Energy station system constructed by utilizing boiler economizer

Abstract

The utility model relates to the technical field of waste heat utilization of boiler economizers, and particularly discloses an energy station system constructed by utilizing the boiler economizers, which comprises an economizer arranged on a smoke exhaust pipeline and connected with heat utilization equipment through a hot water circulation pipeline. The heat utilization equipment is one of power generation equipment, a flash tank, a hot water type absorption refrigerator and a hot water type absorption heat pump. Heat energy of hot water in the coal economizer on the smoke exhaust pipeline of the boiler can be used for generating electricity, making steam, refrigerating and making hot water, waste heat is fully utilized, and waste of the waste heat is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat utilization of boiler economizers, in particular to an energy station system constructed by utilizing boiler economizers. Background Art

[0002] Economizer is a device used to reduce the exhaust gas temperature of the boiler. It is usually installed at the rear of the boiler exhaust pipe. It exchanges the heat in the flue gas with the feed water entering the boiler, thereby reducing the exhaust gas temperature, increasing the feed water temperature, improving thermal efficiency, and reducing fuel consumption. Economizers are mainly used in industrial boilers and civil boilers such as coal-fired and oil-fired boilers.

[0003] The economizer of a coal-fired boiler is generally installed behind the dust collector and in front of the desulfurization tower. The inlet flue gas temperature of the economizer is about 150°C, the outlet temperature is about 110-90°C, and the temperature of the circulating water in the heat exchange tube of the economizer is about 80-130°C. In the prior art, the heat of the circulating water in the economizer is mainly used to heat the boiler's feed water. Only a part of this heat is used, and most of the heat is discharged, resulting in a large amount of heat loss. Utility Model Content

[0004] The utility model solves the problem that the waste heat of a boiler economizer cannot be effectively utilized and provides an energy station system constructed by using the heat of the boiler economizer to generate electricity, make steam, refrigerate and make hot water.

[0005] In order to solve the above technical problems, the utility model includes an economizer arranged on the smoke exhaust pipe, and the economizer is connected to the heat-using equipment through a hot water circulation pipeline. Its structural characteristics are: the heat-using equipment is one of power generation equipment, flash tank, hot water absorption refrigerator, and hot water absorption heat pump;

[0006] When the heat-using equipment is a power generation equipment, the economizer is connected to a generator set heat exchanger for heating a heat-absorbing medium through a hot water circulation pipeline, the generator set heat exchanger is connected to a low-temperature generator set through a heat-absorbing medium circulation pipeline, and the low-temperature generator set is also connected to a first cooling tower through a circulating cooling pipeline;

[0007] When the heat-using device is a flash tank, the flash tank is connected to a tap water pipe for water supply, the top of the flash tank is connected to a steam user through a steam discharge pipe, and the steam discharge pipe is provided with a first water vapor compressor for extracting and compressing the steam generated by the flash tank;

[0008] When the heat-using device is a hot water absorption refrigerator, the hot water absorption refrigerator is connected to the second cooling tower through a cooling circulation pipeline, and the hot water absorption refrigerator is also connected to a cold water user through a refrigeration circulation pipeline;

[0009] When the heat-using equipment is a hot water absorption heat pump, the hot water absorption heat pump is connected to the waste heat exchanger arranged at the rear end of the desulfurization tower on the flue gas exhaust pipe through a waste heat circulation pipeline, and the hot water absorption heat pump is also connected to the hot water user through a hot water circulation pipeline.

[0010] After adopting the above structure, the economizer absorbs the waste heat of the flue gas on the exhaust duct to obtain high-temperature hot water, and the high-temperature hot water circulates between the economizer and the heat-using equipment. The heat-using equipment uses the thermal energy in the hot water as energy to generate electricity, make steam, refrigerate, and make hot water. The hot water cooled after absorbing heat from the heat-using equipment flows back to the economizer, and absorbs the waste heat of the flue gas again to raise the temperature. When the thermal energy of the economizer is used to generate electricity, the heat-using equipment adopts the power generation equipment, which includes a heat exchanger for a generator set and a low-temperature generator set. The high-temperature hot water obtained by the economizer absorbing the waste heat of the flue gas exchanges heat with the heat exchanger for the generator set through a hot water circulation pipeline. The heat-absorbing medium of the power generation equipment expands after absorbing heat, which drives the low-temperature generator set to generate electricity. The first cooling tower cools the low-temperature generator set through a circulating cooling pipeline. When utilizing the thermal energy of the economizer to generate steam, a flash tank is used as the heat-using equipment. Tap water enters the flash tank through the tap water inlet pipe. After entering the flash tank, the tap water exchanges heat with the hot water in the economizer to increase its temperature and generate steam. Under the suction action of the first water vapor compressor, the flash tank is under negative pressure, and the water will boil and accelerate the rate of steam generation. The hot water in the economizer absorbs heat in the flash tank and then flows back to the economizer to absorb heat and increase its temperature. The steam generated in the flash tank is discharged through the steam exhaust pipe at the top. The steam is compressed by the first water vapor to increase its temperature and pressure and then supplied to steam users. When economizer is used for cooling, hot water absorption refrigerator is used as heat-using equipment. Hot water absorption refrigerator absorbs heat from hot water from economizer for cooling, and provides circulating cold water for cold water users who need circulating cold water. Hot water absorption refrigerator is connected with cold water users through cold water circulation pipeline. Cold water cooled by hot water absorption refrigerator enters cold water users through refrigeration circulation pipeline. The water heated after passing through cold water users enters hot water absorption refrigerator through refrigeration circulation pipeline to be cooled again and circulates. When using the economizer to make hot water, the heat-using equipment adopts a hot water absorption heat pump. The hot water absorption heat pump absorbs the heat from the hot water from the economizer and the waste heat exchanger to heat the water to obtain hot water with a temperature higher than the temperature of the hot water in the waste heat exchanger and lower than the temperature of the hot water circulating in the economizer. The hot water absorption heat pump is connected to the hot water user through a hot water circulation pipeline. The hot water heated by the hot water absorption heat pump enters the hot water user through the hot water circulation pipeline. The water cooled after passing through the hot water user enters the hot water absorption heat pump through the hot water circulation pipeline to be heated and heated again, and circulates. The system of the utility model can use the thermal energy of the water in the boiler economizer to generate electricity, make steam, refrigerate, and make hot water, making full use of waste heat, and is suitable for systems with coal-fired boiler economizers.

[0011] A first circulation pump for driving the circulation of hot water is provided on the hot water circulation pipeline between the economizer and the heat-consuming equipment.

[0012] The tap water pipe is provided with a water processor for purifying the tap water.

[0013] A second steam compressor for compressing the steam, increasing the temperature and pressure, is provided on the steam discharge pipe through which the steam compressed by the first steam compressor is discharged.

[0014] A steam mixing tank for heating the steam is disposed on the steam discharge pipe for discharging the steam compressed by the first steam compressor, and the steam mixing tank is connected to an external steam inlet pipe for external steam to enter.

[0015] The utility model utilizes an energy station system constructed by a boiler economizer, and uses the thermal energy of hot water in the economizer as energy for a low-temperature generator set, a flash tank, a hot water absorption refrigerator, and a hot water absorption heat pump to generate electricity, make steam, refrigerate, and make hot water, thereby fully utilizing the waste heat in the hot water in the economizer, reducing waste heat loss and energy consumption, and is suitable for systems equipped with coal-fired boiler economizers. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of Example 1;

[0017] Figure 2 It is a structural schematic diagram of Example 2;

[0018] Figure 3 It is a structural schematic diagram of Example 3;

[0019] Figure 4 It is a structural schematic diagram of Example 4;

[0020] Figure 5 It is a structural schematic diagram of Example 5;

[0021] In the figure: 1, economizer; 11, first hot water supply pipe; 12, first hot water return pipe; 121, first circulation pump; 2, generator set heat exchanger; 3, low temperature generator set; 31, heat absorbing medium return pipe; 311, second circulation pump; 32, heat absorbing medium inlet pipe; 4, first cooling tower; 41, first cooling water inlet pipe; 411, third circulation pump; 42, first cooling water return pipe; 5, flash tank; 51, tap water inlet pipe; 511, water treatment ; 52, steam discharge pipe; 521, first water vapor compressor; 522, second water vapor compressor; 523, steam mixing tank; 524, external steam pipe; 6, steam user; 7, hot water absorption chiller; 8, cold water user; 81, cold water return pipe; 82, cold water supply pipe; 9, second cooling tower; 91, second cooling water inlet pipe; 911, fourth circulating pump; 92, second cooling water return pipe; 10, hot water absorption heat pump; 13, waste heat exchanger; 131, waste heat supply pipe; 132, waste heat return pipe; 14, hot water user; 141, second hot water return pipe; 142, second hot water supply pipe; 100, smoke exhaust pipe; 101, desulfurization tower; 102, chimney. DETAILED DESCRIPTION Example 1

[0022] Reference Figure 1 A power generation system constructed by using a boiler economizer includes an economizer 1 arranged on a smoke exhaust pipe 100 of a coal-fired boiler. The economizer 1 is connected to the power generation equipment through a hot water circulation pipeline. The hot water circulation pipeline includes a first hot water supply pipe 11 and a first hot water return pipe 12. The first hot water supply pipe 11 and the first hot water return pipe 12 are both connected to the economizer 1 and the power generation equipment. The hot water heated up by the economizer 1 after absorbing the waste heat of the flue gas enters the power generation equipment through the first hot water supply pipe 11. The hot water cooled down by the power generation equipment after absorbing the heat in the hot water flows back to the economizer 1 through the first hot water return pipe 12 to absorb heat and heat up again. The first hot water return pipe 12 is provided with a first circulation pump 121 for driving the circulation of hot water. Figure 1 As shown, the power generation equipment includes a generator set heat exchanger 2 and a low-temperature generator set 3. The economizer 1 is connected to the generator set heat exchanger 2 through a hot water circulation pipeline. The generator set heat exchanger 2 and the low-temperature generator set 3 are connected through a heat absorbing medium circulation pipeline. Specifically, the heat absorbing medium circulation pipeline includes a heat absorbing medium return pipe 31 and a heat absorbing medium inlet pipe 32. The heat absorbing medium return pipe 31 and the heat absorbing medium inlet pipe 32 are both connected to the generator set heat exchanger 2 and the low-temperature generator set 3. The heat absorbing medium of the power generation equipment absorbs the heat from the hot water from the economizer 1 through the generator set heat exchanger 2 and expands and vaporizes, and enters the low-temperature generator set 3 through the heat absorbing medium inlet pipe 32. The heat absorbing medium that has been cooled after passing through the low-temperature generator set 3 enters the generator set heat exchanger 2 through the heat absorbing medium return pipe 31 to be heated and heated. The heat absorbing medium return pipe 31 is provided with a second circulation pump 311 for driving the circulation of the heat absorbing medium. Figure 1 As shown, the low-temperature generator set 3 is also connected to the first cooling tower 4 through a circulating cooling pipeline. Specifically, a first cooling water inlet pipe 41 and a first cooling water return pipe 42 are provided between the low-temperature generator set 3 and the first cooling tower 4. The circulating cooling water circulates between the low-temperature generator set 3 and the first cooling tower 4 through the first cooling water inlet pipe 41 and the first cooling water return pipe 42 to cool the low-temperature generator set 3. The first cooling water inlet pipe 41 is provided with a third circulating pump 411 for driving the circulating flow of cooling water. The low-temperature generator set 3 is also called a low-temperature waste heat generator set or a low-temperature waste heat boiler. It can generate electricity using waste heat as low as 60-70°C. The structure and principle of the low-temperature generator set 3 are similar to the existing ones and are not described in detail here.

[0023] Working process: Taking the 130℃ hot water power generation in the economizer 1 of the power plant boiler as an example, the high-temperature hot water of 130℃ enters the generator set heat exchanger 2 through the first hot water supply pipe 11. The heat-absorbing medium absorbs the heat in the hot water from the economizer 1 when passing through the generator set heat exchanger 2, and then expands and gasifies to generate high-pressure steam. The high-pressure steam drives the steam turbine (not shown in the figure) to rotate through the heat-absorbing medium inlet pipe 32, driving the low-temperature generator set 3 to generate electricity. The generated electricity can be used for self-use or connected to the Internet. The heat-absorbing medium that has been cooled after power generation enters the generator set heat exchanger 2 through the heat-absorbing medium return pipe 31. The temperature is increased again by absorbing heat, and the first cooling tower 4 cools down the low-temperature generator set 3. The cooling water at 32°C enters the low-temperature generator set 3 through the first cooling water inlet pipe 41 to cool down the low-temperature generator set 3. The temperature of the cooling water rises to 35°C, and flows back to the first cooling tower 4 through the first cooling water return pipe 42 for further cooling. The first cooling tower 4 can use the existing cooling tower in the power plant to save investment, or it can be self-built; after the heat exchanger 2 of the generator set releases heat, the temperature of the hot water drops to 80°C, and flows back to the economizer 1 through the first hot water return pipe 12 for further heating. Example 2

[0024] Reference Figure 2 A steam production system constructed by using a boiler economizer includes an economizer 1 arranged on a smoke exhaust duct 100 of a coal-fired boiler. The economizer 1 is connected to a flash tank 5 through a hot water circulation pipeline. The hot water circulation pipeline includes a first hot water supply pipe 11 and a first hot water return pipe 12. The first hot water supply pipe 11 and the first hot water return pipe 12 are both connected to the economizer 1 and the flash tank 5. The hot water heated up by the economizer 1 after absorbing the waste heat of the flue gas enters the flash tank 5 through the first hot water supply pipe 11. The hot water cooled down by the flash tank 5 after absorbing the heat in the hot water flows back to the economizer 1 through the first hot water return pipe 12 to absorb heat and heat up again. The first hot water return pipe 12 is provided with a first circulation pump 121 for driving the circulation of hot water. A heat exchange device is provided inside the flash tank 5 to heat and evaporate the water to generate steam. Its structure and principle are prior art and are not described in detail here. Figure 2As shown, the flash tank 5 is connected to a tap water pipe 51 for water entry, the tap water pipe 51 is provided with a water processor 511 for purifying tap water, the top of the flash tank 5 is connected to a steam exhaust pipe 52 for steam exhaust, the steam exhaust pipe 52 is connected to a steam user 6, the steam exhaust pipe 52 is provided with a first water vapor compressor 521 and a second water vapor compressor 522 which are sequentially arranged along the steam flow direction, the first water vapor compressor 521 extracts the steam generated by the flash tank 5 to put the flash tank 5 in a negative pressure state, the boiling point of water is reduced and it is easy to boil, and the steam generation rate is increased, the first water vapor compressor 521 compresses the steam, the temperature and pressure of the steam are increased, and the steam reflux can be prevented, the second water vapor compressor 522 continues to compress the steam discharged from the first water vapor compressor 521 to increase the temperature and pressure.

[0025] Working process: Taking the production of 160℃ steam from 130℃ hot water in the economizer 1 of the power plant boiler as an example, the high-temperature hot water of 130℃ enters the flash tank 5 through the first hot water supply pipe 11, and the purified tap water enters the flash tank 5 through the tap water supply pipe 51. The water absorbs the heat from the hot water from the economizer 1 in the flash tank 5 and evaporates. The first steam compressor 521 extracts the steam. Under the suction action of the first steam compressor 521, the flash tank 5 is under negative pressure, the water is easy to boil and the generation of steam is accelerated. The temperature of the steam discharged through the steam discharge pipe 52 is about 75℃. After being compressed by the first steam compressor 521, the temperature rises to about 120℃. After being compressed by the second steam compressor 522, the temperature is obtained to obtain saturated steam of 160℃, and then it is transported to the steam user 6; after releasing heat in the flash tank 5, the temperature of the hot water drops to 80℃, and it flows back to the economizer 1 through the first hot water return pipe 12 to be heated again. Example 3

[0026] Reference Figure 3 , a steam making system constructed by using a boiler economizer, this embodiment is basically the same as embodiment 2, except that: a steam mixing tank 523 is used to replace the second water vapor compressor 522 on the steam exhaust pipe 52, the steam mixing tank 523 is also connected to an external steam inlet pipe 524 for external steam to enter, the temperature of the external steam is higher than the temperature of the steam generated by the flash tank 5, the external steam is mixed with the steam generated by the flash tank 5 in the steam mixing tank 523, and the temperature of the steam generated by the flash tank 5 is increased. This embodiment is suitable for the situation where there is high-temperature external steam, for example, 320°C high-temperature steam is passed into the steam mixing tank 523 and mixed with the steam generated by the flash tank 5 to obtain 160°C saturated steam. Example 4

[0027] Reference Figure 4A refrigeration system constructed using a boiler economizer includes an economizer 1 arranged on a smoke exhaust duct 100 of a coal-fired boiler. The economizer 1 is connected to a hot water absorption refrigerator 7 through a hot water circulation pipeline. The hot water circulation pipeline includes a first hot water supply pipe 11 and a first hot water return pipe 12. The first hot water supply pipe 11 and the first hot water return pipe 12 are both connected to the economizer 1 and the hot water absorption refrigerator 7. The hot water heated up by the economizer 1 after absorbing the waste heat of flue gas enters the hot water absorption refrigerator 7 through the first hot water supply pipe 11. The hot water cooled down by the hot water absorption refrigerator 7 after absorbing the heat in the hot water flows back to the economizer 1 through the first hot water return pipe 12 to absorb heat and heat up again. The first hot water return pipe 12 is provided with a first circulation pump 121 for driving the circulation of hot water. Figure 4 As shown, the hot water absorption chiller 7 is connected to the cold water user 8 through a refrigeration cycle pipeline. Specifically, the refrigeration cycle pipeline includes a cold water return pipe 81 and a cold water supply pipe 82. The cold water return pipe 81 and the cold water supply pipe 82 are both connected to the hot water absorption chiller 7 and the cold water user 8. The hot water absorption chiller 7 uses the heat in the hot water from the economizer 1 as energy to cool the water in the refrigeration cycle pipeline. The obtained cold water enters the cold water user 8 through the cold water supply pipe 82. The water heated after passing through the cold water user 8 returns to the hot water absorption chiller 7 through the cold water return pipe 81 to be cooled again. Figure 4 As shown, the hot water absorption refrigerator 7 is also connected to the second cooling tower 9 through a circulating cooling pipeline. Specifically, a second cooling water inlet pipe 91 and a second cooling water return pipe 92 are provided between the hot water absorption refrigerator 7 and the second cooling tower 9. The circulating cold water circulates between the hot water absorption refrigerator 7 and the second cooling tower 9 through the second cooling water inlet pipe 91 and the second cooling water return pipe 92 to cool the hot water absorption refrigerator 7. The second cooling water inlet pipe 91 is provided with a fourth circulating pump 911 for driving the circulation of cold water. The hot water absorption refrigerator 7 usually adopts a lithium bromide absorption refrigeration unit, and its structure and principle are prior art and are not described in detail herein.

[0028] Working process: Take the example of producing 7-12℃ circulating cold water from 130℃ hot water in the economizer 1 of the power plant boiler, the high temperature hot water of 130℃ enters the hot water absorption refrigerator 7 through the first hot water supply pipe 11, the hot water absorption refrigerator 7 uses the heat energy of the hot water from the economizer 1 to cool the water in the refrigeration cycle pipeline, the circulating cold water temperature entering the hot water absorption refrigerator 7 through the cold water return pipe 81 is 12℃, and the temperature drops to 7℃ after passing through the hot water absorption refrigerator 7. The cooled cold water is refrigerated for the cold water user 8 through the cold water supply pipe 82, and the first The second cooling tower 9 cools down the hot water absorption refrigerator 7. The cooling water at 32°C enters the hot water absorption refrigerator 7 through the second cooling water inlet pipe 91 to cool down the hot water absorption refrigerator 7. The temperature of the cooling water rises to 35°C and flows back to the second cooling tower 9 through the second cooling water return pipe 92 to be cooled again. The second cooling tower 9 can use the existing cooling tower of the power plant to save investment, or it can be self-built. After the hot water absorption refrigerator 7 releases heat, the temperature of the hot water drops to 80°C, and flows back to the economizer 1 through the first hot water return pipe 12 to be heated again. Example 5

[0029] Reference Figure 5A hot water making system constructed by using a boiler economizer comprises an economizer 1 arranged on a smoke exhaust pipe 100 of a coal-fired boiler, a desulfurization tower 101 is also arranged on the smoke exhaust pipe 100, the economizer 1 is arranged at the front end of the desulfurization tower 101, a waste heat exchanger 13 is also arranged on the smoke exhaust pipe 100 at the rear end of the desulfurization tower 101, a chimney 102 is arranged at the end of the smoke exhaust pipe 100, the front end and the rear end of the desulfurization tower 101 are determined by the flow direction of the flue gas entering the desulfurization tower 101, and the front end of the desulfurization tower 101 refers to the flue gas The end where the flue gas enters the tower, the rear end of the desulfurization tower 101 refers to the end where the flue gas is discharged from the tower after desulfurization, and the desulfurization tower 101 does not belong to the scope of the present utility model; the economizer 1 is connected to the hot water absorption heat pump 10 through a hot water circulation pipeline, and the hot water circulation pipeline includes a first hot water supply pipe 11 and a first hot water return pipe 12. The first hot water supply pipe 11 and the first hot water return pipe 12 are both connected to the economizer 1 and the hot water absorption heat pump 10. The hot water heated by the economizer 1 after absorbing the waste heat of the flue gas is heated by the first hot water supply pipe 11. 1 enters the hot water absorption heat pump 10, and the hot water that is cooled after absorbing heat from the hot water flows back to the economizer 1 through the first hot water return pipe 12 to absorb heat and heat up again. The first hot water return pipe 12 is provided with a first circulation pump 121 for driving the hot water to circulate. The hot water absorption heat pump 10 is also connected to the waste heat heat exchanger 13 through a waste heat circulation pipeline, and the waste heat circulation pipeline includes a waste heat water supply pipe 131 and a waste heat return pipe 132. They are all connected to the waste heat exchanger 13 and the hot water absorption heat pump 10. The waste heat exchanger 13 absorbs the waste heat in the flue gas after the desulfurization tower 101 to heat the water. Of course, the waste heat exchanger 13 can also absorb the waste heat in the desulfurization slurry of the desulfurization tower 101. The hot water heated by the waste heat exchanger 13 enters the hot water absorption heat pump 10 through the waste heat water supply pipe 131. The hot water cooled after the hot water absorption heat pump 10 absorbs the heat in the hot water flows back to the waste heat exchanger 13 through the waste heat return pipe 132 to absorb heat again. Figure 5 As shown, the hot water absorption heat pump 10 is connected to the hot water user 14 through a hot water circulation pipeline. Specifically, the hot water circulation pipeline includes a second hot water return pipe 141 and a second hot water supply pipe 142. The second hot water return pipe 141 and the second hot water supply pipe 142 are both connected to the hot water absorption heat pump 10 and the hot water user 14. The hot water absorption heat pump 10 uses the heat in the hot water from the economizer 1 and the waste heat exchanger 13 as energy to heat the water in the hot water circulation pipeline. The obtained hot water enters the hot water user 14 through the second hot water supply pipe 142. The water cooled after passing through the hot water user 14 returns to the hot water absorption heat pump 10 through the second hot water return pipe 141 to be heated again. The hot water absorption heat pump 10 can adopt a lithium bromide absorption heat pump unit, whose structure and principle are prior art and are not described in detail here.

[0030] Working process: Taking the 130℃ hot water in the economizer 1 of the power plant boiler and the 25℃ hot water in the waste heat exchanger 13 to produce 60-70℃ circulating hot water as an example, the 130℃ high-temperature hot water enters the hot water absorption heat pump 10 through the first hot water supply pipe 11, and the 25℃ low-temperature hot water enters the hot water absorption heat pump 10 through the waste heat supply pipe 131. The hot water absorption heat pump 10 absorbs the heat energy of the hot water from the economizer 1 and the waste heat exchanger 13 to heat the water in the hot water circulation pipeline. The circulating hot water temperature entering the hot water absorption heat pump 10 through the second hot water return pipe 141 is 6 The temperature of the hot water in the waste heat exchanger 13 drops to 0℃, and after passing through the hot water absorption heat pump 10, it rises to 70℃, which is higher than the temperature of the hot water in the waste heat exchanger 13 and lower than the temperature of the hot water in the economizer 1. The heated hot water is supplied to the hot water user 14 via the second hot water supply pipe 142; the hot water in the economizer 1 drops to 80℃ after heat release by the hot water absorption heat pump 10, and flows back to the economizer 1 via the first hot water return pipe 12 to be heated again; the hot water in the waste heat exchanger 13 drops to 20℃ after heat release by the hot water absorption heat pump 10, and flows back to the waste heat exchanger 13 via the waste heat return pipe 132 to be heated again.

[0031] The utility model utilizes the energy station system constructed by the boiler economizer to be able to use the thermal energy of the hot water in the boiler economizer as energy for power generation, steam production, refrigeration, and hot water production, so that the thermal energy of the hot water in the boiler economizer is fully utilized, the thermal energy waste of the economizer is reduced, energy is saved and consumption is reduced, and the user's electricity consumption, steam production, refrigeration, and hot water production costs are reduced. The utility model is suitable for systems equipped with coal-fired boiler economizers in power plants and the like.

Claims

1. An energy station system constructed using a boiler economizer, comprising an economizer (1) arranged on a smoke exhaust pipe (100), wherein the economizer (1) is connected to a heat-using device via a hot water circulation pipeline, and wherein: The heat-using equipment is one of power generation equipment, a flash tank (5), a hot water absorption refrigerator (7), and a hot water absorption heat pump (10); When the heat-using equipment is a power generation equipment, the economizer (1) is connected to a generator set heat exchanger (2) for heating a heat-absorbing medium via a hot water circulation pipeline, the generator set heat exchanger (2) is connected to a low-temperature generator set (3) via a heat-absorbing medium circulation pipeline, and the low-temperature generator set (3) is also connected to a first cooling tower (4) via a circulation cooling pipeline; When the heat-using device is a flash tank (5), the flash tank (5) is connected to a tap water pipe (51) for water supply, the top of the flash tank (5) is connected to a steam user (6) via a steam discharge pipe (52), and the steam discharge pipe (52) is provided with a first water vapor compressor (521) for extracting and compressing steam generated by the flash tank (5); When the heat-using device is a hot water absorption refrigerator (7), the hot water absorption refrigerator (7) is connected to the second cooling tower (9) via a cooling circulation pipeline, and the hot water absorption refrigerator (7) is also connected to a cold water user (8) via a refrigeration circulation pipeline; When the heat-using equipment is a hot water absorption heat pump (10), the hot water absorption heat pump (10) is connected to a waste heat exchanger (13) arranged at the rear end of a desulfurization tower (101) on a smoke exhaust pipe (100) via a waste heat circulation pipeline, and the hot water absorption heat pump (10) is also connected to a hot water user (14) via a hot water circulation pipeline.

2. The energy station system constructed using a boiler economizer according to claim 1 is characterized in that: A first circulation pump (121) for driving the circulation of hot water is provided on the hot water circulation pipeline between the economizer (1) and the heat-consuming equipment.

3. The energy station system constructed by using a boiler economizer according to claim 1 is characterized in that: The tap water supply pipe (51) is provided with a water processor (511) for purifying the tap water.

4. The energy station system constructed by using a boiler economizer according to claim 1 is characterized in that: A second steam compressor (522) for compressing the steam, raising its temperature and pressure, is provided on the steam discharge pipe (52) through which the steam compressed by the first steam compressor (521) is discharged.

5. The energy station system constructed by using a boiler economizer according to claim 1 is characterized in that: A steam discharge pipe (52) for discharging steam compressed by the first water vapor compressor (521) is provided with a steam mixing tank (523) for heating the steam, and the steam mixing tank (523) is connected to an external steam inlet pipe (524) for external steam to enter.

Images