CN205412681U - Tail gas desulfurization , denitration, dust removal integration treatment device - Google Patents

Abstract

The utility model relates to a tail gas desulfurization, denitration, dust removal integration treatment device, including tail gas mixing arrangement, integration catalyst pottery strain that the wound packages is put, booster fan and energy recuperation system, integration catalyst pottery is strained and is set up flue gas mixing arrangement before the wound packages is put, integration catalyst pottery is strained the wound packages and is put and set up blowback ash removal device, be equipped with desulfurizer and denitration agent in the tail gas mixing arrangement and spout into the device, enter the chimney after the booster fan is strained the export that the wound packages put and is sent into the energy recuperation system through pipe connection integration catalyst pottery. The utility model discloses the system is reliable and stable, maintenance work volume is little, product long service life, the device operation cost is low and device area is little, thereby flow in exhaust -heat boiler's flue gas and make the heat exchange efficiency and the life of energy recuperation device promote for clean flue gas by a wide margin, brought huge economic benefits.

Description

A kind of tail gas desulfurization, denitration, dust removal integrated processing means

Technical field

This utility model relates to fume treatment field, specially desulphurization and denitration, dust removal integrated plant, especially glass, cement tails dedusting, denitration, desulfurization integrated process.

Background technology

Along with China's economy and the raising day by day of living standard, it will environment to be given increasing concern.Environmental problem deteriorates increasingly at present, and within nearly 2 years, haze shrouds in East China Liu Sheng mono-city of China, and has greatly the trend of diffusion, and the PM2.5 monitoring system of various places is also the most quick-fried table, and it has caused the concern widely of society at present, challenges the Sensitive nerve of compatriots.Country is also regulation in the policy in succession having put into effect some row, national environmental protection portion " fossil-fuel power plant atmospheric pollutant emission standard " (GB13223-2011) to this, and after 2004, newly constructed boiler discharged nitrous oxides standard performs 100mg/Nm³Regulation, sulfur dioxide be less than 50mg/Nm3, dust be less than 30mg/Nm3.In premier's Li Keqiang Government Report of 2014, beautiful China, the chapters and sections of the China that promotes a conservation culture also are to account for the biggest length, it is mentioned that following data: desulfurizing fly ash unit 18,000,000 kilowatts in 2014, denitration 1.3 hundred million kilowatts, dedusting 1.8 hundred million kilowatts, from these it can be seen that Environmental pollution is gone out severely.

Glass and cement industry are also the fields that state key is paid close attention at present, although it is less relative to its proportion of thermal power generation, but country is also to be made that its discharge to be explicitly indicated, glass industry: discharged nitrous oxides mark is not more than 700mg/Nm3, sulfide is not more than 400mg/Nm3, and dust is not more than 50mg/Nm3；Cement industry: discharged nitrous oxides mark is not more than 400mg/Nm3, and sulfide is not more than 200mg/Nm3, and dust is not more than 30mg/Nm3.

The flue gas treating process of glass industry is the most generally taked to draw flue gas from the temperature window of waste heat boiler about 350 DEG C and is entered high-temperature electric dust pelletizing system dedusting, flue gas enters SCR denitration system subsequently, and dedusting, denitration flue gas up to standard enter waste heat boiler immediately and reclaim heat to about 120 DEG C entrance dry desulfurization devices and eventually through chimney eliminating air.But owing to the particularity of glass industry, i.e. dust particle are minimum and have stronger stickiness, generally there are some problems in this technique at present: 1) high-temperature electric efficiency of dust collection is extremely difficult to design efficiency；2) pipe boosting in pole is often broken down, system fluctuation of service；3) denitrating catalyst is caused quickly to inactivate due to the problem of high-temperature electric dedusting, so that denitration runs some months and is unable to reach design efficiency；4) there are two dust collecting process in this technique, bag-type dust removal system necessary to electric dust-removing process and dry desulfurization, so that system redundancy, causes investment, operation cost excessive.

The flue gas treating process of cement industry: 1) denitration employing SNCR denitration technology, spray into reducing agent at the suitable temperature window before five-stage whirlwind and realize denitration.Due to cement industry SNCR denitration limited efficacy, generally 40-50%, NOx can only be down to about 400-500mg/Nm3, for the environmental protection policy of increasingly stringent, its aobvious " having a heart but no strength ".At present the focus of research concentrates on low-temperature denitration, there is no successfully so far, researches and develops a kind of gas denitrifying technology being suitable for cement industry extremely the most urgent；2) cement industry dedusting uses dust settling pocket technique, and dust removing effects is up to discharging standards, but exists and stick with paste bag, the problem that operation maintenance workload is excessive；3) it is currently not, due to cement industry desulfurization, the emphasis that country pays close attention to, therefore cement industry is not equipped with desulfurizer.

Utility model content

This utility model purpose is intended to, it is provided that a kind of tail gas desulfurization, denitration, dust removal integrated processing means；In particular for glass industry, cement industry, a kind of economically viable device being satisfied with present and following increasingly stringent environmental protection standard is proposed.

Technical solutions of the utility model are, a kind of tail gas desulfurization, denitration, dust removal integrated processing means, it is characterized in that: include tail gas mixing arrangement, integration catalyst ceramic filter drum device, booster fan and energy-recuperation system, before integration catalyst ceramic filter drum device, flue gas mixing arrangement is set；Integration catalyst ceramic filter drum device arranges back-blowing dust removing device；Being provided with desulfurizing agent and denitrfying agent jetting device in tail gas mixing arrangement, booster fan enters chimney by the outlet of pipeline connecting integration catalyst ceramic filter drum device and after sending into energy-recuperation system.

During application, flue gas is introduced integration catalyst ceramic filter drum device from suitable temperature section；Integration catalyst ceramic filter drum device arranges back-blowing dust removing device；Desulfurizing agent and denitrfying agent inject before tail gas enters integration catalyst ceramic filter drum device；Need to arrange flue gas mixing arrangement before integration catalyst ceramic filter drum device；Process flue gas up to standard and enter energy-recuperation system recovery heat by booster fan, and be ultimately discharged into chimney；Described suitable temperature section 280-420 DEG C.Described back-blowing dust removing device is controlled blowback trachea by several electromagnetic valve groups and constitutes.

The described coalition that integrated catalyst ceramic filter drum device is ceramic filter drum and SCR catalyst, i.e. lumps together ceramic material and denitrating catalyst active component V/Ti/W and oxide etc. on microcosmic.

Described desulfurizing agent is the alkaline matter including Calx.

Denitrfying agent is the reducing agents such as liquefied ammonia, ammonia or carbamide.

Tail (cigarette) gas mixing arrangement is reaction tower, and reaction tower is dry-type circulating fluidized bed reaction tower, and smoke inlet is Venturi tube structure.

Energy-recuperation system is waste heat boiler or heat exchanger.

Denitrfying agent injection apparatus is arranged in flue gas mixing arrangement, it is achieved denitrfying agent and flue gas mixing, i.e. this position sprays into denitrfying agent, and its spray regime is that circulating type sprays into or uniform face sprays into mode.

Desulfurizing agent, denitrfying agent consumption control mode use cascade control system, and including two actuators, desulfuration efficiency, denitration efficiency are main regulation variable, and outlet SO2 and NOx value are secondary regulated variable.

The beneficial effects of the utility model are:

1, realizing desulphurization and denitration, dust removal integrated, technique is simple；

2, dust content can be made to be down to 2mg/Nm3 by integration catalyst ceramic device even lower, it is long that ceramic tube products stablize the life-span, and system stability is reliable, can save manpower maintenance and operating cost；

3, the discharge standard that country formulates for the industry such as glass, cement can be met, 99% suspension shot-like particle and 95% vaporous pollutant and sour gas (SOx, NOx, HCl) can be processed；

4, the firm heatproof of ceramic screen pipe is not burnt, and can exempt filter cloth breakage idle cost；

5, life of product is long, and chimney filter surface can effectively stop the metals such as the harm arsenic of catalyst, selenium and sodium, significantly extends the service life of catalyst；

6, operation cost and floor space relatively traditional method saves 20-30%；

In a word, this technique has that system stability is reliable, maintenance workload is little, long product lifecycle, device operation cost are low and the advantage such as plant area area is little；Flow into waste heat boiler flue gas be clean flue gas so that heat exchange efficiency and service life of equipment significantly promote, bring huge economic benefit.

Accompanying drawing explanation

Fig. 1 is process chart of the present utility model.

Detailed description of the invention

Explain as a example by cement industry denitrating flue gas, Fig. 1 is the structural representation of this new technology device, as it can be seen, this system mainly includes desulfurizing agent injection apparatus 2, denitrfying agent injection apparatus 3, flue gas mixing arrangement 5, integration catalyst ceramic filter drum device 7, energy recycle device 9.Desulfurizing agent injection apparatus 2 is arranged on the gas approach 1 of device, and spray into flue gas mixing arrangement 5 by venturi type structure 4 and carry out mixing and preliminary desulphurization reaction, in order to realize higher desulfuration efficiency and reduce the consumption of desulfurizing agent, flue gas mixing arrangement 5 can be set to recirculating fluidized bed reaction tower, i.e. realizes not recycling of reaction desulfuration completely from dust collect plant 6 extension circulating ash to flue gas mixing arrangement 5；Denitrfying agent injection apparatus 3 is arranged in the correct position of flue gas mixing arrangement 5 and realizes denitrfying agent and flue gas mixing, i.e. this position sprays into denitrfying agent, and its spray regime is that circulating type sprays into or uniform face sprays into mode；Desulfurizing agent, denitrfying agent consumption control mode use cascade control system, and it includes two actuators, and desulfuration efficiency, denitration efficiency are main regulation variable, and outlet SO2 and NOx value are secondary regulated variable.Flue gas flows into integration catalyst ceramic filter drum device 7 with flue, there is deep desulfuration, dedusting and denitration reaction simultaneously thus realize desulphurization and denitration, dust removal integrated, during operation, filter cylinder outer surface can form filter cake texture thus stops the murder by poisoning to catalyst such as As, Se i.e. alkali metal, significantly extends service life of product to 8-10；Arrange back-blowing dust removing device 8 realize filter cylinder reverse gas cleaning ensure integration catalyst ceramic filter drum device 7 run under normal pressure drop；In blowback dust, flue gas, natural subsidence and inertial settling dust fall on dust arrester installation 6, and enter plant area's appointment ash storehouse with ash exhauster 11.Process middle high-temperature gas up to standard to eventually pass energy recycle device 9 and reclaim heat and enter chimney with exhaust pass 10；Flue gas owing to processing through integration catalyst ceramic filter drum device 7 basically reaches cleaning, it is possible to significantly improves the heat exchange efficiency of energy recycle device 9, makes be greatly prolonged its service life simultaneously.Temperature is substantially at 350 DEG C after five-stage whirlwind for cement kiln flue gas, and it is very suitable for middle high temperature denitration；But owing to flue gas containing substantial amounts of dust, up to 80-100mg/Nm3, acidic oxide and basic anhydride deposit in flue gas simultaneously, it can cause the abrasion of catalyst, block and inactivate, thus limits the use under this operating mode of the middle high temperature catalyst V/Ti/W system.After the technique of the big heat of research at present is for using waste heat boiler to reclaim heat, flue-gas temperature is down to 120-180 DEG C, uses bag-type dust, and realizes low-temperature denitration eventually through low temperature catalyst, but low temperature catalyst has high requirement to the content of SO2 and H2O at present so that it is cannot industrial applications；Although using flue gas reheater to be warming up to 300-350 DEG C can realize normal middle low-temperature denitration reaction, but energy consumption being very big, operating cost is high；Simultaneously because through the flue gas of waste heat boiler not through dust arrester, it contains substantial amounts of dust, it can wear and tear, block heat exchanger component thus cause heat exchange efficiency to reduce and the service life of waste heat boiler；This utility model can solve this problem.Desulfurizing agent described in step (3) is the alkaline matter such as Calx, trona；Denitrfying agent described in step (3) is the reducing agents such as liquefied ammonia, ammonia, carbamide；Desulfurizing agent, SCR denitration agent also can all use ammonia and the ammonia of routine.

The foregoing is only more excellent embodiment of the present utility model, not in order to limit this utility model, all any amendment, equivalent and improvement etc. in institute dwelling within spirit of the present utility model and principle, all should be within protection category of the present utility model.

Claims (3)

1. a tail gas desulfurization, denitration, dust removal integrated processing means, it is characterised in that: include tail gas mixing arrangement, integration catalyst ceramic filter drum device, booster fan and energy-recuperation system, before integration catalyst ceramic filter drum device, flue gas mixing arrangement is set；Integration catalyst ceramic filter drum device arranges back-blowing dust removing device；Being provided with desulfurizing agent and denitrfying agent jetting device in tail gas mixing arrangement, booster fan enters chimney by the outlet of pipeline connecting integration catalyst ceramic filter drum device and after sending into energy-recuperation system.

Processing means the most according to claim 1, it is characterised in that: tail gas mixing arrangement is reaction tower, and reaction tower is dry-type circulating fluidized bed reaction tower, and smoke inlet is Venturi tube structure.

Processing means the most according to claim 1, it is characterised in that: energy-recuperation system is waste heat boiler or heat exchanger.