CN219588910U - Waste heat recycling system of coal-fired boiler - Google Patents
Waste heat recycling system of coal-fired boiler Download PDFInfo
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- CN219588910U CN219588910U CN202320337502.8U CN202320337502U CN219588910U CN 219588910 U CN219588910 U CN 219588910U CN 202320337502 U CN202320337502 U CN 202320337502U CN 219588910 U CN219588910 U CN 219588910U
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Abstract
The utility model discloses a waste heat recycling system of a coal-fired boiler, wherein a flue at the tail of the boiler is sequentially provided with an economizer, a denitration device, an air preheater, a steam generator and a dust remover according to the trend of flue gas, a steam outlet of the steam generator is respectively connected with a steam outlet branch I and a steam outlet branch II, the steam outlet branch I is connected with a steam inlet of a steam-condensing water heater of a low-adding system of the boiler, the steam outlet branch II is connected with a steam inlet of a steam-air fan heater, an air outlet of the steam-air fan heater is connected with an air inlet of the air preheater, an air outlet of the air preheater is connected with an air inlet of the boiler, and a steam-condensing water heater and a water outlet of the steam-air fan heater are connected with a water inlet of the steam generator. The waste heat recycling system of the coal-fired boiler has the characteristics of high efficiency and low energy consumption, and deep utilization of the waste heat of the flue gas is realized by the synergistic effect of all the devices in the system, so that energy conservation and consumption reduction are realized.
Description
Technical Field
The utility model relates to the technical field of waste heat recovery systems, in particular to a waste heat recycling system of a coal-fired boiler.
Background
The deep utilization of the waste heat of the flue gas discharged by the combustion of the coal-fired boiler is an important link of energy conservation and emission reduction, and is always paid attention to, and a high-efficiency waste heat recycling system is a key point. At present, a shell-and-tube heat exchanger is generally adopted as flue gas waste heat recovery equipment in a coal-fired boiler waste heat recycling system. The heat exchanger is generally arranged in front of the dust remover, and ensures that the temperature of the flue gas entering the dust remover is in a low-temperature state while the waste heat of the flue gas is recovered, SO that the dust removal efficiency is improved, and SO3/H2SO4 aerosols are cooperatively removed. The recovered flue gas waste heat generally has the following three utilization modes:
(1) The low-temperature condensed water led out by the low-adding system is heated by heat exchange equipment (steam-condensed water heater), and the waste heat is recovered to the low-adding system of the steam turbine to replace low-adding steam extraction, so that the work of the steam turbine is increased, and the coal consumption is reduced.
(2) The flue gas heating device is used for heating circulating water and used as a heat source for heating wet flue gas after desulfurization, so that the emission of a dry chimney is realized, the white flue gas phenomenon of the chimney is eliminated or reduced, and the energy-saving effect cannot be achieved.
(3) The air heater is used for heating circulating water and used as a heat source of the air heater to heat cold air entering the air preheater. Besides the waste heat from the flue gas, many coal-fired boiler heat sources adopt steam extraction in a steam turbine at low pressure, and heat is transferred from steam to air through the air heater, so that the temperature of the air entering the cold end of the air preheater is increased.
In addition, a warm air blower is used for introducing hot condensate water of the unit to heat cold air entering the air preheater, but the condensate water with high water temperature is heated by low-added medium-pressure steam, so that the coal consumption is also increased.
And water is used as a circulating medium, the flue gas and water after the air preheater are subjected to heat exchange through the flue gas waste heat recovery equipment, the temperature of the circulating water is increased, the heated circulating water is used as a heat source to be conveyed to the heater, and cold air is heated, so that the air conditioner is a relatively energy-saving mode. However, because the circulating medium adopted is water, the temperature of the heated circulating water is limited, and the efficiency of water-gas heat exchange is poor, the outlet air temperature of the warm air device is difficult to heat to a higher level, and the heat exchange equipment is often large, so that the resistance and the energy consumption of the heat exchange equipment are increased, and finally the application range of the heat exchange equipment is greatly limited.
Therefore, the waste heat recycling system of the coal-fired boiler has respective problems.
Disclosure of Invention
The utility model aims to provide a waste heat recycling system of a coal-fired boiler, which realizes efficient and diversified utilization of the waste heat of the boiler flue gas and maximum utilization of the waste heat of the flue gas.
The purpose of the utility model is realized in the following way: the waste heat recycling system of the coal-fired boiler is characterized in that a coal economizer, a denitration device, an air preheater, a steam generator and a dust remover are sequentially arranged in a flue gas trend of a tail flue of the boiler, a steam outlet of the steam generator is respectively connected with a steam outlet branch I and a steam outlet branch II, the steam outlet branch I is connected with a steam inlet of a steam-condensing water heater of a low-adding system of the boiler, the steam outlet branch II is connected with a steam inlet of a steam-air fan heater, an air outlet of the steam-air fan heater is connected with an air inlet of the air preheater, an air outlet of the air preheater is connected with an air inlet of the boiler, and a water outlet of the steam-condensing water heater and a water outlet of the steam-air fan heater are connected with a water inlet of the steam generator.
According to the waste heat recycling system of the coal-fired boiler, the steam generator is arranged to fully absorb the residual heat of the boiler smoke, and a large amount of steam is generated and then divided into two paths for recycling. One path of the air is conveyed to a steam-air heater to heat primary air and secondary air, and the primary air and the secondary air at the inlet of the air preheater can be increased to higher temperature due to high steam temperature and high heat exchange efficiency, so that the problems of low-temperature corrosion and ammonium bisulfate adhesion blockage of the air preheater are solved. The other path is conveyed to a steam-condensation water heater to heat condensation water led out by the low-pressure system, and the indirect heat exchange is adopted, so that the influence on the water quality and the running condition of the original low-pressure system is smaller. And the liquid water condensed by cooling the steam enters the steam generator again to exchange heat to generate steam, so that the flue gas waste heat utilization is realized by reciprocating circulation. Compared with the traditional single waste heat utilization system, the waste heat recycling system of the coal-fired boiler can freely and flexibly adjust the steam quantity entering the steam-air heater and the steam-condensing water heater, and realizes reasonable distribution of the steam quantity according to different environmental conditions on site, thereby realizing the aim of saving the power generation coal consumption maximally. In conclusion, the coal-fired boiler waste heat recycling system has the characteristics of high efficiency and low energy consumption, and the waste heat of the flue gas is deeply utilized through the synergistic effect of all the devices in the system, so that the energy conservation and consumption reduction are realized.
As a further improvement of the utility model, the first steam outlet branch and the second steam outlet branch are respectively provided with an electric regulating valve. Therefore, the steam quantity entering the steam-air heater and the steam-condensing water heater can be freely regulated by the electric regulating valve, and the reasonable distribution of heat is ensured. In summer, the air temperature is higher, the heating amplitude required by primary air and secondary air is smaller, at the moment, the steam quantity entering the steam-air heater is reduced by reducing the opening of the electric regulating valve, and the steam quantity entering the steam-condensing water heater is increased by increasing the opening of the electric regulating valve; in winter, the temperature of the air is lower, the temperature rising amplitude of primary air and secondary air is larger, the steam quantity entering the air heater is increased by increasing the opening of the electric regulating valve, the opening of the electric regulating valve is reduced, the steam quantity entering the steam-condensing water heater is reduced, and finally, the reasonable distribution and utilization of heat are achieved.
As a further improvement of the utility model, the water outlets of the steam-condensing water heater and the steam-air fan heater are respectively connected with a first water outlet branch and a second water outlet branch, drain valves are respectively arranged on the first water outlet branch and the second water outlet branch, the tail ends of the first water outlet branch and the second water outlet branch are communicated with a drain buffer box, the drain buffer box is connected with the water inlet of the steam generator through a circulating water pipeline, and a circulating pump is arranged on the circulating water pipeline to ensure that condensed water and noncondensable gas in the first water outlet branch and the second water outlet branch are smoothly discharged and promote the condensed water to flow back to the steam generator.
As a further improvement of the utility model, a heat pipe is vertically arranged in the steam generator, the heat pipe is filled with desalted water, the heat pipe is divided into a heat pipe evaporation section and a heat pipe condensation section by a heat insulation partition plate which is horizontally arranged, a water jacket is arranged outside the heat pipe condensation section, the water jackets of adjacent rows are connected through connecting pipes, a connecting pipe at an inlet side is connected with an inlet water header, a connecting pipe at an outlet side is connected with an outlet steam header, a steam outlet branch I and a steam outlet branch II are connected with an outlet steam header, a water outlet branch I and a water outlet branch II are connected with the inlet water header, a smoke inlet and a smoke outlet of the steam generator are arranged at the lower side, the smoke inlet and the outlet steam header are arranged at the same side, and the smoke outlet and the inlet water header are arranged at the same side. The heat transfer process of the heat pipe is as follows: the inside of the heat pipe is in a high vacuum state, high-temperature flue gas flows in from the evaporation section of the heat pipe, so that the medium (desalted water) in the evaporation section of the heat pipe absorbs heat and evaporates, generated steam rises to the condensation section of the heat pipe along the inside of the heat pipe and releases heat, heat is transferred to circulating water, the temperature of the circulating water rises, the evaporated steam in the heat pipe is cooled and condensed into a liquid state and then flows back to the evaporation section of the heat pipe again by gravity, and heat transfer is realized by reciprocating circulation, so that the temperature of a flue gas outlet is reduced. Because steam condensation phase change heat exchange is adopted, the heat exchanger has higher heat exchange efficiency, the heat exchanger can be made smaller, the steam flow rate is 15-30 times of the flow rate of a conventional water pipeline because the unit mass steam carries a large amount of heat, the related pipeline and the valve can be smaller in size, the investment is less, the flow and the power of the pump can be obviously reduced, and the conveying energy consumption is saved. In addition, circulating water and flue gas flow through the upper part and the lower part respectively in the structure, the flue gas and the circulating water are separated by the heat insulation partition board, each heat pipe is an independent heat exchange element, even if a single heat pipe leaks due to abrasion and corrosion and the like caused by continuous scouring of fly ash particles in the flue gas, only a small amount of working medium in the heat pipe leaks into a flue, the heat exchange system is hardly influenced, and the service life of equipment is prolonged.
As a further improvement of the utility model, the upper side space of the heat insulation partition plate is divided into a direct heat exchange section and a phase change heat exchange section, and the upper end and the lower end of a water jacket of the phase change heat exchange section are respectively connected with a phase change heat exchange lower header and a phase change heat exchange upper header. The circulating water is distributed to the water jacket through the connecting pipe from the inlet water header, exchanges heat with the heat pipe condensation section, the circulating water flows through the direct heat exchange section, then the low-temperature circulating water is heated to become high-temperature circulating water, the high-temperature circulating water then enters the phase-change heat exchange lower header, the high-temperature circulating water is further heated in the phase-change heat exchange section to generate steam, the steam enters the phase-change heat exchange upper header, and then enters the outlet steam header to be subjected to steam-water separation and then is conveyed to various occasions needing a steam heat source. The structure ensures that the generated steam has higher quality, the application occasion is basically unlimited, and the application range is greatly expanded.
Drawings
FIG. 1 is a schematic diagram of a waste heat recycling system of a coal-fired boiler.
Fig. 2 is a schematic view of a steam generator of the waste heat recycling system of the coal-fired boiler of the present utility model.
The device comprises a boiler 1, a coal economizer 2, a denitration device 3, an air preheater 4, a steam generator 5, a dust remover 6, a boiler low-adding system 7, a steam-condensation water heater 8, a steam-air fan heater 9, an electric regulating valve 10, a drain valve 11, a drain cache tank 12, a circulating pump 13, a heat pipe 14, a heat pipe evaporation section 14A, a heat pipe condensation section 14B, a heat insulation baffle 15, a water jacket 16, an inlet water header 17, an outlet steam header 18, a phase-change heat exchange lower header 19 and a phase-change heat exchange upper header 20.
Description of the embodiments
The waste heat recycling system of the coal-fired boiler 1 shown in fig. 1 is characterized in that an economizer 2, a denitration device 3, an air preheater 4, a steam generator 5 and a dust remover 6 are sequentially arranged in a tail flue of the boiler 1 according to the trend of flue gas.
The steam outlet of the steam generator 5 is respectively connected with a first steam outlet branch and a second steam outlet branch. The first steam outlet branch is connected with a steam inlet of a steam-condensing water heater 8 of a boiler low-pressure adding system 7, the second steam outlet branch is connected with a steam inlet of a steam-air fan heater 9, an air outlet of the steam-air fan heater 9 is connected with an air inlet of an air preheater 4, an air outlet of the air preheater 4 is connected with an air inlet of a boiler 1, and a water outlet of the steam-condensing water heater 8 and a water outlet of the steam-air fan heater 9 are connected with a water inlet of a steam generator 5. And the first steam outlet branch and the second steam outlet branch are respectively provided with an electric regulating valve 10. So that the steam quantity entering the steam-air heater and the steam-condensing water heater 8 can be freely regulated by the electric regulating valve 10, and the reasonable distribution of heat is ensured. The water outlets of the steam-condensing water heater 8 and the steam-air fan heater 9 are respectively connected with a first water outlet branch and a second water outlet branch, drain valves 11 are respectively arranged on the first water outlet branch and the second water outlet branch, the tail ends of the first water outlet branch and the second water outlet branch are communicated with a drain buffer tank 12, the drain buffer tank 12 is connected with the water inlet of the steam generator 5 through a circulating water pipeline, a circulating pump 13 is arranged on the circulating water pipeline, the condensed water and noncondensable gas in the first water outlet branch and the second water outlet branch are ensured to be smoothly discharged, and the condensed water is promoted to flow back to the steam generator 5.
In the waste heat recycling system of the coal-fired boiler, the steam generator 5 is arranged to fully absorb the waste heat of the flue gas of the boiler 1, and a large amount of steam is generated and then divided into two paths for recycling. One path is conveyed to a steam-air heater, so that steam exchanges heat with primary air and secondary air, the heated primary air and secondary air enter the air preheater 4, the steam is cooled and condensed into liquid water, and the liquid water enters the drainage buffer tank 12 through the drainage valve 11. The other path is conveyed to a steam-condensation water heater 8, the steam and condensation water led out by the low-adding system are subjected to indirect heat exchange, the condensation water heated and warmed is returned to the low-adding system, the steam is cooled and condensed into liquid water, and the liquid water enters a drainage buffer tank 12 through a drain valve 11. The water in the drainage buffer tank 12 enters the steam generator 5 again for heat exchange after being pressurized by the circulating pump 13 to generate steam, and the waste heat of the flue gas is utilized by reciprocating circulation. The steam quantity entering the steam-air heater and the steam-condensing water heater 8 can be freely regulated by the electric regulating valve 10, so that reasonable distribution of heat is ensured. In summer, the air temperature is higher, the heating amplitude required by primary air and secondary air is smaller, at the moment, the steam quantity entering the steam-air heater is reduced by reducing the opening of the electric regulating valve 10, and the steam quantity entering the steam-condensing water heater 8 is increased by increasing the opening of the electric regulating valve 10; in winter, the temperature of the air is lower, the temperature rising amplitude of primary air and secondary air is larger, the steam quantity entering the air heater is increased by increasing the opening of the electric regulating valve 10, the opening of the electric regulating valve 10 is reduced, the steam quantity entering the steam-condensing water heater 8 is reduced, and finally, the reasonable distribution and utilization of heat are achieved.
As shown in fig. 2, a heat pipe 14 is vertically installed in a steam generator 5 of the waste heat recycling system of the coal-fired boiler in this embodiment, the heat pipe 14 is filled with demineralized water, the heat pipe 14 is divided into a heat pipe evaporation section 14A and a heat pipe condensation section 14B by a horizontally arranged heat insulation partition 15, a water jacket 16 is arranged outside the heat pipe condensation section 14B, the water jackets 16 of adjacent rows are connected through connecting pipes, a connecting pipe at an inlet side is connected with an inlet water header 17, a connecting pipe at an outlet side is connected with an outlet steam header 18, a steam outlet branch I and a steam outlet branch II are connected with the outlet steam header 18, a water outlet branch I and a steam outlet branch II are connected with the inlet water header 17, a smoke inlet and a smoke outlet of the steam generator 5 are both arranged at the lower side, the smoke inlet and the outlet steam header 18 are arranged at the same side, and the smoke outlet and the inlet water header 17 are arranged at the same side.
The heat pipe 14 thus has a heat transfer process of: the inside of the heat pipe 14 is in a high vacuum state, high-temperature flue gas flows in from the heat pipe evaporation section 14A, so that the medium (desalted water) in the heat pipe evaporation section 14A absorbs heat and evaporates, generated steam rises to the heat pipe condensation section 14B along the inside of the heat pipe 14 and releases heat, heat is transferred to circulating water, the temperature of the circulating water rises, the evaporated steam in the heat pipe 14 is cooled and condensed into a liquid state, and then flows back to the heat pipe evaporation section 14A again by gravity, and heat transfer is realized by reciprocating circulation, so that the temperature of a flue gas outlet is reduced. Because steam condensation phase change heat exchange is adopted, the heat exchanger has higher heat exchange efficiency, the heat exchanger can be made smaller, the steam flow rate is 15-30 times of the flow rate of a conventional water pipeline because the unit mass steam carries a large amount of heat, the related pipeline and the valve can be smaller in size, the investment is less, the flow and the power of the pump can be obviously reduced, and the conveying energy consumption is saved. In addition, circulating water and flue gas flow through the upper part and the lower part respectively in the structure, the flue gas and the circulating water are separated by the heat insulation partition plate 15, each heat pipe 14 is an independent heat exchange element, even if a single heat pipe 14 leaks due to abrasion and corrosion and the like caused by continuous scouring of fly ash particles in the flue gas, only a small amount of working medium in the heat pipe 14 leaks into a flue, the heat exchange system is hardly influenced, and the service life of equipment is prolonged.
In the embodiment, the upper space of the heat insulation partition plate 15 is divided into a direct heat exchange section and a phase change heat exchange section, and the upper end and the lower end of the water jacket 16 of the phase change heat exchange section are respectively connected with a phase change heat exchange lower header 19 and a phase change heat exchange upper header 20. The circulating water is distributed to the water jacket 16 through the connecting pipe by the inlet water header 17, exchanges heat with the heat pipe condensation section 14B, the circulating water passes through the direct heat exchange section, then the low-temperature circulating water is heated to become high-temperature circulating water, the high-temperature circulating water then enters the phase-change heat exchange lower header 19, the high-temperature circulating water generates steam after being further heated in the phase-change heat exchange section, enters the phase-change heat exchange upper header 20, then enters the outlet steam header 18 for steam-water separation, and is conveyed to various occasions needing a steam heat source. The structure ensures that the generated steam has higher quality, the application occasion is basically unlimited, and the application range is greatly expanded.
The utility model is not limited to the above embodiments, and based on the technical solution disclosed in the utility model, a person skilled in the art may make some substitutions and modifications to some technical features thereof without creative effort according to the technical content disclosed, and all the substitutions and modifications are within the protection scope of the utility model.
Claims (5)
1. The utility model provides a coal fired boiler waste heat cyclic utilization system which characterized in that: the boiler tail flue is sequentially provided with an economizer, a denitration device, an air preheater, a steam generator and a dust remover according to the trend of flue gas, a steam outlet of the steam generator is respectively connected with a first steam outlet branch and a second steam outlet branch, the first steam outlet branch is connected with a steam inlet of a steam-condensing water heater of a boiler low-adding system, the second steam outlet branch is connected with a steam inlet of a steam-air fan heater, an air outlet of the steam-air fan heater is connected with an air inlet of the air preheater, an air outlet of the air preheater is connected with an air inlet of the boiler, and a steam-condensing water heater and a water outlet of the steam-air fan heater are connected with a water inlet of the steam generator.
2. The coal-fired boiler waste heat recycling system according to claim 1, wherein: and electric regulating valves are respectively arranged on the first steam outlet branch and the second steam outlet branch.
3. The coal-fired boiler waste heat recycling system according to claim 1, wherein: the steam-condensing water heater and the steam-air fan heater are respectively connected with a first water outlet branch and a second water outlet branch, drain valves are respectively arranged on the first water outlet branch and the second water outlet branch, the tail ends of the first water outlet branch and the second water outlet branch are communicated with a drain cache box, the drain cache box is connected with a water inlet of the steam generator through a circulating water pipeline, and a circulating pump is arranged on the circulating water pipeline.
4. The waste heat recycling system of coal-fired boiler according to claim 3, wherein: the steam generator is characterized in that a heat pipe is vertically arranged in the steam generator, the heat pipe is filled with desalted water, the heat pipe is divided into a heat pipe evaporation section and a heat pipe condensation section by a heat insulation partition plate which is horizontally arranged, a water jacket is arranged outside the heat pipe condensation section, the water jackets of adjacent rows are connected through connecting pipes, a connecting pipe at an inlet side is connected with an inlet water header, a connecting pipe at an outlet side is connected with an outlet steam header, a steam outlet branch I and a steam outlet branch II are connected with an outlet steam header, a steam outlet branch I and a water outlet branch II are connected with the inlet water header, a smoke inlet and a smoke outlet of the steam generator are both arranged at the lower side, and the smoke inlet and the outlet steam header are arranged at the same side.
5. The coal-fired boiler waste heat recycling system according to claim 4, wherein: the upper side space of the heat insulation partition plate is divided into a direct heat exchange section and a phase-change heat exchange section, and the upper end and the lower end of a water jacket of the phase-change heat exchange section are respectively connected with a phase-change heat exchange lower header and a phase-change heat exchange upper header.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320337502.8U CN219588910U (en) | 2023-02-28 | 2023-02-28 | Waste heat recycling system of coal-fired boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202320337502.8U CN219588910U (en) | 2023-02-28 | 2023-02-28 | Waste heat recycling system of coal-fired boiler |
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| CN202320337502.8U Active CN219588910U (en) | 2023-02-28 | 2023-02-28 | Waste heat recycling system of coal-fired boiler |
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