CN105311925A - Large-scale adsorbent modification coupling jet system for controlling heavy metal pollutant emission in flue gas - Google Patents
Large-scale adsorbent modification coupling jet system for controlling heavy metal pollutant emission in flue gas Download PDFInfo
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Abstract
The invention discloses a large-scale adsorbent modification coupling jet system for controlling heavy metal pollutant emission in flue gas. The jet system mainly comprises: a material storage tank, a material feeder, a material feeding device, a modifying agent tank, a modifying main machine, a cyclone separator, a material collecting bucket, a material feeding apparatus, a gas-solid mixing accelerator, a jet tube and an air compressor and the like. The adsorbent and the agent are added to the modifying main machine according to a certain ratio so that the adsorbent and the agent are subjected to a reaction to perform chemical modification. The modified adsorbent then is fed into the gas-solid mixing accelerator under control of the material feeding apparatus to mix the adsorbent with gas according to a certain ratio. The mixture then is jetted into a flue along a transportation pipe to adsorb and remove the pollutants in flue gas. The system is suitable for removing heavy metal pollutants (Hg, As, Pb, Cd, Cr and the like) in flue gas and the acidic gas pollutants such as SO3, HCl and the like from flue gas. The jet system achieves on-site large-scale modification of the adsorbent and has continuity and closed property.
Description
Technical field
Patent of the present invention belongs to flue gas heavy metal pollutant emission control technology field, particularly a kind of extensive Adsorbent modification coupling spraying system controlling heavy metal in flue gas pollutant emission.On-the-spot coupling Geldart-D particle and the spraying system realizing the extensive modification of adsorbent such as specifically to refer in coal-burning power plant, various pollutants in fume is removed, as heavy metal (mercury, arsenic, lead, cadmium, chromium) and highly acid gas (sulfur trioxide and hydrogen chloride) etc. by absorption realization.
Background technology
Heavy metal has enriching, is difficult to degrade in the environment, and the heavy metal and the compound thereof that are discharged into the external world have harm large to health and ecological environment.For heavy metal Hg, mercury contaminants has the feature such as stable chemical nature, high volatility, and mercury contaminants has cumulative bad, so mercury pollution problem causes the attention of people gradually in air in natural environment and biologic artifact simultaneously.The mercury that the flue gases such as coal-burning power plant discharge is the main source that Mercury In The Air pollutes, and can form a large amount of gaseous mercury in coal combustion process, gaseous mercury can be discharged in air together along with flue gas.By one of coal-fired flue-gas mercury pollution control technology that the gaseous mercury in adsorbent flue gas is main flow.In this technology, it is generally the gaseous mercury that will adsorb in sorbent injection to flue in flue gas.Conventional adsorbent comprises carbon-based adsorbent active carbon and non-carbon adsorbent ash adsorbent like flying etc.Absorption comprises physical absorption and chemisorbed, and physical absorption ability is relatively weak, in order to improve the adsorption capacity of adsorbent, usually needs to carry out chemical modification to adsorbent.
Active carbon specific area is comparatively large, and adsorption capacity is comparatively strong, but expensive.A kind of industrial solid castoff that the coal dust that non-carbon adsorbent is coal-burning power plant as flying dust is discharged after burning, low price, has very large storage simultaneously.China only between 30% ~ 40%, is mainly used in the industries such as building, cement to the utilization rate of flyash.But flying dust is poor to gaseous mercury adsorptivity, so more need to carry out modification to flying dust, develop novel flying dust base adsorbent.
Chinese patent CN102120174A discloses a kind of method utilizing halogen to carry out flooding modification to flyash, in this method, adsorbent needs to flood 3 ~ 12 hours in halide salt solution, then dry 12 hours, finally need to put into vacuum drying oven and dry 24 hours.This method of modifying is applicable to laboratory scale research, is difficult to the emitted dose meeting the required adsorbents such as the larger coal-burning power plant of exhaust gas volumn.Therefore, how carrying out extensive modification in coal-burning power plant to adsorbent is current urgent problem.
Chinese patent CN201614359U discloses a kind of powder surface modifier continuously, this modifier is applicable to carry out surface modification to inorganic non-metallic mineral powder filling materials, material is in modifying process, the temperature produced by the strong friction between stator, rotor is 100 ~ 125 DEG C, the fusing point of medicament is generally lower than 100 DEG C, and in modification main frame, the mixing of material and medicament is that the mixing of solid and liquid is to reach the effect of powder surface modification.
The adsorbent that current sorbent injection demercuration technology uses is all produce with the off-line mode of production, automaticity is lower, and modified adsorbent moisture content is higher than former adsorbent, pile up overlong time and easily cause caking, more difficultly meet on-the-spot the operation continuously such as coal-burning power plant and remove the heavy metal contaminants demands such as mercury.In order to realize the control to the heavy metal contaminants such as mercury in flue gas and highly acid gas pollutant, develop extensive adsorbent situ modified coupling spraying system significant.
Summary of the invention
The present invention seeks to propose a kind of extensive Adsorbent modification coupling spraying system realizing controlling heavy metal in flue gas pollutant emission.It is characterized in that, the modification of adsorbent is carried out with spraying simultaneously, can realize extensive modification at the scene, and described system all adopts and automatically controlledly to control in real time.Through demo-plant test, described Systematical control heavy metal (mercury, arsenic, lead, cadmium, chromium) pollute and highly acid gas as strong in the pollutant such as sulfur trioxide and hydrogen chloride ability, be applicable to the control of multi-pollutant in industrial process flue gas.
The present invention realizes extensive modification coupling in the following manner and sprays:
Deposit original unmodified adsorbent in described adsorbent storage batch can 1, enter in frequency conversion feed arrangement 3 by dispenser 2 during work, improved chemical is placed in improved chemical tank 4.
Adsorbent and improved chemical add in modification main frame 5 according to a certain percentage, and unmodified adsorbent in modification main frame, high velocity impact occurs and reacts, and modified adsorbent ability improves greatly, there will not be adsorbent caking phenomenon simultaneously.
Described improved chemical tank 4 and modification main frame 5 material are that Teflon coating is sprayed in stainless steel or inside, corrosion-resistant strong with mar proof.
Described air-introduced machine 7 provides negative pressure for extensive reforming system, the effect that modified adsorbent is subject to air-introduced machine 7 enters in cyclone separator 6, air-introduced machine 7 outlet is connected with conveyance conduit, can ensure the closure of Adsorbent modification coupling spraying system like this, there is not material mass loss.
After modified adsorbent in described cyclone separator 6 enters bunker for collecting 8, controlled to enter gas-solid mixing accelerator 12 by feeder 11, the charging rate of feeder 11 and the charging rate of dispenser 2 basically identical, ensure extensive modification coupling spraying system continuity.
Described conveying elbow 13 radius of curvature is 6 ~ 12 times of caliber, and inner-walls of duct linings 3 ~ 5mm earthenware, effectively improves the service life of conveying elbow.
Described roots blower 9 is driving elements of sorbent injection system, and exhaust-valve 10 plays the effect regulating transfer pipeline Air Quantity Required.When system pressure loss is excessive, roots blower 9 can use air compressor instead.
Described injection pipe 14 feeding manner is two ends chargings simultaneously, and now pipe interior particle and pressure distribution are more even, and the adsorbent dispersion effect be ejected in flue 15 is good, prevents line clogging.In described adsorbent extensive modification coupling spraying system, all control elements are controlled by electric-control system 16, simple to operate, increase work efficiency.
Described check-valves 17 is for preventing gas in conveyance conduit and adsorbent adverse current.
Described air compressor 18 plays a part to blow stifled, and when blocking occurs injection pipe 14, system is automatically out of service, and air compressor 18 is started working, and blows stifled to injection pipe.
Beneficial effect of the invention process comprises:
1) the extensive Adsorbent modification coupling in the scene that present invention achieves is sprayed, and the modification of adsorbent is carried out with injection simultaneously, ensures the continuity being reduced pollutant technical process by adsorption method;
2) this invention ensures that the closure of system, fly to overflow without dust, it is effective that Adsorbent modification and injection are coupled, and there is not material mass loss, prevent material contaminated environment;
3) the present invention ensures through adsorbent moisture content modified on a large scale lower than 3%, meet the requirement of Geldart-D particle, there is high velocity impact in adsorbent simultaneously in modifying machine, and caking phenomenon reduces, whole conveying and course of injection not easily block, and system cloud gray model reliability is high;
4) present invention achieves automation, groundwork element is placed on ground, does not need to be transported on platform to work, and whole system control element is by electric control system controls, simple to operate.
Accompanying drawing explanation
Fig. 1 is the process chart of adsorbent of the present invention extensive modification coupling spraying system.
Wherein number in the figure:
1, storage tank; 2, dispenser; 3, frequency conversion feed arrangement; 4, improved chemical tank; 5, modification main frame; 6, cyclone separator; 7, air-introduced machine; 8, bunker for collecting; 9, roots blower; 10, exhaust-valve; 11, feeder; 12, gas-solid mixing accelerator; 13, elbow is carried; 14, injection pipe; 15, flue; 16, electric-control system; 17, check-valves; 18, air compressor.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
The present invention proposes a kind of extensive Adsorbent modification coupling spraying system, as shown in Figure 1, comprising: adsorbent storage batch can 1, revolve dispenser 2, frequency conversion feed arrangement 3, improved chemical tank 4, modification main frame 5, cyclone separator 6, air-introduced machine 7, bunker for collecting 8, roots blower 9, exhaust-valve 10, feeder 11, gas-solid mixing accelerator 12, conveying elbow 13, injection pipe 14, flue 15, electric-control system 16, check-valves 17 and air compressor 18.Described system comprises two parts: extensive reforming system and spraying system, and two systems coordinate to be run, and ensure that continuity and the closure of coupled system.
Described extensive reforming system comprises feed arrangement and modification and material-gathering device, and 1,2,3,4 form adsorbent and medicament feed arrangement before modified, and adsorbent and medicament add in modification main frame 5 according to a certain percentage, in modification main frame 5, complete modification; Be subject to the effect of air-introduced machine 7, from modification main frame 5, modified adsorbent out enters in cyclone separator 6 along connecting pipe and is separated, and wherein the bottom of cyclone separator fallen by adsorbent, and air is exported by air-introduced machine 7 and enters in conveyance conduit.
Described spraying system comprises Pneumatic conveyer and injection pipe, 9 and 10 composition inlet ducts; 8 and 11 composition sorbent feed apparatus.In gas-solid mixing accelerator 12, adsorbent and gas are according to the mixing of certain ratio, then flow to injection pipe 14 place along conveyance conduit, spray into uniformly in flue 15.
Described frequency conversion feed arrangement 3, with heater, when working under the working environment of cold, opens heater, ensures that reforming system normally runs.
Described improved chemical tank 4 material is that Teflon coating is sprayed in stainless steel or inside, and with electrically heated rod, ensures that reforming system can run under the working environment of cold.
Described modification main frame 5 material is that Teflon coating is sprayed in stainless steel or inside, wear-resistant, corrosion-resistant.
Described conveying elbow 13 linings the thick earthenware of 3 ~ 5mm at inner-walls of duct, strengthens the mar proof of conveying elbow.
When blocking occurs described injection pipe 14, system is automatically out of service, and air compressor 18 is started working, and blows stifled to injection pipe.
The present invention can summarize with other the concrete form without prejudice to spirit of the present invention and principal character.Therefore, above-mentioned embodiment of the present invention all can only be thought explanation of the present invention and can not limit the present invention, and claims indicate scope of the present invention, and above-mentioned explanation does not all point out scope of the present invention.Therefore, any change in the implication suitable with claims of the present invention and scope, all should think to be included in the scope of claims.
Claims (10)
1. one kind realizes the extensive Adsorbent modification coupling spraying system controlling heavy metal in flue gas pollutant emission, it is characterized in that, system, coupled reforming system and spraying system, modified adsorbent is delivered directly to spraying system, the scene of being formed in is carried out modification and is sprayed the technique of integration, the pollutant that spraying system will adsorb in sorbent injection to flue in flue gas, as heavy metal (mercury, arsenic, plumbous, cadmium, chromium) and highly acid gas (sulfur trioxide and hydrogen chloride) etc., system specifically forms and comprises: adsorbent storage batch can 1, dispenser 2, frequency conversion feed arrangement 3, improved chemical tank 4, modification main frame 5, cyclone separator 6, air-introduced machine 7, bunker for collecting 8, roots blower 9, exhaust-valve 10, feeder 11, gas-solid mixing accelerator 12, conveying elbow 13, injection pipe 14, flue 15, electric-control system 16, check-valves 17, air compressor 18, wherein adsorbent storage batch can 1, dispenser 2, frequency conversion feed arrangement 3, improved chemical tank 4, modification main frame 5, cyclone separator 6 and air-introduced machine 7 form reforming system, bunker for collecting 8, roots blower 9, exhaust-valve 10, feeder 11, gas-solid mixing accelerator 12, conveying elbow 13 and injection pipe 14 form spraying system.
2. Adsorbent modification coupling spraying system according to claim 1, it is characterized in that, adsorbent enters frequency conversion feed arrangement 3 from adsorbent storage batch can 1 through dispenser 2, improved chemical from frequency conversion feed arrangement 3 in adsorbent out and improved chemical tank 4 adds in modification main frame 5 according to a certain percentage, and the modification that reacts in modification main frame 5, under the effect of air-introduced machine 7, collected from modification main frame 5 modified adsorbent out by cyclone separator 6, after adsorbent in cyclone separator 6 enters bunker for collecting 8, controlled to enter gas-solid mixing accelerator 12 by feeder 11, modified adsorbent and from roots blower 9 suck air mix according to certain ratio gas-solid mixing accelerator 12, then injection pipe 14 place is flow to along conveyance conduit, by multiple injection pipe, modified adsorbent is sprayed in flue 15 uniformly.
3. Adsorbent modification coupling spraying system according to claim 1, it is characterized in that, system achieves the on-the-spot extensive continuous modification of adsorbent, by mixing and reacting in modifying process, physicochemical properties and the mechanism of adsorbent change, and improve the activity of adsorbent.
4. Adsorbent modification coupling spraying system according to claim 1, it is characterized in that, frequency conversion feed arrangement 3 is with heater, and pharmacy jar 4 material is that Teflon coating is sprayed in stainless steel or inside, and with electrically heated rod, ensure that reforming system can run under the working environment of cold.
5. Adsorbent modification coupling spraying system according to claim 1, it is characterized in that, modification main frame 5 material is that Teflon coating is sprayed in stainless steel or inside, wear-resistant, corrosion-resistant, unmodified adsorbent is inner through high-speed stirred, collision at modification main frame, there will not be the phenomenons such as caking.
6. Adsorbent modification coupling spraying system according to claim 1, it is characterized in that, when system pressure loss is excessive, roots blower 9 can use air compressor instead.
7. carry elbow 13 to lining the thick earthenware of 3 ~ 5mm at inner-walls of duct, strengthen the mar proof of conveying elbow, improve system service life.
8. Adsorbent modification coupling spraying system according to claim 1, it is characterized in that, the feeding manner of injection pipe 14 is two ends chargings simultaneously, promote pipe interior particle and pressure distribution more even, the adsorbent dispersion effect be ejected in flue 15 is good, and prevents line clogging.
9. Adsorbent modification according to claim 1 coupling spraying system, is characterized in that, described check-valves 17 is for preventing gas in conveyance conduit and adsorbent adverse current.
10. Adsorbent modification according to claim 1 coupling spraying system, is characterized in that, described air compressor 18 plays a part to blow stifled, when there is blocking in injection pipe 14, system is automatically out of service, and air compressor 18 is started working, and blows stifled to injection pipe.
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| CN201410261836.7A CN105311925B (en) | 2014-06-11 | 2014-06-11 | Control the extensive Adsorbent modification coupling spraying system of flue gas heavy metal pollutant emission |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106178834A (en) * | 2016-08-26 | 2016-12-07 | 福建龙净环保股份有限公司 | Active carbon powder injection apparatus |
| JP2018066523A (en) * | 2016-10-21 | 2018-04-26 | 日立造船株式会社 | Drug dosing device and treatment equipment of flue gas |
| CN109821350A (en) * | 2019-02-18 | 2019-05-31 | 浙江菲达环保科技股份有限公司 | A kind of Hg/SO based on intermediate injection3The electric-bag complex dust collector of cooperation-removal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106178834A (en) * | 2016-08-26 | 2016-12-07 | 福建龙净环保股份有限公司 | Active carbon powder injection apparatus |
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| CN109821350A (en) * | 2019-02-18 | 2019-05-31 | 浙江菲达环保科技股份有限公司 | A kind of Hg/SO based on intermediate injection3The electric-bag complex dust collector of cooperation-removal |
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| CN105311925B (en) | 2018-01-05 |
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