Consider, by the CO in the flue gas of fluidized-bed combustion boiler discharge2The life of ammonium hydrogencarbonate is carried out when concentration is preferably controlled at 25% ~ 30% again
Production；CO in the flue gas of fluidized-bed combustion boiler discharge2When concentration is more than or equal to 25%, circulating flue gas blower fan and carbonic acid are preferably entered
During each half of the flue gas of hydrogen ammonia production procedure, best results.
In one embodiment of the invention, two are used when being mixed into combustion-supporting gas of the oxygen as CFBB
Secondary mixed oxygen operation：Mixed oxygen operation is by 1 by oxygen and the flue gas extracted for the first time:4 ~ 8 flow-rate ratio is mixed, and second mixed
Oxygen operation is to add air to mixed gas, until the pressure of combustion-supporting gas is equal to the pressure in CFBB.Oxygen
Pressure is compressed to through compressor to mix with the flue gas extracted into regulating system for 0.15MPa ~ 0.25MPa.
Because oxygen and circulating flue gas flow-rate ratio are 1:4 ~ 8, circulating flue gas temperature is 150 DEG C or so, good in order to ensure
Mixed effect, mixing is diluted using Cross_mixer plug-in type adverse current blenders during mixed oxygen operation for the first time, passed through
30-30-30 angle bilayers cross-distribution carries out repeatedly dilution mixing to ensure security during mixing.
Second of mixed oxygen operation uses pressure difference fuzzy hybrid mode, based on pressure difference fuzzy hybrid, is ensured by installation site
The mixed gas after the completion of mixed oxygen operation realizes minimum suction pressure difference as main gas for the first time, and second of mixed oxygen operation utilizes
Air air-introduced machine has suction by oneself using the air of periphery as supplement combustion adjuvant suction, and main suction and time pressure difference of suction are passed through into pipe
Road resistance is designed as 30Pa pressure difference.
Using typical condition as example：To ensure that gas flow requirement is 16831Nm3/ in fluid bed operating mode fluidized-bed combustion boiler
H, a mixed gas amount is 9039Nm3/H after circulating combustion adds oxygen（Wherein amount of circulating gas is 7578Nm3/H, pure oxygen
Measure as 1460Nm3/H）, supplement air imbibed quantity is 7792Nm3/H, and mixed mixed gas total amount is still twice
16831Nm3/H (changes little principle using air air-introduced machine inlet pressure), wherein mixed oxygen operation for the first time is hindered due to suction
Power is minimum, is sucked first by air air-introduced machine, and second of mixed oxygen operates work of the mixed air in air air-introduced machine import negative pressure
Supplemented with lower suction.
In another embodiment of the present invention, carbonic acid is carried out after remaining flue gas being carried out into desulfurization process and compression processing
The production of hydrogen ammonia further comprises：
After remaining flue gas is sent into caustic wash desulfuration tower progress desulfurization process, place is compressed into the first flue gas compressor
Reason；The second flue gas compressor, which is sent into, after flue gas progress dedusting and secondary desulfuration processing after compressed processing boosts to 0.7MPa,
The production of ammonium hydrogen carbonate synthesis system progress ammonium hydrogencarbonate is sent into as unstripped gas afterwards.
The SO2 that caustic wash desulfuration tower can be carried out to entering caustic wash desulfuration tower in the flue gas of ammonium hydrogencarbonate production is cleaned,
Avoid causing SO2 corrosive liquids to separate out in the compression process of the first flue gas compressor, carried out through caustic wash desulfuration tower at desulfurization
After reason, the SO2 in flue gas is greatly reduced, and the volume and flow velocity of flue gas are significantly reduced, and high concentration low flow velocity contains
After SO2 flue gases contact with alkali wash water, desulfuration efficiency brings up to 94% from original 74%.
The alkali cleaning liquid distribution trough that caustic wash desulfuration tower is set by its top is distributed to alkali lye, can be with after so setting
The temperature after exhanst gas outlet caustic wash desulfuration tower is reduced, relatively low flue-gas temperature can improve the efficiency of the first flue gas compressor, base
In equation for ideal gases, operating mode density increase after temperature reduces, the increase of the first flue gas compressor flow, so as to reduce energy consumption and
Away from surge section.
The first flue gas compressor and the second flue gas compressor in this programme use turbocompressor；Due to turbo compressor
Machine is based on isotherm compression, reduces gas approach temperature, and flue gas compressor unit consumption is greatly reduced, can dropped from original 0.12kw/Nm3
It is low to arrive 0.09kw/Nm3.
The pressure regulation butterfly that the first flue gas compressor of regulation extracts exhaust gas volumn is provided with before the first flue gas compressor import
Valve；When the first flue gas compressor extraction amount is excessive, or because fluidized-bed combustion boiler outlet pressure occurs in fluidized-bed combustion boiler production adjustment
During power negative pressure, by adjust pressure regulating butterfly valve can reduce the extraction amount of the first flue gas compressor with ensure fluidized-bed combustion boiler with
And circulating flue gas pressure stability.
Bypass valve is provided between the first flue gas compressor import and outlet；In order to avoid pressure-regulating valve is closed
When cause flue gas compressor surge, the bypass valve of setting by flue gas compressor and can make outlet and import UNICOM.
In summary, after adding oxygen, reduce the nitrogen in combustion-supporting gas, reduce tail gas amount, reduce tail gas band
The heat walked, improves fuel availability；Reduce into boiler combustion-supporting gas air in nitrogen content, improve tail gas in water,
CO2 contents, improve the thermal radiation capability of tail gas.Because tail gas is reduced, after-treatment system load reduction, nitrogen oxidation conjunction is improved
The effect of thing removing；By controlling oxygen-adding amount and internal circulating load, the CO2 contents in tail gas are adjusted, reach available concentration, it is full
The available concentration of sufficient triamine, urea, finally reduces or eliminates exhaust emissions amount.
Claims (2)
1. using the method for the carbon dioxide production ammonium hydrogencarbonate in boiler exhaust gas, it is characterised in that comprise the following steps：
Coal dust is sprayed into burning in circulating fluid bed boiler room by powdered coal burner and forms fluidized bed combustion；
The flue gas of fluidized-bed combustion boiler discharge is extracted by circulating flue gas blower fan, and is mixed into the sky after oxygen with air-blaster outlet
Gas mixes the combustion-supporting gas as fluidized-bed combustion boiler；
It is described be mixed into oxygen as CFBB combustion-supporting gas when using twice mix oxygen operation：
Mixed oxygen operation is by 1 by oxygen and the flue gas extracted for the first time:4~8 flow-rate ratio is mixed, second of mixed oxygen operation
It is to add air to mixed gas, until the pressure of combustion-supporting gas is equal to the pressure in CFBB；
Mixing is diluted using plug-in type adverse current blender during mixed oxygen operation for the first time, intersected by the way that 30-30-30 angles are double-deck
Distribution carries out repeatedly dilution mixing；Second of mixed oxygen operation uses pressure difference fuzzy hybrid mode；
When by adjusting internal circulating load and oxygen-adding amount, the CO in the flue gas of adjustment fluidized-bed combustion boiler discharge2When concentration is more than waiting 15%,
Into the production of ammonium hydrogencarbonate after remaining flue gas is carried out desulfurization process and compressed；
It is described to further comprise the production that ammonium hydrogencarbonate is carried out after remaining flue gas progress desulfurization process and compression processing：
After remaining flue gas is sent into caustic wash desulfuration tower progress desulfurization process, processing is compressed into the first flue gas compressor；
The second flue gas compressor, which is sent into, after flue gas progress dedusting and secondary desulfuration processing after compressed processing boosts to 0.7MPa, as
Unstripped gas is sent into the production that ammonium hydrogen carbonate synthesis system carries out ammonium hydrogencarbonate；
Caustic wash desulfuration tower top is provided with to carry out being distributed alkali cleaning liquid distribution trough to alkali lye；
The pressure regulating butterfly valve that the first flue gas compressor of regulation extracts exhaust gas volumn is provided with before the first flue gas compressor import, the
Bypass valve is provided between one flue gas compressor import and outlet.
2. the method for the carbon dioxide production ammonium hydrogencarbonate according to claim 1 using in boiler exhaust gas, its feature exist
In the alkali cleaning liquid distribution trough that the caustic wash desulfuration tower is set by its top is distributed to alkali lye.
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| CN201610241513.0A CN105905923B (en) | 2016-04-19 | 2016-04-19 | Using the method for the carbon dioxide production ammonium hydrogencarbonate in boiler exhaust gas |
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| CN105905923B true CN105905923B (en) | 2018-03-27 |
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| 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 |
| CN112361834B (en) * | 2020-11-09 | 2023-01-10 | 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 |
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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 |
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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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