CN211119308U - Steam-steam conversion system for radioactive site - Google Patents
Steam-steam conversion system for radioactive site Download PDFInfo
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- CN211119308U CN211119308U CN201921963320.1U CN201921963320U CN211119308U CN 211119308 U CN211119308 U CN 211119308U CN 201921963320 U CN201921963320 U CN 201921963320U CN 211119308 U CN211119308 U CN 211119308U
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Abstract
The utility model provides a vapour-vapour conversion system for radioactive site, it includes: the steam heat exchanger is also connected with a boiler room and process steam equipment through pipelines respectively, the drain cooler is also connected with the boiler room through a pipeline, and the deaerator is also connected with the process steam equipment through a pipeline; primary side steam generated by the boiler room is subjected to heat exchange and cooling treatment of the steam heat exchanger and the hydrophobic cooler in sequence to form primary side condensate water and returns to the boiler room; the deaerator is used for carrying out thermal deaerating on secondary side condensate water generated by the process steam equipment, and then forming secondary side steam and returning the secondary side steam to the process steam equipment after heat exchange and temperature rise treatment of the hydrophobic cooler and the steam heat exchanger in sequence. The utility model can indirectly prepare the steam for process production and isolate the primary heat supply network system from the process steam equipment; meanwhile, the condensed water on the primary side and the secondary side can be recycled, and the utilization rate of water resources is improved.
Description
Technical Field
The utility model relates to a spent fuel aftertreatment engineering technical field, concretely relates to vapour-vapour conversion system for radioactive site.
Background
In the production processes of spent fuel post-treatment, radioactive production engineering and the like, a large amount of low-pressure steam is needed, the low-pressure steam is possibly polluted by radioactivity, in order to protect workers and the environmental safety, in the past engineering, the steam is directly provided by a boiler room, and condensed water generated by a large amount of low-pressure steam used in equipment for heating feed liquid, heat preservation, residue steaming and the like is directly discharged to a pollution discharge cooling pond and is not recycled, so that the waste of a large amount of softened water and energy contained in the softened water is caused. In addition, the temperature of the condensed water is high, so that the use of additional water resources for temperature reduction is increased.
SUMMERY OF THE UTILITY MODEL
The present invention has been made to solve, at least in part, the technical problems occurring in the prior art.
Solve the utility model discloses the technical scheme that technical problem adopted is:
the utility model provides a vapour-vapour conversion system for radioactive site, it includes: the steam heat exchanger is also respectively connected with a boiler room and process steam equipment through pipelines, the drain cooler is also connected with the boiler room through a pipeline, and the deaerator is also connected with the process steam equipment through a pipeline; primary side steam generated by the boiler room is subjected to heat exchange and cooling treatment of the steam heat exchanger and the hydrophobic cooler in sequence to form primary side condensate water and returns to the boiler room; the deaerator is used for carrying out thermal deaerating on secondary side condensate water generated by the process steam equipment, and then forming secondary side steam and returning the secondary side steam to the process steam equipment after heat exchange and temperature rise treatment of the hydrophobic cooler and the steam heat exchanger in sequence.
Optionally, the steam-steam conversion system further comprises: the drain tank is connected with the steam heat exchanger and the drain cooler through pipelines respectively; the steam heat exchanger is used for releasing heat of primary side steam into saturated condensate water; the drain tank is used for receiving the saturated condensate water, automatically opening a drain valve of the drain tank when the water level in the drain tank exceeds the upper limit of a preset water level range, and draining water to the drain cooler; and when the water level in the water tank is lower than the lower limit of the preset range, the drain valve is automatically closed.
Optionally, two pipelines connected in parallel are arranged between the drain cooler and the boiler room, wherein the first pipeline is directly communicated with the drain cooler and the boiler room, and a condensate tank and a condensate pump are sequentially arranged on the second pipeline along the water flow direction; the steam-steam conversion system further includes: the pressure measuring device comprises a pressure measuring device and two electric valves which are respectively and electrically connected with the pressure measuring device, wherein the two electric valves are respectively arranged on the two pipelines; the pressure measuring device is used for measuring the pressure of the primary side condensate water output by the drainage cooler in real time, opening the electric valve on the first pipeline and closing the electric valve on the second pipeline when the measured pressure exceeds the upper limit of a preset pressure range, and closing the electric valve on the first pipeline and opening the electric valve on the second pipeline when the pressure is lower than the lower limit of the preset pressure range.
Optionally, the steam heat exchanger is further connected with the condensed water tank through a pipeline; the steam-steam conversion system further includes: and the blowdown tank is arranged on a pipeline between the steam heat exchanger and the condensed water tank and is also connected with cooling water.
Optionally, a pipeline between the blowdown tank and the condensed water tank, and a pipeline between the drain cooler and the condensed water tank are connected to the condensed water tank through a multi-way network.
Optionally, secondary side condensate water generated by process steam equipment and system water are fed into the deaerator together, and thermal deaerator is performed after mixing.
Optionally, the steam-steam conversion system further comprises: and the water supply pump is arranged on a pipeline between the deaerator and the drainage cooler and is used for pressurizing secondary side condensed water subjected to deaerating treatment to the sum of secondary side steam pressure and system resistance.
Optionally, the steam heat exchanger is further connected with the deaerator through a pipeline, so that a part of secondary side steam output by the steam heat exchanger returns to process steam equipment, and another part of secondary side steam enters the deaerator.
Optionally, the steam heat exchanger is a double-flow loop, detachable heat transfer tube bundle shell-and-tube heat exchanger.
Optionally, the shell side of the steam heat exchanger is designed to be conical, and a part of evaporation cavities are reserved at the upper part.
Has the advantages that:
the steam-steam conversion system of the utility model can indirectly prepare steam for process production (namely secondary side steam), and also isolate a boiler room of a primary heat supply network system from process steam equipment, so that primary and secondary side steam pipe networks are isolated to prevent pollution of steam pipe networks of a whole plant caused by leakage of the process steam equipment, and radioactive leakage pollution accidents which may occur are controlled in the secondary side steam pipe network which is relatively small, thereby avoiding influencing the primary side steam pipe network to cause other steam systems to be stopped; meanwhile, the condensed water on the primary side and the secondary side can be recycled, and the utilization rate of water resources is improved.
Drawings
FIG. 1 is a schematic structural view of a steam-steam conversion system for a radioactive site according to the present invention;
fig. 2 is an application schematic diagram of the steam-steam conversion system for radioactive sites according to the present invention.
In the figure: 1-a steam heat exchanger; 2-a hydrophobic cooler; 3-water supply pump; 4-a deaerator; 5-a sewage draining tank; 6-a drain tank; 7-condensation water tank; 8-a condensate pump; 100-boiler room; 200-a steam-steam conversion system; 300-process steam equipment; 400-condensate recovery unit.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be described in further detail with reference to the accompanying drawings and examples.
To the wasting of resources problem that exists among the prior art, the embodiment of the utility model provides a vapour-vapour conversion system for radioactive site, specially adapted steam supply and condensate water processing system for spent fuel aftertreatment engineering technology.
As shown in fig. 1 and 2, the steam-steam conversion system includes: the steam heat exchanger 1, the hydrophobic cooler 2 and the deaerator 4 are connected in sequence through pipelines. The steam heat exchanger 1 is also respectively connected with the boiler room 100 and the process steam equipment 300 through pipelines; the drain cooler 2 is also connected with the boiler room 100 through a pipeline; the deaerator 4 is further connected with the process steam equipment 300 through a pipeline, specifically, a condensate water recovery device 400 is further arranged between the deaerator 4 and the process steam equipment 300, namely, secondary side condensate water generated by the process steam equipment 300 is recovered through the condensate water recovery device 400 and then is input into the deaerator 4.
The primary side steam generated by the boiler room 100 is subjected to heat exchange and cooling treatment by the steam heat exchanger 1 and the hydrophobic cooler 2 in sequence to form primary side condensate water, and the primary side condensate water returns to the boiler room 100; the deaerator 4 is used for carrying out thermal deaerating on secondary side condensate water generated by the process steam equipment 300, and then forming secondary side steam and returning the secondary side steam to the process steam equipment 300 after heat exchange and temperature rise treatment of the hydrophobic cooler 2 and the steam heat exchanger 1 in sequence. In other words, the heat of the primary side steam is used to heat the secondary side condensate water after the deoxidation treatment through the two heat exchange devices, namely the steam heat exchanger 1 and the hydrophobic cooler 2, the primary side steam is cooled to form the primary side condensate water, and the secondary side condensate water after the deoxidation treatment is heated to form the secondary side steam.
Therefore, the steam-steam conversion system can indirectly prepare steam for process production (namely secondary side steam), and also isolate a boiler room of a primary heat supply network system from process steam equipment, so that a primary side steam pipe network and a secondary side steam pipe network are isolated to prevent pollution of a whole plant steam pipe network caused by leakage of the process steam equipment, and possible radioactive leakage pollution accidents are controlled in the secondary side steam pipe network which is relatively small, so that the primary side steam pipe network is prevented from being influenced to stop other steam systems; meanwhile, the condensed water on the primary side and the secondary side can be recycled, and the utilization rate of water resources is improved.
As shown in fig. 1, the steam-steam conversion system further includes: and the drain tank 6 is respectively connected with the steam heat exchanger 1 and the drain cooler 2 through pipelines. The steam heat exchanger 1 is used for releasing heat of primary side steam into saturated condensate water; the drain tank 6 is used for receiving saturated condensate water, and automatically opening a drain valve and draining water to a drain cooler when the water level in the drain tank exceeds the upper limit of a preset water level range; and when the water level in the water tank is lower than the lower limit of the preset range, the drain valve is automatically closed.
It can be seen that the drain tank 6 has the functions of controlling the high and low water levels and automatically draining water. The upper limit and the lower limit of the preset water level range can be set by those skilled in the art according to actual conditions.
As shown in fig. 1, two pipelines connected in parallel are arranged between the drain cooler 2 and the boiler room 100, wherein the first pipeline directly connects the drain cooler 2 and the boiler room 100, and the second pipeline is sequentially provided with a condensate tank 7 and a condensate pump 8 along the water flow direction. Wherein, the condensation water tank 7 is specifically a closed condensation water tank.
The steam-steam conversion system further includes: the pressure measuring device and the two electric valves are respectively electrically connected with the pressure measuring device, and the two electric valves are respectively arranged on the two pipelines. The pressure measuring device is used for measuring the pressure of the primary side condensate water output by the hydrophobic cooler 2 in real time, and when the measured pressure exceeds the upper limit of a preset pressure range, the electric valve on the first pipeline is opened and the electric valve on the second pipeline is closed, at the moment, the pressure of the primary side condensate water meets the requirement, and the primary side condensate water output by the hydrophobic cooler 2 can be directly sent to the boiler room 100; and when the pressure is lower than the lower limit of the preset pressure range, closing the electric valve on the first pipeline and opening the electric valve on the second pipeline, wherein the pressure of the primary side condensate water is not satisfactory, and the primary side condensate water needs to be stored in the condensate water tank 7 and pressurized by the condensate pump 8 and then sent to the boiler room 100 to prevent flash evaporation.
As for the upper limit and the lower limit of the preset pressure range, the upper limit and the lower limit can be set by those skilled in the art according to actual conditions, for example, the upper limit of the preset pressure range can be set to 0.24MPa, that is, the primary side condensed water is directly sent to the boiler room when the pressure of the primary side condensed water exceeds 0.24 MPa; the degree to which the condensate pump 8 boosts the primary-side condensate is related to the upper limit and the lower limit of the preset pressure range.
As shown in fig. 1, the steam heat exchanger 1 is also connected to a condensate tank 7 by a pipe. The steam-steam conversion system further includes: the blowdown tank 5 is arranged on the pipeline between the steam heat exchanger 1 and the condensation water tank 7, and the blowdown tank 5 is also connected with cooling water for cooling the condensation water output to the blowdown tank 5 by the steam heat exchanger 1 and then discharged to the condensation water tank 7 after cooling.
Further, a pipeline between the sewage tank 5 and the condensed water tank 7 and a pipeline between the hydrophobic cooler 2 and the condensed water tank 7 are connected into the condensed water tank through a multi-way network.
In this embodiment, the multichannel is netted the ware altogether and is installed and collect the department in the net altogether, can make the condensate water of different pressure grades share one set of device (promptly condensate tank 7) and retrieve, and it utilizes the condensate water that pressure is high to make the efflux, and the condensate water that will press low is drawn and is penetrated closed condensate tank 7.
As shown in fig. 1, the secondary side condensed water generated by the process steam equipment 300 enters the deaerator 4 together with the system water, and is subjected to thermal deaerating after being mixed.
The steam-steam conversion system further includes: and the water supply pump 3 is arranged on a pipeline between the deaerator 4 and the drain cooler 2. The water supply pump 3 is used for pressurizing the secondary side condensed water after the oxygen removal treatment to the sum of the secondary side steam pressure and the system resistance.
As shown in fig. 1, the steam heat exchanger 1 is further connected to the deaerator 4 through a pipeline, so that a part of the secondary steam output by the steam heat exchanger 1 returns to the process steam equipment 300, and another part enters the deaerator 4. As for the ratio of the secondary steam returned to the process steam equipment 300 to the secondary steam entering the deaerator 4, it can be set by those skilled in the art according to actual conditions.
The steam heat exchanger 1 employed in the present embodiment is specifically described below.
The steam heat exchanger 1 adopts a double-flow loop and a detachable heat transfer tube bundle shell-and-tube heat exchanger, in particular to a horizontal pressure vessel, which can design the heat exchange area according to rated working condition parameters, but needs to increase 5% of pipe blocking allowance on the basis.
The steam heat exchanger 1 belongs to a two-phase heat exchanger. The two-phase heat exchanger realizes the optimized combination of different structural forms of the high-efficiency heat exchanger by setting different flow distribution and different proportions of cold and hot fluids, and is constructed into composite phase-change heat exchangers in different specific forms. Compared with the traditional heat exchanger, the heat exchanger can greatly reduce the exhaust temperature of waste gas and simultaneously maintain the wall temperature of the heating surface of the whole low-temperature section at a higher temperature level, thereby not only improving the thermal efficiency of heat-using equipment to the greatest extent, but also avoiding the phenomena of low-temperature corrosion and ash blockage caused by condensation.
Accordingly, the steam heat exchanger 1 should be designed in a conical shape on the shell side, and a part of the evaporation cavity is reserved on the upper part, so that the steam heat exchanger is equivalent to a key reboiler and consists of a larger shell and an internal tube bundle.
The interface of the steam heat exchanger 1 comprises: a pipe side steam supply pipe interface, a pipe side condensate pipe interface, a shell side steam supply pipe interface, a shell side water supply pipe interface, an exhaust pipe interface, a safety valve interface, a continuous sewage pipe interface, a periodic sewage pipe interface, a pressure gauge, a thermometer, a liquid level meter interface and the like. Wherein, the pipe side steam supply pipe interface is connected with the boiler room 100 through a pipeline; the exhaust pipe interface is connected with the process steam equipment 300 through a pipeline; the pipe side condensate pipe interface is connected with the drain tank 6 through a pipeline; the shell side water supply pipe connector is connected with the drainage cooler 2 through a pipeline; the continuous sewage discharge pipe interface is connected with the sewage discharge tank 5 through a pipeline.
The working principle of the steam-steam converting system according to the present embodiment will be described with reference to fig. 1 and 2.
The primary side high-pressure steam from the boiler room 100 enters the steam heat exchanger 1 to heat the secondary side feed water from the drain cooler 1 and then becomes saturated condensate water, and the secondary side feed water is heated and generates low-pressure saturated steam; saturated condensate water output by the steam heat exchanger 1 enters a drain tank 6, the saturated condensate water from the drain tank 6 enters a drain cooler 2, secondary side condensate water after deoxygenation treatment is preheated and then enters a condensate water recovery system as primary side condensate water, and the condensate water is returned to the boiler room 100 after recovery treatment; the low-pressure saturated steam output by the steam heat exchanger 1 is used as secondary side steam and sent to each process steam equipment 300; secondary side steam is condensed, cooled and tested by the process steam equipment and then returns to the deaerator 4 as secondary side condensate water, the secondary side condensate water returned by the process steam equipment 300 and system water supplement are deaerated by the deaerator 4, pressurized by the water supply pump 3 and then sent to the hydrophobic cooler 2, and preheated by the hydrophobic cooler 2 and then enters the steam heat exchanger 1 to circulate.
The following describes the operation flow of the steam-steam conversion system according to the present embodiment with reference to fig. 1 and 2.
1) Primary side steam-condensate conversion process:
high-pressure steam (about 1.1 MPa) on the primary side enters the steam heat exchanger 1 after being regulated by a regulating valve to be released into saturated condensate water (about 184.1 ℃), the saturated condensate water enters the drain tank 6, the saturated condensate water from the drain tank 6 enters the drain cooler 2 to preheat secondary side condensate water after being subjected to deoxidization, the saturated condensate water is cooled to obtain condensate water on the primary side (about 126 ℃), the condensate water is determined to be directly discharged to a condensate water pipe network on the primary side according to the pressure (if the pressure reaches 0.24MPa) of the condensate water, and then the condensate water is sent to the boiler room 100 or is discharged to the condensate water tank 7 firstly, is pressurized by the condensate water pump 8 and then discharged to the condensate water pipe network on the primary side, and then the condensate water is sent to the boiler room 100 to prevent flash.
2) Secondary side condensed water-steam conversion process:
secondary side condensate water and system water supply generated by the process steam equipment 300 enter a deaerator 4, the condensate water is heated to about 104.8 ℃ by steam to carry out thermal deoxidization, the secondary side condensate water after deoxidization is pressurized to the sum of secondary side steam pressure and system resistance through a water supply pump 3, then the condensate water is sent to the shell side of a hydrophobic cooler 2 to be preheated, the condensate water is used as secondary side feed water (about 165 ℃) after preheating and enters a steam heat exchanger 1 to be reheated, saturated steam (about 0.85 MPa) under the conditions required by the process is formed, one path of saturated steam is used as the secondary side steam and sent to a secondary side steam pipe network to be used by the process steam equipment 300, and the other path of the condensate water is sent to the deaerator 4.
In order to ensure the quality of the secondary side steam and the efficiency of the steam heat exchanger 1, a continuous drain pipe is arranged on the shell side of the steam heat exchanger 1 and is drained to a drain tank 5, and the cold water introduced into the drain tank 5 is cooled and then drained to a condensation water tank 7.
To sum up, the utility model provides a vapour-vapour conversion system is used in radioactive place is by steam heat exchanger 1, oxygen-eliminating device 4, hydrophobic cooler 2, drain tank 6, blowdown jar 5, closed condensate water jar 7, working shaft 3, condensate pump 8, and corresponding controlling means, auxiliary pipeline and valve etc. constitute, it can be with one, the secondary side steam pipe network is kept apart, and the steam of the required quality of water of preparation technology production, still can effectively prevent to cause the radioactive contamination of whole factory steam pipe network when the steam equipment is revealed for the technology, simultaneously with one, the condensate water recycle of secondary side, realize safety, energy-conserving purpose.
It is to be understood that the above embodiments are merely exemplary embodiments that have been employed to illustrate the principles of the present invention, and that the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A steam-to-steam conversion system for a radioactive site, comprising: the steam heat exchanger is also respectively connected with a boiler room and process steam equipment through pipelines, the drain cooler is also connected with the boiler room through a pipeline, and the deaerator is also connected with the process steam equipment through a pipeline; primary side steam generated by the boiler room is subjected to heat exchange and cooling treatment of the steam heat exchanger and the hydrophobic cooler in sequence to form primary side condensate water and returns to the boiler room; the deaerator is used for carrying out thermal deaerating on secondary side condensate water generated by the process steam equipment, and then forming secondary side steam and returning the secondary side steam to the process steam equipment after heat exchange and temperature rise treatment of the hydrophobic cooler and the steam heat exchanger in sequence.
2. The steam-to-steam conversion system of claim 1, further comprising: the drain tank is connected with the steam heat exchanger and the drain cooler through pipelines respectively; the steam heat exchanger is used for releasing heat of primary side steam into saturated condensate water; the drain tank is used for receiving the saturated condensate water, automatically opening a drain valve of the drain tank when the water level in the drain tank exceeds the upper limit of a preset water level range, and draining water to the drain cooler; and when the water level in the water tank is lower than the lower limit of the preset range, the drain valve is automatically closed.
3. The steam-steam conversion system according to claim 1, wherein two pipelines are arranged in parallel between the drain cooler and the boiler room, wherein the first pipeline is directly communicated with the drain cooler and the boiler room, and a condensate tank and a condensate pump are sequentially arranged on the second pipeline along the water flow direction; the steam-steam conversion system further includes: the pressure measuring device comprises a pressure measuring device and two electric valves which are respectively and electrically connected with the pressure measuring device, wherein the two electric valves are respectively arranged on the two pipelines; the pressure measuring device is used for measuring the pressure of the primary side condensate water output by the drainage cooler in real time, opening the electric valve on the first pipeline and closing the electric valve on the second pipeline when the measured pressure exceeds the upper limit of a preset pressure range, and closing the electric valve on the first pipeline and opening the electric valve on the second pipeline when the pressure is lower than the lower limit of the preset pressure range.
4. The steam-to-steam conversion system of claim 3, wherein the steam heat exchanger is further connected to the condensate tank by a conduit; the steam-steam conversion system further includes: and the blowdown tank is arranged on a pipeline between the steam heat exchanger and the condensed water tank and is also connected with cooling water.
5. The steam-to-steam conversion system of claim 4, wherein the piping between the blowdown tank and the condensate tank, and the piping between the drain cooler and the condensate tank, are connected to the condensate tank by a multiplexing network.
6. The steam-steam conversion system of claim 1, wherein secondary side condensate water produced by process steam equipment enters the deaerator together with system makeup water, and thermal deaerating is performed after mixing.
7. The steam-to-steam conversion system of claim 6, further comprising: and the water supply pump is arranged on a pipeline between the deaerator and the drainage cooler and is used for pressurizing secondary side condensed water subjected to deaerating treatment to the sum of secondary side steam pressure and system resistance.
8. The steam-to-steam conversion system of claim 1, wherein the steam heat exchanger is further connected to the deaerator by a conduit such that a portion of the secondary side steam output by the steam heat exchanger returns to process steam equipment and another portion enters the deaerator.
9. The steam-to-steam conversion system of any one of claims 1-8, wherein the steam heat exchanger employs a dual-flow loop, removable heat transfer tube bundle shell and tube heat exchanger.
10. The steam-to-steam conversion system of claim 9, wherein the shell side of the steam heat exchanger is tapered and an upper portion reserves a partial evaporation cavity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921963320.1U CN211119308U (en) | 2019-11-13 | 2019-11-13 | Steam-steam conversion system for radioactive site |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921963320.1U CN211119308U (en) | 2019-11-13 | 2019-11-13 | Steam-steam conversion system for radioactive site |
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| CN211119308U true CN211119308U (en) | 2020-07-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113503656A (en) * | 2021-06-24 | 2021-10-15 | 中国核电工程有限公司 | Heat energy recovery system and method for steam generation system and spent fuel post-treatment system |
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2019
- 2019-11-13 CN CN201921963320.1U patent/CN211119308U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113503656A (en) * | 2021-06-24 | 2021-10-15 | 中国核电工程有限公司 | Heat energy recovery system and method for steam generation system and spent fuel post-treatment system |
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