CN215975499U - System for waste incineration flue gas waste heat coupling sludge drying - Google Patents
System for waste incineration flue gas waste heat coupling sludge drying Download PDFInfo
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- CN215975499U CN215975499U CN202121753373.8U CN202121753373U CN215975499U CN 215975499 U CN215975499 U CN 215975499U CN 202121753373 U CN202121753373 U CN 202121753373U CN 215975499 U CN215975499 U CN 215975499U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model relates to a system for coupling waste heat of waste incineration flue gas with sludge drying, which is used for solving the problems of overhigh exhaust gas temperature and high energy consumption of a sludge drying process of the conventional incinerator. The utility model comprises a waste heat boiler, a semidry method tower, a bag-type dust collector, an induced draft fan, a chimney, and a hot water circulation system and an air circulation system which are additionally arranged between the induced draft fan and the chimney. Hot water circulating system be used for with draught fan export exhaust high temperature flue gas carries out the heat exchange to reduce the temperature that gets into the flue gas of chimney, air circulating system then be used for with hot water circulating system carries out the heat exchange, in order to promote the temperature that is used for the air of sludge drying. The hot water circulating system of the utility model lowers the temperature of the high-temperature flue gas in the circulating heat exchange process, and the air circulating system uses the heat of the high-temperature flue gas for sludge drying, thereby reducing the energy consumption of sludge drying, improving the heat utilization rate of the whole plant, saving the cost and increasing the economic benefit.
Description
Technical Field
The utility model belongs to the technical field of energy recovery, and particularly relates to a system for drying sludge by coupling waste heat of waste incineration flue gas.
Background
Domestic garbage in China is large in production amount, garbage is low in calorific value and is not easy to burn completely, main harmful substances in smoke generated by garbage incineration are fly ash particles, acid gas and heavy metal, and if pollution generated by the smoke generated by the domestic garbage incineration cannot be effectively controlled and treated, the pollution to the ecological environment and human health is seriously damaged. In addition, the central financial subsidy is always an important profit source for the waste incineration power generation project, and if the profit is calculated according to the 280-degree on-grid electricity of each ton of waste, about 20% of the operation and the income of a waste incineration power plant are all from the subsidy. In autumn of 2020, two emphatic policies of ' implementation scheme for perfecting construction and operation of biomass power generation project ' and ' supplement notice about related matters of ' a plurality of opinions about promoting healthy development of non-aqueous renewable energy power generation ' are discharged, the reasonable utilization hours of the whole life cycle of biomass power generation projects (including agriculture and forestry biomass power generation, waste incineration power generation and biogas power generation) are formally determined to be 82500 hours, and the electricity price supplement application of the waste incineration power generation projects needs to meet the following two conditions: (1) when the number of hours reasonably utilized for the full life cycle of the project has not been exceeded (i.e., 82500 hours); (2) within 15 years from the date of project integration. Beyond either of the first two, the project no longer enjoys the central financial subsidy funds. After 82500 hours which is reasonably utilized in the full life cycle is reached, if the price of the post on-line electricity is 0.45 yuan/degree, the net profit of the project is reduced by about 12 percent, which is a threshold that all waste incineration power generation projects must cross. Furthermore, after sorting the waste, the amount of waste residue will decrease, from about 35% to about 20%, while the calorific value increases, expected to increase from 1600 to 1900 kcal. Under the rated power of the incinerator, the smoke temperature of the boiler is higher than the design temperature, and the smoke temperature is about 230-235 ℃.
Under the large trend that subsidies are moved back, environmental protection policies are tightened, and project approval is slowed down, the waste incineration power generation project needs to be put down to the dependence of subsidies and policies, breakthroughs must be searched from other aspects, the efficiency of the waste incineration boiler is improved, and the demand of energy conservation transformation is increasingly urgent.
Fig. 1 is a current waste incineration flue gas waste heat treatment's process flow diagram, including exhaust-heat boiler 1, semi-dry tower 2, sack cleaner 3, draught fan 4 and the chimney 5 that sets gradually, the high temperature flue gas after the waste incineration gets into exhaust-heat boiler 1 and carries out heat recovery, and the temperature is about 230 degrees centigrade when discharging exhaust-heat boiler 1, then carries out desulfurization treatment through semi-dry tower 2, gets into sack cleaner 3 afterwards and removes dust, is discharged by chimney 5 through draught fan 4 afterwards. The temperature of the discharged flue gas is very high, the temperature of the discharged flue gas is always an important index for measuring the efficiency of the boiler, the efficiency of the boiler can be reduced due to the overhigh temperature of the discharged flue gas, huge energy waste can be caused, and adverse effects can be brought to the environment.
The existing sludge drying process is divided into direct heating, indirect heating and direct-indirect combined heating according to the heating mode; according to the process mode, the method is divided into drum drying, fluidized bed drying, disc drying, conveyer belt drying, tubular drum drying, membrane drying, slurry drying, turntable drying, solar drying, vacuum filtration drying, centrifugal dehydration drying and the like. However, the dryers used in these processes need to be maintained by means of very complex monitoring systems, and the energy consumption of the systems is also very high.
SUMMERY OF THE UTILITY MODEL
The utility model provides a system for coupling waste heat of waste incineration flue gas with sludge drying, aiming at solving the problems of overhigh exhaust gas temperature and high energy consumption of the sludge drying process of the existing incinerator.
The technical scheme adopted by the utility model for solving the technical problems is as follows:
the utility model provides a system of waste incineration flue gas waste heat coupling sludge drying, includes exhaust-heat boiler, semidry tower, sack cleaner, draught fan and the chimney that sets gradually, still includes the draught fan with the hot water circulating system who adds between the chimney and with the air circulating system that hot water circulating system connects. Hot water circulating system be used for with draught fan export exhaust high temperature flue gas carries out the heat exchange to reduce the temperature that gets into the flue gas of chimney, air circulating system then be used for with hot water circulating system carries out the heat exchange, in order to promote the temperature that is used for sludge drying's air, wherein:
the hot water circulating system is a loop formed by a flue gas waste heat recovery heat exchanger and a gas/water heat exchanger, and comprises two circulating heat exchange processes;
the air/water heat exchanger is shared by the hot water circulating system and the air circulating system, so that the two circulations are connected in parallel;
the air circulation system is a loop consisting of an air/water heat exchanger, a low-temperature sludge drier and a condenser, and comprises the circulating processes of heat exchange, sludge drying, temperature reduction and dehumidification.
Further, hot water circulating system's flue gas waste heat recovery heat exchanger set up in between draught fan and the chimney, including flue gas entry and exhanst gas outlet, the high temperature flue gas is followed draught fan export is discharged, gets into carry out the heat exchange for the first time with low temperature heat medium water wherein in the flue gas waste heat recovery heat exchanger.
According to the utility model, the flue gas waste heat recovery heat exchanger is preferably a fluoroplastic heat exchanger, an enamel pipe or a silicon carbide pipe.
Further, low temperature sludge drying ware among the air circulating system set up in gas/water heat exchanger with between the condenser, the upper bearing gas/water heat exchanger, lower joint the condenser, be used for sludge drying process among the air circulating system.
Further, the low-temperature sludge drier comprises a high-water-content sludge inlet and a low-water-content sludge outlet.
And the condenser in the air circulation system is positioned behind the low-temperature sludge drier and used for the cooling and dehumidifying process of the air circulation system.
The condenser comprises a circulating cooling water inlet, a hot and humid air inlet, a return water outlet and a dewatering outlet, wherein the hot and humid air inlet is communicated with the air outlet of the low-temperature sludge drier.
The utility model has the beneficial effects that:
1. through the hot water circulating system, the high-temperature flue gas is cooled in the circulating heat exchange process, and the exhaust temperature is reduced.
2. The heat of the high-temperature flue gas is used for drying the sludge by using the air circulation system, so that the energy consumption of sludge drying is reduced.
3. The heat utilization rate of the whole plant is improved, the cost is saved, and the economic benefit is increased.
Drawings
FIG. 1 is a process flow diagram of the conventional waste incineration flue gas treatment.
FIG. 2 is a process flow diagram of the waste incineration flue gas coupling sludge drying system of the present invention.
In the figure:
1-a waste heat boiler, 2-a semi-dry method tower, 3-a bag-type dust collector, 4-an induced draft fan and 5-a chimney;
101-a flue gas waste heat recovery heat exchanger, 102-a gas/water heat exchanger, 103-a low-temperature sludge drier and 104-a condenser.
Detailed Description
The utility model is further described with reference to the following drawings and detailed description, which are intended to be illustrative and not limiting. It will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solutions claimed in the claims of the present application can be implemented without these technical details and with various changes and modifications based on the following embodiments.
As shown in fig. 2, the system for coupling waste heat of waste incineration flue gas with sludge drying mainly comprises a waste heat boiler 1, a semidry tower 2, a bag-type dust collector 3, an induced draft fan 4, a chimney 5, a hot water circulation system and an air circulation system, wherein the waste heat boiler, the semidry tower 2, the bag-type dust collector 3, the induced draft fan 4 and the chimney 5 are sequentially arranged, and the hot water circulation system and the air circulation system are additionally arranged between the induced draft fan 4 and the chimney 5 and are connected with the hot water circulation system. Hot water circulating system is used for following 4 export exhaust high temperature flue gas of draught fan carry out the heat exchange to reduce the temperature from the flue gas that gets into chimney 5, air circulating system then be used for with hot water circulating system carries out the heat exchange, with the temperature that promotes the air that is used for the sludge drying, wherein:
the hot water circulation system is a loop formed by a flue gas waste heat recovery heat exchanger 101 and an air/water heat exchanger 102, and comprises two circulating heat exchange processes: (1) the high-temperature flue gas discharged from the outlet of the induced draft fan 4 exchanges heat with the low-temperature heat medium water in the flue gas waste heat recovery heat exchanger 101, in the process, the temperature of the high-temperature flue gas is reduced after heat exchange, and the temperature of the low-temperature heat medium water is increased after heat exchange; and (2) heat exchange between the heated high-temperature heat medium water and the low-temperature dry air in the gas/water heat exchanger 102, in the process, the heat medium water becomes low-temperature heat medium water after heat exchange, and the low-temperature heat medium water returns to the flue gas waste heat recovery heat exchanger 101 again to exchange heat with high-temperature flue gas;
the gas/water heat exchanger 102 is common to the hot water circulation system and the air circulation system, so that the two circulations are connected in parallel;
the air circulation system is a loop formed by an air/water heat exchanger 102, a low-temperature sludge drier 103 and a condenser 104, and comprises the following circulating processes of heat exchange, sludge drying, temperature reduction and dehumidification: (1) the low-temperature dry air exchanges heat with high-temperature heat medium water in the air/water heat exchanger 102, and in the process, the low-temperature dry air becomes high-temperature hot air after heat exchange; (2) high-temperature hot air discharged from the air/water heat exchanger 102 enters the low-temperature sludge drier 103 to heat and raise the temperature of the high-water-content sludge, in the process, the temperature of the high-temperature hot air is reduced to be damp and hot air after the high-temperature hot air is contacted with the high-water-content sludge, and the high-water-content sludge is heated (dried); (3) the wet and hot air discharged from the sludge drier 103 is further cooled and dehumidified in the condenser 104 to become low-temperature dry air, and the low-temperature dry air returns to the air/water heat exchanger 102 again to exchange heat with high-temperature hot water.
Further, flue gas waste heat recovery heat exchanger 101 set up in between draught fan 4 and the chimney 5, including flue gas entry and exhanst gas outlet, the high temperature flue gas is followed draught fan 4 export is discharged, gets into carry out the heat exchange for the first time with low temperature heat medium water wherein in the flue gas waste heat recovery heat exchanger 101, the high temperature heat medium water after being heated gets into in the gas/water heat exchanger 102.
Specifically, the temperature of the flue gas at the outlet of the waste heat boiler 1 is 150-250 ℃, and the temperature of the flue gas entering the flue gas waste heat exchanger 101 from the induced draft fan 4 is 100-200 ℃.
Preferably, the flue gas waste heat recovery heat exchanger 101 is made of a corrosion-resistant material, such as a fluoroplastic heat exchanger, an enamel pipe or a silicon carbide pipe, so as to avoid corrosion caused by flue gas cooling.
Further, the low-temperature dry air inside the air/water heat exchanger 102 exchanges heat with the high-temperature heat medium water discharged after being heated in the flue gas waste heat recovery heat exchanger 101, the low-temperature dry air becomes high-temperature hot air after being heated, and the high-temperature heat medium water becomes low-temperature heat medium water after being cooled. When the gas/water heat exchanger 102 is in a hot water circulating system, the low-temperature heat medium water returns to the flue gas waste heat recovery heat exchanger 101 to exchange heat with high-temperature flue gas again so as to be recycled; the air/water heat exchanger 102 is arranged in an air circulation system, and the high-temperature hot air enters the low-temperature sludge drier 103 to dry the sludge with high water content. As such, the hot water circulation system and the air circulation system are connected in parallel through the air/water heat exchanger 102.
Specifically, in the hot water circulation process, the low-temperature heat medium water is heated to 100-120 ℃ by the high-temperature flue gas, and the heated heat medium water heats the low-temperature air in the gas/water heat exchanger 102 to 90-100 ℃.
Further, the low-temperature sludge drier 103 is arranged between the gas/water heat exchanger 102 and the condenser 104, the gas/water heat exchanger 102 is supported at the upper part, and the condenser 104 is connected at the lower part. The low-temperature sludge dryer 103 comprises a high-water-content sludge inlet and a low-water-content sludge outlet, high-temperature hot air input from the air/water heat exchanger 102 heats the high-water-content sludge entering the low-temperature sludge dryer 103, the high-water-content sludge is dried into low-water-content sludge, and the high-temperature air is combined with steam evaporated from the high-water-content sludge to form damp and hot air. The low moisture sludge is discharged to an incinerator for incineration and the hot humid air is delivered to the condenser 104.
Specifically, the high-water-content sludge in the low-temperature sludge drier 103 is sludge with a water content of more than 70%, and the low-water-content sludge is sludge with a water content of less than 40%.
Further, the condenser 104 is located behind the low-temperature sludge dryer 103 and comprises a circulating cooling water inlet, a hot and humid air inlet, a return water outlet, a dewatering outlet and a dry air outlet, wherein the hot and humid air inlet and the dry air outlet are respectively communicated with the low-temperature sludge dryer 103 and the air/water heat exchanger 102, and are used for the cooling and dehumidifying process of the air circulating system. The wet and hot air delivered from the low-temperature sludge drier 103 is cooled by the low-temperature cooling water in the condenser 104, as the temperature gradually drops to a temperature lower than the dew point temperature, the water vapor in the wet and hot air is gradually condensed to form condensed water, at this time, the wet and hot air is converted into low-temperature dry air and condensed water, the low-temperature dry air is delivered into the air/water heat exchanger 102 to perform another round of heat exchange with high-temperature hot water, and the condensed water is discharged.
The working process of the waste incineration flue gas waste heat coupling sludge drying system of the embodiment is as follows:
working process of the hot water circulating system: high temperature flue gas of temperature about 145 ℃ passes through draught fan 4 pressure boost discharges extremely in the flue gas waste heat recovery heat exchanger 101, utilize 145 ℃ flue gas waste heat to give about 70 ℃ low temperature heat medium water heating, the high temperature heat medium water after the heating is about 100 ℃ -120 ℃, above-mentioned high temperature heat medium water gets into give about 40 ℃ low temperature dry air in the gas/water heat exchanger 102 and heat up, thereby the low temperature heat medium water after the heat transfer gets back again carry out the heat exchange with the high temperature flue gas in the flue gas waste heat recovery heat exchanger 101 and recycle.
Air circulation system work flow: the high-temperature hot air of 90 ℃ to 100 ℃ heated by the high-temperature heat medium water enters the low-temperature sludge drier 103 to heat and dry the sludge with the water content of about 80 percent, the high-temperature hot air is combined with the water vapor evaporated by the sludge with the water content of 80 percent to form wet hot air of about 70 ℃, the wet hot air of 70 ℃ enters the condenser 104 to be cooled by low-temperature cooling water of about 28 ℃ and to separate out condensed water, so that the wet hot air of 70 ℃ is cooled and dehumidified to form low-temperature dry air of about 40 ℃, and then the low-temperature dry air is sent to the gas/water heat exchanger 102 to perform another round of heat exchange with the high-temperature heat medium water for recycling.
A flue gas emission process: a large amount of high-temperature flue gas generated after the garbage incineration enters the waste heat boiler 1 to recover heat, enters the semi-dry tower 2 to be subjected to semi-dry desulfurization treatment when the temperature of the flue gas is about 230 ℃, and then enters the bag-type dust collector 3 to be subjected to dust removal treatment. High temperature flue gas after dust removal processing passes through draught fan 4 pressure boost discharges extremely in the flue gas waste heat recovery heat exchanger 101, the temperature is about 145 ℃ this moment, utilizes about 145 ℃ high temperature flue gas waste heat and about 70 ℃ low temperature hot media water to carry out the heat exchange, makes the high temperature flue gas reach the effect of cooling after recycling, follows at last chimney 5 discharges.
This waste incineration flue gas waste heat coupling sludge drying's technology adds hot water circulation system and air circulation system on current waste incineration flue gas processing system, carries out waste heat recovery through several heat exchanges to exhaust flue gas, is used for the sludge drying with the heat of retrieving, has not only reduced exhaust gas temperature, still make full use of heat energy, reduces the energy consumption, has improved the thermal efficiency of whole factory.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. The utility model provides a system of msw incineration flue gas waste heat coupling sludge drying, includes exhaust-heat boiler (1), semidry tower (2), sack cleaner (3), draught fan (4) and chimney (5) that set gradually, its characterized in that still includes draught fan (4) with the hot water circulating system who adds between chimney (5) and with the air circulating system that hot water circulating system connects, hot water circulating system is used for following draught fan (4) export exhaust high temperature flue gas carries out the heat exchange to reduce the temperature from the flue gas that gets into chimney (5), air circulating system then be used for with hot water circulating system carries out the heat exchange, in order to promote the temperature that is used for sludge drying's air, wherein:
the hot water circulating system is a loop formed by a flue gas waste heat recovery heat exchanger (101) and an air/water heat exchanger (102), and comprises two circulating heat exchange processes;
the gas/water heat exchanger (102) is shared by the hot water circulation system and the air circulation system, and the two circulations are connected in parallel;
the air circulation system is a loop formed by an air/water heat exchanger (102), a low-temperature sludge drier (103) and a condenser (104), and comprises a circulating heat exchange-sludge drying-cooling and dehumidifying process.
2. The system for coupling waste incineration flue gas waste heat and sludge drying according to claim 1, wherein the flue gas waste heat recovery heat exchanger (101) of the hot water circulating system is arranged between the induced draft fan (4) and the chimney (5) and comprises a flue gas inlet and a flue gas outlet, high-temperature flue gas is discharged from the outlet of the induced draft fan (4) and enters the flue gas waste heat recovery heat exchanger (101) to perform first heat exchange with low-temperature hot water therein.
3. The waste incineration flue gas waste heat coupling sludge drying system according to claim 2, wherein the flue gas waste heat recovery heat exchanger (101) is a fluoroplastic heat exchanger, an enamel pipe or a silicon carbide pipe.
4. The waste incineration flue gas waste heat coupling sludge drying system according to claim 1, wherein a low-temperature sludge dryer (103) in the air circulation system is arranged between the air/water heat exchanger (102) and the condenser (104), the air/water heat exchanger (102) is supported on the upper portion, and the condenser (104) is connected on the lower portion for a sludge drying process in the air circulation system.
5. The waste incineration flue gas waste heat coupling sludge drying system according to claim 4, wherein the low-temperature sludge dryer (103) comprises a high-moisture sludge inlet and a low-moisture sludge outlet.
6. The waste incineration flue gas waste heat coupling sludge drying system according to claim 1, wherein a condenser (104) in the air circulation system is located behind the low-temperature sludge dryer (103) and used for a cooling and dehumidifying process of the air circulation system.
7. The waste incineration flue gas waste heat coupling sludge drying system according to claim 6, wherein the condenser (104) comprises a circulating cooling water inlet, a hot humid air inlet, a return water outlet, a water removal outlet and a dry air outlet, and the hot humid air inlet and the dry air outlet are respectively communicated with the low-temperature sludge dryer (103) and the air/water heat exchanger (102).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121753373.8U CN215975499U (en) | 2021-07-28 | 2021-07-28 | System for waste incineration flue gas waste heat coupling sludge drying |
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| CN202121753373.8U CN215975499U (en) | 2021-07-28 | 2021-07-28 | System for waste incineration flue gas waste heat coupling sludge drying |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115367980A (en) * | 2022-07-13 | 2022-11-22 | 北京首创污泥处置技术有限公司 | System and method for drying sludge by using waste heat of flue gas of power plant |
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2021
- 2021-07-28 CN CN202121753373.8U patent/CN215975499U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115367980A (en) * | 2022-07-13 | 2022-11-22 | 北京首创污泥处置技术有限公司 | System and method for drying sludge by using waste heat of flue gas of power plant |
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