CN218530349U - Biomass boiler flue gas deep purification system - Google Patents
Biomass boiler flue gas deep purification system Download PDFInfo
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- CN218530349U CN218530349U CN202222949312.XU CN202222949312U CN218530349U CN 218530349 U CN218530349 U CN 218530349U CN 202222949312 U CN202222949312 U CN 202222949312U CN 218530349 U CN218530349 U CN 218530349U
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Abstract
The utility model relates to a biomass boiler flue gas treatment technology. The purpose provides a biomass boiler gas cleaning system, and this system can administer many pollutants such as particulate matter, NOx, SO2, VOCs in coordination, effectively gets rid of flue gas foul smell peculiar smell, realizes flue gas deep purification. The technical scheme is a biomass boiler flue gas deep purification system which is characterized in that: the system also comprises a VOCs removing module and a deodorization module which are respectively and electrically connected with the DCS controller; desulfurization module, dust removal module, denitration module, air heater's first loop, removal of VOCs module, deodorization module, draught fan and chimney communicate according to the preface through connecting the flue to handle the boiler flue gas of economizer output.
Description
Technical Field
The utility model relates to a biomass boiler flue gas treatment technology specifically is biomass boiler flue gas deep purification system.
Background
In the use process of the biomass boiler, the discharged flue gas has complex components and contains particulate matters and sulfur dioxide (SO) 2 ) Nitrogen Oxide (NO) x ) And various pollutants such as Volatile Organic Compounds (VOCs) and the like, and the emission characteristics of the pollutants are mainly embodied as follows: (1) The biomass combustion flue gas contains a large amount of VOCs which are not completely or timely combusted,according to related reports, the biomass combustion flue gas contains 56 VOCs, and the concentration range of the VOCs is about 872-6929 ug/m 3 (ii) a (2) The biomass fuel needs to be doped with wood, bark and the like, which can cause NO x 、SO 2 The concentration fluctuation range is large. Straw as a fuel, NO x 、SO 2 The concentration is 100-250 mg/m 3 In the case of fuel doping, NO x 、SO 2 The concentration is 200-600 mg/m 3 (ii) a (3) Particulate matter produced by biomass boiler combustion is mainly derived from incomplete combustion of fuel and secondary synthesis of combustion products. Research shows that the particles contain a large amount of alkali metal oxides, so that the particles not only pollute the atmospheric environment, but also are harmful to human health; (4) The smoke smell threshold value of the biomass boiler is low, so that the biomass boiler is unpleasant and influences the surrounding environment and the production and life of people.
CN112007465 provides a flue gas desulfurization, denitrification and dust removal purification device of a biomass boiler, which comprises a straight flue, a primary heat exchanger, a transverse flue, a dust removal mechanism, a dehydrator and a desulfurization tower which are connected in sequence; the top of the transverse flue is provided with a nozzle assembly which sprays a denitrification reagent to remove smoke nitrogen oxides; the dust removal mechanism comprises a dust removal cylinder, and two refrigeration dust removal pipes which are symmetrically distributed are arranged on the inner wall of the dust removal cylinder. Although the device can meet the ultra-low emission requirement; but fails to effectively control VOCs and odor and peculiar smell.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that overcome above-mentioned background art not enough, provide a biomass boiler gas cleaning system, particulate matter, NO can be administered in coordination to this system x 、SO 2 And VOCs and other pollutants, effectively removes the odor and peculiar smell of the smoke, and realizes the deep purification of the smoke.
The utility model provides a technical scheme is:
the utility model provides a biomass boiler flue gas deep purification system, includes desulfurization module, dust removal module, denitration module, draught fan and the chimney of electric connection DCS controller respectively, its characterized in that: the system also comprises a VOCs removing module and a deodorization module which are respectively and electrically connected with the DCS controller; desulfurization module, dust removal module, denitration module, air heater's first loop, remove VOCs module, deodorization module, draught fan and chimney communicate according to the preface through connecting the flue to handle the boiler flue gas of economizer output.
Preferably, the deodorization module adopts a photocatalytic oxidation reactor.
Preferably, the VOCs removing module is a two-stage activated carbon adsorber.
Preferably, the air preheater employs a heat exchanger.
Preferably, the agent adopted by the desulfurization module is baking soda.
Preferably, the dust removal module adopts a high-temperature pulse bag-type dust remover.
Preferably, the catalyst adopted by the denitration module is a medium-low temperature SCR denitration catalyst, and the denitration reducing agent is ammonia gas prepared by an ammonia water evaporator.
The air feeder is also sequentially communicated with a second loop of the air preheater and the biomass boiler through an air pipe, and flue gas discharged by the biomass boiler is output to the desulfurization module through a flue gas outlet of the economizer.
The utility model has the advantages that:
the system and the traditional biomass boiler flue gas treatment process can be used for cooperatively treating particulate matters and SO in the flue gas 2 、NO x And various pollutants such as VOCs not only meet the ultralow emission requirement, but also can solve the problems of removing VOCs, odor and peculiar smell and the like, and the flue gas is deeply purified. Meanwhile, the whole system can continuously and stably operate, and the operation is simple.
Drawings
Fig. 1 is a diagram of a system connection relationship according to an embodiment of the present invention.
In the figure: 1. a desulfurization module; 2. a dust removal module; 3. a denitration module; 4. a VOCs removal module; 5. a deodorization module; 6. an induced draft fan; 7. a chimney; 8. a biomass boiler; 9. a coal economizer; 10. an air preheater; 11. an air blower.
Detailed Description
The present invention will be further described with reference to specific embodiments, but the scope of the present invention is not limited thereto.
A biomass boiler flue gas deep purification system comprises a desulfurization module 1, a dust removal module 2, a denitration module 3, a first loop of an air preheater 10, an induced draft fan 6 and a chimney 7 which are communicated with a flue gas outlet of an economizer 9 in sequence; the blower 11 also preheats fresh air through a second loop of the air preheater 10, then the fresh air is input into the biomass boiler 8 through an air pipe, and flue gas discharged by the biomass boiler is discharged through a flue gas outlet of an economizer in a flue of the boiler. The desulfurization module, the dust removal module, the denitration module, the draught fan and the air feeder are all electrically connected with the DCS controller and are controlled by the DCS controller in a unified mode.
The above is similar to the conventional boiler flue gas purification system.
The utility model discloses an improvement is installation deodorization VOCs module 4 and deodorization module 5 between air heater 10 and draught fan 6 for the first loop of air heater, VOCs module, deodorization module and draught fan 6 communicate in proper order, and the DCS controller is also connected respectively to deodorization VOCs module and deodorization module electricity.
Preferably, the VOCs removing module is a two-stage activated carbon adsorber (two activated carbon adsorbers connected in series), and the activated carbon adsorber adopts a vertical fixed bed reactor. Based on the excellent adsorption performance and good adsorption capacity of the activated carbon, the primary activated carbon adsorber is pretreated, so that the discharge amount of VOCs (volatile organic compounds) can be weakened, the service life of secondary activated carbon can be prolonged, and the secondary activated carbon adsorber can be used as a simple filter layer to intercept residual particulate matters and water vapor in smoke; the second-stage activated carbon adsorber can be used for adsorbing VOCs and residual SO in flue gas 2 、NO x And the pollutants such as VOCs and the like can be effectively removed by carrying out undifferentiated adsorption.
Preferably, the deodorization module adopts a photocatalytic oxidation reactor. Anatase type TiO with ultraviolet lamp as light source 2 As catalyst, irradiating TiO with ultraviolet light 2 Generating hydroxyl radical (. OH) and active oxygen species (. O) 2 - 、H 2 O.), to purify the pollutant in the smoke, thereby achieving the purpose of deodorization.
Preferably, the agent adopted by the desulfurization module is baking soda. The flue gas is led out from the outlet of the coal economizer and enters the SDS desulfurization reaction section of the desulfurization module. Sodium bicarbonate superfine powder is sprayed into the flue, the sodium bicarbonate superfine powder is decomposed into high-activity sodium carbonate and carbon dioxide under the action of high-temperature flue gas, na2CO3 with strong activity is fully contacted with SO2 and other acidic media in the flue gas to generate chemical reaction, and the flue gas is absorbed and purified. And the desulfurized powdery particle product enters a bag-type dust collector along with the airflow for further dust removal, and then enters a denitration air preheater, an induced draft fan and a chimney and is discharged into the atmosphere.
Preferably, the dust removal module adopts a high-temperature pulse bag-type dust remover; the material of the filter bag is 100 percent PTFE + PTFE film, the gram weight is more than 750, the tolerance temperature is not lower than 240 ℃, the service life is more than 3 years, and the filter area of the filter bag meets the requirement of ultra-low emission. Because the specific weight of the biomass combustion ash is small, the bag-type dust remover is designed into bins, the partition plates are arranged among the bins, the secondary adhesion of the raised dust is reduced by adopting an off-line dust removal mode, the differential pressure transmitter is arranged at the inlet and the outlet of the dust remover, the reasonable differential pressure value is set to control the dust removal frequency, and the dust removal frequency is controlled by the PLC system.
Preferably, the catalyst adopted by the denitration module is a medium-low temperature SCR denitration catalyst, and the ammonia water evaporator is adopted to prepare the denitration reducing agent. The ammonia water is vaporized into mixed gas of NH3 and H2O by electric heating, the mixed gas and hot flue gas from a dilution fan are mixed by an ammonia-air mixer, the volume concentration of ammonia gas is diluted to be below 5%, the ammonia gas enters an SCR denitration system through an AIG ammonia injection grid, and ammonia and nitric oxide are subjected to reduction reaction on the surface of a catalyst to remove the nitric oxide.
Preferably, the air preheater adopts a heat exchanger. The temperature of the discharged smoke is reduced by recycling part of heat of the smoke. The recovered waste heat is utilized to heat air, so that the ignition and combustion processes of fuel are strengthened, the incomplete combustion loss is reduced, and the boiler efficiency is further improved.
Examples
The smoke generated by the combustion of a certain biomass boiler is relatively complex in smoke components and large in emission concentration fluctuation due to fuel doping. The flue gas discharged by the boiler is desulfurized by a desulfurization module 1 module through an SDS dry method, and is mainly provided with a sodium bicarbonate storage bin, a grinding mill, a conveying fan, an ejector and a desulfurization reaction section. Outsourcing sodium bicarbonatePulverizing, putting ton bag sodium bicarbonate into storage bin via electric hoist, feeding into mill with screw feeder, preparing sodium bicarbonate fine powder smaller than 20 μm by mill, conveying to sodium bicarbonate injector by conveying fan, spraying into flue and SO 2 And carrying out contact reaction, and ensuring the reaction time to be more than 2 s.
Then enters a dust removal module 2, the module adopts a pulse bag dust collector, the offline filtering wind speed is less than 0.8m/min, the material of a filter bag is 100 percent of PTFE + PTFE film, the gram weight is more than 750 percent, and the temperature is endured to be not lower than 240 ℃. The dust remover is provided with a plurality of chambers, the ash conveying adopts concentrated phase pneumatic ash conveying, and the ash conveying frequency is controlled in an interlocking way according to an ash hopper level meter.
Then the ammonia gas enters a denitration module 3, the module adopts medium-low temperature SCR denitration, one boiler is provided with an SCR reactor, a reducing agent adopts 20% ammonia water, purchased ammonia water is pumped into an ammonia water storage tank from a tank car through an ammonia water unloading pump and is conveyed to an ammonia water evaporator through an ammonia water conveying pump, and the produced ammonia gas is used for SCR denitration. The medium-low temperature SCR denitration catalyst is purchased outside, a honeycomb catalyst is selected, the number of the pores is preferably between 20 and 30, and the service life is not less than 24000 hours.
After the desulfurization, denitrification and dust removal, the clean flue gas still contains VOCs with higher concentration and the water content is more than 30 percent. The flue gas gets into except that VOCs module 4 after air heater cooling, and the module all adopts vertical fixed bed reactor for the configuration of second grade active carbon adsorber, and the primary active carbon main function is for removing dust, dehumidification and filtration impurity, extension second grade active carbon life, and the pollutant in the second grade active carbon can indifference absorption flue gas.
Finally, the wastewater enters a deodorization module 5 which is a photocatalytic oxidation reactor, and the anatase TiO is irradiated by ultraviolet light generated by an ultraviolet lamp 2 Catalyst for generating hydroxyl radical (. OH), active oxygen species (. O) 2 - 、H 2 O), and the like, and the strong oxidizing substances are used for purifying the odor and peculiar smell of the smoke so as to achieve the aim of deodorization. And the outlet of the photocatalytic oxidation reactor is connected with an induced draft fan and discharged from a chimney.
The system is changed according to active carbon and anatase type TiO 2 Catalyst and normal service time of denitration catalystAnd designing, wherein the replacement and recovery of the system need to entrust a dangerous waste and qualification factory for recovery.
Claims (8)
1. The utility model provides a biomass boiler flue gas deep purification system, includes desulfurization module (1), dust removal module (2), denitration module (3), draught fan (6) and chimney (7) of electricity connection DCS controller respectively, its characterized in that: the system also comprises a VOCs removal module (4) and a deodorization module (5) which are respectively and electrically connected with the DCS controller; desulfurization module, dust removal module, denitration module, air heater's first loop, removal of VOCs module, deodorization module, draught fan and chimney communicate according to the preface through connecting the flue to handle the boiler flue gas of economizer output.
2. The biomass boiler flue gas deep purification system of claim 1, characterized in that: the deodorization module adopts a photocatalytic oxidation reactor.
3. The deep purification system for the flue gas of the biomass boiler according to claim 2, characterized in that: and the VOCs removing module adopts a secondary activated carbon adsorber.
4. The biomass boiler flue gas deep purification system of claim 3, characterized in that: the air preheater adopts a heat exchanger.
5. The deep purification system for the flue gas of the biomass boiler as recited in claim 4, wherein: the agent adopted by the desulfurization module is baking soda.
6. The deep purification system for the flue gas of the biomass boiler according to claim 5, characterized in that: the dust removal module adopts a high-temperature pulse bag dust remover.
7. The deep purification system for the flue gas of the biomass boiler according to claim 6, characterized in that: the catalyst adopted by the denitration module is a medium-low temperature SCR denitration catalyst, and the denitration reducing agent is ammonia prepared by an ammonia water evaporator.
8. The deep purification system for the flue gas of the biomass boiler according to claim 7, characterized in that: the air feeder (11) is also sequentially communicated with a second loop of the air preheater and the biomass boiler through air pipes, and flue gas discharged by the biomass boiler is output to the desulfurization module through a flue gas outlet of the economizer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222949312.XU CN218530349U (en) | 2022-11-02 | 2022-11-02 | Biomass boiler flue gas deep purification system |
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| CN202222949312.XU CN218530349U (en) | 2022-11-02 | 2022-11-02 | Biomass boiler flue gas deep purification system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117000040A (en) * | 2023-09-25 | 2023-11-07 | 北京利德衡环保工程有限公司 | Flue gas desulfurization, denitrification, dust removal and separation system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117000040A (en) * | 2023-09-25 | 2023-11-07 | 北京利德衡环保工程有限公司 | Flue gas desulfurization, denitrification, dust removal and separation system |
| CN117000040B (en) * | 2023-09-25 | 2024-01-16 | 北京利德衡环保工程有限公司 | Flue gas desulfurization, denitrification, dust removal and separation system |
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