A kind of pipe heat exchanger water-supply and pressure-stabling system and misoperation control mode
Technical field
Patent of the present invention relates to a kind of water-supply and pressure-stabling system, the water-supply and pressure-stabling system of especially a kind of pipe heat exchanger and misoperation control mode.Belong to the control field of heat exchanger.
Background technology
For solving coal-burning power plant's ubiquitous " gypsum rain " problem at present, and meeting the emission request of flue gas pollutant increasingly stringent better, generally arrange pipe heat exchanger system, it is closed system under normal operating conditions.Often occur the problem that in running that in system, high-order equipment pressure is low, when flue-gas temperature is higher, in heat exchanger tube, heating agent coolant-temperature gage is corresponding higher, easily causes the vaporization of water;System long-play there will be the leakage of heat medium water equipment or pipeline, it is necessary to supplements heat medium water in time;Because of flue gas and variations in temperature etc. or heat medium water failure of pump, system causes that in system, pressure increases;System water supplement too much or temperature raise heat medium water expansion etc. and cause heating agent hypervolia in system;Oxygen-containing gas enters pipe heat exchanger system and easily causes equipment or pipeline scale etc..The appearance of the problems referred to above is all easily caused pipe heat exchanger system and can not steady in a long-term run, and even jeopardizes safety.
Summary of the invention
It is an object of the invention to overcome prior art not enough, it is provided that a kind of pipe heat exchanger water-supply and pressure-stabling system, it may be achieved the low liquid level moisturizing of system, high liquid level draining;High high pressure quick pressure releasing, high pressure exhaust pressure relief, low-pressure nitrogen charging pressurize, and fine adjustment can be realized.
For achieving the above object, present invention employs techniques below scheme:
This pipe heat exchanger water-supply and pressure-stabling system,
Including Nitrogen filling system, the pressure in order to maintain whole pipe heat exchanger system keeps constant, it is to avoid the vaporization of minimum pressure place heat medium water;Including nitrogen adjustment valve, nitrogen electric switching valve and connection pipeline;Nitrogen adjustment valve is stop valve, keeps relatively small guide vane, plays throttling action, it is prevented that moment nitrogen amount is excessive;It is normally closed under nitrogen electric switching valve normal operating condition, opens when hypotony in system;
Water charging system, in order to carry out moisturizing when upper water process and system are leaked to system, it is ensured that in heating agent blood circulation, water is full of;Including desalination water regulating valve, moisturizing electric switching valve and connection pipeline;Desalination water regulating valve is stop valve, keeps relatively small guide vane, plays throttling action, it is prevented that moment demineralized water flow is excessive;It is normally closed under moisturizing electric switching valve normal operating condition, when in system, water or leak causes opening when heat medium water water supply tank liquid level is too low;
Gas extraction system, is in suitable operating pressure in order to maintain system, it is ensured that system is superpressure not;Including exhaust regulating valve, discharge line valve, aerofluxus electric switching valve, relief valve and connection pipeline;Exhaust regulating valve is stop valve, keeps relatively small guide vane, plays throttling action, it is prevented that in the excessive system of moment capacity, pressure declines too fast;Discharge line valve is used for isolation maintenance aerofluxus electric switching valve;It is normally closed under aerofluxus electric switching valve normal operating condition, opens when superpressure in system;Relief valve take-off when pressure moment is excessive in system, it is ensured that system safety operation;
Drainage system, draining during in order to or maintenance too high in heat medium water water supply tank liquid level, it is prevented that expire very much influential system function because of the too much water tank of system water supplement;Including row's water regulating valve, drain stop valve, draining electric switching valve and connection pipeline;Row's water regulating valve is stop valve, keeps relatively small guide vane, plays throttling action, it is prevented that in the excessive system of moment displacement, liquid level declines too fast;Drain stop valve is used for isolation drainage for overhaul electric switching valve;It is normally closed under aerofluxus electric switching valve normal operating condition, opens when heat medium water water supply tank liquid level is too high;
Liquidometer with remote transfer signal and pressure transmitter respectively in order to monitor liquid level and the pressure of heat medium water water supply tank, in order to interlocked control nitrogen electric switching valve, moisturizing electric switching valve, aerofluxus electric switching valve, draining electric switching valve switch.
The misoperation control mode of this pipe heat exchanger water-supply and pressure-stabling system, comprises the steps:
Step one, the liquid level definite value arranging heat medium water water supply tank according to system and pressure definite value, containing normal level, low liquid level, high liquid level and normal pressure, low-pressure, high pressure and high high pressure.
Step 2, nitrogen electric switching valve and pressure transmitter interlocking, when pressure transmitter shows low-pressure, nitrogen electric switching valve is opened, and shows normal pressure to pressure transmitter.
Step 3, moisturizing electric switching valve are interlocked with the liquidometer with remote transfer signal, and when the liquidometer with remote transfer signal shows low liquid level, moisturizing electric switching valve is opened, and shows normal level to the liquidometer with remote transfer signal.
Step 4, aerofluxus electric switching valve and pressure transmitter interlocking, when pressure transmitter shows high pressure, aerofluxus electric switching valve is opened, and shows normal pressure to pressure transmitter.
Step 5, draining electric switching valve are interlocked with the liquidometer with remote transfer signal, and when the liquidometer with remote transfer signal shows high liquid level, draining electric switching valve is opened, and shows normal level to the liquidometer with remote transfer signal.
As preferably: when, in water or drainage procedure in system, each motor switch valve is forced manually opened or closes.
The invention has the beneficial effects as follows:
1, by arranging enclosed heat medium water water supply tank, whole pipe heat exchanger system lock, effectively prevent oxygen-containing gas from entering system and cause heat medium water that scale formation occurs.
2, heat medium water water-supply and pressure-stabling system can ensure whole heat exchanger system long-term stability safe operation.By nitrogen charging level pressure, the vaporization of water in effective anti-locking system.By aerofluxus release of pressure, effectively prevent system overpressure.By drainage system, effectively prevent heat medium water water supply tank moisturizing overfill.
3, can ensure to occur to regulate in time during misoperation in system, make the fast quick-recovery of system to normal operating condition.
4, system is simple and reliable, economical and practical, only passes through to arrange the manual of necessity and electrically operated valve and connect pipeline to realize several functions.
Accompanying drawing explanation
Fig. 1 is present system schematic diagram;
Description of reference numerals: heat medium water water supply tank 1, heating agent blood circulation 2, nitrogen adjustment valve 3, nitrogen electric switching valve 4, demineralized water adjustable valve 5, moisturizing electric switching valve 6, exhaust regulating valve 7, discharge line valve 8, aerofluxus electric switching valve 9, row water regulating valve 10, drain stop valve 11, draining electric switching valve 12, relief valve 13, the liquidometer 14 with remote transfer signal, pressure transmitter 15.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described further.The explanation of following embodiment is only intended to help and understands the present invention.It should be pointed out that, for those skilled in the art, under the premise without departing from the principles of the invention, it is also possible to the present invention carries out some improvement and modification, these improve and modify in the protection domain also falling into the claims in the present invention.
As it is shown in figure 1, the pipe heat exchanger water-supply and pressure-stabling system of the present embodiment, it is divided into four subsystems:
Nitrogen filling system, the pressure in order to maintain whole pipe heat exchanger system keeps constant, it is to avoid the vaporization of minimum pressure place heat medium water.Including nitrogen adjustment valve 3, nitrogen electric switching valve 4 and connection pipeline etc..Nitrogen adjustment valve 3 is stop valve, keeps relatively small guide vane, plays throttling action, it is prevented that moment nitrogen amount is excessive;It is normally closed under nitrogen electric switching valve 4 normal operating condition, opens when hypotony in system.
Water charging system, in order to carry out moisturizing when upper water process and system are leaked to system, it is ensured that in heating agent blood circulation, water is full of.Including desalination water regulating valve 5, moisturizing electric switching valve 6 and connection pipeline etc..Desalination water regulating valve 5 is stop valve, keeps relatively small guide vane, plays throttling action, it is prevented that moment demineralized water flow is excessive;It is normally closed under moisturizing electric switching valve 4 normal operating condition, when in system, water or leak causes opening when heat medium water water supply tank liquid level is too low.
Gas extraction system, is in suitable operating pressure in order to maintain system, it is ensured that system is superpressure not.Including exhaust regulating valve 7, discharge line valve 8, aerofluxus electric switching valve 9, relief valve 13 and connection pipeline etc..Exhaust regulating valve 5 is stop valve, keeps relatively small guide vane, plays throttling action, it is prevented that in the excessive system of moment capacity, pressure declines too fast;Discharge line valve 8 is used for isolation maintenance aerofluxus electric switching valve 9;It is normally closed under aerofluxus electric switching valve 9 normal operating condition, opens when superpressure in system.Relief valve 13 take-off when pressure moment is excessive in system, it is ensured that system safety operation.
Drainage system, draining during in order to or maintenance too high in heat medium water water supply tank liquid level, it is prevented that expire very much influential system function because of the too much water tank of system water supplement.Including row's water regulating valve 10, drain stop valve 11, draining electric switching valve 12 and connection pipeline etc..Row's water regulating valve 10 is stop valve, keeps relatively small guide vane, plays throttling action, it is prevented that in the excessive system of moment displacement, liquid level declines too fast;Drain stop valve 11 is used for isolation drainage for overhaul electric switching valve 12;It is normally closed under aerofluxus electric switching valve 12 normal operating condition, opens when heat medium water water supply tank liquid level is too high.
Liquidometer 14 with remote transfer signal and pressure transmitter 15 respectively in order to monitor liquid level and the pressure of heat medium water water supply tank, in order to the above-mentioned nitrogen electric switching valve 4 of interlocked control, moisturizing electric switching valve 6, aerofluxus electric switching valve 9, draining electric switching valve 12 switch.
The above-mentioned nitrogen electric switching valve 4 of the present invention, moisturizing electric switching valve 6, aerofluxus electric switching valve 9, draining electric switching valve 12 switch may be used without electromagnetic valve, above-mentioned nitrogen adjustment valve 3, demineralized water adjustable valve 5, exhaust regulating valve 7, row's water regulating valve 10 close to certain aperture before system is run, without special circumstances, no longer it is adjusted when system is properly functioning.
The misoperation control mode of this pipe heat exchanger water-supply and pressure-stabling system, comprises the steps:
Liquid level definite value and the pressure definite value of heat medium water water supply tank 1 are set according to system, containing normal level, low liquid level, high liquid level and normal pressure, low-pressure, high pressure and high high pressure.
Nitrogen electric switching valve 4 and pressure transmitter 15 are interlocked, and when pressure transmitter 15 shows low-pressure, nitrogen electric switching valve 4 is opened, and shows normal pressure to pressure transmitter 15.
Moisturizing electric switching valve 6 is interlocked with the liquidometer 14 with remote transfer signal, and when the liquidometer 14 with remote transfer signal shows low liquid level, moisturizing electric switching valve 6 is opened, and shows normal level to the liquidometer 14 with remote transfer signal.
Aerofluxus electric switching valve 9 and pressure transmitter 15 are interlocked, and when pressure transmitter 15 shows high pressure, aerofluxus electric switching valve 9 is opened, and shows normal pressure to pressure transmitter 15.
Draining electric switching valve 12 is interlocked with the liquidometer 14 with remote transfer signal, and when the liquidometer 14 with remote transfer signal shows high liquid level, draining electric switching valve 12 is opened, and shows normal level to the liquidometer 14 with remote transfer signal.
When, in water or drainage procedure in system, each motor switch valve is forced manually opened or closes.
The present invention is compared with the prior art: pipe heat exchanger generally arranges heat medium water water supply tank at present, itself or open design only realize water supplement function, or design of remaining silent realizes water supplement function and design safety valve realizes express delivery release of pressure function, and above-mentioned technology all can not meet the needs of pipe heat exchanger system stability safe operation.The present invention is by setting up valve and pipeline, and carries out corresponding interlocked control, it may be achieved several functions and regulable control under abnormality, and system is reasonable, practical.