CN215062173U - Flue gas heat multiple-effect utilization system - Google Patents
Flue gas heat multiple-effect utilization system Download PDFInfo
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- CN215062173U CN215062173U CN202120769571.7U CN202120769571U CN215062173U CN 215062173 U CN215062173 U CN 215062173U CN 202120769571 U CN202120769571 U CN 202120769571U CN 215062173 U CN215062173 U CN 215062173U
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Abstract
The utility model provides a flue gas heat multiple-effect utilizes system, include: air heater, heat medium water circulating system and hot user's system, heat medium water circulating system includes: flue gas cooler, hot media water circulating pump, circulating line, set up heater and/or the water cooling plant that condenses, first throttling element, second throttling element and the controller on circulating line, the flue gas of air heater exit gets into flue gas cooler, and flue gas cooler releases the flue gas heat for circulating line, and hot user system includes: the secondary air heater is respectively connected with the circulating pipeline and the air preheater, and the controller is used for controlling the first throttling element to be opened when the water temperature of the hot medium water inlet of the flue gas cooler is greater than or equal to a first preset temperature; the controller is also used for controlling the second throttling element to be closed when the water temperature of the heat medium water inlet of the flue gas cooler is less than or equal to a second preset temperature, so that the heat of the flue gas can be comprehensively utilized in multiple effects, and the coal consumption is reduced.
Description
Technical Field
The utility model relates to a boiler control technical field, concretely relates to flue gas heat multiple-effect utilizes system.
Background
In order to realize the aim of carbon neutralization in China as expected, energy conservation, emission reduction and reduction of coal consumption of coal-fired boilers are imperative. With the increasing demand for environmental protection, various environmental protection technologies are continuously applied in power plants, and it is also necessary to reduce environmental protection and energy consumption while achieving environmental protection effect.
Along with the continuous deepening of energy saving and consumption reduction of a power plant, the residual heat of the exhaust smoke of the air preheater of the boiler is greatly recycled, and various schemes for utilizing the waste heat of the exhaust smoke appear. However, there are the following problems: the waste heat of the flue gas cannot be fully utilized; the life of the equipment is impaired; the adjustment is difficult and complicated; single use, poor applicability and the like.
SUMMERY OF THE UTILITY MODEL
The utility model provides a solve above-mentioned technical problem, provide a flue gas heat multiple-effect utilizes system, can utilize the flue gas waste heat completely to maintain the relevant equipment of higher exhaust gas temperature protection, and adjust simply, the flue gas waste heat still can be used for saving coal, waste water zero release, the multipurpose such as flue gas disappears simultaneously, and the suitability is stronger.
The utility model adopts the technical scheme as follows:
a multi-effect utilization system for flue gas heat comprises: air heater, heat medium water circulating system and hot user's system, heat medium water circulating system includes: flue gas cooler, hot media water circulating pump, circulation pipeline, setting are in heater and/or the water cooling device that condenses on the circulation pipeline, with the first throttling element that the water cooling device that condenses links to each other, with second throttling element and controller that the heater links to each other, flue gas at air heater exit gets into the flue gas cooler, the flue gas cooler with the release of flue gas heat for circulation pipeline, hot user system includes: the secondary air heater is respectively connected with the circulating pipeline and the air preheater, wherein the controller is used for controlling the first throttling element to be opened when the water temperature of a hot medium water inlet of the flue gas cooler is greater than or equal to a first preset temperature so as to enable the condensed water cooling device to work, absorb the heat of hot medium water in the hot medium water circulating system and reduce the temperature of the hot medium water; the controller is also used for controlling the second throttling element to be closed when the water temperature of the heat medium water inlet of the flue gas cooler is smaller than or equal to a second preset temperature, so that the heater works, and the temperature of the heat medium water in the heat medium water circulation system is increased.
Specifically, the first end of the condensation water cooling device is connected with the outlet end of the flue gas cooler, the second end of the condensation water cooling device is connected with the condensation water outlet end of the thermodynamic system, and the third end of the condensation water cooling device is connected with the condensation water inlet end of the thermodynamic system so as to absorb the heat of the thermal medium water in the thermal medium water circulation system by using the condensation water of the thermodynamic system and reduce the temperature of the thermal medium water.
Specifically, a first end of the heater is connected with an outlet end of the heat medium water circulating water pump, a second end of the heater is connected with an outlet end of hot steam or hot water of the thermodynamic system, and a third end of the heater is connected with an inlet end of the hot steam or hot water of the thermodynamic system, so that the temperature of the heat medium water in the heat medium water circulating system is increased by using the hot steam or hot water of the thermodynamic system.
Specifically, the hot user system further includes: one or more of a primary air heater, a purified flue gas heater, a wastewater flash evaporation concentration device and a heat exchange device, wherein one end of the primary air heater is connected with the circulating pipeline, the other end of the primary air heater is connected with the air preheater, and the purified flue gas heater, the wastewater flash evaporation concentration device and the heat exchange device are respectively connected with the heat medium water circulating system; and the controller is also used for controlling the corresponding throttling element to be opened when receiving a heating request of the primary air heater and/or the secondary air heater and/or the clean flue gas heater and/or the wastewater flash evaporation concentration device and/or the heat exchange device so as to heat the heat user system by using the heat medium water in the circulating pipeline.
Specifically, the heater includes: a first heater disposed at an outlet of the flue gas cooler; the second heater is arranged at the inlet or the outlet of the heat medium water circulating pump; the controller is further used for controlling the throttling elements corresponding to the first heater and/or the second heater according to the water temperature of the hot medium water inlet of the flue gas cooler.
Further, the above-mentioned flue gas heat multiple-effect utilizes system still includes: a bypass flue gas system, the bypass flue gas system comprising: the boiler comprises a bypass flue, a feed water heat exchanger and a condensed water heat exchanger, wherein the feed water heat exchanger and the condensed water heat exchanger are arranged on the bypass flue, the first end of the feed water heat exchanger is connected with an outlet of a boiler through the bypass flue, the second end of the feed water heat exchanger is connected with an outlet end of feed water of a thermodynamic system, the third end of the feed water heat exchanger is connected with an inlet end of the feed water of the thermodynamic system, and the fourth end of the feed water heat exchanger is connected with the first end of the condensed water heat exchanger through the bypass flue; the first end of the condensed water heat exchanger is connected with the fourth end of the feed water heat exchanger through the bypass flue, the second end of the condensed water heat exchanger is connected with the condensed water outlet end of the thermodynamic system, the third end of the condensed water heat exchanger is connected with the condensed water inlet end of the thermodynamic system, and the fourth end of the condensed water heat exchanger is connected with the outlet flue of the air preheater.
Specifically, the flue gas cooler is arranged at the inlet of the dust remover and/or the inlet of the desulfurization absorption tower.
The utility model has the advantages that:
(1) for working conditions in summer, because the ambient temperature is high, in order to ensure that the temperature of cold air at the inlet of the air preheater is not raised, the heat which needs to be absorbed by the cold air at the inlet of the air preheater is reduced compared with that in spring, in order to balance the heat of a heat medium water system, a condensed water cooling device is operated, condensed water from a turbine thermodynamic system is heated by the heat medium water and then returns to an original system, steam is extracted by extrusion, the heat consumption of the turbine is reduced, the coal consumption of a unit is further reduced, and because the temperature of the cold air at the inlet of the air preheater is not raised in summer, the temperature of flue gas at the outlet of the air preheater and the inlet of a dust remover can be ensured not to be raised;
(2) for working conditions in winter, the ambient temperature is low, so that the temperature of cold air at the inlet of the air preheater is not reduced, the cold air at the inlet of the air preheater needs to absorb more heat, the heater is operated to balance the heat of a heating medium water system, and the temperature of the cold air at the inlet of the air preheater is not reduced, so that the temperature of smoke discharged from a boiler and the temperature of smoke at the inlet of a dust remover are not reduced, and a series of problems of ash blockage of the air preheater, corrosion of a cold end, corrosion of the dust remover and a downstream flue and the like are effectively prevented;
(3) the heater and the cooling device are arranged in the heat medium water circulation system, the heat of the heat medium water system is supplemented or absorbed according to the change of the environmental temperature, and the effect of keeping the temperature of cold air at the inlet of the air preheater constant is achieved through a water side adjusting mode, so that the effect of ensuring the temperature of the exhaust gas of the boiler to be constant is achieved;
(4) the hot water is used as a circulating medium, various users are arranged in parallel, a certain user can be operated simultaneously or independently, the water-saving water heater can be used for heating water/domestic hot water, and the energy consumption input of each user can be flexibly adjusted according to the characteristics of different users and the change of environmental temperature.
Drawings
Fig. 1 is a schematic view of a multi-effect flue gas heat utilization system according to an embodiment of the present invention;
fig. 2 is a schematic view of a multi-effect utilization system for flue gas heat according to an embodiment of the present invention;
FIG. 3 is a schematic view of a multi-effect flue gas heat utilization system according to another embodiment of the present invention;
fig. 4 is a schematic diagram of a flue gas heat multiple-effect utilization system according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. 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.
Fig. 1 is a schematic view of a multiple-effect flue gas heat utilization system according to an embodiment of the present invention.
As shown in fig. 1, the multiple-effect flue gas heat utilization system of the embodiment of the present invention may include: an air preheater 10, a heating medium water circulation system 20 and a heat consumer system 30.
Wherein, the heat medium water circulation system 20 may include: the flue gas cooler 21, the hot water circulating pump 22, the circulating pipeline, the heater 23 and/or the condensed water cooling device 24 arranged on the circulating pipeline, the first throttling element K1 connected with the condensed water cooling device 24, the second throttling element K2 connected with the heater 23 and a controller (not specifically shown in the figure), wherein the flue gas at the outlet of the air preheater 10 enters the flue gas cooler 21, and the flue gas cooler 21 releases the heat of the flue gas to the circulating pipeline. The hot user system 30 may include: the secondary air heater 31 and the secondary air heater 31 are respectively connected with the circulating pipeline and the air preheater 10, wherein the controller is used for controlling the first throttling element K1 to be opened when the water temperature of the hot medium water inlet of the flue gas cooler 21 is greater than or equal to a first preset temperature, so that the condensed water cooling device 24 works, and the temperature of the hot medium water in the hot medium water circulating system 20 is reduced; the controller is also used for controlling the second throttling element K2 to be closed when the water temperature of the heat medium water inlet of the flue gas cooler 21 is less than or equal to a second preset temperature, so that the heater 23 works, and the temperature of the heat medium water in the heat medium water circulation system 20 is increased. The first preset temperature and the second preset temperature can be calibrated according to actual conditions.
It should be noted that the flue gas cooler 21 has four ends, two ends are a flue gas inlet and a flue gas outlet, and two ends are a hot water inlet and a hot water outlet, as shown in fig. 1, the hot water inlet and the hot water outlet of the flue gas cooler 21 form a closed cycle (the positions shown by arrows in the figure are the hot water inlet and the hot water outlet of the flue gas cooler).
In an embodiment of the present invention, the first end of the condensed water cooling device 24 is connected to the outlet end of the flue gas cooler 21, the second end of the condensed water cooling device 24 is connected to the condensed water outlet end of the thermal system, and the third end of the condensed water cooling device 24 is connected to the condensed water inlet end of the thermal system, so that the condensed water of the thermal system is used to absorb the heat of the hot medium water in the hot medium water circulation system 20, thereby reducing the temperature of the hot medium water.
In an embodiment of the present invention, the first end of the heater 23 is connected to the outlet end of the heat medium water circulation pump 22, the second end of the heater 23 is connected to the hot steam or hot water outlet end of the thermal system, and the third end of the heater 23 is connected to the hot steam or hot water inlet end of the thermal system, so as to increase the temperature of the heat medium water in the heat medium water circulation system 20 by using the hot steam or hot water of the thermal system.
Specifically, a temperature sensor is provided at the hot water inlet of the flue gas cooler 21 to detect the temperature of the hot water at the hot water inlet of the flue gas cooler 21, and whether to operate the heater 23 or the condensed water cooling device 24 is determined based on the temperature of the hot water at the hot water inlet of the flue gas cooler 21. For example, when the water temperature at the hot medium water inlet of the flue gas cooler 21 is greater than or equal to a first preset temperature, it indicates that the current working condition is summer, and the ambient temperature in summer is high, which causes the temperature of cold air at the inlet of the air preheater 10 to rise, so that the exhaust gas temperature of the boiler and the inlet flue gas temperature of the dust remover to rise, the excessive exhaust gas temperature causes the residual heat of the flue gas in summer to be not fully utilized, and the excessive inlet flue gas temperature of the dust remover affects the dust removal efficiency of the dust remover, which causes the increase of dust emission. Therefore, in order to ensure that the temperature of the cold air at the inlet of the air preheater 10 is not raised, the heat which needs to be absorbed by the cold air at the inlet of the air preheater 10 is reduced compared with the heat in spring, in order to balance the heat of the heat medium water system, the condensed water cooling device 24 is operated, the condensed water from the turbine thermodynamic system is heated by the heat medium water and then returns to the turbine thermodynamic system, the steam is extracted by extrusion, the heat consumption of the turbine is reduced, the coal consumption of a unit is further reduced, and because the temperature of the cold air at the inlet of the air preheater 10 is not raised in summer, the temperature of the smoke at the outlet of the air preheater 10 and the temperature of the smoke at the inlet of the dust remover can be ensured not raised. Compared with the prior art, the flue gas waste heat in 1/3 time periods (summer) all the year can be fully utilized, the coal consumption of the unit is further reduced, and the average coal consumption of the weighted unit all the year is reduced. It can be understood that the heat of the flue gas released by the flue gas cooler 21 is not affected by seasonal changes and is a constant value, for the working condition in summer, because the ambient temperature is high, the cold air at the inlet of the air preheater 10 needs to absorb less heat, in order to balance the heat of the heat medium water system, the condensed water cooling device 24 is operated, the condensed water from the turbine thermodynamic system is heated by the heat medium water and then returns to the original system, the steam is extracted by extrusion, the heat consumption of the turbine is reduced, and the coal consumption of the unit is further reduced.
For another example, when the temperature of the hot water at the hot water inlet of the flue gas cooler 21 is less than or equal to the second preset temperature, it indicates that the current working condition is in winter, and the ambient temperature in winter is low, which causes the temperature of the cold air at the inlet of the air preheater 10 to decrease, so that the temperature of the flue gas at the exhaust of the boiler and the temperature of the flue gas at the inlet of the dust remover to decrease, which causes a series of problems such as ash blockage of the air preheater 10, corrosion of the cold end, corrosion of the dust remover and the downstream flue, and affects the operation reliability and the service life of the equipment. Therefore, in order to ensure that the temperature of the cold air at the inlet of the air preheater 10 is not reduced, the cold air at the inlet of the air preheater 10 needs to absorb more heat, and in order to balance the heat of the heating medium water system, the heater 23 is operated to ensure that the temperature of the cold air at the inlet of the air preheater 10 is not reduced, so that the temperature of the exhaust gas of the boiler and the temperature of the flue gas at the inlet of the dust remover are not reduced, and a series of problems of ash blockage of the air preheater, cold end corrosion, corrosion of the dust remover and a downstream flue and the like are effectively prevented.
In addition, for the existing flue gas deep waste heat utilization technology, because the temperature of the flue gas entering the dust remover is influenced by the ambient temperature, and the temperature of the inlet flue gas required by the dust remover is constant, the system can continuously adjust the flow of the flue gas of the bypass part to control the variation range of the temperature of the inlet flue gas of the dust remover to be within an allowable range. Because the adjustment of the flue gas flow has hysteresis, the adjustment precision is limited, and the adjustment can not be accurately carried out according to the environmental temperature and the unit load, the actual operation has deviation, the operation effect is poor, and the effect of fully saving energy can not be achieved. Therefore, the utility model discloses a set up heater 23 and the water cooling device 24 that condenses in heat medium water circulating system 20, to ambient temperature's change, adopt the heat that supplements or absorb heat medium water system, through the mode that the water side was adjusted, reach the effect that maintains air heater 10 import cold wind constancy of temperature to guarantee the invariable effect of boiler exhaust gas temperature. Compared with the prior art of adjusting the flue gas flow of the bypass part, the water side adjusting mode has the advantages of simplicity, reliability, small hysteresis and the like.
It should be noted that whether to operate the heater 23 or the condensed water cooling device 24 may be determined by the temperature of the water at the heat medium inlet of the flue gas cooler 21, or may be determined by the temperature at the inlet of the heat medium circulation water pump 22, the temperature at the outlet of the heat medium circulation water pump 22, or the like.
According to an embodiment of the present invention, as shown in fig. 2, the hot user system 30 may further include: one or more of a primary air heater 32, a purified flue gas heater 33, a wastewater flash evaporation concentration device 34 and a heat exchange device 35, wherein one end of the primary air heater 32 is connected with a circulation pipeline, the other end of the primary air heater 32 is connected with the air preheater 10, and the purified flue gas heater 33, the wastewater flash evaporation concentration device 34 and the heat exchange device 35 are respectively connected with the heat medium water circulation system 20; the controller is also used for controlling the corresponding throttling elements to be opened when a heating request of the primary air heater 32 and/or the secondary air heater 31 and/or the clean flue gas heater 33 and/or the waste water flash concentration device 34 and/or the heat exchange device 35 is received, so that the heating medium water in the circulating pipeline is utilized for heating.
Specifically, high-temperature heat medium water is led out from the heat medium water circulation system 20 to heat primary cold air (primary air heater 32) and/or secondary cold air (secondary air heater 31), purified flue gas (purified flue gas heater 33), desulfurization wastewater (wastewater flash evaporation concentration device 34) and hot water (heat exchange device 35), and the heat medium water after heat release by a hot user returns to the heat medium water circulation system 20. The heated cold primary air and cold secondary air maintain constant air temperature and are not influenced by seasonal changes and environmental temperature, and the cold primary air and the cold secondary air are heated and then enter the rotary air preheater 10 to be heated again and finally sent into a hearth of the boiler. For example, when the clean flue gas at the inlet of the chimney of the power plant is considered to be provided with the clean flue gas heater 33 for flue gas whitening, high-temperature heat medium water can be led out from the heat medium water circulation system 20, heat is released by the clean flue gas heater 33 and then returns to the heat medium water circulation system 20, and the clean flue gas is heated by the clean flue gas heater 33 to achieve the whitening effect and then is discharged; for another example, when the power plant desulfurization wastewater adopts the flash evaporation zero-emission process, high-temperature heat medium water can be led out from the heat medium water system, heat is released by the wastewater flash evaporation concentration device 34 and then returns to the heat medium water circulation system 20, and the desulfurization wastewater is heated by the flash evaporation concentration device 34 and then enters the flash evaporation treatment system for concentration treatment, so that the zero emission of the desulfurization wastewater is realized; for another example, when there is a demand for hot water cooling/heating/domestic hot water in the surroundings, high-temperature hot water may be drawn from the hot water system, discharged through the heat exchanger 35, and returned to the hot water circulation system 20, and low-temperature water from the surrounding users may be heated by the heat exchanger and returned to the hot users.
Wherein, can select air heater 32 once according to actual conditions, overgrate air heater 31, clean flue gas heater 33, waste water flash distillation enrichment facility 34, heat transfer device 35, a plurality of devices adopt parallelly connected mode to set up, can guarantee like this that can not receive the influence each other, and, can increase the device at will on former system, only need with relevant tube coupling can, the suitability is stronger, has made things convenient for future transformation of power plant, for example, has adopted the utility model is used for the power plant of economize on coal usage, follow-up needs increase the flue gas and disappear white scheme, only need follow existing heat medium water system to draw out one kind of heat medium water pipeline supply to disappear white system can, little to current system's influence.
According to an embodiment of the present invention, as shown in fig. 3, the heater 23 includes: a first heater 231 provided at the outlet of the flue gas cooler 21; a second heater 232 provided at an inlet of the heat medium water circulation pump 22; and the controller is also used for controlling the throttling elements corresponding to the first heater 231 and/or the second heater 232 according to the water temperature of the hot medium water inlet of the flue gas cooler 21.
That is, the heater 23 may include one or more heaters, when the temperature is very low and one heater cannot meet the requirement, two heaters may be provided, and the heater may be provided in a manner that only one heat medium water pipeline leading from the existing heat medium water system is needed for supplying the heater. When the water temperature of the hot medium water inlet of the flue gas cooler 21 is far lower than the second preset temperature, the throttling element corresponding to the first heater and the throttling element corresponding to the second heater can be controlled to be closed simultaneously, so that the heaters start to work, the heat source of the heaters comes from steam or hot water at a certain position around, the temperature of the hot medium water is increased, and the requirements of various heat consumption users are met.
With continued reference to fig. 3, according to an embodiment of the present invention, the above-mentioned multiple-effect flue gas heat utilization system may further include: a bypass flue gas system 40, the bypass flue gas system 40 may comprise: the boiler comprises a bypass flue, a feed water heat exchanger 41 and a condensed water heat exchanger 42, wherein the feed water heat exchanger 41 is arranged on the bypass flue, the first end of the feed water heat exchanger 41 is connected with an outlet of the boiler through the bypass flue, the second end of the feed water heat exchanger 41 is connected with a feed water outlet end of a thermodynamic system, the third end of the feed water heat exchanger 41 is connected with a feed water inlet end of the thermodynamic system, and the fourth end of the feed water heat exchanger 41 is connected with the first end of the condensed water heat exchanger 42 through the bypass flue; the second end of the condensed water heat exchanger 42 is connected with the condensed water outlet end of the thermodynamic system, the third end of the condensed water heat exchanger 42 is connected with the condensed water inlet end of the thermodynamic system, and the fourth end of the condensed water heat exchanger 42 is connected with the outlet flue of the air preheater 10.
Specifically, a part of the bypass flue gas is extracted from the main flue before entering the air preheater 10, and the part of the bypass flue gas does not pass through the air preheater 10 and does not participate in the heat exchange between the flue gas and the air. The part of flue gas exchanges heat with feed water (feed water heat exchanger) and condensed water (condensed water heat exchanger) in sequence to heat the feed water and the condensed water from a turbine thermodynamic system of the unit, and the feed water and the condensed water are heated and then return to the original system. Therefore, the steam can be extracted by extrusion, the heat consumption of the steam turbine is reduced, and the coal consumption of the unit is reduced. In addition, because the air temperature at the inlet of the air preheater 10 in the system is kept constant (not influenced by seasonal changes), the proportion of the bypass flue gas is not changed, and the flow of the bypass flue gas does not need to be adjusted.
According to one embodiment of the present invention, as shown in fig. 3, a flue gas cooler 21 is provided at the inlet of the dust collector and/or at the inlet of the desulfurization absorption tower.
In an embodiment of the present invention, as shown in fig. 4, two units can share the same heat medium system and/or the same bypass flue gas system, so that the cost can be saved.
Additionally, in some embodiments of the present invention, the fuel of the boiler is coal, or combustible gas, or oil; the boiler is a pulverized coal boiler or a circulating fluidized bed boiler.
To sum up, the utility model discloses flue gas heat multiple-effect utilizes system, to summer operating mode, because ambient temperature is high, for guaranteeing that air heater import cold wind temperature does not rise, the cold wind of air heater import needs the heat that absorbs to reduce when comparing in spring, for the heat of balanced hot media water system, the cooling device of condensation water runs, after the condensate water that comes from among the steam turbine thermodynamic system is heated by hot media water, return original system, the exhaust steam of crowding, reduce the steam turbine heat consumption, further reduce the unit coal consumption, because air heater import cold wind temperature does not rise when summer, can guarantee that the flue gas temperature of air heater export and dust remover entry does not rise; for working conditions in winter, the ambient temperature is low, so that the temperature of cold air at the inlet of the air preheater is not reduced, the cold air at the inlet of the air preheater needs to absorb more heat, the heater is operated to balance the heat of a heating medium water system, and the temperature of the cold air at the inlet of the air preheater is not reduced, so that the temperature of smoke discharged from a boiler and the temperature of smoke at the inlet of a dust remover are not reduced, and a series of problems of ash blockage of the air preheater, corrosion of a cold end, corrosion of the dust remover and a downstream flue and the like are effectively prevented; the heater and the cooling device are arranged in the heat medium water circulation system, the heat of the heat medium water system is supplemented or absorbed according to the change of the environmental temperature, and the effect of keeping the temperature of cold air at the inlet of the air preheater constant is achieved through a water side adjusting mode, so that the effect of ensuring the temperature of the exhaust gas of the boiler to be constant is achieved; the hot water is used as a circulating medium, various users are arranged in parallel, a certain user can be operated simultaneously or independently, the water-saving water heater can be used for heating water/domestic hot water, and the energy consumption input of each user can be flexibly adjusted according to the characteristics of different users and the change of environmental temperature.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. The meaning of "plurality" is two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (7)
1. A multi-effect utilization system for flue gas heat is characterized by comprising: air heater, heat medium water circulating system and hot user's system, heat medium water circulating system includes: flue gas cooler, hot media water circulating pump, circulation pipeline, setting are in heater and/or the water cooling device that condenses on the circulation pipeline, with the first throttling element that the water cooling device that condenses links to each other, with second throttling element and controller that the heater links to each other, flue gas at air heater exit gets into the flue gas cooler, the flue gas cooler with the release of flue gas heat for circulation pipeline, hot user system includes: a secondary air heater connected with the circulation pipeline and the air preheater respectively, wherein,
the controller is used for controlling the first throttling element to be opened when the water temperature of the heat medium water inlet of the flue gas cooler is greater than or equal to a first preset temperature, so that the condensed water cooling device works, the heat of the heat medium water in the heat medium water circulation system is absorbed, and the temperature of the heat medium water is reduced;
the controller is also used for controlling the second throttling element to be closed when the water temperature of the heat medium water inlet of the flue gas cooler is smaller than or equal to a second preset temperature, so that the heater works, and the temperature of the heat medium water in the heat medium water circulation system is increased.
2. The multiple-effect flue gas heat utilization system as claimed in claim 1, wherein a first end of the condensed water cooling device is connected with an outlet end of the flue gas cooler, a second end of the condensed water cooling device is connected with a condensed water outlet end of the thermodynamic system, and a third end of the condensed water cooling device is connected with a condensed water inlet end of the thermodynamic system, so that the condensed water of the thermodynamic system is used for absorbing heat of the hot medium water in the hot medium water circulation system, and the temperature of the hot medium water is reduced.
3. The multiple-effect utilization system for the flue gas heat as claimed in claim 1, wherein a first end of the heater is connected with an outlet end of the heat medium water circulating water pump, a second end of the heater is connected with an outlet end of hot steam or hot water of a thermodynamic system, and a third end of the heater is connected with an inlet end of the hot steam or hot water of the thermodynamic system, so that the temperature of the heat medium water in the heat medium water circulating system can be increased by using the hot steam or hot water of the thermodynamic system.
4. The multi-effect flue gas heat utilization system of claim 1, wherein the heat consumer system further comprises:
one or more of a primary air heater, a purified flue gas heater, a wastewater flash evaporation concentration device and a heat exchange device, wherein one end of the primary air heater is connected with the circulating pipeline, the other end of the primary air heater is connected with the air preheater, and the purified flue gas heater, the wastewater flash evaporation concentration device and the heat exchange device are respectively connected with the heat medium water circulating system;
and the controller is also used for controlling the corresponding throttling element to be opened when a heating request of the primary air heater and/or the secondary air heater and/or the clean flue gas heater and/or the wastewater flash evaporation concentration device and/or the heat exchange device is received, so that the heating medium water in the circulating pipeline is utilized for heating.
5. The multi-effect utilization system for flue gas heat as claimed in claim 1, wherein the heater comprises:
a first heater disposed at an outlet of the flue gas cooler;
the second heater is arranged at the inlet or the outlet of the heat medium water circulating pump;
the controller is further used for controlling the throttling elements corresponding to the first heater and/or the second heater according to the water temperature of the hot medium water inlet of the flue gas cooler.
6. The multiple-effect utilization system for the flue gas heat as claimed in claim 1, further comprising:
a bypass flue gas system, the bypass flue gas system comprising: a bypass flue, a feed water heat exchanger and a condensed water heat exchanger which are arranged on the bypass flue, wherein,
the first end of the feed water heat exchanger is connected with the outlet of the boiler through the bypass flue, the second end of the feed water heat exchanger is connected with the feed water outlet end of the thermodynamic system, the third end of the feed water heat exchanger is connected with the feed water inlet end of the thermodynamic system, and the fourth end of the feed water heat exchanger is connected with the first end of the condensed water heat exchanger through the bypass flue;
the first end of the condensed water heat exchanger is connected with the fourth end of the feed water heat exchanger through the bypass flue, the second end of the condensed water heat exchanger is connected with the condensed water outlet end of the thermodynamic system, the third end of the condensed water heat exchanger is connected with the condensed water inlet end of the thermodynamic system, and the fourth end of the condensed water heat exchanger is connected with the outlet flue of the air preheater.
7. The multi-effect utilization system for the heat of the flue gas as recited in claim 1, wherein the flue gas cooler is arranged at an inlet of a dust remover and/or an inlet of a desulfurization absorption tower.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120769571.7U CN215062173U (en) | 2021-04-15 | 2021-04-15 | Flue gas heat multiple-effect utilization system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120769571.7U CN215062173U (en) | 2021-04-15 | 2021-04-15 | Flue gas heat multiple-effect utilization system |
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