CN217763455U - Waste sludge incineration flue gas waste heat recovery system - Google Patents
Waste sludge incineration flue gas waste heat recovery system Download PDFInfo
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- CN217763455U CN217763455U CN202221905233.2U CN202221905233U CN217763455U CN 217763455 U CN217763455 U CN 217763455U CN 202221905233 U CN202221905233 U CN 202221905233U CN 217763455 U CN217763455 U CN 217763455U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/12—Heat utilisation in combustion or incineration of waste
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Abstract
The utility model relates to a waste sludge incineration flue gas waste heat recovery especially relates to a waste sludge incineration flue gas waste heat recovery system. The utility model provides a waste sludge incineration flue gas waste heat recovery system, includes: the gas-gas heat exchanger with high temperature and high humidity flue gas side and low temperature and low humidity flue gas side for with the flue gas input pipeline of high temperature and high humidity flue gas input high temperature and high humidity flue gas side, be used for with the flue gas output pipeline of low temperature and low humidity flue gas discharge low temperature and low humidity flue gas side, have the gas water heat transfer portion of flue gas side and waste heat water side, connect waste heat water input tube and waste heat water output tube of waste heat water side, the both ends of flue gas side communicate high temperature and high humidity flue gas side and low temperature and low humidity flue gas side respectively. The utility model discloses a main beneficial effect is: the temperature of the discharged flue gas of the waste sludge incineration power generation boiler is reduced to be lower than the dew point temperature of the waste sludge incineration power generation boiler from about 150 ℃, the temperature can be reduced to be lower than 30 ℃, the latent heat rich in the flue gas is efficiently and deeply recovered, the thermal efficiency of the waste incineration boiler is improved, and the enterprise income is increased.
Description
Technical Field
The utility model relates to a waste sludge burns flue gas waste heat recovery, especially relates to a waste sludge burns flue gas waste heat recovery system.
Background
The garbage incineration power generation is a power generation form that municipal solid garbage and sludge are combusted through a special incineration boiler and then a steam turbine generator set is used for generating power. At present, domestic waste incineration power plants in China exceed 500 families, and the treatment mode has the advantages of small occupied area, high waste reduction and stabilization harmless degree, high energy utilization rate, low secondary pollution degree and the like, so that the waste incineration industry develops rapidly, and the method becomes a domestic waste treatment method which is applied more generally at home and abroad at present.
For a waste incineration boiler, the heat loss of exhaust smoke is the main heat loss of the waste incineration boiler, generally 12% -18%, under the condition of a certain excess air coefficient, the exhaust smoke loss gradually increases along with the increase of the exhaust smoke temperature, and the heat loss of the exhaust smoke correspondingly decreases (or increases) by about 0.9% when the exhaust smoke temperature decreases (or increases) by 10 ℃, so that the exhaust smoke temperature has a remarkable influence on the heat efficiency of the boiler.
The waste incineration boiler discharges flue gas, and has the characteristics of high temperature and high humidity. The temperature of the discharged flue gas of the waste incineration boiler is generally about 150 ℃, and some are even higher; the water content in the garbage in China is high (basically 40-60%), and the moisture content of the discharged flue gas is large (generally 15-40 v%) because the flue gas after the garbage incineration is treated by a series of purification systems. At present, flue gas generated by a waste incineration boiler is directly discharged to the atmosphere after being treated by a series of purification systems:
(1) The waste heat of the external exhaust gas is not recycled, and particularly, the flue gas has high moisture content and huge latent heat is wasted;
(2) High-temperature and high-humidity exhaust smoke brings away part of heat in boiler combustion, so that not only is environmental pollution caused, but also heat is wasted;
(3) The smoke with high water vapor content can easily form white smoke plume in the environment with lower environmental temperature in winter.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that overcome exist among the prior art not enough, provide a waste sludge incineration flue gas waste heat recovery system, research and development novel waste incineration power generation boiler arranges flue gas waste heat recovery energy-saving technical process route outward, overcomes the current waste of arranging flue gas waste heat outward, improves waste incineration boiler thermal efficiency, increases the income of enterprise. The process system for realizing efficient and deep recycling of the exhaust flue gas of the waste incineration power generation boiler is provided, the waste heat of the exhaust flue gas of the boiler is recycled, the process system not only can be used for heating of residents, agricultural greenhouses and urban domestic hot water, but also can be used for self-use, low-temperature power generation, refrigeration and the like of a power plant, and conditionally can store heat in non-heating seasons.
The utility model discloses a realize through following technical scheme:
the utility model provides a waste sludge incineration flue gas waste heat recovery system, includes: the gas-gas heat exchanger with high temperature and high humidity flue gas side and low temperature and low humidity flue gas side for with the flue gas input pipeline of high temperature and high humidity flue gas input high temperature and high humidity flue gas side, be used for with the flue gas output pipeline of low temperature and low humidity flue gas discharge low temperature and low humidity flue gas side, have the gas water heat transfer portion of flue gas side and waste heat water side, connect waste heat water input tube and waste heat water output tube of waste heat water side, the both ends of flue gas side communicate high temperature and high humidity flue gas side and low temperature and low humidity flue gas side respectively.
According to the technical scheme, the gas-gas heat exchanger is preferably a dividing wall type leakage-free gas-gas heat exchanger. The gas-gas heat exchanger (GGH) can be a leakage-free GGH, and the plate-type gas-gas heat exchanger which has high heat transfer efficiency, blockage resistance, easy ash removal, thorough ash removal and reliable long-period operation and is used for high-dust-content gas-phase medium heat exchange occasions is particularly adopted. For example, a plate-type gas-gas heat exchanger of chinese utility model with application number 201720340104.6 has the following advantages:
1. the heat transfer element adopts a corrugated plate, so that the heat transfer effect is good, the equipment structure is compact, and the size is small;
2. the flow passage has short stroke, and the effective soot blowing range of the soot blower can be ensured to be fully covered;
3. a medium A flow channel and a medium B flow channel are formed on two sides of the plate, wherein the medium B flow channel is a non-contact straight flow channel without a leeward surface and a stagnant flow area, can ensure no dust accumulation and blockage in a long period under the action of a soot blower, and is suitable for being used as a channel for a gas phase medium with high dust content or easy scale deposition, and the channel on the other side is suitable for being used as a channel for a gas phase medium with low dust content or difficult scale deposition, so that the heat transfer efficiency is ensured, and the long-period operation reliability is also ensured;
4. when the heat load is increased, 2 or more plate bundle modules can be considered to be arranged in parallel, when the heat transfer temperature is crossed, 2 or more plate bundle modules can be considered to be arranged in series, the implementation can be very convenient through the internal guide plate and the split-range partition plate, and the ash removal effect is not changed; if the gas-gas heat exchangers in the prior art need to realize the same function, a plurality of gas-gas heat exchangers are required to be arranged in parallel, a certain space is required to be arranged between every two gas-gas heat exchangers, the occupied area is large, and the arrangement of a pipeline and a soot blower is extremely complicated.
According to the above technical solution, preferably, the method further comprises: the smoke exhaust pipeline is respectively communicated with the smoke input pipeline and the smoke output pipeline, the smoke input pipeline is positioned at the upstream of the smoke output pipeline, and the smoke exhaust pipelines among the smoke input pipeline, the smoke output pipeline, the smoke input pipeline and the smoke output pipeline are respectively provided with a shutoff valve. The waste heat recovery system is arranged in a bypass pipeline mode, and can be switched with the current discharge mode at any time through the valve bank.
According to the technical scheme, the gas-water heat exchanging part is preferably a gas-water heat exchanger.
According to the above technical solution, preferably, the gas-water heat exchanging portion includes a gas-water heat exchanger and a heat pump, the high-temperature high-humidity flue gas side, the flue gas side of the gas-water heat exchanger, the flue gas side of the heat pump, and the low-temperature low-humidity flue gas side are sequentially communicated, and the waste heat water input pipe, the waste heat water side of the heat pump, the waste heat water side of the gas-water heat exchanger, and the waste heat water output pipe are sequentially communicated.
According to the technical scheme, preferably, the gas-water heat exchanger and the heat pump are respectively provided with a condensed water collecting device. The condensed water collecting device is used for collecting condensed water generated after the temperature of the flue gas is reduced in the gas-water heat exchanger and the heat pump.
The beneficial effects of the utility model are that:
1. the temperature of the discharged flue gas of the waste incineration power generation boiler is reduced to be below the dew point temperature from about 150 ℃, the temperature can be reduced to be below 30 ℃, the abundant latent heat of the flue gas is efficiently and deeply recovered, and the thermal efficiency of the waste incineration boiler is improved;
2. waste heat is recycled, enterprise benefits are increased, and economic benefits are remarkable;
3. the method has the advantages that the heat energy of the discharged flue gas of the waste incineration power generation boiler is recycled to generate economic benefit, the moisture content of the discharged flue gas is reduced, the moisture content is removed by nearly 90%, condensed water is recycled, and the condensed water can be used for waste incineration power plants and other purposes after being treated, so that water resources are saved;
4. in the process of condensing and cooling the discharged flue gas of the waste incineration power generation boiler, the amount of the flue gas is reduced by nearly 30 percent, namely the discharged flue gas to the atmosphere is reduced by nearly 30 percent, and the social benefit is obvious;
5. during the condensation and temperature reduction process of the discharged flue gas of the waste incineration power generation boiler, partial pollutants (such as smoke dust and SO) in the flue gas are further removed through the condensation effect of condensation x 、HCl、NO X Etc.), play the role of reducing emission, and have remarkable social benefit;
6. after deep cooling, the low-temperature and low-humidity flue gas is subjected to leakage-free GGH and then heated to improve the superheat degree, and finally is discharged through a chimney, so that the chimney is prevented from being corroded, and the flue gas is easier to diffuse after being discharged;
7. white smoke can be eliminated from the discharged smoke of the waste incineration power generation boiler all the year round.
Drawings
Fig. 1 shows a schematic system structure diagram of a first embodiment of the present invention.
Fig. 2 shows a schematic system structure according to a second embodiment of the present invention.
In the figure:
1. a chimney; 2. GGH; 3. a gas-water heat exchanger; 4. a heat pump; 5. a flue gas input pipeline; 6. a flue gas output pipeline; 7. a waste heat water input pipe; 8. a residual heat water output pipe; 9. and (4) a flue gas discharge pipeline.
F1, a valve 1; f2, a valve 2; f3, a valve 3;
a. discharging flue gas; b. returning waste hot water; c. supplying residual hot water; d. low temperature and low humidity flue gas.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and the best embodiment.
The first embodiment is as follows: the gas-gas heat exchanger GGH is arranged, high-temperature and high-humidity flue gas is utilized to heat the low-temperature and low-humidity flue gas which is deeply cooled through the GGH, the superheat degree of the low-temperature and low-humidity flue gas which is deeply cooled is improved, and then the low-temperature and low-humidity flue gas is sent to a chimney for discharging. The high-temperature and high-humidity flue gas after the initial cooling of the GGH is sent to a gas-water heat exchanger, and the residual heat of the flue gas is deeply recovered by utilizing residual heat water. The low-temperature low-humidity flue gas condensed and cooled by the residual heat water is sent to the GGH through the gas-water heat exchanger, the superheat degree of the low-temperature low-humidity flue gas is improved by utilizing the residual heat of the high-temperature high-humidity flue gas, and then the low-temperature low-humidity flue gas is sent to a chimney for discharging to finish a cycle.
As shown in fig. 1: the system is arranged in a bypass pipeline mode, and can be switched with the current direct discharging mode at any time through a first valve F1, a second valve F2 and a third valve F3.
The system operates to close the valve II F2, open the valve I F1 and the valve III F3.
High-temperature and high-humidity 'discharged flue gas a' from a waste incineration boiler and treated by a series of purification systems is sent into 'GGH 2'.
The low-temperature low-humidity flue gas d which is deeply cooled by the gas-water heat exchanger 3 is heated by the externally discharged flue gas a through the GGH 2.
The discharged flue gas a after the primary cooling of the GGH2 is condensed and cooled by the residual hot water return water b through the gas-water heat exchanger 3.
The heated residual hot water backwater b is externally supplied in the form of residual hot water supply c.
The deeply condensed and cooled low-temperature and low-humidity flue gas d enters the GGH2 and is heated by the high-temperature and high-humidity exhaust flue gas a, the superheat degree is improved, and then the flue gas is sent to the chimney 1 for exhaust.
Example two: the method is characterized in that a 'GGH' is arranged, high-temperature and high-humidity flue gas is utilized to heat low-temperature and low-humidity flue gas subjected to deep cooling through the 'GGH', the superheat degree of the low-temperature and low-humidity flue gas subjected to deep cooling is improved, and then the low-temperature and low-humidity flue gas is sent to a chimney for discharge. The high-temperature and high-humidity flue gas after the initial cooling of the GGH is sequentially sent into a gas-water heat exchanger and a heat pump, and the residual heat of the flue gas is deeply recovered by utilizing residual heat water. The residual heat water enters a heat pump and a gas-water heat exchanger in turn. The low-temperature and low-humidity flue gas condensed and cooled by the residual heat water is sequentially sent to the 'gas-water heat exchanger' and the 'heat pump', the 'GGH' is sent to the 'GGH', the superheat degree of the flue gas is improved by the residual heat of the high-temperature and high-humidity flue gas, and then the flue gas is sent to the chimney to be discharged outside, so that a cycle is completed.
As shown in fig. 2: the system is arranged in a bypass pipeline mode, and can be switched with the current direct-discharging mode at any time through a first valve F1, a second valve F2 and a third valve F3.
Compared with the first embodiment, the system is additionally provided with a heat pump.
The system operates to close the valve II F2, open the valve I F1 and the valve III F3.
The high-temperature and high-humidity discharged flue gas a from the waste incineration boiler and treated by the series of purification systems is sent into GGH 2.
The low-temperature low-humidity flue gas d which is deeply cooled by the gas-water heat exchanger 3 is heated by the externally discharged flue gas a through the GGH 2.
The discharged flue gas a after the primary cooling of the GGH2 is condensed and cooled by the residual hot water backwater b sequentially through the gas-water heat exchanger 3 and the heat pump 4.
The waste heat water return b is sequentially fed through the heat pump 4 and the gas-water heat exchanger 3, and the heated waste heat water return b is externally supplied in a waste heat water supply c mode.
The deeply condensed and cooled low-temperature and low-humidity flue gas d enters the GGH2 to be heated by the high-temperature and high-humidity externally discharged flue gas a, the superheat degree is improved, and the flue gas d is sent to the chimney 1 to be discharged.
The beneficial effects of the utility model are that:
1. the temperature of the discharged flue gas of the waste incineration power generation boiler is reduced to be below the dew point temperature from about 150 ℃, the temperature can be reduced to be below 30 ℃, the abundant latent heat of the flue gas is efficiently and deeply recovered, and the thermal efficiency of the waste incineration boiler is improved;
2. waste heat is recycled, enterprise benefits are increased, and economic benefits are remarkable;
3. the method has the advantages that the heat energy of the discharged flue gas of the waste incineration power generation boiler is recycled to generate economic benefit, simultaneously, the moisture content of the discharged flue gas is reduced, the moisture content is removed by nearly 90%, condensed water is recycled, and the condensed water can be used for waste incineration power plants and other purposes after being treated, so that water resources are saved;
4. in the condensation and temperature reduction process of the discharged flue gas of the waste incineration power generation boiler, the amount of the flue gas is reduced by nearly 30 percent, namely the discharged amount to the atmosphere is reduced by nearly 30 percent, and the social benefit is obvious;
5. in the process of condensing and cooling the discharged flue gas of the waste incineration power generation boiler, partial pollutants (such as smoke dust, SOx, HCl, NOX and the like) in the flue gas are further removed through the condensation effect of condensation, so that the effect of emission reduction is achieved, and the social benefit is remarkable;
6. after deep cooling, the low-temperature and low-humidity flue gas is subjected to leakage-free GGH and then heated to improve the superheat degree, and finally is discharged through a chimney, so that the chimney is prevented from being corroded, and the flue gas is easier to diffuse after being discharged;
7. white smoke can be eliminated from the discharged smoke of the waste incineration power generation boiler all the year round.
A waste incineration power plant with a daily treatment capacity of 1000t/d and a power generation capacity of 25MW is designed as an example for explanation:
it is known that: the local atmospheric pressure is 101.325kPa, the smoke temperature is 150 ℃, the smoke discharge amount is 12 ten thousand Nm < 3 >/h, the smoke moisture content is 30 percent, the dew point temperature is 70 ℃, and the temperature is reduced to 30 ℃;
1. recovering waste heat of 21MW;
2. can bear about 50 ten thousand square meters of heating area;
3. discharged flue gas volume is 8.7 ten thousand Nm 3 The discharged flue gas amount is reduced by 27%;
4. the moisture content of the discharged flue gas is 4.19 percent, the condensate water is recycled by 26.12t/h, and the removal rate of the moisture content of the discharged flue gas is 89.85 percent;
5. after the temperature is reduced to 30 ℃, the temperature is raised to 70 ℃ and the relative humidity is 13.6 percent, the superheat degree is greatly improved, and the diffusion is easier after the discharge.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. The utility model provides a waste sludge incineration flue gas waste heat recovery system which characterized in that includes: gas-gas heat exchanger with humid tropical flue gas side and low temperature low humidity flue gas side, intercommunication the flue gas input pipeline of humid tropical flue gas side, intercommunication the flue gas output pipeline of low temperature low humidity flue gas side has the gas water heat transfer portion of flue gas side and waste heat water side, connects the waste heat water input tube and the waste heat water output tube of waste heat water side, the both ends of flue gas side communicate respectively humid tropical flue gas side with low temperature low humidity flue gas side.
2. The waste gas and sludge incineration flue gas waste heat recovery system according to claim 1, wherein the gas-gas heat exchanger is a dividing wall type leakage-free all-welded plate heat exchanger.
3. The waste sludge incineration flue gas waste heat recovery system according to claim 1, wherein the flue gas exhaust pipelines are respectively communicated with the flue gas input pipeline and the flue gas output pipeline, the flue gas input pipeline is located at the upstream of the flue gas output pipeline, and the flue gas exhaust pipelines among the flue gas input pipeline, the flue gas output pipeline, the flue gas input pipeline and the flue gas output pipeline are respectively provided with a shut-off valve.
4. The waste heat recovery system for flue gas generated by incinerating garbage and sludge as claimed in claim 1, wherein the gas-water heat exchanging part is a gas-water heat exchanger.
5. The waste sludge incineration flue gas waste heat recovery system according to claim 1, wherein the gas-water heat exchanging portion comprises a gas-water heat exchanger and a heat pump, the high-temperature high-humidity flue gas side, the flue gas side of the gas-water heat exchanger, the flue gas side of the heat pump, and the low-temperature low-humidity flue gas side are sequentially communicated, and the waste heat water input pipe, the waste heat water side of the heat pump, the waste heat water side of the gas-water heat exchanger, and the waste heat water output pipe are sequentially communicated.
6. The waste sludge incineration flue gas waste heat recovery system according to claim 5, wherein the gas-water heat exchanger and the heat pump are respectively provided with a condensed water collecting device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221905233.2U CN217763455U (en) | 2022-07-22 | 2022-07-22 | Waste sludge incineration flue gas waste heat recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221905233.2U CN217763455U (en) | 2022-07-22 | 2022-07-22 | Waste sludge incineration flue gas waste heat recovery system |
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| CN217763455U true CN217763455U (en) | 2022-11-08 |
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| CN202221905233.2U Active CN217763455U (en) | 2022-07-22 | 2022-07-22 | Waste sludge incineration flue gas waste heat recovery system |
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