阅读说明：本技术 一种可实现全年投运的采暖背压机发电系统 (Heating back pressure machine power generation system capable of achieving annual commissioning ) 是由 杨利 马汀山 余小兵 曾立飞 井新经 王春燕 王伟 王东晔 郑天帅 刘学亮 于 2021-09-18 设计创作，主要内容包括：本发明公开了一种可实现全年投运的采暖背压机发电系统,包括背压机、辅汽联箱、供热首站、给水泵汽轮机、凝汽器、给水泵及三通阀；小机主蒸汽管道与背压机的入口相连通,背压机的排汽口与三通阀的第一开口相连通,三通阀的第二开口与辅汽联箱的入口相连通,辅汽联箱的出口与给水泵汽轮机的入口相连通,给水泵汽轮机的出口与凝汽器的入口相连通,三通阀的第三开口与供热首站的入口相连通,该系统能够在非采暖季对背压机的乏汽进行消纳及利用,实现背压机发电系统的全年投运。(The invention discloses a heating back pressure machine power generation system capable of realizing annual operation, which comprises a back pressure machine, an auxiliary steam header, a heat supply initial station, a water supply pump turbine, a condenser, a water supply pump and a three-way valve, wherein the back pressure machine is connected with the steam supply header; the small machine main steam pipeline is communicated with an inlet of the back pressure machine, a steam outlet of the back pressure machine is communicated with a first opening of a three-way valve, a second opening of the three-way valve is communicated with an inlet of an auxiliary steam header, an outlet of the auxiliary steam header is communicated with an inlet of a water feeding pump turbine, an outlet of the water feeding pump turbine is communicated with an inlet of a condenser, and a third opening of the three-way valve is communicated with an inlet of a heat supply initial station.)

1. A heating back pressure machine power generation system capable of achieving annual operation is characterized by comprising a back pressure machine (1), an auxiliary steam header (3), a heat supply initial station (4), a water supply pump turbine (5), a condenser (6), a water supply pump (7) and a three-way valve;

the small machine main steam pipeline is communicated with an inlet of the back press machine (1), a steam exhaust port of the back press machine (1) is communicated with a first opening of a three-way valve, a second opening of the three-way valve is communicated with an inlet of an auxiliary steam header (3), an outlet of the auxiliary steam header (3) is communicated with an inlet of a water feeding pump turbine (5), an outlet of the water feeding pump turbine (5) is communicated with an inlet of a condenser (6), and a third opening of the three-way valve is communicated with an inlet of a heat supply initial station (4).

2. The heating backpressure machine power generation system capable of achieving annual commissioning as claimed in claim 1, wherein the second opening of the three-way valve is communicated with the inlet of the auxiliary steam header (3) through a first electric isolation valve and a first check valve.

3. The heating back pressure machine power generation system capable of achieving annual commissioning according to claim 2, wherein an outlet of the auxiliary steam header (3) is communicated with an inlet of the water feeding pump turbine (5) through a pneumatic gate valve, a pneumatic check valve and a second electric isolation valve in sequence.

4. The heating back pressure machine power generation system capable of achieving annual operation according to claim 1, wherein a drainage outlet of a condenser (6) is communicated with a small machine condensate system through a booster pump.

5. The heating backpressure machine power generation system capable of achieving annual commissioning according to claim 3, wherein a third opening of the three-way valve is communicated with an inlet of the heat supply primary station (4) through a third electric isolation valve and a second check valve.

6. The heating back pressure machine power generation system capable of achieving annual commissioning according to claim 1, wherein the back pressure machine (1) is connected with a generator (2).

7. The heating back pressure machine power generation system capable of realizing annual operation according to claim 1, wherein a feed water pump turbine (5) is connected with a drive shaft of a feed water pump (7).

8. The heating back pressure machine power generation system capable of achieving annual commissioning according to claim 1, wherein a drain outlet of a condenser (6) and a drain port of a heating head station (4) are both communicated with a small machine condensate system.

Technical Field

The invention belongs to the technical field of comprehensive utilization of heat energy, and relates to a heating back pressure machine power generation system capable of realizing annual operation.

Background

In the field of heating and heat supply of residents, when the steam extraction parameter of a unit is higher than the steam parameter required by external supply, the pressure of the extracted steam is often required to be reduced. The steam extraction throttling loss is a common problem in heat supply, the corresponding energy-saving potential is very large, and the problem is more prominent when the unit is required to have a wide-load operation condition under the background of deep peak shaving of the thermal power unit. If effective measures can be taken to reasonably utilize the part of energy, the heat supply economy of the unit can be greatly improved.

At present, although more power plants develop the energy-saving research of heating steam through various means, for example, a heating steam residual pressure cascade utilization system is adopted, steam energy is reasonably and hierarchically utilized through a backpressure steam turbine generator set, and work-applying power generation is used for a belt splicing unit service system. However, in the non-heating period, the exhaust steam of the backpressure steam turbine generator unit cannot be consumed, and only can be idled and stopped, so that the utilization rate of equipment is low. If reasonable users can be found to consume the exhaust steam of the back pressure turbine, the annual commissioning of the back pressure turbine power generation system by cascade utilization can be realized, and the energy conservation and income creation of a power plant are very favorable.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a heating back pressure machine power generation system capable of realizing annual operation, which can absorb and utilize the exhaust steam of a back pressure machine in non-heating seasons and realize annual operation of the back pressure machine power generation system.

In order to achieve the purpose, the heating back pressure machine power generation system capable of being put into operation all the year round comprises a back pressure machine, an auxiliary steam header, a heat supply initial station, a water supply pump steam turbine, a condenser, a water supply pump and a three-way valve;

the small machine main steam pipeline is communicated with an inlet of the back press, a steam outlet of the back press is communicated with a first opening of a three-way valve, a second opening of the three-way valve is communicated with an inlet of an auxiliary steam header, an outlet of the auxiliary steam header is communicated with an inlet of a water feeding pump turbine, an outlet of the water feeding pump turbine is communicated with an inlet of a condenser, and a third opening of the three-way valve is communicated with an inlet of a heat supply initial station.

And a second opening of the three-way valve is communicated with an inlet of the auxiliary steam header through a first electric isolating valve and a first check valve.

And the outlet of the auxiliary steam header is communicated with the inlet of the water feeding pump turbine through a pneumatic gate valve, a pneumatic check valve and a second electric isolation valve in sequence.

And a drain outlet of the condenser is communicated with a small machine condensed water system through a booster pump.

And a third opening of the three-way valve is communicated with an inlet of the heat supply primary station through a third electric isolating valve and a second check valve.

The back press is connected with the generator.

The feed pump turbine is connected to a drive shaft of the feed pump.

The drain outlet of the condenser and the drain port of the heat supply initial station are communicated with a small machine condensed water system.

The invention has the following beneficial effects:

when the heating back pressure machine power generation system capable of realizing annual operation is in specific operation and operates in a heating season, exhausted steam of the back pressure machine enters a heat supply initial station, and hydrophobic water formed after heat exchange with circulating water of a heat supply network returns to a small machine condensed water system; when the back pressure machine operates in a non-heating season, the exhaust steam of the back pressure machine enters the auxiliary steam header to serve as a steam source of the auxiliary steam header, the exhaust steam of the back pressure machine is used for blowing, removing pins, removing dust, a fan heater of a large machine and a steam source of a water supply pump steam turbine through the auxiliary steam header, the exhaust steam of the water supply pump steam turbine is condensed by a condenser to form hydrophobic water and is sent into a small machine condensed water system, and when the back pressure machine breaks down or is shut down for maintenance, the steam supply mode of the original auxiliary steam header is recovered, so that the back pressure machine can operate safely and stably in the non-heating season, and the full-year operation of a back pressure machine power generation system is realized.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Wherein, 1 is a back pressure machine, 2 is a generator, 3 is an auxiliary steam header, 4 is a heat supply initial station, 5 is a water supply pump turbine, 6 is a condenser, and 7 is a water supply pump.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.

Referring to fig. 1, the heating back pressure machine power generation system capable of realizing annual operation according to the present invention includes a back pressure machine 1, a power generator 2, an auxiliary steam header 3, a heat supply primary station 4, a water supply pump turbine 5, a condenser 6, a water supply pump 7 and a three-way valve;

the small machine main steam pipeline is communicated with an inlet of the back pressure machine 1, a steam outlet of the back pressure machine 1 is communicated with a first opening of a three-way valve, a second opening of the three-way valve is communicated with an inlet of an auxiliary steam header 3 through a first electric isolation valve and a first check valve, an outlet of the auxiliary steam header 3 is communicated with an inlet of a water supply pump steam turbine 5 through a pneumatic gate valve, a pneumatic check valve and a second electric isolation valve in sequence, an outlet of the water supply pump steam turbine 5 is communicated with an inlet of a condenser 6, a drain outlet of the condenser 6 is communicated with a small machine condensate system through a booster pump, a third opening of the three-way valve is communicated with an inlet of a heat supply primary station 4 through a third electric isolation valve and a second check valve, a drain port of the heat supply primary station 4 is communicated with the small machine condensate system, the back pressure machine 1 is connected with the generator 2, and the water supply pump steam turbine 5 is connected with a driving shaft of a water supply pump 7.

When the back pressure machine works, the third electric isolating valve and the second check valve are closed when the back pressure machine operates in a non-heating season, the exhausted steam of the back pressure machine 1 is introduced into the auxiliary steam header 3 to serve as the steam demand for normal operation of the auxiliary steam header 3, and when the back pressure machine 1 breaks down or is stopped for maintenance, the original steam supply mode of the auxiliary steam header 3 is recovered.

Through the unit transformation and the switching of the steam flow, the purpose of putting the back press 1 into operation all the year around is achieved, the annual utilization hours of the back press 1 are increased, and the energy conservation and income creation are very favorable for a power plant.

Example one

Taking a 2 × 50MW high-temperature and high-pressure back press 1 and a 2 × 350MW supercritical cogeneration unit configured in a certain power plant as an example, the design steam discharge parameters of the back press 1 are 1.4MPa and 309.6 ℃, the current actual steam discharge pressure of heating of residents is about 1.0MPa, and the steam consumption requirement of a water supply pump 7 is about 21.2-99.6 t/h when the steam consumption requirement is above 50% THA operating condition. Through statistics, the steam consumption demand of the auxiliary steam header 3 is about 95t/h in non-heating seasons, so that the minimum steam consumption of the auxiliary steam header 3 is about 116.2t/h in non-heating seasons after the steam consumption demand of the water supply pump 7 is considered.

The rated steam inlet quantity of the back press 1 is 475t/h, the actual maximum operation is limited by a power grid, the maximum operation working condition is 90% of the rated load, the actual operation is limited by a boiler side, the minimum operation working condition is 30% of the rated load, the minimum rated steam inlet quantity of a single unit is 135t/h, and the steam exhaust quantity is 110t/h, so that the 110t/h steam exhaust quantity is required to be utilized in non-heating seasons. It can be seen that the steam demand of the auxiliary steam header 3 can meet the operating conditions of the back press 1.

According to the invention, through unit transformation and steam flow switching, the whole-year commissioning of the back press 1 in the heating season is realized, the annual utilization hours of the back press 1 are increased, and the profitability of a power plant is improved.

Taking the above-mentioned 50MW unit as an example, considering that the operation time of the back press 1 in the non-heating season is 4000h, the power coal consumption of the back press 1 is 140g/kwh, the unit price of the standard coal is 800 yuan/t, the price of the on-grid electricity is 0.29 yuan/kwh, and the power generation power of the back press 1 under 30% operation condition is 14.21MW, the calculation result is as follows:

in non-heating seasons, the total generated energy of the back press 1 is 56840MWh, the converted power generation benefit is 1648 ten thousand yuan, the coal consumption of the back press 1 is 7957.6t, the coal consumption cost is 637 ten thousand yuan, and the annual power generation net benefit is 1011 ten thousand yuan.

The engineering reconstruction investment of the invention is about 2400 ten thousand yuan, the investment recovery period is about 3 years, the system is simple, the investment recovery period is short, the investment risk is small, and the popularization value is high.