CN206274230U - A kind of superconduction fluidised form heat exchanger - Google Patents

Abstract

The utility model discloses a superconducting flow state heat exchanger, which belongs to the field of heat exchange and includes a frame, the frame is divided into upper and lower layers, the upper layer is set as a water side frame, and the side is to be installed on the smoke Outside the flue, the lower layer is set as a flue gas side frame, which is installed inside the flue, and a water inlet header is provided between the water side frame and the flue gas side frame, and a protection box is installed around the water inlet header. The cover is connected with the frame; several columns of light pipes are arranged perpendicular to the water inlet header in the frame, and the light pipes are closed pipes that are not connected with the water inlet header. The heat exchange working medium is preferably acetone or methanol. The light pipe in the water side frame is covered with an outer pipe, and there is water in the space between the light pipe and the outer pipe and communicates with the water inlet header. A water outlet header is provided on the top of the water side frame, and the water outlet header communicates with the space between the light pipe and the outer pipe.

Description

A superconducting fluid heat exchanger

technical field

The utility model relates to the field of heat exchange, in particular to a superconducting flow state heat exchanger.

Background technique

The average thermal efficiency of industrial coal-fired boilers is only 67%, and 25% of the heat energy is discharged into the atmosphere through the flue gas. The exhaust gas temperature is as high as 200°C, which not only pollutes the environment, but also wastes valuable waste heat resources of flue gas. Therefore, many large boilers are equipped with shell-and-tube economizers made of cast iron or stainless steel, which are used to recover waste heat from flue gas and preheat boiler feed water.

However, due to the high sulfur content of coal, sulfur oxides are usually produced during combustion, and sulfuric acid vapor is formed when combined with water vapor. When the metal tube wall temperature of the economizer is lower than the condensation point of sulfuric acid vapor (called acid dew point), liquid sulfuric acid (called condensation) will form on its surface.

For a long time, traditional shell-and-tube economizers often suffer from corrosion and even perforation caused by condensation, which seriously affects the operation safety of boilers. Therefore, current boilers alleviate condensation and corrosion by increasing the exhaust gas temperature. Generated, the flue gas temperature remains high. In addition, this type of economizer is bulky, has a large flue gas resistance, is prone to ash accumulation and clogging, reduces heat transfer efficiency year by year, has a short service life, and often needs to be cleaned. Therefore, small and medium-sized boilers are rarely used, and large boilers are used for a period of time. Finally, due to the serious ash accumulation and ash blockage, it is basically not used, and the high-temperature flue gas is allowed to take away heat and waste energy. Every 15-18°C drop in boiler flue gas temperature can increase boiler efficiency by 1%. Therefore, reducing boiler flue gas temperature has become an important way to save energy for boilers. At the same time, the problem of low-temperature corrosion of heat exchange tubes must be solved. Therefore, heat pipe economizers It is born by application.

The current heat pipe economizer mostly uses radial heat pipes, and its structure is as follows: multiple radial heat pipe elements are placed horizontally in the flue formed by the economizer shell, and each branch in the same horizontal (or vertical) plane The heat pipe elements form a row; the two ends of the inner tubes of the heat pipes protrude from the housing, and the corresponding inner tubes of the heat pipes in the adjacent row or one row apart are connected in series through a seamless elbow; one end of the first and last row of heat pipes is not connected to the bend The headers are connected in series, but they are connected in parallel through headers as a whole. The flue gas flows through the flue through the vertical radial heat pipes, the water flows into one side of the header, and evenly flows into the first row (or last row) of heat pipes connected to the header, then flows through each heat exhaust pipe in turn, and finally from the other side flow out. The flue gas is in contact with the outer tube and fins of the heat pipe, and is completely separated from the inner tube of the heat pipe; the welding seam between the two ends of the inner tube of the heat pipe and the seamless elbow is also completely outside the flue.

The above-mentioned structure has the following disadvantages: 1. The size of the header is relatively large, generally Φ800, which makes it difficult to manufacture and install; 2. After the flue gas side leaks, the entire pipe must be replaced, resulting in increased maintenance costs and difficult maintenance. A superconducting fluidic heat exchanger is designed for the above disadvantages, but there is no such device on the market at present.

Contents of the invention

For the problems existing in the prior art, the utility model provides a superconducting fluid heat exchanger, which improves the heat exchange efficiency and reduces production, installation and operation costs by changing the pipe structure on the water side and the flue gas side.

In order to achieve the above object, the technical scheme adopted by the utility model is as follows: a superconducting fluid state heat exchanger includes a frame, the frame is divided into upper and lower layers, the upper layer is set as a water side frame, and the lower layer Set as a flue gas side frame, a water inlet header is provided between the water side frame and the flue gas side frame, and a protective cover is provided around the water inlet header and connected to the frame;

Several rows of light pipes are arranged in the frame vertically to the water inlet header, heat exchange working medium is arranged in the light pipes, and outer pipes are placed over the light pipes in the water side frame, and the distance between the light pipes and the outer pipes is There is water in the space between and communicates with the water inlet header, and the water outlet header is arranged on the top of the water side frame, and the water outlet header communicates with the space between the light pipe and the outer pipe.

As a preferred technical solution, fins are provided on the light pipes in the flue gas side frame.

As a preferred technical solution, the light pipes and fins in the flue gas side frame are attached with enamel.

As a preferred technical solution, the light pipe adopts a Φ42*3 pipe, and the outer pipe adopts a Φ89*6 pipe.

As a preferred technical solution, the frame is provided with lifting lugs for easy disassembly and installation.

The benefits of this utility model are:

1. Change the traditional water inlet header to a common header, which reduces the size and reduces the difficulty of production and installation.

2. After the light pipe on the flue gas side leaks, only the light pipe on the flue gas side needs to be replaced, reducing operation and maintenance costs.

3. After the internal structure of the heat exchanger is changed, the heat exchange efficiency is improved, and the module production can be realized according to the heat exchange efficiency, which reduces the cost.

4. The enamel treatment of the light pipe and fins on the flue gas side can also improve its service life.

Description of drawings

Fig. 1 is the overall structural diagram of a kind of superconducting fluid state heat exchanger;

Fig. 2 is a top view of a superconducting fluidic heat exchanger;

Fig. 3 is a partially sectional enlarged view of a superconducting fluid state heat exchanger.

In the figure: 1-frame, 2-flue gas side frame, 3-water inlet header, 4-water side frame, 5-water outlet header, 6-outer pipe, 7-protective cover, 8-light pipe.

detailed description

In order to facilitate the understanding of those skilled in the art, the utility model will be further described below in conjunction with the accompanying drawings.

As shown in Figures 1 to 3, a superconducting fluid heat exchanger includes a frame 1, which is provided with lifting lugs for easy disassembly and installation, and the frame 1 is used to support the internal heat exchange tubes. The frame 1 is divided into upper and lower layers. The upper layer is set as the water side frame 4, which is installed outside the flue, and the lower layer is set as the flue gas side frame 2, which is installed inside the flue. A water inlet header 3 is provided between the water side frame 4 and the flue gas side frame 2, and the water inlet header 3 is surrounded by a protective cover 7 and connected to the frame 1;

The frame 1 is provided with several rows of light pipes 8 perpendicular to the water inlet header 3, the light pipes 8 are pipes of Φ42*3, and the light pipes 8 are closed pipes that are not connected with the water inlet header 3. The light pipe 8 is provided with a heat exchange medium, the heat exchange work medium is preferably acetone or methanol, the light pipe 8 in the water side frame 4 is covered with an outer pipe 6, and the outer pipe 6 adopts Φ89*6 There is water in the space between the light pipe 8 and the outer pipe 6 and communicates with the water inlet header 3, the top of the water side frame 4 is provided with a water outlet header 5, and the water outlet header 5 It communicates with the space between the light pipe 8 and the outer pipe 6 .

The light pipe 8 in the smoke side frame 2 is provided with fins, and the light pipe 8 and the fin in the smoke side frame 2 are attached with enamel, which can increase its service life.

Specific installation and heat transfer process:

During installation, the flue gas side frame 2 at the lower part of the water inlet header 3 is installed inside the flue, and the water side frame 4 at the upper part of the water inlet header 3 is installed outside the flue. When working, the high-temperature flue gas passes through the flue gas side frame 2, the heat exchange working medium in the light pipe 8 evaporates, moves to the upper part of the light pipe 8 and enters the light pipe 8 in the water side frame 4, because the light pipe in the water side frame 4 Cooling water flows in the space between 8 and the outer pipe 6, so the heat exchange working medium in the light pipe 8 will condense and flow into the light pipe 8 of the flue gas side frame 2, and reciprocate heat exchange.

It should be understood that these examples are only used to illustrate the utility model and are not intended to limit the protection scope of the utility model. In addition, it should also be understood that after reading the technical content of the utility model, those skilled in the art can make various changes, modifications and/or variations to the utility model, and all these equivalent forms also fall within the scope of the appended rights of the application. within the scope of protection defined in the request.

Claims (5)

1. a kind of superconduction fluidised form heat exchanger, including framework, it is characterised in that：The framework is divided into upper and lower two-layer, and the upper strata sets It is water body side frame, the lower floor is set to flue gas body side frame, is provided between the water body side frame and flue gas body side frame into water header, institute State and protective cover is provided with into around water header and is connected with framework；

Several columns light pipe is provided with perpendicular to water inlet header in the framework, heat-exchange working medium, the water side frame are provided with the light pipe Outer tube is cased with outside light pipe in frame, is had water in the space between the light pipe and outer tube and is connected with the water inlet header, it is described Water body side frame top is provided with water outlet header, and the water outlet header and the space between light pipe and outer tube connect.

2. a kind of superconduction fluidised form heat exchanger according to claim 1, it is characterised in that：Light pipe in the flue gas body side frame It is provided with fin.

3. a kind of superconduction fluidised form heat exchanger according to claim 2, it is characterised in that：Light pipe in the flue gas body side frame Has enamel with fin.

4. a kind of superconduction fluidised form heat exchanger according to claim 1, it is characterised in that：The light pipe uses the pipe of Φ 42*3 Son, the outer tube uses the pipe of Φ 89*6.

5. a kind of superconduction fluidised form heat exchanger according to claim 1, it is characterised in that：The framework is provided with convenient dismounting The hanger of installation.