Utility model content:
In order to by the heat storage of thermal power plant's excess steam caused by the low power consumption stage get up to be used for unit with
Peak regulation when electric high load capacity, the utility model disclose a kind of thermal power plant's fused salt accumulation of heat peak regulation system heated using main steam.With
Electric load reduce when, by high steam-fused salt heat exchanging device by the heat storage of boiler excess steam in high-temperature molten salt, fill
Divide the excessive main steam heat generated using boiler, improve boiler utilization rate, then utilizes high-temperature molten salt in the peak of power consumption stage
Heating boiler feed water simultaneously generates the generated energy that high temperature and high pressure steam is sent directly into increase unit in steam turbine, and realizes and adjust to unit
Peak effect.
The technical issues of the utility model solves is achieved through the following technical solutions:
A kind of thermal power plant's fused salt accumulation of heat peak regulation system heated using main steam, which includes main steam control valve
(1), high steam-fused salt heat exchanging device (2), reheated steam regulating valve (3), high temperature melting salt cellar (6), high-temperature melting salt pump (7), low
Temperature molten salt tank (10), low-temperature molten salt pump (11), throttle valve (13), the first high-pressure heater (14), the second high-pressure heater (17),
Feed pump (18), oxygen-eliminating device (19), boiler (20), high pressure cylinder (21), intermediate pressure cylinder (22);
Boiler export is connected with two-way major steam line, all the way main steam line enter steam turbine acting, i.e., respectively with vapour
High pressure cylinder (21), intermediate pressure cylinder (22) connection in turbine, high pressure cylinder (21) and boiler (20) connect into circuit;Another way main steam
Pipeline is successively connect with main steam control valve (1), the steam of main steam control valve (1) and high steam-fused salt heat exchanging device (2)
Side-entrance is connected;High steam-fused salt heat exchanging device (2) steam side outlet by the 5th regulating valve (12), throttle valve (13) with
First high-pressure heater (14) I grade heats water side entrance and is connected;High pressure cylinder (21) exhaust and the first high-pressure heater
(14) I grade steam side entrance is connected;First high-pressure heater (14) I grade heats water side outlet and high-pressure heater (14)
Section II grade heats water side entrance and is connected;First high-pressure heater (14) Section II grade heats water side outlet and oxygen-eliminating device (19) entrance phase
Even;First high-pressure heater (14) Section II grade water supply side entrance is connected by valve with feed pump (18) outlet;First high pressure adds
Hot device (14) Section II grade water supply side outlet is connected with the first high-pressure heater (14) I grade water supply side entrance;First high pressure simultaneously
Heater (14) I grade water supply side outlet is connected by the 7th regulating valve (16) with boiler (20) entrance;First high-pressure heater
(14) I grade water supply side outlet also passes through the 6th regulating valve (15) and high steam-fused salt heat exchanging device (2) steam side outlet phase
Even;High steam-fused salt heat exchanging device (2) steam side outlet successively with the 5th regulating valve (12), throttle valve (13), hyperbaric heating
Device (14) I grade water supply side outlet is connected, so that high steam-fused salt heat exchanging device (2) steam side outlet is successively adjusted with the 5th
Valve (12), throttle valve (13), the first high-pressure heater (14) I grade, the first high-pressure heater (14) Section II grade, feed pump
(18), oxygen-eliminating device (19) is sequentially connected, and forms the heating system at boiler feedwater end.
The steam side-entrance of high steam-fused salt heat exchanging device (2) also passes through in reheated steam regulating valve (3) and steam turbine
Cylinder pressure (22) connection, so that oxygen-eliminating device (19), feed pump (18), high-pressure heater (14), the 6th regulating valve (15), high pressure are steamed
Vapour-fused salt heat exchanging device (2), reheated steam regulating valve (3) and Steam Turbine Through IP Admission (22) are sequentially connected, and form boiler feedwater end
Vapo(u)rization system.
High pressure cylinder (21) exhaust is connected with the second high-pressure heater (17) I grade steam side entrance;Second high pressure adds
Hot device (17) I grade heating water side outlet is connected with high-pressure heater (17) Section II grade heating water side entrance;Second hyperbaric heating
Device (17) Section II grade heating water side outlet is connected with oxygen-eliminating device (19) entrance;Second high-pressure heater (17) Section II grade feedwater side enters
Mouth is connected by valve with feed pump (18) outlet;Second high-pressure heater (17) Section II grade water supply side outlet adds with the second high pressure
Hot device (17) I grade water supply side entrance is connected;Second high-pressure heater (17) I grade water supply side outlet and boiler (20) entrance phase
Even;Above-mentioned oxygen-eliminating device (19), feed pump (18), the Section II grade of the second high-pressure heater (17), I grade and high pressure cylinder (21)
It is sequentially connected, while the I grade of the second high-pressure heater (17) is connect by valve with boiler (20), is transported according to thermal power plant's original
Line mode heating boiler feed water;
Low-temperature molten salt tank (10) passes sequentially through low-temperature molten salt pump (11), the 4th regulating valve (9) is changed with high steam-fused salt
Hot device (2) fused salt side-entrance is connected;High steam-fused salt heat exchanging device (2) fused salt side outlet passes through the second regulating valve (5) and high
Temperature molten salt tank (6) is connected, above-mentioned to be used as hold over system;
High temperature melting salt cellar (6) is passed sequentially through high-temperature melting salt pump (7), the first regulating valve (4) to change with high steam-fused salt
Hot device (2) fused salt side outlet is connected;High steam-fused salt heat exchanging device (2) fused salt side-entrance passes through third regulating valve (8)
It is connected with low-temperature molten salt tank (10);The steam side-entrance of the high steam-fused salt heat exchanging device (2) is adjusted by reheated steam
Valve (3) is connected with reheaing steam pipe;It is above-mentioned to be used as thermal desorption system;
Heat exchange and exothermic phase in stage regenerator steam and fused salt may be implemented in high steam-fused salt heat exchanging device (2)
The heat exchange of fused salt and boiler feedwater.
The method of operation includes the following:
Timing under power load allows boiler heavy-duty service to generate excessive steam, and a part of main steam is according to power plant's original
Some working methods, which enter in steam turbine, does work, and another part main steam then passes through high steam-fused salt heat exchanging device (2)
It exchanges heat with the fused salt extracted out from low temperature cold salt cellar (10), the high pressure condensed water after heat exchange is through throttle valve (13) expenditure and pressure
After inject the first high-pressure heater (14), completed jointly with high pressure cylinder steam extraction with the heat exchange of water supply;
When power load increases, added with the fused salt in high warm salt cellar (6) by high steam-fused salt heat exchanging device (2)
Boiler feedwater of the heat after the first high-pressure heater (14) are heated, the high temperature and high pressure steam of generation flow through reheated steam regulating valve
(3) it is sent directly into steam turbine after, increases the air inflow of steam turbine, improved generated energy, Peak Load Adjustment is played to unit, after heat exchange
Low-temperature molten salt flow back in low temperature cold salt cellar (10), participate in next round circulation;The original feed water system of boiler of thermal power plant remains former
The method of operation: water supply flows into the second high-pressure heater (17) feeding boiler (20) after high pressure cylinder (21) pumping heating and continues to absorb heat
It evaporates and overheats.
Fused salt used in the accumulation of heat is the molten state of two or more inorganic salt mixt, and operating temperature exists
Between 300~1000 DEG C.
Compared with prior art, the utility model has the following beneficial effects:
(1) utilization rate that can give full play to boiler, improves the economy of boiler operatiopn;
(2) excess steam that boiler generates when recycling power load is lower is used for the peak regulation of peak of power consumption stage Power Plant
It uses, reaches energy-efficient purpose;
(3) due to the presence of hold over system, fired power generating unit flexibility is improved.
Detailed description of the invention:
Fig. 1 is Tthe utility model system structure connection diagram figure
Fig. 2 is hold over system operation schematic diagram.
Fig. 3 is thermal desorption system operation schematic diagram.
In figure: main steam control valve 1, high steam-fused salt heat exchanging device 2, reheated steam regulating valve 3, high temperature melting salt cellar 6,
High-temperature melting salt pump 7, low-temperature molten salt tank 10, low-temperature molten salt pump 11, throttle valve 13, high-pressure heater 14, high-pressure heater 17, water supply
Pump 18, oxygen-eliminating device 19, boiler 20, high pressure cylinder 21, intermediate pressure cylinder 22, the first regulating valve 4, the second regulating valve 5, third regulating valve 8, the
Four regulating valves 9, the 5th regulating valve 12, the 6th regulating valve 15, the 7th regulating valve 16.
Embodiment 1
Specific component connection, is shown in Fig. 1, accumulation of heat, and Fig. 2 is shown in work, and heat release operation schematic diagram is shown in Fig. 3.
Electricity consumption underload stage regenerator:
As shown in Fig. 2, keeping the operation of boiler full load, timing requires unit to reduce output power under power load, opens
Main steam control valve 1 closes reheated steam regulating valve 3, a part of main steam is made to enter vapour according to the original working method of power plant
It does work in turbine, another part main steam inflow high steam-fused salt heat exchanging device 2, regulating valve of blinding off a line 4,8,15,
It is sent into high steam-fused salt heat exchanging device 2 after fused salt in low temperature cold salt cellar 10 low-temperature molten salt is pumped 11 extractions, fused salt is added
It flow back into high warm salt cellar 6 and is stored after heat;With the high pressure condensed water after fused salt heat exchanging after 13 expenditure and pressure of throttle valve
The water supply come out from oxygen-eliminating device is heated in injection 14 somewhere of high-pressure heater and high pressure cylinder steam extraction jointly;It is heated by high-pressure heater 14
The water supply heated together with the original high-pressure heater 17 of system of water supply be fed together heat absorption in boiler and evaporate and overheat, enter
It does work in steam turbine.
Peak of power consumption exothermic phase:
As shown in figure 3, closing main steam control valve 1 and pipeline regulating valve 5,9,12,16 when peak of power consumption, open again
Hot steam regulating valve 3 keeps unit heavy-duty service.After high-temperature molten salt in high warm salt cellar 6 is extracted out with high-temperature melting salt pump 7
High steam-fused salt heat exchanging device 2 is flowed into, the boiler feedwater a part come out through oxygen-eliminating device 19 is according to original row side of thermal power plant
Formula is sent into boiler after the heating of high-pressure heater 17 absorbs heat, and another part water supply flows into high pressure after the heating of high-pressure heater 14
Exchange heat in steam-fused salt heat exchanging device 2 with high-temperature molten salt, generate high temperature and high pressure steam after by reheated steam regulating valve 3 into
Enter reheaing steam pipe, enters in steam turbine with reheated steam and do work;Low-temperature molten salt after heat exchange cooling flows back to low temperature cold
In salt cellar 10, next round circulation is participated in.