CN209865703U - Single-tower double-circulation energy-saving whitening device - Google Patents
Single-tower double-circulation energy-saving whitening device Download PDFInfo
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- CN209865703U CN209865703U CN201920148650.9U CN201920148650U CN209865703U CN 209865703 U CN209865703 U CN 209865703U CN 201920148650 U CN201920148650 U CN 201920148650U CN 209865703 U CN209865703 U CN 209865703U
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Abstract
The utility model discloses a single-tower double-circulation energy-saving whitening device. The device is characterized in that a desulfurization section and an absorption section are sequentially arranged in a shell of a flue gas purification device from bottom to top, a liquid storage unit is arranged between the desulfurization section and the absorption section, a first spraying layer is arranged between the absorption section and the top end of the shell, a second spraying layer is arranged between a flue gas inlet of the desulfurization section and the liquid storage unit, flue gas enters the absorption section from the desulfurization section and is in countercurrent contact with concentrated solution or clean water sprayed on the top of the absorption section, during a heating season, the concentrated solution absorbs water in the flue gas and becomes thin, latent heat is released in the phase change process of the separated water to heat the flue gas and a salt solution, the heated solution is collected by the liquid storage unit and exchanges heat through a first heat exchanger on a first circulation loop, the balance state in the absorption section is flexibly controlled by utilizing the size of the taken heat, the sensible heat of the original flue gas and the latent heat of water vapor of the purified flue gas are deeply recovered and utilized, and the problem, greatly saving water resources.
Description
Technical Field
The utility model belongs to the technical field of the environmental protection, concretely relates to single tower double-circulation festival can whitewash device.
Background
At present, the mainstream wet smoke plume elimination technology is that a flue gas condenser and a spray tower are arranged behind a desulfurizing tower or a slurry cooler is additionally arranged on a slurry circulating slurry pipe, so that the temperature of flue gas at the outlet of the desulfurizing tower is reduced to separate out moisture, and the clean flue gas is heated by using the waste heat of the raw flue gas.
The cold source is a problem which must be faced by the current mainstream technology in order to take away latent heat of purified flue gas, particularly for areas which stipulate the outlet flue gas temperature and moisture content of a desulfurizing tower, the cold source needs to be condensed in winter or even needs to be condensed in summer, and a water cooling tower in a power plant is always operated at full load in summer, so that an effective cold source cannot be provided, if investment is required to be increased for newly-built water cooling towers, waste water is replaced by good water, and a water-saving effect cannot be achieved. If the new mechanical ventilation cooling tower is built, the construction cost is extremely high, and the new mechanical ventilation cooling tower cannot bear a power plant.
Therefore, the current mainstream technology has the problems of energy and water resource waste, high investment cost, and no profit due to only investment for eliminating the wet smoke plume.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the utility model is that there is a large amount of latent heats of the sensible heat of the former flue gas of unable degree of depth utilization and water vapor in the clean flue gas in the current technical route of retrieving the flue gas waste heat, and energy and water waste, investment cost are big simultaneously, eliminate the defect that colored smoke plume only invests and does not have the income to a device that single tower double-cycle festival can whiten is proposed.
In order to solve the technical problem, the utility model provides a technical scheme as follows:
a single-tower double-circulation energy-saving whitening device, which comprises a flue gas purification device, wherein the flue gas purification device comprises a shell and a plurality of liquid crystal panels,
the desulfurization section and the absorption section are sequentially arranged in the shell from bottom to top;
a liquid storage unit disposed between the desulfurization section and the absorption section and within the housing to divide the desulfurization section and the absorption section, the flue gas being adapted to pass from the desulfurization section through the liquid storage unit into the absorption section;
the first spraying layer is arranged between the absorption section and the top end of the shell and positioned in the shell, the liquid inlet end of a first circulating loop is communicated with the liquid storage unit, the liquid outlet end of the first circulating loop is communicated with the first spraying layer, and a first heat exchanger is arranged on the first circulating loop so as to cool the absorption liquid in the liquid storage unit and send the absorption liquid into the first spraying layer and spray the rising flue gas;
and the second spraying layer is arranged between the flue gas inlet of the desulfurization section and the liquid storage unit and is positioned in the shell, the liquid inlet end of the second circulation loop is communicated with the bottom of the shell, and the liquid outlet end of the second circulation loop is communicated with the second spraying layer so as to send the desulfurization liquid in the bottom of the shell into the second spraying layer and spray the rising flue gas.
Further, the reservoir unit, including,
a liquid accumulation chassis adapted to be placed within the housing;
the air duct is arranged on the effusion chassis at intervals, extends to the absorption section, and is used for enabling the flue gas to enter the absorption section from the desulfurization section through the air duct;
and the liquid storage space is arranged above the liquid accumulation chassis, is positioned between adjacent air ducts or between the air ducts and the inner wall of the shell and is used for receiving the sprayed absorption liquid.
Further, the absorption device comprises a liquid storage device which is arranged on the first circulation loop so as to store the absorption liquid in the absorption section in the liquid storage device in a non-heating season; and in the heating season, the absorption liquid in the liquid storage device is sent into the absorption section.
In order to reduce the load of the tower body, the absorption section is not provided with a liquid pool in the tower, and the absorption liquid is guided into the liquid pool of the absorption liquid outside the tower through a liquid storage unit (namely, a liquid receiving disc), so that the load of the whole tower is reduced. The absorption section can use absorption liquid to recover heat and moisture all the year round; the absorption liquid can be used for recovering heat and moisture in the heating season, and clear water is used for spraying in the non-heating season to condense and separate water from the flue gas so as to eliminate the wet smoke plume.
The liquid inlet end of the third circulation loop is communicated with the liquid storage device, the liquid outlet end of the third circulation loop is communicated with the first spraying layer, and the third circulation loop is provided with a solution filtering conditioning system and a heat exchange device.
And the liquid inlet end of the fourth circulation loop is communicated with the liquid storage device, the liquid outlet end of the fourth circulation loop is communicated with the first spraying layer, and a fourth heat exchanger and a regeneration system are sequentially arranged on the fourth circulation loop.
Furthermore, the regeneration system comprises a flash tank, wherein a dilute solution inlet is arranged in the middle of the flash tank, a steam outlet is arranged at the upper part of the flash tank, a concentrated solution outlet is arranged at the lower part of the flash tank, a fifth heat exchanger is communicated with the dilute solution inlet, and the concentrated solution outlet is communicated with the fourth heat exchanger, so that the absorption liquid sprayed with the flue gas enters the flash tank for regeneration, comes out of the concentrated solution outlet, enters the fourth heat exchanger, and exchanges heat with the absorption liquid sprayed with the flue gas;
the steam outlet, the compressor, the saturator and the fifth heat exchanger are communicated in sequence, so that absorption liquid after being sprayed with the flue gas and secondary steam exchange heat in the fifth heat exchanger in a non-heating season and then enter the flash tank.
The liquid inlet end of the fifth circulation loop is communicated with the liquid storage unit, the liquid outlet end of the fifth circulation loop is communicated with the first spraying layer, and a water storage device and a refrigerating device are arranged on the fifth circulation loop so that water in the water storage device is sent into the refrigerating device for refrigeration in non-heating seasons and then sent into the first spraying layer for circulating spraying of flue gas; in the heating season, the water in the liquid storage unit is stored in the water storage device.
The system further comprises a second heat exchanger and a third heat exchanger, wherein the first heat exchanger, the second heat exchanger and the third heat exchanger are sequentially communicated, so that the incoming water or low-condensed water of a heat supply network sequentially passes through the first heat exchanger, the second heat exchanger and the third heat exchanger and exchanges heat with substances entering the corresponding heat exchangers;
the fifth heat exchanger is communicated with the second heat exchanger and/or the third heat exchanger, so that the extracted air condensate water of the fifth heat exchanger is fed into the second heat exchanger and/or the third heat exchanger for heat exchange and then returned to the boiler for water supply, and the secondary steam condensate water of the fifth heat exchanger is fed into the third heat exchanger and/or the second heat exchanger for heat exchange and then is used as process make-up water;
the steam outlet is also communicated with the third heat exchanger so as to send secondary steam into the third heat exchanger for heat exchange.
The third heat exchanger is communicated with the economizer so as to exchange heat between condensed water and the flue gas from the dust removal device in the economizer.
The first demister is arranged between the first spraying layer and the top end of the shell and is positioned in the shell;
and the second demister is arranged between the second spraying layer and the liquid storage unit and is positioned in the shell.
Further, the horizontal heights of the adjacent umbrella caps can be flush or different relative to the effusion bottom plate;
and a smoke outlet at the top end of the shell is communicated with a chimney.
It should be noted that the term "spray white elimination" in the present invention refers to a method of spraying absorption liquid and/or clear water to recover heat in flue gas and eliminate white smoke.
The utility model discloses technical scheme has following advantage:
1. the utility model provides a single-tower double-cycle festival can whitewash device, set gradually desulfurization section and absorption section from bottom to top in flue gas purification device's casing, and set up the liquid storage unit between desulfurization section and absorption section, set up first layer that sprays between absorption section and casing top, set up the second layer that sprays between the flue gas import of desulfurization section and liquid storage unit, in the actual working process, the flue gas gets into the absorption section from the desulfurization section, and with the concentrated solution (such as strong salt solution) or the clear water countercurrent contact that the absorption section top sprayed, in the heating season, the concentrated solution absorbs moisture in the flue gas and becomes thin, release latent heat in the moisture phase transition, heat flue gas and salt solution, the solution after the intensification is collected by the liquid storage unit, and through the first heat exchanger heat transfer on the first circulation circuit, utilize the heat to control the equilibrium state in the absorption section; in non-heating seasons, besides the concentrated solution, clear water can be used for spraying to cool the flue gas, and the saturated clean flue gas is cooled and separated out of water, so that the effect of water extraction is achieved, and the heated water can be recycled after heat exchange through a refrigerating device. Finally, the sensible heat of the original flue gas and the latent heat of the purified flue gas steam are deeply recovered and utilized by the means, the problem that a large amount of cold sources are needed for cooling and condensing the flue gas in the prior art is solved, and water resources are greatly saved. Meanwhile, the water in the clean flue gas is recovered, the system operation cost is reduced, the problems that colored smoke plumes are eliminated in a coal-fired power plant or other industries, and a deep water lifting system is only put into use and does not have income are solved, the environment-friendly effects of high efficiency, energy conservation, emission reduction and the like are achieved, and the method has good social and economic influences. Meanwhile, the desulfurization section and the absorption section are arranged in the same shell, so that the process flow is greatly simplified, and the equipment cost is reduced.
2. The utility model provides a single-tower double-circulation energy-saving whitening device, firstly, the water content of clean flue gas is greatly reduced by utilizing the absorption section, and the dryness and the temperature of the clean flue gas can be improved due to latent heat released by phase change in the process that steam is absorbed by concentrated solution, thereby achieving the effects of eliminating colored smoke plumes, deeply lifting water, reducing the dust content of the clean flue gas and recovering the low-quality latent heat of the water vapor in the clean flue gas; then the concentrated solution after absorbing the water vapor in the absorption section is changed into a dilute solution, a part of the dilute solution is heated up through a fourth heat exchanger, and then is recovered to the original concentration through a regeneration system, and finally returns to the absorption section; the other part of the concentrated solution is heated by a heat exchange medium (such as heat supply network water) through a first heat exchanger and then returns to the absorption device, the flow sizes of the two parts of the concentrated solution are adjusted according to specific requirements, and the water absorption capacity of the concentrated solution per unit mass can be changed by adjusting the flow ratio of the two parts of the concentrated solution; in addition, the dilute solution sent to the regeneration system exchanges heat with saturated steam generated by the regeneration system or air exhaust of a steam turbine, and enters a flash tank for flash evaporation and regeneration to become concentrated solution, the concentrated solution returns to the absorption device for recycling, and the dilute solution is heated by air exhaust of a unit in a heating season for regeneration; the regeneration process in non-heating seasons utilizes saturated steam generated after secondary steam compression at the top of the regeneration system, the saturated steam releasing latent heat becomes secondary steam condensate water, the secondary steam condensate water enters the third heat exchanger again to exchange heat with heat supply network water, and the cooled condensate water can be used as desulfurization section demister flushing water, absorption section demister flushing water or as process make-up water and the like, so that the cost and the energy consumption are reduced. Avoids the regenerative use of the steam of the power plant, and can effectively reduce the steam consumption.
3. The utility model provides a single-tower double-circulation energy-saving whitening device, in the heating season of a regeneration system, a steam turbine is adopted to pump steam to be used as a regeneration driving heat source, and pumped condensate water is returned to a boiler for water supply after being subjected to heat exchange by a second heat exchanger; in non-heating seasons, secondary steam of a compressor, a saturator and a flash tower is adopted, saturated steam is generated after compression, and condensed water is used for process water supplement of a desulfurization section, or clear water is adopted for spraying, or the combination of the two. After heat exchange and temperature rise of heat supply network water or low-condensed water are carried out through a fourth heat exchanger of the absorption device, heat exchange is carried out with a fifth heat exchanger of the regeneration system, the requirement of the temperature of the heat supply network water is met in the heating season, and the heat supply network is returned to the heating season; the low-temperature economizer is used for heating low-temperature condensed water in non-heating seasons or the low-temperature economizer is used for removing low-temperature condensed water after heat exchange, so that the influence on the generating capacity of the unit in the non-heating seasons is small. The problems that a coal-fired power plant or other industries eliminate wet smoke plumes and a deep water lifting system is only put into use and does not have income are solved through the mode, latent heat of clean smoke water vapor behind the desulfurization device is further recovered through a compressor, a saturator and a flash tower system, moisture in the clean smoke is recovered, the operation cost of the system is reduced, and efficient energy-saving emission-reducing and other environment-friendly effects are achieved.
4. The utility model provides a single tower double-cycle festival can whitewash device not only can be used for heating the heat supply network water or lowly adding the condensation water with former flue gas sensible heat, can also retrieve a large amount of latent heats of vapor in the flue gas simultaneously, and flue gas waste heat is retrieved to the degree of depth, because retrieve latent heat in-process flue gas temperature and rise simultaneously, can reduce the flue gas moisture content simultaneously and improve flue gas temperature, reaches and retrieves latent heat and eliminate colored smoke feather in coordination and reduce the effect of flue gas dust content. The device through the degree of depth water lift thereby retrieve water economy resource, because system's equipment is simple, can reduce system operation pressure drop about one third compared with present correlation technique, save the working costs, have fine environmental protection and energy saving effect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a layout diagram of a single-tower double-circulation energy-saving whitening device in an embodiment of the present invention;
FIG. 2 is a schematic structural view of a flue gas purification device in an embodiment of the present invention;
FIG. 3 is a plan view showing a structure of a liquid storage unit in the embodiment of the present invention;
FIG. 4 is a plan view showing another structure of the liquid storage unit in the embodiment of the present invention;
FIG. 5 is a side view showing a structure of a liquid storage unit in the embodiment of the present invention;
FIG. 6 is a side view showing another structure of the reservoir unit in the embodiment of the present invention;
FIG. 7 is a schematic diagram of a regeneration system according to an embodiment of the present invention;
wherein the reference numerals are represented as:
1-a dust removal device; 2-a coal economizer; 3-a flue gas purification device; 3-1-absorption section; 3-2-desulfurization section; 3-3-a first spray layer; 3-4-a second spray layer; 3-5-a reservoir unit; 3-5-1-airway; 3-5-2-umbrella cap; 3-5-3-effusion chassis; 3-6-a first demister; 3-7-a second demister; 4-a chimney; 5-a liquid storage device; 6-solution filtration conditioning system; 7-a water storage device; 8-a refrigeration device; 9-a sixth heat exchanger; 10-a first heat exchanger; 11-a second heat exchanger; 12-a third heat exchanger; 13-a fourth heat exchanger; 14-a compressor; 15-a saturator; 16-a fifth heat exchanger; 17-a flash tank; 18-regeneration system.
Detailed Description
The technical solutions of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," 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; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
Example 1
The embodiment provides a single-tower double-circulation energy-saving and whitening-able device, as shown in fig. 1 and 2, comprising a dust removal device 1, an economizer 2 and a flue gas purification device 3 which are sequentially communicated, wherein, for example, the dust removal device 1 can be an electric dust remover, the flue gas purification device 3 comprises a shell and further comprises,
the desulfurization section 3-2 and the absorption section 3-1 are arranged in the shell from bottom to top in sequence; the absorption section 3-1 can be an empty tower section or a packed tower section, and when the absorption section is the packed tower section, the packing can be a single layer or multiple layers; the top of the absorption section 3-1 is provided with a purified flue gas outlet;
a liquid storage unit 3-5 disposed between the desulfurization section 3-2 and the absorption section 3-1 and located in the casing to divide the desulfurization section 3-2 and the absorption section 3-1, the flue gas being adapted to pass from the desulfurization section 3-2 through the liquid storage unit 3-5 into the absorption section 3-1; specifically, as shown in fig. 3, 4, 5 and 6, the reservoir unit 3-5, including the liquid accumulation chassis 3-5-3, is adapted to be placed within the housing; the air duct 3-5-1 is arranged on the effusion chassis 3-5-3 at intervals, the air duct 3-5-1 extends to the absorption section 3-1, the flue gas enters the absorption section 3-1 from the desulfurization section 3-2 through the air duct 3-5-1, an umbrella cap 3-5-2 used for preventing the absorption liquid from being directly sprayed into the air duct 3-5-1 is arranged right above the flue gas outlet of the air duct 3-5-1, and a gap suitable for flue gas circulation is formed between the umbrella cap 3-5-2 and the flue gas outlet of the air duct 3-5-1; the liquid storage space is arranged above the liquid accumulation chassis 3-5-3, is positioned between the adjacent air ducts 3-5-1 or between the air ducts 3-5-1 and the inner wall of the shell and is used for receiving the sprayed absorption liquid;
the first spraying layer 3-3 is arranged between the absorption section 3-1 and the top end of the shell and is positioned in the shell, the liquid inlet end of the first circulating loop is communicated with the liquid storage unit 3-5, the liquid outlet end of the first circulating loop is communicated with the first spraying layer 3-3, and the first circulating loop is provided with a first heat exchanger 10 so as to cool the absorption liquid in the liquid storage unit 3-5 and send the absorption liquid into the first spraying layer 3-3 and spray the rising flue gas; specifically, as shown in fig. 2, the number of the first spraying layers 3-3 is 1-6, the first spraying units are arranged in the first spraying layers 3-3, and the number of the first spraying layers 3-3 is four, and the first spraying layers are divided into four layers and arranged at intervals; the liquid inlet end of the first circulation loop is communicated with the liquid storage space;
a second spraying layer 3-4 arranged between the flue gas inlet of the desulfurization section 3-2 and the liquid storage unit 3-5 and positioned in the shell, wherein the liquid inlet end of the second circulation loop is communicated with the bottom of the shell, the liquid outlet end of the second circulation loop is communicated with the second spraying layer 3-4 so as to send the desulfurization liquid in the bottom of the shell into the second spraying layer 3-4 and spray the ascending flue gas, specifically, as shown in fig. 2, the second spraying layer 3-4 is 1-8 layers, a second spraying unit is arranged in the second spraying layer 3-4, and 7 second spraying layers 3-4 are divided into 7 layers and are arranged at intervals;
more specifically, the first spraying unit and the second spraying unit respectively comprise spraying guide pipes and spraying nozzles arranged on the spraying guide pipes at intervals, and the first spraying unit and the second spraying unit are respectively close to the clean flue gas outlet of the absorption section 3-1 and the clean flue gas outlet of the desulfurization section 3-2, so that the countercurrent contact path is prolonged, and the heat in the flue gas can be effectively recovered.
In the single-tower double-circulation energy-saving and whitening-eliminating device, a desulfurization section and an absorption section are sequentially arranged in a shell of a flue gas purification device from bottom to top, a liquid storage unit is arranged between the desulfurization section and the absorption section, a first spraying layer is arranged between the absorption section and the top end of the shell, a second spraying layer is arranged between a flue gas inlet of the desulfurization section and the liquid storage unit, in the actual working process, flue gas enters the absorption section from the desulfurization section and is in countercurrent contact with concentrated solution (such as concentrated salt solution) or clear water sprayed on the top of the absorption section, in the heating season, the concentrated solution absorbs water in the flue gas and becomes thin, latent heat is released in the phase change process of the separated water, the flue gas and a salt solution are heated, the heated solution is collected by the liquid storage unit, heat exchange is carried out through a first heat exchanger on a first circulation loop, and the balance state in the absorption section is flexibly controlled by utilizing the quantity; in non-heating seasons, besides the concentrated solution, clear water can be used for spraying to cool the flue gas, and the saturated clean flue gas is cooled and separated out of water, so that the effect of water extraction is achieved, and the heated water can be recycled after heat exchange through a refrigerating device. Finally, the sensible heat of the original flue gas and the latent heat of the purified flue gas steam are deeply recovered and utilized by the means, the problem that a large amount of cold sources are needed for cooling and condensing the flue gas in the prior art is solved, and water resources are greatly saved. Meanwhile, the water in the clean flue gas is recovered, the system operation cost is reduced, the problems that colored smoke plumes are eliminated in a coal-fired power plant or other industries, and a deep water lifting system is only put into use and does not have income are solved, the environment-friendly effects of high efficiency, energy conservation, emission reduction and the like are achieved, and the method has good social and economic influences. Meanwhile, the desulfurization section and the absorption section are arranged in the same shell, so that the process flow is greatly simplified, and the equipment cost is reduced.
Further, the absorption tower further comprises a liquid storage device 5 which is arranged on the first circulation loop so as to store the absorption liquid in the absorption section 3-1 in the liquid storage device 5 in the non-heating season; in the heating season, the absorption liquid in the liquid storage device 5 is sent into the absorption section 3-1.
The liquid inlet end of the third circulation loop is communicated with the liquid storage device 5, the liquid outlet end of the third circulation loop is communicated with the first spraying layer 3-3, and the third circulation loop is provided with a solution filtering conditioning system 6 and a heat exchange device; specifically, the heat exchange device may be specifically a first heat exchanger 10; filtering and modulating the absorption liquid by a solution filtering and conditioning system 6; specifically, the solution filtering and conditioning system 6 consists of a cyclone and a filter which are sequentially communicated;
a liquid inlet end of the fourth circulation loop is communicated with the liquid storage device 5, a liquid outlet end of the fourth circulation loop is communicated with the first spraying layer 3-3, and a fourth heat exchanger 13 and a regeneration system 18 are sequentially arranged on the fourth circulation loop; specifically, as shown in fig. 7, the regeneration system 18 includes a flash tank 17, a dilute solution inlet is arranged in the middle of the regeneration system, a steam outlet is arranged at the upper part of the regeneration system, a concentrated solution outlet is arranged at the lower part of the regeneration system, the fifth heat exchanger 16 is communicated with the dilute solution inlet, and the concentrated solution outlet is communicated with the fourth heat exchanger 13, so that the absorption liquid after being sprayed with the flue gas enters the flash tank 17 for regeneration, and then exits from the concentrated solution outlet to enter the fourth heat exchanger 13 to exchange heat with the absorption liquid after being sprayed with the flue gas; the compressor 14 and the saturator 15, the steam outlet, the compressor 14, the saturator 15 and the fifth heat exchanger 16 are sequentially communicated, so that the absorption liquid after being sprayed with the flue gas and secondary steam exchange heat in the fifth heat exchanger 16 in a non-heating season and then enter the flash tank 17; the fourth heat exchanger 13 may be a plate heat exchanger.
In addition, as shown in fig. 2, the absorption section 3-1 is provided with an external circulation and an internal circulation, the external circulation is 1-2 layers, the internal circulation is 2-4 layers, the specific setting number is determined according to the project flue gas volume, each circulation layer is separately provided with a heat exchanger or a circulation pump, and the mobile equipment is reserved according to relevant specifications. The external circulation is responsible for system regeneration, and the internal circulation is responsible for absorbing the system equilibrium state. Specifically, the absorption liquid in the liquid storage device 5 is divided into three paths, namely a first circulation loop, a second circulation loop and a third circulation loop, wherein on the first circulation loop, the sprayed absorption liquid is subjected to heat exchange by a first heat exchanger 10 and then returns to the top end of the absorption section 3-1 to form a small circulation; on the second circulation loop, the sprayed absorption liquid is heated by the fourth heat exchanger 13 and then enters the regeneration system 18; on the third circulation loop, the sprayed absorption liquid enters a solution filtering and tempering system 6, on one hand, solid particles accumulated in the absorption section of the solution and generated substances such as crystal salt (sulfate, carbonate and the like) can be removed through a cyclone and a filtering device, so that pollutants and impurities in the solution in the absorption section are controlled to a certain degree; on the other hand, the calcium-based salt is added to adjust the pH value of the solution, maintain the absorption capacity of the solution and reduce the corrosivity of the solution. The absorption liquid enters from the top of the absorption section, and through uniform spraying and reverse convection of flue gas entering from the bottom of the absorption section, water vapor in the flue gas is absorbed by concentrated solution, and the spraying layer can be provided with a standby layer so as to improve the reliability of the absorption section. The water absorption capacity of the saline solution of unit mass can be controlled by adjusting the internal circulation solution amount of the absorption section, the concentration of the absorbed dilute solution is reduced by 1-10% relative to the concentration of the concentrated solution, and the ratio of the internal circulation amount to the regeneration circulation amount can be 1:1-10: 1.
In the heating season, the regeneration system uses the air extracted by a steam engine as a regeneration driving heat source; in non-heating seasons, a regeneration system (a compressor, a saturator, a plate heat exchanger and a flash tank) or a clear water spraying system or a combined system of the regeneration system and the clear water spraying system is adopted. Flue gas enters from the bottom of the desulfurization section for desulfurization and then enters from the bottom of the desulfurization section through a gas cap of the desulfurization section, as shown in fig. 3 and 4, the gas cap can be rectangular or circular, and specifically, the gas cap can be an umbrella cap 3-5-2. Clean flue gas after the desulfurization gets into the absorption section, and with the strong salt solution that the absorption section top sprayed against the current, the moisture becomes rare in the absorption section top strong salt solution absorption flue gas, separates out moisture phase transition in-process release latent heat, heats flue gas and salt solution, and the solution after the intensification is drawn forth through upper segment bottom hydrops chassis and is got into stock solution device.
The sprayed absorption liquid enters an evaporator for partial gasification, finally enters a flash tank for flash evaporation to remove absorbed moisture, the steam of a pump unit is adopted in the heating season of a driving heat source, and the quality of secondary steam is improved by adopting MVR (a compressor, a saturator, a plate heat exchanger and the flash tank) in the non-heating season. The primary steam condensate water can enter a third heat exchanger or a second heat exchanger for heat exchange according to the primary steam condensate water and the secondary steam temperature, and the primary steam condensate water after heat exchange returns to the boiler; the secondary steam evaporated can enter a second heat exchanger or a third heat exchanger for heat exchange, and secondary condensed water after heat exchange is used for supplementing water for the desulfurization process. And the concentrated solution from the bottom of the flash tank enters a fourth heat exchanger to exchange heat with the dilute solution and then is sent to the top of the absorption section for cyclic absorption. And (3) enabling the dilute solution heated by the concentrated solution to enter a fifth heat exchanger to be continuously heated (the heat source is steam of a pumping unit in a heating season), then carrying out flash evaporation by a flash tank, increasing the heating area by recovering the latent heat of clean smoke, enabling the extracted condensed water to enter a second heat exchanger or a third heat exchanger to exchange heat with heat supply network water in the heating season, and enabling secondary steam at the top of the flash tank to enter the third heat exchanger or the second heat exchanger to raise the heat supply network water to about 85 ℃ for heating.
Example 2
The embodiment provides a single-tower double-circulation energy-saving and whitening-capable device, which comprises a fifth circulation loop on the basis of the embodiment 1, wherein a liquid inlet end of the fifth circulation loop is communicated with a liquid storage unit 3-5, a liquid outlet end of the fifth circulation loop is communicated with a first spraying layer 3-3, and a water storage device 7 and a refrigerating device 8 are arranged on the fifth circulation loop, so that in non-heating seasons, water in the water storage device 7 is sent into the refrigerating device 8 for refrigeration and then sent into the first spraying layer 3-3 for circulating spraying of flue gas; in the heating season, water in the liquid storage unit 3-5 is stored in the water storage device 7; in this embodiment, the refrigerating device 8 is a water cooling tower or a closed mechanical draft cooling tower; the water storage device 7 is a clear water tank;
in non-heating seasons, the absorption section can also utilize clear water to spray to cool the flue gas, and the saturated clean flue gas is cooled and separated out water, thereby achieving the effect of water extraction. In non-heating seasons, absorbing liquid at the bottom of the absorbing section is completely discharged into a liquid storage device by using gravity height difference, a solution bypass of the absorbing section is closed, a clean water tank bypass is opened, clean water at the bottom of the absorbing section is delivered to the top of the tower by using a circulating water pump to be sprayed, the temperature of spraying water and flue gas rises after mass transfer and heat transfer in the absorbing section, condensed water enters circulating cooling water, and the cooling water after the temperature of the bottom of the absorbing section is raised is delivered to a refrigerating device to be cooled. The refrigerating device adopts a water cooling tower or a closed mechanical draft cooling tower, the heated circulating cooling water can be directly sent to the water cooling tower or the closed mechanical draft cooling tower, the water collected in the water cooling tower is taken away by air, the closed mechanical draft cooling tower cannot evaporate redundant condensed water, redundant moisture is removed before the condensed water enters the closed mechanical draft cooling tower, and the rest condensed water enters the mechanical draft cooling tower; the second method comprises the following steps: the heated circulating cooling water can exchange heat through a plate heat exchanger of the regeneration system, a refrigerant of the plate heat exchanger is from cooling water of a water cooling tower or a closed mechanical draft cooling tower, and the water with condensed water amount also needs to be removed before the heated circulating cooling water at the tower bottom enters the plate heat exchanger. The regeneration system is cut off in non-heating seasons, and circulating cooling water manufactured by a water cooling tower or a closed mechanical draft cooling tower is used for spray cooling in an absorption section, so that the environment-friendly requirement of dehumidification smoke plume elimination in the non-heating seasons of the power plant is met;
when there is no heating demand in non-heating seasons, if still need carry out flue gas lift water, regeneration system switches into MVR operational mode, and the secondary steam gets rid of from the flash tank top and gets into the compressor, becomes superheated steam through the pressure boost heating, becomes saturated steam through spraying, as flash tank drive heat source, becomes the condensate water after releasing latent heat, this condensate water again with heat supply network water heat transfer, can heat the heat supply network water (low condensation water that adds) to about 60 ℃, the condensate water after the cooling can be used to the defroster sparge water etc. of desulfurization section or absorption section. By the operation mode, the air exhaust energy consumption and the recovery energy consumption can be almost mutually offset in non-heating seasons, and the generating capacity of the unit is not negatively influenced.
Example 3
The embodiment provides a single-tower double-circulation energy-saving whitening device, which further comprises a second heat exchanger 11 and a third heat exchanger 12 on the basis of the embodiment 1 or 2, wherein the first heat exchanger 10, the second heat exchanger 11 and the third heat exchanger 12 are sequentially communicated, so that heat supply network incoming water or low-condensation water sequentially passes through the first heat exchanger 10, the second heat exchanger 11 and the third heat exchanger 12 and exchanges heat with substances entering the corresponding heat exchangers;
the fifth heat exchanger 16 is communicated with the second heat exchanger 11 and/or the third heat exchanger 12, so that the extracted air condensate water of the fifth heat exchanger 16 is fed into the second heat exchanger 11 and/or the third heat exchanger 12 for heat exchange, then is returned to the boiler for water supply, and the secondary steam condensate water of the fifth heat exchanger 16 is fed into the third heat exchanger 12 and/or the second heat exchanger 11 for heat exchange and then is used as process make-up water; the steam outlet is also communicated with the third heat exchanger 12 so as to send secondary steam into the third heat exchanger 12 for heat exchange.
Example 4
On the basis of the above embodiments 1, 2 or 3, the economizer 2 is communicated with the flue gas inlet of the desulfurization section 3-2, so that the flue gas enters the desulfurization section 3-2 after passing through the dust removal device 1 and the economizer 2 in sequence, and the third heat exchanger 12 is communicated with the economizer 2 to exchange heat between condensed water and the flue gas from the dust removal device 1 in the economizer 2;
the system also comprises a sixth heat exchanger 9 which is communicated with the fourth heat exchanger 13 and is used for exchanging heat of the concentrated solution after heat exchange in the fourth heat exchanger 13 in the sixth heat exchanger 9 again;
the smoke outlet at the top end of the shell is communicated with a chimney 4.
Example 5
The embodiment provides a single-tower double-circulation energy-saving whitening device, which further comprises a first demister 3-6 arranged between the first spraying layer 3-3 and the top end of the shell and positioned in the shell on the basis of the embodiments 1, 2, 3 or 4;
and second demisters 3-7 disposed between the second spray layers 3-4 and the liquid storage unit 3-5 and in the housing, as shown in fig. 2, the corresponding second demisters 3-7 may further be provided with spray layers to wash the corresponding first demisters 3-6 and second demisters 3-7.
Example 6
Based on the above embodiments 1, 2, 3, 4 or 5, as shown in fig. 3, 4, 5 and 6, the air duct 3-5-1 and the umbrella cap 3-5-2 in the liquid storage unit 3-5 may be rectangular or circular, if rectangular, one end of the rectangle is provided with a liquid discharge port through which the solution enters the liquid storage device or the water storage device, and the horizontal heights of the adjacent umbrella caps may be the same or different relative to the liquid accumulation chassis, that is, the heights of the air caps in each row may be different, so as to increase the flow area; if the air cap is a circular air cap, the air channel 3-5-1 is cylindrical, the air cap is also circular, the arrangement of the air cap rows can be staggered and regular, and the regular arrangement can reduce the solution circulation resistance. The length, width and diameter of the air duct 3-5-1 on the effusion chassis 3-5-3 can be designed according to the uniformity of entering the absorption section.
In addition, the specific working principle of the above device is as follows:
as figure 2, the absorption section arranges 2-6 layers according to the flue gas volume and sprays the layer, generally set up 2 layers of outer circulations, 3 layers of inner circulations, absorption section top strong salt solution absorbs the moisture in the flue gas and becomes rare, release latent heat among the phase transition process of separating out moisture, heating flue gas and salt solution, solution after the intensification passes through the plate heat exchanger heat transfer on each branch road of inner circulation, the equilibrium state in the heat size control absorption section is taken away in the utilization, the outer circulation is generally one-purpose one-ready, the outer circulation can carry the moisture that the absorption section absorbed to regeneration system and regenerate. Flue gas enters from the bottom of the desulfurization section, is desulfurized and then enters from a gas cap of the desulfurization section into the bottom of the absorption section, the gas cap can be rectangular or round and is in countercurrent with a strong brine solution sprayed from the top of the absorption section, the strong brine solution at the top of the absorption section absorbs the flue gas and becomes dilute, latent heat is released in the phase change process of precipitated moisture to heat the flue gas and a salt solution, the heated solution is led out through an effusion chassis at the bottom of the upper section and enters a liquid storage device, the solution in the liquid storage device is divided into three parts, the first part is sent to a heat supply network heat exchanger through a circulating pump to exchange heat with heat supply network water or low-added condensed water, and the dilute solution after heat exchange; the second part enters a solution tempering tank for tempering, and then is conveyed to a tempering pump to be mixed with the dilute solution of the circulating pump to enter a heat supply network heat exchanger; and the third part is sent to a dilute and concentrated solution heat exchanger by a dilute solution heat exchanger to exchange heat with concentrated solution, then enters a saturator to be partially gasified, finally enters a flash tank to flash off absorbed moisture, steam of a pump unit is adopted in a driving heat source heating season, and the quality of secondary steam is improved by adopting MVR in a non-heating season. The primary steam condensate water can enter a third-level or second-level heat exchanger of a heat supply network for heat exchange according to the primary steam condensate water and the temperature of the secondary steam, and the primary steam condensate water after heat exchange returns to the boiler; the secondary steam evaporated can enter a second-level or third-level heat exchanger of a heat supply network for heat exchange, and secondary condensed water after heat exchange is used for supplementing water for the desulfurization process. Concentrated solution from the bottom of the flash tank enters a dilute concentrated solution heat exchanger to exchange heat with dilute solution, and then is sent to the top of the absorption section for cyclic absorption. And (3) enabling the dilute solution heated by the concentrated solution to enter a plate heat exchanger to continuously raise the temperature (the heat source adopts pumping unit steam in the heating season), then carrying out flash evaporation by a flash tank, increasing the heating area by recovering the latent heat of the purified smoke, during the heating season, pumping condensed water to enter a heat supply network secondary heat exchanger or a heat supply network tertiary heat exchanger to exchange heat with heat supply network water, and enabling secondary steam at the top of the flash tank to enter the heat supply network tertiary heat exchanger or the heat supply network secondary heat exchanger to raise the heat supply network water to about 85 ℃ for heating.
When there is not heating demand in non-heating season, if still need carry out the flue gas and carry out the water, then regeneration system switches into MVR operational mode, and the entering compressor is got rid of from the regenerator top to the secondary steam, becomes superheated steam through the pressure boost heats, becomes saturated steam through spraying, as regenerator drive heat source, becomes the condensate water after releasing latent heat, this condensate water again with heat supply network water heat transfer, can heat the heat supply network water (low condensation water that adds) to about 60 ℃, the condensate water after the cooling can be used to desulfurizing tower defroster sparge water etc.. By the operation mode, the air exhaust energy consumption and the recovery energy consumption can be almost mutually offset in non-heating seasons, and the generating capacity of the unit is not negatively influenced.
In non-heating seasons, the absorption section can utilize clear water to spray to cool flue gas, and the saturated clean flue gas is cooled and separated out water, thereby achieving the effect of water lifting. For the absorption section, in the non-heating season, the absorption section at the bottom of the absorption section is completely discharged into a liquid storage device or a water storage device by using the gravity of the height difference, a solution bypass of the absorption section is closed, a clean water tank bypass is opened, clean water at the bottom of the absorption section is delivered to the top of the tower by using a circulating water pump for spraying, the temperature of spray water and flue gas is increased after mass transfer and heat transfer in the absorption section, condensed water enters circulating cooling water, and the cooling water after the temperature of the bottom of the absorption section is increased is delivered to a refrigerating device for cooling. The refrigerating device adopts a water cooling tower or a closed mechanical draft cooling tower, the heated circulating cooling water can be directly sent to the water cooling tower or the closed mechanical draft cooling tower, the water collected in the water cooling tower is taken away by air, the closed mechanical draft cooling tower cannot evaporate redundant condensed water, redundant moisture is removed before the condensed water enters the closed mechanical draft cooling tower, and the rest condensed water enters the mechanical draft cooling tower; the second method comprises the following steps: the heated circulating cooling water can exchange heat through a plate heat exchanger of the regeneration system, a refrigerant of the plate heat exchanger is from cooling water of a water cooling tower or a closed mechanical draft cooling tower, and condensed water also needs to be removed before the heated circulating cooling water at the tower bottom enters the plate heat exchanger.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.
Claims (10)
1. A single-tower double-circulation energy-saving whitening device comprises a flue gas purification device, the flue gas purification device comprises a shell, and is characterized by also comprising,
the desulfurization section and the absorption section are sequentially arranged in the shell from bottom to top;
a liquid storage unit arranged between the desulfurization section and the absorption section and positioned in the shell to divide the desulfurization section and the absorption section, wherein the flue gas is suitable for passing through the liquid storage unit from the desulfurization section to the absorption section;
the first spraying layer is arranged between the absorption section and the top end of the shell and positioned in the shell, the liquid inlet end of a first circulating loop is communicated with the liquid storage unit, the liquid outlet end of the first circulating loop is communicated with the first spraying layer, and a first heat exchanger is arranged on the first circulating loop so as to cool the absorption liquid in the liquid storage unit and send the absorption liquid into the first spraying layer and spray the rising flue gas;
and the second spraying layer is arranged between the flue gas inlet of the desulfurization section and the liquid storage unit and is positioned in the shell, the liquid inlet end of the second circulation loop is communicated with the bottom of the shell, and the liquid outlet end of the second circulation loop is communicated with the second spraying layer so as to send the desulfurization liquid in the bottom of the shell into the second spraying layer and spray the rising flue gas.
2. The device of claim 1, wherein the reservoir unit comprises,
a liquid accumulation chassis adapted to be placed within the housing;
the air duct is arranged on the effusion chassis at intervals, extends to the absorption section, and is used for enabling the flue gas to enter the absorption section from the desulfurization section through the air duct;
and the liquid storage space is arranged above the liquid accumulation chassis, is positioned between adjacent air ducts or between the air ducts and the inner wall of the shell and is used for receiving the sprayed absorption liquid.
3. The apparatus of claim 2, further comprising,
the liquid storage device is arranged on the first circulation loop so as to store the absorption liquid in the absorption section in the liquid storage device in a non-heating season; and in the heating season, the absorption liquid in the liquid storage device is sent into the absorption section.
4. The apparatus of claim 3, further comprising,
a liquid inlet end of the third circulation loop is communicated with the liquid storage device, a liquid outlet end of the third circulation loop is communicated with the first spraying layer, and a solution filtering conditioning system and a heat exchange device are arranged on the third circulation loop;
and the liquid inlet end of the fourth circulation loop is communicated with the liquid storage device, the liquid outlet end of the fourth circulation loop is communicated with the first spraying layer, and a fourth heat exchanger and a regeneration system are sequentially arranged on the fourth circulation loop.
5. The apparatus of claim 4, wherein the regeneration system comprises
The middle part of the flash tank is provided with a dilute solution inlet, the upper part of the flash tank is provided with a steam outlet, the lower part of the flash tank is provided with a concentrated solution outlet, a fifth heat exchanger is communicated with the dilute solution inlet, and the concentrated solution outlet is communicated with the fourth heat exchanger, so that the absorption liquid sprayed with the flue gas enters the flash tank for regeneration, comes out of the concentrated solution outlet and enters the fourth heat exchanger to exchange heat with the absorption liquid sprayed with the flue gas;
the steam outlet, the compressor, the saturator and the fifth heat exchanger are communicated in sequence, so that absorption liquid after being sprayed with the flue gas and secondary steam exchange heat in the fifth heat exchanger in a non-heating season and then enter the flash tank.
6. The apparatus of claim 5, further comprising,
a fifth circulation loop, wherein the liquid inlet end of the fifth circulation loop is communicated with the liquid storage unit, the liquid outlet end of the fifth circulation loop is communicated with the first spraying layer, and a water storage device and a refrigerating device are arranged on the fifth circulation loop, so that in non-heating seasons, water in the water storage device is sent into the refrigerating device for refrigeration and then sent into the first spraying layer for circulating spraying of flue gas; in the heating season, the water in the liquid storage unit is stored in the water storage device.
7. The apparatus of claim 6, further comprising,
the first heat exchanger, the second heat exchanger and the third heat exchanger are communicated in sequence, so that incoming water or low-condensed water of a heat supply network sequentially passes through the first heat exchanger, the second heat exchanger and the third heat exchanger and exchanges heat with substances entering the corresponding heat exchangers;
the fifth heat exchanger is communicated with the second heat exchanger and/or the third heat exchanger, so that the extracted air condensate water of the fifth heat exchanger is fed into the second heat exchanger and/or the third heat exchanger for heat exchange and then returned to the boiler for water supply, and the secondary steam condensate water of the fifth heat exchanger is fed into the third heat exchanger and/or the second heat exchanger for heat exchange and then is used as process make-up water;
the steam outlet is also communicated with the third heat exchanger so as to send secondary steam into the third heat exchanger for heat exchange.
8. The device according to claim 7, further comprising a dust removal device and an economizer which are sequentially communicated, wherein the economizer is communicated with the flue gas inlet of the desulfurization section, so that flue gas enters the desulfurization section after sequentially passing through the dust removal device and the economizer, and the third heat exchanger is communicated with the economizer so as to exchange heat between condensed water and the flue gas from the dust removal device in the economizer.
9. The apparatus of any one of claims 1-7, further comprising,
the first demister is arranged between the first spraying layer and the top end of the shell and is positioned in the shell;
and the second demister is arranged between the second spraying layer and the liquid storage unit and is positioned in the shell.
10. The device of any one of claims 2 to 8, wherein the level of adjacent caps differs relative to the liquid accumulation tray;
and a smoke outlet at the top end of the shell is communicated with a chimney.
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| CN111578558A (en) * | 2020-06-18 | 2020-08-25 | 昊姆（上海）节能科技有限公司 | Multistage heat pump coupling flue gas waste heat recovery system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111578558A (en) * | 2020-06-18 | 2020-08-25 | 昊姆（上海）节能科技有限公司 | Multistage heat pump coupling flue gas waste heat recovery system |
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