CN204127983U - The device of a kind of gas fired-boiler exhaust heat-energy recovery and purification of nitrogen oxides - Google Patents

The device of a kind of gas fired-boiler exhaust heat-energy recovery and purification of nitrogen oxides Download PDF

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CN204127983U
CN204127983U CN201420430431.7U CN201420430431U CN204127983U CN 204127983 U CN204127983 U CN 204127983U CN 201420430431 U CN201420430431 U CN 201420430431U CN 204127983 U CN204127983 U CN 204127983U
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nox
gas
heat exchanger
temperature
flue
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佘洪舟
佘名汉
赵刚
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Abstract

A device for the recovery of gas fired-boiler exhaust heat-energy and purification of nitrogen oxides, belongs to purification of nitrogen oxides and energy recovery technical field.Comprise three parts: flue gas cool-down and heat recovery system, NOx adsorption system, NOx adsorbent desorption and regeneration system.Flue gas can be dropped to lower temperature by this device, is the necessary condition of adsorption cleaning, and adsorption cleaning in turn ensure that high efficient heat recovery after low-temperature flue gas there will be no HNO 3, HNO 2corroding metal pipeline, therefore the cooperative compensating system of NOx adsorption cleaning and energy recovery solves the problems such as NOx gaseous contamination purification, high efficient heat recovery and pipe-line system corrosion simultaneously.

Description

The device of a kind of gas fired-boiler exhaust heat-energy recovery and purification of nitrogen oxides
Technical field
The utility model relates to nitrogen oxide (NOx) purification and the heat-energy recovering apparatus of gas fired-boiler discharge flue gas, specifically have: metallic recuperator, resistant material manufacture heat exchanger, heat pump, the adsorbent equipment of NOx adsorption Special adsorbent is housed, to the regenerative system that adsorbent regenerates, during regeneration, multistage absorption makes the production system of nitric acid, belongs to purification of nitrogen oxides and energy recovery technical field.
Background technology
There is more haze weather in the many cities of recent year, main cause is industrial development, automobile quantity increase etc. causes.The NOx that Industrial Boiler (comprising kiln and gas fired-boiler etc.) and combustion in IC engine produce rolls up, and is discharged in air and forms aerosol with water in air, becomes an important component part of haze.Combustion adjuvant great majority during the burning such as Industrial Boiler, internal combustion engine use air, the N in air 2and O 2can form NOx by chemical combination under the condition of these burning arrival more than 700 DEG C, the amount of the higher chemical combination of temperature is larger.Due to difficult lower than burning when 700 DEG C, therefore these combustion cases are all greater than 700 DEG C or higher.Therefore must there is a large amount of NOx in combustion product gases, become important pollution sources.Now in order to solve NOx emission problem, many combustion furnaces adopt low-temperature burning technology, decrease the content of the rear NOx of burning, but content are still higher.Another kind method adopts catalytic reduction technique, and NOx reducing agent is generated N2, H2O, CO2 etc. as reacted when NH3, CO, CH4 are greater than 400 DEG C of temperature under catalysts conditions.These methods can reduce the discharge capacity of NOx, but need cost high, consume energy high, and limited efficacy, economy is also be not as good as absorption method process NOx.Catalytic reaction must be greater than more than 400 DEG C, needs additionally to consume energy, and absorption method needs to reduce temperature, reclaimed heat energy while purification.The degree of purification of absorption method is high, and after purification, the concentration of emission of actual needs all can reach.In an experiment, adsorption efficiency controls in 60% ~ 80%, and in emission, NOx content only has 60 ~ 30mg/m 3.Boiler heat-energy recovery aspect, owing to containing a large amount of NOx in combustion product gases, flue gas forms acidic liquid lower than when 100 DEG C, now widely used boiler energy-saving heat exchanger is all metal material, gas pipeline, chimney etc. are also all metal materials, can not resist corrosion, in the boiler hot exchange system of therefore practical application at present, flue gas often can only cool to the just directly discharge of 100 degrees centigrade, to avoid etching apparatus and pipeline by heat exchange.But a large amount of heat energy of the most worth recovery are the latent heat that wherein steam discharges in the temperature-fall period of 90 DEG C ~ 50 DEG C in flue gas, therefore the boiler energy-saving equipment of at present application mostly can only the sensible heat of gas recovery more than 100 DEG C, and latent heat huger by comparison cannot effectively reclaim, energy-saving efficiency is lower.
Utility model content
The feature of the utility model device is as follows with the problem that can solve:
1. in the tail gas of purifying gas boiler (comprising kiln, heating boiler, fuel gas generation etc.) and internal combustion engine, fire row venting, NOx pollutes and energy recovery.Utilize the Special adsorbent of adsorbent equipment and NOx to carry out adsorption cleaning NOx after lowering the temperature to flue gas, make emission compliance, and the efficiency of purification is very high.
2. adopt the utility model to carry out adsorption cleaning and be different from high and that control the is complicated Catalytic Reducing Purification mode that consumes energy, normal temperature absorption itself is energy-conservation, easy gas purification mode.
3. the condition of adsorption cleaning is normal temperature (20 ~ 30 DEG C), and this just requires that the heat energy of combustion product gases needs release, and the heat energy of release contains a large amount of latent heat, makes recovery become feasible, has saved fuel, decreased carbon emission.
4. the Application of composite of anticorrosion graphite polypropylene heat exchanger and adsorption cleaning, solves the problem forming acidic liquid etching apparatus and pipeline from NOx the whole flow process cooling to purification and discharge.
5., after etching problem solves, just combustion product gases can be reduced to 20 ~ 30 DEG C from more than 100 DEG C, solve the problem reclaiming topmost steam latent heat.Practical application uses multi-stage heat exchanger mode, and uses heat pump techniques to assist, and flue-gas temperature can be dropped to perfect condition, reclaims latent heat and the obvious heat of smoke of condensed water.
6. work as a large amount of NOx of adsorbent, when the gas of discharge is close to local environmental protection standard, thinks that adsorbent has reached use saturated, can regenerate adsorbent.
7. adsorbent reactivation adopts little tolerance, negative pressure heating complex method, is parsed by the NOx of absorption, and the NOx concentration in the gas of at this moment discharging is higher.
8., containing the method that the gas of high concentrate NOx can absorb by multi-level water, absorb and form nitric acid.By the NOx that adsorbs when there being oxygen, under the effect of adsorbent surface catalysis, oxidation, NO is constantly oxidized, substantially already oxidised is NO2, repeatedly after cyclic absorption, when the NOx concentration in gas is very low, again send a small amount of for residue gas back to purifier, to guarantee the closure of system, environment is not had any impact.
The utility model device comprises flue gas cool-down and heat recovery system, NOx adsorption system, NOx adsorbent desorption and regeneration system.The flue gas of boiler combustion outlet, general temperature is at 110 DEG C ~ about 150 DEG C.The utility model take blower fan as the power source of whole system gas flowing, the high-temperature flue gas of boiler emission is made to enter system, when adopting the utility model device to carry out the recovery of gas fired-boiler exhaust heat-energy and purification of nitrogen oxides, first flue gas cool-down and residual neat recovering system is utilized to lower the temperature to flue gas, simultaneously by heat energy contained by heat exchange recovered flue gas.Multi-stage heat exchanger is used to realize this process.
The device of a kind of gas fired-boiler exhaust heat-energy recovery and purification of nitrogen oxides, it is characterized in that, comprise three parts: flue gas cool-down and heat recovery system, NOx adsorption system, NOx adsorbent desorption and regeneration system, flue gas cool-down and heat recovery system comprise metallic recuperator, first order graphite polypropylene heat exchanger, second level graphite polypropylene heat exchanger, NOx adsorption system comprises NOx adsorption plant and blower fan, and NOx adsorbent desorption and regeneration system comprises vavuum pump, multistage NOx absorption system and nitric acid collector, wherein metallic recuperator, first order graphite polypropylene heat exchanger, second level graphite polypropylene heat exchanger is equipped with the condensation of gas water outlet of discharging for condensation of gas water in gas piping, each condensation of gas water outlet is connected with condensate collector respectively, the flue tail gas outlet of metallic recuperator is connected with the flue tail gas import of first order graphite polypropylene heat exchanger, the flue tail gas outlet second level graphite polypropylene heat exchanger flue tail gas import of first order graphite polypropylene heat exchanger connects, second level graphite polypropylene heat exchanger flue tail gas outlet is connected with NOx adsorption plant, NOx adsorption plant is connected with blower fan, NOx adsorption plant is also connected with vavuum pump simultaneously, vavuum pump is connected with the air inlet of multistage NOx absorption system, liquid withdrawal system bottom NOx absorption system is connected with nitric acid collector, NOx absorption system top is connected with NOx adsorption plant, NOx adsorption plant and the connection between blower fan and vavuum pump all can carry out the switching opened and close.
First order graphite polypropylene heat exchanger also can carry out the modulation be not connected with metallic recuperator.Metallic recuperator and first order graphite polypropylene heat exchanger adopt cooling water to cool, and second level graphite polypropylene heat exchanger is then connected with source pump and cools.
Multistage NOx absorption system is generally conventional multi-level gas absorption tower.
NOx adsorption plant, built with NOx adsorbent, is also provided with firing equipment in NOx adsorption plant simultaneously.
Adopt said apparatus to carry out the technological process of the recovery of gas fired-boiler exhaust heat-energy and purification of nitrogen oxides, comprise the following steps:
(1) smoke treatment exhaust temperature is at 110 DEG C ~ 150 DEG C, and the heat exchange progression of flue gas cool-down and residual neat recovering system is minimum is two-stage, when handled flue tail gas temperature is more than or equal to 120 DEG C, graphite polypropylene conversion materials there will be the problem that intensity declines, this situation will arrange one-level metallic recuperator before graphite polypropylene heat exchanger, heat exchange is vapor liquid heat exchange, make to be more than or equal to 120 DEG C of flue tail gas to be first down to through one-level metallic recuperator and to be not less than 100 DEG C, preferably 100 DEG C, one-level metallic recuperator temperature-fall period makes the partial heat of flue tail gas reclaim, for heating boiler system, the boiler blow-down water (water at low temperature of one-level metallic recuperator) of part heating is introduced, heating temperature direct heating is warmed to through one-level metallic recuperator, or enter boiler again after lifting temperature, as the auxiliary heating of boiler, water vapor condensation in one-level metallic recuperator in part flue tail gas is condensed water and collects, if when handled flue tail gas temperature is lower than 120 DEG C, directly enter next step,
(2) from one-level metallic recuperator flue tail gas out or do not carry out the cooling of one-level metallic recuperator and temperature enters graphite polypropylene heat exchanger (2) lower than the former flue tail gas of 120 DEG C, the flue tail gas entering graphite polypropylene heat exchanger (2) is cooled to 50-70 DEG C, graphite polypropylene heat exchanger (2) interior flue tail gas and water carry out heat exchange, this process is called the high temperature heat exchange stage, in this high temperature heat exchange stage, a large amount of latent heat of the steam in flue tail gas and part sensible heat are released, a large amount of heat energy can be reclaimed, in this flue tail gas process, most of steam in flue tail gas becomes water, also have small part NOx soluble in water simultaneously, form the lower nitric acid of concentration and nitrous acid, its pH value is 6 ~ 5.5,
(3) flue tail gas of discharging from graphite polypropylene heat exchanger (2) enters next stage graphite polypropylene heat exchanger (3), flue tail gas temperature is made to be down to 20-30 DEG C, this grade of graphite polypropylene heat exchanger adopts source pump (5) to carry out heat exchange, simultaneously at this temperature-fall period, condensed water is had to generate and collect equally;
(4) adsorbent bed that the flue tail gas being cooled to 20-30 DEG C directly enters sealing is equipped with in the NOx adsorption plant of NOx adsorbent and carries out NOx adsorption, aiutage (11) is connected with NOx adsorption plant via blower fan, and what blower fan (7) flowed for whole system gas provides power source.
After NOx adsorbent is saturated, use decompression desorption method, multistage NOx absorption system (9) is connected with NOx adsorption plant via vavuum pump (8), reduces pressure with the NOx adsorption plant of vavuum pump (8) to sealing; Also be provided with heater in NOx adsorption plant for the gas-heated in NOx adsorption plant, generally make the temperature in NOx adsorption plant higher than the environment temperature 10 DEG C at NOx adsorption plant place, with assisted desorption regeneration process; The gas containing NOx that vavuum pump (8) is extracted out from NOx adsorption plant enters multistage NOx absorption system (9), multistage NOx absorption system (9) is general multi-level gas absorption plant, NOx adopts water to absorb generation salpeter solution and discharges from NOx absorption system (9) bottom and collect, and the gas backstreaming that NOx absorption system (9) top is discharged is in NOx adsorption plant; NOx adsorbent after desorption can continue to recycle.
The heat that above-mentioned three heat exchangers reclaim from flue tail gas recycles.
Above-mentioned sorbent used preferably adsorbent disclosed in 201410139466.x.
Feature of the present utility model:
1. flue gas A1 or A2 of boiler combustion outlet, general temperature is at 110 DEG C ~ about 150 DEG C.Flow process of the present utility model, with the power source that blower fan (7) flows for whole system gas, make the high-temperature flue gas of boiler emission enter system, first utilize flue gas cool-down and residual neat recovering system to lower the temperature to flue gas, simultaneously by heat energy contained by heat exchange recovered flue gas.Multi-stage heat exchanger is used to realize this process.
2. the heat exchange progression of flue gas cool-down and residual neat recovering system design is minimum is two-stage.If handled boiler smoke is more than or equal to 120 DEG C, graphite polypropylene conversion materials there will be the problem that intensity declines, and this situation will arrange one-level metallic recuperator (1) before graphite polypropylene heat exchanger, and flue gas A1 is down to 100 DEG C.Flue gas A1 enters heat exchanger (1), heat exchange is that gas-liquid exchanges, if for heating boiler system, the boiler blow-down water of part heating or water at low temperature (B1) can be introduced, heating temperature (C1) direct heating is warmed to through heat exchange, or enter boiler again after lifting temperature, as the auxiliary heating of boiler.These two kinds of processing method energy recovery and effects of energy saving and emission reduction are identical.If not heating boiler, other situation as fuel gas generation etc., then can be used as other purposes by after water at low temperature heat exchange.On this grade of heat exchange process, flue-gas temperature controls, being not less than 100 DEG C, to there will not be the problems such as condensate corrosion, therefore uses metallic recuperator to guarantee withstand high temperatures, can not be corroded simultaneously.In this one-level flow process, mainly reclaimed the part sensible heat of flue gas, the water yield that heat exchange uses is relatively less.
3. the gas E1 after metallic recuperator (2) cooling enters next stage graphite polypropylene heat exchanger (2).If the flue-gas temperature of boiler export, not higher than 120 DEG C (in figure A2), also can not use metallic recuperator (1), but flue gas A2 is directly allowed to enter graphite polypropylene heat exchanger (2).This one-level uses graphite polypropylene heat exchanger, and object flue-gas temperature is dropped to 70 DEG C ~ 50 DEG C (we can be referred to as the high temperature heat exchange stage).The latent heat of this one-level steam is released in a large number, adds the sensible heat of flue gas, can reclaim a large amount of heat energy, is the recoverable important stage of whole flow process interior heat.In heat exchanger, flue gas and water carry out heat exchange, water temperature and flue-gas temperature are adjustable within the specific limits, water temperature can be determined according to the Land use systems of water after heat absorption, such as, in heating system, water after heating will be directly used in heating, then flue gas and water temperature after heat exchange all will regulate higher, again heats if the water after heating enters boiler, then after water temperature and flue gas heat exchange, temperature all regulates lower.In temperature-fall period, the steam in flue gas becomes water, also has small part NOx soluble in water, and form the lower nitric acid of concentration and nitrous acid, its pH value is 6 ~ 5.5.Common metal heat exchanger can not bear such acid corrosion for a long time, uses the then acid and alkali impact completely of graphite polypropylene material.
4. flue gas E2 enters into afterbody heat exchanger (3) after upper level cooling, and temperature cools to 30 DEG C ~ 20 DEG C by 70 DEG C ~ 50 DEG C.This one-level heat-exchange system employs source pump (5), source pump reduces the water temperature (generally dropping to <10 DEG C) that source water surveys (5-Y), utilize this part water circulation in heat exchanger (3) with flue gas heat exchange, to increase gas-liquid temperature difference to greatest extent, within making gas temperature be lowered to expected range.The heat energy that this part water swaps out is flowed to load-side by source pump simultaneously, and load-side (5-X) is also introduced by the water at low temperature part in heating system by the water heated, and temperature is elevated to by heat pump by this part water can direct applied temperature.Utilize heat pump that flue gas is dropped to lower temperature by this flow process, effectively employ the energy of recovery simultaneously.The Energy Efficiency Ratio >=1:4 of source pump, therefore having reclaimed 4 times while source pump power consumption to the heat energy of consumed electric energy, is totally very energy-conservation.
5. about the calculating of reclaiming heat energy:
Drop to 20 DEG C of calculating by flue gas from 100 DEG C, steam ton boiler combustion discharge 10000m with 10 3the exhaust gas volumn of/h is example:
Gas-firing, containing the steam of 20%, the high calorific power of natural gas deducts low heat valve, is exactly steam latent heat.
1m 3combustion of natural gas produces about 10m 3flue gas, 10000m 3/ h flue gas is by 1000m 3the combustion of natural gas of/h produces.
1000m 3/ h natural gas high calorific power is 9650*1000 kilocalorie, and low heat valve is 8704*1000 kilocalorie, and its (9650-8704) * 1000=946000 kilocalorie of difference is the available heat energy after water vapor condensation.When 100 DEG C, heat is 946000 kilocalories.When 20 DEG C, the heat of water is 946000*2.31%=21852.6 kilocalorie, and its difference is 924147.4 kilocalories.
Obvious heat of smoke (by thermal capacitance 0.3) is 10000* (100 DEG C-20 DEG C) * 0.3=240000 kilocalorie.
Total recovery heat is 924147.4+240000=1164147.4 kilocalorie.
Heating value of natural gas is by 8000 kilocalories/m 3calculate (Beijing area average), can natural gas be saved: 1164147.4/8000=145.5m 3/ h.
6., when flue-gas temperature drops to 20 ~ 30 DEG C (flue gas E3), just can enter the adsorption bed (adsorption plant 6.) that NOx adsorption adsorbent is housed and NOx is adsorbed.The adsorption efficiency of NOx Special adsorbent to NOx is determined by engineering design, initial adsorption efficiency >99% under good state.The saturated extent of adsorption of NOx Special adsorbent theory is about 10% (mass ratio).Saturated adsorption efficiency 75%.From adsorbent equipment flue gas out, the content of NOx detects when practical application, and when adsorbent is saturated, concentration is 30 ~ 50mg/m 3.And concentration is all less than these data before saturation.
7. adsorbent saturated after, use decompression desorption method, with vavuum pump 8. to sealing adsorbent equipment reduce pressure.Adsorption plant (6), can to the gas-heated in adsorption plant with heating apparatus, and heating-up temperature is designed to higher than environment temperature 10 DEG C, with assisted desorption regeneration process.NOx adsorbent after desorption can continue to recycle.
8. desorption gas out contains high concentrate NOx, available multistage absorption device, is that absorbing medium absorbs, makes byproduct nitric acid with water.Absorb the NOx that may also have very low concentrations in last gas, final gas is passed into adsorbent equipment again, can by this part a small amount of NOx of adsorbent, overall flow accomplishes closed circulation and zero-emission, does not produce secondary pollution.
9. the utility model main feature is: first is collaborative solve flue gas corrosion and energy recovery problem, and reaching can the object of high efficiente callback heat energy; Second is the object reaching normal-temperature efficient purification nitrogen-containing oxide flue gas; 3rd is use adsorbent desorption technology, actually can save consumptive material, reduce cost, and reclaimed useful nitric acid.
Accompanying drawing explanation
Fig. 1 is the installation drawing of the recovery of the utility model gas fired-boiler exhaust heat-energy and purification of nitrogen oxides, wherein
1: metallic recuperator
2: first order graphite polypropylene heat exchanger
3: second level graphite polypropylene heat exchanger
4: condensate collector
5: source pump
5-Y: heat pump Yuan Shui side
5-F: heat pump load-side
6:NOx adsorption plant
7: blower fan
8: vavuum pump
9: multistage NOx absorption system
10: nitric acid collector
11: aiutage
A1: boiler emission flue gas (>=120 DEG C)
A2: boiler emission flue gas (<120 DEG C)
B1, B2, B3, B4: low-temperature cooling water
C1, C2, C3, C4: high-temperature cooling water
D1, D2, D3: condensed water
E1:100 DEG C of flue gas
E2:70 ~ 50 DEG C flue gas
E3:30 ~ 20 DEG C flue gas
F: absorb tail gas and send purifier back to
G: gas discharging after purification
X1: flue gas cool-down and heat recovery system
X2:NOx adsorption system
X3:NOx adsorbent desorption and regeneration system.
Detailed description of the invention
Below in conjunction with embodiment the utility model done and illustrate furtherly, but the utility model is not limited to following examples.Fig. 1 is shown in by device schematic diagram of the present utility model, and wherein A1 and A2 selects place import to enter pending gas according to residing flue-gas temperature.
Wherein absorption NO used xthe preparation method of adsorbent: its material quality consists of: natural zeolite 20-50%, attapulgite 10-55%, clay 15-65%; Comprise the following steps:
(1) natural zeolite is pulverized the particle of 2-4mm, then use HNO 3, H 2sO 4or HCl process, HNO 3, H 2sO 4or HCl, below 130 DEG C, carry out drying after process;
(2) NaOH solution process used again by the natural zeolite after step (1) process, carries out drying, be then crushed to more than 200 orders after process at 130 DEG C;
(3) concave convex rod is crushed to more than 100 orders;
(4) natural clay uses HNO 3, H 2sO 4or HCl process, below 130 DEG C, carry out heat drying after process;
(5) natural clay after step (4) process uses NaOH solution process again, carries out baking and banking up with earth drying, be then crushed to 100 orders after process at 130 DEG C;
(6) material mixing step (2), step (3), step (5) prepared, through mixing and wet stirring, forming machine is configured as 1-5mm particle;
(7) by particle roasting, roasting is divided into three phases, and the first stage is roasting 2-4 hour 150 DEG C time; Then heat up, second stage is at 150 DEG C-260 DEG C but do not comprise 150 DEG C of roasting 1-3 hour; Then continue to heat up, the phase III is at 260 DEG C-450 DEG C but do not comprise 260 DEG C of roasting 2-4.5 hour, weighs and is packaged as finished product.
Embodiment 1
The temperature 130 DEG C of flue gas discharged by boiler, NOx concentration 250mg/m 3.
By first order metallic recuperator, flue-gas temperature drops to 100 DEG C.Heat exchanger inflow temperature 45 DEG C.Leaving water temperature 75 DEG C.Can direct heating use.
Flue gas enters second level corrosion-proof heat exchanger, and Outlet Gas Temperature is down to 55 DEG C.Inflow temperature 45 DEG C, leaving water temperature 50 DEG C, this part water is sent boiler back to and is continued heating.
Flue gas drops to 28 DEG C through third level corrosion-proof heat exchanger outlet temperature, can enter the purification that adsorbent equipment carries out NOx.Third level heat exchanger inflow temperature 12 DEG C, leaving water temperature 22 DEG C.This part water surveys circulation temperature lowering at heat pump source water, and with the flue gas heat exchange in third level heat exchanger, the inflow temperature of heat pump other end load-side 45 DEG C, leaving water temperature 65 DEG C, can direct heating.
Flue gas purifies through NOx adsorbent equipment, concentration of emission 30mg/m 3.
After NOx adsorbent is saturated, use decompression desorption method, multistage NOx absorption system (9) is connected with NOx adsorption plant via vavuum pump (8), reduces pressure with the NOx adsorption plant of vavuum pump (8) to sealing; Also be provided with heater in NOx adsorption plant for the gas-heated in NOx adsorption plant, generally make the temperature in NOx adsorption plant higher than the environment temperature 10 DEG C at NOx adsorption plant place, with assisted desorption regeneration process; The gas containing NOx that vavuum pump (8) is extracted out from NOx adsorption plant enters multistage NOx absorption system (9), multistage NOx absorption system (9) is general multi-level gas absorption plant, NOx absorbs generation salpeter solution and discharges from NOx absorption system (9) bottom and collect, and the gas backstreaming that NOx absorption system (9) top is discharged is in NOx adsorption plant; NOx adsorbent after desorption can continue to recycle.
Embodiment 2
Flue-gas temperature 100 DEG C, boiler export NOx concentration 150mg/m 3.
Flue gas enters first order heat exchanger, and this one-level is directly corrosion-proof heat exchanger, and outlet temperature drops to 65 DEG C.The inlet temperature of water is 40 DEG C, and outlet coolant-temperature gage is 50 DEG C.This boiler heating system is direct heating system, and heating water temperature requires 50 DEG C, and the water therefore exported can use in direct heating.
Flue gas enters second level corrosion-proof heat exchanger, and exit gas temperature is 25 DEG C, can enter adsorbent equipment and purify.Inflow temperature 8 DEG C, leaving water temperature 19 DEG C.This part water is surveyed, by the continuous down cycles of heat pump at heat pump source water.Heat pump other end load-side is that the water inlet of 40 DEG C is heated to 50 DEG C, can direct heating use.
Flue gas after absorption in emission gases NOx concentration be 18mg/m 3.
After NOx adsorbent is saturated, use decompression desorption method, multistage NOx absorption system (9) is connected with NOx adsorption plant via vavuum pump (8), reduces pressure with the NOx adsorption plant of vavuum pump (8) to sealing; Also be provided with heater in NOx adsorption plant for the gas-heated in NOx adsorption plant, generally make the temperature in NOx adsorption plant higher than the environment temperature 10 DEG C at NOx adsorption plant place, with assisted desorption regeneration process; The gas containing NOx that vavuum pump (8) is extracted out from NOx adsorption plant enters multistage NOx absorption system (9), multistage NOx absorption system (9) is general multi-level gas absorption plant, NOx absorbs generation salpeter solution and discharges from NOx absorption system (9) bottom and collect, and the gas backstreaming that NOx absorption system (9) top is discharged is in NOx adsorption plant; NOx adsorbent after desorption can continue to recycle.
Embodiment 3
Two tons of gas fired-boiler tail gas nitrogen oxide purifications and heat reclaiming system
Concrete enforcement place: 6# boiler room, community, sea-freight storehouse, Dongcheng District, Beijing
Boiler room unit of operation: century long source (Beijing) Enertech Co., Ltd.
Gas treatment ability 2000m3/h, the boiler 2 of alignment processing steams ton
The system set-up time: in January, 2014 (bringing into operation)
The test report time: in March, 2014
Nitrogen oxygen thing clearance: 85.7%
Energy-conservation: 10.8%
Flue-gas temperature 115 DEG C, boiler export NOx concentration 210mg/m 3.
Flue gas enters first order heat exchanger, and this one-level is directly corrosion-proof heat exchanger, and outlet temperature drops to 67 DEG C.The inlet temperature of water is 38 DEG C, and outlet coolant-temperature gage is 45 DEG C.This boiler heating system is direct heating system, and the water of 45 DEG C can use in direct heating.
Flue gas enters second level corrosion-proof heat exchanger, and exit gas temperature is 25 DEG C, can enter adsorbent equipment and purify.Heat exchanger inflow temperature 6 DEG C, leaving water temperature 16 DEG C.This part water is surveyed, by the continuous down cycles of heat pump at heat pump source water.Heat pump other end load-side is that the water inlet of 38 DEG C is heated to 44 DEG C, can direct heating use.
Through measuring and calculating energy conserving system, boiler thermal output is improve 10.8%.
Flue gas enters NOx adsorbent equipment when temperature is reduced to 25 DEG C, and in emission gases, NOx concentration detected value is 30mg/m 3.The method of sampling meets GB/T 16157-1996 requirement, and detection method is hydrochloride naphthodiamide AAS, and examination criteria meets HJ/T 43-1999 requirement.
Nitrogen oxide removal efficiency is 85.7%.
After NOx adsorbent is saturated, use decompression desorption method, multistage NOx absorption system (9) is connected with NOx adsorption plant via vavuum pump (8), reduces pressure with the NOx adsorption plant of vavuum pump (8) to sealing; Also be provided with heater in NOx adsorption plant for the gas-heated in NOx adsorption plant, generally make the temperature in NOx adsorption plant higher than the environment temperature 10 DEG C at NOx adsorption plant place, with assisted desorption regeneration process; The gas containing NOx that vavuum pump (8) is extracted out from NOx adsorption plant enters multistage NOx absorption system (9), multistage NOx absorption system (9) is general multi-level gas absorption plant, NOx absorbs generation salpeter solution and discharges from NOx absorption system (9) bottom and collect, and the gas backstreaming that NOx absorption system (9) top is discharged is in NOx adsorption plant; NOx adsorbent after desorption can continue to recycle.

Claims (5)

1. the device of a gas fired-boiler exhaust heat-energy recovery and purification of nitrogen oxides, it is characterized in that, comprise three parts: flue gas cool-down and heat recovery system, NOx adsorption system, NOx adsorbent desorption and regeneration system, flue gas cool-down and heat recovery system comprise metallic recuperator, first order graphite polypropylene heat exchanger, second level graphite polypropylene heat exchanger, NOx adsorption system comprises NOx adsorption plant and blower fan, and NOx adsorbent desorption and regeneration system comprises vavuum pump, multistage NOx absorption system and nitric acid collector, wherein metallic recuperator, first order graphite polypropylene heat exchanger, second level graphite polypropylene heat exchanger is equipped with the condensation of gas water outlet of discharging for condensation of gas water in gas piping, each condensation of gas water outlet is connected with condensate collector respectively, the flue tail gas outlet of metallic recuperator is connected with the flue tail gas import of first order graphite polypropylene heat exchanger, the flue tail gas outlet second level graphite polypropylene heat exchanger flue tail gas import of first order graphite polypropylene heat exchanger connects, second level graphite polypropylene heat exchanger flue tail gas outlet is connected with NOx adsorption plant, NOx adsorption plant is connected with blower fan, NOx adsorption plant is also connected with vavuum pump simultaneously, vavuum pump is connected with the air inlet of multistage NOx absorption system, liquid withdrawal system bottom NOx absorption system is connected with nitric acid collector, NOx absorption system top is connected with NOx adsorption plant, NOx adsorption plant and the connection between blower fan and vavuum pump all can carry out the switching opened and close.
2. according to the device of claim 1, it is characterized in that, first order graphite polypropylene heat exchanger also can carry out the modulation be not connected with metallic recuperator.
3. according to the device of claim 1, it is characterized in that, metallic recuperator and first order graphite polypropylene heat exchanger adopt cooling water to cool, and second level graphite polypropylene heat exchanger is then connected with source pump and cools.
4. according to the device of claim 1, it is characterized in that, multistage NOx absorption system is multi-level gas absorption tower.
5. according to the device of claim 1, it is characterized in that, NOx adsorption plant, built with NOx adsorbent, is also provided with firing equipment in NOx adsorption plant simultaneously.
CN201420430431.7U 2014-07-31 2014-07-31 The device of a kind of gas fired-boiler exhaust heat-energy recovery and purification of nitrogen oxides Expired - Fee Related CN204127983U (en)

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