CN204962714U - Gas boiler ultra -low temperature waste heat recovery system of discharging fume - Google Patents
Gas boiler ultra -low temperature waste heat recovery system of discharging fume Download PDFInfo
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- CN204962714U CN204962714U CN201520683843.6U CN201520683843U CN204962714U CN 204962714 U CN204962714 U CN 204962714U CN 201520683843 U CN201520683843 U CN 201520683843U CN 204962714 U CN204962714 U CN 204962714U
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- gas
- flue gas
- low temperature
- oxygen
- boiler
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The utility model provides a gas boiler ultra -low temperature waste heat recovery system of discharging fume, includes low temperature gas gas heater, condenser, oxygen -eliminating device and the economizer that links to each other with the boiler, and the economizer is connected with air heater, and air heater links to each other with low temperature gas gas heater's flue gas entry, and low temperature gas gas heater's exhanst gas outlet is connected with the chimney through the draught fan, low temperature gas gas heater's water entry links to each other with the condenser, low temperature gas gas heater's water export links to each other with the economizer through the oxygen -eliminating device. The utility model discloses in through setting up low temperature gas gas heater, can be 145 DEG C high temperature flue gas with the temperature and fall through low temperature gas gas heater and be 60 DEG C flue gas for the temperature, abundant utilization the heat of flue gas to to send the oxygen -eliminating device to through the water after the heating of low temperature gas gas heater, reduce the consumption of oxygen -eliminating device crowning taste steam, in order to realize energy saving and emission reduction, the increase purpose of taping the latent power.
Description
Technical field
The utility model relates to the fields such as energy-saving and environmental protection, specifically a kind of gas fired-boiler cryogenic exhausting residual neat recovering system.
Background technology
There is 16, the boiler of dissimilar size Laigang, gross tonnage has 1920 tons/hour, reduce exhaust gas temperature to have great importance to raising energy utilization rate, for reclaiming heat lift boiler actual motion benefit further, reduce energy source and power factory exhaust gas temperature and promote boiler thermal output raising generated energy, it is 120 DEG C that current flue gas arranges temperature outward, recovery heat is few, cause great heat waste, by facts have proved, exhaust gas temperature often reduces by 15 DEG C of boiler hot benefits and improves about 1%.Therefore, improve the utilization of residual heat from boiler fume, reduce exhaust gas temperature to the effective utilization improving the energy, improve generated energy and have great importance.
From each links of aspect baking oven boiler operatiopn such as technology, benefit, safety, in conjunction with actual condition, how flue-gas temperature is reduced to about 60 DEG C or lower from initial temperature about 145 DEG C, recovery heat increases, this part heat of abundant recycling, but too much reduce flue-gas temperature, heavy corrosion can be caused to flue and rear portion equipment, therefore need to solve, for responding country's " energy-saving and emission-reduction " and " cascaded utilization of energy " policy, final setting target is 60 DEG C of rows outward, fully effectively can improve the thermal efficiency of boiler, reduce the discharge of carbon dioxide.
Utility model content
For solving the problems of the prior art, the purpose of this utility model is to provide a kind of gas fired-boiler cryogenic exhausting residual neat recovering system, better can reclaim heat, makes heat obtain efficient utilization.
For achieving the above object, the technical scheme that the utility model adopts is:
A kind of gas fired-boiler cryogenic exhausting residual neat recovering system, the economizer comprising low-temperature flue gas heat exchanger, condenser, oxygen-eliminating device and be connected with boiler, economizer is connected with air preheater, air preheater is connected with the smoke inlet of low-temperature flue gas heat exchanger, and the exhanst gas outlet of low-temperature flue gas heat exchanger is connected with chimney by air-introduced machine; The water inlet of described low-temperature flue gas heat exchanger is connected with condenser, and the water out of described low-temperature flue gas heat exchanger is connected with economizer through oxygen-eliminating device.
Condensate pump is provided with between the water inlet of described low-temperature flue gas heat exchanger and condenser.
The first valve is provided with between the water inlet of described low-temperature flue gas heat exchanger and condensate pump.
Described condensate water delivery side of pump is also connected with oxygen-eliminating device.
The second valve is provided with between described condensate water delivery side of pump and oxygen-eliminating device.
Feed pump is provided with between described oxygen-eliminating device and economizer.
Described low-temperature flue gas heat exchanger is provided with drain valve.
The 3rd valve is provided with between the water out of described low-temperature flue gas heat exchanger and oxygen-eliminating device.
Compared with prior art, the beneficial effect that the utility model has is: in prior art during unit operation, condensate water from condenser directly enters oxygen-eliminating device, because feedwater temperature before entering oxygen-eliminating device is lower, in order to obtain good feedwater deaeration effect, the steam consumption of oxygen-eliminating device is inevitable comparatively large, so need larger heat to heat the water in oxygen-eliminating device.And by arranging low-temperature flue gas heat exchanger in the utility model, can be that the high-temperature flue gas of 145 DEG C reduces to through low-temperature flue gas heat exchanger the flue gas that temperature is 60 DEG C by temperature, fully reclaim the heat of flue gas, water after the heating of low-temperature flue gas heat exchanger is delivered to oxygen-eliminating device, reduce the consumption of GOOD TASTE steam in oxygen-eliminating device, to realize energy-saving and emission-reduction, enhancing efficiency by relying on tapping internal latent power object.After adopting this recovery system, waste heat recovery economic benefits.
Further, the condensate water that flue gas produces after the cooling of low-temperature flue gas heat exchanger is exported by the drain valve be arranged on low-temperature flue gas heat exchanger, avoids the corrosion that condensate water middle acid substance causes air-introduced machine and chimney.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Wherein, 1 is boiler, and 2 is economizer, and 3 is air preheater, and 4 is low-temperature flue gas heat exchanger, and 5 is air-introduced machine, and 6 is chimney, and 7 is feed pump, and 8 is oxygen-eliminating device, and 9 is condenser, and 10 is condensate pump, and 11 is the first valve, and 12 is the second valve, and 13 is the 3rd valve.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is described in further details:
See Fig. 1, gas fired-boiler cryogenic exhausting residual neat recovering system of the present utility model, the economizer 2 comprising low-temperature flue gas heat exchanger 4, condenser 9, oxygen-eliminating device 8 and be connected with boiler 1, economizer 2 is connected with air preheater 3, air preheater 3 is connected with the smoke inlet of low-temperature flue gas heat exchanger 4, and the exhanst gas outlet of low-temperature flue gas heat exchanger 4 is connected with chimney 6 by air-introduced machine 5; Water in described low-temperature flue gas heat exchanger 4 is from condenser 9, condenser 9 is connected with the water inlet of low-temperature flue gas heat exchanger 4 through condensate pump 10, first valve 11, concrete, the outlet of condensate pump 10 divides two-way, one tunnel first valve 11 is connected with the water inlet of low-temperature flue gas heat exchanger 4, and another road second valve 12 is connected with oxygen-eliminating device 8; The water out of described low-temperature flue gas heat exchanger 4 is connected with economizer 2 through the 3rd valve 13, oxygen-eliminating device 8, feed pump 7.
Gas fired-boiler cryogenic exhausting waste heat reclaiming process based on above-mentioned recovery system: the high-temperature flue gas of 145 DEG C that boiler 1 produces is after economizer 2, air preheater 3,60 DEG C are reduced to through low-temperature flue gas heat exchanger 4, hydromining in low-temperature flue gas heat exchanger 4 is used for from the condensate water of condenser 9, water after low-temperature flue gas heat exchanger 4 heats delivers to oxygen-eliminating device 8, reduces the consumption of oxygen-eliminating device 8 pairs of GOOD TASTE steam; The condensate water that flue gas produces after low-temperature flue gas heat exchanger 4 is lowered the temperature is exported by the drain valve be arranged on low-temperature flue gas heat exchanger 4, avoids the corrosion that condensate water middle acid substance causes air-introduced machine and chimney; Add corrosion inhibiter in high temperature section pipeline simultaneously between air preheater 3 and low-temperature flue gas heat exchanger 4, prevent low-temperature flue gas from causing corrosion to pipeline and equipment, the flue gas after low-temperature flue gas heat exchanger 4 is lowered the temperature is discharged from chimney 6 through air-introduced machine 5.
Corrosion inhibiter in the utility model obtains by the following method:
1) by mass percentage, by the water of 15 ~ 25%, 10 ~ 20% polyoxyethylene sorbitan fatty acid ester, the sorbitan fatty acid fat of 5 ~ 10%, the alkylamine of 12 ~ 18 carbon atoms of 50 ~ 60% add in reactor, be warming up to 50 ~ 55 DEG C and stir 1 ~ 1.5h, naturally cool to room temperature after homogeneous, obtain intermediate product; Wherein, the alkylamine of described 12 ~ 18 carbon atoms is one or more arbitrary proportion mixtures in tridecyl amine, tetradecylamine, cetylamine, hexadecane diamines, trihexylamine, dioctylamine.
2) by mass percentage, by the BTA of 10 ~ 30%, the trien of 20 ~ 30% and 40 ~ 70% intermediate product add in reactor, then back flow reaction 0.5 ~ 1h at 40 ~ 50 DEG C, obtains corrosion inhibiter.
At present, during unit operation, the condensate water from condenser directly enters oxygen-eliminating device, and because feedwater temperature before entering oxygen-eliminating device is lower, in order to obtain good feedwater deaeration effect, the steam consumption of oxygen-eliminating device is inevitable larger; And by arranging UTILIZATION OF VESIDUAL HEAT IN heat-exchanger rig and low-temperature flue gas heat exchanger 4 at flue afterbody in the utility model, the condensate water of hydromining in low-temperature flue gas heat exchanger 4 from steam turbine, water after heating delivers to oxygen-eliminating device, reduce the consumption of GOOD TASTE steam in oxygen-eliminating device, to realize energy-saving and emission-reduction, enhancing efficiency by relying on tapping internal latent power object.
Below to produce, carry out simple waste heat recovery performance analysis:
With 130 tons of boilers, run 8000h and calculate, steam exit pressure 3.83MPa, steam exit temperature 450 DEG C, flue-gas temperature 145 DEG C, after afterheat heat exchanger, draft flue gas and arrange temperature outward: 60 DEG C, flue gas thermal discharge:
Q
1＝0.985×(342.8-137.1)×115200/3600＝6582.4kW
Q
1-flue gas is reduced to the heat of 45 DEG C of releases per hour from 145 DEG C;
Wherein: the heat insulating coefficient of boiler is got: 98.5%
Unit Nm
3the enthalpy of the flue gas that fuel produces at 145 DEG C: 342.8kJ/Nm
3
Unit Nm
3the enthalpy of the flue gas that fuel produces at 60 DEG C: 137.1kJ/Nm
3
Time at full capacity, boiler calculation Fuel Consumption is (reduced value): 115200Nm
3/ h
Q
2＝(0.0527×115200×18/22.4×(2674.95-417.44)/3600)×0.2＝611.85kW
Q
2-flue gas is reduced to steam 45 DEG C of processes from 145 DEG C and changes the heat of aqueous water (phase in version) release per hour into;
Wherein: condensed water conversion ratio: 0.2 (this numerical value needs test determination);
Unit flue gas changes into the share 0.0527Nm of steam
3/ Nm
3;
(2674.95-417.44) be the latent heat of vaporization of every kg water of normal atmosphere pressure, unit kJ/kg;
18/22.4, the density of water vapour under normal pressure mark state, units/kg/Nm
3;
The total amount of heat Q=Q of release per hour in flue gas cool-down process
1+ Q
2=6582.4+611.85=7194.25kW
Annual recovery heat (GJ): (7194.25kW × 3600 × 8000)/1000000=207191.4GJ/
Being folded to boiler ton steam is:
207191.4GJ/ year/130t/h=1593.78GJ//t/h
Steel mill produces steam 1244t/h (real data in 2014), calculates according to 40 yuan/GJ, and employing waste heat recovery benefit is:
1244t/h × 1593.78GJ//t/h × 40 yuan/GJ/10000=7930.65 ten thousand yuan/year
Increase cost
Because flue-gas temperature reduces, be reduced to 60 DEG C of air quantity by 145 DEG C and reduce about 50%, the minimizing of exhaust gas volumn counteracts the resistance increasing heat exchanger and bring, and the energy consumption of blower fan decreases, 130 tons of boilers increase corrosion inhibiter cost 500,000 yuan/year, and the cost that being folded to boiler ton steam increases is:
500000 yuan/year/130t/h=0.345, ten thousand yuan/year/t/h
The common 1244t/h in Laigang need increase direct cost and be:
0.345 ten thousand yuan/year/t/h × 1244t/h=429.2 ten thousand yuan/year
Direct economic benefit is:
7930.25 ten thousand yuan/year-429.2 ten thousand yuan/year=7501.05 ten thousand yuan/year
Visible, gas fired-boiler cryogenic exhausting residual neat recovering system in the utility model can be good at heat in recovered flue gas, waste heat recovery benefit describes fully, the feasibility of this recovery process and economic benefit, achieves and realizes energy-saving and emission-reduction, enhancing efficiency by relying on tapping internal latent power object.
Claims (8)
1. a gas fired-boiler cryogenic exhausting residual neat recovering system, it is characterized in that, the economizer (2) comprising low-temperature flue gas heat exchanger (4), condenser (9), oxygen-eliminating device (8) and be connected with boiler (1), economizer (2) is connected with air preheater (3), air preheater (3) is connected with the smoke inlet of low-temperature flue gas heat exchanger (4), and the exhanst gas outlet of low-temperature flue gas heat exchanger (4) is connected with chimney (6) by air-introduced machine (5); The water inlet of described low-temperature flue gas heat exchanger (4) is connected with condenser (9), and the water out of described low-temperature flue gas heat exchanger (4) is connected with economizer (2) through oxygen-eliminating device (8).
2. a kind of gas fired-boiler cryogenic exhausting residual neat recovering system according to claim 1, is characterized in that, is provided with condensate pump (10) between the water inlet of described low-temperature flue gas heat exchanger (4) and condenser (9).
3. a kind of gas fired-boiler cryogenic exhausting residual neat recovering system according to claim 1, it is characterized in that, between the water inlet of described low-temperature flue gas heat exchanger (4) and condensate pump (10), be provided with the first valve (11).
4. a kind of gas fired-boiler cryogenic exhausting residual neat recovering system according to claim 2, is characterized in that, the outlet of described condensate pump (10) is also connected with oxygen-eliminating device (8).
5. a kind of gas fired-boiler cryogenic exhausting residual neat recovering system according to claim 3, is characterized in that, is provided with the second valve (12) between the outlet of described condensate pump (10) and oxygen-eliminating device (8).
6. a kind of gas fired-boiler cryogenic exhausting residual neat recovering system according to claim 1, is characterized in that, be provided with feed pump (7) between described oxygen-eliminating device (8) and economizer (2).
7. a kind of gas fired-boiler cryogenic exhausting residual neat recovering system according to claim 1, is characterized in that, described low-temperature flue gas heat exchanger (4) is provided with drain valve.
8. a kind of gas fired-boiler cryogenic exhausting residual neat recovering system according to claim 1, is characterized in that, is provided with the 3rd valve (13) between the water out of described low-temperature flue gas heat exchanger (4) and oxygen-eliminating device (8).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520683843.6U CN204962714U (en) | 2015-09-06 | 2015-09-06 | Gas boiler ultra -low temperature waste heat recovery system of discharging fume |
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|---|---|---|---|
| CN201520683843.6U CN204962714U (en) | 2015-09-06 | 2015-09-06 | Gas boiler ultra -low temperature waste heat recovery system of discharging fume |
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| CN204962714U true CN204962714U (en) | 2016-01-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105546513A (en) * | 2016-02-05 | 2016-05-04 | 无锡市沈能节能锅炉股份有限公司 | Steam-gas boiler and assembly for deep recovery of exhaust heat |
-
2015
- 2015-09-06 CN CN201520683843.6U patent/CN204962714U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105546513A (en) * | 2016-02-05 | 2016-05-04 | 无锡市沈能节能锅炉股份有限公司 | Steam-gas boiler and assembly for deep recovery of exhaust heat |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Room 32305, unit 3, building 1, Gaoxin Danfeng International, Gaoxin 4th Road, Gaoxin District, Xi'an City, Shaanxi Province, 710075 Patentee after: Shaanxi Yuteng energy and Environmental Protection Technology Co.,Ltd. Address before: Room 32305, unit 3, building 1, Gaoxin Danfeng International, Gaoxin 4th Road, Gaoxin District, Xi'an City, Shaanxi Province, 710075 Patentee before: SHAANXI YUTENG INDUSTRY Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CP02 | Change in the address of a patent holder |
Address after: 710018 room 604, floor 6, Zhonggang International Building B, Wenjing Road, Xi'an Economic and Technological Development Zone, Shaanxi Province Patentee after: Shaanxi Yuteng energy and Environmental Protection Technology Co.,Ltd. Address before: Room 32305, unit 3, building 1, Gaoxin Danfeng International, Gaoxin 4th Road, Gaoxin District, Xi'an City, Shaanxi Province, 710075 Patentee before: Shaanxi Yuteng energy and Environmental Protection Technology Co.,Ltd. |
|
| CP02 | Change in the address of a patent holder |