CN217872959U - Deep waste heat utilization device for high-back-pressure operation generator set - Google Patents
Deep waste heat utilization device for high-back-pressure operation generator set Download PDFInfo
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Abstract
The utility model belongs to the technical field of the electricity generation waste heat utilization, concrete technical scheme is: the utility model provides a high backpressure operation generating set degree of depth waste heat utilization equipment, steam supply comes from little quick-witted high/intermediate pressure jar and low pressure cylinder boundary department, get into little steam turbine and do work after the joint admission flow control valve of little steam turbine main steam, little steam turbine exhaust gets into the high back pressure condenser of second together with unit exhaust steam, little steam turbine exhaust steam is after the high back pressure condenser cooling of second, its drainage is stepped up to the low system that adds of unit through the drain pump, heating network circulating water return water gets into the high back pressure condenser secondary heating of second after the first high back pressure heating network condenser primary heating, the part that the temperature is not enough supplies to the heating network by the last heating of peak heater, the utility model discloses can make full use of the pressure differential energy between heating extraction pressure and the heating network condenser admission pressure during winter heat supply, adopt the asynchronous machine of merit steam turbine to generate electricity, reduce the power consumption rate of whole factory, realize energy saving and dragging consumption reduction.
Description
Technical Field
The utility model belongs to the technical field of the waste heat utilization of generating electricity, concretely relates to utilize heat supply steam extraction bypass to add degree of depth waste heat utilization equipment of xiao ji.
Background
The main technologies for deep utilization of waste heat of the high-back-pressure operation steam turbine comprise: 1. a high back pressure + lithium bromide high temperature absorption heat pump; 2. high back pressure + steam press; 3. a gradient high back pressure and a steam compressor set and the like; the operation characteristics of each waste heat utilization mode are respectively as follows:
1. the common lithium bromide absorption heat pump unit recovers the waste heat of the unit exhaust steam to raise the water temperature of the heat supply network by about 40 ℃, the energy efficiency ratio can reach 1.75-2, the system is applied to a single-stage high back heat supply system and a heat supply network circulation water volume deficiency system, but no obvious economic benefit exists in the operation of the heat supply in the early and final cold periods.
2. The main principle of the steam compressor (also called steam jet heat pump) technology is as follows: the high-pressure steam flows at a high speed through the nozzle, the low-pressure steam is compressed while expanding, the grade of the low-pressure steam is improved, and then the low-pressure steam is mixed through the mixing chamber, so that the low-grade dead steam energy of the unit is fully recovered, and the high-pressure steam mixing device has high economical efficiency; however, the technology has the defects that the isentropic efficiency is low, generally about 25%, the heating time interval when the water supply temperature of a heat supply network is low, and the system application effect is poor.
3. A stepped high back pressure + vapor compressor unit: the working principle of the steam recovery device is similar to that of an air blower, the saturation temperature of steam is increased by increasing steam pressure, and the aim of high-level recovery of low-grade steam waste heat is achieved. The mode is that when the recovery amount of the dead steam is fixed, the running backpressure of the unit can be reduced by increasing a certain electric power, and the running economy of the unit is improved; the defects are that the energy efficiency is higher when the heating is carried out by adopting small temperature rise and descending steps, but the number of compressors is more, and the system arrangement is more complicated.
SUMMERY OF THE UTILITY MODEL
For solving the technical problem that prior art exists, the utility model provides an utilize heat supply steam extraction bypass to add degree of depth waste heat utilization equipment of xiao ji, especially when the unit is located high back pressure heat supply operating mode operation, when row's heat supply steam extraction has certain surplus steam volume in the unit, adopt the mode of addding the operation of the xiao ji of heat supply steam extraction bypass, row's steam extraction energy drive xiao ji does work in the utilization, xiao ji steam extraction is arranged to the heat supply network condenser, utilize behind the work application waste heat heating heat supply network circulating water system, its electrical system inserts the unit power system of mill, can reduce the unit power consumption during the heat supply.
In order to achieve the above object, the utility model adopts the following technical scheme: a deep waste heat utilization device of a high-back-pressure operation generator set comprises a steam turbine air supply/exhaust device, a steam turbine drainage device and a heat supply network circulating water device;
the steam turbine air supply/exhaust device comprises a low-pressure cylinder and a high/medium-pressure cylinder, an air outlet of the low-pressure cylinder is communicated with an air inlet of an air-conditioning valve through a pipeline, an air outlet of the air-conditioning valve is communicated with an air inlet of the power and heat turbine through a pipeline, an air outlet of the power and heat turbine is communicated with an air inlet end of a second high-backpressure condenser through a pipeline, an air outlet of the low-pressure cylinder is communicated with an air inlet of an exhaust device through a pipeline, an air outlet of the exhaust device is communicated with an air inlet of an air cooling island through a pipeline, and an air outlet of the exhaust device is communicated with an air inlet end of the second high-backpressure condenser through a pipeline.
The steam turbine drainage device comprises a drainage pump, a water outlet of the second high back pressure condenser is communicated with a water inlet of the drainage pump through a pipeline, and a water delivery port of the drainage pump is communicated with the low-pressure heater through a pipeline.
The heat supply network circulating water device comprises a first high-backpressure condenser, a water return end of the heat supply network is communicated with a water inlet of the first high-backpressure condenser through a pipeline, a water outlet of the first high-backpressure condenser is communicated with a water inlet of a second high-backpressure condenser through a pipeline, a water outlet of the second high-backpressure condenser is communicated with a water inlet of a peak heater through a pipeline, a water outlet of the peak heater is communicated with a water outlet end of the heat supply network through a pipeline, and a gas outlet of a low-pressure cylinder and a gas outlet of a high/medium-pressure cylinder are also communicated with a water inlet of the peak heater through a pipeline.
And the second high back pressure condenser is also connected with a water ring vacuum pump.
Compared with the prior art, the utility model, specifically beneficial effect is embodied in: in the middle and cold periods of heat supply, when the water supply temperature of the heat supply network exceeds the range of the high-backpressure water outlet temperature, the energy level difference between the heat supply extraction steam and the medium-temperature heat supply network water can be fully recycled by utilizing the small power heat level of the steam extraction bypass to generate electricity, the power supply capacity of a unit can be increased under a certain heat supply amount, the coal consumption in the heat supply period can be reduced by 6.1g/kwh and the weighted annual coal consumption can be reduced by 2.7g/kwh according to the calculation of boundary conditions. Through measurement and calculation, the project recovery period is about 3 years, and the method has good economic benefit and popularization value.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure, 1 is a low-pressure cylinder, 2 is a high/medium-pressure cylinder, 3 is an air-adjusting valve, 4 is a power-heating turbine, 5 is a second high back-pressure condenser, 6 is an exhaust device, 7 is an air cooling island, 8 is a drain pump, 9 is a low-pressure heater, 10 is a first high back-pressure condenser, 11 is a heat supply network water return end, 12 is a peak heater, 13 is a heat supply network water outlet end, and 14 is a water ring vacuum pump.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the deep waste heat utilization device for the high back pressure operation generator set comprises a steam turbine air supply/exhaust device, a steam turbine water drainage device and a heat supply network circulating water device.
The steam turbine air supply/exhaust device comprises a low-pressure cylinder 1 and a high/medium-pressure cylinder 2, air supply comes from the boundary position of the small steam turbine high/medium-pressure cylinder 2 and the low-pressure cylinder 1, the high/medium-pressure cylinder 2 and the low-pressure cylinder 1 are combined through main steam of the small steam turbine and then enter an air-conditioning valve 3, the combined main steam enters a power-heating steam turbine 4 through the air-conditioning valve 3 to do work, the power-heating steam turbine 4 and exhaust steam of a unit exhaust device 6 enter a second high-backpressure condenser 5 together, an exhaust port of the exhaust device 6 is also communicated with an air cooling island 7, and the air cooling island 7 serves as a cooler to cool high-temperature steam, so that the operation safety is guaranteed.
The work heat turbine 4 is supplied with air from the steam extraction heat supply pipeline of the two main machines, so that the mode that the single main machine supplies the single work heat turbine 4, and one main machine can supply the two work heat turbines 4 or the two main machines supply the two work heat turbines 4 can be realized.
The power heating steam turbine 4 adopts an upper steam discharging mode, steam supply enters the power heating steam turbine 4 through a main steam valve and a speed regulating steam valve of the power heating steam turbine 4, the rotating speed and the load of the steam turbine are regulated by the speed regulating steam valve, the power heating steam turbine 4 adopts an upper steam discharging mode, the steam discharging is carried out to the second high back pressure steam condenser 5, and a butterfly valve is additionally arranged on a steam supply pipe of the original host machine which enters the second high back pressure steam condenser 5 in a high back pressure mode to carry out isolation and switching.
The temperature of the power and heat turbine 4 is high, and the arrangement height of the power and heat turbine 4 is required to ensure that the drain water of the body and the exhaust system of the power and heat turbine 4 can return to the second high back pressure condenser 5 or the unit exhaust device 6. In the steam turbine drainage device, exhaust of a power and heat steam turbine 4 is cooled by a second high back pressure condenser 5, drainage of the second high back pressure condenser 5 is boosted by a drainage pump 8 and then returned to a low pressure heater 9 of a unit, and gradient utilization of drainage heat is achieved.
Considering the influence of the exhaust of the power and heat turbine 4 on the original unit vacuum pumping system, a set of special water ring vacuum pump 14 is additionally arranged, and the water ring vacuum pump 14 is connected with the second high back pressure condenser 5, so that the maximum utilization of the exhaust steam of the unit is ensured.
The heat supply network circulating water device comprises a first high back pressure condenser 10, a heat supply network circulating water end 11 is communicated with a water inlet of the first high back pressure condenser 10 through a pipeline, heat supply network circulating water backwater enters a second high back pressure condenser 5 for secondary heating after being heated by the first high back pressure condenser, mixed steam of an air outlet of the low-pressure air cylinder 1 and the high/medium-pressure air cylinder 2 is directly input into the peak heater 12 through the pipeline, and when the temperature is insufficient, the mixed steam is finally heated by the peak heater 12 and then is supplied to the heat supply network.
The utility model provides a high back pressure running generator unit degree of depth waste heat utilization equipment, because high-quality steam is through newly-increased little turbo generator set work back, new steam reduces at former big turbo generator set work, and newly-increased little turbo generator set work efficiency is lower, and whole steam supply economic nature is poor. The utility model can fully utilize the pressure difference energy between the heating steam extraction pressure and the steam inlet pressure of the heat supply network condenser during the heat supply in winter, and adopts the power and heat steam turbine 4 to drive the asynchronous motor to generate electricity, thereby reducing the plant power rate of the whole plant and realizing energy conservation and consumption reduction; the exhaust steam of the steam turbine can completely heat the circulating water of the heat supply network, and the system can fully utilize the residual pressure potential energy of the steam, realize the gradient utilization of the extracted steam energy, increase the heat supply capacity and reduce the heat supply cost.
The foregoing is considered as illustrative and exemplary embodiments of the invention, and is not to be construed as limiting the invention, which is intended to be broadly construed as the invention in any manner, including any variations, equivalents and modifications within the spirit and scope of the invention.
Claims (3)
1. A deep waste heat utilization device of a high-back-pressure operation generator set is characterized by comprising a steam turbine air supply/exhaust device, a steam turbine drainage device and a heat supply network circulating water device;
the steam turbine air supply/exhaust device comprises a low-pressure cylinder (1) and a high/medium-pressure cylinder (2), wherein an air outlet of the low-pressure cylinder (1) is communicated with an air outlet of the high/medium-pressure cylinder (2) through a pipeline and an air inlet of an air-conditioning valve (3), an air outlet of the air-conditioning valve (3) is communicated with an air inlet of a power and heat steam turbine (4) through a pipeline, an air outlet of the power and heat steam turbine (4) is communicated with an air inlet end of a second high-backpressure condenser (5) through a pipeline, an air outlet of the low-pressure cylinder (1) is also communicated with an air inlet of an exhaust device (6) through a pipeline, an exhaust port of the exhaust device (6) is communicated with an air inlet of an air cooling island (7) through a pipeline, and an exhaust port of the exhaust device (6) is also communicated with an air inlet end of the second high-backpressure condenser (5) through a pipeline;
the steam turbine drainage device comprises a drainage pump (8), a water outlet of the second high back pressure condenser (5) is communicated with a water inlet of the drainage pump (8) through a pipeline, and a water delivery port of the drainage pump (8) is communicated with the low-pressure heater (9) through a pipeline;
the heat supply network circulating water device comprises a first high-back-pressure condenser (10), a heat supply network water return end (11) is communicated with a water inlet of the first high-back-pressure condenser (10) through a pipeline, a water outlet of the first high-back-pressure condenser (10) is communicated with a water inlet of a second high-back-pressure condenser (5) through a pipeline, a water outlet of the second high-back-pressure condenser (5) is communicated with a water inlet of a peak heater (12) through a pipeline, and a water outlet of the peak heater (12) is communicated with a water outlet end (13) of the heat supply network through a pipeline.
2. The deep waste heat utilization device of the high back pressure running generator set according to claim 1, characterized in that the air outlet of the low pressure cylinder (1) and the air outlet of the high/medium pressure cylinder (2) are also communicated with the water inlet of the spike heater (12) through a pipeline.
3. The deep waste heat utilization device of the high-back-pressure operation generator set according to claim 1, characterized in that a water ring vacuum pump (14) is further connected to the second high-back-pressure condenser (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222476669.0U CN217872959U (en) | 2022-09-19 | 2022-09-19 | Deep waste heat utilization device for high-back-pressure operation generator set |
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| CN202222476669.0U CN217872959U (en) | 2022-09-19 | 2022-09-19 | Deep waste heat utilization device for high-back-pressure operation generator set |
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