阅读说明：本技术 一种吸热系统及减小吸热系统下降管振动的方法 (Heat absorption system and method for reducing vibration of downcomer of heat absorption system ) 是由 周慧 施斌 王建熊 余志勇 毕文剑 于 2020-12-16 设计创作，主要内容包括：本发明公开了一种吸热系统及减小吸热系统下降管振动的方法,通过在与吸热器相连的上升管和下降管之间设置旁通组件,以连通上升管与下降管,使得注入吸热介质时,可从上升管和下降管同步注入吸热器,以在吸热器内吸热介质充满后关闭旁通组件,使吸热介质在下降管内利用重力自上而下连续单相流动,从而有效避免因气液两相流导致的振动,解决了现有吸热系统中下降管振动的问题。同时,保证了吸热系统的系统安全性及稳定性。(The invention discloses a heat absorption system and a method for reducing vibration of a downcomer of the heat absorption system.A bypass assembly is arranged between an ascending pipe and a descending pipe which are connected with a heat absorber to communicate the ascending pipe and the descending pipe, so that when a heat absorption medium is injected, the heat absorber can be synchronously injected from the ascending pipe and the descending pipe, the bypass assembly is closed after the heat absorption medium in the heat absorber is filled, the heat absorption medium continuously flows from top to bottom in a single phase by utilizing gravity in the descending pipe, vibration caused by gas-liquid two-phase flow is effectively avoided, and the problem of vibration of the descending pipe in the existing heat absorption system is solved. Meanwhile, the system safety and stability of the heat absorption system are ensured.)

1. A heat absorption system is characterized by comprising a heat absorber, an ascending pipe, a descending pipe and a bypass assembly;

the input end of the ascending pipe is communicated with an external heat absorption medium input device, and the output end of the ascending pipe is communicated with the input end of the heat absorber;

the input end of the downcomer is communicated with the output end of the heat absorber, and the output end of the downcomer is communicated with an external storage tank;

and two ends of the bypass assembly are respectively connected with the ascending pipe and the descending pipe so as to communicate the ascending pipe with the descending pipe and control the communication or disconnection between the ascending pipe and the descending pipe.

2. The heat absorption system of claim 1 wherein the bypass assembly comprises a bypass tube and a bypass valve set; two ends of the bypass pipe are respectively communicated with the input end of the ascending pipe and the output end of the descending pipe; the bypass valve group is arranged on the bypass pipe and used for controlling the connection or disconnection between the ascending pipe and the descending pipe.

3. The heat absorption system of claim 2 wherein the bypass valve set comprises an on-off valve disposed on the bypass line for controlling the on or off of the bypass line.

4. The heat absorption system of claim 2 wherein the bypass valve block further comprises a regulating valve disposed on the bypass line for regulating the flow rate of the bypass line.

5. The heat absorption system of claim 2 wherein the bypass valve assembly further comprises a check valve disposed on the bypass line for controlling the flow of heat absorbing medium in the bypass line.

6. The heat absorption system as recited in claim 1 wherein said downcomer is provided with a downcomer damper for controlling the flow rate and make-and-break of the heat absorbing medium in said downcomer; and the connection position of the bypass assembly and the descending pipe is positioned between the input end of the descending pipe and the descending pipe adjusting valve.

7. A method for reducing the vibration of a downcomer of a heat absorption system, applied to a heat absorption system according to any one of claims 1 to 6, comprising the following steps:

s1: when the heat absorber is started to enter heat absorption media, the bypass assembly is opened to communicate the ascending pipe and the descending pipe, so that the heat absorption media synchronously enter the heat absorber from the ascending pipe and the descending pipe;

s2: after the heat absorber and the downcomer are filled with the heat absorbing medium, the bypass assembly is closed, so that the heat absorbing medium flows from top to bottom in the downcomer, and the downcomer is prevented from vibrating due to gas-liquid two-phase flow.

Technical Field

The invention belongs to the technical field of solar thermal power generation, and particularly relates to a heat absorption system and a method for reducing vibration of a downcomer of the heat absorption system.

Background

In the tower type solar thermal power generation industry, whether a down pipe and a down pipe regulating valve of a heat absorption system can work safely and smoothly is directly related to the safe and stable operation of a power station. In current engineering practice, the vertical drop of the downcomer pipe is large and the pipeline is long due to the high height of the heat absorption tower. Meanwhile, the heat absorbing medium in the heat absorber naturally falls and flows to the storage tank in the descending pipe through self gravity, so that the flow rate of the heat absorbing medium in the pipe is very high, the heat absorbing medium flowing at high speed is rapidly mixed with the original retained air in the pipe to form intermittent gas-liquid two-phase flow, the vibration of the pipeline is further aggravated, and the serious impact is caused to the whole descending pipe and the descending pipe regulating valve. The descending pipe has the characteristics of long pipeline length, large installation fall, great pressure drop before and after the descending pipe valve adjusting valve, and the like, so that the corresponding maintenance and replacement cost is high, the period is long, and the system safety and the stability of the heat absorption system are low.

Disclosure of Invention

The invention aims to provide a heat absorption system and a method for reducing vibration of a downcomer of the heat absorption system, so as to solve the problem of vibration of the downcomer in the conventional heat absorption system.

In order to solve the problems, the technical scheme of the invention is as follows:

the invention relates to a heat absorption system, which comprises a heat absorber, an ascending pipe, a descending pipe and a bypass assembly;

the input end of the ascending pipe is communicated with an external heat absorption medium input device, and the output end of the ascending pipe is communicated with the input end of the heat absorber;

the input end of the downcomer is communicated with the output end of the heat absorber, and the output end of the downcomer is communicated with an external storage tank;

and two ends of the bypass assembly are respectively connected with the ascending pipe and the descending pipe so as to communicate the ascending pipe with the descending pipe and control the communication or disconnection between the ascending pipe and the descending pipe.

According to the heat absorption system, the bypass assembly comprises a bypass pipe and a bypass valve bank; two ends of the bypass pipe are respectively communicated with the input end of the ascending pipe and the output end of the descending pipe; the bypass valve group is arranged on the bypass pipe and used for controlling the connection or disconnection between the ascending pipe and the descending pipe.

According to the heat absorption system, the bypass valve group comprises the switch valve, and the switch valve is arranged on the bypass pipe and used for controlling connection or disconnection of the bypass pipe.

In the heat absorption system, the bypass valve group further comprises a regulating valve arranged on the bypass pipe and used for regulating the flow of the bypass pipe.

According to the heat absorption system, the bypass valve group further comprises a check valve arranged on the bypass pipe and used for controlling the flow direction of a heat absorption medium in the bypass pipe.

The heat absorption system is characterized in that a downcomer adjusting valve is arranged on the downcomer and used for controlling the on-off and flow rate of a heat absorption medium in the downcomer; and the connection position of the bypass assembly and the descending pipe is positioned between the input end of the descending pipe and the descending pipe adjusting valve.

The invention discloses a method for reducing vibration of a heat absorption system downcomer, which is applied to any heat absorption system and comprises the following specific steps:

s1: when the heat absorber is started to enter heat absorption media, the bypass assembly is opened to communicate the ascending pipe and the descending pipe, so that the heat absorption media synchronously enter the heat absorber from the ascending pipe and the descending pipe;

s2: after the heat absorber and the downcomer are filled with the heat absorbing medium, the bypass assembly is closed, so that the heat absorbing medium flows from top to bottom in the downcomer, and the downcomer is prevented from vibrating due to gas-liquid two-phase flow.

Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:

according to the embodiment of the invention, the bypass assembly is arranged between the ascending pipe and the descending pipe which are connected with the heat absorber to communicate the ascending pipe and the descending pipe, so that the heat absorber can be synchronously injected from the ascending pipe and the descending pipe when the heat absorbing medium is injected, and the effect of filling the descending pipe with the heat absorber is achieved. After the heat absorption medium in the heat absorber is filled, the bypass assembly is closed, so that the heat absorption medium continuously flows in a single phase from top to bottom in the downcomer by utilizing gravity, vibration caused by gas-liquid two-phase flow is effectively avoided, and the problem of vibration of the downcomer in the conventional heat absorption system is solved.

Drawings

FIG. 1 is a schematic view of a heat absorption system of the present invention.

Description of reference numerals: 1: a heat sink; 2: a down pipe; 3: a riser pipe; 4: a heat absorption system; 5: a bypass pipe; 6: a bypass valve bank.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and embodiments, and a method for reducing the vibration of a downcomer of a heat absorption system will be described in detail below. Advantages and features of the present invention will become apparent from the following description and from the claims.

Example one

Referring to fig. 1, in one embodiment, a heat absorption system 4 includes a heat sink 1, an riser 3, a downcomer 2, and a bypass assembly.

Wherein, the input end of the ascending pipe 3 is communicated with an external heat absorbing medium input device, and the output end is communicated with the input end of the heat absorber 1. The input end of the downcomer 2 is communicated with the output end of the heat absorber 1, and the output end of the downcomer 2 is communicated with an external storage tank. The two ends of the bypass assembly are respectively connected with the ascending pipe 3 and the descending pipe 2 so as to communicate the ascending pipe 3 with the descending pipe 2 and control the communication or disconnection between the ascending pipe 3 and the descending pipe 2.

In the embodiment, the bypass assembly is arranged between the ascending pipe 3 and the descending pipe 2 connected with the heat absorber 1 to communicate the ascending pipe 3 with the descending pipe 2, so that when the heat absorbing medium is injected, the heat absorber 1 can be synchronously injected from the ascending pipe 3 and the descending pipe 2, the bypass assembly is closed after the heat absorber 1 is filled with the heat absorbing medium, the heat absorbing medium continuously flows in a single phase from top to bottom in the descending pipe 2 by utilizing gravity, the vibration caused by gas-liquid two-phase flow is effectively avoided, and the problem of the vibration of the descending pipe 2 in the existing heat absorbing system 4 is solved. Meanwhile, the system safety and stability of the heat absorption system 4 are ensured.

The bypass component of the heat absorbing system 4 of the present embodiment is further described as follows:

in the present embodiment, the bypass assembly may specifically include a bypass pipe 5 and a bypass valve set 6, wherein both ends of the bypass pipe 5 are respectively communicated with the input end of the ascending pipe 3 and the output end of the descending pipe 2. In other embodiments, the bypass pipe 5 may also directly communicate with the external heat absorbing medium input device, and is not limited herein. And the bypass valve group 6 is arranged on the bypass pipe 5 and is used for controlling the connection or disconnection between the ascending pipe 3 and the descending pipe 2.

Further, the bypass valve block 6 includes an on-off valve. The switch valve is arranged on the bypass pipe 5 and is used for controlling the connection or disconnection of the bypass pipe 5 so as to realize the switch of the heat-absorbing medium entering the downcomer 2 through the bypass pipe 5.

Further, the bypass valve set 6 may further include an adjusting valve disposed on the bypass pipe 5 for adjusting the flow rate of the heat absorbing medium in the bypass pipe 5.

Further, the bypass valve set 6 may further include a check valve provided on the bypass pipe 5 to control a flow direction of the heat absorbing medium in the bypass pipe 5 to prevent the heat absorbing medium in the bypass pipe 5 from flowing reversely.

And different flow directions and flows of the heat absorbing medium in the ascending and descending processes can be realized through the series connection, the parallel connection, the arrangement and the combination of each valve in the bypass assembly and the bypass pipe 5, such as the functions of regulating the temperature and the flow of the heat absorbing medium in the thermal state of the downcomer 2. For example, the cold heat absorbing medium on the side of the riser 3 is injected into the hot heat absorbing medium on the side of the downcomer 2 through the bypass pipe, and the temperature of the hot heat absorbing medium in the downcomer 2 is adjusted by controlling the flow rate of the cold heat absorbing medium flowing through the bypass pipe.

In this embodiment, the downcomer 2 is provided with a downcomer damper for controlling the flow rate of the heat absorbing medium in the downcomer 2. And the connection of the by-pass pipe 5 and the down pipe 2 is between the input end of the down pipe 2 and the down pipe regulating valve. When the heat absorbing medium is injected, the down pipe adjusting valve is closed, so that the heat absorbing medium in the down pipe 2 cannot be output and can only be injected upwards into the heat absorber 1, and the effect of filling the down pipe 2 is achieved. After the heat absorber 1 and the downcomer 2 are filled with the heat absorption medium, the downcomer adjusting valve is gradually opened, so that the heat absorption medium is gradually stored in the external storage tank from top to bottom continuously through the downcomer 2. At this time, the liquid heat absorbing medium flows in the downcomer 2 in full, so that the vibration phenomenon of the downcomer 2 caused by gas-liquid two-phase flow can be effectively avoided.

In the present embodiment, the heat absorbing medium may be molten salt, water, liquid metal, or solid heat absorbing particles, and is not particularly limited herein.

Example two

A method for reducing the vibration of a downcomer 2 of a heat absorption system 4 is applied to the heat absorption system 4 of the previous embodiment, and comprises the following specific steps:

step S1: when the heat absorber 1 is started to feed heat absorption medium, the bypass assembly is opened to communicate the ascending pipe 3 with the descending pipe 2, so that the heat absorption medium synchronously enters the heat absorber 1 from the ascending pipe 3 and the descending pipe 2.

Step S2: after the heat absorber 1 and the downcomer 2 are filled with the heat absorbing medium, the bypass assembly is closed, so that the heat absorbing medium flows from top to bottom in the downcomer 2, and the vibration of the downcomer 2 caused by gas-liquid two-phase flow is avoided.

Further, in step S1, the bypass assembly is opened, that is, the on-off valve on the bypass pipe 5 is opened. In step S2, after the on-off valve on the bypass pipe 5 is closed, the down pipe damper is gradually opened to allow the heat-absorbing medium to be stored in the external storage tank from top to bottom through the down pipe 2, thereby ensuring that the heat-absorbing medium is filled in the down pipe 2 all the time to ensure the effect of avoiding vibration.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is still within the scope of the present invention if they fall within the scope of the claims of the present invention and their equivalents.