CN216204324U

CN216204324U - Gravity emptying type convection tube bundle

Info

Publication number: CN216204324U
Application number: CN202122644315.8U
Authority: CN
Inventors: 符永和; 姚宏慧; 瞿晟华
Original assignee: Changzhou Zongyan Heating Furnace Co ltd
Current assignee: Changzhou Zongyan Heating Furnace Co ltd
Priority date: 2021-11-01
Filing date: 2021-11-01
Publication date: 2022-04-05
Anticipated expiration: 2031-11-01

Abstract

The utility model discloses a gravity emptying type convection bank which comprises an inlet collecting pipe, an outlet collecting pipe and a plurality of convection pipes arranged between the inlet collecting pipe and the outlet collecting pipe, wherein one end of each convection pipe is communicated with the inlet collecting pipe, the other end of each convection pipe is communicated with the outlet collecting pipe, the inlet collecting pipe and the outlet collecting pipe are obliquely arranged relative to the horizontal direction, each convection pipe is formed by connecting at least one pair of upper pipes and lower pipes which are vertically arranged, the upper pipes are obliquely arranged upwards relative to the horizontal direction, and the lower pipes are obliquely arranged downwards relative to the horizontal direction. The utility model can automatically drain the molten salt by self gravity when the furnace is shut down, avoids serious accidents caused by blockage of the accumulated salt in the furnace, and greatly improves the safety of the system particularly in a large-scale fuel gas molten salt heating furnace system.

Description

Gravity emptying type convection tube bundle

Technical Field

The utility model relates to a molten salt heating furnace, in particular to a convection bank in the molten salt heating furnace using combustible gases such as natural gas, shale gas and the like as fuels.

Background

In the chemical industry, in the melamine industry, the tire cracking industry, the solar heat storage power generation industry and the like, the temperature of a heating medium required by the process is more than 450 ℃, the characteristic of heat conduction oil cannot meet the process requirement, and molten salt serving as a good inorganic heating medium can be used to the maximum of 500 ℃, so that the molten salt heating furnace is widely applied to the industries and is also widely used as a molten salt heating system. However, since the molten salt is solid at room temperature, the molten salt needs to be preheated to more than 142 ℃ before starting, namely, the molten salt is melted into a liquid phase, the temperature reaches about 240 ℃, the molten salt can be pumped into a system pipeline, the molten salt in the system needs to be completely discharged and reflowed back to a molten salt tank after stopping the furnace, otherwise, the molten salt is solidified in the furnace and the system pipeline along with the temperature reduction, and equipment failure is caused. Due to the particularity of the molten salt, the convection bank which is traditionally suitable for the heat-conducting oil and hot water heating furnace can not meet the use requirement of the molten salt heating furnace.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provide the gravity emptying type convection bank which can meet the use requirement of a molten salt heating furnace and has simple structure, safety and reliability.

In order to solve the technical problem, the gravity-emptying type convection bank comprises an inlet collecting pipe, an outlet collecting pipe and a plurality of convection pipes arranged between the inlet collecting pipe and the outlet collecting pipe, wherein one end of each convection pipe is communicated with the inlet collecting pipe, the other end of each convection pipe is communicated with the outlet collecting pipe, the inlet collecting pipe and the outlet collecting pipe are obliquely arranged relative to the horizontal direction, each convection pipe is formed by connecting at least one pair of upper pipes and lower pipes which are vertically arranged, the upper pipes are obliquely arranged upwards relative to the horizontal direction, and the lower pipes are obliquely arranged downwards relative to the horizontal direction.

In a preferred embodiment of the present invention, the inlet collecting pipe and the outlet collecting pipe are inclined at an angle of 2 to 5 ° with respect to the horizontal direction.

In a preferred embodiment of the present invention, the inlet and outlet manifolds are inclined at 3 ° to the horizontal.

In a preferred embodiment of the present invention, the upper pipe is disposed to be inclined upward by 1 to 3 ° with respect to the horizontal direction, and the lower pipe is disposed to be inclined downward by 1 to 3 ° with respect to the horizontal direction.

In a preferred embodiment of the present invention, the upper tube and the lower tube have 2 to 10 pairs, and a support plate is provided between the upper tube and the lower tube.

After adopting the structure, the utility model has the following beneficial effects:

according to the utility model, the inlet collecting pipe and the outlet collecting pipe are obliquely arranged relative to the horizontal direction, each convection pipe is formed by connecting at least one pair of upper pipe and lower pipe which are arranged up and down, the upper pipes are obliquely arranged relative to the horizontal direction, and the lower pipes are obliquely arranged relative to the horizontal direction, so that during operation, molten salt can be automatically emptied by self gravity when the furnace is shut down, thereby avoiding serious accidents caused by blockage of the accumulated salt in the furnace, and greatly improving the safety of the system particularly in a large-scale gas molten salt heating furnace system.

The upper pipe and the lower pipe can adopt small-caliber pipes, so that the heat exchange coefficient is higher than that of the traditional large-caliber coil pipe, and the use efficiency of a heating surface is improved.

The utility model has the advantages of simple structure, low manufacturing cost, safety, reliability, compact structure and small occupied area.

Drawings

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

Fig. 1 is a schematic view of a gravity evacuated convection bank of the present invention.

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

Detailed Description

Referring to fig. 1 and 2, a gravity-evacuated convection bank includes an inlet manifold 1, an outlet manifold 2, and a plurality of convection tubes 3 installed between the inlet manifold 1 and the outlet manifold 2, where the inlet manifold 1 and the outlet manifold 2 are both generally cylindrical, one end of each convection tube 3 is communicated with the inlet manifold 1, and the other end of each convection tube 3 is communicated with the outlet manifold 2, and when in operation, molten salt enters from the inlet manifold 1, flows through the convection tubes 3, and then flows out from the outlet manifold 2; the inlet collecting pipe 1 and the outlet collecting pipe 2 are obliquely arranged relative to the horizontal direction, each convection pipe 3 is formed by connecting at least one pair of upper pipe 3-1 and lower pipe 3-2 which are arranged up and down preferably through welding, the upper pipe 3-1 is obliquely arranged upward relative to the horizontal direction, the lower pipe 3-2 is obliquely arranged downward relative to the horizontal direction, and the upper pipe 3-1 and the lower pipe 3-2 are connected to form a V shape.

In a preferred embodiment of the present invention, the inlet collecting pipe 1 and the outlet collecting pipe 2 are inclined at an angle of 2 to 5 ° with respect to the horizontal direction. As shown in FIG. 1, the inclination angle alpha of the inlet collecting pipe 1 relative to the horizontal direction is between 2 and 5 degrees, and the inclination angle beta of the outlet collecting pipe 2 relative to the horizontal direction is between 2 and 5 degrees.

In a more preferred embodiment of the present invention, the inlet manifold 1 and the outlet manifold 2 are inclined at 3 ° to the horizontal.

In a preferred embodiment of the present invention, the upper pipe 3-1 is disposed to be inclined upward by 1 to 3 degrees with respect to the horizontal direction, and the lower pipe 3-2 is disposed to be inclined downward by 1 to 3 degrees with respect to the horizontal direction. As shown in FIG. 2, the upper tube 3-1 is inclined upward with respect to the horizontal direction at an angle θ of 1 to 3 °, and the lower tube 3-2 is inclined downward with respect to the horizontal direction at an angle η of 1 to 3 °.

As a preferred embodiment of the utility model, the upper pipe 3-1 and the lower pipe 3-2 have 2-10 pairs, the number of the convection pipes 3 and the number of the upper pipe 3-1 and the lower pipe 3-2 can be increased or decreased according to the size of smoke gas, and the support plate 4 is arranged between the upper pipe 3-1 and the lower pipe 3-2, so that the structure is more reliable and firm.

Through a plurality of project tests, the automatic emptying device can automatically empty the molten salt by means of self gravity when the furnace is shut down, avoids serious accidents caused by salt accumulation in the furnace, and has the advantages of simple structure, low manufacturing cost, safety, reliability and good practical effect.

Claims

1. The utility model provides a gravity evacuation formula convection bank, includes import collecting pipe (1), export collecting pipe (2) and installs a plurality of convection tubes (3) between import collecting pipe (1) and export collecting pipe (2), the one end of every convection tube (3) with import collecting pipe (1) is linked together, the other end of every convection tube (3) with export collecting pipe (2) are linked together, its characterized in that: the convection heat exchanger is characterized in that the inlet collecting pipe (1) and the outlet collecting pipe (2) are obliquely arranged relative to the horizontal direction, each convection pipe (3) is formed by connecting at least one pair of upper pipes (3-1) and lower pipes (3-2) which are arranged up and down, the upper pipes (3-1) are obliquely arranged upward relative to the horizontal direction, and the lower pipes (3-2) are obliquely arranged downward relative to the horizontal direction.

2. A gravity evacuated convection tube bundle as set forth in claim 1, wherein: the inlet collecting pipe (1) and the outlet collecting pipe (2) are arranged in an inclined manner of 2-5 degrees relative to the horizontal direction.

3. A gravity evacuated convection tube bundle as set forth in claim 2, wherein: the inlet collecting pipe (1) and the outlet collecting pipe (2) are inclined by 3 degrees relative to the horizontal direction.

4. A gravity evacuated convection tube bundle as set forth in claim 1, wherein: the upper pipe (3-1) is arranged by inclining upwards by 1-3 degrees relative to the horizontal direction, and the lower pipe (3-2) is arranged by inclining downwards by 1-3 degrees relative to the horizontal direction.

5. A gravity evacuated convection tube bundle as claimed in any one of claims 1 to 4, wherein: the upper pipe (3-1) and the lower pipe (3-2) are 2-10 pairs, and a supporting plate (4) is arranged between the upper pipe (3-1) and the lower pipe (3-2).