CN211424362U - Deaerator preheating system capable of improving steam output supplied from back pressure unit - Google Patents
Deaerator preheating system capable of improving steam output supplied from back pressure unit Download PDFInfo
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- CN211424362U CN211424362U CN201922375146.5U CN201922375146U CN211424362U CN 211424362 U CN211424362 U CN 211424362U CN 201922375146 U CN201922375146 U CN 201922375146U CN 211424362 U CN211424362 U CN 211424362U
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Abstract
The utility model discloses a can improve oxygen-eliminating device preheating system of backpressure unit external supply steam output relates to power generation equipment technical field. The system comprises a first heat exchanger, wherein a pipe side inlet and a pipe side outlet of the heat exchanger are respectively connected with a main water supply pipeline through a water inlet main pipe and a water return main pipe, and a shell side inlet and a shell side outlet of the first heat exchanger are respectively connected with a flue. The water supply system is characterized in that a first adjusting valve group is arranged between a water inlet main pipe and a water return main pipe on the main water supply pipeline, and a pipeline pump group is arranged on the water inlet main pipe. The temperature control device is characterized in that a recirculation pipeline is arranged between the water inlet main pipe and the water return main pipe, a second regulating valve group is arranged on the recirculation pipeline, a third regulating valve group and a first thermometer are respectively arranged at the upstream and the downstream of a second water return point on the water inlet main pipe, and a pipeline pump group is arranged at the downstream of the second water return point. By adding the preheating system, the amount of externally supplied steam can be increased without increasing fuel.
Description
Technical Field
The utility model belongs to the technical field of the power generation facility technique and specifically relates to a can improve oxygen-eliminating device preheating system of backpressure unit outer steam production that supplies.
Background
In a boiler system of a thermal power plant, a deaerator mainly functions to remove oxygen and other gases in boiler feed water and meet the quality requirement of the feed water. Meanwhile, the deaerator is used as a mixed heater in a regenerative heating system, can heat boiler feed water, and improves the boiler feed water temperature.
The working principle of the deaerator is that steam with stable pressure is introduced into the deaerator to heat water supply, the partial pressure of the steam on the water surface is gradually increased, the partial pressure of other gases is gradually reduced, and the gases in the water are continuously separated out.
As shown in figure 2, the water taken by the existing back pressure unit is generally directly taken from boiler water supply, because the back pressure unit is not provided with a low-pressure heater, the boiler water supply entering a deaerator is basically at about 30 ℃ of normal temperature, the deaerator is required to extract steam to heat to more than 104 ℃, and the steam is originally supplied to users outside a factory, so that the yield of the steam supplied outside the back pressure unit can be indirectly reduced, and the energy waste is caused.
SUMMERY OF THE UTILITY MODEL
To the problem the utility model provides a can improve oxygen-eliminating device preheating system of backpressure unit external supply steam output, through increasing this preheating system, the steam heat that is used for heating the oxygen-eliminating device of extraction in the follow steam can reduce, and outer user just can be supplied with to the steam of saving, is equivalent to under the condition that does not increase fuel, and the steam of producing more has increased energy-conserving benefit.
The utility model provides a technical scheme that its technical problem adopted is:
a deaerator preheating system capable of improving the output of externally supplied steam of a backpressure unit comprises a first heat exchanger, wherein a pipe side inlet and a pipe side outlet of the heat exchanger are respectively connected with a main water supply pipeline through a water inlet main pipe and a water return main pipe, and a shell side inlet and a shell side outlet of the first heat exchanger are respectively connected with a flue;
a first regulating valve group is arranged on the main water supply pipeline between the water inlet main pipe and the water return main pipe;
and a pipeline pump set is arranged on the water inlet main pipe.
Furthermore, the water inlet main pipe is provided with a second water return point, the water return main pipe is provided with a second water taking point, a recirculation pipeline is arranged between the second water taking point and the second water return point, the recirculation pipeline is provided with a second regulating valve group, a third regulating valve group and a first thermometer are respectively arranged at the upstream and the downstream of the second water return point on the water inlet main pipe, and the pipeline pump group is arranged at the downstream of the second water return point.
Furthermore, a second thermometer is arranged on the water inlet main pipe at the upstream of a second water return point, and a third thermometer is arranged on the water return main pipe at the downstream of the second water taking point.
Furthermore, a flowmeter is arranged on the return water main pipe and positioned at the upstream of the second water taking point.
Furthermore, a safety valve is arranged on the water inlet main pipe and between the first heat exchanger and the pipeline pump group.
Furthermore, the water inlet main pipe is provided with a second heat exchanger between a second water return point and a third regulating valve group, a pipe side inlet and a pipe side outlet of the second heat exchanger are respectively connected with the water inlet main pipe, and a shell side inlet and a shell side outlet of the second heat exchanger are respectively connected with an oxygen discharging steam pipeline of a deaerator.
Furthermore, a second heat exchanger bypass pipeline connected with the second heat exchanger in parallel is arranged on the water inlet main pipe, and a valve used for controlling the on-off of the second heat exchanger bypass pipeline is arranged on the second heat exchanger bypass pipeline.
Furthermore, a drain pipe is arranged at the outlet of the return water main pipe on the return water main pipe.
Furthermore, a sampling port is arranged on the sewage draining pipe.
Further, the first heat exchanger is arranged on a horizontal flue between the air preheater and the dust remover.
The utility model has the advantages that:
1. through setting up first heat exchanger, heat the boiler feedwater to improve the temperature of the demineralized water that gets into the oxygen-eliminating device, and then reduce the extraction volume of steam, like this, under the condition of equal fuel, can effectual increase the steam production of backpressure unit, the benefit is high, and recovery cycle is short.
2. Through setting up the recirculation pipeline, connect a pipeline from the female pipe of return water, be connected to the female pipe of intaking, take a part of return water after the heating and be used for mixing into water to control the temperature of intaking above the design value, avoid causing acid dew point to corrode because the temperature is low excessively.
3. Through set up the second heat exchanger on flue gas heat exchanger female pipe of intaking, shift the heat of oxygen-eliminating device oxygen extraction steam to flue gas heat transfer system, can carry out effectual utilization with oxygen-eliminating device oxygen elimination steam heat.
4. Through set up the regulating valve group on main water supply pipeline, provide the pressure differential (suppressing pressure to main water supply pipeline promptly) of first water intaking point and first backwater point, can make sufficient quantity demineralized water enter into first heat exchanger in the one hand, the flow of guide medium, on the other hand can adjust the flow of the demineralized water that gets into first heat exchanger to cater for the temperature variation of flue gas in the first heat exchanger.
Drawings
FIG. 1 is a diagram of a deaerator preheating system;
FIG. 2 is a diagram of a conventional deaerator media flow system;
in the figure: 1-main water supply pipeline, 11-first water taking point, 12-first water returning point, 13-first regulating valve group, 2-water inlet main pipe, 21-pipeline pump group, 22-safety valve, 23-second water returning point, 24-first thermometer, 25-second thermometer, 26-third regulating valve group, 3-first heat exchanger, 4-water returning main pipe, 41-blow-off pipe, 411-sampling port, 42-flowmeter, 43-second water taking point, 44-third thermometer, 5-recirculation pipeline, 51-second regulating valve group, 6-second heat exchanger, 7-second heat exchanger bypass pipeline and 8-deaerator oxygen discharging steam pipeline.
Detailed Description
As shown in figure 1, the deaerator preheating system capable of improving the output of externally supplied steam of the backpressure unit comprises a water inlet main pipe 2 and a water return main pipe 4 which are arranged on a main water supply pipeline 1. One end of the water inlet main pipe 2 is communicated with the main water supply pipeline 1, and a first water taking point 11 is formed at the joint of the water inlet main pipe 2 and the main water supply pipeline 1; and the other end of the water inlet main pipe 2 is connected with a pipe side inlet of the first heat exchanger 3. One section of the water return main pipe 4 is communicated with the main water supply pipeline 1, and a first water return point 12 is formed at the joint of the water return main pipe 4 and the main water supply pipeline 1; the other end of the return water main pipe 4 is connected with a pipe side outlet of the first heat exchanger 3. And a shell side inlet and a shell side outlet of the first heat exchanger 3 are respectively connected with a flue. Preferably, the first heat exchanger 3 is arranged on a horizontal flue between the air preheater and the dust remover.
A first regulating valve group 13 is arranged on the main water supply pipeline 1 between the first water taking point 11 and the first water return point 12.
The governing valve group including establish ties first manual gate valve, flow control valve and the manual gate valve of second on the main entrance in proper order, just first manual gate valve, flow control valve and the manual gate valve of second constitute the main entrance valves jointly, the main entrance on be provided with the parallelly connected bypass passageway of main entrance valves, the last third manual gate valve that is provided with of bypass passageway. The first manual gate valve, the second manual gate valve, and the third manual gate valve are mainly used to replace or repair the flow rate adjustment valve without stopping the machine. The flow control valve can control the flow by adjusting the opening degree, can be directly purchased in a outsourcing mode, belongs to the prior art, and is not described herein any more, and as a specific implementation, the flow control valve in the embodiment adopts IQ12F10A, which is named as ROTORK by the manufacturer.
What go on above is the description to the regulating valve group, specifically to in this patent, explains the mounted position of valve with first regulating valve group 13 as an example, and flow control valve, first manual gate valve and the manual gate valve of second among the first regulating valve group 13 are installed on main water supply pipe 1, main water supply pipe 1 on be provided with bypass channel, the manual gate valve of third install on bypass channel. The second and third regulating valve groups 51 and 26 are similar to the first regulating valve group 13 and will not be described again.
As shown in fig. 1, a pipe pump set 21 is disposed on the water inlet main pipe 2, and the pipe pump set 21 is prior art and will not be described herein again.
Further, because the backpressure unit is not provided with a low-pressure heater, the boiler feed water entering the deaerator is basically at the normal temperature of about 30 ℃, and the temperature is far lower than the design value of the water temperature at the inlet of the first heat exchanger 3. If the heat exchange tube enters the first heat exchanger 3 at the temperature, the wall temperature of the heat exchange tube is far lower than the acid dew point, the corrosion of the wall of the heat exchange tube can be caused in a short time, and the leakage of the heat exchange tube is caused.
In order to solve the problem, as shown in fig. 1, a recirculation pipe 5 is arranged between the water inlet main pipe 2 and the water return main pipe 4, one end of the recirculation pipe 5 is communicated with the water inlet main pipe 2, and a second water return point 23 is formed at the joint of the recirculation pipe 5 and the water inlet main pipe 2; the other end of the recirculation pipeline 5 is communicated with the return water main pipe 4, and a second water taking point 43 is formed at the joint of the recirculation pipeline 5 and the return water main pipe 4. The recirculation pipeline 5 is provided with a second regulating valve group 51, a third regulating valve group 26 is arranged on the water inlet main pipe 2 at the upstream of the second water return point 23, the pipeline pump group 21 is arranged at the downstream of the second water return point 23, and a first thermometer 24 is arranged at the outlet of the second water return point 23 on the water inlet main pipe 2.
During operation, two situations can be distinguished:
1. when the water flow that needs to preheat is less, need not suppress promptly and just can enter into the sufficient flow of main pipe of intaking, at this moment, owing to need not suppress, first regulating valve group 13 is in full open state, according to the aperture proportion of the temperature regulation second regulating valve group 51 that first thermometer 24 shows and third regulating valve group 26 to the temperature control of intaking of messenger's first heat exchanger 3 is on the design value, avoids causing the acid dew point corrosion of heat transfer pipe wall because the temperature is too low.
2. When the water flow rate to be preheated is large, a sufficient pressure difference is generated between the first water taking point and the first water return point by suppressing pressure (namely, adjusting the opening degree of the first adjusting valve group), so that a sufficient amount of water enters the water inlet main pipe. At this time, the third regulating valve group on the water inlet main pipe is fully opened, and the opening ratio of the first regulating valve group 13 and the second regulating valve group 51 is regulated according to the temperature displayed by the first thermometer 24, so that the water inlet temperature of the first heat exchanger 3 is controlled above a designed value, and the acid dew point corrosion of the heat exchange pipe wall caused by too low temperature is avoided.
Further, a second temperature meter 25 is arranged at an inlet of the second water return point 23 on the water inlet main pipe 2, and a third temperature meter 44 is arranged at an outlet of the second water taking point 43 on the water return main pipe 4.
Further, on one hand, because the load and the water supply quantity of the unit are unstable, the oxygen discharging steam quantity of the deaerator is unstable, most of the steam of the existing thermal power plant can be directly discharged, and some plants can discharge the part of the steam to the unit continuous discharge system and recycle the part of the steam after condensation. On the other hand, because the back pressure unit generally has a small unit capacity, generally below 150MW, the coal burned by the small unit is generally low-quality coal containing a large amount of sulfur, and the acid dew point is generally above 90 ℃. If the inlet temperature at the tube side of the first heat exchanger 3 is to be maintained above the acid dew point, the inlet water temperature needs to be maintained at 80 ℃. The ratio of the amount of the recirculated water to the amount of the taken water is 5:2 calculated according to the temperature of 30 ℃ of the boiler fed water and 100 ℃ of the return water, most of heat is used for heating the recirculated water, and the actually recovered heat is far lower than the heat released by smoke temperature reduction.
For this purpose, as shown in fig. 1, a second heat exchanger 6 is disposed on the water inlet main pipe 2 between the second water return point 23 and the third regulating valve group 26, a pipe side inlet and a pipe side outlet of the second heat exchanger 6 are respectively connected to the water inlet main pipe 2, and a shell side inlet and a shell side outlet of the second heat exchanger 6 are respectively connected to the deaerator oxygen discharge steam pipeline 8.
Therefore, boiler feed water of about 30 ℃ of the water inlet main pipe exchanges heat with oxygen-removing steam of the oxygen remover through the second heat exchanger 6, the boiler feed water is heated to about 50 ℃ from about 30 ℃ by using heat of the oxygen-removing steam (the specific temperature needs to be determined according to the amount and the temperature of the oxygen-removing steam), and then the 3 return water of the first heat exchanger is mixed with the inlet water through the recycling pipe and is heated to about 80 ℃ as required. At the moment, the ratio of the recycled water to the water intake is 3:2, the recycled water amount is reduced, the amount of the recycled water returning to the first heat exchanger 3 of the deaerator is increased, the recovered heat is increased, the benefit is improved, and the project investment recovery period is shortened.
Further, in order to facilitate the maintenance of the second heat exchanger 6, as shown in fig. 1, a second heat exchanger bypass pipeline 7 connected in parallel with the second heat exchanger 6 is arranged on the water inlet main pipe 2, and a valve for controlling the on-off of the second heat exchanger bypass pipeline 7 is arranged on the second heat exchanger bypass pipeline 7.
Preferably, a flow meter 42 is arranged on the water returning main pipe 4 and is positioned upstream of the second water taking point 43.
Preferably, a safety valve 22 is arranged on the water inlet header 2 between the first heat exchanger 3 and the pipe pump group 21. As a specific implementation mode, the safety valve 22 in the embodiment adopts A48Y-40, which is manufactured by Harbin power station valves.
Preferably, a drain pipe 41 is arranged on the return water main pipe 4 at the outlet of the return water main pipe 4.
Preferably, the drain pipe 41 is provided with a sampling port 411. The pipeline needs to be washed before being put into operation, water after washing is discharged through the drain pipe 41, and the sampling port 411 is used for sampling to detect whether the water quality after washing is qualified.
Claims (10)
1. The utility model provides a can improve oxygen-eliminating device preheating system of backpressure unit external supply steam output which characterized in that: the heat exchanger comprises a first heat exchanger, wherein a pipe side inlet and a pipe side outlet of the heat exchanger are respectively connected with a main water supply pipeline through a water inlet main pipe and a water return main pipe, and a shell side inlet and a shell side outlet of the first heat exchanger are respectively connected with a flue;
a first regulating valve group is arranged on the main water supply pipeline between the water inlet main pipe and the water return main pipe;
and a pipeline pump set is arranged on the water inlet main pipe.
2. The system of claim 1, wherein the deaerator preheating system is configured to increase steam production from an external supply of the backpressure unit, and comprises: the water inlet main pipe is provided with a second water return point, the water return main pipe is provided with a second water taking point, a recirculation pipeline is arranged between the second water taking point and the second water return point, a second regulating valve group is arranged on the recirculation pipeline, a third regulating valve group and a first thermometer are respectively arranged at the upstream and the downstream of the second water return point on the water inlet main pipe, and the pipeline pump group is arranged at the downstream of the second water return point.
3. The system of claim 2, wherein the deaerator preheating system is configured to increase steam production from an external supply of the backpressure unit, and comprises: and a second thermometer is arranged on the upstream of the second water return point on the water inlet main pipe, and a third thermometer is arranged on the downstream of the second water taking point on the water return main pipe.
4. The system of claim 2, wherein the deaerator preheating system is configured to increase steam production from an external supply of the backpressure unit, and comprises: and a flowmeter is arranged on the return water main pipe and positioned at the upstream of the second water taking point.
5. The system of claim 2, wherein the deaerator preheating system is configured to increase steam production from an external supply of the backpressure unit, and comprises: and a safety valve is arranged on the water inlet main pipe and between the first heat exchanger and the pipeline pump group.
6. The system of claim 1, wherein the deaerator preheating system is configured to increase steam production from an external supply of the backpressure unit, and comprises: the main pipe of intaking on be located second return water point and third regulating valve group between be provided with the second heat exchanger, the pipe side import and the pipe side export of second heat exchanger respectively with the main pipe of intaking link to each other, the shell side import and the shell side export of second heat exchanger link to each other with oxygen-eliminating device row oxygen steam pipe way respectively.
7. The system of claim 6, wherein the deaerator preheating system is configured to increase steam production from an external supply of the backpressure unit, and comprises: and a second heat exchanger bypass pipeline connected with the second heat exchanger in parallel is arranged on the water inlet main pipe, and a valve for controlling the on-off of the second heat exchanger bypass pipeline is arranged on the second heat exchanger bypass pipeline.
8. The system of claim 1, wherein the deaerator preheating system is configured to increase steam production from an external supply of the backpressure unit, and comprises: and a sewage discharge pipe is arranged at the outlet of the return water main pipe.
9. The system of claim 8, wherein the deaerator preheating system is configured to increase steam production from an external supply of the backpressure unit, and further comprises: the drain pipe is provided with a sampling port.
10. The system of claim 1, wherein the deaerator preheating system is configured to increase steam production from an external supply of the backpressure unit, and comprises: the first heat exchanger is arranged in a flue between the air preheater and the dust remover.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922375146.5U CN211424362U (en) | 2019-12-25 | 2019-12-25 | Deaerator preheating system capable of improving steam output supplied from back pressure unit |
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| CN201922375146.5U CN211424362U (en) | 2019-12-25 | 2019-12-25 | Deaerator preheating system capable of improving steam output supplied from back pressure unit |
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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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2019
- 2019-12-25 CN CN201922375146.5U patent/CN211424362U/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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