CN203298332U - External glass lining tubular air preheater - Google Patents

Abstract

The utility model belongs to the technical field of air preheating equipment, and in particular relates to an outer glass-lined tubular air preheater, comprising: a first tube plate with a plurality of first through holes arranged vertically on the plate body, and a first tube plate arranged opposite to it The second tube plate, the plate body is provided with a second through hole corresponding to each first through hole; on the same side of the first tube plate and the second tube plate, a first box closely connected with the two is provided plate; the second box plate arranged on the opposite side of the first box plate and closely connected with the first tube plate and the second tube plate; The preheater tubes in the area surrounded by the two box plates, each preheater tube passes through a first through hole and a second through hole corresponding to it, and its two ends are respectively connected to the first tube plate and the second through hole. The tube plate is fixedly connected; because the outer surface of the tube is coated with a glass layer, and the tube body adopts a threaded tube, the problems of poor corrosion resistance, poor heat exchange effect and short service life of the existing tubular air preheater are solved.

Description

External glass-lined tubular air preheater

technical field

The utility model belongs to the technical field of air preheating equipment, in particular to a glass-lined tube type air preheater.

Background technique

The air preheater is a heat exchange device that uses the heat of the flue gas at the tail of the boiler to heat the air required for fuel combustion to improve the efficiency of the boiler. It is composed of many thin-walled steel pipes and steel plates. During operation, the flue gas goes inside the pipe, and the air goes outside the pipe (or the flue gas goes outside the pipe, and the air goes inside the pipe), and the preheater tube that absorbs the heat of the flue gas transfers the heat to the air, so that the air before entering the boiler is preheated to A certain temperature, thereby improving the heat exchange performance of the boiler and reducing energy consumption.

At present, ordinary light tube air preheaters are widely used in petroleum, metallurgy, chemical and other fields due to their simple structure, convenient use and installation, and low cost. However, their preheating efficiency and service life are not ideal, especially in recent years. , Due to the tight supply of fuel resources and the high sulfur content in coal, the sulfur content in the flue gas of the boiler increases, which intensifies the corrosion of the air preheater and greatly shortens the service life of the equipment.

Utility model content

The purpose of the utility model is to provide a glass-lined tubular air preheater, aiming to solve the problems of poor corrosion resistance, poor heat exchange effect and short service life of the existing tubular air preheater.

The utility model is achieved in this way, an outer glass-lined tubular air preheater, the outer glass-lined tubular air preheater includes: a first tube plate arranged in a vertical direction, the first tube plate A plurality of first through holes are provided on the plate body; a second tube plate opposite to the first tube plate is provided, and a second tube plate is provided on the plate body of the second tube plate corresponding to each of the first through holes. Two through holes;

The first box plate arranged on the same side of the first tube plate and the second tube plate, the first box plate is closely connected with the first tube plate and the second tube plate; The second box plate on the opposite side of the first box plate, the second box plate is closely connected with the first tube plate and the second tube plate;

Several preheater tubes are connected between the first tube sheet and the second tube sheet, and the plurality of preheater tubes are arranged on the first tube sheet, the second tube sheet, and the second tube sheet. In the area surrounded by a box plate and the second box plate, each of the preheater tubes respectively passes through one of the first through holes and the corresponding second through holes, and the two ends They are respectively fixedly connected with the first tube sheet and the second tube sheet, and the preheater tube includes a threaded pipe body, and the outer surface of the threaded pipe body is coated with a glass layer.

As an improvement, the two ends of the preheater tube are welded to the first tube sheet and the second tube sheet respectively.

As an improvement, several of the first through holes are all set as first stepped holes, and some of the second through holes are all set as second stepped holes, and the small hole ends of the first stepped holes are connected to the second stepped holes. The small hole ends of the stepped holes are opposite to each other, each of the preheater tubes respectively passes through one of the first stepped holes and the corresponding second stepped hole, and the two ends of the preheater tubes are respectively connected to the A graphite sealing ring is provided between the large hole end of the first stepped hole and the large hole end of the second stepped hole.

As an improvement, the thickness of the glass layer is 0.2mm-0.3mm.

Due to the adoption of the above technical scheme, the beneficial effects obtained by the utility model are: when the outer glass-lined tube air preheater is used, it is installed horizontally, the air passes through the preheater tube installed in the horizontal direction, and the flue gas passes through the preheater tube The space between the preheater tube and the preheater tube is passed through. Since the outer surface of the preheater tube is coated with a glass layer, the corrosion resistance of sulfuric acid and other acidic substances can be used to solve the sulfur corrosion problem of the flue gas and improve the air quality. The service life of the preheater; because the hardness of glass is higher than that of steel, the outer surface of the tube can be coated with a glass layer to greatly improve the wear resistance of the preheater tube; the surface of the glass layer is smooth, which is 20 times that of the steel surface times, it is not easy to ash, and the pollution thermal resistance coefficient is smaller than that of ordinary steel pipes, and the resistance of flue gas flow is small, which saves energy in long-term operation; The exchange capacity improves the preheating efficiency, and the use of threaded tubes in the preheating equipment can reduce the overall size of the heat exchange equipment, reduce material consumption, and save investment.

Description of drawings

Fig. 1 is the schematic diagram of the front view of the outer glass-lined tubular air preheater provided by the first embodiment of the utility model;

Fig. 2 is a top view structural diagram of the glass-lined tubular air preheater provided by the first embodiment of the utility model;

Fig. 3 is a schematic sectional view along line A-A in Fig. 1;

Fig. 4 is a front structural schematic view of the glass-lined tubular air preheater provided by the second embodiment of the present invention;

Fig. 5 is a schematic sectional view along line B-B in Fig. 4;

Among them: 1. First tube plate, 2. Second tube plate, 3. Preheater tube, 4. First box plate, 5. Second box plate, 6. Glass layer, 7. Solder joint, 8 , Graphite sealing ring.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

first embodiment

It can be seen from Fig. 1, Fig. 2 and Fig. 3 that the outer glass-lined tubular air preheater includes: a first tube plate 1 arranged in a vertical direction, and the plate body of the first tube plate 1 is provided with a plurality of first passages. Holes; the second tube plate 2 arranged opposite to the first tube plate 1, the plate body of the second tube plate 2 is provided with a second through hole corresponding to each first through hole;

The first box plate 4 arranged on the same side of the first tube plate 1 and the second tube plate 2, the first box plate 4 is closely connected with the first tube plate 1 and the second tube plate 2 respectively; The second box plate 5 on the opposite side of the box plate 4, the second box plate 5 is closely connected with the first tube plate 1 and the second tube plate 2 respectively;

Several preheater tubes 3 are connected between the first tube sheet 1 and the second tube sheet 2, and the several preheater tubes 3 are all arranged on the first tube sheet 1, the second tube sheet 2, and the first box plate 4. and the second box plate 5, each preheater tube 3 passes through a first through hole and a second through hole corresponding to it, and the two ends of the preheater tube 3 are connected to the first through hole respectively. The tube sheet 1 and the second tube sheet 2 are connected by welding, and the welding spots 7 are left after welding. In this embodiment, the preheater tube 3 includes a threaded pipe body, and the outer surface of the threaded pipe body is coated with a glass layer 6 , the thickness of the glass layer 6 is 0.2mm˜0.3mm.

In this embodiment, the outer glass-lined tube air preheater is installed horizontally, air passes through the preheater tube installed in the horizontal direction, and the flue gas passes through the space between the preheater tube and the preheater tube. Through, because the outer surface of the preheater tube is coated with a glass layer, the sulfur corrosion problem of the flue gas can be solved by using the corrosion resistance of sulfuric acid and other acidic substances of the glass, and the service life of the air preheater is improved; because the glass The hardness of the preheater tube is higher than that of steel, and the outer surface of the tube can be coated with a glass layer, which can greatly improve the wear resistance of the preheater tube; the surface of the glass layer is smooth, 20 times that of the steel surface, and it is not easy to accumulate dust, which is better than ordinary steel pipes. The pollution thermal resistance coefficient is small, the flue gas circulation resistance is small, and the long-term operation is energy-saving; the pipe body adopts threaded pipe, and the pipe of the same length has a larger heat exchange area, which enhances the heat exchange capacity with the air and improves the preheating efficiency. The use of threaded tubes for preheating equipment can reduce the overall size of heat exchange equipment, reduce material consumption, and save investment.

second embodiment

As can be seen from Fig. 4 and Fig. 5, this embodiment is basically the same as the first embodiment, the differences are:

The first through hole on the plate body of the first tube plate 1 is set as a first stepped hole, the second through hole on the second tube plate 2 is set as a second stepped hole, and the small hole end of the first stepped hole is connected to the second stepped hole. The small hole ends of the stepped holes are arranged oppositely, and each preheater tube 3 respectively passes through a first stepped hole and the corresponding second stepped hole, and the two ends of the preheater tube 3 are connected to the large hole end of the first stepped hole respectively. 1. A graphite sealing ring 8 is arranged between the large hole ends of the second stepped hole.

In this embodiment, the two ends of the preheater tube and the first tube sheet and the second tube sheet are sealed with graphite sealing rings, which facilitates assembly, disassembly and replacement of damaged preheater tubes.

The outer glass-lined tubular air preheater provided by the utility model includes: a first tube plate arranged in a vertical direction, and a plurality of first through holes are arranged on the plate body of the first tube plate; The second tube plate, the plate body of the second tube plate is provided with a second through hole corresponding to each first through hole; the first box plate is arranged on the same side of the first tube plate and the second tube plate , the first box plate is tightly connected with the first tube plate and the second tube plate; the second box plate arranged on the opposite side of the first box plate is connected with the first tube plate, The second tube sheet is tightly connected; a number of preheater tubes are connected between the first tube sheet and the second tube sheet, and the plurality of preheater tubes are all arranged on the first tube sheet, the second tube sheet, and the first box plate and the second box plate, each preheater tube passes through a first through hole and its corresponding second through hole, and the two ends of the preheater tube are respectively connected to the first tube plate, The second tube plate is fixedly connected; when the outer glass-lined tube air preheater is used, it is installed horizontally, the air passes through the preheater tube installed in the horizontal direction, and the flue gas passes through the gap between the preheater tube and the preheater tube. Space through, because the outer surface of the preheater tube is coated with a glass layer, using the characteristics of glass corrosion resistance to sulfuric acid and other acidic substances, it can solve the problem of sulfur corrosion in the flue gas and improve the service life of the air preheater; The hardness of glass is higher than that of steel, and the outer surface of the tube can be coated with glass layer, which can greatly improve the wear resistance of the preheater tube; the surface of the glass layer is smooth, 20 times that of steel, and it is not easy to accumulate dust, which is better than ordinary The pollution thermal resistance coefficient of the steel pipe is small, the smoke flow resistance is small, and the long-term operation is energy-saving; the pipe body adopts a threaded pipe, and the pipe of the same length has a larger heat exchange area, which enhances the heat exchange capacity with the air and improves the preheating efficiency , The use of threaded tubes in preheating equipment can reduce the overall size of heat exchange equipment, reduce material consumption, and save investment.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (4)

1. The outer glass-lined tubular air preheater is characterized in that the outer glass-lined tubular air preheater comprises: a first tube plate arranged in a vertical direction, and a plate body of the first tube plate is provided with There are a number of first through holes; a second tube plate opposite to the first tube plate, and a second through hole is provided on the plate body of the second tube plate corresponding to each of the first through holes; The first box plate arranged on the same side of the first tube plate and the second tube plate, the first box plate is closely connected with the first tube plate and the second tube plate; The second box plate on the opposite side of the first box plate, the second box plate is closely connected with the first tube plate and the second tube plate; Several preheater tubes are connected between the first tube sheet and the second tube sheet, and the plurality of preheater tubes are arranged on the first tube sheet, the second tube sheet, and the second tube sheet. In the area surrounded by a box plate and the second box plate, each of the preheater tubes respectively passes through one of the first through holes and the corresponding second through holes, and the two ends They are respectively fixedly connected with the first tube sheet and the second tube sheet, and the preheater tube includes a threaded pipe body, and the outer surface of the threaded pipe body is coated with a glass layer. 2 . The outer glass-lined tube air preheater according to claim 1 , characterized in that, the two ends of the preheater tube are welded to the first tube sheet and the second tube sheet respectively. 3 . 3. The outer glass-lined tube air preheater according to claim 1, characterized in that, some of the first through holes are all set as first stepped holes, and some of the second through holes are all set as second stepped holes. Stepped holes, the small hole end of the first stepped hole is opposite to the small hole end of the second stepped hole, each of the preheater tubes passes through one of the first stepped holes and the corresponding Referring to the second stepped hole, graphite sealing rings are provided between the two ends of the preheater tube and the large hole end of the first stepped hole and the large hole end of the second stepped hole respectively. 4. The outer glass-lined tubular air preheater according to any one of claims 1 to 3, characterized in that the thickness of the glass layer is 0.2mm-0.3mm.

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