CN104235870A

CN104235870A - Condenser dead steam waste heat recovery and energy saving device and energy saving method

Info

Publication number: CN104235870A
Application number: CN201410518220.3A
Authority: CN
Inventors: 冯留建
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-10-01
Filing date: 2014-10-01
Publication date: 2014-12-24

Abstract

Provided is a condenser dead steam waste heat recovery and energy saving device. A power plant turbine exhaust port is cooled by a power plant cooling system. The condenser dead steam waste heat recovery and energy saving device is characterized in that circulating water carrying dead steam waste heat is conveyed to a cooling tower through a circulating water pump, a circulating water pump outlet primary pipe is connected with a branch, one part of the circulating water to be conveyed to the cooling tower is guided to an inlet of a primary fan and an inlet of a blower in the middle of a boiler through the circulating water branch, and a small indirect cooling tower connected with the circulating water is built at the position. The inlet of the primary fan and the inlet of the blower are formed in the upper portion of the small indirect cooling tower, the fan operates on the upper portion to form negative pressure, air enters from the bottom of the small indirect cooling tower, heat exchange is carried out on the air and the small indirection cooling tower to form hot air, the hot air is supplied into a hearth through the fan, and the dead steam waste heat of part of the hot air is recovered. The circulating water cooled by the small indirect cooling tower is connected to a condenser water inlet primary pipe, and continues to be supplied into a condenser, the dead steam waste heat in the condenser is absorbed, and therefore the whole dead steam waste heat recovery process is completed.

Description

Condenser exhaust steam residual heat reclaims energy saver and power-economizing method

Technical field

The present invention relates to a kind of utilize condenser exhaust steam residual heat to reclaim energy saver and power-economizing method, be specifically related to thermal power plant condenser cooling circulating water system and boiler air and flue system.

Background technology

Thermal power plant is in power generation process, the exhaust steam of steam after steam turbine acting, enter condensation heat release in condenser, this part condensation heat is recycled water-band to cooling tower directly discharged to air, discharges heat generally accounts for more than 15% of input gross energy, cause huge energy waste, how these UTILIZATION OF VESIDUAL HEAT IN discharged to air to be got up is a current Thermal Power Station difficult problem.

Summary of the invention

The technical problem mainly solved of the present invention is to provide a kind of energy saver from condenser cool cycles Water Sproading condenser exhaust steam residual heat and power-economizing method, this energy saver and power-economizing method are transformed accordingly condenser circulation and air and flue system, originally burner hearth to will be sent into discharged to the heat of air through air and flue system, recovery section exhaust steam residual heat, thus improve the integrated heat efficiency of power plant, reduce gross coal consumption rate, and multiple stage unit can a public little indirect cool tower, can energy-saving effect be made double under the prerequisite that cost does not increase.

For solving the problem, technical scheme of the present invention is as follows: condenser exhaust steam residual heat reclaims energy saver, comprise power plant steam turbine exhaust outlet to be cooled by circulating cooling water of power plant system, the recirculated water carrying exhaust steam residual heat is sent to cooling tower through water circulating pump, export on female pipe at water circulating pump and connect branch road, the a part of recirculated water will delivering to cooling tower causes boiler primary air fan and air blower inlet place through this branch road, sets up the small-sized indirect cool tower (heat-exchanger rig) be connected with recirculated water at this place; The First air of boiler, Secondary Air entrance are arranged on small-sized indirect cool tower top, fan operation forms negative pressure on top, air enters bottom small-sized indirect cool tower, hot-air is formed with after the heat exchange of little indirect cool tower inner fins, hot-air is sent into burner hearth by blower fan, thus recovery section exhaust steam residual heat, be connected to recirculated water backwater mother pipe through the cooled water of small-sized indirect cool tower, thus complete whole exhaust steam residual heat removal process;

Utilize above-mentioned energy saver to realize energy-conservation method to comprise the following steps:

1) during summer operation, directly the component loops water carrying the heat of condensation is delivered to small-sized indirect cool tower through branch road automatic hydraulic flow regulator, primary air fan, pressure fan run the hot-air after drawing heat exchange, and by it feeding burner hearth, realize waste heat recovery; Primary air fan and pressure fan cooling segment recirculated water make circulating water temperature decline, and improve condenser vacuum, realize unit efficiency and improve;

2) during winter operation, power plant steam turbine is being guaranteed under safe prerequisite, appropriateness improves the pressure that power plant steam turbine runs back pressure, thus improve the adiabatic condensation temperature of exhaust steam in condenser of power plant steam turbine, meet small-sized indirect cool tower return water temperature more than 40 DEG C, prevent small-sized indirect cool tower bursting by freezing, under the prerequisite of safe operation ensureing unit, primary air fan, pressure fan wind run the hot-air after drawing heat exchange and are sent into burner hearth, realize waste heat recovery;

3) above-mentioned energy saver is utilized to reclaim thermal power plant's condenser exhaust steam residual heat and corresponding power-economizing method, summer, winter all can improve wind pushing temperature, recovery waste heat, improve the efficiency of combustion of boiler, reach energy-saving and cost-reducing object, suitably can reduce circulating water temperature summer comparatively speaking, improve condenser vacuum, improve the Steam Turbine thermal efficiency, winter then increases substantially wind pushing temperature, especially relatively and north cold area, its exhaust steam residual heat recovering effect is better, improves the efficiency of combustion in boiler in winter simultaneously.

Condenser exhaust steam residual heat reclaims input and the use of energy saver, under the prerequisite improving unit efficiency, can replace the device such as First air steam air heater, Secondary Air steam air heater, investment reduction cost simultaneously.

For two units, a small-sized indirect cool tower can be shared, thus save construction cost.

Exhaust steam residual heat reclaims energy saver and can independently arrange, namely independently heat-exchanger rig is set in condenser, absorb condenser exhaust steam residual heat, water circulating pump follows to be delivered to little indirect cool tower by the water carrying exhaust steam residual heat and carries out heat exchange, water after heat exchange enters condenser and absorbs condenser exhaust steam residual heat, forms complete cycle.

Accompanying drawing explanation

Fig. 1 is condenser exhaust steam residual heat retracting device System Implementation schematic diagram.

Fig. 2 is that condenser exhaust steam residual heat retracting device systemic circulation water system arranges schematic diagram separately.

In Fig. 1,1 is low pressure (LP) cylinder, 2 condensers, and 3 is water circulating pump, and 4 is the female pipe of water circulating pump outlet, and 5 is cooling tower, and 6 is the female pipe of condenser water inlet, and 7 is automatic hydraulic flow regulator, and 8 is little indirect cool tower, and 9 is primary air fan, and 10 is pressure fan, and 11 is boiler.

In Fig. 2,1 is low pressure (LP) cylinder, 2 condensers, and 3 is water circulating pump, and 4 is the female pipe of water circulating pump outlet, 5 is cooling tower, and 6 is the female pipe of condenser water inlet, and 7 is automatic hydraulic flow regulator, and 8 is water circulating pump, 9 is little indirect cool tower, and 10 is pressure fan, and 11 is primary air fan, and 12 is boiler.

Detailed description of the invention

Little indirect cool tower recirculated water connects from cooling-tower circulating water, the exhaust steam of low pressure (LP) cylinder 1 discharge is after circulating water as shown in Figure 1, condense into liquid, vacuum environment is set up in condenser 2, the water carrying exhaust steam residual heat is delivered to the female pipe 4 of circulating water outlet by water circulating pump 3, go out a part at the female pipe 4 of circulating water outlet and deliver to cooling tower 5, a part delivers to little indirect cool tower 8 through automatic hydraulic flow regulator 7; Deliver to condenser 2 through the cooled recirculated water of cooling tower 5, continue circulating cooling, keep condenser vacuum; The recirculated water delivering to little indirect cool tower 8 is delivered to condenser and to be intake female pipe 6 after little indirect cool tower 8 cools, primary air fan 9 air channel and entrance pressure fan 10 tunnel inlet are arranged on little indirect cool tower 8 top, primary air fan 9 and pressure fan 10 operate in its inlet conduits and go out to form negative pressure, ambient wind is sucked from pipeline cold between bottom, thus realize cooling circulating water, improve the object of entrance wind-warm syndrome, burner hearth is sent in the effect through blower fan, realizes the raising of steam power plant's operational efficiency.

Little indirect cool tower recirculated water is arranged separately, heat-exchanger rig is arranged on condenser 2 top as shown in Figure 2, in order to absorb the exhaust steam residual heat that low pressure (LP) cylinder 1 is discharged, after automatic hydraulic flow regulator 7 regulates, deliver to little indirect cool tower 9, after water circulating pump 8 pressurizes, form whole exhaust steam residual heat reclaim circulation, remaining waste heat is cooled by former circulating water cooling system.

Adopt the energy-saving effect of condenser exhaust steam residual heat recovery energy saver as follows, solidifying unit is taken out for a 300MW, unit annual utilization hours calculates with 5012 hours (Electricity Monitoring Commission's conventional Thermal generation unit 6000 kilowatts of national areas tracking in 2013 and above power plants generating electricity equipment on average utilize hourage), and First air, Secondary Air total blast volume calculate with intake 1200 t/h:

1) after adopting the technology of the present invention transformation, for indirect cooling system (indirect cooling tower), direct air cooling system (Air-Cooling Island), summer generally can improve First air, Secondary Air entrance wind-warm syndrome 20 DEG C, the type of cooling of little indirect cool tower belongs to air blast cooling, increase area of dissipation, circulating water temperature can be reduced when summer operation, improve condenser vacuum, the journey resistance that prolongs that its benefit brought can be brought with little indirect cool tower substantially offsets, winter generally can improve First air, Secondary Air entrance wind-warm syndrome can improve 40 DEG C, spring and autumn generally can improve First air, Secondary Air entrance wind-warm syndrome 30 DEG C, in summer, for wet cooling tower system, circulating water temperature and ambient temperature differences are at 8-15 degree Celsius, the temperature difference is less, heat-recoverable is less, can determine whether stop transport, autumn and winter, recovering effect was then more or less the same with indirect cooling system and direct air cooling system according to actual conditions,

2) through energy saver described above, for indirect cooling system (indirect cooling tower), direct air cooling system (Air-Cooling Island), summer is per hour through First air, Secondary Air recyclable condenser exhaust steam residual heat about 24000 MJ, the first quarter in summer (being evenly distributed to the four seasons by annual utilization hours), recyclable condenser exhaust steam residual heat about 30072000 MJ, was equivalent to saving 1026 tons of standard coals; Spring and autumn is per hour through First air, Secondary Air recyclable condenser exhaust steam residual heat about 36000 MJ, and spring, season in autumn two recyclable condenser exhaust steam residual heat about 90216000 MJ, is equivalent to saving 3079 tons of standard coals; Winter recyclable condenser exhaust steam residual heat about 48000 MJ per hour, the first quarter in winter, recyclable condenser exhaust steam residual heat about 60144000 MJ, was equivalent to saving 2052 tons of standard coals, added up to every platform 300,000 unit can save 6157 tons of standard coals every year; If wet cooling tower system, then using summer residual heat recovering effect is relatively poor, and northern as longer in regional winters such as Xinjiang for China, and mostly adopts the unit of indirect air cooling and direct air cooling system because of lack of water, and its energy-saving effect is better;

3) energy saver as above, two public little indirect cool towers of unit then when cost does not increase, then energy-saving effect and energy saving profit double;

4) energy saver as above, can reduce First air steam air heater, the installation of Secondary Air steam air heater equipment and use.

Little indirect cool tower as above, cooler tube bundle between its arrangement only need have accordingly, its arrangement can have various ways, as directly circulating water pipeline caused fans entrance, recirculated water heat-exchanging tube bundle is arranged in corresponding fans entrance, playing the effect replacing steam air heater, also can be the small-sized indirect cool tower only having bottom heat exchange fin.

In sum, the present invention can bring big business's economic benefit, environmental benefit.

Claims

1. condenser exhaust steam residual heat reclaims energy saver, comprises condenser exhaust steam residual heat retracting device and to be directly connected with cooling circulating water branch road and condenser exhaust steam residual heat retracting device independently arranges two schemes; Condenser exhaust steam residual heat retracting device is directly connected with cooling circulating water branch road, then comprise power plant steam turbine exhaust outlet to be cooled by electric power plant cooling system, it is characterized in that the recirculated water carrying condensation heat is sent to cooling tower through water circulating pump, export on female pipe at water circulating pump and connect a branch road, the recirculated water of cooling tower will be delivered to through recirculated water branch road, cause boiler primary air fan and pressure fan air inlet by automatic hydraulic flow regulator, set up the small-sized indirect cool tower be connected with recirculated water at this place; Primary air fan, air blower inlet are arranged on small-sized indirect cool tower top, and fan operation forms negative pressure on top, and air enters bottom small-sized indirect cool tower, and form hot-air with after indirect cool tower heat exchange, hot-air is sent into burner hearth by blower fan, recovery section exhaust steam residual heat; Be connected to the female pipe of condenser water inlet through the cooled recirculated water of small-sized indirect cool tower, continue to be fed into condenser, absorb the exhaust steam heat of condensation in condenser, thus complete whole exhaust steam residual heat removal process; Condenser exhaust steam residual heat retracting device is independently arranged, comprise and heat-exchanger rig is arranged on condenser, in order to absorb exhaust steam residual heat in condenser, the recirculated water absorbing waste heat delivers to little indirect cool tower, after air heat-exchange through automatic hydraulic flow regulator, be back to condenser and continue heat exchange, water circulating pump provides power for whole circulation, through with little indirect cool tower heat exchange after hot-air, through primary air fan, boiler delivered to by overfire air fan, thus completes whole condenser exhaust steam residual heat removal process.

2. condenser exhaust steam residual heat as claimed in claim 1 reclaims energy saver, it is characterized in that: little indirect cool tower branch road is provided with circulating water flow and regulates hydraulic butterfly valve, in order to regulate little indirect cool tower flow.

3. condenser exhaust steam residual heat as claimed in claim 1 reclaims energy saver, it is characterized in that: little indirect cool tower has two kinds of forms, one is that direct circulation water branch road causes fans entrance, directly sets up the heat exchanger of corresponding heat-exchanging tube bundle at primary air fan, air blower inlet, for same air heat-exchange; One is that heat-exchanging tube bundle is set up, i.e. small-sized indirect cooling tower in bottom, and First air, Secondary Air entrance are arranged on circular tube bank top, draw the hot blast after heat exchange from top.

4. condenser exhaust steam residual heat as claimed in claim 1 reclaims energy saver, it is characterized in that: two and above unit can public small-sized indirect cool towers.

5. utilize condenser exhaust steam residual heat as claimed in claim 1 to reclaim the power-economizing method of energy saver, it is characterized in that comprising the following steps:

1) when spring, autumn, summer level are run, circulating water flow is regulated by regulating hydraulic butterfly valve, the return water temperature after little indirect cool tower circulation is made to ask close to cooling-tower circulating water backwater water temperature, if this device can be stopped transport when environment temperature is close with cooling-tower circulating water return water temperature during summer operation;

2) when running in the winter time, under the prerequisite guaranteeing unit safety operation, the pressure that power plant steam turbine runs exhaust back pressure is suitably improved; thus raising circulating water temperature; regulate hydraulic butterfly valve to regulate circulating water flow, prevent indirect cool tower bursting by freezing, now also relatively improve fans entrance wind-warm syndrome.