CN103418220A - Gas-fired boiler (direct-fired machine) flue-gas waste heat recovery device integrating functions of denitration and water collection - Google Patents
Gas-fired boiler (direct-fired machine) flue-gas waste heat recovery device integrating functions of denitration and water collection Download PDFInfo
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- CN103418220A CN103418220A CN2012101568249A CN201210156824A CN103418220A CN 103418220 A CN103418220 A CN 103418220A CN 2012101568249 A CN2012101568249 A CN 2012101568249A CN 201210156824 A CN201210156824 A CN 201210156824A CN 103418220 A CN103418220 A CN 103418220A
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Abstract
The invention provides a gas-fired boiler (a direct-fired machine) flue-gas waste heat recovery device integrating functions of denitration and water collection, and especially a gas-fired boiler flue-gas waste heat recovery device capable of removing nitric oxides in flue gas by employing a method comprising ozonation and alkali-liquid absorption. According to the device of the invention, an ozonator, a spraying chamber, an alkali-liquid sprayer and the like are increased based on a conventional gas-fired boiler (the direct-fired machine) flue-gas waste heat recovery device. During flue gas waste heat recovery by using the gas-fired boiler (the direct-fired machine), ozone is added to the flue gas, so that nitric oxide in the flue gas is oxidized into nitrogen dioxide and other high valent nitric oxides, and the nitric oxides are absorbed by a sprayed alkali liquid, so that denitration is realized. The final flue discharged temperature is reduced to a normal temperature, and the vast majority of vapor in the flue gas is congealed into water which can be recovered in abundance for production and life, so that water-saving effect is substantial. Because of economic benefit and water-saving benefit generated by the gas-fired boiler (the direct-fired machine) flue-gas waste heat recovery device, and because of recovery of nitrate products, the investment and operating cost of the gas-fired boiler (the direct-fired machine) flue-gas waste heat recovery device are reduced. An energy saving and emission reduction technology with low investment, low operating cost and high efficiency is provided.
Description
Technical field
The present invention relates to a kind of gas fired-boiler (Central Air-Conditioner) flue gas waste heat recovery apparatus, particularly can remove gas fired-boiler (Central Air-Conditioner) flue gas waste heat recovery apparatus of condensed water (catchmenting) in nitrogen oxides in effluent (denitration) and collection flue gas.
Background technology
The main component of natural gas is methane, produces carbon dioxide and water during burning, so contains a large amount of steam in the flue gas of gas fired-boiler (Central Air-Conditioner) discharge, accounts for 20% left and right of flue gas volume.The gas fired-boiler exhaust gas temperature is higher than 120 ℃ at present, and a large amount of latent heat and water are discharged into aerial and waste.Existing more ripe flue gas waste heat recovery technology can only drop to flue gas more than 60 ℃, and most latent heat and water can not be recycled.
Gas fired-boiler (Central Air-Conditioner) produces nitrogen oxide and pollutes in atmosphere with fume emission when burning.Although the nitrogen oxide qualified discharge of single boiler (Central Air-Conditioner), along with the quantity increase of gas fired-boiler (Central Air-Conditioner), its total amount that is discharged into aerial nitrogen oxide, also increasing, will produce on the air quality of specific region certain impact.Because the content of gas fired-boiler (Central Air-Conditioner) nitrogen oxides in effluent is relatively low, the investment and the running cost that increase denitration device are relatively high.Therefore need the low input of exploitation, low operating cost, the out of stock technology of high efficiency gas fired-boiler (Central Air-Conditioner) flue gas.
" a kind of smoke waste heat all recovering device for gas boiler " utility model patent that open application number is 201110282736.4 discloses a kind of gas fired-boiler flue gas waste heat recovery apparatus, this patented technology can be in Mist heat recovering, utilize the water-soluble characteristic of nitrogen dioxide, can remove part nitrogen oxide in flue gas.But because the main component of the nitrogen oxide in flue gas is carbon monoxide, be insoluble in water, therefore, the clearance of nitrogen oxide is lower.
In order to improve the clearance of nitrogen oxide, " ozone oxidation and denitration method of boiler flue gas " patent of invention that application number is 200510061120.3 has been announced a kind of oxidation absorption process, utilizing ozone is the contour valence state nitrogen oxide of nitrogen dioxide by water-fast oxidation of nitric oxide, pass through again spray-absorption, the method is not suitable for the lower flue gases of amount of nitrogen oxides such as gas fired-boiler, be not suitable for the flue gas below 110 ℃ yet, need to drop into special oxidation spray-absorption equipment, equipment investment and operating cost are also higher simultaneously.
Summary of the invention
The problem existed for background technology, the invention provides a kind of gas fired-boiler (Central Air-Conditioner) flue gas waste heat recovery apparatus with denitration and water collecting function, particularly adopt the method for ozone oxidation, alkali liquor absorption by the gas fired-boiler flue gas waste heat recovery apparatus of the removal of nitrogen oxide in flue gas.
A kind of gas fired-boiler (Central Air-Conditioner) flue gas waste heat recovery apparatus with denitration and water collecting function the present invention relates to comprises: introduce air channel 1, air-introduced machine 2, ozone generator 3, plate type heat exchanger 4, hybrid cooling device 5, evaporator with heat pump 6, alkali lye spray thrower 7, condensate collector 8, spray chamber 9, draw air channel 10, boiler chimney 11.
The present invention is achieved in that
Boiler smoke adds ozone by ozone generator when air-introduced machine 2 enters introducing air channel 1, and the nitric oxide in flue gas is oxidized to the high price nitrogen oxide such as nitrogen dioxide.Flue gas can produce condensed water through plate type heat exchanger 4 temperature-fall periods, can dissolve part nitrogen dioxide.The characteristic that solubility according to nitrogen dioxide in akaline liquid is higher, spray into akaline liquid in spray chamber 8, flue gas enters spray chamber 8 and fully contacts with alkali lye after 5 coolings of hybrid cooling device, and most of nitrogen dioxide is dissolved in alkali lye, and alkali lye can be recycled.After flue gas is further lowered the temperature by evaporator with heat pump 6, a part is discharged, again entering spray chamber 8 after another part enters again hybrid cooling device 5 and high-temperature flue gas from plate type heat exchanger 4 mixes lowers the temperature by evaporator with heat pump, nitrogen dioxide is further by alkali liquor absorption, owing to repeatedly contacting with alkali lye, improved the clearance of nitrogen dioxide.The condensed water that flue gas produces in by plate type heat exchanger 4 and evaporator with heat pump 6 twice temperature-fall period by condensate collector 8, collected after centralized stores, carry out advanced treating according to different purposes.
This patent is to increase oxidation and spray-absorption function and realize denitration, the technology of catchmenting on the basis of original gas fired-boiler flue gas waste heat recovery apparatus, and therefore, the equipment investment expense increased with catchmenting for denitration is relative less.Due to the nitrogen oxide in flue gas, by alkali liquor absorption, the condensed water that the flue gas cool-down process produces approaches pure water, has reduced the expense of follow-up water treatment.
The present invention adapts to the low-temperature flue gas below 110 ℃, the exhaust gas temperature of gas fired-boiler can be dropped to normal temperature, most of heat (comprising latent heat) that combustion of natural gas produces is recycled, and the economic benefit of its generation is enough to offset the expense of ozone generator and spray equipment consumption electric energy; Alkali lye forms nitrate absorb nitrogen dioxide in spray chamber after, can carry out concentration and produce the nitrate product when nitrate reaches finite concentration, and alkali lye itself, from the condensed water of flue gas, can recycle.Because final exhaust gas temperature is reduced to normal temperature, the steam overwhelming majority in flue gas condenses into water, and therefore, recyclable a large amount of water is back to production, life, and water-saving result is remarkable.
The accompanying drawing explanation
The schematic diagram that accompanying drawing 1 is technological process of the present invention (circulating)
The schematic diagram that accompanying drawing 2 is technological process of the present invention (single flow)
In figure:
1, introduce air channel 2, air-introduced machine 3, ozone generator 4, plate type heat exchanger
5, hybrid cooling device 6, evaporator with heat pump 7, alkali lye spray thrower, 8 condensate collectors
9 spray chambers 10 are drawn air channel 11 boiler chimneys
The specific embodiment
Nitrogen oxide in the gas fired-boiler flue gas (being mainly nitric oxide and nitrogen dioxide), that airborne nitrogen produces under the condition of gas fired-boiler high-temp combustion, mainly with nitric oxide production form, exist, account for more than 90% of nitrogen oxide, be insoluble in water, easily be oxidized to the high price nitrogen oxide such as nitrogen dioxide.And nitrogen dioxide is water-soluble and alkali lye.According to this characteristic, in the flow process of flue gas waste heat recovery, adding has increased oxidant and has added and two links of spray-absorption, makes flue gas waste heat recovery apparatus become denitrification apparatus.Because the steam in flue gas condenses into water in the flue gas cool-down process, be faintly acid after absorption portion nitrogen dioxide and carbon dioxide, the alkali lye of spray chamber ejection is strong basicity, so the plate type heat exchanger of this device, evaporator with heat pump and the material that contacts with condensed water, alkali lye with flue all adopt stainless steel or resistant material.
According to the flow direction of flue gas in technological process and the difference of temperature and flow, be divided into reverse-flow type and single flow.
Embodiment 1:
The present embodiment is the reverse-flow type system, be applicable to the operating mode that exhaust gas temperature is higher, after having part need be back to hybrid cooling device 5 and flue gas from plate type heat exchanger 4 mixes, the flue gas of evaporator with heat pump 6 cooling lowers the temperature, again enter spray chamber 8 and absorb denitration, can obtain denitration effect preferably.
As shown in Figure 1:
Boiler smoke is extracted into and is introduced air channel 1 by blower fan 2, before entering plate type heat exchanger 4, adds ozone, by the oxidation of nitric oxide in flue gas, is nitrogen dioxide, during flue gas process plate type heat exchanger 4, can produce condensed water, dissolves part nitrogen dioxide.Flue gas temperature after plate type heat exchanger drops to 50 ℃ of left and right, mix with the low-temperature flue gas that carrys out flash-pot 4 and drop to 30 ℃ of left and right, by spray chamber, with alkali lye, fully contact, be cooled to 25 ℃ of left and right through evaporator with heat pump, smoke backflow after the part cooling is to the hybrid cooling chamber, and another part flue gas enters atmosphere.Final exhaust gas temperature can be regulated along with the load variations of boiler and the flow of introducing flue gas, to guarantee that air source heat pump is in the operation of efficient district.
Embodiment 2:
The present embodiment is direct air system, be applicable to the operating mode that exhaust gas temperature is lower, flue gas through plate type heat exchanger 4 directly enters spray chamber 8 absorption denitrations, then through evaporator with heat pump 6 coolings, as higher as exhaust gas temperature, the multistage absorption cooling can be set, both reduce exhaust gas temperature, can improve again the effect of denitration.
As shown in Figure 2:
Boiler smoke is extracted into and is introduced air channel 1 by blower fan 2, before entering plate type heat exchanger 4, adds ozone, by the oxidation of nitric oxide in flue gas, is nitrogen dioxide, during flue gas process plate type heat exchanger 4, can produce condensed water, dissolves part nitrogen dioxide.Flue gas temperature after plate type heat exchanger drops to below 40 ℃, the multistage absorption cooling can be set flue-gas temperature is dropped to 20 ℃ of left and right, finally enters atmosphere.By multistage spray-absorption, can reach denitration effect preferably.
Above embodiment and accompanying drawing thereof have only meaned the facade layout of patent device, and the horizontal layout of its evaporator with heat pump can be made parallel connection or series connection and polygon and circular arrangement.
Claims (7)
1. gas fired-boiler (Central Air-Conditioner) flue gas waste heat recovery apparatus with denitration and water collecting function, comprise: introduce air channel 1, air-introduced machine 2, ozone generator 3, plate type heat exchanger 4, hybrid cooling device 5, evaporator with heat pump 6, alkali lye spray thrower 7, condensate collector 8, spray chamber 9, draw air channel 10, boiler chimney 11, it is characterized in that being applicable to the low-temperature flue gas below 110 ℃, add ozone in flue gas in gas fired-boiler (Central Air-Conditioner) flue gas waste heat recovery technological process, by high price nitrogen oxide such as the oxidation of nitric oxide in flue gas are nitrogen dioxide, by the spray alkali lye by nox adsorption, realize the effect of denitration, flue gas is through plate type heat exchanger 4 and evaporator with heat pump 6 two-stage coolings, and final exhaust temperature is reduced to normal temperature, and the steam major part in flue gas condenses into water and focuses on reuse through condensate collector.
2. gas fired-boiler (Central Air-Conditioner) flue gas waste heat recovery apparatus with denitration function according to claim 1, is characterized in that, before the plate type heat exchanger 4 in introducing air channel 1, ozone generator 3 is housed, and in flue gas, adds ozone.
3. gas fired-boiler (Central Air-Conditioner) flue gas waste heat recovery apparatus with denitration function according to claim 1, it is characterized in that being provided with spray chamber before evaporator with heat pump 6, spray alkali lye and it is fully contacted with the flue gas that enters evaporimeter 6 by spray chamber by the alkali lye spray thrower, alkali lye can be recycled.
4. gas fired-boiler (Central Air-Conditioner) flue gas waste heat recovery apparatus with denitration function according to claim 1, it is characterized in that the flue gas of return-flow system is after evaporator with heat pump 6 coolings, a part is discharged, a part is back to hybrid cooling chamber 5 and flue gas hybrid cooling from plate type heat exchanger 4, enters alkali lye spray chamber 8 again by the evaporator with heat pump absorbing and cooling temperature.
5. gas fired-boiler (Central Air-Conditioner) flue gas waste heat recovery apparatus with denitration function according to claim 1, it is characterized in that at the flue gas of straight-flow system directly discharging or enter next stage alkali lye spray chamber 8 and evaporator with heat pump 6 absorbing and cooling temperatures after evaporator with heat pump 6 coolings.
6. gas fired-boiler (Central Air-Conditioner) flue gas waste heat recovery apparatus with denitration function according to claim 1, it is characterized in that being provided with condensate collector in the bottom of plate type heat exchanger and evaporator with heat pump reuse after further processing after the condensation water collection that flue gas cool-down is produced.
7. gas fired-boiler (Central Air-Conditioner) flue gas waste heat recovery apparatus with denitration function according to claim 1, is characterized in that the layout of its evaporator with heat pump 6 can be series, parallel and polygon and circular arrangement.
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| CN2012101568249A CN103418220A (en) | 2012-05-21 | 2012-05-21 | Gas-fired boiler (direct-fired machine) flue-gas waste heat recovery device integrating functions of denitration and water collection |
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| CN2012101568249A CN103418220A (en) | 2012-05-21 | 2012-05-21 | Gas-fired boiler (direct-fired machine) flue-gas waste heat recovery device integrating functions of denitration and water collection |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104089283A (en) * | 2014-07-28 | 2014-10-08 | 北京华通兴远供热节能技术有限公司 | Gas boiler system |
| CN107179006A (en) * | 2017-07-14 | 2017-09-19 | 河南省德耀节能科技股份有限公司 | A kind of kiln system |
| CN107179005A (en) * | 2017-07-14 | 2017-09-19 | 河南省德耀节能科技股份有限公司 | A kind of kiln system for including exhaust treatment system |
| CN107185345A (en) * | 2017-07-14 | 2017-09-22 | 河南省德耀节能科技股份有限公司 | A kind of kiln tail gas treatment process and system |
| CN107213738A (en) * | 2017-07-14 | 2017-09-29 | 河南省德耀节能科技股份有限公司 | A kind of damp and hot tail gas treatment process and system |
| CN107314686A (en) * | 2017-07-14 | 2017-11-03 | 河南省德耀节能科技股份有限公司 | A kind of kiln exhaust gas treating method and system |
| CN109163477A (en) * | 2018-08-03 | 2019-01-08 | 西安交通大学 | A kind of absorption type heat pump system of gas fired-boiler fume afterheat and condensate-water polishing |
| CN109173679A (en) * | 2018-11-14 | 2019-01-11 | 冷应杰 | A kind of high efficiency industrial fumes energy-saving purifier |
| CN109210955A (en) * | 2018-10-19 | 2019-01-15 | 上海孚旺炉业有限公司 | A kind of industrial furnace low-temperature flue gas waste heat utilizes and desulfurization nitre eliminating white smoke integral system |
| CN109764695A (en) * | 2018-12-18 | 2019-05-17 | 西安交通大学 | A kind of condensing heat exchanger and method for gas fired-boiler denitrating flue gas |
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2012
- 2012-05-21 CN CN2012101568249A patent/CN103418220A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104089283A (en) * | 2014-07-28 | 2014-10-08 | 北京华通兴远供热节能技术有限公司 | Gas boiler system |
| CN107179006A (en) * | 2017-07-14 | 2017-09-19 | 河南省德耀节能科技股份有限公司 | A kind of kiln system |
| CN107179005A (en) * | 2017-07-14 | 2017-09-19 | 河南省德耀节能科技股份有限公司 | A kind of kiln system for including exhaust treatment system |
| CN107185345A (en) * | 2017-07-14 | 2017-09-22 | 河南省德耀节能科技股份有限公司 | A kind of kiln tail gas treatment process and system |
| CN107213738A (en) * | 2017-07-14 | 2017-09-29 | 河南省德耀节能科技股份有限公司 | A kind of damp and hot tail gas treatment process and system |
| CN107314686A (en) * | 2017-07-14 | 2017-11-03 | 河南省德耀节能科技股份有限公司 | A kind of kiln exhaust gas treating method and system |
| CN109163477A (en) * | 2018-08-03 | 2019-01-08 | 西安交通大学 | A kind of absorption type heat pump system of gas fired-boiler fume afterheat and condensate-water polishing |
| CN109210955A (en) * | 2018-10-19 | 2019-01-15 | 上海孚旺炉业有限公司 | A kind of industrial furnace low-temperature flue gas waste heat utilizes and desulfurization nitre eliminating white smoke integral system |
| CN109210955B (en) * | 2018-10-19 | 2024-03-26 | 上海孚旺炉业有限公司 | Industrial furnace low temperature flue gas waste heat utilization and SOx/NOx removal white smoke integrated system |
| CN109173679A (en) * | 2018-11-14 | 2019-01-11 | 冷应杰 | A kind of high efficiency industrial fumes energy-saving purifier |
| CN109764695A (en) * | 2018-12-18 | 2019-05-17 | 西安交通大学 | A kind of condensing heat exchanger and method for gas fired-boiler denitrating flue gas |
| CN109764695B (en) * | 2018-12-18 | 2021-01-19 | 西安交通大学 | Condensing heat exchanger and method for denitration of flue gas of gas-fired boiler |
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Application publication date: 20131204 |