CN112915695A - High-temperature high-humidity flue gas desulfurization, dust removal and denitration flue gas purification process - Google Patents
High-temperature high-humidity flue gas desulfurization, dust removal and denitration flue gas purification process Download PDFInfo
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- CN112915695A CN112915695A CN201911232137.9A CN201911232137A CN112915695A CN 112915695 A CN112915695 A CN 112915695A CN 201911232137 A CN201911232137 A CN 201911232137A CN 112915695 A CN112915695 A CN 112915695A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/508—Sulfur oxides by treating the gases with solids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/606—Carbonates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
The invention relates to a high-temperature high-humidity flue gas purification treatment process and system based on a multi-tube cyclone dust collector, SDA (SDA desulfurization) and bag-type dust collector, which are suitable for the influence of unburned sparks in flue gas of a biomass boiler, large moisture content and large pollutant fluctuation on the operation of environment-friendly equipment. A high-temperature and high-humidity flue gas purification treatment process based on SDA desulfurization, high-temperature cloth bag dust removal and low-temperature SCR denitration comprises the following steps that firstly, high-temperature (200-230 ℃) flue gas is led out from the front of a flue air preheater at the tail of a boiler; secondly, the dust-containing flue gas is subjected to primary dust removal, and unburned sparks and large particles are removed by a ceramic multi-tube cyclone dust collectorDust, the temperature of the pretreated gas is kept above 200 ℃; thirdly, the flue gas after primary dust removal enters a desulfurization temperature regulating tower according to the temperature of the flue gas at an inlet and an outlet and SO2Adjusting the concentration; fourthly, treating the flue gas after SDA desulfurization by adopting a low-pressure pulse blowing bag type dust collector; fifthly, enabling the flue gas to enter a low-temperature SCR denitration system, and generating harmless nitrogen and water vapor by using nitrogen oxides under the action of a low-temperature catalyst; sixthly, returning the purified flue gas to an original flue of the boiler, recovering waste heat of an original air preheater, and sending the flue gas into a chimney through an induced draft fan to be discharged to the atmosphere; seventhly, the ash separated and intercepted by the cyclone dust collector and the bag type dust collector is respectively arranged in an ash storehouse for storage.
Description
Technical Field
The invention relates to a desulfurization, denitrification and dedusting process and system for flue gas under high-temperature and high-humidity working conditions, in particular to a biomass power plant flue gas purification treatment process and system based on high-temperature (above 200 ℃) desulfurization and dedusting.
Background
Taking a biomass boiler as an example, the high-temperature and high-humidity flue gas has the following characteristics:
1. the biomass fuel has high hydrogen element content and high moisture content in the flue gas, which can reach 15-30%. The acid dew point temperature of the flue gas is high, which is 10K higher than that of a coal-fired boiler, and the problems of condensation and bag pasting are easy to occur when the temperature of the flue gas is reduced.
2. The content of alkali metal in the smoke dust is high and can reach 8 percent, and the SCR denitration catalyst is easy to lose effectiveness.
3. The contents of sulfur dioxide and nitrogen oxide are 100-250mg/m when pure biomass is combusted3For example, blending burning of templates, wood, bark, industrial waste, etc., SO2And the fluctuation range of NOx pollutants is large.
4. Unburned sparks are often entrained in the flue gas, which affects the rear equipment. The high-temperature and high-humidity flue gas is commonly subjected to desulfurization technologies such as in-furnace calcium spraying, out-furnace circulating fluidized bed calcium spraying (CFB semi-dry desulfurization), spraying wet method and the like, various schemes can meet the emission index requirements, but the control of the total investment cost in the operation period is a key. The flue gas has large moisture content, and the flue gas is close to an acid dew point after the semi-dry desulfurization process is adopted, so that bag pasting of a cloth bag and dew formation corrosion inside a dust collector are easily caused, and the desulfurization efficiency and normal operation of a system are influenced. The SNCR process is mostly adopted for denitration of high-humidity dusty flue gas, the temperature of a hearth is greatly fluctuated by fuel, the denitration efficiency is difficult to ensure, and the rear flue is blocked due to the over-standard escape of ammonia.
Disclosure of Invention
The invention aims to provide a high-temperature high-humidity multi-dust low-sulfur flue gas purification treatment process and a high-temperature high-humidity multi-dust low-sulfur flue gas purification treatment system, the flue gas purification process changes the original idea that a flue gas purification system is arranged at a low-temperature section (120-.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
firstly, pre-dedusting the medium-temperature and high-temperature flue gas by adopting a multi-tube mechanical deduster;
secondly, a water spraying temperature adjusting system is arranged in front of the bag-type dust collector, and a two-fluid atomizing spray gun is adopted, so that the smoke temperature is quickly and accurately controlled;
thirdly, desulfurization and dust removal are carried out firstly, and then denitration is carried out, a novel SCR low-temperature catalyst is adopted, the reaction temperature is lower, the flue gas does not need to be heated again, and the good oxidation and removal effects on dioxin and heavy metals are achieved;
fourthly, the material of the bag-type dust collector is a high silica material, so that the bag-type dust collector is suitable for a high-temperature smoke environment;
fifthly, the purified flue gas returns to the original boiler flue gas heat exchange system, so that the probability of rear equipment blockage is reduced;
sixthly, smoke diversion and uniformly distributed gratings are arranged in the SDA desulfurization tower.
Compared with the prior art, the invention has the beneficial effects that: 1. The invention leads the flue gas out of the middle temperature section of the boiler system to be purified, creates a new flue gas purification idea, enables the low-temperature SCR denitration to have the application condition in the working condition of the biomass fuel by integrating different processes such as cyclone dust removal, a temperature adjusting device, SDS desulfurization, a high-temperature bag-type dust remover and the like, and has the characteristics of simple system, mature technology, flexible arrangement, reliable application, simple and convenient maintenance and the like. The method has popularization value for the newly built or technically improved flue gas purification system engineering of the biomass power plant.
2. The temperature of the whole process route is reduced (about 10 ℃), the problems of dewing, corrosion and hardening of equipment caused by large temperature reduction of high-humidity flue gas are avoided, and the running stability of the equipment is increased.
3. The desulfurization and denitrification system is more flexible and can adapt to SO caused by fuel change of the biomass boiler2And when the concentration of NOx fluctuates greatly, the requirements of stricter environmental protection indexes are met by adjusting the input amount of the desulfurizer and the denitrifier.
4. The desulfurization and dust removal are carried out firstly, and then the denitration is carried out, so that the conditions of blockage, pollution, poisoning and the like of the low-temperature catalyst by ammonium bisulfate, alkali metal and the like are greatly reduced, and the service life of the catalyst is effectively prolonged.
5. According to the invention, the filter material of the bag type dust collector adopts a high-silica high-temperature-resistant filter material, long-term operation at 260 ℃ can be met, and the reliability is higher.
6. The two-stage dust removal and interception of the soot are respectively treated, so that solid waste is reduced.
7. The flue gas purification treatment system integrates SDA dry desulfurization, low-temperature SCR and high-temperature cloth bag dust removal technologies, conforms to the condition of low sulfur content in flue gas, adopts main equipment such as a cyclone dust collector, a desulfurization device, a bag type dust collector, an SCR system and the like, and has the characteristics of simple arrangement, reliable application, coordinated system, low investment and the like.
Drawings
FIG. 1 is a schematic view of the high-temperature and high-humidity flue gas purification treatment process flow of SDA dry desulfurization and low-temperature SCR denitration according to the present invention;
FIG. 2 is a schematic view of a high-temperature high-humidity flue gas purification treatment system for SDA dry desulfurization and low-temperature SCR denitration.
In the figure: 1 cyclone, 2SDA desulphurization unit that adjusts the temperature, 3 high temperature bag collector, 4 low temperature SCR systems, 5 draught fans, 6 chimneys.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1 and 2, a flue gas purification treatment system for SDA dry desulfurization and low-temperature SCR denitration comprises a cyclone dust collector 1, a desulfurization device 2, a bag type dust collector 3, an SCR system 4, an induced draft fan 5, and a chimney 6; the air inlet of the cyclone dust collector 1 is connected with low-sulfur high-nitrogen multi-dust flue gas from a boiler, the air outlet of the cyclone dust collector 1 is connected with the air inlet of the desulfurizing device 2 through a pipeline, and the air outlet of the desulfurizing device 2 is connected with the air inlet of the bag type dust collector 3 through a pipeline. And the desulfurization device 2 is an atomizing spray gun or a rotary atomizer and is used for carrying out dry desulfurization and purification treatment on the flue gas.
The gas filtered by the filter bag of the bag type dust collector 3 is sent to an SCR system 4 for denitration reaction, the gas temperature is about 180-220 ℃ at the moment, harmless nitrogen and water vapor are generated, the output of the SCR system 4 is connected to an original boiler heat exchanger 5 through a pipeline, after waste heat utilization, the gas is sent to a chimney 6 through an induced draft fan 5 and is discharged to the atmosphere.
The high temperature and high humidity flue gas desulfurization, dedusting and denitration flue gas purification process comprises the following steps: firstly, carrying out primary dust removal on high-temperature high-humidity dust-containing flue gas, adopting a cyclone dust collector 1 for pretreatment, and reducing the temperature of the gas pretreated by the cyclone dust collector by about 10K;
secondly, the flue gas after primary dust removal enters a temperature-adjusting and desulfurizing device 2 and is subjected to flue gas temperature adjustment and SDA dry desulfurization and purification treatment; the desulfurization device adopts spray gun atomization or is provided with a rotary spray desulfurization tower for desulfurization reaction treatment.
The desulfurizer is sodium carbonate (Na)2CO3) The desulfurization reaction equations of the powders are respectively as follows:
the sodium carbonate powder is dissolved after being added with water in a certain proportion to generate sodium carbonate slurry, the raw flue gas is sent into a rotary Spray Drying (SDA) desulfurizing tower, the tower is contacted with the atomized sodium carbonate slurry to generate physical and chemical reactions, and SO2 and other acidic media in the flue gas are absorbed and purified.
The main chemical reactions completed are:
SO2absorption by the droplets: SO (SO)2+ Na2CO3+ 1/2O2→Na2SO4﹢CO2
Thirdly, the flue gas from the desulfurization device 2 enters a bag type dust collector 3 for treatment;
fourthly, the gas filtered by the filter bag of the bag type dust collector 3 is sent to an SCR system 4 for denitration reaction, the temperature of the flue gas in the SCR system 4 is 180-240 ℃, and the catalyst of the SCR system 4 adopts heavy metal oxide catalyst of titanium oxide (TiO 2) and vanadium pentoxide (V2O 5); and (3) generating harmless nitrogen and water vapor through the denitration reaction, sending the gas into a chimney 6 through an induced draft fan 5, and discharging the gas to the atmosphere, wherein the temperature of the flue gas reaches 90-100 ℃.
The high-temperature high-humidity flue gas SDA dry desulfurization and low-temperature SCR denitration purification treatment system is arranged in a flue gas middle temperature section of a tail flue of a boiler, and is combined with equipment taking a cyclone dust collector, a temperature-adjusting desulfurization device, a bag type dust collector, a low-temperature SCR system and the like as main bodies, so that harmful substances such as solid particles, oxysulfide, nitric oxide, heavy metals (Hg, Pb, Cr) and the like in flue gas can be removed, and the flue gas emission requirements specified by national standards are met.
The invention relates to a main component of a high-temperature high-humidity dusty flue gas desulfurization, denitrification, dedusting and purification treatment system, which comprises: cyclone 1, the desulphurization unit that adjusts the temperature 2, high temperature bag collector 3, low temperature SCR deNOx systems 4, its structure and theory of operation describe as follows: (1) cyclone dust collector 1: the primary dedusting pretreatment device for the dust-containing flue gas of the system can remove most of smoke dust so as to remove unburned mars and plant ash and prolong the service life of the SCR catalyst. The working principle of the cyclone dust collector 1 is as follows: the dust-containing flue gas from the boiler is introduced into the cyclone dust collector along the tangential direction, and an outer rotational flow rotating downwards is formed in the space between the inner wall and the exhaust pipe. The smoke dust suspended in the outer rotational flow is thrown to the inner wall under the action of centrifugal force, gradually moves downwards to the lower part of the device along with the outer rotational flow and falls into an ash bucket; the purified flue gas forms an ascending inner rotational flow and enters the temperature-adjusting desulfurization device 2 through the exhaust pipe. The cyclone dust collector has simple and compact structure, and the dust collection efficiency is higher than that of the common cyclone dust collector; no moving part is arranged in the dust remover, so that the dust remover is convenient to maintain; high temperature and high pressure resistance, and no special requirement on the physical properties of dust-containing flue gas.
Temperature-adjusting desulfurization device 2: is arranged between the cyclone dust collector 1 and the bag-type dust collector 3, and adopts a spray gun to atomize and spray or is provided with a rotary spray tower 22 to carry out primary desulfurization reaction treatment.
The invention uses sodium carbonate (Na)2CO 3) powder is the preferred desulfurizing agent. The desulfurization reaction equations are respectively as follows:
SO2+ Na2CO3+ 1/2O2→Na2SO4﹢CO2
and determining to adopt a spray gun atomization method or set a rotary atomization device through the concentration of sulfur dioxide at the outlet of the boiler.
The working principle is as follows: mean diameter of atomization 60μm/dThe fine sodium carbonate slurry drops are contacted with the flue gas, and the acidic component (SO) of the flue gas is generated in the gas-liquid contact process2Etc.) are quickly absorbed by the alkaline droplets, while the water is quickly evaporated. By passingControlling gas distribution, slurry flow rate, droplet diameter and the like to ensure that the droplets are dried before the droplets of the absorption reaction reach the wall of the spray drying absorption chamber, so that powdery desulfurization products are finally formed.
Bag collector 3: the flue gas flowing through the desulfurizing device enters from the lower part of the bag type dust collector 3, flows from bottom to top, is filtered and purified by the filter bag, and the smoke dust is attached to the outer surface of the filter bag.
Based on the specific application occasion of the high-temperature and high-humidity flue gas and the flue gas temperature range set by implementing the process, the cloth bag is made of polytetrafluoroethylene glass fiber. The dust removal treatment can be carried out under the conditions that the continuous use temperature is 260 ℃ and the instantaneous temperature resistance is 280 ℃, and the running resistance is small.
The SCR system 4: the SCR system mainly comprises a reducing agent (liquid ammonia, ammonia water or urea) storage and supply, an ammonia/air spraying system, an air flow adjusting device, an air flow mixing device, an SCR reactor, an SCR control system, SCR soot blowing, conveying and the like.
The desulfurization degree, the dedusting degree and the flue gas temperature are very important to the use effect and the service life of the flue gas desulfurization and dedusting device. According to the invention, most of sulfur dioxide and dust are removed from the flue gas after desulfurization and dust removal, and when the flue gas is introduced into an SCR reactor for low-temperature denitration treatment, the blockage, poisoning and corrosion conditions of the catalyst are obviously improved, the service life is prolonged, the operation cost is effectively reduced, and the denitration efficiency can reach more than 90%.
Claims (9)
1. The high-temperature high-humidity flue gas desulfurization, dust removal and denitration flue gas purification process is characterized in that:
firstly, taking smoke gas from the front of a boiler tail flue air preheater, wherein the smoke temperature is 200-240 ℃;
secondly, the dust-containing flue gas is pretreated by a ceramic multi-tube cyclone dust collector to remove unburned sparks and large particle dust, and the temperature of the flue gas is about 200 ℃; thirdly, the flue gas after primary dust removal enters a temperature-adjusting desulfurizing tower and is sprayed with Na through a special spray gun2CO3The temperature of the slurry is adjusted to desulfurize, the temperature of the flue gas is adjusted to be less than or equal to 240 ℃, and the normal operation of rear equipment is ensured;
fourthly, the flue gas after temperature adjustment and desulfurization enters low-pressure pulse rotary blowingThe outlet dust concentration of the bag-type dust collector is lower than 5mg/Nm3；
Fifthly, the gas filtered by the bag type dust collector is sent to a low-temperature SCR denitration system, the temperature of the flue gas can adapt to 180 DEG and 260 ℃, and harmless nitrogen and water vapor are generated;
sixthly, the purified flue gas returns to the original boiler flue gas system, after waste heat of the original boiler air preheater heat exchanger is recovered, the flue gas is sent to a chimney through a draught fan, and the temperature of the flue gas can be reduced to 100 ℃;
and seventhly, the cyclone dust collector and the bag type dust collector are respectively provided with an external ash discharging and storing system, the cyclone dust collector intercepts ash for takeaway, and the desulfurized ash is separately treated.
2. The high-temperature high-humidity flue gas desulfurization, dust removal and denitration flue gas purification process as claimed in claim 1, which is characterized in that: and a desulfurization, denitrification and dust removal integrated device is arranged at the high-temperature section of the boiler flue gas system, and the purified flue gas returns to the tail flue of the original boiler.
3. The high-temperature high-humidity flue gas desulfurization, dust removal and denitration flue gas purification process as claimed in claim 1, which is characterized in that: and a ceramic multi-tube cyclone dust collector is selected, so that the dust removal efficiency is improved.
4. The high-temperature high-humidity flue gas desulfurization, dust removal and denitration flue gas purification process as claimed in claim 1, which is characterized in that: a spray temperature adjusting device is arranged in a flue between the cyclone dust collector and the SDS desulfurization device, and the temperature is accurately adjusted through an atomizing spray gun.
5. The high-temperature high-humidity flue gas desulfurization, dust removal and denitration flue gas purification process as claimed in claim 1, which is characterized in that: the desulfurizing device is specially designed with a desulfurizing tower uniform distribution device to meet the requirement of high SO2The desulfurization efficiency of the concentration flue gas is required.
6. The high-temperature high-humidity flue gas desulfurization, dust removal and denitration flue gas purification process as claimed in claim 1, which is characterized in that: the bag-type dust collector adopts a low-pressure pulse rotary dust cleaning mode, and is suitable for dust characteristics.
7. The high-temperature high-humidity flue gas desulfurization, dust removal and denitration flue gas purification process as claimed in claim 1, which is characterized in that: the bag-type dust collector adopts a low-pressure pulse rotary dust cleaning mode, and is suitable for dust characteristics.
8. The high-temperature high-humidity flue gas desulfurization, dust removal and denitration flue gas purification process as claimed in claim 1, which is characterized in that: the smoke temperature in the low-temperature SCR system is as low as 180 ℃, and the low-temperature SCR system is suitable for the range of smoke temperatures under different working conditions.
9. The high-temperature high-humidity flue gas desulfurization, dust removal and denitration flue gas purification process as claimed in claim 1, which is characterized in that: the acid dew point of the purified flue gas is reduced, the purified flue gas returns to the original boiler flue and is discharged at 100 ℃, and the condensation and blockage probability of the rear heat exchange equipment is reduced.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113719838A (en) * | 2021-08-28 | 2021-11-30 | 江苏仙盛环保科技有限公司 | Smoke purification furnace and operation method thereof |
| CN114887409A (en) * | 2022-04-26 | 2022-08-12 | 成都易态科技有限公司 | Method for efficiently combining waste heat utilization, dust removal and denitration of high-temperature flue gas |
| CN115055039A (en) * | 2022-06-16 | 2022-09-16 | 中冶东方工程技术有限公司 | Industrial silicon electric furnace flue gas purification system and method |
| CN115301014A (en) * | 2022-06-30 | 2022-11-08 | 成都易态科技有限公司 | Cement raw meal grinds high temperature flue gas purification device and cement production system |
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| CN106861350A (en) * | 2017-04-21 | 2017-06-20 | 上海市机电设计研究院有限公司 | The biomass electric power plant gas cleaning handling process and system of dry desulfurization and low-temperature denitration |
| CN108636092A (en) * | 2018-05-24 | 2018-10-12 | 南京石博环保科技有限公司 | A kind of flue gas desulfurization and denitrification system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20020150516A1 (en) * | 2000-08-01 | 2002-10-17 | Enviroscrub Technologies Corporation | System and process for removal of pollutants from a gas stream |
| CN106861350A (en) * | 2017-04-21 | 2017-06-20 | 上海市机电设计研究院有限公司 | The biomass electric power plant gas cleaning handling process and system of dry desulfurization and low-temperature denitration |
| CN108636092A (en) * | 2018-05-24 | 2018-10-12 | 南京石博环保科技有限公司 | A kind of flue gas desulfurization and denitrification system and method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113719838A (en) * | 2021-08-28 | 2021-11-30 | 江苏仙盛环保科技有限公司 | Smoke purification furnace and operation method thereof |
| CN114887409A (en) * | 2022-04-26 | 2022-08-12 | 成都易态科技有限公司 | Method for efficiently combining waste heat utilization, dust removal and denitration of high-temperature flue gas |
| CN115055039A (en) * | 2022-06-16 | 2022-09-16 | 中冶东方工程技术有限公司 | Industrial silicon electric furnace flue gas purification system and method |
| CN115301014A (en) * | 2022-06-30 | 2022-11-08 | 成都易态科技有限公司 | Cement raw meal grinds high temperature flue gas purification device and cement production system |
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Application publication date: 20210608 |