CN212005640U - Water supply deoxidization system - Google Patents
Water supply deoxidization system Download PDFInfo
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- CN212005640U CN212005640U CN202020045362.3U CN202020045362U CN212005640U CN 212005640 U CN212005640 U CN 212005640U CN 202020045362 U CN202020045362 U CN 202020045362U CN 212005640 U CN212005640 U CN 212005640U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 213
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000001301 oxygen Substances 0.000 claims abstract description 9
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 9
- 230000009471 action Effects 0.000 claims abstract description 4
- 238000006392 deoxygenation reaction Methods 0.000 claims description 13
- 230000002209 hydrophobic effect Effects 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 3
- 239000010865 sewage Substances 0.000 abstract description 8
- 239000002918 waste heat Substances 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 4
- 239000013589 supplement Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000003211 malignant effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The embodiment of the utility model provides a feedwater deoxidization system, condensate water gets into the oxygen-eliminating device through the female pipe of condensate water. The demineralized water enters the deaerator through the demineralized water main pipe and is used for adjusting the water level of the deaerator. And the drained water is input into a deaerator through a drain main pipe to be used as water supplement. The heating steam enters the deaerator through the heating steam main pipe. The water in the deaerator removes oxygen in the water under the action of heating steam to become deaerated water. The deaerated water is output to the electric water feeding pump through the low-pressure water feeding main pipe, the electric water feeding pump outputs the deaerated water in a pressurizing mode to be high-pressure deaerated water, and then the high-pressure water feeding main pipe conveys the high-pressure deaerated water to external water using equipment. In order to prevent the cavitation of the electric water-feeding pump, a water-feeding recirculation main pipe is also arranged at the outlet of the electric water-feeding pump and guides water back to the deaerator. This embodiment still adopts the mode of two oxygen-eliminating devices side by side operation, increases water treatment's speed, promotes the deoxidization effect. Meanwhile, waste heat and sewage are recycled and drained, and heat emission pollution is reduced.
Description
Technical Field
The utility model relates to a boiler technical field especially relates to a boiler feed water deoxidization system.
Background
Oxygen corrosion is the most common and more severe corrosion in boiler systems. Since the boiler feed water inevitably comes into contact with air, oxygen dissolved in the boiler feed water is substantially saturated, and therefore, the pipes and equipment through which the feed water flows are corroded by the oxygen contained in the feed water. Pits appear on the inner wall of the corroded pipeline, so that the water flow resistance can be increased, and pipeline explosion accidents can occur in severe cases. In addition, in heat exchange equipment, gases present in the feedwater also impede heat transfer, reducing the heat transfer effectiveness, so boiler feedwater must be deoxygenated.
Meanwhile, a large amount of waste heat sewage and hydrophobic water exist in the operation of a power plant, if the waste heat sewage and the hydrophobic water cannot be effectively treated, the direct discharge causes heat pollution to the environment, and therefore the waste heat sewage and the hydrophobic water need to be treated.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a feedwater deoxidization system improves the temperature of oxygen-eliminating device normal water through heating steam, makes the gas that dissolves in the aquatic escape, and when the boiling of water under being heated to corresponding pressure, water no longer has the ability of dissolving gas, reaches the purpose of deoxidization. Simultaneously, the mode that the double deaerators operate in parallel is adopted to increase the water treatment speed, improve the deaerating effect, and improve the heat utilization rate and reduce the pollution of heat emission to the environment through recycling waste heat sewage and drainage.
In order to achieve the above object, the utility model provides a feedwater deoxidization system includes:
a condensed water main pipe for introducing condensed water introduced from the outside;
the deaerator is communicated with the condensed water main pipe and receives the condensed water in the condensed water main pipe;
the desalted water main pipe is communicated with the deaerator, introduces external desalted water into the deaerator, and adjusts the water level of the deaerator;
the low-pressure drainage main pipe of the air preheater is communicated with the deaerator and guides external low-pressure drainage to the deaerator;
the heating steam main pipe is communicated with the deaerator and used for conveying external heating steam to the deaerator, and the deaerator outputs deaerated water under the action of the heating steam;
the low-pressure water supply main pipe is communicated with the deaerator, receives the deaerated water output by the deaerator and outputs low-pressure deaerated water;
the electric water feeding pump is communicated with the low-pressure water feeding main pipe and used for pressurizing the low-pressure deoxygenated water output by the low-pressure water feeding main pipe to output the low-pressure deoxygenated water into high-pressure deoxygenated water;
the high-pressure water supply main pipe is communicated with the electric water supply pump and is used for conveying the high-pressure deoxygenated water output by the electric water supply pump to external water utilization equipment;
one end of the water feeding recirculation main pipe is communicated with the water outlet of the electric water feeding pump, and the other end of the water feeding recirculation main pipe is communicated with the deaerator;
the emergency water discharging main pipe is communicated with the deaerator;
and the drainage flash tank is communicated with the deaerator through the emergency water drainage main pipe.
Preferably, the feedwater deoxygenation system further comprises: and the standby deaerator is communicated with the deaerator through a steam balance pipe.
Preferably, the water supply deoxygenation system further comprises a continuous sewage discharge flash tank and an air preheater drainage flash tank;
a steam outlet of the continuous blowdown flash tank and a steam outlet of the drain flash tank of the air preheater are respectively communicated with the steam balance pipe;
and a drain port of the air preheater drain flash tank is communicated with the drain flash tank.
Preferably, the feedwater deoxygenation system further comprises: and the drain tank water inlet main pipe is communicated with the deaerator and conducts outside water drainage to the deaerator.
Preferably, a drain port of the drain flash tank is communicated with the air preheater low-pressure drain main pipe, and drain is led into the air preheater low-pressure drain main pipe.
Preferably, the electric feed water pump includes: three working water pumps and one standby water pump.
The utility model provides a feedwater deoxidization system improves the temperature of oxygen-eliminating device normal water through heating steam, makes the gas that dissolves in the aquatic escape, and when the boiling of water under being heated to corresponding pressure, water no longer has the ability of dissolving gas, reaches the purpose of deoxidization. Simultaneously, the mode that the double deaerators operate in parallel is adopted to increase the water treatment speed, improve the deaerating effect, and improve the heat utilization rate and reduce the pollution of heat emission to the environment through recycling waste heat sewage and drainage.
Drawings
Fig. 1 is a system diagram of a feedwater deoxygenation system provided by an embodiment of the present invention.
Detailed Description
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Fig. 1 is a water supply deoxygenation system provided by an embodiment of the present invention, as shown in the figure, the water supply deoxygenation system includes: the system comprises a condensed water main pipe 11, a heating steam main pipe 12, a demineralized water main pipe 13, an air preheater low-pressure drain main pipe 14, a drain tank incoming water main pipe 15, a deaerator 31, a standby deaerator 32, a low-pressure water supply main pipe 21, a water supply recirculation main pipe 22, a high-pressure water supply main pipe 23, an emergency water discharge main pipe 24, a continuous pollution discharge flash tank 41, an air preheater drain flash tank 42, a drain flash tank 43, an electric water supply pump 5 and a steam balance pipe 6.
The condensed water header pipe 11 introduces condensed water introduced from the outside as water supply to the deaerator 31.
And the demineralized water main pipe 13 is communicated with the deaerator 31, guides external demineralized water into the deaerator 31, and adjusts the water level of the deaerator 31.
In the embodiment, 2 medium-pressure rotary-film deaerators are arranged, and the volume of a water tank of each deaerator is 40m3The working pressure is 0.17MPa, the water outlet temperature is 130 ℃, and the output of the deaerator is 110 t/h. This embodiment requires when the oxygen-eliminating device moves, and the condensate water gets into the oxygen-eliminating device and will stabilize, can not rise greatly, requires that the operation personnel come to carry out the fine adjustment and the duty to the oxygen-eliminating device water level through control demineralized water flow, and the adjustment will be timely, will have the promptness. At low boiler loads, the deaerator is at a slightly higher water level prior to the process of suppressing the fireLower, so that there is a margin for adjustment when the pressure is high.
Meanwhile, a large amount of hydrophobic water is generated in the operation process of the power plant, and if the hydrophobic water is not fully utilized, heat waste is caused. For the energy saving, reduce soda loss, this embodiment has still connected the hydrophobic female pipe of air preheater low pressure 14 and the drain trap of the female pipe of steam trap coming 15 on oxygen-eliminating device 31, and the hydrophobic of leading-in production in-process production is as the moisturizing of oxygen-eliminating device 31, reduces hot water loss, has improved heat recovery and has utilized the efficiency.
The heating steam main pipe 12 is communicated with the deaerator 31, external heating steam is conveyed to the deaerator 31, and deaerator 31 outputs deaerated water under the action of the heating steam.
In this embodiment, the heating steam of the deaerator 31 mainly comes from a two-stage non-regulated steam extraction main pipe of a steam turbine in a plant.
Starting the deaerator 31: the deaerator 31 is preferably started in a cold state by firstly feeding steam and then feeding water, the shell is preheated for 15-20 minutes by using an adjacent machine to heat the steam or externally connected auxiliary steam, a water supplementing valve is opened under a certain steam pressure, water is fed into a deaerating head of the deaerator 31, and a reboiling steam inlet valve of the large deaerator 31 is gradually opened to heat feed water. With the rise of the unit load, the heating steam of the deaerator 31 is switched to the local extraction steam.
The cold start of the deaerator 31 can also adopt a method of simultaneously feeding steam, feeding water or feeding water first and then feeding steam, but the opening degree of a steam inlet valve is controlled to avoid generating overlarge temperature difference stress between the upper wall and the lower wall of the water tank of the deaerator 31. When the water temperature of the deaerator 31 is close to 130 ℃, the reboiling steam inlet valve of the deaerator 31 is closed.
The low-pressure water supply main pipe 21 is communicated with the deaerator 31, receives the deaerated water output by the deaerator 31 and outputs the deaerated water as low-pressure deaerated water; the electric water feed pump 5 is communicated with the low-pressure water feed main pipe 21 and used for pressurizing the low-pressure deoxygenated water output by the low-pressure water feed main pipe 21 and outputting the low-pressure deoxygenated water into high-pressure deoxygenated water; and the high-pressure water supply main pipe 23 is communicated with the electric water supply pump 5 and is used for conveying the high-pressure deoxygenated water output by the electric water supply pump 5 to external water utilization equipment.
In this embodiment, the low pressure water supply main pipe 21 at the oxygen-removed water outlet of the oxygen remover 31 adopts a single main pipe system, and 4 water supply pumps are designed for the 5 systems of the electric water supply pump connected by the low pressure water supply main pipe 21, wherein 3 are working water pumps, and 1 is a standby water pump. The inlet of the feed pump is provided with an inlet filter screen, the outlet of the feed pump is respectively provided with an automatic recirculation regulating valve with a non-return function, and the recirculation system comprises a manual stop valve and a recirculation pipeline stop valve. When the feed water pump is started, the starting current and the returning time are noticed; checking whether the motor and the water feed pump have abnormal vibration and noise; checking the sealing condition of all the joints; checking the differential pressure of a filter screen at the inlet of the feed pump, and if the differential pressure is large, cleaning the filter screen; checking that the temperature of each bearing is not abnormal and is less than 65 ℃; the high-pressure water supply main pipe 23 at the outlet of the water supply pump also adopts a main pipe system, and the standby water pump is automatically put into use when the pressure of the high-pressure water supply main pipe 23 is low.
One end of the water supply recirculation main pipe 22 is communicated with the water outlet of the electric water supply pump 5, and the other end is communicated with the deaerator 31. The water supply amount of the water supply pump is changed along with the load of the boiler, and in the starting process of the deaerator 31 or when the load is very low, the water supply pump is likely to operate under the condition that the water supply amount is very small or almost zero, water is heated in the pump body by the friction of the impeller, so that the water temperature is increased, and after the water temperature is increased to a certain degree, vaporization can occur to form cavitation. In order to prevent cavitation, when the water supply quantity of the water pump is lower than a certain degree, the water supply recirculation main pipe 22 is opened, and part of water is returned to the water tank of the deaerator 31, so that a certain water quantity can pass through the water pump, and the safe operation of the water supply pump is ensured.
The emergency water discharging main pipe 24 is communicated with the deaerator 31; and the water drainage flash tank 43 is communicated with the deaerator 31 through the emergency water drainage main pipe 24. The oxygen-eliminating device 31 water level is too high and can cause the oxygen-eliminating device 31 overpressure, cause the malignant accident, consequently be equipped with urgent water outlet in the oxygen-eliminating device 31, put water to drainage flash tank 43 through the main pipe 24 that promptly drains, avoid the occurence of failure.
In this embodiment, 2 deaerators are provided, and the deaerators can be operated in parallel and simultaneously. Wherein, the connection mode of the standby deaerator 32, the condensed water main pipe 11, the heating steam main pipe 12, the demineralized water main pipe 13, the air preheater low-pressure drain main pipe 14, the drain tank incoming water main pipe 15, the low-pressure water supply main pipe 21, the water supply recirculation main pipe 22 and the emergency drain main pipe 24 is the same as that of the deaerator 31. The standby deaerator 32 is communicated with the deaerator 31 through the steam balance pipe 6, and is used for balancing the pressure of the two deaerators and facilitating the parallel operation of the two deaerators.
When two deaerators need to operate in parallel, the standby deaerator 32 is started in the same way as the deaerator 31, and after the standby deaerator is started normally, the standby deaerator is operated in parallel. The conditions required for the parallel run were as follows:
1) the water level difference of the water tanks of the two deaerators is less than 100 mm;
2) the pressure difference of the two deaerators is less than 2 KPa;
3) the difference of the water supply temperatures of the two deaerators is not more than 10 ℃.
When the parallel operation condition is reached, the steam balance valve of the standby deaerator 32 is opened first, the pressure of the standby deaerator 32 is gradually increased to be close to the pressure of the deaerator 31, and then the water balance valve of the standby deaerator 32 is opened until the water level of the standby deaerator 32 is consistent with the water level of the deaerator 31. When the water temperature of the standby deaerator 32 is close to 130 ℃, the reboiling steam inlet valve of the standby deaerator 32 is closed. At this time, the two deaerators are operated in parallel.
The water supply deoxygenation system provided by the embodiment further comprises a continuous blowdown flash tank 41 and an air preheater drainage flash tank 42; the steam outlet of the continuous blowdown flash tank 41 and the steam outlet of the drain flash tank 42 of the air preheater are respectively communicated with a steam balance pipe 6; the drain port of the drain flash tank 42 of the air preheater is communicated with the drain flash tank 43; the drain port of the drain flash tank 43 is communicated with the air preheater low-pressure drain main pipe 14, and drain is led into the air preheater low-pressure drain main pipe 14.
The secondary steam generated in the continuous blowdown flash tank 41 and the air preheater drainage flash tank 42 is led out through corresponding pipelines and is connected to the steam balance pipe 6, so that the secondary steam is reused. At the same time, the hydrophobic can also be fed to the oxygen removal system. The method can recover heat lost by continuous blowdown and drainage of the boiler, improve the efficiency of the boiler and reduce heat emission.
The embodiment of the utility model provides a feedwater deoxidization system removes oxygen and other noncondensable gases in the feedwater through the mode of heating steam, avoids the oxygen in the feedwater to cause the damage to boiler equipment. The feedwater deoxidization system that this embodiment provided adopts the mode of two oxygen-eliminating devices side by side operation, has increased water treatment's speed, has promoted the deoxidization effect. Simultaneously, this embodiment has still increased the heat recovery who utilizes waste heat sewage and hydrophobic, has both improved boiler thermal efficiency, again greatly reduced the harm of heat emission to the environment.
Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied in hardware, a software module executed by a processor, or a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A water supply deoxygenation system characterized in that said water supply deoxygenation system comprises:
a condensed water main pipe for introducing condensed water introduced from the outside;
the deaerator is communicated with the condensed water main pipe and receives the condensed water in the condensed water main pipe;
the desalted water main pipe is communicated with the deaerator, introduces external desalted water into the deaerator, and adjusts the water level of the deaerator;
the low-pressure drainage main pipe of the air preheater is communicated with the deaerator and guides external low-pressure drainage to the deaerator;
the heating steam main pipe is communicated with the deaerator and used for conveying external heating steam to the deaerator, and the deaerator outputs deaerated water under the action of the heating steam;
the low-pressure water supply main pipe is communicated with the deaerator, receives the deaerated water output by the deaerator and outputs low-pressure deaerated water;
the electric water feeding pump is communicated with the low-pressure water feeding main pipe and used for pressurizing the low-pressure deoxygenated water output by the low-pressure water feeding main pipe to output the low-pressure deoxygenated water into high-pressure deoxygenated water;
the high-pressure water supply main pipe is communicated with the electric water supply pump and is used for conveying the high-pressure deoxygenated water output by the electric water supply pump to external water utilization equipment;
one end of the water feeding recirculation main pipe is communicated with the water outlet of the electric water feeding pump, and the other end of the water feeding recirculation main pipe is communicated with the deaerator;
the emergency water discharging main pipe is communicated with the deaerator;
and the drainage flash tank is communicated with the deaerator through the emergency water drainage main pipe.
2. The feedwater deoxygenation system of claim 1, further comprising: and the standby deaerator is communicated with the deaerator through a steam balance pipe.
3. The water supply deoxygenation system of claim 2 further comprising a continuous blowdown flash tank, an air preheater hydrophobic flash tank;
a steam outlet of the continuous blowdown flash tank and a steam outlet of the drain flash tank of the air preheater are respectively communicated with the steam balance pipe;
and a drain port of the air preheater drain flash tank is communicated with the drain flash tank.
4. The feedwater deoxygenation system of claim 1, further comprising: and the drain tank water inlet main pipe is communicated with the deaerator and conducts outside water drainage to the deaerator.
5. The water supply oxygen removal system according to claim 1, wherein a drain port of the drain flash tank is communicated with the air preheater low-pressure drain main pipe, and drain water is introduced into the air preheater low-pressure drain main pipe.
6. The feedwater deoxygenation system of claim 1, wherein the electric feedwater pump comprises: three working water pumps and one standby water pump.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020045362.3U CN212005640U (en) | 2020-01-09 | 2020-01-09 | Water supply deoxidization system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020045362.3U CN212005640U (en) | 2020-01-09 | 2020-01-09 | Water supply deoxidization system |
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| CN212005640U true CN212005640U (en) | 2020-11-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112631343A (en) * | 2020-12-23 | 2021-04-09 | 浙江浙能绍兴滨海热电有限责任公司 | Method for controlling water level by parallelly operating multiple deaerators in main pipe system |
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2020
- 2020-01-09 CN CN202020045362.3U patent/CN212005640U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112631343A (en) * | 2020-12-23 | 2021-04-09 | 浙江浙能绍兴滨海热电有限责任公司 | Method for controlling water level by parallelly operating multiple deaerators in main pipe system |
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Address after: 100024 Gao Antun, Jinzhan Township, Chaoyang District, Beijing Patentee after: Beijing Chaoqing Environmental Energy Technology Co.,Ltd. Address before: 100024 Gao Antun, Jinzhan Township, Chaoyang District, Beijing Patentee before: Beijing Chaojing environmental protection energy technology Co.,Ltd. Address after: 100024 Gao Antun, Jinzhan Township, Chaoyang District, Beijing Patentee after: Beijing Chaoqing Environmental Protection Energy Technology Co.,Ltd. Address before: 100024 Gao Antun, Jinzhan Township, Chaoyang District, Beijing Patentee before: Beijing Chaoqing Environmental Energy Technology Co.,Ltd. |
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Effective date of registration: 20230105 Address after: No. 28, Room 201, Floor 3, Building 3, Yard 2, Louzizhuang, Chaoyang District, Beijing 100018 (Chaoyang Cluster, International Business Service Area, Beijing Pilot Free Trade Zone) Patentee after: Beijing Chaoyang Environment Group Co.,Ltd. Address before: 100024 Gao Antun, Jinzhan Township, Chaoyang District, Beijing Patentee before: Beijing Chaoqing Environmental Protection Energy Technology Co.,Ltd. |