CN219160400U - Desulfurizing slurry heat recovery and water saving system - Google Patents
Desulfurizing slurry heat recovery and water saving system Download PDFInfo
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- CN219160400U CN219160400U CN202320223070.8U CN202320223070U CN219160400U CN 219160400 U CN219160400 U CN 219160400U CN 202320223070 U CN202320223070 U CN 202320223070U CN 219160400 U CN219160400 U CN 219160400U
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Abstract
The utility model provides a desulfurization slurry heat recovery and water saving system, which comprises a desulfurization tower, an absorption heat pump for absorbing slurry heat in the desulfurization tower and a power plant condensation pipeline for exchanging heat with the absorption heat pump, wherein a first heat exchange coil is arranged in a generator of the absorption heat pump to be communicated with auxiliary steam of the power plant to serve as a driving heat source of the heat pump, and then an evaporator of the absorption heat pump is used for recovering heat of slurry in the desulfurization tower through a second heat exchange coil to reduce the temperature of the slurry and return the slurry to the desulfurization tower, so that the temperature in the desulfurization tower is reduced to a certain extent, the discharge temperature of flue gas is reduced, the discharge of water vapor in the flue gas is reduced, and the water saving effect is achieved; the evaporator absorbs the heat of the slurry and transfers the heat to the absorber to heat the condensed water in the heat exchange pipeline once, and the generator absorbs the heat of the auxiliary steam of the power plant and transfers the heat to the condenser to heat the auxiliary steam of the power plant twice, so that the energy consumption of the low-pressure heater is effectively reduced, and the maximization of energy recycling is achieved.
Description
Technical Field
The utility model relates to the technical field of heat recovery and water saving, in particular to a desulfurization slurry heat recovery and water saving system.
Background
The heat loss of the exhaust smoke of the coal-fired power plant boiler in operation accounts for a large proportion, and the operation exhaust smoke temperature of some thermal power plants is often higher than a design value. Therefore, the reduction of the exhaust gas temperature of the power station boiler has important practical significance for energy conservation and emission reduction.
The limestone/gypsum wet desulfurization process is adopted in most domestic coal-fired power plant boiler desulfurization, the temperature of flue gas after wet desulfurization is about 50-55 ℃, the temperature of desulfurization slurry is about 50-55 ℃, and because the flue gas at the outlet of a desulfurizing tower is wet saturated flue gas, the moisture carried in the flue gas is higher, the estimated moisture carried in the flue gas of 1 300MW coal-fired boiler unit is about 100t/h, and the water vapor in the flue gas is directly discharged into the atmosphere, so that serious loss of moisture is caused for a power plant, and particularly for the power plant in a water resource deficient area, the water resource is extremely valuable, and becomes a key factor for restricting the normal and stable operation of the power plant. The power plant is used as a large water consumer, and has obvious performance in terms of water consumption and drainage. If the water is not strictly managed, the phenomenon of water resource waste is easily caused, and strict requirements are put forward for the water saving aim of the power plant in part of areas.
To solve the above problems, the conventional methods mainly include:
besides a large amount of sulfur dioxide, the flue gas generated in the operation process of the boiler of the coal-fired power plant also contains a large amount of fine particles, aerosol pollution is formed at a chimney smoke outlet, a large number of power plants using GGH at early stage use the flue gas after desulfurization by utilizing the heat of the high-temperature flue gas before desulfurization, the temperature of the flue gas after desulfurization is above 75 ℃, and the scheme lightens the pollution of the aerosol, but does not fully utilize the energy, and meanwhile, the method can meet the problems of acid dew point corrosion of equipment and equipment blockage leakage. To the problem of flue gas water conservation, some power plants adopt and install the flue gas condenser in the desulfurization export, come out recycle with wet saturated flue gas vapor condensation, but the condensation heat exchanger that the scheme of changing selected for use corrodes greatly, and the cost is higher moreover, and is great to the load of flue, and the engineering volume is great.
Disclosure of Invention
The utility model aims to provide a desulfurization slurry heat recovery and water saving system, which can reduce the consumption of water resources of a coal-fired power plant, realize the recovery and utilization of energy and reduce heat loss.
The utility model provides a desulfurization slurry heat recovery and water saving system, which comprises a desulfurization tower, an absorption heat pump for absorbing slurry heat in the desulfurization tower and a power plant condensation pipeline for exchanging heat with the absorption heat pump, wherein a first heat exchange coil pipe communicated with auxiliary steam of the power plant is arranged in a generator of the absorption heat pump, a second heat exchange coil pipe communicated with the desulfurization tower is arranged in an evaporator of the absorption heat pump, and a flue gas spray pipe is arranged at the top end of the interior of the desulfurization tower; and a shaft seal heater and a plurality of low-pressure heaters are sequentially arranged along the conveying direction of the power plant condensation pipeline, a heat exchange pipeline is communicated with the power plant condensation pipeline, and the heat exchange pipeline sequentially passes through the absorber and the condenser of the absorption heat pump and then flows back to the inlet end or the outlet end of any low-pressure heater from the inlet end or the outlet end of the shaft seal heater.
Further, the absorption heat pump comprises a generator, an absorber, an evaporator, a condenser and a heat exchanger, wherein a liquid outlet of the generator is communicated with a first spray pipe at the top end inside the absorber through a first heat exchange side of the heat exchanger, a liquid outlet of the absorber is communicated with a liquid inlet of the generator through a second heat exchange side of the heat exchanger, a vapor outlet of the generator is communicated with a vapor inlet of the condenser, a liquid outlet of the condenser is communicated with a liquid inlet of the evaporator, a vapor outlet of the evaporator is communicated with a vapor inlet of the absorber, and a liquid outlet of the evaporator is communicated with a second spray pipe at the top end inside the evaporator through a working medium pump.
Further, a third heat exchange coil is arranged in the absorber, a fourth heat exchange coil is arranged in the condenser, and the heat exchange pipeline flows back to the inlet end or the outlet end of any low-pressure heater after passing through the third heat exchange coil and the fourth heat exchange coil in sequence from the inlet end or the outlet end of the shaft seal heater.
Further, a flue gas spray pipe is arranged at the top end of the inside of the desulfurizing tower, a slurry circulating pump is arranged at the outer side of the desulfurizing tower, and a slurry outlet at the bottom end of the desulfurizing tower is communicated with the flue gas spray pipe through the slurry circulating pump.
Further, the flue gas spray pipe is arranged right below the flue gas outlet, and the height position of the flue gas inlet of the desulfurizing tower is lower than that of the flue gas spray pipe.
Furthermore, the power plant condensation pipeline is communicated with the heat exchange pipeline at the inlet end and the outlet end of the shaft seal heater, and valves are arranged on the heat exchange pipeline at the inlet end and the outlet end of the shaft seal heater; the power plant condensation pipeline is communicated with the heat exchange pipeline at the inlet end and the outlet end of the low-pressure heater, and valves are arranged at the inlet end and the outlet end of the low-pressure heater on the heat exchange pipeline.
Furthermore, a solution circulating pump is arranged on a communicating pipeline between the liquid outlet of the absorber and the liquid inlet of the generator.
Further, the outlet end of the first heat exchange coil is provided with a condensate water tank communicated with the first heat exchange coil.
Further, a first throttle valve is arranged on a communicating pipeline between the liquid outlet of the generator and the liquid inlet of the absorber.
Further, a second throttle valve is arranged on a communicating pipe between the liquid outlet of the condenser and the liquid inlet of the evaporator.
Compared with the prior art, the technical scheme of the utility model has the following beneficial effects: the first heat exchange coil is arranged in the generator of the absorption heat pump, so that the generator is communicated with auxiliary steam of a power plant to serve as a driving heat source of the heat pump, then the evaporator of the absorption heat pump carries out heat recovery on slurry in the desulfurizing tower through the second heat exchange coil, the slurry is returned to the desulfurizing tower after the temperature of the slurry is reduced, the temperature in the desulfurizing tower is reduced to a certain extent, and then the exhaust temperature of flue gas is reduced by matching with the flue gas spraying pipe, so that the water vapor emission in the flue gas is reduced, and a water saving effect is achieved; the evaporator absorbs the heat of the slurry and transfers the heat to the absorber to heat the condensed water in the heat exchange pipeline once, and the generator absorbs the heat of the auxiliary steam of the power plant and transfers the heat to the condenser to heat the auxiliary steam of the power plant twice, so that the energy consumption of the low-pressure heater is effectively reduced, and the maximization of energy recycling is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a diagram of the overall layout of the present utility model;
FIG. 2 is a diagram of the overall layout of an absorption heat pump of the present utility model;
reference numerals illustrate: 1-absorption heat pump, 2-generator, 3-heat exchanger, 4-absorber, 5-solution circulating pump, 6-working medium pump, 7-evaporator, 8-second throttle valve, 9-condenser, 10-first throttle valve, 11-desulfurizing tower, 1101-flue gas inlet, 1102-flue gas outlet, 12-slurry circulating pump, 13-first heat exchange coil, 14-second heat exchange coil, 15-slurry booster pump, 16-third heat exchange coil, 17-fourth heat exchange coil, 18-first spray pipe, 19-second spray pipe, 20-flue gas spray pipe, 21-power plant condensation pipeline, 22-heat exchange pipeline, 23-shaft seal heater, 24-low pressure heater.
Detailed Description
The technical solutions of the present utility model will be clearly and completely described in connection with the embodiments, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. Furthermore, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Example 1
As shown in fig. 1-2, a desulfurization slurry heat recovery and water saving system comprises a desulfurization tower 11, an absorption heat pump 1 for absorbing slurry heat in the desulfurization tower 11, and a power plant condensation pipeline 21 for exchanging heat with the absorption heat pump 1, wherein: the absorption heat pump 1 comprises a generator 2, an absorber 4, an evaporator 7, a condenser 9 and a heat exchanger 3, wherein a liquid outlet of the generator 2 is communicated with a first spray pipe 18 at the top end inside the absorber 4 through a first heat exchange side of the heat exchanger 3, a liquid outlet of the absorber 4 is communicated with a liquid inlet of the generator 2 through a second heat exchange side of the heat exchanger 3, and a solution circulating pump 5 is arranged on a communicating pipeline between the liquid outlet of the absorber 4 and the liquid inlet of the generator 2. A first throttle valve 10 is arranged on a communicating pipe between a liquid outlet of the generator 2 and a liquid inlet of the absorber 4; the steam outlet of the generator 2 is communicated with the steam inlet of the condenser 9, the liquid outlet of the condenser 9 is communicated with the liquid inlet of the evaporator 7, a second throttle valve 8 is arranged on a communicating pipeline between the liquid outlet of the condenser 9 and the liquid inlet of the evaporator 7, the steam outlet of the evaporator 7 is communicated with the steam inlet of the absorber 4, and the liquid outlet of the evaporator 7 is communicated with a second spray pipe 19 at the top end inside the evaporator through a working medium pump 6.
The generator 2 is internally provided with a first heat exchange coil 13 communicated with auxiliary steam of a power plant, and the outlet end of the first heat exchange coil 13 is provided with a condensate water tank communicated with the first heat exchange coil; the evaporator 7 of the absorption heat pump 1 is internally provided with a second heat exchange coil 14 communicated with the desulfurizing tower 11, and a slurry booster pump 15 is arranged on the second heat exchange coil 14 and used for continuously conveying slurry into the second heat exchange coil 14 for heat release; the top of desulfurizing tower 11 inside is equipped with flue gas shower 20 under flue gas outlet 1102, and flue gas shower 20's quantity can set up one or more, and slurry circulating pump 12 is installed in the outside of desulfurizing tower 11, and the slurry outlet of desulfurizing tower 11 bottom passes through slurry circulating pump 12 and flue gas shower 20 intercommunication, and desulfurizing tower 11 flue gas inlet 1101 highly is less than flue gas shower 20's high position. During operation, high-temperature flue gas enters the desulfurizing tower 11 through the flue gas inlet 1101 on the desulfurizing tower 11, and the temperature inside the desulfurizing tower 11 can be reduced because the slurry after heat exchange of the evaporator 7 flows back into the desulfurizing tower 11, and at the moment, the slurry after heat exchange is conveyed to the flue gas spray pipe 20 through the slurry circulating pump 12 to cool the flue gas, so that the flue gas temperature of the flue gas outlet 1102 of the desulfurizing tower 11 can be reduced to a certain extent, the emission of water vapor in the flue gas is reduced, and a water-saving effect is achieved.
For example: when the evaporator 7 absorbs the heat of the slurry in the desulfurizing tower 11, the slurry is used as a low-temperature heat source of the absorption heat pump 1, the slurry enters the evaporator 7 through the slurry booster pump 15 at the temperature of about 45 ℃, the heat of the slurry is absorbed by the evaporator 7, the slurry after heat exchange and temperature reduction returns to the desulfurizing tower 11, the temperature of the slurry in the desulfurizing tower 11 is about 25 ℃, and a certain amount of heat is recovered. The 25 ℃ slurry cooled by the evaporator 7 returns to the desulfurizing tower 11 again, and after being mixed with the slurry in the desulfurizing tower 11, the temperature in the desulfurizing tower 11 can be reduced by 1-5 ℃, the temperature of the slurry in the desulfurizing tower 11 is about 45 ℃, and the 45 ℃ slurry returns to the evaporator 7 of the absorption heat pump 1 again through the slurry booster pump 15 for heat exchange and temperature reduction, and then the circulation is repeated. The flue gas of the flue gas outlet 1102 of the desulfurizing tower 11 is saturated wet flue gas, and the temperature in the desulfurizing tower 11 can be reduced by 1-5 ℃ due to the cooled slurry, so that the temperature of the flue gas at the outlet of the desulfurizing tower 11 can be reduced by 1-5 ℃, the emission of water vapor in the flue gas is reduced, and the water-saving effect is achieved.
A shaft seal heater 23 and a plurality of low-pressure heaters 24 are sequentially arranged along the conveying direction of the power plant condensation pipeline 21, the power plant condensation pipeline 21 is communicated with a heat exchange pipeline 22, a third heat exchange coil 16 is arranged in the absorber 4, a fourth heat exchange coil 17 is arranged in the condenser 9, and the heat exchange pipeline 22 sequentially flows back to the inlet end or the outlet end of any low-pressure heater 24 from the inlet end or the outlet end of the shaft seal heater 23 through the third heat exchange coil 16 in the absorber 4 and the fourth heat exchange coil 17 in the condenser 9; valves are arranged on the heat exchange pipeline 22 at the inlet end and the outlet end of the shaft seal heater 23, and only one of the valves is opened when in use; valves are provided on the heat exchange conduit 22 at both the inlet and outlet ends of the low pressure heater 24, and only one of them is opened in use. Because the condensate water of the condenser of the power plant needs to be heated by the shaft seal heater 23 and the plurality of low-pressure heaters 24, in order to reduce the energy consumption of the heaters, the condensate water is led into the heat exchange pipeline 22 from the inlet end or the outlet end of the shaft seal heater 23 in the system, the heat exchange pipeline 22 is subjected to primary heating by the third heat exchange coil 16 of the absorber 4, and is subjected to secondary heating by the fourth heat exchange coil 17 of the condenser 9 and then flows back to the inlet end or the outlet end of one of the low-pressure heaters 24; because one or more slurries of the desulfurizing towers 11 enter the second heat exchange coil 14 of the evaporator 7 to release heat during actual use, the amount of the slurries subjected to heat exchange also affects the temperature of the condensed water in the heat exchange pipeline 22 for primary heating, and further the water inlet position needs to be selected according to the heat of the slurries actually absorbed by the evaporator 7, if the temperature of the slurries actually absorbed by the evaporator 7 is low, water needs to be taken at the inlet end of the shaft seal heater 23, and if the temperature of the slurries actually absorbed by the evaporator 7 is relatively high, water needs to be taken at the outlet end of the shaft seal heater 23; the position of the backwater is selected according to the temperature of the condensed water after the condensed water is actually heated, if the temperature of the condensed water in the heat exchange channel is relatively low, the condensed water needs to be returned to the inlet end of the corresponding low-pressure heater 24, and if the temperature of the condensed water after the heat exchange is relatively high, the condensed water needs to be returned to the outlet end of the corresponding low-pressure heater 24, and the condensed water does not need to be heated by the corresponding low-pressure heater 24, so that the energy consumption of the heater is effectively reduced.
Principle of operation
First, the auxiliary steam of the power plant enters the first heat exchange coil 13 of the generator 2 as driving steam of the heat pump, and the auxiliary steam of the power plant is condensed into condensed water after the heat pump solution is heated and evaporated and enters the condensate water tank. The absorption heat pump 1 of the system has two circulation, namely, a solution circulation, wherein concentrated solution in the generator 2 absorbs heat of auxiliary steam of a power plant and then enters the absorber 4 through the first throttle valve 10, low-pressure steam from the evaporator 7 is absorbed under the condition of low pressure, the low-pressure steam of the evaporator 7 is generated by absorbing slurry heat of the desulfurizing tower 11 through the second heat exchange coil 14, heat is released in the process of absorbing the steam, and the heat is used for heating condensed water in the heat exchange pipeline 22 once through the third heat exchange coil 16; and secondly, the refrigerant circulates, the refrigerant steam generated in the generator 2 is conveyed to the condenser 9 to release heat, and the heat is secondarily heated by the condensed water in the heat exchange pipeline 22 through the fourth heat exchange coil 17.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.
Claims (10)
1. The desulfurization slurry heat recovery and water saving system is characterized by comprising a desulfurization tower, an absorption heat pump for absorbing slurry heat in the desulfurization tower and a power plant condensation pipeline for exchanging heat with the absorption heat pump, wherein a first heat exchange coil pipe communicated with auxiliary steam of the power plant is arranged in a generator of the absorption heat pump, a second heat exchange coil pipe communicated with the desulfurization tower is arranged in an evaporator of the absorption heat pump, and a flue gas spray pipe is arranged at the top end in the desulfurization tower; and a shaft seal heater and a plurality of low-pressure heaters are sequentially arranged along the conveying direction of the power plant condensation pipeline, a heat exchange pipeline is communicated with the power plant condensation pipeline, and the heat exchange pipeline sequentially passes through the absorber and the condenser of the absorption heat pump and then flows back to the inlet end or the outlet end of any low-pressure heater from the inlet end or the outlet end of the shaft seal heater.
2. The system of claim 1, wherein the absorption heat pump comprises a generator, an absorber, an evaporator, a condenser and a heat exchanger, wherein a liquid outlet of the generator is communicated with a first spray pipe at the top end inside the absorber through a first heat exchange side of the heat exchanger, a liquid outlet of the absorber is communicated with a liquid inlet of the generator through a second heat exchange side of the heat exchanger, a vapor outlet of the generator is communicated with a vapor inlet of the condenser, a liquid outlet of the condenser is communicated with a liquid inlet of the evaporator, a vapor outlet of the evaporator is communicated with a vapor inlet of the absorber, and a liquid outlet of the evaporator is communicated with a second spray pipe at the top end inside the evaporator through a working medium pump.
3. The system of claim 2, wherein a third heat exchange coil is disposed in the absorber and a fourth heat exchange coil is disposed in the condenser, and the heat exchange pipeline flows from the inlet end or the outlet end of the shaft seal heater to the inlet end or the outlet end of any low pressure heater after passing through the third heat exchange coil and the fourth heat exchange coil in sequence.
4. The desulfurization slurry heat recovery and water saving system according to claim 1, wherein a slurry circulating pump is installed at the outer side of the desulfurization tower, and a slurry outlet at the bottom end of the desulfurization tower is communicated with the flue gas spraying pipe through the slurry circulating pump.
5. The system of claim 4, wherein the flue gas shower is disposed directly below the flue gas outlet, and the flue gas inlet of the desulfurizing tower is positioned at a lower elevation than the flue gas shower.
6. The desulfurization slurry heat recovery and water conservation system according to claim 1, wherein the power plant condensation pipeline is communicated with the heat exchange pipeline at the inlet end and the outlet end of the shaft seal heater, and valves are arranged on the heat exchange pipeline at the inlet end and the outlet end of the shaft seal heater; the power plant condensation pipeline is communicated with the heat exchange pipeline at the inlet end and the outlet end of the low-pressure heater, and valves are arranged at the inlet end and the outlet end of the low-pressure heater on the heat exchange pipeline.
7. The desulfurization slurry heat recovery and water-saving system according to claim 1, wherein a solution circulating pump is installed on a communicating pipe between the liquid outlet of the absorber and the liquid inlet of the generator.
8. The desulfurization slurry heat recovery and water conservation system according to claim 1, wherein the outlet end of the first heat exchange coil is provided with a condensate tank in communication therewith.
9. The desulfurization slurry heat recovery and water-saving system according to claim 1, wherein a first throttle valve is installed on a communication pipe between the liquid outlet of the generator and the liquid inlet of the absorber.
10. The desulfurization slurry heat recovery and water-saving system according to claim 1, wherein a second throttle valve is installed on a communicating pipe between the liquid outlet of the condenser and the liquid inlet of the evaporator.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320223070.8U CN219160400U (en) | 2023-02-06 | 2023-02-06 | Desulfurizing slurry heat recovery and water saving system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320223070.8U CN219160400U (en) | 2023-02-06 | 2023-02-06 | Desulfurizing slurry heat recovery and water saving system |
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| CN219160400U true CN219160400U (en) | 2023-06-09 |
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| CN202320223070.8U Active CN219160400U (en) | 2023-02-06 | 2023-02-06 | Desulfurizing slurry heat recovery and water saving system |
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