CN214840749U - Multistage flash evaporation system for recovering boiler deep peak shaving wet water - Google Patents
Multistage flash evaporation system for recovering boiler deep peak shaving wet water Download PDFInfo
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- CN214840749U CN214840749U CN202120543271.7U CN202120543271U CN214840749U CN 214840749 U CN214840749 U CN 214840749U CN 202120543271 U CN202120543271 U CN 202120543271U CN 214840749 U CN214840749 U CN 214840749U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 106
- 238000001704 evaporation Methods 0.000 title claims abstract description 9
- 230000008020 evaporation Effects 0.000 title claims abstract description 9
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 65
- 238000011084 recovery Methods 0.000 claims description 7
- 238000009834 vaporization Methods 0.000 claims 1
- 230000008016 vaporization Effects 0.000 claims 1
- 238000000605 extraction Methods 0.000 abstract description 6
- 230000008878 coupling Effects 0.000 description 7
- 238000010168 coupling process Methods 0.000 description 7
- 238000005859 coupling reaction Methods 0.000 description 7
- 238000007701 flash-distillation Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 239000003245 coal Substances 0.000 description 4
- 230000002209 hydrophobic effect Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
本实用新型公开了一种回收锅炉深度调峰湿态水的多级闪蒸系统，本实用新型通过新增三级闪蒸罐，将末级高压加热器的进汽由高压抽汽变为一级闪蒸罐产生的饱和蒸汽，除氧器的进汽由四段抽汽变为二级闪蒸罐产生的饱和蒸汽，末级低压加热器的进汽由低压抽汽变为三级闪蒸罐产生的饱和蒸汽，本实用新型通过设置三级闪蒸系统，回收锅炉深度调峰湿态水的热量和质量，在高能湿态水量较大时，停运其余高压加热器和其余低压加热器的一个或多个，以利用更多闪蒸出的饱和蒸汽，实现能量利用的最大化，大大提高了机组在深度调峰湿态运行时的经济性。
The utility model discloses a multi-stage flashing system for recovering the deep peak-shaving wet water of a boiler. The utility model adds a three-stage flashing tank to change the inlet steam of the last-stage high-pressure heater from high-pressure extraction to a single-stage flashing system. The saturated steam generated by the first-stage flash tank, the inlet steam of the deaerator is changed from the fourth-stage extraction steam to the saturated steam generated by the second-stage flash tank, and the inlet steam of the last-stage low-pressure heater is changed from the low-pressure extraction steam to the third-stage flash. The saturated steam generated by the tank, the utility model recovers the heat and quality of the wet water in the deep peak regulation of the boiler by setting a three-stage flash system, and when the high-energy wet water volume is large, the rest of the high-pressure heaters and the rest of the low-pressure heaters are stopped. One or more of them can be used to utilize more saturated steam from flash evaporation to maximize energy utilization and greatly improve the economy of the unit when it operates in a deep peak-shaving wet state.
Description
Technical Field
The utility model belongs to steam turbine energy saving and consumption reduction field, concretely relates to retrieve multistage flash distillation system of wet attitude water of boiler degree of depth peak shaving.
Background
With the promotion of energy conservation and emission reduction and the development of new energy, the operation from deep peak regulation to low load of the thermal power generating unit becomes a normal state. When the load of the boiler is more than 30%, the steam generated by the boiler is larger than the flow of the water wall, so that the superheated steam flows through the steam-water separator, but no water exists in the steam-water separator, and the boiler operates in a dry state. When the unit is subjected to deep peak shaving to be below 30% of rated load, steam generated in the boiler is smaller than the flow of the water wall, and the steam-water separator operates in a wet state. This situation is therefore referred to as wet operation of the boiler. And the redundant saturated water in the steam-water separator is discharged under the control of a steam-water separator liquid level control system. Saturated water separated by the steam-water separator enters the water storage tank and is usually directly discharged into a drainage flash tank or a condenser through a liquid level control valve. Because the water separated by the steam-water separator is saturated water under the water supply pressure, the water belongs to high-energy hydrophobic water, if the water is not recycled, a large amount of heat and quality loss are caused, and the operation economy is reduced.
Disclosure of Invention
An object of the utility model is to overcome the above-mentioned not enough, provide a multistage flash distillation system of retrieving wet attitude water of boiler degree of depth peak shaving, the high energy saturation that catch water produced when can make full use of boiler wet attitude operation is hydrophobic, economic nature when improving the wet attitude operation of unit low-load.
In order to achieve the aim, the utility model comprises a water storage tank, a primary flash tank, a secondary flash tank and a tertiary flash tank;
the water storage tank is connected with the steam-water separator, the water storage tank is connected with the first-level flash tank, the saturated water pipeline of the first-level flash tank is connected with the second-level flash tank, the saturated steam pipeline of the first-level flash tank is connected with the first-level high-pressure heater, the saturated water pipeline of the second-level flash tank is connected with the third-level flash tank, the saturated steam pipeline of the second-level flash tank is connected with the deaerator, the saturated steam pipeline of the third-level flash tank is connected with the last-stage low-pressure heater, and the saturated water pipeline of the third-level flash tank is connected with the condenser.
And a saturated steam pipeline of the steam-water separator is connected with the superheater.
And a liquid level control valve is arranged on a connecting pipeline of the water storage tank and the primary flash tank.
One side of the final-stage low-pressure heater is connected with the primary heater, and the other side of the final-stage low-pressure heater is connected with the deaerator.
The deaerator is connected with the primary heater, and a water feeding pump is arranged on a connecting pipeline of the deaerator and the primary heater.
The first-stage high-pressure heater is connected with the last-stage high-pressure heater.
The last-stage high-pressure heater is connected with an economizer, the economizer is connected with a water-cooled wall, and the water-cooled wall is connected with a steam-water separator.
Compared with the prior art, the utility model discloses an increase tertiary flash tank newly, introduce the one-level flash tank with partial high-energy wet water at first, produce saturated steam and saturated water under the certain pressure. Introducing all the saturated steam flashed out into the steam side of the first-stage high-pressure heater to replace high-pressure extracted steam to heat the feed water; introducing all the saturated water flashed out into a secondary flash tank to generate saturated steam and saturated water under certain pressure, introducing all the saturated steam flashed out into the steam side of a deaerator to replace four-stage steam extraction, and introducing all the saturated water flashed out into a tertiary flash tank to generate saturated steam and saturated water under certain pressure. The whole saturated steam that the flash distillation goes out introduces last stage low pressure feed water heater vapour side, replaces low pressure extraction steam heating condensate water, the utility model discloses a set up tertiary flash distillation system, the heat and the quality of the wet attitude water of recovery boiler degree of depth peak shaving, when the wet attitude water yield of high energy is great, the one or more of all the other high pressure feed water heaters and all the other low pressure feed water heaters of shut down to utilize more saturated steam that flash distillation goes out, realize energy utilization's maximize, improved the economic nature of unit when the wet attitude of degree of depth peak shaving moves greatly.
Drawings
FIG. 1 is a system configuration diagram of the present invention;
the system comprises a steam-water separator 1, a water storage tank 2, a superheater 3, a primary flash tank 4, a secondary flash tank 5, a secondary flash tank 6, a tertiary flash tank 7, a final high-pressure heater 8, a primary high-pressure heater 9, a water feed pump 10, a deaerator 11, a final low-pressure heater 12, a primary low-pressure heater 13, an economizer 14, a water wall 15, a liquid level control valve 16 and a condenser.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
Referring to fig. 1, the utility model comprises a water storage tank 2, a primary flash tank 4, a secondary flash tank 5 and a tertiary flash tank 6;
Referring to fig. 1, the working method of the present invention includes the following steps:
step one, introducing wet water of a boiler into a first-stage flash tank 4 by a water storage tank 2 to generate saturated steam and saturated water;
step two, replacing the original high-pressure extracted steam with saturated steam generated by the primary flash tank 4, introducing the saturated steam into a high-pressure heater 8 for heating the feed water entering the high-pressure heater, and introducing the saturated water of the primary flash tank 4 into the secondary flash tank 5;
step three, replacing the original four-stage steam extraction with saturated steam generated by the secondary flash tank 5, introducing the saturated steam into a deaerator 10 to heat condensed water entering the deaerator 10, and introducing saturated water of the secondary flash tank 5 into a tertiary flash tank 6;
and step three, replacing the original low-pressure extracted steam by saturated steam generated by the three-level flash tank 6, introducing the saturated steam into a low-pressure heater 11 for heating the condensed water entering the low-pressure heater, and introducing the generated saturated water into a condenser 16.
The rated load of a coal-fired steam turbine set of a certain power plant is 350MW, when the deep peak shaving of the unit is to 20% rated load (70MW) operation, 77.7t/h high-energy hydrophobic is separated out in the wet state of the boiler, through the utility model discloses reform transform the back, introduce 1 MPa's one-level flash tank earlier, produce 21.5t/h saturated steam and 56.2t/h saturated water, saturated steam all gets into 2 # high pressure, and 3 # high pressure adds at this moment and stops the transportation; saturated water is continuously introduced into the second-level flash tank with the pressure of 0.5MPa to generate saturated steam with the pressure of 3.3t/h and saturated water with the pressure of 52.9t/h, all the saturated steam enters the deaerator, the saturated water is continuously introduced into the third-level flash tank with the pressure of 0.1MPa to generate saturated steam with the pressure of 5.2t/h and saturated water with the pressure of 47.7t/h, all the saturated steam enters the low pressure condenser with the pressure of No. 7, the saturated water finally enters the condenser, and all the saturated steam generated by the flash evaporation system is recycled by the unit.
The heat balance of the unit after being reformed by recovering wet water under 20 percent rated load is simulated through Ebsilon software. According to calculation, when 77.7t/h of high-energy hydrophobic water is completely discharged into a condenser, the heat consumption rate of a unit is about 9269.7kJ/(kWh), and the reduced coal consumption rate is about 347.3 g/(kWh); after reconstruction and recovery, 77.7t/h high-energy drainage enters a first-stage flash tank, a second-stage flash tank and a third-stage flash tank in sequence, all generated saturated steam is respectively introduced into a high-pressure heater, a deaerator and a low-pressure heater, and the No. 3 high-pressure heater is stopped, so that the heat consumption rate of a unit is about 8698.4kJ/(kWh), the reduced coal consumption rate is about 325.9g/(kWh), and compared with the heat consumption rate when the high-energy drainage is discharged into a condenser and is not recycled, the heat consumption rate is reduced by 571.3kJ/(kWh), the coal consumption rate is reduced by 21.4g/(kWh), and the amplitude is reduced by about 6.16%. It is thus clear that according to the utility model discloses retrieve wet water and reform transform back unit heat consumption rate and coal consumption rate and descend by a wide margin under 20% rated load, the operation economic nature improves greatly.
Claims (7)
1. A multi-stage flash evaporation system for recovering deep peak shaving wet water of a boiler is characterized by comprising a water storage tank (2), a primary flash evaporation tank (4), a secondary flash evaporation tank (5) and a tertiary flash evaporation tank (6);
catch water (1) is connected in water storage tank (2), one-level flash tank (4) is connected in water storage tank (2), the saturated water pipe connection second grade flash tank (5) of one-level flash tank (4), the saturated steam pipe connection one-level high pressure feed water heater (8) of one-level flash tank (4), the saturated water pipe connection tertiary flash tank (6) of second grade flash tank (5), the saturated steam pipe connection oxygen-eliminating device (10) of second grade flash tank (5), the saturated steam pipe connection final stage low pressure feed water heater (11) of tertiary flash tank (6), the saturated water pipe connection condenser (16) of tertiary flash tank (6).
2. A multistage flash system for recovering boiler deep peaked wet water according to claim 1, characterized in that the saturated steam line of the steam-water separator (1) is connected with the superheater (3).
3. A multistage flash system for deep peaking of wet water for recovery boilers in accordance with claim 1 wherein a level control valve (15) is provided on a connection line of the water storage tank (2) and the primary flash tank (4).
4. A multistage flash vaporization system for deep peaked wet water of recovery boilers according to claim 1, characterized by the fact that the last stage low-pressure heater is connected on one side to the first stage heater (12) and on the other side to the deaerator (10).
5. The multistage flash evaporation system for the deep peak shaving wet water of the recovery boiler according to claim 1, characterized in that the deaerator (10) is connected with the primary heater (8), and a water feeding pump (9) is arranged on a connecting pipeline between the deaerator (10) and the primary heater (8).
6. A multistage flash system for deep peaked wet water of recovery boilers according to claim 1, characterized by the fact that the first stage high pressure heater (8) is connected to the last stage high pressure heater (7).
7. A multi-stage flash system for deep peaking wet water of recovery boilers according to claim 6, characterized in that the last stage high pressure heater (7) is connected with an economizer (13), the economizer (13) is connected with a water wall (14), and the water wall (14) is connected with the steam-water separator (1).
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| CN202120543271.7U CN214840749U (en) | 2021-03-16 | 2021-03-16 | Multistage flash evaporation system for recovering boiler deep peak shaving wet water |
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| CN202120543271.7U CN214840749U (en) | 2021-03-16 | 2021-03-16 | Multistage flash evaporation system for recovering boiler deep peak shaving wet water |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112902142A (en) * | 2021-03-16 | 2021-06-04 | 西安热工研究院有限公司 | Multistage flash evaporation system for recovering boiler deep peak shaving wet-state water and working method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112902142A (en) * | 2021-03-16 | 2021-06-04 | 西安热工研究院有限公司 | Multistage flash evaporation system for recovering boiler deep peak shaving wet-state water and working method |
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