CN205127749U - Well low temperature flue gas integration treatment device - Google Patents

Abstract

The utility model relates to a well low temperature flue gas integration treatment device, ammonia mixing section and 1 denitration reaction section are spouted in 1 pyrolysis of 2 desulfurization dedusting section sharings, and 2 the desulfurization dedusting section in bottom are located flue gas pipeline both sides respectively, and establish flue gas entry and flue gas pipeline intercommunication, 2 desulfurization dedusting section's top exhanst gas outlet interconnected respectively to ammonia mixing section and denitration reaction section are spouted in the pyrolysis that connects gradually upper portion. The utility model discloses a flue gas desulfurization and dust removal, denitration, the on -the -spot pyrolysis regeneration integration of denitration catalyst can be saved and once invested in, reduce the working costs, reduce area, and the desulfurization are efficient, 2 individual desulfurization dedusting section share 1 pyrolysis and spouts ammonia mixing section and 1 denitration reaction section, has simplified upper portion tower body structure under functional requirement's the prerequisite satisfying, has reduced equipment consumptive material and loading.

Description

Low-temperature flue gas integrated treatment unit in one

Technical field

The utility model relates to middle low-temperature flue gas desulphurization denitration technical field, particularly relates to low-temperature flue gas integrated treatment unit in one.

Background technology

Flue gas NH ₃-SCR method denitration technology is broadly divided into three types by the flue-gas temperature handled by it: the first is high-temperature flue gas denitration, and smoke treatment temperature is 300 ~ 400 DEG C; The second is middle temperature denitrating technique, and smoke treatment temperature is 240 ~ 300 DEG C; The third is low-temperature denitration technique, and smoke treatment temperature is 120 ~ 240 DEG C.

The first high-temperature flue gas denitration technology is worldwide widely used in power plant's denitrating technique, and the second, the third denitration technology are just tried out at present in the denitration of heating fire coal boiler fume, glass furnace flue-gas denitration process.Compared with the first high-temperature flue gas denitration technology, the second and in the third limitation of low-temperature denitration technology be that content of sulfur dioxide in flue gas and water content can produce impact greatly to denitration efficiency.

Traditional handicraft during low-temperature denitration technique, can, at the preposition dry method of denitrating technique or semi-dry desulfurizing process, for removing the particle produced in sweetening process, need establish sack cleaner to carry out filtration, purification to ash-laden gas in employing.But some engineering project, by the restriction in place, cannot arrange sack cleaner and Benitration reactor simultaneously.In addition, small part oxidizing sulfur dioxide can be become sulfur trioxide by low-temperature denitration catalyst, the ammonium hydrogen sulfate that sulfur trioxide and ammonia react generate can condense into emplastic in flue-gas temperature lower than when 230 DEG C, in middle low-temperature denitration technique, and low-temperature denitration efficiency during this emplastic can affect.

Summary of the invention

The utility model provides low-temperature flue gas integrated treatment unit in one, the desulfurization and dedusting of flue gas, denitrification process and denitrating catalyst regenerative process is completed successively in integrated treatment unit, and 2 of integrated treatment unit desulfurization and dedusting sections share 1 pyrolysis spray ammonia mixing section and 1 denitration reaction section, place can be saved, reduce equipment investment cost, improve fume treatment efficiency.

In order to achieve the above object, the utility model realizes by the following technical solutions:

Low-temperature flue gas integrated treatment unit in one, comprises the desulfurization and dedusting section be integrated in same tower body, pyrolysis spray ammonia mixing section and denitration reaction section; 2 desulfurization and dedusting sections share 1 pyrolysis spray ammonia mixing section and 1 denitration reaction section, 2 the desulfurization and dedusting sections in bottom lay respectively at smoke conveying duct both sides, and establish smoke inlet to be communicated with smoke conveying duct respectively, the top exhanst gas outlet of 2 desulfurization and dedusting sections interconnects, and connects pyrolysis spray ammonia mixing section and the denitration reaction section on top successively; Described desulfurization and dedusting section comprises ash silo, airflow uniform distribution deflector, filter bag and pulse spraying equipment; Pyrolysis spray ammonia mixing section comprises spray ammonia structure, pyrolysis gas conveying injection structure body and mixing current equalizing structure body; Denitration reaction section comprises denitrating catalyst and purifying smoke outlet.

Described filter bag is vertically embedding to be hung in card hole, and uniform in arranging more, arranging, airflow uniform distribution deflector is located between smoke inlet and filter bag, and pulse spraying equipment is established on filter bag top.

Described pyrolysis gas conveying injection structure body is made up of the air supply duct that many be arranged in parallel, wherein blast main arranges in pyrolysis spray ammonia mixing section bilateral symmetry, blowpipe is arranged at pyrolysis spray ammonia mixing section alternate internal, on blowpipe, uniform orifice feeding mouth, blast main establishes volume damper; Spray ammonia structure is located at above pyrolysis gas conveying injection structure body, the spray ammonia pipeline be arranged in parallel by many forms, and ammonia supervisor arrange in top tower body bilateral symmetry, ammonia arm interlaced arrangement in device, ammonia supervisor is equipped with spray ammonia control valve, uniform ammonia jet on ammonia arm; Mixing current equalizing structure body is located at above spray ammonia structure, and protruded ripple plate that is curved by 1-4 layer or fold-line-shaped forms, and presses broken line direction 90 ° of interlaced arrangement between adjacent 2 layers of protruded ripple plate.

Described denitrating catalyst divides by layer 2-4 setting, and purifying smoke outlet is located at integrated treatment unit top.

The surface of described airflow uniform distribution deflector is undulatory labyrinth type structure.

Compared with prior art, the beneficial effects of the utility model are:

1) realize flue gas desulfurization and dedusting, denitration, denitrating catalyst on-the-spot pyrolysis regeneration integration, save and once invest, reduce operating cost, reduce floor space;

2) 2 desulfurization and dedusting sections share 1 pyrolysis spray ammonia mixing section and 1 denitration reaction section, simplify upper column body structure, reduce equipment consumptive material and loading under the prerequisite that content with funtion requires;

3) first dedusting before denitration, reduces dust in flue gas by the wearing and tearing to catalyst surface during denitration catalyst oxidant layer, effectively can extend denitrating catalyst service life, reduce denitrating catalyst consumption;

4) by all pressures effect of sock filtration layer and mixing current equalizing structure body, uniform on integrated treatment unit cross section of flue gas can be realized, make velocity of flue gas field, thermo parameters method more even, improve denitration efficiency further;

5) pyrolysis gas blast main and ammonia supervisor arrange in pyrolysis spray ammonia mixing section bilateral symmetry, pyrolysis gas blowpipe and ammonia arm interlaced arrangement in device, can make the heat smoke in jetting device, ammonia air-flow evenly, mix more abundant with coke oven flue gas;

6) ammonia is by the spray ammonia mouth jetting device of distributed in grid, and high temperature pyrolysis gas is sent in flue gas by orifice plate air outlet, can make ammonia and flue gas, high temperature pyrolysis gas and smoke contacts more fully, mix evenly;

7) pyrolysis denitrating catalyst can be regenerated online, when not affecting process system and normally working, by utilizing the emplastic on high-temperature flue gas decomposition catalyst surface, cleaning catalyst surface, improves catalytic efficiency and the service life of denitrating catalyst further;

8) the denitrating catalyst soot cleaning system in traditional handicraft can be simplified or omit;

9) flue gas is by sock filtration process, and the desulfurizing agent not participating in reaction under filtering with filter bag outer surface fully contacts, and removing in flue gas while Desulphurization by filter bag, improves the desulfuration efficiency of flue gas further.

Accompanying drawing explanation

Fig. 1 is main pseudosection of the present utility model.

Fig. 2 is side cutaway view of the present utility model.

In figure: 1. desulfurization and dedusting section 1a. ash silo 1b. airtight unloading valve 1c. smoke inlet 1d. airflow uniform distribution deflector 1e. filter bag 1f. pulse spraying equipment 2. pyrolysis spray ammonia mixing section 2a. spray ammonia pipeline 2b. pyrolysis gas conveyance conduit 2c. volume damper 2d. orifice feeding mouth 2e. mixing current equalizing structure body 2f. spray ammonia control valve 3. denitration reaction section 3a. denitrating catalyst 3b. purifying smoke exports 4. smoke conveying ducts

Detailed description of the invention

Below in conjunction with accompanying drawing, detailed description of the invention of the present utility model is described further:

Seeing Fig. 1-Fig. 2, is structural representation of the present utility model.Low-temperature flue gas integrated treatment unit in the utility model one, comprises the desulfurization and dedusting section 1 be integrated in same tower body, pyrolysis spray ammonia mixing section 2 and denitration reaction section 3; 2 desulfurization and dedusting sections 1 share 1 pyrolysis spray ammonia mixing section 2 and 1 denitration reaction section 3,2 the desulfurization and dedusting sections 1 in bottom lay respectively at smoke conveying duct 4 both sides, and establish smoke inlet 1c to be communicated with smoke conveying duct 4 respectively, the top exhanst gas outlet of 2 desulfurization and dedusting sections 1 interconnects, and connects pyrolysis spray ammonia mixing section 2 and the denitration reaction section 3 on top successively; Described desulfurization and dedusting section 1 comprises ash silo 1a, airflow uniform distribution deflector 1d, filter bag 1e and pulse spraying equipment 1f; Pyrolysis spray ammonia mixing section 2 comprises spray ammonia structure, pyrolysis gas conveying injection structure body and mixing current equalizing structure body; Denitration reaction section 3 comprises denitrating catalyst 3a and purifying smoke outlet 3b.

Described filter bag 1e is vertically embedding to be hung in card hole, and uniform in arranging more, arranging, airflow uniform distribution deflector 1d is located between smoke inlet 1c and filter bag 1e, and filter bag 1e establishes pulse spraying equipment 1f in top.

Described pyrolysis gas conveying injection structure body is made up of the pyrolysis gas conveyance conduit 2b that many be arranged in parallel, wherein blast main arranges in pyrolysis spray ammonia mixing section 2 bilateral symmetry, blowpipe is arranged at pyrolysis spray ammonia mixing section 2 alternate internal, on blowpipe, uniform orifice feeding mouth 2d, blast main establishes volume damper 2c; Spray ammonia structure is located at above pyrolysis gas conveying injection structure body, the spray ammonia pipeline 2a be arranged in parallel by many forms, wherein ammonia supervisor arranges in upper pyrolysis spray ammonia mixing section 2 bilateral symmetry, ammonia arm is interlaced arrangement in pyrolysis spray ammonia mixing section 2, ammonia supervisor is provided with spray ammonia control valve 2f, uniform ammonia jet on ammonia arm; Mixing current equalizing structure body is located at above spray ammonia structure, and protruded ripple plate that is curved by 1-4 layer or fold-line-shaped forms, and presses broken line direction 90 ° of interlaced arrangement between adjacent 2 layers of protruded ripple plate.

Described denitrating catalyst 3a divides by layer 2-4 setting, and purifying smoke outlet 3b is located at integrated treatment unit top.

The surface of described airflow uniform distribution deflector 1d is undulatory labyrinth type structure.

Be made up of ash silo 1a and airtight unloading valve 1b bottom desulfurization and dedusting section 1, airtight unloading valve 1b is located at ash silo 1a discharge outlet.Ash silo 1a is for collecting and storing the particle separated from flue gas, and an effect of airtight unloading valve 1b prevents from extraneous air from infiltrating device inside by discharging opening to reduce flue-gas temperature, and another effect is the dust granules thing that discharge ash silo 1a collects.

2 desulfurization and dedusting sections 1 are arranged symmetrically with, and smoke conveying duct is between 2 desulfurization and dedusting sections 1, and top is all sprayed ammonia mixing section 2 with pyrolysis and is communicated with; Smoke inlet 1c is located on the inner side tower body above desulfurization and dedusting section 1 ash silo, and filter bag 1e is vertically embedding to be hung in the card hole of desulfurization and dedusting section 1, and uniform in arranging more, arranging, airflow uniform distribution deflector 1d is located between smoke inlet 1c and filter bag 1e.Airflow uniform distribution deflector 1d is the labyrinth type structure of corrugated steel composition, crude separation can be carried out to coarse granule coal dust contained in dirt gas, water conservancy diversion is carried out to ash-laden gas simultaneously, make the air flow method on filter bag 1e surface even, avoid dusty gas directly to wash away filter bag 1e surface, affect filter bag 1e service efficiency and service life.Pulse spraying equipment 1f is located in pure qi (oxygen) region, filter bag 1e top, for carrying out pulse backblowing deashing to filter bag 1e.

When containing sulfur dioxide in flue gas, under the effect of low-temperature denitration catalyst 3a, understand some sulfur dioxide and be converted to sulfur trioxide, sulfur trioxide and ammonia react, generate ammonium hydrogen sulfate, thick material can be condensed in flue-gas temperature lower than when 230 DEG C, stick to denitrating catalyst 3a surface, cause effective contact area of flue gas and denitrating catalyst 3a to reduce, reduce the denitration efficiency of low-temperature denitration catalyst 3a.Therefore, after low-temperature flue gas runs a period of time by denitrating catalyst 3a, for ensureing that denitrating catalyst 3a keeps higher denitration efficiency at flue gas containing under sulfur dioxide condition, need to the capable pyrolysis regeneration of denitrating catalyst 3a.

The technical process of a kind of middle low-temperature flue gas integrated treatment unit of the utility model, comprise desulfurization and dedusting, denitration and denitrating catalyst regenerative process, above process is carried out in integrated treatment unit, and 2 of integrated treatment unit desulfurization and dedusting sections 1 share 1 pyrolysis spray ammonia mixing section 2 and 1 denitration reaction section 3; Specifically comprise the steps:

1) ash-laden gas enters 2 desulfurization control of dust sections 1 respectively by smoke inlet 1c, in each desulfurization control of dust section 1, flue gas is by airflow uniform distribution deflector 1d water conservancy diversion, big dust particle falls into bottom ash silo 1a, and the outer surface that in flue gas, the desulfurizing agent of non-complete reaction and Desulphurization dust are attached to filter bag 1e forms dust layer; When follow-up flue gas is by dust layer, the sulfur dioxide in flue gas and the abundant haptoreaction of unreacted sorbent particle, the particle that filter bag 1e traps regularly is jetted by pulse spraying equipment 1f, makes it fall into bottom ash silo 1a; Top pyrolysis spray ammonia mixing section 2 is entered after 2 desulfurization and dedusting sections 1 are converged respectively through the flue gas that dust-filtering purifies;

2) ammonia evenly sends into pyrolysis spray ammonia mixing section 2 by spray ammonia structure spray ammonia pipeline 2a, fully mixes contact with flue gas; Under all pressures immixture of mixing current equalizing structure body, flue gas and ammonia Homogeneous phase mixing, and make flue gas along the velocity field of integrated treatment unit cross section and temperature field uniform;

3) enter denitration mixing section 3 with the abundant mixed flue gas of ammonia, under the catalytic action of denitrating catalyst 3a, reduction of nitrogen oxide is become nitrogen and water by ammonia, and the neat stress after denitration flows out from purifying smoke outlet 3b;

4) when the denitration efficiency of denitrating catalyst 3a is reduced to below 60%, by the orifice feeding mouth 2d that pyrolysis gas conveyance conduit 2b is arranged, high temperature pyrolysis gas uniform is sent into pyrolysis spray ammonia mixing section 2; High temperature pyrolysis gas fully contacts with flue gas, and under all pressures and immixture of mixing current equalizing structure body Homogeneous phase mixing, air-flow is uniform on integrated treatment unit cross section; When temperature is the mist arrival denitration mixing section 3 of 380 ~ 400 DEG C, the ammonium hydrogen sulfate sticking to denitrating catalyst 3a surface can be decomposed, purification denitrating catalyst 3a surface, thus improve the denitration efficiency of denitrating catalyst 3a.

Claims (5)

1. a low-temperature flue gas integrated treatment unit in, comprises the desulfurization and dedusting section be integrated in same tower body, pyrolysis spray ammonia mixing section and denitration reaction section; It is characterized in that, 2 desulfurization and dedusting sections share 1 pyrolysis spray ammonia mixing section and 1 denitration reaction section, 2 the desulfurization and dedusting sections in bottom lay respectively at smoke conveying duct both sides, and establish smoke inlet to be communicated with smoke conveying duct respectively, the top exhanst gas outlet of 2 desulfurization and dedusting sections interconnects, and connects pyrolysis spray ammonia mixing section and the denitration reaction section on top successively; Described desulfurization and dedusting section comprises ash silo, airflow uniform distribution deflector, filter bag and pulse spraying equipment; Pyrolysis spray ammonia mixing section comprises spray ammonia structure, pyrolysis gas conveying injection structure body and mixing current equalizing structure body; Denitration reaction section comprises denitrating catalyst and purifying smoke outlet.

2. low-temperature flue gas integrated treatment unit in one according to claim 1, it is characterized in that, described filter bag is vertically embedding to be hung in card hole, uniform in arranging more, arranging, airflow uniform distribution deflector is located between smoke inlet and filter bag, and pulse spraying equipment is established on filter bag top.

3. low-temperature flue gas integrated treatment unit in one according to claim 1, it is characterized in that, described pyrolysis gas conveying injection structure body is made up of the pyrolysis gas conveyance conduit that many be arranged in parallel, wherein blast main arranges in pyrolysis spray ammonia mixing section bilateral symmetry, blowpipe is arranged at pyrolysis spray ammonia mixing section alternate internal, on blowpipe, uniform orifice feeding mouth, blast main establishes volume damper; Spray ammonia structure is located at above pyrolysis gas conveying injection structure body, the spray ammonia pipeline be arranged in parallel by many forms, wherein ammonia supervisor arranges in top tower body bilateral symmetry, ammonia arm interlaced arrangement in device, ammonia supervisor is equipped with spray ammonia control valve, uniform ammonia jet on ammonia arm; Mixing current equalizing structure body is located at above spray ammonia structure, and protruded ripple plate that is curved by 1-4 layer or fold-line-shaped forms, and presses broken line direction 90 ° of interlaced arrangement between adjacent 2 layers of protruded ripple plate.

4. low-temperature flue gas integrated treatment unit in one according to claim 1, is characterized in that, described denitrating catalyst divides by layer 2-4 setting, and purifying smoke outlet is located at integrated treatment unit top.

5. low-temperature flue gas integrated treatment unit in one according to claim 1, is characterized in that, the surface of described airflow uniform distribution deflector is undulatory labyrinth type structure.