CN212108481U - Coal-fired unit coupling primary air heat exchange and low-grade flue gas waste heat grading utilization device - Google Patents
Coal-fired unit coupling primary air heat exchange and low-grade flue gas waste heat grading utilization device Download PDFInfo
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Abstract
A coal-fired unit coupling primary air heat exchange and low-grade flue gas waste heat grading utilization device aims at multi-grade utilization of flue gas waste heat and comprises a main body grading utilization path and a bypass anti-leakage exchange path. The bypass leakage-proof path is characterized in that a bypass heat exchanger is independently arranged on a primary fan, so that the primary air leakage problem of the rotary air preheater is reduced; the main body is cooled by multistage heat exchange in a staged utilization path, the first stage is gas-gas heat exchange, and a low-temperature gas-gas plate heat exchanger is adopted to heat cold air into primary hot air by using low-temperature flue gas in front of a dust remover; the second stage is gas-gas heat exchange, and primary hot air is heated by utilizing an original primary air bin of the rotary air preheater to form secondary hot air; the third stage is air-water heat exchange, and the second-stage hot air is heated and fed to form third-stage hot air; the fourth stage is gas-water heat exchange, and the third-stage hot air heats the condensed water to form fourth-stage hot air; one path of the four-level hot air is sent to an inlet of a boiler blower to be mixed with cold air and enters a boiler system; and the other path is conveyed to the inlet of the primary fan to be converged with cold air, so that the cold end corrosion of the equipment is avoided.
Description
Technical Field
The utility model belongs to the technical field of flue gas waste heat energy-conservation is carried and is imitated transformation, concretely relates to coal-fired unit coupling wind heat transfer and low-grade flue gas waste heat fractional utilization device.
Background
The three-bin rotary air preheater has the advantages of compact structure, convenience in arrangement, flexibility in adjustment, high thermal efficiency and the like, most of international large-capacity thermal power generating units adopt the air preheater with the structural type, and usually one boiler is provided with two primary fans. Because the pressure is higher, the air leakage rate of the primary air in the three-bin air preheater is far higher than that of the whole preheater; the air leakage rate of the normal air preheater is about 6-8%, and the air leakage rate of primary air is 70-80% of the total air leakage rate of the air preheater; therefore, huge waste is caused to the energy consumption of the unit. Generally, the air leakage rate of each 1% increase affects the coal consumption of a unit by 0.1g/kW.h, and the power consumption of a primary air fan is increased by 20-30%.
In addition, the smoke discharge loss of the coal-fired unit is the most important heat loss in the operation of the boiler, the smoke discharge temperature of the coal-fired unit boiler is usually 130-150 ℃, the corresponding heat loss is 5-12% of the heat of the fuel and accounts for 60-70% of the heat loss of the boiler. The main factor influencing the heat loss of the exhaust gas is the exhaust gas temperature, and generally, the heat loss of the exhaust gas is increased by 0.6 to 1 percent when the exhaust gas temperature is increased by 10 ℃, and correspondingly, the coal consumption is increased by 1.2 to 2.4 percent.
The three-bin rotary air preheater adopted by the thermal power plant in China at present can not avoid serious air leakage of the air preheater, especially serious primary air leakage. In addition, the exhaust gas temperature of a plurality of boilers exceeds the design value and is about 20-50 ℃ higher than the design value, so that the reduction of air leakage of the air preheater and the reduction of the exhaust gas temperature have important practical significance for saving fuel and reducing pollution.
The existing air leakage solution of the three-divided-bin air preheater mainly adopts flexible sealing or double-channel axial sealing, and the problem of large leakage of primary air cannot be fundamentally solved; in addition, the waste heat of the smoke is mainly realized by arranging a low-temperature economizer, the waste heat in the smoke discharged by the boiler is recycled by the existing low-temperature economizer technology, and the recycled heat enters a steam turbine system, so that the heat consumption of the steam turbine is reduced, but the waste heat does not enter the boiler system, and the smoke discharged by the boiler is still the smoke side outlet temperature of an air preheater, so that the boiler efficiency is not changed due to the fact that the temperature is not changed in the prior art. In addition, most of the existing low-temperature economizers have the problems of blockage, corrosion and the like, and the recovery efficiency of the flue gas waste heat of the low-temperature economizers is influenced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a coal-fired unit coupling wind heat transfer and low-grade flue gas waste heat utilization equipment in grades solves current three minute storehouse gyration air preheater and can not avoid causing air preheater to leak out serious, especially a wind serious technical problem of leaking to and partial boiler exhaust gas temperature surpasss design value, the easy jam corrosion scheduling problem of low temperature economizer.
In order to achieve the technical purpose, the utility model adopts the following technical scheme:
a coal-fired unit coupling primary air heat exchange and low-grade flue gas waste heat grading utilization device comprises a boiler blower, a rotary air preheater, a boiler, an SCR (selective catalytic reduction) reactor, an electrostatic dust collector and desulfurization equipment which are sequentially connected through an air pipe, wherein the air pipe between the SCR reactor and the electrostatic dust collector passes through the rotary air preheater again, a powder making system and a water supply system are arranged on the boiler, the powder making system comprises a primary air blower and powder making equipment which are sequentially connected through the air pipe, and the water supply system comprises a condensed water pipeline at the front section and a water supply pipeline at the rear section; the device also comprises a main body waste heat recovery system; the main waste heat recovery system comprises a low-temperature air feeder, a primary heat exchanger, a secondary heat exchanger and a tertiary heat exchanger which are sequentially connected through air pipes;
the primary heat exchanger is arranged on an inlet pipeline of the electrostatic dust collector, and cold air at the outlet of the low-temperature air feeder exchanges heat with high-temperature flue gas at the inlet of the electrostatic dust collector to form primary hot air;
an air pipe between the primary heat exchanger and the secondary heat exchanger passes through the rotary air preheater, and primary hot air from the primary heat exchanger is secondarily heated in the rotary air preheater to form secondary hot air;
the second-stage heat exchanger is arranged on the water supply pipeline, and second-stage hot air from the rotary air preheater exchanges heat with low-temperature water supply in the water supply pipeline to form third-stage hot air;
the three-stage heat exchanger is arranged on the condensed water pipeline, and the three-stage hot air from the second-stage heat exchanger exchanges heat with the low-temperature condensed water in the condensed water pipeline to form four-stage hot air;
the air pipe of the air outlet of the tertiary heat exchanger is divided into two paths, namely a first branch pipe and a second branch pipe, the first branch pipe is converged with the inlet air pipe of the boiler blower, and the second branch pipe is converged with the inlet air pipe of the primary air fan.
In addition, as the preferred technical proposal of the utility model, the device also comprises a bypass leakage-proof heat exchange system; the bypass leakage-proof heat exchange system comprises an air preheater bypass air pipe and a bypass air preheater arranged on the air preheater bypass air pipe; an air inlet of the bypass air pipe of the air preheater is communicated with an outlet air pipe of the SCR reactor, and an air outlet of the bypass air pipe of the air preheater is communicated with an inlet air pipe of the rotary air preheater; the bypass air preheater is arranged on an inlet air pipe of the powder making equipment, and cold primary air from the primary air fan exchanges heat with bypass flue gas at the outlet of the SCR reactor in the bypass air preheater.
Further, the primary heat exchanger is a low-temperature gas-gas plate heat exchanger, a corrugated plate heat exchanger is adopted, the temperature of high-temperature flue gas at an inlet is 130-160 ℃, the temperature of low-temperature flue gas at an outlet is reduced to be below 110 ℃, and the temperature of primary hot air at an outlet is above 120 ℃.
Furthermore, the rotary air preheater is a three-bin rotary air preheater, and primary hot air enters an original primary air bin of the rotary air preheater and is heated to form secondary hot air with the temperature of more than 300 ℃.
Further, the secondary heat exchanger is a high-temperature gas-water tubular heat exchanger, a high-efficiency finned tubular heat exchanger is adopted, and secondary hot air enters the secondary heat exchanger to heat feed water to more than 150 ℃ to form tertiary hot air at the temperature of 140-160 ℃.
Further, the third-stage heat exchanger is a low-temperature gas-water tubular heat exchanger, and a high-efficiency finned tubular heat exchanger is adopted to heat the condensed water to be more than 80 ℃ so as to form four-stage hot air with the temperature of 50-70 ℃.
Further, the bypass air preheater is a primary air plate type air preheater and adopts a high-efficiency finned plate type heat exchanger, the temperature of high-temperature flue gas at an inlet of the heat exchanger is 50-70 ℃, the temperature of low-temperature flue gas at an outlet of the heat exchanger is reduced to be below 150 ℃, and the temperature of hot air at an outlet of the heat exchanger is 310-330 ℃.
Furthermore, valves are arranged on the first branch pipe, the second branch pipe and the air preheater bypass air pipe.
Furthermore, the outlet air pipes of the boiler blower and the primary air fan and the inlet pipe and the outlet pipe of the primary heat exchanger are respectively provided with a valve.
Compared with the prior art, the beneficial effects of the utility model are as follows:
1. the utility model discloses set up the bypass and prevent leaking the route of changing, set up bypass air preheater and air preheater bypass tuber pipe, original air preheater's air alone carries out the heat transfer through plate heat exchanger, thoroughly eliminates the air leakage rate;
2. the utility model discloses the low temperature flue gas waste heat is utilized to the degree of depth recovery step, and the hot-blast way of level four is sent to boiler forced draught blower entry and is mixed with cold wind, preheats the overgrate air, and the heat of retrieving has entered boiler system, reduces unit electricity generation coal consumption rate, improves boiler efficiency, improves cold junction temperature and avoids air preheater cold junction to corrode; the other path is sent to the inlet of the primary air fan to be converged with cold air, so that cold end corrosion of the primary air plate type air preheater is avoided;
3. the utility model heats the cold secondary air, improves the boiler efficiency, and relieves the cold end corrosion of the air preheater; the temperature of the flue gas at the inlet of the dust remover is effectively reduced, and the dust removal efficiency is improved;
4. the inlet smoke temperature of the desulfurization equipment of the utility model is reduced, the evaporation capacity of the water in the desulfurization tower is reduced, and the consumption of the desulfurization process water is saved;
5. the utility model discloses the device utilizes hot-blast heating feedwater and condensate water to crowd the low pressure extraction steam among the partly backheat system, and this part steam does work in steam turbine low pressure cylinder more and reduces the steam turbine heat consumption, reaches energy-conserving purpose of carrying the effect, has solved the problem that the flue gas heating condensate water exists the jam corruption for the current low temperature economizer.
Drawings
The invention will be further explained with reference to the drawings:
fig. 1 is the overall structure schematic diagram of the flue gas waste heat multistage utilization device of the utility model.
Reference numerals: 1-boiler blower, 2-rotary air preheater, 3-boiler, 4-SCR reactor, 5-electrostatic dust collector, 6-desulfurization equipment, 7-powder process system, 7.1-primary fan, 7.2-powder process equipment, 8-water supply system, 8.1-condensed water pipeline, 8.2-water supply pipeline, 9-main body waste heat recovery system, 9.1-low temperature blower, 9.2-primary heat exchanger, 9.3-secondary heat exchanger, 9.4-tertiary heat exchanger, 9.5-air pipe, 9.6-first branch pipe, 9.7-second branch pipe, 10-bypass leakage-proof heat exchange system, 10.1-air preheater bypass air pipe and 10.2-bypass air preheater.
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.
As shown in fig. 1, to a coal-fired unit coupling primary air heat transfer and low-grade flue gas waste heat fractional utilization device of a certain power plant energy-conservation improvement project, include boiler forced draught blower 1 connected in order through the tuber pipe, gyration air preheater 2, boiler 3, SCR reactor 4, electrostatic precipitator 5 and sweetener 6, wherein the tuber pipe is once more through gyration air preheater 2 between SCR reactor 4 and the electrostatic precipitator 5, dispose powder process system 7 and water supply system 8 on the boiler 1.3, powder process system 7 includes primary air fan 7.1 and powder process equipment 7.2 connected in order through the tuber pipe, water supply system 8 includes the condensate water pipeline 8.1 of anterior segment and the water supply pipeline 8.2 of back end, its characterized in that: the system also comprises a main body waste heat recovery system 9 and a bypass leakage-proof heat exchange system 10.
The main waste heat recovery system 9 comprises a low-temperature blower 9.1, a primary heat exchanger 9.2, a secondary heat exchanger 9.3 and a tertiary heat exchanger 9.4 which are connected in sequence through air pipes;
one-level heat exchanger 9.2 is low temperature gas plate heat exchanger, adopts corrugated plate heat exchanger, and heat exchange efficiency is high to take up an area of for a short time, locates the inlet pipeline of electrostatic precipitator 5, and cold wind delivers to low temperature gas plate heat exchanger through low temperature forced draught blower 9.1, and low temperature gas plate heat exchanger's heat source is coal-fired unit electrostatic precipitator entry low temperature flue gas. The primary hot air with the outlet temperature of 100 ℃ of the low-temperature gas-gas plate heat exchanger enters the original primary air cabin of the rotary air preheater and is heated to secondary hot air with the outlet temperature of more than 300 ℃, and the waste heat of the flue gas is recovered.
The air pipe between the first-stage heat exchanger 9.2 and the second-stage heat exchanger 9.3 passes through the rotary air preheater 2, the rotary air preheater 2 is a three-chamber rotary air preheater, and first-stage hot air heated by the low-temperature gas-gas plate type heat exchanger enters an original primary air chamber of the rotary air preheater to be secondarily heated, and the heating is second-stage hot air.
The second-stage heat exchanger 9.3 is a high-temperature gas-water tubular heat exchanger, a high-efficiency fin tubular heat exchanger is adopted and arranged on a water supply pipeline 8.2, second-stage hot air at the outlet of the rotary air preheater 2 enters the high-temperature gas-water tubular heat exchanger to be used for heating water supply, and the hot air after heat exchange through the high-temperature gas-water tubular heat exchanger is third-stage hot air. The heated two-stage hot air with the temperature of more than 300 ℃ enters the high-temperature gas-water tubular heat exchanger to heat the feed water, the feed water is heated to more than 150 ℃, the waste heat of the flue gas is utilized to heat the feed water, a part of low-pressure extracted steam in the regenerative system is expelled, and the part of steam does more work in a low-pressure cylinder of the steam turbine to reduce the heat consumption of the steam turbine, thereby achieving the purpose of saving energy and improving efficiency. The low-temperature gas-water tubular heat exchanger of the high-temperature gas-water tubular heat exchanger is a high-efficiency finned tubular heat exchanger.
The three-stage heat exchanger 9.4 is a low-temperature gas-water tubular heat exchanger, a high-efficiency fin tubular heat exchanger is adopted and arranged on a condensate pipeline 8.1, three-stage hot air passing through the high-temperature gas-water tubular heat exchanger enters the low-temperature gas-water tubular heat exchanger to heat condensate water, and the hot air after heat exchange through the low-temperature gas-water tubular heat exchanger is four-stage hot air. The tertiary hot air passing through the high-temperature gas-water tubular heat exchanger enters the low-temperature gas-water tubular heat exchanger to heat the condensed water, the condensed water is heated to be above 80 ℃, the condensed water is heated by utilizing the waste heat of the low-temperature flue gas, part of low-pressure extracted steam in a regenerative system is expelled, and the part of steam does more work in a low-pressure cylinder of the steam turbine to reduce the heat consumption of the steam turbine, thereby achieving the purpose of saving energy and improving efficiency. The low-temperature gas-water tubular heat exchanger is a high-efficiency finned tubular heat exchanger.
An air pipe 9.5 at an air outlet of the tertiary heat exchanger 9.4 is divided into two paths, namely a first branch pipe 9.6 and a second branch pipe 9.7, the first branch pipe 9.6 is converged with an inlet air pipe of the boiler blower 1, and the second branch pipe 9.7 is converged with an inlet air pipe of the primary air fan 7.1. The hot-blast return of level four through low temperature gas water tubular heat exchanger reaches boiler forced draught blower entry and entry cold wind and joins, and the heat of retrieving on the one hand has got into boiler system, reduces unit electricity generation coal consumption rate, improves boiler efficiency, and on the other hand improves air heater overgrate air entry cold wind temperature, avoids taking place air heater cold junction low temperature corrosion. The four-stage hot air passing through the low-temperature air-water tubular heat exchanger returns to the primary air fan inlet to be converged with inlet cold air, on one hand, the recovered heat enters the boiler system, the coal consumption rate of unit power generation is reduced, the boiler efficiency is improved, on the other hand, the temperature of the inlet cold air of the primary air plate type air preheater is improved, and the cold end low-temperature corrosion of the primary air plate type air preheater is avoided.
The bypass leakage-proof heat exchange system 10 comprises an air preheater bypass air pipe 10.1 and a bypass air preheater 10.2 arranged on the air preheater bypass air pipe; an air inlet of the air preheater bypass air pipe 10.1 is communicated with an outlet air pipe of the SCR reactor 4, and an air outlet is communicated with an inlet air pipe of the rotary air preheater 2; bypass air preheater 10.2 is a wind plate type air preheater, adopts high-efficient fin plate heat exchanger, locates on the entry tuber pipe of powder process equipment 7, and the cold primary air that comes out from primary air fan 7.1 exchanges heat with the bypass flue gas of SCR reactor 4 export in bypass air preheater 10.2. And cold air is sent to the primary air plate type air preheater through the primary fan, and the heat source of the primary air plate type air preheater is bypass flue gas at the outlet part of the SCR reactor of the coal-fired unit. The low-temperature flue gas at 130-180 ℃ in front of the dust remover is used for heating cold air to be more than 100 ℃, the waste heat of the low-temperature flue gas is recovered to reduce the exhaust temperature, and the exhaust temperature is reduced to be less than 110 ℃.
To sum up, the utility model is provided with a primary air plate type air preheater for heating cold primary air, and the original primary air chamber of the rotary air preheater for heating primary hot air at the outlet of the low-temperature gas-gas plate type heat exchanger, aiming at utilizing flue gas waste heat in multiple stages, and the primary air fan of the power plant is provided with a bypass plate type heat exchanger independently, thereby reducing the primary air leakage problem of the rotary air preheater; in addition, the exhaust gas temperature of the boiler is reduced by adopting multi-stage heat exchange, the first stage is gas-gas heat exchange, the low-temperature gas-gas plate heat exchanger is adopted to heat cold air into first-stage hot air by utilizing low-temperature flue gas in front of the dust remover, the flue gas waste heat is recycled to reduce the inlet flue gas temperature of the dust remover, the dust removal efficiency is improved, the inlet flue gas temperature of the desulfurizing tower is reduced, the evaporation capacity of water in the desulfurizing tower is reduced, and the consumption of desulfurizing process water is saved. The second stage is gas-gas heat exchange, primary hot air is heated by the original primary air bin of the rotary air preheater, and the heated hot air is secondary hot air. The third stage is air-water heat exchange, the second stage hot air heats the water supply to improve the water supply temperature, and the hot air after heating the water supply is the third stage hot air. The fourth stage is air-water heat exchange, the third-stage hot air heats the condensed water to improve the temperature of the condensed water, and the hot air after heating the condensed water is the fourth-stage hot air. The third stage and the fourth stage exchange heat, the recovered heat enters the steam turbine system, and part of low-pressure extraction steam in the regenerative system is expelled, so that the heat consumption of the steam turbine is reduced. The fifth stage is direct heat exchange of gas and gas, one path of four-stage hot air is sent to an inlet of a boiler blower to be mixed with cold air, secondary air is preheated, recovered heat enters a boiler system, the coal consumption rate of unit power generation is reduced, the boiler efficiency is improved, and the temperature of a cold end is improved to avoid corrosion of the cold end of the air preheater; and the other path is conveyed to the inlet of the primary air fan to be converged with cold air, so that cold end corrosion of the primary air plate type air preheater is avoided.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
Claims (9)
1. The utility model provides a coal-fired unit coupling primary air heat transfer and low-grade flue gas waste heat utilization equipment in grades, includes boiler forced draught blower (1), gyration air preheater (2), boiler (3), SCR reactor (4), electrostatic precipitator (5) and sweetener (6) that connect in order through the tuber pipe, wherein the tuber pipe is once more through gyration air preheater (2) between SCR reactor (4) and electrostatic precipitator (5), configuration powder process system (7) and water supply system (8) on boiler (3), powder process system (7) include primary air fan (7.1) and powder process equipment (7.2) that connect in order through the tuber pipe, water supply system (8) include condensate water pipeline (8.1) of anterior segment and water supply pipeline (8.2) of back end, its characterized in that:
the device also comprises a main body waste heat recovery system (9);
the main waste heat recovery system (9) comprises a low-temperature blower (9.1), a primary heat exchanger (9.2), a secondary heat exchanger (9.3) and a tertiary heat exchanger (9.4) which are sequentially connected through air pipes;
the primary heat exchanger (9.2) is arranged on an inlet pipeline of the electrostatic dust collector (5), and cold air at the outlet of the low-temperature air feeder (9.1) exchanges heat with high-temperature flue gas at the inlet of the electrostatic dust collector (5) to form primary hot air;
an air pipe between the primary heat exchanger (9.2) and the secondary heat exchanger (9.3) passes through the rotary air preheater (2), and primary hot air from the primary heat exchanger (9.2) is secondarily heated in the rotary air preheater (2) to form secondary hot air;
the secondary heat exchanger (9.3) is arranged on the water supply pipeline (8.2), and secondary hot air from the rotary air preheater (2) exchanges heat with low-temperature water supply in the water supply pipeline (8.2) to form tertiary hot air;
the three-stage heat exchanger (9.4) is arranged on the condensed water pipeline (8.1), and the three-stage hot air from the second-stage heat exchanger (9.3) exchanges heat with the low-temperature condensed water in the condensed water pipeline (8.1) to form four-stage hot air;
the tuber pipe (9.5) of tertiary heat exchanger (9.4) air outlet divide into two the tunnel, is first branch pipe (9.6) and second branch pipe (9.7) respectively, first branch pipe (9.6) are joined with the entry tuber pipe of boiler forced draught blower (1), second branch pipe (9.7) are joined with the entry tuber pipe of primary air fan (7.1).
2. The coal-fired unit coupling primary air heat exchange and low-grade flue gas waste heat grading utilization device according to claim 1, characterized in that: the system also comprises a bypass leakage-proof heat exchange system (10);
the bypass leakage-proof heat exchange system (10) comprises an air preheater bypass air pipe (10.1) and a bypass air preheater (10.2) arranged on the air preheater bypass air pipe; an air inlet of the air preheater bypass air pipe (10.1) is communicated with an outlet air pipe of the SCR reactor (4), and an air outlet is communicated with an inlet air pipe of the rotary air preheater (2);
the bypass air preheater (10.2) is arranged on an inlet air pipe of the pulverizing system (7), and cold primary air coming out of the primary air fan (7.1) and bypass flue gas at the outlet of the SCR reactor (4) exchange heat in the bypass air preheater (10.2).
3. The coal-fired unit coupling primary air heat exchange and low-grade flue gas waste heat grading utilization device according to claim 1, characterized in that: the primary heat exchanger (9.2) is a low-temperature gas-gas plate heat exchanger, a corrugated plate heat exchanger is adopted, the temperature of high-temperature flue gas at an inlet is 130-160 ℃, the temperature of low-temperature flue gas at an outlet is reduced to be below 110 ℃, and the temperature of primary hot air at an outlet is above 100 ℃.
4. The coal-fired unit coupling primary air heat exchange and low-grade flue gas waste heat grading utilization device according to claim 1, characterized in that: the rotary air preheater (2) is a three-bin rotary air preheater, and primary hot air enters an original primary air bin of the rotary air preheater (2) and is heated to form secondary hot air with the temperature of more than 300 ℃.
5. The coal-fired unit coupling primary air heat exchange and low-grade flue gas waste heat grading utilization device according to claim 1, characterized in that: the secondary heat exchanger (9.3) is a high-temperature gas-water tubular heat exchanger, a high-efficiency finned tubular heat exchanger is adopted, and secondary hot air enters the secondary heat exchanger (9.3) to heat feed water to over 180 ℃ to form tertiary hot air with the temperature of 140-160 ℃.
6. The coal-fired unit coupling primary air heat exchange and low-grade flue gas waste heat grading utilization device according to claim 1, characterized in that: the third-stage heat exchanger (9.4) is a low-temperature gas-water tubular heat exchanger, and a high-efficiency finned tubular heat exchanger is adopted to heat the condensed water to more than 80 ℃ to form four-stage hot air with the temperature of 50-70 ℃.
7. The coal-fired unit coupling primary air heat exchange and low-grade flue gas waste heat grading utilization device according to claim 2, characterized in that: the bypass air preheater (10.2) is a primary air plate type air preheater and adopts a high-efficiency finned plate type heat exchanger, the temperature of high-temperature flue gas at an inlet is 50-70 ℃, the temperature of low-temperature flue gas at an outlet is reduced to be below 150 ℃, and the temperature of hot air at an outlet is 310-330 ℃.
8. The coal-fired unit coupling primary air heat exchange and low-grade flue gas waste heat grading utilization device according to any one of claims 1 to 7, characterized in that: valves are arranged on the first branch pipe (9.6), the second branch pipe (9.7) and the air preheater bypass air pipe (10.1).
9. The coal-fired unit coupling primary air heat exchange and low-grade flue gas waste heat grading utilization device according to claim 8, characterized in that: and valves are respectively arranged on outlet air pipes of the boiler blower (1) and the primary fan (7.1) and on inlet pipes and outlet pipes of the primary heat exchanger (9.2).
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| CN202020509979.6U CN212108481U (en) | 2020-04-09 | 2020-04-09 | Coal-fired unit coupling primary air heat exchange and low-grade flue gas waste heat grading utilization device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111425883A (en) * | 2020-04-09 | 2020-07-17 | 北京国电龙源环保工程有限公司 | Coupling primary air heat exchange and flue gas waste heat grading utilization device and method |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111425883A (en) * | 2020-04-09 | 2020-07-17 | 北京国电龙源环保工程有限公司 | Coupling primary air heat exchange and flue gas waste heat grading utilization device and method |
| CN111425883B (en) * | 2020-04-09 | 2024-07-23 | 国能龙源环保有限公司 | Device and method for coupling primary air heat exchange and flue gas waste heat grading utilization |
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