CN219867852U - Deaerator exhaust steam waste heat recovery system - Google Patents
Deaerator exhaust steam waste heat recovery system Download PDFInfo
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- CN219867852U CN219867852U CN202321343380.XU CN202321343380U CN219867852U CN 219867852 U CN219867852 U CN 219867852U CN 202321343380 U CN202321343380 U CN 202321343380U CN 219867852 U CN219867852 U CN 219867852U
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- deaerator
- steam
- boiler
- pipeline
- pressure reducing
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- 238000011084 recovery Methods 0.000 title claims abstract description 27
- 239000002918 waste heat Substances 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 64
- 239000002699 waste material Substances 0.000 claims abstract description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000003546 flue gas Substances 0.000 claims abstract description 8
- 230000001105 regulatory effect Effects 0.000 claims description 41
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000010865 sewage Substances 0.000 claims description 5
- 230000008020 evaporation Effects 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 claims description 3
- 238000004064 recycling Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 235000019504 cigarettes Nutrition 0.000 description 3
- 238000006392 deoxygenation reaction Methods 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000005587 bubbling Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Abstract
The utility model relates to a deaerator exhaust steam waste heat recovery system which comprises a boiler, a deaerator and a heat exchanger. The boiler is used for providing deoxidized steam and comprises a deoxidized steam output end and a flue gas discharge pipeline; the flue gas discharge pipeline of the boiler is connected with a normal-temperature desalted water pipeline to generate return water of a secondary energy saver of the boiler; the deaerator is connected with a pipeline at the deaerated steam output end of the boiler, and is used for receiving deaerated steam generated by the boiler and deoxidizing; the heat source input end of the heat exchanger is connected with a waste steam exhaust end pipeline of the deaerator, and the cold source input end of the heat exchanger is connected with a water return pipeline of the boiler secondary energy saver; the heat exchanger can exchange heat between exhaust steam exhausted by the deaerator and return water of the boiler secondary energy-saving device, so that the aim of heat recovery is fulfilled. The utility model reasonably utilizes the backwater of the secondary energy-saving device of the boiler to exchange heat with the deoxidized exhaust steam without increasing the water quantity, and fully recovers the deoxidized exhaust steam waste heat so as to realize the recycling of heat.
Description
Technical Field
The utility model relates to the technical field of thermal energy engineering of power workshops of cigarette factories, in particular to a waste steam and waste heat recovery system of a deaerator.
Background
The boiler feed water mainly consists of condensed water and chemical make-up water, which contains a large amount of dissolved oxygen. If no relevant measures are taken, oxygen enters the boiler along with the water fed by the boiler, and oxygen corrosion is caused to the boiler, the steam pipeline and the heat exchange equipment, so that the service life of the thermodynamic equipment is shortened, the working reliability is reduced, and the safe and economic operation of the boiler is greatly influenced. Therefore, the timely removal of the dissolved oxygen of the boiler feed water is an important task for safe and economical operation of the boiler, and the most common method is thermal deoxygenation.
The principle of thermal deoxygenation is based on henry's law and dalton's law, when water and gas are in equilibrium, the amount of the gas dissolved in water is proportional to the partial pressure of the gas on the water surface, and the total pressure of the mixed gas is equal to the sum of the partial pressures of the gases. The deoxygenated steam is used to heat the water to 0.02Mpa to ensure that the water and the heated steam have enough contact area, and when the pressure of the water vapor acts on the liquid surface, oxygen and other gases are completely separated from the water, thereby achieving the purpose of deoxygenation.
At present, no exhaust steam recovery is designed in a power workshop of a cigarette factory, and the generated exhaust steam causes energy waste to outdoor emission, and simultaneously changes peripheral temperature and humidity, thereby affecting peripheral production environment and being unfavorable for production operation of the cigarette factory. Taking two low-pressure gas boilers of 25t/h as an example, two headless bubbling deaerators are configured, the treatment capacity of a single deaerator is 30t/h, the consumption of superheated steam of 1.0Mpa and 300 ℃ is 0.5t/h when the normal single boiler operates under the rated working condition, and the exhaust steam of 0.02Mpa under the same mass is discharged. The heat of the exhaust steam is 370kW, which is equivalent to the natural gas loss of 37Nm 3/h.
Disclosure of Invention
In order to solve the defects in the prior art, the utility model provides a deaerator exhaust steam waste heat recovery system which can recover the deaerator exhaust steam waste heat, and meanwhile, the balance of a thermodynamic system is not affected, so that energy conservation and emission reduction are realized.
The technical scheme for achieving the aim of the utility model is as follows:
a deaerator exhaust steam waste heat recovery system comprises a boiler, a deaerator and a heat exchanger.
The boiler is used for providing deoxidized steam and comprises a deoxidized steam output end and a flue gas discharge pipeline; the flue gas discharge pipeline of the boiler is connected with a normal-temperature desalted water pipeline to generate return water of a secondary energy saver of the boiler;
the deaerator is connected with a pipeline at the deaerated steam output end of the boiler, and is used for receiving deaerated steam generated by the boiler and deoxidizing;
the heat source input end of the heat exchanger is connected with a waste steam exhaust end pipeline of the deaerator, and the cold source input end of the heat exchanger is connected with a water return pipeline of the boiler secondary energy saver; the heat exchanger can exchange heat between exhaust steam exhausted by the deaerator and return water of the boiler secondary energy-saving device, so that the aim of heat recovery is fulfilled.
Further, the device also comprises a pressure reducing valve group and an electric regulating valve group; the pressure reducing valve group is arranged and installed between the deoxidizing steam output end of the boiler and the deoxidizing steam input end of the deoxidizer; the electric regulating valve group is arranged and installed between the pressure reducing valve group and the deoxidizing steam input end of the deoxidizer.
Further, the pressure reducing valve group comprises a stop valve and a pressure reducing valve which are arranged in parallel; a pressure sensor is arranged behind the pressure reducing valve; the electric regulating valve group comprises a stop valve and an electric regulating valve which are arranged in parallel; and a pressure sensor is arranged at the top of the deaerator.
Further, the pressure reducing valve is of a DN50 type; the pressure reducing valve is characterized in that an inlet pipeline of the pressure reducing valve is DN80, and the model of an outlet pipeline of the pressure reducing valve is DN100; the electric regulating valve is of a DN65 model, an inlet pipeline of the electric regulating valve is of a DN100 model, and an outlet pipeline of the electric regulating valve is of a DN100 model; the stop valve model is DN80.
Further, the deaerator condensate water discharge port is connected with a sewage pipe network; the top of the heat exchanger is provided with a flash evaporation exhaust steam outlet which is connected with an exhaust steam outlet end pipeline of the deaerator.
Further, return water of the secondary energy saver of the boiler after heat exchange and temperature rise of the heat exchanger is output from the heat exchanger, sequentially passes through the temperature sensor and the electric regulating valve group, and is connected into the deaerator for the deaerator.
Further, a split cylinder is arranged between the deoxidized steam output end of the boiler and the pressure reducing valve group, and redundant deoxidized steam can be split for production.
Further, two deaerators are arranged and are used in parallel.
Further, the upper parts of the two deaerators are provided with steam balance pipes, and the lower parts of the two deaerators are provided with water balance pipes.
The principle of the utility model is as follows:
the deoxidized steam generated by the boiler 1 is separated by the separating cylinder 6 and is firstly reduced in pressure by the pressure reducing valve group 4, and the pressure sensor 7 is arranged behind the pressure reducing valve for detecting whether the pressure is stable or not behind the pressure reducing valve. The steam after decompression enters the deaerator 2 to heat the deaerator 2 to store water after the steam consumption is regulated by the electric regulating valve group 5, and the opening of the electric regulating valve is controlled by the pressure sensor 7 at the top of the deaerator 2, so that the internal pressure of the deaerator 2 is ensured to be constant.
The waste steam formed after the deaeration steam heats the water stored in the deaerator 2 enters from the bottom of the heat exchanger 3, the waste steam goes away from the shell side of the heat exchanger 3, condensed water is formed after baffling heat exchange, and the condensed water is discharged to a sewage pipe network from the bottom of the other side of the heat exchanger 3. When the heat exchange is insufficient, the trace flash exhaust steam is discharged from the top of the heat exchanger 3. The cold source of the heat exchanger 3 adopts the return water of the boiler secondary energy-saving device. The return water of the secondary energy-saving device of the boiler enters the heat exchanger 3 from the bottom, the return water of the secondary energy-saving device of the boiler passes through the tube side of the heat exchanger 3, is heated by deoxidizing exhaust steam and then enters the deaerator 2 from the top of the same side, the temperature of the return water of the energy-saving device can reach 85 ℃ after the return water of the energy-saving device is fully heat-exchanged with the exhaust steam, the recovery heat quantity is up to 348kW, and the recovery rate is up to 94%.
The upper parts of the two deaerators 2 connected in parallel are provided with steam balance pipes, and the lower parts of the two deaerators 2 are provided with water balance pipes, so that the two deaerators 2 are connected in parallel for use when the boiler 1 is under heavy load, and the internal pressure and the water level of the deaerators are consistent.
And a DN50 self-standing pressure reducing valve is selected according to the calculation of the deoxidized steam consumption of the system, in order to ensure that the steam flow after the pressure reducing valve meets the use requirement and reduce the pressure loss of a pipeline, an outlet pipeline is adjusted to DN100 through a big end and a small end after the pressure reducing valve, a DN80 stop valve is arranged by a pressure reducing valve group 4 in a bypass way, the front stop valve and the rear stop valve of the pressure reducing valve are closed when the pressure reducing valve fails, and the bypass stop valve is manually opened to adjust the steam flow and the pressure so as to supply emergency use. The electric regulating valve is determined to be DN65 according to the system requirement and the valve flow coefficient, in order to ensure that the steam flow after the electric regulating valve meets the use requirement and reduce the pipeline pressure loss, an outlet pipeline is adjusted to be DN100 through a big end, the electric regulating valve is provided with DN80 stop valves in a bypass way, the front stop valve and the rear stop valve of the electric regulating valve are closed when the electric regulating valve fails, and the bypass stop valve is manually opened to regulate the steam flow so as to supply emergency use.
Compared with the prior art, the utility model has the following advantages:
the utility model reasonably utilizes the backwater of the secondary energy-saving device of the boiler to exchange heat with the deoxidized exhaust steam under the condition of not increasing the water quantity, and fully recovers the deoxidized exhaust steam waste heat originally discharged by the air under the premise of ensuring the water quantity balance of the system so as to realize the recycling of heat. The temperature of the energy-saving device backwater can reach 85 ℃ after the backwater is fully exchanged with the exhaust steam, the heat recovery quantity is up to 348kW, and the recovery rate is up to 94%.
Drawings
FIG. 1 is a diagram of a system pipeline connection mode according to an embodiment of the utility model;
in the figure:
1-boiler, 2-deaerator, 3-heat exchanger, 4-pressure reducing valve group, 5-electric regulating valve group, 6-cylinder,
7-pressure sensor, 8-temperature sensor.
Detailed Description
As shown in fig. 1, an embodiment of the present utility model is as follows:
a waste steam waste heat recovery system of deaerators 2 comprises a boiler 1, a heat exchanger 3 and two deaerators 2. Two deaerators 2 are used in parallel. The upper parts of the two deaerators 2 are provided with steam balance pipes, and the lower parts thereof are provided with water balance pipes.
The boiler 1 is used for generating deoxidized steam and comprises a deoxidized steam output end and a flue gas discharge pipeline; the deoxidizing steam output end of the boiler 1 is also provided with a split cylinder 6, which comprises a deoxidizing steam output end and a steam output end for production, and can split redundant deoxidizing steam into steam for production. The flue gas exhaust pipeline of the boiler 1 is connected with a normal temperature desalted water pipeline to generate the return water of the boiler secondary energy-saving device.
A pressure reducing valve group 4 and an electric regulating valve group 5 are sequentially arranged between the deoxidizing steam output end of the sub-cylinder 6 and the deoxidizing steam input end of the deoxidizer 2. The pressure reducing valve group 4 consists of a stop valve, a pressure reducing valve and a big head and a small head, and a pressure sensor 7 is arranged behind the pressure reducing valve and used for detecting whether the pressure behind the pressure reducing valve is stable or not. The electric regulating valve group 5 consists of a stop valve, a big end, a small end and an electric regulating valve group 5, wherein the opening of the electric regulating valve is controlled by a pressure sensor 7 at the top of the deaerator 2, so that the internal pressure of the deaerator 2 is ensured to be constant at 0.02Mpa. The deoxidized steam is reduced in pressure to 0.4Mpa by the pressure reducing valve group 4. And a DN50 self-standing pressure reducing valve is selected according to the calculation of the deoxidized steam consumption of the system, in order to ensure that the steam flow after the pressure reducing valve meets the use requirement and reduce the pressure loss of a pipeline, an outlet pipeline is adjusted to DN100 through a big end and a small end after the pressure reducing valve, a DN80 stop valve is arranged by a pressure reducing valve group 4 in a bypass way, the front stop valve and the rear stop valve of the pressure reducing valve are closed when the pressure reducing valve fails, and the bypass stop valve is manually opened to adjust the steam flow and the pressure so as to supply emergency use. The electric valve adjusts the opening of the valve in real time according to the pressure feedback in the deaerator 2 so as to ensure constant pressure and constant temperature in the deaerator 2, and realize the stability and reliability of the deaeration process. The electric regulating valve group 5 is composed of an electric regulating valve, a stop valve and a big head and a small head, the electric regulating valve is determined to be DN65 according to system requirements and valve flow coefficients, in order to ensure that the steam flow after the electric regulating valve meets the use requirements and reduce pipeline pressure loss, an outlet pipeline is adjusted to be DN100 through the big head and the small head, the stop valve with the same specification is not used for saving cost, the electric regulating valve is provided with the DN80 stop valve in a bypass way, the front stop valve and the rear stop valve of the electric regulating valve are closed when the electric regulating valve fails, and the bypass stop valve is manually opened to regulate the steam flow so as to supply emergency use.
The deaerator 2 is connected with an output end pipeline of the electric regulating valve, and is used for receiving deaerated steam generated by the boiler 1 and deoxidizing. The condensed water outlet of the deaerator 2 is connected with a sewage pipe network; the top of the heat exchanger 3 is provided with a flash evaporation exhaust steam outlet which is connected with an exhaust steam outlet end pipeline of the deaerator 2.
The heat source input end of the heat exchanger 3 is connected with a exhaust steam discharge end pipeline of the deaerator 2, and the cold source input end of the heat exchanger is connected with a water return pipeline of the boiler secondary energy-saving device; the exhaust steam discharged by the deaerator 2 and the backwater of the boiler secondary energy-saving device can be subjected to heat exchange through the heat exchanger 3, so that the aim of heat recovery is fulfilled. The return water temperature of the secondary energy economizer of the boiler is controlled by the program of the boiler 1, the outlet water temperature is set to 60 ℃, and the water quantity is 12t/h during rated load combustion of the boiler 1. The return water of the boiler secondary energy-saving device enters the heat exchanger 3 from the bottom, the return water of the energy-saving device runs through the tube side of the heat exchanger 3, and after being heated by deoxidized exhaust steam, the return water sequentially passes through the temperature sensor 8 and the electric regulating valve group 5 and then enters the deaerator 2 for the deaerator 2 to use.
When in use, the steam generated by the boiler 1 passes through the air separating cylinder 6 to separate deoxidized steam, the pressure of the steam with the pressure of 1.0Mpa is reduced to steam with the pressure of 0.4Mpa through the pressure reducing valve group 4, and the pressure sensor 7 is arranged behind the pressure reducing valve to detect whether the pressure is stable behind the pressure reducing valve. The decompressed steam enters the deaerator 2 to heat the deaerator 2 to store water after the steam consumption is regulated by the electric regulating valve group 5, the opening of the electric regulating valve is controlled by the pressure sensor 7 at the top of the deaerator 2, and the constant pressure in the deaerator 2 is ensured to be 0.02Mpa.
The waste steam formed after the deaeration steam heats the water stored in the deaerator 2 enters from the bottom of the heat exchanger 3, the waste steam goes away from the shell side of the heat exchanger 3, condensed water is formed after baffling heat exchange, and the condensed water is discharged to a sewage pipe network from the bottom of the other side of the heat exchanger 3. When the heat exchange is insufficient, the trace flash exhaust steam is discharged from the top of the heat exchanger 3. The cold source of the heat exchanger 3 adopts the return water of the boiler secondary energy-saving device. The return water temperature of the secondary energy economizer of the boiler is set to be 60 ℃, and the water quantity is 12t/h when the boiler 1 burns under rated load. The return water of the secondary energy-saving device of the boiler enters the heat exchanger 3 from the bottom, the return water of the secondary energy-saving device of the boiler passes through the tube side of the heat exchanger 3, is heated by deoxidizing exhaust steam and then enters the deaerator 2 from the top of the same side, the temperature of the return water of the energy-saving device can reach 85 ℃ after the return water of the energy-saving device is fully heat-exchanged with the exhaust steam, the recovery heat quantity is up to 348kW, and the recovery rate is up to 94%.
It is to be understood that the above-described embodiments of the present utility model are merely illustrative of or explanation of the principles of the present utility model and are in no way limiting of the utility model. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present utility model should be included in the scope of the present utility model. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.
Claims (9)
1. The utility model provides a deaerator (2) exhaust steam waste heat recovery system which characterized in that includes:
a boiler (1) for providing deoxidized steam, comprising a deoxidized steam output end and a flue gas discharge pipeline; the flue gas exhaust pipeline of the boiler (1) is connected with a normal-temperature desalted water pipeline to generate secondary energy-saving device backwater of the boiler (1);
the deaerator (2) is connected with the deaerated steam output end of the boiler (1) through a pipeline, and is used for receiving deaerated steam generated by the boiler (1) and deoxidizing;
the heat exchanger (3) is characterized in that the heat source input end of the heat exchanger is connected with a waste steam exhaust end pipeline of the deaerator (2), and the cold source input end of the heat exchanger is connected with a water return pipeline of the secondary energy-saving device of the boiler (1); the exhaust steam exhausted by the deaerator (2) and the backwater of the secondary energy-saving device of the boiler (1) can be subjected to heat exchange through the heat exchanger (3), so that the aim of heat recovery is fulfilled.
2. The deaerator (2) exhaust steam waste heat recovery system as claimed in claim 1, wherein: the device also comprises a pressure reducing valve group (4) and an electric regulating valve group (5); the pressure reducing valve group (4) is arranged between the deoxidizing steam output end of the boiler (1) and the deoxidizing steam input end of the deoxidizer (2); the electric regulating valve group (5) is arranged and installed between the pressure reducing valve group (4) and the deoxidizing steam input end of the deoxidizer (2).
3. A deaerator (2) exhaust steam waste heat recovery system as claimed in claim 2, characterized in that: the pressure reducing valve group (4) comprises a stop valve and a pressure reducing valve which are arranged in parallel; a pressure sensor (7) is arranged behind the pressure reducing valve; the electric regulating valve group (5) comprises a stop valve and an electric regulating valve which are arranged in parallel; the top of the deaerator (2) is provided with a pressure sensor (7).
4. A deaerator (2) exhaust steam waste heat recovery system as claimed in claim 3, characterized in that: the pressure reducing valve is DN50; the pressure reducing valve is characterized in that an inlet pipeline of the pressure reducing valve is DN80, and the model of an outlet pipeline of the pressure reducing valve is DN100; the electric regulating valve is of a DN65 model, an inlet pipeline of the electric regulating valve is of a DN100 model, and an outlet pipeline of the electric regulating valve is of a DN100 model; the stop valve model is DN80.
5. The deaerator (2) exhaust steam waste heat recovery system as claimed in claim 1, wherein: the condensed water discharge port of the deaerator (2) is connected with a sewage pipe network; the top of the heat exchanger (3) is provided with a flash evaporation exhaust steam outlet which is connected with the exhaust steam outlet end of the deaerator (2) through a pipeline.
6. The deaerator (2) exhaust steam waste heat recovery system as claimed in claim 1, wherein: the return water of the secondary energy-saving device of the boiler (1) after heat exchange and temperature rise of the heat exchanger (3) is output from the heat exchanger (3), sequentially passes through the temperature sensor (8) and the electric regulating valve group (5), and is connected into the deaerator (2) for the deaerator (2).
7. A deaerator (2) exhaust steam waste heat recovery system as claimed in claim 2 or 3, characterized in that: a split cylinder (6) is arranged between the deoxidizing steam output end of the boiler (1) and the pressure reducing valve group (4), and can split redundant deoxidizing steam for production.
8. The deaerator (2) exhaust steam waste heat recovery system as claimed in claim 1, wherein: two deaerators (2) are arranged, and the two deaerators (2) are used in parallel.
9. The deaerator (2) exhaust steam waste heat recovery system as claimed in claim 8, wherein: the upper parts of the two deaerators (2) are provided with steam balance pipes, and the lower parts of the two deaerators are provided with water balance pipes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321343380.XU CN219867852U (en) | 2023-05-30 | 2023-05-30 | Deaerator exhaust steam waste heat recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321343380.XU CN219867852U (en) | 2023-05-30 | 2023-05-30 | Deaerator exhaust steam waste heat recovery system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219867852U true CN219867852U (en) | 2023-10-20 |
Family
ID=88324577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321343380.XU Active CN219867852U (en) | 2023-05-30 | 2023-05-30 | Deaerator exhaust steam waste heat recovery system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219867852U (en) |
-
2023
- 2023-05-30 CN CN202321343380.XU patent/CN219867852U/en active Active
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