CN210638322U

CN210638322U - Waste heat refrigerating system of coal-fired power plant

Info

Publication number: CN210638322U
Application number: CN201920961919.5U
Authority: CN
Inventors: 苏靖程; 薛方明; 陈锋; 孙漪清; 刘秀如
Original assignee: Huadian Electric Power Research Institute Co Ltd
Current assignee: Huadian Electric Power Research Institute Co Ltd
Priority date: 2019-06-25
Filing date: 2019-06-25
Publication date: 2020-05-29
Anticipated expiration: 2029-06-25

Abstract

The utility model discloses a coal-fired power plant waste heat refrigerating system, which comprises a refrigerating unit, a variable-frequency cabin, a condensate tank, a steam mixing device, a safety valve, a stop valve, a pump, a three-way valve, a flowmeter, a pressure gauge, a filter, a first continuous discharge tank, a second continuous discharge tank, a thermometer, a first circulating water pipe, a second circulating water pipe, a first connecting pipe, a second connecting pipe, a third connecting pipe, a backflow pipe and a flow inlet pipe, wherein the refrigerating unit is connected with the steam mixing device through the first connecting pipe, the safety valve, the filter and the flowmeter are arranged on the first connecting pipe, the refrigerating unit is connected with the variable-frequency cabin through the third connecting pipe, the system has reasonable design, can reduce the power consumption of an air conditioning system of a power plant and reduce the power consumption rate of the plant while fully utilizing the waste heat to carry the potential energy of a working medium and realize the, has obvious economic and environmental protection benefits.

Description

Waste heat refrigerating system of coal-fired power plant

Technical Field

The utility model relates to a refrigeration field specifically is a coal fired power plant waste heat refrigerating system.

Background

The technology of 'drying and squeezing out' the waste heat carrying the energy of the working medium is widely applied to coal-fired power plants, the good benefit of deep energy saving is reflected, a thermoelectric company generates a large amount of extra steam every year, the steam wastes energy and has certain influence on the surrounding environment, and partial facilities of the thermoelectric company need a large amount of air conditioners for refrigeration, consume a large amount of electric energy and consume quite high economic loss, so that the saturated steam after flash evaporation of a boiler continuous discharge tank of the thermoelectric company is used for driving a lithium bromide absorption refrigerator for refrigeration, and the refrigeration requirements of a primary fan at a 0-meter layer of a boiler and a frequency conversion cabin of an induced draft fan are met.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a coal fired power plant waste heat refrigerating system to improve the problem that proposes in the above-mentioned background art, the utility model relates to a rational in infrastructure, can the make full use of current energy, economy is the environmental protection again.

The utility model provides a technical scheme that above-mentioned problem adopted is: a waste heat refrigerating system of a coal-fired power plant comprises a refrigerating unit, a frequency conversion cabin, a condensate tank, a steam mixing device, a safety valve, a stop valve, a pump, a three-way valve, a flowmeter, a pressure gauge, a filter, a first continuous discharge tank, a second continuous discharge tank, a thermometer, a first circulating water pipe, a second circulating water pipe, a first connecting pipe, a second connecting pipe, a third connecting pipe, a return pipe and an inflow pipe; the refrigeration unit is connected with the steam mixing device through the first connecting pipe, the safety valve, the filter and the flowmeter are arranged on the first connecting pipe, and the first connecting tank and the second connecting tank are respectively connected to the steam mixing device; the refrigerating unit is connected with the variable-frequency cabin through the third connecting pipe, and the thermometer is arranged on the third connecting pipe; the refrigerating unit is connected with the water condensing tank through the second connecting pipe; the refrigerating unit is connected with the first circulating water pipe through the return pipe, and the pump and the three-way valve are arranged on the return pipe; the refrigerating unit is connected with the second circulating water pipe through the inflow pipe.

Preferably, all be equipped with on first connecting pipe with the third connecting pipe the manometer, the back flow pipe the inflow pipe first circulating water pipe second circulating water pipe first connecting pipe the second connecting pipe with the third connecting pipe all adopts stainless steel material to make, and all installs the stop valve.

Preferably, the water condensing tank pump is arranged on one side of the bottom of the water condensing tank, the third connecting pipe is composed of an air conditioner water inlet pipe and an air conditioner water return pipe, and a steam source pipe is arranged on one side of the bottom end of the refrigerating unit.

Preferably, the second circulating water pipe is connected with the inflow pipe in a welding mode, the first circulating water pipe is connected with the return pipe in a welding mode, and the return pipe and the inflow pipe are fixedly connected with the refrigerating unit through a connecting flange.

Preferably, the first connecting pipe is respectively and fixedly connected with the refrigerating unit and the steam mixing device through connecting flanges, and the third connecting pipe is respectively and fixedly connected with the refrigerating unit and the variable frequency cabin through connecting flanges.

Preferably, the first continuous-row tank and the second continuous-row tank are connected with the steam mixing device through continuous-row tank connecting pipes.

Compared with the prior art, the utility model, have following advantage and effect: the waste heat refrigerating system of the coal-fired power plant solves the problem that the boiler generates a large amount of saturated steam to pollute the surrounding environment; the saturated steam is used for replacing the original electric air conditioner to realize refrigeration, so that the electric energy is saved, and the economic benefit in the production process is greatly improved. The utility model discloses compensate the weak point in the background art to a certain extent.

Drawings

Fig. 1 is a schematic structural diagram of the overall system of the present invention;

fig. 2 is a schematic view of a connection structure between the steam mixing device and the refrigerating unit according to the present invention;

fig. 3 is a schematic view of a connection structure between the refrigerating unit and the variable frequency cabin of the present invention;

fig. 4 is a schematic view of the connection structure of the steam mixing device and the continuous-row tank of the present invention.

In the figure: 1. refrigerating unit, 2, frequency conversion cabin, 3, condensate tank, 4, steam mixing device, 5, relief valve, 6, stop valve, 7, the pump, 8, the three-way valve, 9, the flowmeter, 10, the manometer, 11, the filter, 12, first connecting tank, 13, the second is even arranged the jar, 14, the thermometer, 15, first circulating water pipe, 16, second circulating water pipe, 17, first connecting pipe, 18, the second connecting pipe, 19, the third connecting pipe, 20, the back flow, 21, the inlet tube.

Detailed Description

The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.

Referring to fig. 1 to 4, the present invention provides a technical solution: the utility model provides a coal fired power plant waste heat refrigerating system, includes refrigerating unit 1, frequency conversion cabin 2, condensate tank 3, steam mixing device 4, relief valve 5, stop valve 6, pump 7, three-way valve 8, flowmeter 9, manometer 10, filter 11, first connecting tank 12, second even row of jar 13, thermometer 14, first circulating pipe 15, second circulating pipe 16, first connecting pipe 17, second connecting pipe 18, third connecting pipe 19, back flow 20 and inlet pipe 21.

The refrigerating unit 1 is connected with the steam mixing device 4 through a first connecting pipe 17, a safety valve 5, a filter 11 and a flowmeter 9 are arranged on the first connecting pipe 17, and a first connecting tank 12 and a second connecting tank 13 are respectively connected to the steam mixing device 4; the refrigerating unit 1 is connected with the frequency conversion cabin 2 through a third connecting pipe 19, and a thermometer 14 is arranged on the third connecting pipe 19; the refrigerating unit 1 is connected with the water condensing tank 3 through a second connecting pipe 18; the refrigerating unit 1 is connected with the first circulating water pipe 15 through a return pipe 20, and a pump 7 and a three-way valve 8 are arranged on the return pipe 20; the refrigerating unit 1 is connected to the second circulating water pipe 16 through the inflow pipe 21.

The first connecting pipe 17 and the third connecting pipe 19 are respectively provided with a pressure gauge 10, the return pipe 20, the inflow pipe 21, the first circulating water pipe 15, the second circulating water pipe 16, the first connecting pipe 17, the second connecting pipe 18 and the third connecting pipe 19 are all made of stainless steel materials, and are respectively provided with a stop valve 6.

A water condensing tank pump is arranged on one side of the bottom of the water condensing tank 3, a third connecting pipe 19 is composed of an air conditioner water inlet pipe and an air conditioner water return pipe, and a steam source pipe is arranged on one side of the bottom end of the refrigerating unit 1.

The second circulating water pipe 16 is connected with the inlet pipe 21 through welding, the first circulating water pipe 15 is connected with the return pipe 20 through welding, and the return pipe 20 and the inlet pipe 21 are fixedly connected with the refrigerating unit 1 through connecting flanges.

The first connecting pipe 17 is fixedly connected with the refrigerating unit 1 and the steam mixing device 4 through connecting flanges respectively, and the third connecting pipe 19 is fixedly connected with the refrigerating unit 1 and the variable frequency cabin 2 through connecting flanges respectively.

The first and

second tandem tanks

12 and 13 are connected to the steam mixing unit 4 through tandem tank connection pipes.

The working principle is as follows: calculating data according to the heat of the refrigerating unit 1, wherein the maximum design value of the sewage quantity of a single fire grate is 5.48 t/h; the sum of the average values of the actual continuous drainage of the first continuous drainage tank 12 and the second continuous drainage tank 13 is 5t/h, and the saturated steam amount corresponding to 175 ℃ and 0.73MPa is about 2.3t/h and the saturated steam amount corresponding to 135 ℃ and 0.3MPa is about 2.45t/h by adopting the calculation of a flash module of ASPEN software. If the design is carried out according to the condition that the rated steam pressure of the inlet of the refrigerating unit is 0.4Mpa and the instability of the flash evaporation steam flow of the first continuous discharge tank 12 and the second continuous discharge tank 13 is considered, the designed refrigerating unit can meet the refrigerating requirements of the two variable-frequency cabins 2 under the condition of 80% load. Under the normal condition, the flash steam introduces steam type lithium bromide refrigerator, can satisfy the refrigeration demand of first jar 12, the second jar 13 unit frequency conversion cabin 2 of arranging in succession completely, and unnecessary steam still leads to the oxygen-eliminating device.

An absorption refrigeration system is adopted, so that the steam heat from the first continuous discharge tank 12, the second continuous discharge tank 13 to the deaerator plays a greater role, air-conditioning refrigeration is carried out, and the original electric air conditioner is replaced; the condensed water in the water condensing tank 3 which does work is recycled to other low-pressure inlets, and heat and water are continuously recycled, so that energy is deeply saved; one path of steam source is connected and led by the auxiliary steam header to be used as a standby steam source of the refrigerating unit 1, so that the unit can be ensured to continuously and stably operate; water in the first circulating water pipe 15 and the second circulating water pipe 16 is fed to the inlet of the condenser to be taken as unit cooling water, and the cooling water after heat exchange returns to the circulating water pipeline at the outlet of the condenser; the first circulation water pipe 15 and the second circulation water pipe 16 are connected with a steam drum to discharge the drained water to a continuous blowdown flash tank, after expansion flash evaporation, the recovered steam is led to a deaerator, and a drain valve at the bottom of the flash tank discharges the water to a periodic blowdown tank; the bottom of the steam mixing device is provided with an automatic steam trap, so that the mixed steam carrying water drops can be prevented from scouring the pipeline and the equipment when the equipment is started or operated.

A three-way structure is additionally arranged in the flash evaporation steam pipelines of the original first continuous discharge tank 12 and the original second continuous discharge tank 13 respectively, one path of steam is converged to the steam mixing device 4 at the inlet of the refrigerating unit 1 through a pipeline, and the other path of steam still returns to the corresponding deaerator; in order to ensure that the condition that steam flows into the blowing-out unit is not generated when a single unit is stopped, a corresponding valve is arranged in a steam pipeline of each unit, and the system is closed to isolate when the unit is stopped.

Considering the steam pocket continuous drainage flow rate and the pressure instability of the first continuous drainage tank 12 and the second continuous drainage tank 13, in order to ensure that the continuous enough steam flow rate meets the safe and stable operation of the refrigerator, thereby meeting the refrigeration requirements of the primary fan and the induced draft fan frequency conversion cabin 2 of the first continuous drainage tank 12 and the second continuous drainage tank 13, a high-pressure auxiliary steam header of the first continuous drainage tank 12 is connected with a steam source to a steam mixing device, a temperature and pressure reducing valve is arranged on the pipeline, the high-pressure auxiliary steam parameters are reduced from 0.8Mpa and 260 ℃ to saturated steam under 0.4Mpa, an electric regulating valve is arranged, and according to a signal fed back by a flowmeter at the inlet of the refrigerating unit, when the total flow rate of the flash steam of the first continuous drainage tank 12 and the second continuous drainage tank 13 is less than 80% of a rated value, the electric regulating valve is automatically opened to supplement the required steam, and the output of the refrigerating equipment is ensured to be more than.

The utility model discloses the key feature: the refrigerating requirements of two variable frequency rooms of a primary fan and a draught fan of the first continuous row tank 12 and the second continuous row tank 13 are met, the refrigerating capacity is 1284KW, and continuous and stable operation is realized; the coefficient of performance of the absorption refrigerator, namely COP is more than or equal to 1.3; the outlet temperature of the refrigerant water is 7-10 ℃; under the condition that the unit operates for 4850 hours per year, the unit operates for 5500 hours per year, the air conditioner power in winter is halved by considering seasonal changes, the number of hours of operation in the whole year is 4850 hours, and the electricity is saved by 228 ten thousand degrees per year.

Although the present invention has been described with reference to the above embodiments, it should not be construed as being limited to the scope of the present invention, and any modifications made by those skilled in the art without departing from the spirit and scope of the present invention should be construed as being included in the following claims.

Claims

1. A waste heat refrigerating system of a coal-fired power plant comprises a refrigerating unit (1), a frequency conversion cabin (2), a condensate tank (3), a steam mixing device (4), a safety valve (5), a stop valve (6), a pump (7), a three-way valve (8), a flowmeter (9), a pressure gauge (10), a filter (11), a first continuous discharge tank (12), a second continuous discharge tank (13), a thermometer (14), a first circulating water pipe (15), a second circulating water pipe (16), a first connecting pipe (17), a second connecting pipe (18), a third connecting pipe (19), a return pipe (20) and a flow inlet pipe (21); the refrigeration unit (1) is connected with the steam mixing device (4) through the first connecting pipe (17), the safety valve (5), the filter (11) and the flowmeter (9) are arranged on the first connecting pipe (17), and the first connecting tank (12) and the second connecting tank (13) are respectively connected to the steam mixing device (4); the refrigerating unit (1) is connected with the variable-frequency cabin (2) through the third connecting pipe (19), and the thermometer (14) is arranged on the third connecting pipe (19); the refrigerating unit (1) is connected with the water condensing tank (3) through the second connecting pipe (18); the refrigerating unit (1) is connected with the first circulating water pipe (15) through the return pipe (20), and the pump (7) and the three-way valve (8) are arranged on the return pipe (20); the refrigerating unit (1) is connected with the second circulating water pipe (16) through the inflow pipe (21).

2. The coal-fired power plant waste heat refrigerating system according to claim 1, characterized in that the pressure gauge (10) is arranged on each of the first connecting pipe (17) and the third connecting pipe (19), the return pipe (20), the inflow pipe (21), the first circulating water pipe (15), the second circulating water pipe (16), the first connecting pipe (17), the second connecting pipe (18) and the third connecting pipe (19) are made of stainless steel materials, and the stop valves (6) are installed on the return pipe and the third connecting pipe.

3. The waste heat refrigerating system of the coal-fired power plant as recited in claim 1, characterized in that a water condensing tank pump is arranged on one side of the bottom of the water condensing tank (3), the third connecting pipe (19) is composed of an air conditioner water inlet pipe and an air conditioner water return pipe, and a steam source pipe is arranged on one side of the bottom end of the refrigerating unit (1).

4. The coal-fired power plant waste heat refrigerating system as recited in claim 1, characterized in that the second circulating water pipe (16) is connected with the inflow pipe (21) by welding, the first circulating water pipe (15) is connected with the return pipe (20) by welding, and the return pipe (20) and the inflow pipe (21) are both fixedly connected with the refrigerating unit (1) by a connecting flange.

5. The coal-fired power plant waste heat refrigerating system according to claim 1, characterized in that the first connecting pipe (17) is fixedly connected with the refrigerating unit (1) and the steam mixing device (4) through connecting flanges respectively, and the third connecting pipe (19) is fixedly connected with the refrigerating unit (1) and the frequency conversion cabin (2) through connecting flanges respectively.

6. The coal-fired power plant waste heat refrigeration system according to claim 1, characterized in that the first continuous tank (12) and the second continuous tank (13) are connected with the steam mixing device (4) through a continuous tank connecting pipe.