CN218544866U

CN218544866U - Tower-type gas-liquid mixed flow pipe row heat absorption device

Info

Publication number: CN218544866U
Application number: CN202223042659.2U
Authority: CN
Inventors: 龚国进; 陈煜达; 宋士雄; 陈昊; 沈平; 谢文韬
Original assignee: Shanghai Parasol Renewable Energy Co ltd
Current assignee: Shanghai Parasol Renewable Energy Co ltd
Priority date: 2022-11-16
Filing date: 2022-11-16
Publication date: 2023-02-28
Anticipated expiration: 2032-11-16

Abstract

The utility model belongs to the field of solar photo-thermal power generation, and particularly discloses a tower-type gas-liquid mixed flow pipe heat absorption device, which comprises a plurality of heat absorption pipes, a header, a fused salt inlet pipe, a gas inlet device, a fused salt outlet pipe and a gas outlet pipe, wherein two ends of each heat absorption pipe are respectively welded on the header, the heat absorption pipes are vertically arranged, and the header is horizontally arranged; the molten salt inlet pipe and the gas inlet device are arranged on the lower header, and the molten salt outlet pipe and the gas outlet pipe are arranged on the upper header. The utility model has the advantages of simple structure, low cost, uniform heating, small liquid pressure, small thermal stress, high heat exchange efficiency, uniform thermal expansion and high operation safety; use the utility model discloses can effectively ensure light and heat power station heat sink safety and stability operation to higher economic nature has.

Description

Tower-type gas-liquid mixed flow pipe row heat absorption device

Technical Field

The utility model belongs to the solar photothermal power field, concretely relates to tower-type solar-thermal power heat absorption device.

Background

The tower type heat absorption device is one of core equipment of a power station, only half surface of each heat absorption circular tube absorbs heat, heat absorption capacity is distributed in a curve mode in the semi-circumferential direction, energy is concentrated in local, and the temperature difference of the wall surface is large. The internal fused salt has low heat conductivity coefficient, low heat exchange efficiency and large thermal stress. Generally, the method of increasing the flow velocity and increasing the turbulence intensity is adopted to increase the heat exchange efficiency, so that the situation that the pressure in the tower type heat absorption pipe is very high is caused, and the heat exchange efficiency is difficult to further improve by increasing the internal flow velocity.

At present, a tower-type heat absorption pipe is filled with molten salt, the heat conductivity of the molten salt is poor, the temperature of the molten salt close to a thin layer of the heating surface is very high, and the temperature difference between the molten salt and the molten salt at other positions is very large, so that the heat absorption pipe is large in thermal stress, easy to damage and poor in safety.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: aiming at the defects and shortcomings of the existing tube row heat absorption device, the tower type gas-liquid mixed flow tube row heat absorption device is provided so as to improve the economic benefit and safety of the tower type heat absorption device.

Tower gas-liquid mixed flow tube row heat absorption dress replacement heat capacity is high, and pressure is little, and heat absorption pipe thermal stress is little, and is longe-lived, can reduce the heat sink cost.

In order to achieve the above object, the utility model adopts the following technical scheme:

the tower type gas-liquid mixed flow tube row heat absorption device is composed of a plurality of heat absorption tubes, headers, a molten salt inlet tube, a gas inlet device, a molten salt outlet tube and a gas outlet tube, wherein two ends of each heat absorption tube are respectively welded on the headers, the heat absorption tubes are vertically arranged, and the headers are horizontally arranged; the molten salt inlet pipe and the gas inlet device are arranged on the lower header, and the molten salt outlet pipe and the gas outlet pipe are arranged on the upper header.

The heat sink is configured to absorb energy in the radiant region. The utility model discloses well heat absorption pipe is vertical places, and the fused salt reduces because of the pressure that gravity formed gradually to it heaies up to absorb the heat constantly. The pressure of the internal gas is reduced in the rising process, the temperature is raised, and then the sectional area and the speed are both rapidly increased, so that the flow velocity of the molten salt is improved, and the heat exchange capability of the molten salt is improved. In the gas and liquid mixed flow heat absorption pipe, the gas flow velocity is very high, the gas and liquid mixed flow heat absorption pipe belongs to a turbulent flow state, the shape is constantly changed, and irregular oscillation is generated, so that the heat conduction and heat convection of the liquid in the heat absorption pipe can be enhanced, and the medium is uniformly heated everywhere. By combining the three characteristics, the thickness of the molten salt is gradually reduced and the molten salt is continuously vibrated in the flowing process of the heat absorption medium in the heat absorption pipe for gas and liquid mixed flow, the medium is uniformly heated under the combined action of heat convection and heat conduction, the heat absorption efficiency is high, and the pressure is low.

The utility model discloses in: the heat absorbing pipe material is stainless steel, preferably nickel-based alloy steel, and the header and the heat absorbing pipe are made of the same material. The header and the gas and liquid inlet and outlet areas are covered by protective materials to avoid illumination radiation. The liquid heat exchange medium is molten salt for a conventional tower type heat absorber.

The utility model discloses in: all the heat absorbing pipes are identical, and the gas and liquid inlets have similar structures and are provided with respective headers and branch inlets. At the bottom of the heat absorption pipe, gas flows upwards in the middle and liquid flows upwards at the periphery. The flow of gas and liquid in each tube is uniform.

The utility model discloses in: molten salt in the heat absorption device flows close to the wall surface, the mass flow is small, the same mass flow needs tens of times of the width of the assembly, the original flow of the original eleven groups of tube rows connected in series is optimized to flow of the eleven groups of tube rows connected in parallel, and the flow pressure of the molten salt is greatly reduced. The low-temperature molten salt is heated to a set temperature through a group of tube banks and is discharged into the hot molten salt buffer tank without special gas-liquid separation equipment.

After the structure is adopted, the utility model discloses beneficial effect does:

(1) The utility model discloses in, the molten salt mass flow is little in every heat absorption pipe, has reduced the invalid flow in the poor center of heat conduction, and it is efficient to heat up, and it is even to heat up, can be fast even conduct the energy to in the thin heat absorption medium.

(2) The utility model discloses in, the heat absorption pipe center gas flow velocity is very fast, can effectively promote fused salt speed all around, and gaseous still drives liquid periodic oscillation, makes liquid temperature distribution even, and heat absorption pipe surface temperature is even.

(3) The utility model discloses in, heat absorption pipe top fused salt temperature is the highest, but liquid thickness is thinnest, and the velocity of flow is the biggest, and heat transfer capacity is strongest, can effectively reduce the biggest thermal stress, lifting means security.

(4) The utility model discloses in, gas, liquid flow direction are for flowing from bottom to top. The center of the heat absorption tube uses gas to replace liquid with low heat exchange efficiency, and the whole pressure is small. When the emergency power cut, the pressure required for maintaining the flow is small, and the emergency system is simple.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this application, but do not constitute a limitation on the invention.

Fig. 1 is the overall structure schematic diagram of the embodiment of the present invention: the heat absorption device comprises a fused salt inlet pipe 1, a gas inlet device 2, a lower header 3, a heat absorption pipe 4, an upper header 5, a fused salt outlet pipe 6 and a gas outlet pipe 7.

Fig. 2 is a sectional view of fig. 1.

Fig. 3 is a schematic structural view of the gas inlet device.

Detailed Description

The following detailed description of the embodiments of the invention, taken in conjunction with the accompanying drawings, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the invention without limiting it.

Examples

As shown in fig. 1, a tower-type gas-liquid mixed flow pipe heat absorption device comprises a plurality of heat absorption pipes, a header, a molten salt inlet pipe 1, a gas inlet device 2, a molten salt outlet pipe 6 and a gas outlet pipe 7, wherein two ends of each heat absorption pipe 4 are respectively welded on the header, the heat absorption pipes are vertically arranged, and the header is horizontally arranged; the molten salt inlet pipe 1 and the gas inlet device 2 are arranged on the lower header 3, and the molten salt outlet pipe 6 and the gas outlet pipe 7 are arranged on the upper header 5.

Liquid is uniformly distributed to each branch heat absorption pipe from the lower header 3, and a plurality of strands of liquid flow into the upper header 5 after the temperature of the liquid is raised through heat on the wall surface of the heat absorption pipe by heat conduction and forced convection heat exchange, and then are discharged or enter the next group of heat absorption devices.

As shown in fig. 2-3, the gas inlet device has the same structure as the liquid inlet device, and is a structure of a header and branch pipes, and each branch pipe extends into each heat absorption pipe. The gas is uniformly distributed to each gas branch pipe from the internal header, the gas flows in the center of the liquid, the temperature and the sectional area of a plurality of strands of gas are raised, then the gas flows into the upper header and is directly discharged into the hot-melt salt buffer tank, and the gas and the liquid are separated in the buffer tank.

Take a conventional molten salt absorber tube with a total height of 30 meters as an example. At the lowest end, the temperature of the molten salt is 280 ℃, the pressure formed by the height difference is about 0.5Mpa, the average flow velocity of the molten salt is 1m/s, the gas balance flow velocity at the lower end is about 40m/s, and the gas accounts for 20 percent of the cross section area; at the uppermost end, the pressure is 0, the temperature 570 ℃, and the gas occupies about 80% of the cross-sectional area. The pressure of the gas is reduced to 1/5 in the rising process, the absolute temperature is increased by about 0.5 times, the speed is increased by 50 percent, and the average flow velocity of the molten salt is about 3.3m/s and the average flow velocity of the gas is about 60m/s according to the ideal gas state equation.

Claims

1. A tower-type gas-liquid mixed flow pipe heat absorption device is characterized by comprising a plurality of heat absorption pipes, a header, a molten salt inlet pipe, a gas inlet device, a molten salt outlet pipe and a gas outlet pipe, wherein two ends of each heat absorption pipe are respectively welded on the header; the molten salt inlet pipe and the gas inlet device are arranged on the lower header, and the molten salt outlet pipe and the gas outlet pipe are arranged on the upper header.

2. The tower-type gas-liquid mixed flow tube row heat absorption device as claimed in claim 1, wherein the upper parts of the header and the gas-liquid mixed flow region are covered with a protective material to prevent light radiation.

3. The tower gas-liquid mixed flow tube row heat absorption device of claim 1, wherein the gas inlet device is composed of a header and branch tubes, and each branch tube extends into each heat absorption tube.