Exhaust steam recycling system of thermal deaerator

Abstract

The utility model discloses a dead steam recycling system of a thermal deaerator. The dead steam recycling system comprises a deoxidizing tower head, a deoxidizing water tank, a multi-medium heat exchanger, a chemical water treatment device, a sampling detection device and a pollution discharge cooling pool, a dead steam recovery pipeline, a condensed water input pipeline and a demineralized water input pipeline are connected between the deoxidizing tower head and the multi-medium heat exchanger, and a drain water output pipeline and a drain water recycling pipeline are connected between the deoxidizing water tank and the multi-medium heat exchanger; a demineralized water pipeline, a drainage output pipeline and a drainage retreatment pipeline are connected between the chemical water treatment device and the multi-medium heat exchanger, a condensed water bypass pipeline is connected between the condensed water pipeline and the condensed water input pipeline, and a demineralized water bypass pipeline is connected between the demineralized water pipeline and the demineralized water input pipeline. When the system is maintained, the production continuity is not influenced, multiple media can exchange heat at the same time, and the drained water after heat exchange can be recycled after being detected to be qualified.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of chemical production relates to a steam recovery system, specifically relates to a steam recovery system of thermal deaerator. BACKGROUND

[0002] The boiler needs a large amount of water to cool and circulate in the operation process, in this process, the oxygen in water will react with metal pipeline, resulting in pipeline corrosion, affect the service life of equipment, now commonly used thermal deaerator prevents oxygen corrosion by eliminating dissolved oxygen in feed water, protects the safety of equipment and prolongs its service life. However, thermal deaerator will produce a large amount of steam in the running process, steam will be directly dispersed generally, but steam contains a certain amount of heat and moisture, direct dispersion not only leads to energy waste, environmental heat pollution and noise pollution, also will form a large amount of " white fog " at the deaerator emptying port, affect the beauty of the surrounding environment, steam recovery device will recycle steam, avoid energy waste and environmental pollution, but the existing steam recovery device has the following problems:

[0003] 1, when the steam recovery device in steam heat exchanger equipment fails, then need to suspend all mechanical maintenance, will affect the continuity of production;

[0004] 2, steam heat exchanger in steam recovery device only exchanges heat with single condensate or desalted water, but the steam temperature produced by thermal deaerator is high, which will lead to certain heat resource waste;

[0005] 3, steam is condensed into drain after heat exchange through steam heat exchanger, usually without water quality detection directly through pipeline recycling to thermal deaerator, which will lead to the overall water quality in deaerating water tank is poor, and further affect the service life of the boiler. SUMMARY

[0006] In view of the deficiencies existing in the prior art, the utility model aims at providing a steam recovery system of thermal deaerator, which can solve the technical problems of affecting production continuity during maintenance, single heat exchange medium and undetectable water quality in the existing steam recovery system.

[0007] In order to solve the above technical problems, the utility model adopts the following technical scheme to realize:

[0008] A steam recovery system of thermal deaerator, comprising a thermal deaerator, the thermal deaerator comprises a deaerator tower head and a deaerating water tank connected with each other, characterized by further comprising a multi-medium heat exchanger and a chemical water treatment device.

[0009] The top of the deoxygenation tower head is provided with a steam exhaust outlet, and the sidewall of the deoxygenation tower head is provided with a first condensate water inlet and a first desalted water inlet; the deoxygenation water tank is provided with a drain inlet; the top of the multi-medium heat exchanger is provided with a steam exhaust inlet and a gas outlet, the bottom of the multi-medium heat exchanger is provided with a drain outlet, and the sidewall of the multi-medium heat exchanger is provided with a second condensate water inlet, a second desalted water inlet, a condensate water outlet and a desalted water outlet;

[0010] The steam exhaust outlet is connected with the steam exhaust inlet through a steam exhaust recovery pipeline, the gas outlet is connected with a gas discharge pipeline, the second condensate water inlet is connected with a condensate water pipeline, the condensate water outlet is connected with the first condensate water inlet through a condensate water input pipeline, the second desalted water inlet is connected with the chemical water treatment device through a desalted water pipeline, the desalted water outlet is connected with the first desalted water inlet through a desalted water input pipeline, and the drain outlet is connected with the drain inlet through a drain pipeline, and a booster pump is installed on the drain pipeline.

[0011] The condensate water pipeline and the condensate water input pipeline are connected with a condensate water bypass pipeline, and the desalted water pipeline and the desalted water input pipeline are connected with a desalted water bypass pipeline.

[0012] The utility model discloses still include following technical features:

[0013] The steam exhaust recovery pipeline and the gas discharge pipeline are connected with a steam exhaust venting pipeline.

[0014] The drain pipeline comprises a drain output pipeline, a drain recycling pipeline and a drain reprocessing pipeline, one end of the drain output pipeline, the drain recycling pipeline and the drain reprocessing pipeline is connected, the other end of the drain output pipeline is connected with the drain outlet in communication, the other end of the drain recycling pipeline is connected with the drain inlet in communication, and the drain reprocessing pipeline is connected with the chemical water treatment device in communication.

[0015] The booster pump is installed on the drain recycling pipeline.

[0016] Further comprising a sampling detection device, the sampling detection device is connected with the drain output pipeline through a drain sampling pipeline.

[0017] Further comprising a blowdown cooling pool, the blowdown cooling pool is connected with the drain output pipeline through a drain pipe.

[0018] The multi-medium heat exchanger comprises a condensate water heat exchange tank body and a desalted water heat exchange tank body, the bottom of the condensate water heat exchange tank body is communicated with the top of the desalted water heat exchange tank body, the interiors of the condensate water heat exchange tank body and the desalted water heat exchange tank body are all divided into S-shaped channels by a partition plate, the S-shaped channel of the condensate water heat exchange tank body is provided with condensate water heat exchange pipes, and the S-shaped channel of the desalted water heat exchange tank body is provided with desalted water heat exchange pipes.

[0019] One end of the condensate water heat exchange pipe is communicated with the second condensate water inlet, the other end of the condensate water heat exchange pipe is communicated with the condensate water outlet, one end of the desalted water heat exchange pipe is communicated with the second desalted water inlet, and the other end of the desalted water heat exchange pipe is communicated with the desalted water outlet.

[0020] The condensate water heat exchange pipe and the desalted water heat exchange pipe are both formed by a plurality of U-shaped pipes connected at equal intervals.

[0021] The waste steam recovery pipeline is provided with a first valve, the air release pipeline is provided with a second valve, the two ends of the waste steam venting pipeline are respectively close to the inlet end of the first valve and the outlet end of the second valve, the waste steam venting pipeline is provided with a third valve, the condensate water pipeline is provided with a fourth valve, the condensate water input pipeline is provided with a fifth valve, the two ends of the condensate water bypass pipeline are respectively close to the inlet end of the fourth valve and the outlet end of the fifth valve, the condensate water bypass pipeline is provided with a sixth valve, the desalted water pipeline is provided with a seventh valve, the desalted water input pipeline is provided with an eighth valve, the two ends of the desalted water bypass pipeline are respectively close to the inlet end of the seventh valve and the outlet end of the eighth valve, the desalted water bypass pipeline is provided with a ninth valve, the steam reuse pipeline between the booster pump and the steam output pipeline is provided with a tenth valve, the steam reuse pipeline between the booster pump and the steam inlet is provided with an eleventh valve and a twelfth valve, the steam reprocessing pipeline is provided with a thirteenth valve, the steam sampling pipeline is provided with a fourteenth valve, and the water release pipeline is provided with a fifteenth valve.

[0022] Compared with the prior art, the utility model has the following technical effects:

[0023] (Ⅰ) The structure design and working principle of the multi-medium heat exchanger arranged in the waste steam recycling system can simultaneously introduce waste steam, condensate water and desalted water, fully utilize the temperature difference between the condensate water and the desalted water, and make the latent heat of the waste steam exchange with the condensate water and the desalted water in turn, so that the latent heat of the waste steam is fully utilized, the temperature of the condensate water and the desalted water is effectively improved, the efficient utilization of heat energy is realized, energy waste is reduced, the operation cost is reduced, and better conditions are provided for the subsequent process.

[0024] (II) The condensate bypass pipeline and the demineralized water bypass pipeline arranged in the steam recovery system, when the multi-medium heat exchanger needs to be overhauled or maintained, the condensate and the demineralized water can enter the deaerating tower head without passing through the multi-medium heat exchanger to carry out deaeration, so that damage to the multi-medium heat exchanger is avoided, and normal operation of the system is ensured.

[0025] (III) The sampling and detecting device arranged in the steam recovery system, water quality of the drain water generated after steam heat exchange and condensation is detected, if the detection result meets the boiler water quality requirement, the drain water is recovered to the deaerating water tank for utilization, so that water resource waste is reduced, and system operation cost is reduced; if the detection result does not meet the boiler water quality requirement, the drain water enters the chemical water treatment device through the drain water reprocessing pipeline to carry out re-purification treatment, until impurities and harmful substances in the drain water are effectively removed, so that the drain water meets the requirement of being used as demineralized water, and then the drain water reenters the system, so that normal operation of the system is ensured, water resource recycling is realized, and the environmental protection concept is embodied. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a running schematic view of the utility model.

[0027] The meanings of the various reference numerals in the drawing are as follows:

[0028] 1, deaerating tower head, 2, deaerating water tank, 3, multi-medium heat exchanger, 4, chemical water treatment device, 5, steam recovery pipeline, 6, air release pipeline, 7, condensate pipeline, 8, condensate input pipeline, 9, demineralized water pipeline, 10, demineralized water input pipeline, 11, drain water pipeline, 12, booster pump, 13, condensate bypass pipeline, 14, demineralized water bypass pipeline, 15, steam venting pipeline, 16, sampling and detecting device, 17, drain water sampling pipeline, 18, blowdown cooling pool, 19, water release pipeline, 20, No. 1 valve, 21, No. 2 valve, 22, No. 3 valve, 23, No. 4 valve, 24, No. 5 valve, 25, No. 6 valve, 26, No. 7 valve, 27, No. 8 valve, 28, No. 9 valve, 29, No. 10 valve, 30, No. 11 valve, 31, No. 12 valve, 32, No. 13 valve, 33, No. 14 valve, 34, No. 15 valve;

[0029] 1-1, steam outlet, 1-2, first condensate inlet, 1-3, first demineralized water inlet;

[0030] 2-1, drain water inlet;

[0031] 3-1, steam exhaust inlet, 3-2, gas outlet, 3-3, water outlet, 3-4, second condensate water inlet, 3-5, second desalted water inlet, 3-6, condensate water outlet, 3-7, desalted water outlet, 3-8, condensate water heat exchange tank, 3-9, desalted water heat exchange tank, 3-10, partition, 3-11, condensate water heat exchange pipe, 3-12, desalted water heat exchange pipe;

[0032] 11-1, water outlet pipeline, 11-2, water recycling pipeline, 11-3, water reprocessing pipeline.

[0033] The specific content of the utility model is further explained and described in detail in combination with the embodiments. Specific implementation

[0034] According to the above technical solution, the specific embodiments of the utility model are given below, and it should be noted that the utility model is not limited to the following specific embodiments, and any equivalent transformation based on the technical solution of the application falls within the protection scope of the utility model.

[0035] In the utility model, unless otherwise stated, the orientation words such as 'up', 'down', 'left', 'right' and the like are usually defined with the drawing surface in the corresponding drawing as the reference, and 'inner' and 'outer' refer to the inner and outer of the outline of the corresponding components.

[0036] Embodiment:

[0037] This embodiment gives a kind of steam exhaust recycling system of thermal deaerator, as shown in Fig. Figure 1 It includes thermal deaerator, thermal deaerator includes deaerator tower head 1 and deaerator water tank 2 connected with each other, also includes multi-media heat exchanger 3 and chemical water treatment device 4;

[0038] The top of deaerator tower head 1 is provided with steam exhaust outlet 1-1, and the side wall of deaerator tower head 1 is provided with first condensate water inlet 1-2 and first desalted water inlet 1-3;Deaerator water tank 2 is provided with water inlet 2-1;The top of multi-media heat exchanger 3 is provided with steam exhaust inlet 3-1 and gas outlet 3-2, and the bottom of multi-media heat exchanger 3 is provided with water outlet 3-3, and the side wall of multi-media heat exchanger 3 is provided with second condensate water inlet 3-4, second desalted water inlet 3-5, condensate water outlet 3-6 and desalted water outlet 3-7;

[0039] The steam exhaust outlet 1-1 is connected with the steam exhaust inlet 3-1 through a steam exhaust recovery pipeline 5, the gas outlet 3-2 is connected with a gas discharge pipeline 6, the second condensate water inlet 3-4 is connected with a condensate water pipeline 7, the condensate water outlet 3-6 is connected with the first condensate water inlet 1-2 through a condensate water input pipeline 8, the second demineralized water inlet 3-5 is connected with the chemical water treatment device 4 through a demineralized water pipeline 9, the demineralized water outlet 3-7 is connected with the first demineralized water inlet 1-3 through a demineralized water input pipeline 10, the drain outlet 3-3 is connected with the drain inlet 2-1 through a drain pipeline 11, and the drain pipeline 11 is provided with a booster pump 12;

[0040] The condensate water pipeline 7 and the condensate water input pipeline 8 are connected with a condensate water bypass pipeline 13, and the demineralized water pipeline 9 and the demineralized water input pipeline 10 are connected with a demineralized water bypass pipeline 14.

[0041] In the embodiment, the steam exhaust generated by the deaerating tower head 1 enters the multi-medium heat exchanger 3 through the steam exhaust recovery pipeline 5, and the high temperature of the steam exhaust is used for heat exchange with the condensate water and the demineralized water in the multi-medium heat exchanger 3, respectively, so that the condensate water and the demineralized water after being heated are input into the deaerating tower head 1 through the condensate water input pipeline 8 and the demineralized water input pipeline 10 for deaeration, the steam exhaust is cooled and condensed to generate the drain after heat exchange, the drain can be recovered to the deaerating water tank 2 through the drain pipeline 11 and the booster pump 12 for reuse, and the gas that cannot be condensed is discharged to the atmosphere through the gas discharge pipeline 6. The process can more effectively recover and utilize the waste heat in the steam exhaust, thereby reducing the waste of energy and improving the thermal efficiency of the whole system. The further provided condensate water bypass pipeline 13 and demineralized water bypass pipeline 14 can ensure the normal operation of the system while avoiding damage to the multi-medium heat exchanger 3 when the multi-medium heat exchanger 3 needs to be overhauled or maintained, that is, the condensate water and the demineralized water do not enter the multi-medium heat exchanger 3 but enter the deaerating tower head 1 through the condensate water bypass pipeline 13 and the demineralized water bypass pipeline 14 for deaeration.

[0042] As a preferred scheme of the embodiment, the steam exhaust recovery pipeline 5 and the gas discharge pipeline 6 are connected with a steam exhaust venting pipeline 15 in the embodiment, and when the multi-medium heat exchanger 3 needs to be overhauled or maintained, the steam exhaust generated by the deaerating tower head 1 is sequentially discharged to the atmosphere through the steam exhaust recovery pipeline 5, the steam exhaust venting pipeline 15 and the gas discharge pipeline 6, thereby ensuring the safety of the whole system.

[0043] As a preferred scheme of the embodiment, the hydrophobic pipeline 11 in the embodiment comprises a hydrophobic output pipeline 11-1, a hydrophobic recycling pipeline 11-2 and a hydrophobic reprocessing pipeline 11-3, one ends of the hydrophobic output pipeline 11-1, the hydrophobic recycling pipeline 11-2 and the hydrophobic reprocessing pipeline 11-3 are connected, the other end of the hydrophobic output pipeline 11-1 is connected with the hydrophobic outlet 3-3, the other end of the hydrophobic recycling pipeline 11-2 is connected with the hydrophobic inlet 2-1, the hydrophobic reprocessing pipeline 11-3 is connected with the chemical water treatment device 4, and the booster pump 12 is installed on the hydrophobic recycling pipeline 11-2. The hydrophobic water can be sampled and detected through the hydrophobic output pipeline 11-1, if the detection is qualified, the hydrophobic water is recycled to the deaerated water tank 2 through the hydrophobic recycling pipeline 11-2 after being pressurized by the booster pump 12, if the detection is unqualified, the hydrophobic water is reprocessed in the chemical water treatment device 4 through the hydrophobic reprocessing pipeline 11-3, and the processed hydrophobic water is recycled in the system again as desalted water through the desalted water pipeline 9, so that the efficient use and recycling of water resources are realized, and remarkable economic benefits and environmental benefits are achieved.

[0044] As a preferred scheme of the embodiment, the embodiment further comprises a sampling and detecting device 16, a hydrophobic sampling pipeline 17 is connected between the sampling and detecting device 16 and the hydrophobic output pipeline 11-1, the hydrophobic water enters the sampling and detecting device 16 in sequence through the hydrophobic output pipeline 11-1 and the hydrophobic sampling pipeline 17 for water quality monitoring, if the detection result meets the boiler water quality requirement, the hydrophobic water enters the deaerated water tank 2 through the hydrophobic recycling pipeline 11-2 after being pressurized by the booster pump 12 for recycling, so that the waste of water resources is reduced and the operation cost of the system is reduced, if the detection result does not meet the boiler water quality requirement, the hydrophobic water enters the chemical water treatment device 4 through the hydrophobic reprocessing pipeline 11-3 for purification treatment, so that impurities and harmful substances in the hydrophobic water are effectively removed, the hydrophobic water meets the requirement of desalted water, and the hydrophobic water reenters the system, so that the normal operation of the system is ensured and the recycling of water resources is realized, and the environmental protection concept is embodied.

[0045] As a preferred scheme of the embodiment, the embodiment further comprises a blowdown cooling pool 18, a blowdown pipeline 19 is connected between the blowdown cooling pool 18 and the hydrophobic output pipeline 11-1, when the multi-medium heat exchanger 3 needs to be overhauled or maintained, the condensed hydrophobic water in the multi-medium heat exchanger 3 can be discharged into the blowdown cooling pool 18 through the blowdown pipeline 19, so that the environment is prevented from being polluted.

[0046] As a preferred scheme of the embodiment, the multi-medium heat exchanger 3 in the embodiment comprises a condensate heat exchange tank 3-8 and a demineralized water heat exchange tank 3-9, the bottom of the condensate heat exchange tank 3-8 is in communication with the top of the demineralized water heat exchange tank 3-9, the interiors of the condensate heat exchange tank 3-8 and the demineralized water heat exchange tank 3-9 are each divided into an S-shaped channel by a partition plate 3-10, the S-shaped channel of the condensate heat exchange tank 3-8 is provided with condensate heat exchange pipes 3-11, and the S-shaped channel of the demineralized water heat exchange tank 3-9 is provided with demineralized water heat exchange pipes 3-12.

[0047] One end of the condensate heat exchange pipes 3-11 is in communication with the second condensate inlet 3-4, the other end of the condensate heat exchange pipes 3-11 is in communication with the condensate outlet 3-6, one end of the demineralized water heat exchange pipes 3-12 is in communication with the second demineralized water inlet 3-5, and the other end of the demineralized water heat exchange pipes 3-12 is in communication with the demineralized water outlet 3-7.

[0048] The unique design of the multi-medium heat exchanger 3 can introduce the exhaust steam, the condensate and the demineralized water into the multi-medium heat exchanger 3 at the same time, the condensate heat exchange tank 3-8 is arranged above the demineralized water heat exchange tank 3-9 due to the temperature difference between the condensate and the demineralized water, the exhaust steam in the multi-medium heat exchanger 3 is heat-exchanged before the condensate with higher temperature, the condensate in the condensate heat exchange pipes 3-11 is further heated, the exhaust steam loses part of heat energy and is heat-exchanged with the demineralized water with lower temperature, the remaining heat of the exhaust steam is transferred to the demineralized water in the demineralized water heat exchange pipes 3-12 to heat the demineralized water, the S-shaped channel divided by the partition plate 3-10 sets a flow path for the exhaust steam, so that the exhaust steam can be heat-exchanged with the condensate and the demineralized water in a large area, the latent heat of the exhaust steam can be maximally utilized in the multi-medium heat exchanger 3, meanwhile, the temperatures of the condensate and the demineralized water are effectively heated, the heat energy is efficiently utilized, the energy waste is reduced, the operation cost is lowered, and better conditions are provided for the subsequent process.

[0049] Further, the condensate heat exchange pipes 3-11 and the demineralized water heat exchange pipes 3-12 are each connected by multiple U-shaped pipes at equal intervals, so as to further increase the contact area of the exhaust steam with the heat exchange pipes and improve the heat exchange efficiency.

[0050] As a preferred scheme of the embodiment, the exhaust steam recovery pipeline 5 is provided with a No. 1 valve 20, the exhaust pipeline 6 is provided with a No. 2 valve 21, the exhaust steam venting pipeline 15 has two ends close to an inlet end of the No. 1 valve 20 and an outlet end of the No. 2 valve 21 respectively, the exhaust steam venting pipeline 15 is provided with a No. 3 valve 22, the condensate pipeline 7 is provided with a No. 4 valve 23, the condensate input pipeline 8 is provided with a No. 5 valve 24, the condensate bypass pipeline 13 has two ends close to an inlet end of the No. 4 valve 23 and an outlet end of the No. 5 valve 24 respectively, the condensate bypass pipeline 13 is provided with a No. 6 valve 25, the desalted water pipeline 9 is provided with a No. 7 valve 26, the desalted water input pipeline 10 is provided with a No. 8 valve 27, the desalted water bypass pipeline 14 has two ends close to an inlet end of the No. 7 valve 26 and an outlet end of the No. 8 valve 27 respectively, the desalted water bypass pipeline 14 is provided with a No. 9 valve 28, the exhaust steam reuse pipeline 11-2 between the booster pump 12 and the exhaust output pipeline 11-1 is provided with a No. 10 valve 29, the exhaust steam reuse pipeline 11-2 between the booster pump 12 and the exhaust inlet 2-1 is provided with a No. 11 valve 30 and a No. 12 valve 31, the No. 11 valve 30 is a check valve, which prevents the water from flowing back to the booster pump 12 due to the excessive pressure in the heat exchanger, thereby affecting the normal operation of the booster pump 12, and the No. 12 valve 31 is a cutoff valve, which is used to cut off the booster pump 12, thereby facilitating the maintenance of the booster pump 12, the exhaust steam reuse pipeline 11-3 is provided with a No. 13 valve 32, the exhaust steam sampling pipeline 17 is provided with a No. 14 valve 33, the drain pipeline 19 is provided with a No. 15 valve 34, and in actual operation, different valves are selected to be opened or closed according to different working conditions, different pipelines are connected, and the normal operation of the entire system is ensured.

[0051] In actual operation of the embodiment, the following is performed:

[0052] (1) When the multi-medium heat exchanger 3 is in normal operation, open the No. 1 valve 20, the No. 2 valve 21, the No. 4 valve 23, the No. 5 valve 24, the No. 7 valve 26, the No. 8 valve 27 and the No. 14 valve 33, close the No. 3 valve 22, the No. 6 valve 25, the No. 9 valve 28 and the No. 15 valve 34, the opening and closing of the No. 10 valve 29, the No. 11 valve 30, the No. 12 valve 31 and the No. 13 valve 32 and the start and stop of the booster pump 12 are determined according to the detection result of the sampling and detecting device 16, the exhaust steam of the thermal deaerator is discharged from the exhaust steam outlet 1-1, enters the multi-medium heat exchanger 3 through the exhaust steam recovery pipeline 5 and the No. 1 valve 20, the condensate water enters the condensate water heat exchange pipe 3-11 from the condensate water pipeline 7 and the No. 4 valve 23 through the second condensate water inlet 3-4, the desalted water in the chemical water treatment device 4 enters the desalted water heat exchange pipe 3-12 through the desalted water pipeline 9 and the No. 7 valve 26 through the second desalted water inlet 3-5, the exhaust steam is sequentially surface-exchanged with the condensate water and the desalted water from top to bottom through the S-shaped channel, the exhaust steam is condensed into the drain water by heat exchange and stored at the bottom of the multi-medium heat exchanger 3, the condensate water in the condensate water heat exchange pipe 3-11 is heated by exhaust steam heat exchange, enters the condensate water input pipeline 8 through the condensate water outlet 3-6, enters the deaerating tower head 1 through the first condensate water inlet 1-2 after passing through the No. 5 valve 24 to perform deaeration, the desalted water in the desalted water heat exchange pipe 3-12 is heated by exhaust steam heat exchange, enters the desalted water input pipeline 10 through the desalted water outlet 3-7, enters the deaerating tower head 1 through the first desalted water inlet 1-3 after passing through the No. 8 valve 27 to perform deaeration, the drain water at the bottom of the multi-medium heat exchanger 3 enters the sampling and detecting device 16 through the drain water sampling pipeline 17 through the No. 14 valve 33, if the detection meets the water quality requirement of the deaerating water tank 2, close the No. 13 valve 32, open the No. 10 valve 29, the No. 11 valve 30 and the No. 12 valve 31, start the booster pump 12, the drain water at the bottom of the multi-medium heat exchanger 3 enters the drain water recycling pipeline 11-2 from the drain water output pipeline 11-1, is pressurized by the booster pump 12 and enters the deaerating water tank 2 through the drain water inlet 2-1 for recycling and reuse, if the detection result does not meet the water quality requirement of the deaerating water tank 2, open the No. 13 valve 32, close the No. 10 valve 29, the No. 11 valve 30 and the No. 12 valve 31, stop the booster pump 12, the drain water at the bottom of the multi-medium heat exchanger 3 enters the drain water reprocessing pipeline 11-3 from the drain water output pipeline 11-1 and finally enters the chemical water treatment device 4 for reprocessing, the drain water is recycled and reused in the system after being treated as desalted water, a small amount of non-condensed gas in the multi-medium heat exchanger 3 is discharged to the atmosphere through the gas discharge pipeline 6 through the No. 2 valve 21 from the gas outlet 3-2.

[0053] (ii) When the multi-medium heat exchanger 3 is shut down for maintenance, open the No. 3 valve 22, the No. 6 valve 25, the No. 9 valve 28 and the No. 15 valve 34, close the remaining valves and the booster pump 12, the exhaust steam of the heat recovery steam generator is discharged from the exhaust steam outlet 1-1 into the exhaust steam recovery pipeline 5, then enters the exhaust steam vent pipeline 15 through the No. 3 valve 22, and finally is discharged into the atmosphere through the exhaust steam vent pipeline 6. The condensate water sequentially passes through the condensate water pipeline 7, the condensate water bypass pipeline 13, the No. 6 valve 25 and the condensate water input pipeline 8, and finally enters the deaerating tower head 1 through the first condensate water inlet 1-2 for deaeration. The desalted water in the chemical water treatment device 4 sequentially passes through the desalted water pipeline 9, the desalted water bypass pipeline 14, the No. 9 valve 28 and the desalted water input pipeline 10, and finally enters the deaerating tower head 1 through the first desalted water inlet 1-3 for deaeration. The drain water at the bottom of the multi-medium heat exchanger 3 sequentially passes through the drain water output pipeline 11-1, the drain water pipeline 19 and the No. 15 valve 34, and enters the blowdown cooling tank 18.

Claims

1. A thermal deaerator exhaust steam recycling system, comprising a thermal deaerator, the thermal deaerator comprising a deaerator tower head (1) and a deaerator water tank (2) connected to each other, characterized in that, It also comprises a multi-medium heat exchanger (3) and a chemical water treatment device (4); The top of the deaerating tower head (1) is provided with a steam exhaust outlet (1-1), and the side wall of the deaerating tower head (1) is provided with a first condensate water inlet (1-2) and a first desalted water inlet (1-3); the deaerating water tank (2) is provided with a drain inlet (2-1); the top of the multi-medium heat exchanger (3) is provided with a steam exhaust inlet (3-1) and a gas outlet (3-2), the bottom of the multi-medium heat exchanger (3) is provided with a drain outlet (3-3), and the side wall of the multi-medium heat exchanger (3) is provided with a second condensate water inlet (3-4), a second desalted water inlet (3-5), a condensate water outlet (3-6) and a desalted water outlet (3-7); The steam exhaust outlet (1-1) and the steam exhaust inlet (3-1) are connected with a steam exhaust recovery pipeline (5), the gas outlet (3-2) is connected with a gas discharge pipeline (6), the second condensate water inlet (3-4) is connected with a condensate water pipeline (7), the condensate water outlet (3-6) and the first condensate water inlet (1-2) are connected with a condensate water input pipeline (8), the second desalted water inlet (3-5) and the chemical water treatment device (4) are connected with a desalted water pipeline (9), the desalted water outlet (3-7) and the first desalted water inlet (1-3) are connected with a desalted water input pipeline (10), and the drain outlet (3-3) and the drain inlet (2-1) are connected with a drain pipeline (11), and a booster pump (12) is installed on the drain pipeline (11); The condensate water pipeline (7) and the condensate water input pipeline (8) are connected with a condensate water bypass pipeline (13), and the desalted water pipeline (9) and the desalted water input pipeline (10) are connected with a desalted water bypass pipeline (14).

2. The heat recovery system for a thermal deaerator as claimed in claim 1, wherein, The steam exhaust recovery pipeline (5) and the gas discharge pipeline (6) are connected with a steam exhaust venting pipeline (15).

3. The heat recovery system for a deaerator exhaust steam according to claim 2, wherein The drain pipeline (11) comprises a drain output pipeline (11-1), a drain recycling pipeline (11-2) and a drain reprocessing pipeline (11-3), one end of the drain output pipeline (11-1), the drain recycling pipeline (11-2) and the drain reprocessing pipeline (11-3) is connected, the other end of the drain output pipeline (11-1) is connected with the drain outlet (3-3), the other end of the drain recycling pipeline (11-2) is connected with the drain inlet (2-1), and the drain reprocessing pipeline (11-3) is connected with the chemical water treatment device (4); The booster pump (12) is installed on the drain recycling pipeline (11-2).

4. The heat recovery system for a deaerator exhaust steam according to claim 3, wherein A drain sampling pipeline (17) is connected between the drain output pipeline (11-1) and a sampling and detecting device (16).

5. The heat recovery system for a deaerator exhaust steam according to claim 4, wherein A blowdown cooling pool (18) is connected between the drain output pipeline (11-1) and a water discharge pipeline (19).

6. The heat recovery system for a deaerator exhaust steam according to claim 5, wherein The multi-medium heat exchanger (3) comprises a condensate heat exchange tank body (3-8) and a demineralized water heat exchange tank body (3-9), the bottom of the condensate heat exchange tank body (3-8) is communicated with the top of the demineralized water heat exchange tank body (3-9), the interiors of the condensate heat exchange tank body (3-8) and the demineralized water heat exchange tank body (3-9) are all divided into S-shaped channels by a partition plate (3-10), the S-shaped channel of the condensate heat exchange tank body (3-8) is provided with condensate heat exchange pipes (3-11), and the S-shaped channel of the demineralized water heat exchange tank body (3-9) is provided with demineralized water heat exchange pipes (3-12). One end of the condensate heat exchange pipe (3-11) is communicated with the second condensate inlet (3-4), the other end of the condensate heat exchange pipe (3-11) is communicated with the condensate outlet (3-6), one end of the demineralized water heat exchange pipe (3-12) is communicated with the second demineralized water inlet (3-5), and the other end of the demineralized water heat exchange pipe (3-12) is communicated with the demineralized water outlet (3-7).

7. The heat recovery system for a deaerator exhaust steam according to claim 6, wherein The condensate heat exchange pipe (3-11) and the demineralized water heat exchange pipe (3-12) are both formed by a plurality of U-shaped pipes connected at equal intervals.

8. The heat recovery system for a deaerator exhaust steam according to claim 7, wherein The waste steam recovery pipeline (5) is provided with a first valve (20), the air release pipeline (6) is provided with a second valve (21), the two ends of the waste steam venting pipeline (15) are respectively close to the inlet end of the first valve (20) and the outlet end of the second valve (21), the waste steam venting pipeline (15) is provided with a third valve (22), the condensate pipeline (7) is provided with a fourth valve (23), the condensate input pipeline (8) is provided with a fifth valve (24), the two ends of the condensate bypass pipeline (13) are respectively close to the inlet end of the fourth valve (23) and the outlet end of the fifth valve (24), the condensate bypass pipeline (13) is provided with a sixth valve (25), the demineralized water pipeline (9) is provided with a seventh valve (26), the demineralized water input pipeline (10) is provided with an eighth valve (27), the two ends of the demineralized water bypass pipeline (14) are respectively close to the inlet end of the seventh valve (26) and the outlet end of the eighth valve (27), the demineralized water bypass pipeline (14) is provided with a ninth valve (28), the steam reuse pipeline (11-2) between the booster pump (12) and the steam output pipeline (11-1) is provided with a tenth valve (29), the steam reuse pipeline (11-2) between the booster pump (12) and the steam inlet (2-1) is provided with an eleventh valve (30) and a twelfth valve (31), the steam reprocessing pipeline (11-3) is provided with a thirteenth valve (32), the steam sampling pipeline (17) is provided with a fourteenth valve (33), and the water release pipeline (19) is provided with a fifteenth valve (34).

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