CN217818303U - Multi-storage-tank series preheating system of photo-thermal power station - Google Patents

Abstract

The utility model discloses a multi-storage tank series preheating system for a photothermal power station. The multi-storage tank series preheating system for a photothermal power station includes a preheating device. One end of the preheating device is fixedly connected with a natural gas inlet pipe and an air inlet pipe. The end of the heating device away from the natural gas inlet pipe and the air inlet pipe is fixedly connected with a natural gas exhaust pipe and a high-temperature molten salt tank inlet pipe, and the preheating device is connected with a high-temperature molten salt tank through a high-temperature molten salt tank inlet pipe, and a high-temperature molten salt tank It is also connected with the high-temperature molten salt tank outlet pipe, the high-temperature molten salt tank is connected to the low-temperature molten salt tank through the high-temperature molten salt tank outlet pipe, the low-temperature molten salt tank is also connected with the low-temperature molten salt tank exhaust pipe, and the low-temperature molten salt tank exhaust pipe It runs through the low-temperature molten salt tank and extends away from the low-temperature molten salt tank. The preheating of the low-temperature molten salt tank of the utility model utilizes the waste heat at the outlet of the high-temperature molten salt tank, which can realize waste heat utilization, improve system efficiency, and reduce preheating costs.

Description

Multi-storage tank series preheating system in photothermal power station

technical field

The utility model belongs to the technical field of photothermal power station equipment, in particular to a multi-storage tank series preheating system of a photothermal power station.

Background technique

At present, the mainstream forms of solar thermal power generation include tower type, trough type, linear Fresnel, dish type, etc. The solar thermal power stations under construction and completed generally use molten salt as the heat storage and heat exchange medium.

Molten salt is a mixture of sodium nitrate and potassium nitrate, with a melting point of about 221°C. 60% (NaNO ₃ ) and 40% (KNO ₃ ) were mixed by weight. Liquid molten salt should be able to be used within the temperature range of 260°C to 575°C. After the temperature is lowered, the mixture will start to crystallize at 238°C and completely solidify at 221°C. Before the molten salt enters the molten salt tank, it is necessary to preheat the molten salt storage tank (low temperature salt tank, high temperature salt tank) to prevent molten salt from entering the storage tank Finally, factors such as uneven heating of the large tank due to excessive temperature changes have an adverse effect on the large tank. The temperature of the molten salt entering the salt tank for the first time is about 320°C, so the temperature of the molten salt tank after heating is between 300-340°C. The preheating method uses a gas preheating device to generate hot air and uses a high-temperature fan for forced circulation to the storage tank. In the interior, the liquid molten salt filling work can only be carried out by gradually raising the temperature to about 300°. The conventional storage tank preheating method is to preheat the high-temperature salt tank first, and remove the high-temperature molten salt after the high-temperature salt tank is preheated to the design temperature. Tank preheating equipment, move the dismantled preheating equipment to the low temperature brine tank for installation and preheating. This method has the advantages of complex disassembly and installation of the preheating system, high energy consumption and long preheating time.

Therefore, low-cost, high-efficiency, and low-energy preheating of the storage tanks of tower-type molten salt solar thermal power plants is very necessary.

Utility model content

The purpose of the utility model is to provide a multi-storage tank series preheating system in a photothermal power station, which is beneficial to reduce energy consumption by utilizing waste heat in steps and heating high and low temperature molten salt tanks at the same time.

The technical solution adopted by the utility model is that the multi-storage tank series preheating system of the photothermal power station includes a preheating device. One end of the inlet pipe is fixedly connected with the natural gas exhaust pipe and the intake pipe of the high temperature molten salt tank. The preheating device is connected with the high temperature molten salt tank through the intake pipe of the high temperature molten salt tank, and the high temperature molten salt tank is also connected with the outlet of the high temperature molten salt tank. Pipeline, the high-temperature molten salt tank is connected to the low-temperature molten salt tank through the outlet pipe of the high-temperature molten salt tank, and the low-temperature molten salt tank is also connected to the exhaust pipe of the low-temperature molten salt tank. The exhaust pipe of the low-temperature molten salt tank runs through the low-temperature molten salt tank and faces away The direction of the low-temperature molten salt tank extends.

The utility model is also characterized in that,

The natural gas inlet pipeline is equipped with a natural gas inlet electric regulating valve.

An air inlet fan is provided on the air inlet duct.

The high-temperature molten salt intake pipe intake electric regulating valve is installed on the intake pipe of the high-temperature molten salt tank.

The outlet pipe of the high-temperature molten salt tank is provided with an electric air-intake regulating valve for the inlet pipe of the low-temperature molten salt tank.

A bypass inlet pipe is connected between the inlet pipe of the high-temperature molten salt tank and the outlet pipe of the high-temperature molten salt tank. The air outlet of the bypass air intake pipe is located between the air intake electric regulating valve of the air intake pipe of the low-temperature molten salt tank and the low-temperature molten salt tank.

A bypass pipe air intake electric regulating valve is installed on the bypass air intake pipe.

The extension length of the high temperature molten salt tank inlet pipe inside the high temperature molten salt tank is greater than the extension length of the high temperature molten salt tank outlet pipe.

The extension length of the outlet pipe of the high temperature molten salt tank inside the low temperature molten salt tank is greater than the extension length of the exhaust pipe of the low temperature molten salt tank.

The beneficial effects of the utility model are:

1. The multi-storage tank series preheating system of the utility model photothermal power station uses natural gas to preheat the molten salt tank, which has low cost and is not affected by the weather;

2. The multi-storage tank series preheating system of the solar thermal power station of the utility model can effectively increase the temperature of the molten salt tank and improve the preheating efficiency; and can realize the step utilization of waste heat and simultaneous heating of high and low temperature molten salt tanks, with short time and low cost , Energy-saving effect is remarkable.

Description of drawings

Fig. 1 is a structural schematic diagram of the multi-storage tank series preheating system of the utility model photothermal power station.

In the figure, 1. Preheating device, 2. Natural gas inlet pipe, 3. Natural gas inlet electric control valve, 4. Air inlet pipe, 5. Air inlet fan, 6. High temperature molten salt tank inlet pipe, 7. Natural gas smoke exhaust Pipeline, 8. Bypass pipeline intake electric control valve, 9. Bypass intake pipeline, 10. High temperature molten salt intake pipeline intake electric control valve, 11. High temperature molten salt tank, 12. High temperature molten salt tank outlet pipeline , 13 Low temperature molten salt tank intake pipe intake electric control valve, 14. Low temperature molten salt tank, 15. Low temperature molten salt tank exhaust pipe.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, the multi-storage tank series preheating system of the solar thermal power station of the present invention includes a preheating device 1, and one end of the preheating device 1 is fixedly connected with a natural gas inlet pipe 2 and an air inlet pipe 4, and the preheating device 1 is far away from the natural gas One end of the inlet pipe 2 and the air inlet pipe 4 is fixedly connected with a natural gas exhaust pipe 7 and a high temperature molten salt tank intake pipe 6, and the preheating device 1 is connected with a high temperature molten salt tank 11 through the high temperature molten salt tank intake pipe 6, and The molten salt tank 11 is also connected with a high-temperature molten salt tank outlet pipeline 12, and the high-temperature molten salt tank 11 is connected with a low-temperature molten salt tank 14 through the high-temperature molten salt tank outlet pipeline 12, and the low-temperature molten salt tank 14 is also connected with a low-temperature molten salt tank exhaust gas. The pipeline 15 , the low-temperature molten salt tank exhaust pipeline 15 runs through the low-temperature molten salt tank 14 and extends away from the low-temperature molten salt tank 14 .

The natural gas inlet pipeline 2 is provided with a natural gas inlet electric regulating valve 3 .

An air inlet fan 5 is provided on the air inlet duct 4 .

The high-temperature molten salt tank intake pipe 6 is equipped with a high-temperature molten salt intake pipe intake electric regulating valve 10 .

The high-temperature molten salt tank outlet pipe 12 is provided with a low-temperature molten salt tank intake pipe intake electric regulating valve 13 .

A bypass inlet pipe 9 is communicated between the high-temperature molten salt tank inlet pipe 6 and the high-temperature molten salt tank outlet pipe 12, and the inlet of the bypass inlet pipe 9 is located at the inlet of the preheating device 1 and the high-temperature molten salt inlet pipe. Between the pneumatic electric control valves 10, the air outlet of the bypass air intake pipe 9 is located between the air intake electric control valve 13 and the low temperature molten salt tank 14 of the low temperature molten salt tank air intake line.

A bypass pipeline intake electric regulating valve 8 is installed on the bypass intake pipeline 9 .

The extension length of the high temperature molten salt tank inlet pipeline 6 inside the high temperature molten salt tank 11 is greater than the extension length of the high temperature molten salt tank outlet gas pipeline 12 .

The extension length of the high temperature molten salt tank outlet pipe 12 inside the low temperature molten salt tank 14 is greater than the extension length of the low temperature molten salt tank exhaust pipe 15 .

The working principle and working process of the multi-storage tank series preheating system of the utility model photothermal power station are as follows:

When it is necessary to preheat the molten salt tank, first open the natural gas inlet electric regulating valve 3 and the air inlet fan 5, so that the preheating device 1 reaches the preheating temperature of the molten salt tank, and then close the bypass pipeline intake electric regulating valve 8, Open the high-temperature molten salt intake pipe intake electric regulating valve 10 on the high-temperature molten salt tank intake pipe 6, hot air enters the high-temperature molten salt tank 11 from the high-temperature molten salt tank intake pipe 6, and controls the natural gas inlet electric control valve 3 and the air inlet fan at 5 degrees to make the temperature of the preheating device meet the design high temperature storage tank preheating temperature requirements;

Then open the low-temperature molten salt tank intake pipe air intake electric regulating valve 13 on the high-temperature molten salt tank outlet pipeline 12, so that the hot air after the high-temperature storage tank is cooled enters the low-temperature molten salt tank 14 through the high-temperature molten salt tank outlet pipeline 12, Preheat low temperature molten salt tank;

When the outlet temperature of the high-temperature molten salt tank 11, that is, the inlet temperature of the low-temperature molten salt tank 14 does not reach the preheating temperature of the low-temperature molten salt tank 14, close the high-temperature molten salt intake pipe intake on the intake pipe 6 of the high-temperature molten salt tank The electric regulating valve 10 and the low-temperature molten salt tank air intake electric regulating valve 13 on the high temperature molten salt tank outlet pipe 12 open the bypass pipe air intake electric regulating valve 8 on the bypass air intake pipe 9, so that the hot air Directly enter the low-temperature molten salt tank 14 through the bypass inlet pipe 9 and the high-temperature molten salt tank outlet pipe 12 to preheat the low-temperature molten salt tank 14 .

The preheating device 1 of the utility model is connected with the high-temperature molten salt tank 11 and the low-temperature molten salt tank 14 through pipelines. The high-temperature molten salt tank 11 is connected to the outlet pipe of the high-temperature molten salt tank. The low-temperature molten salt tank 14 is preheated using the waste heat at the outlet of the high-temperature molten salt tank 11. When the low-temperature molten salt tank 14 cannot reach the design temperature by using the waste heat, the bypass air intake can be used. Pipeline 9 performs secondary preheating, and the device can realize waste heat utilization, improve system efficiency, reduce preheating cost, shorten preheating time, simplify preheating system, and achieve the purpose of energy saving and emission reduction.

Claims (9)

1. Many storage tanks of light and heat power station establish ties system of preheating, its characterized in that, including preheating device (1), preheating device (1) one end rigid coupling has natural gas inlet pipeline (2) and air inlet pipeline (4), the one end rigid coupling that natural gas inlet pipeline (2) and air inlet pipeline (4) were kept away from in preheating device (1) has natural gas exhaust pipe (7) and high temperature molten salt jar admission line (6), preheating device (1) has high temperature molten salt jar (11) through high temperature molten salt jar admission line (6) intercommunication, high temperature molten salt jar (11) still intercommunication has high temperature molten salt jar gas outlet pipe way (12), high temperature molten salt jar (11) are through high temperature molten salt jar gas outlet pipe way (12) intercommunication low temperature molten salt jar (14), it has low temperature molten salt jar exhaust pipe (15) to still communicate in low temperature molten salt jar (14), low temperature molten salt jar exhaust pipe (15) run through low temperature molten salt jar (14) and extend towards the direction that deviates from low temperature molten salt jar (14).

2. The photothermal power station multi-tank series preheating system according to claim 1, wherein a natural gas inlet electric regulating valve (3) is provided on the natural gas inlet pipeline (2).

3. The photothermal power station multi-tank series preheating system of claim 1, wherein an air inlet fan (5) is provided on the air inlet duct (4).

4. The photothermal power station multi-storage-tank series preheating system according to claim 1, wherein the high temperature molten salt inlet pipe inlet electric regulating valve (10) is installed on the high temperature molten salt tank inlet pipe (6).

5. The photothermal power station multi-storage-tank series preheating system as recited in claim 1, wherein a low-temperature molten salt tank inlet electric regulating valve (13) is provided on the high-temperature molten salt tank outlet duct (12).

6. The photothermal power station multi-storage-tank series preheating system according to claim 1, wherein a bypass inlet pipe (9) is communicated between the high-temperature molten salt tank inlet pipe (6) and the high-temperature molten salt tank outlet pipe (12), an air inlet of the bypass inlet pipe (9) is located between the preheating device (1) and the high-temperature molten salt inlet pipe inlet electric regulating valve (10), and an air outlet of the bypass inlet pipe (9) is located between the low-temperature molten salt tank inlet pipe inlet electric regulating valve (13) and the low-temperature molten salt tank (14).

7. The photothermal power station multi-tank series preheating system according to claim 6, wherein a bypass duct intake electric regulating valve (8) is installed on the bypass intake duct (9).

8. The photothermal power plant multi-storage tank series preheating system of claim 1, wherein the extension length of the high temperature molten salt tank inlet duct (6) inside the high temperature molten salt tank (11) is greater than the extension length of the high temperature molten salt tank outlet duct (12).

9. The photothermal power plant multi-storage tank series preheating system of claim 1, wherein the extension length of the high temperature molten salt tank outlet duct (12) inside the low temperature molten salt tank (14) is greater than the extension length of the low temperature molten salt tank outlet duct (15).

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