CN210688179U - Boiler high-pressure water supply system applied to biomass cogeneration unit - Google Patents
Boiler high-pressure water supply system applied to biomass cogeneration unit Download PDFInfo
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- CN210688179U CN210688179U CN201921294280.6U CN201921294280U CN210688179U CN 210688179 U CN210688179 U CN 210688179U CN 201921294280 U CN201921294280 U CN 201921294280U CN 210688179 U CN210688179 U CN 210688179U
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Abstract
The utility model provides a be applied to boiler high pressure water supply system of living beings combined heat and power generation unit, including the oxygen-eliminating device, driving motor, first boiler feed pump, second boiler feed pump, main steam turbine, little steam turbine of back pressure type and boiler. Through the utility model provides a be applied to boiler high pressure water supply system of living beings combined heat and power generation unit can obtain make full use of power plant's steam resource and replace original power consumption, and after steam passed through back pressure type drive steam turbine and does work, the secondary was recycled, promotes the operation economic benefits of unit, increases beneficial effect such as heat supply load.
Description
Technical Field
The utility model relates to a be applied to boiler high pressure water supply system of living beings combined heat and power generation unit.
Background
In a small-sized power generating set (the power generating set with a single unit capacity below 125MW is small according to the specified design specification of GB50049-2011 small-sized thermal power plant), particularly in a garbage and biomass power generating set, the direct connection of a motor and a boiler feed pump is adopted to boost the low-pressure feed water of the system, so that three problems are caused:
the electricity used for driving the motor of the water feeding pump is the electricity generated by the generator, and the direct electricity driving economical efficiency is poor due to the fact that the electricity price ratio of the biomass and garbage power plant to the internet is high.
The electric motor uses electricity, meaning that the total amount of electricity delivered to the grid is reduced.
In order to achieve the purpose of energy conservation, the motor is configured with a frequency converter, and the frequency converter is expensive and has low return rate of investment.
Specifically, taking a water supply system of a biomass 30MW generator set as an example, the existing power plant is configured with two electric water supply pumps, namely a boiler water supply pump 1 and a boiler water supply pump 2, wherein the boiler water supply pump 2 is a standby pump and is used as an emergency pump when the boiler water supply pump 1 breaks down suddenly or the two pumps run alternately at regular intervals. The boiler feed water pump 1 is driven by a drive motor 1, the boiler feed water pump 2 is driven by a drive motor 2, and the drive motors 1 and 2 use service power as power sources. The two driving motors are provided with frequency converters. When the unit operates, the driving motor 1 drives the boiler feed water pump 1 to work, low-pressure feed water supplied by the deaerator enters the inlet of the boiler feed water pump 1, the pressure is boosted through the boiler feed water pump 1, and high-pressure feed water flows out of the outlet of the boiler feed water pump 1 to the boiler. When the boiler feed pump 1 is normally operated, the boiler feed pump 2 is not operated as a backup pump. The two feed pumps work alternately at regular intervals.
Because the motor that drives boiler feed pump drives with the electricity, main steam promotes the steam turbine and drags the generator and generate electricity to in the power generation process, steam is converted into electricity and is had conversion rate and energy loss of certain proportion, and when online unit price of electricity was greater than 0.4 yuan, the electricity economy started to weaken, and 30MW biomass power generation generally surfs the net unit price of electricity at 0.75 yuan, and the economic nature is more inferior. The driving motor of the boiler feed pump of the 30MW biomass unit is 1000KW (the motor of the unit is usually 1000-1250 KW for convenient calculation and 1000KW is selected), the purpose is that the electric quantity generated by the generator is 1000KW for the driving motor 1, but the electricity consumption in the factory is increased by 3.3%, the electricity price on the internet is calculated according to 0.75 yuan/kwh, the income of the external power supply is reduced by 750 yuan/h, the annual utilization hours is calculated according to 7500 h, and the value of the externally-supplied electric quantity which is less than the annual utilization hours is 562.5 ten thousand. The frequency converter of the driving motor is also a millions of investment. Therefore, in summary, the 30MW biomass generator set directly uses the motor to drive the feed pump, which has obvious disadvantage in economic efficiency.
Therefore, to the characteristics of above-mentioned small-size living beings combined heat and power units generating capacity is little, the price of electricity is high on the net, external heat supply, how to provide a boiler high pressure water supply system who is applied to small-size living beings combined heat and power units, satisfying under the operating mode condition of power plant, make full use of power plant's steam resource replaces original power consumption, after steam passes through back pressure type drive steam turbine and does work, the secondary recycles, promote the operation economic benefits of unit, increase the heat supply capacity, it has become the problem of waiting to solve urgently to improve the external total amount of generating electricity of power plant.
Disclosure of Invention
The utility model provides a boiler high-pressure water supply system applied to biomass cogeneration units, aiming at the defects of the prior art, the system comprises a deaerator, a high-pressure frequency converter, a driving motor, a first boiler water supply pump, a second boiler water supply pump, a main turbine, a back pressure type small turbine and a boiler; wherein the content of the first and second substances,
the deaerator is connected with the first boiler feed water pump and the second boiler feed water pump respectively;
one end of the driving motor is connected with a power supply, the other end of the driving motor is connected with the first boiler water-feeding pump through a first coupler, the driving motor drives the first boiler water-feeding pump, low-pressure water flowing into the first boiler water-feeding pump from the deaerator is boosted to high-pressure water meeting working condition requirements, the high-pressure water is introduced into the boiler, and the boiler generates steam through heating;
the main steam turbine introduces the steam into the small back-pressure steam turbine, the small back-pressure steam turbine is driven by the steam to do work, and the temperature and the pressure of the steam are reduced to meet the heat supply condition after the steam does work and heat is supplied to the outside through a heat supply pipeline;
the small back-pressure turbine is connected with the second boiler water-feeding pump through a second coupling, drives the second boiler water-feeding pump, boosts low-pressure water flowing into the second boiler water-feeding pump from the deaerator to high-pressure water meeting working condition requirements, and introduces the high-pressure water into the boiler.
Preferably, the first regulating valve is arranged in front of an inlet of the small back pressure turbine, and the first regulating valve is used for regulating the steam inlet amount entering the small back pressure turbine, so that the second boiler feed water pump is controlled by controlling the rotating speed of the small back pressure turbine.
Preferably, the second regulating valve is arranged on the heat supply pipeline of the back pressure type small steam turbine and used for regulating the heat supply amount.
Preferably, the steam extraction system of the main steam turbine is divided into two paths, one path is used for meeting the heat source requirement of the original system, and the other path is used as a bypass system for introducing the steam into the small back-pressure steam turbine.
Preferably, the power of the first boiler feed water pump is gradually reduced, the power of the second boiler feed water pump is gradually increased in an equal amount, and when the power of the first boiler feed water pump is zero, the boiler high-pressure water supply system applied to the small generator set is changed from an electric driving mode to a full steam-driven mode.
Preferably, a high voltage inverter is provided between the driving motor and the power supply.
Preferably, a speed regulating device is provided between the drive motor and the first boiler feed water pump.
Preferably, the boiler high-pressure water supply system is applied to a fan, and the fan is a blower, an induced draft fan, a primary fan or a secondary fan.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. through the utility model provides a be applied to boiler high pressure water supply system of living beings combined heat and power unit can solve the difficult problem that small-size back pressure thermoelectric generator set electricity generation steam turbine has unnecessary admission well, lets unnecessary vapour volume produce economic benefits.
2. The utility model provides a be applied to boiler high pressure water supply system of living beings combined heat and power generation unit can promote the economic nature of the unit energy, also for reducing the energy consumption, reduces and pollutes and provides an effectual approach.
3. The utility model provides a be applied to boiler high pressure water supply system of living beings cogeneration unit can realize that back pressure cogeneration unit carries more electric quantity to go into the purpose of electric wire netting.
4. The utility model provides a be applied to boiler high pressure water supply system of living beings cogeneration unit can be fine must solve the problem that small-size back pressure cogeneration unit reduces the station service power.
Drawings
Fig. 1 is a schematic diagram of a boiler high-pressure water supply system applied to a biomass cogeneration unit.
The system comprises a deaerator 1, a high-voltage frequency converter 2, a driving motor 3, a first boiler feed water pump 4, a second boiler feed water pump 5, a main turbine 6, a back pressure type small turbine 7, a boiler 8, a first regulating valve 9 and a second regulating valve 10.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
As shown in fig. 1, the utility model provides a boiler high-pressure water supply system applied to biomass cogeneration unit, which is characterized in that the system comprises a deaerator 1, a high-pressure frequency converter 2, a driving motor 3, a first boiler water supply pump 4, a second boiler water supply pump 5, a main turbine 6, a back pressure type small turbine 7 and a boiler 8; the deaerator 1 is connected with the first boiler feed water pump 4 and the second boiler feed water pump 5 respectively; one end of the driving motor 3 is connected with a power supply, the other end of the driving motor is connected with the first boiler water-feeding pump 4 through a first coupler, the driving motor 3 drives the first boiler water-feeding pump 4 to boost the low-pressure water flowing into the first boiler water-feeding pump 4 from the deaerator 1 to high-pressure water meeting the working condition requirement, the high-pressure water is introduced into the boiler 8, and the boiler 8 generates steam through heating; the main steam turbine 6 introduces the steam into the small back-pressure steam turbine 7, the small back-pressure steam turbine 7 is driven by the steam to do work, and the temperature and the pressure of the steam are reduced to meet the heat supply condition after the steam does work and heat is supplied to the outside through a heat supply pipeline; the small back-pressure turbine 7 is connected with the second boiler feed pump 5 through a second coupling, the small back-pressure turbine 7 drives the second boiler feed pump 5 to boost the low-pressure water flowing into the second boiler feed pump 5 from the deaerator 1 to high-pressure water meeting working condition requirements, and the high-pressure water is introduced into the boiler 8.
Through the utility model provides a pair of be applied to boiler high pressure water supply system of living beings cogeneration unit can greatly improve small-size cogeneration unit economic benefits. Specifically, taking a 30MW biomass generating set as an example, two 100% electric boiler water feeding pumps are conventionally configured, the configured electric motors are 1000KW, the actual power of the water feeding pumps is 850KW, steam is pumped into a back pressure turbine, the first pumping temperature is 335 ℃, the pressure is 2.18MPa, the corresponding enthalpy value is 3101.5kj/kg, the back pressure heat supply parameter temperature of the back pressure turbine is 180 ℃, the pressure is 0.5MPa, and the corresponding enthalpy value is 2811.7 kj/kg. Boiler efficiency 91% and fuel calorific value 2500 Kcal.
Suppose the utility model provides a boiler high pressure water supply system is applied to this power plant, and biomass power plant's annual equivalent utilizes the hour generally to be 7500 hours, according to the electricity price of its upper net 0.75 yuan/kwh meter, reforms transform boiler feed pump system operation the utility model provides a boiler high pressure water supply system is unified year produced benefit as follows:
before use, the hourly electricity consumption of the boiler feed pump is as follows: 850Kwh, the value of electricity per hour is 850Kwh x 0.75 yuan/Kwh =637.5 yuan. The electricity charge is saved all the year round: 637.5 yuan/hour × 7500 hour =478.1 ten thousand yuan.
After the boiler water feeding pump is used, the boiler water feeding pump is changed from electric drive to steam drive, the steam extracted by the first-stage steam extraction of the steam turbine needs to be increased by 19.5t/h, and the tonnage of fuel consumed per hour is X:
x = (3101.5-2811.7) × 19.5/0.91/2500/4.1868=0.59 (ton)
The biomass fuel is calculated by 300 yuan per ton, and the cost is increased by 300 multiplied by 0.59=177 yuan per hour. The annual new fuel cost is 177 × 7500=132.8 ten thousand yuan. If respectively join in marriage one set of high-voltage inverter for 2 electronic feed-water pumps, use the utility model provides a boiler high-pressure water supply system can reduce one set of high-voltage inverter and high tension switchgear to and relevant cable, total value is about 100 ten thousand.
In summary, the following steps: use the utility model provides a boiler high pressure water supply system realizes 345.3 ten thousand yuan benefit and reduces 100 ten thousand earlier stage for this power plant for the whole year actually. Can know by above-mentioned economy calculating, use the utility model provides a be applied to boiler high pressure water supply system of living beings combined heat and power generation unit can produce huge economic benefits.
Preferably, the first regulating valve 9 is provided in front of an inlet of the back pressure small turbine 7, and the first regulating valve 9 is used for regulating the amount of steam entering the back pressure small turbine 7, so that the second boiler feed water pump 5 is controlled by controlling the rotation speed of the back pressure small turbine 7.
Preferably, the second regulating valve 10 is arranged on the heat supply pipeline of the back pressure type small steam turbine 7, and the second regulating valve 10 is used for regulating the heat supply amount.
Preferably, the steam extraction system of the main turbine 6 is divided into two paths, one path is used for meeting the heat source requirement of the original system, and the other path is used as a bypass system for introducing the steam into the small back-pressure turbine 7.
Preferably, the power of the first boiler feed water pump 4 is gradually reduced, the power of the second boiler feed water pump 5 is gradually increased in equal amount, and when the power of the first boiler feed water pump 4 becomes zero, the boiler high-pressure water supply system applied to the small-sized generator set is changed from an electric driving mode to a full steam-driven mode.
Preferably, a high voltage inverter 2 is provided between the driving motor 3 and the power supply.
Preferably, a speed regulating device is provided between the drive motor 3 and the first boiler feed water pump 4.
Preferably, the boiler high-pressure water supply system is applied to a fan, and the fan is a blower, an induced draft fan, a primary fan or a secondary fan.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. through the utility model provides a be applied to boiler high pressure water supply system of living beings combined heat and power unit can solve the difficult problem that small-size back pressure thermoelectric generator set electricity generation steam turbine has unnecessary admission well, lets unnecessary vapour volume produce economic benefits.
2. The utility model provides a be applied to boiler high pressure water supply system of living beings combined heat and power generation unit can promote the economic nature of the unit energy, also for reducing the energy consumption, reduces and pollutes and provides an effectual approach.
3. The utility model provides a be applied to boiler high pressure water supply system of living beings cogeneration unit can realize that back pressure cogeneration unit carries more electric quantity to go into the purpose of electric wire netting.
4. The utility model provides a be applied to boiler high pressure water supply system of living beings cogeneration unit can be fine must solve the problem that small-size back pressure cogeneration unit reduces the station service power.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It will be apparent to those skilled in the art that various changes and modifications may be made to the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. A boiler high-pressure water supply system applied to a biomass cogeneration unit is characterized by comprising a deaerator, a driving motor, a first boiler water supply pump, a second boiler water supply pump, a main turbine, a back pressure type small turbine and a boiler; wherein the content of the first and second substances,
the deaerator is connected with the first boiler feed water pump and the second boiler feed water pump respectively;
one end of the driving motor is connected with a power supply, the other end of the driving motor is connected with the first boiler water-feeding pump through a first coupler, the driving motor drives the first boiler water-feeding pump, low-pressure water flowing into the first boiler water-feeding pump from the deaerator is boosted to high-pressure water meeting working condition requirements, the high-pressure water is introduced into the boiler, and the boiler generates steam through heating;
the main steam turbine introduces the steam into the small back-pressure steam turbine, the small back-pressure steam turbine is driven by the steam to do work, and the temperature and the pressure of the steam are reduced to meet the heat supply condition after the steam does work and heat is supplied to the outside through a heat supply pipeline;
the small back-pressure turbine is connected with the second boiler water-feeding pump through a second coupling, drives the second boiler water-feeding pump, boosts the low-pressure water flowing into the second boiler water-feeding pump from the deaerator to high-pressure water meeting working condition requirements, and introduces the high-pressure water into the boiler.
2. The boiler high-pressure water supply system applied to the biomass cogeneration unit according to claim 1, wherein a first regulating valve is provided in front of an inlet of the small back-pressure turbine, and the first regulating valve is used for regulating the amount of steam entering the small back-pressure turbine, so that the second boiler water supply pump is controlled by controlling the rotating speed of the small back-pressure turbine.
3. The boiler high-pressure water supply system applied to the biomass cogeneration unit according to claim 1, wherein a second regulating valve is provided on the heat supply pipeline of the small back pressure turbine, and the second regulating valve is used for regulating the heat supply amount.
4. The boiler high-pressure water supply system applied to the biomass cogeneration unit according to claim 1, wherein the steam extraction system of the main turbine is divided into two paths, one path is used for meeting the heat source requirement of the original system, and the other path is used as a bypass system for introducing the steam into the small back-pressure turbine.
5. The boiler high-pressure water supply system applied to the biomass cogeneration unit of claim 1, wherein the power of the first boiler water supply pump is gradually reduced, the power of the second boiler water supply pump is gradually increased in equal amount, and when the power of the first boiler water supply pump is zero, the boiler high-pressure water supply system applied to the small-sized power generating unit is changed from an electric driving mode to a full pneumatic dragging mode.
6. The boiler high-pressure water supply system applied to a biomass cogeneration unit according to claim 1, wherein a high-pressure inverter is provided between the driving motor and the power supply.
7. The boiler high-pressure water supply system applied to the biomass cogeneration unit according to claim 1, wherein a speed regulating device is arranged between the driving motor and the first boiler water supply pump.
8. The boiler high-pressure water supply system applied to the biomass cogeneration unit according to claim 1, wherein the boiler high-pressure water supply system is applied to a fan.
9. The boiler high-pressure water supply system applied to the biomass cogeneration unit according to claim 1, wherein the biomass cogeneration unit is a small-sized generator unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921294280.6U CN210688179U (en) | 2019-08-12 | 2019-08-12 | Boiler high-pressure water supply system applied to biomass cogeneration unit |
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| CN201921294280.6U CN210688179U (en) | 2019-08-12 | 2019-08-12 | Boiler high-pressure water supply system applied to biomass cogeneration unit |
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