CN212390394U - Low-resistance and leakage-proof flue gas heater - Google Patents

Abstract

The utility model relates to a flue gas firing equipment field discloses a low resistance, prevent flue gas heater of leakage very much. This flue gas heater, frame casing including internally mounted heat transfer finned tube, its characterized in that: an inlet header connected with an inlet of the heat exchange finned tube is slidably mounted at one end of the outer frame shell, an outlet header connected with an outlet of the heat exchange finned tube is fixed at the other end of the outer frame shell, a steam inlet interface assembly is mounted on the inlet header, and a drainage interface assembly is mounted on the outlet header; the heat exchange finned tube is in an H-shaped finned tube structure, a base tube of the heat exchange finned tube is an elliptical tube, and the finned tube structure is in an H shape with a slit in the middle; the heat exchange finned tubes are arranged on the outer frame shell in a staggered mode, and the joints of the two ends of the heat exchange finned tubes and the inlet header and the outlet header are designed to be of claw-type structures. The utility model has the advantages of reasonable design, adopted oval heat exchange tube and "claw formula" connection structure, reduced the air current resistance, reinforce the heat transfer effect, effectively prevent to leak, have good result of use.

Description

Low-resistance and leakage-proof flue gas heater

(I) technical field

The utility model relates to a flue gas firing equipment field, in particular to low resistance, prevent flue gas heater of leakage.

(II) background of the invention

Most of the existing flue gas desulfurization devices of national coal-fired units adopt limestone-gypsum wet desulfurization (WFGD) technology, because the problems of serious corrosion, blockage of heat exchange elements and the like can occur in the actual operation process of a flue gas heat exchanger (GGH), the existing WFGD system cancels the GGH, and the purified flue gas after desulfurization is directly discharged from a chimney. The flue gas temperature at the inlet of the chimney is low, and the phenomena of 'gypsum rain' and 'white fog' are easily formed after the flue gas is discharged into the atmosphere. In order to avoid the phenomenon, some units adopt the technical measures of heating the flue gas and then discharging the flue gas, and the flue gas heater adopting the steam to heat the flue gas is a simpler and more effective scheme.

However, in the actual operation process, due to the defects of the structural design of the flue gas heater, cracking and leakage of the heat exchange tube are caused, the flue gas pressure loss of part of the heater is large, the corrosion and leakage of the heat exchange tube can cause the flue gas heater to be blocked, the resistance of the heat exchanger body is further increased (up to about 2000 Pa), the smoke exhaust pressure of a chimney is reduced, meanwhile, the heat exchange efficiency of the heat exchanger body is reduced, the temperature of the flue gas cannot meet the design requirement, the lifting height and the diffusion capacity of the flue gas are seriously influenced, the effects of reducing or eliminating the phenomena of ' gypsum rain ' and ' white fog ' are not achieved, and even the generation of the phenomena of the gypsum rain ' and.

In order to overcome the defects of leakage, large resistance, easy blockage, insufficient heat exchange capacity and the like of the flue gas heater, the heat exchanger body needs to be optimized and modified.

Disclosure of the invention

The utility model discloses a remedy prior art not enough, provide a structural design is reasonable, the heat transfer is effectual, low resistance, prevent the flue gas heater of leakage.

The utility model discloses a realize through following technical scheme:

the utility model provides a low resistance, prevent flue gas heater of leakage, includes the frame casing of internally mounted heat transfer finned tube, its characterized in that: an inlet header connected with an inlet of the heat exchange finned tube is slidably mounted at one end of the outer frame shell, an outlet header connected with an outlet of the heat exchange finned tube is fixed at the other end of the outer frame shell, a steam inlet interface assembly is mounted on the inlet header, and a drainage interface assembly is mounted on the outlet header; the heat exchange finned tube is in an H-shaped finned tube structure, a base tube of the heat exchange finned tube is an elliptical tube, and the finned tube structure is in an H shape with a slit in the middle; the heat exchange finned tubes are arranged on the outer frame shell in a staggered mode, and the joints of the two ends of the heat exchange finned tubes and the inlet header and the outlet header are designed to be of claw-type structures.

The utility model discloses in, the frame casing is as the outside bearing structure of whole heat exchanger, and the oval parent tube of heat transfer finned tube is compared with the pipe, has that intensity is big, flow resistance is little, coefficient of heat transfer is big, arrange advantages such as compact, heat transfer area are big, compare with ordinary steel pipe, and the bearing capacity of oval pipe is higher, is called "fine blood vessel in the industry"; the joint of the heat exchange finned tube and the inlet and outlet header is designed to be a claw type structure, the structure has triple special thermal expansion absorption functions, expansion differences caused by uneven thermal expansion among heat transfer tubes, between tubes and the header and between the header and a shell can be automatically absorbed, and the problems of welding line cracking, tube leakage and the like caused by the thermal expansion are avoided.

The utility model discloses a more excellent technical scheme does:

the inlet header is of a circular tube structure, the outlet header is of a semicircular tube structure, and a semicircular opening of the inlet header faces the outer frame shell, so that the inlet of heating steam and the drainage of condensed water are realized.

An intermediate supporting pipe is connected between the inlet header and the outlet header to support the inlet header and the outlet header, so that the strength of the whole heat exchanger is enhanced.

The heat exchange finned tube is fixed in the hole groove, and welded and fixed with the heat exchange finned tube and the outer frame shell.

The steam inlet interface assembly and the drainage interface assembly respectively comprise a connecting pipe, a supporting plate and a sealing piece, and the connecting pipes are connected with the inlet header/the outlet header.

The utility model has the advantages of reasonable design, adopted oval heat exchange tube and "claw formula" connection structure, reduced the air current resistance, reinforce the heat transfer effect, effectively prevent that the welding seam fracture from leaking in the operation, have good result of use.

(IV) description of the drawings

The present invention will be further described with reference to the accompanying drawings.

Fig. 1 is a schematic view of the structure of the present invention;

fig. 2 is a left side view structure diagram of the present invention;

FIG. 3 is a schematic view showing the arrangement of the heat exchange finned tube of the present invention;

FIG. 4 is a schematic front view of the heat exchange finned tube of the present invention;

fig. 5 is a left side view structure schematic diagram of the heat exchange finned tube of the utility model.

In the figure, 1 outer frame shell, 2 heat exchange finned tubes, 3 inlet headers, 4 outlet headers, 5 middle supporting tubes, 6 middle tube plates, 7 steam inlet interface components, 8 hydrophobic interface components, 9 base tubes and 10 fins.

(V) detailed description of the preferred embodiments

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings.

The attached drawing is a concrete embodiment of the utility model. The heat exchange finned tube type solar water heater comprises an outer frame shell 1 internally provided with a heat exchange finned tube 2, wherein one end of the outer frame shell 1 is slidably provided with an inlet header 3 connected with an inlet of the heat exchange finned tube 2, the other end of the outer frame shell is fixedly provided with an outlet header 4 connected with an outlet of the heat exchange finned tube 2, the inlet header 3 is provided with a steam inlet interface component 7, and the outlet header 4 is provided with a drainage interface component 8; the heat exchange finned tube 2 is in an H-shaped finned tube structure, a base tube 9 of the heat exchange finned tube is an elliptical tube, and a fin 10 structure is in an H shape with a slit in the middle; the heat exchange finned tubes 2 are arranged on the outer frame shell 1 in a staggered mode, and the joints of the two ends of the heat exchange finned tubes 2 and the inlet header 3 and the outlet header 4 are designed to be of claw-type structures.

In the specific design, the outer frame shell 1 is made of common channel steel and is made of low-temperature corrosion resistant 316L stainless steel; the base tube 9 of the heat exchange finned tube 2 is an elliptical tube, the fins 10 are H-shaped finned tubes with slots in the middle, the heat exchange finned tube has the characteristics of low airflow resistance, good heat exchange effect, wear resistance and the like, four rows of heat exchange finned tubes 2 are arranged in front and at the back along the flow direction of flue gas, and the heat exchange finned tubes 2 are arranged in a staggered mode, and airflow scours the heat exchange finned tubes 2 from the short sides of the elliptical tubes.

When the air flow speed is 12m/s, the air flow resistance of the elliptical tube is about 25 percent smaller than that of the circular tube with the equal section; when the air flow speed is 10m/s, the heat transfer coefficient of the elliptical tube heat exchanger is increased by about 30 percent compared with that of a circular tube heat exchanger; the elliptical tube has larger heat transfer perimeter and small thermal resistance in the tube, which is beneficial to the heat transfer of media in the tube, and meanwhile, the heat transfer area of the elliptical tube is larger than that of a circular tube under the same cross section area, so that the whole volume of the heat exchanger can be reduced; compared with the spiral finned tube, the H-shaped finned tube has the advantages of good wear resistance, difficult dust accumulation, small volume, small air flow resistance and the like, and the slit is arranged in the middle of the fin, so that the disturbance of air flow is further enhanced, and the heat exchange outside the tube is enhanced; considering that the flue gas heater is arranged in a desulfurization outlet flue, the working environment is severe, and 316L stainless steel or 2205 duplex stainless steel is selected as the material of the heat exchange finned tube 2.

The joint of the base tube 9 of the heat exchange finned tube 2 and the inlet header 3 and the outlet header 4 adopts a claw-type structure form with triple special thermal expansion absorption functions, so that expansion differences caused by uneven thermal expansion among heat transfer tubes, between tubes and headers and between headers and shells can be automatically absorbed, and the problems of weld cracking, tube leakage and the like caused by the thermal expansion are avoided.

The inlet header 3 is a round pipe type, the outlet header 4 is a semicircular pipe type, the outlet header 4 and the outer frame shell 1 are in full-welding connection firmly, the end is a fixed end, the inlet header 3 and the outer frame shell 1 are in slidable connection, the connection is realized through a connecting pipe in the steam inlet interface component 7, the end is a movable end, and the whole heat exchange pipe can freely expand towards the inlet end during operation; an intermediate supporting tube 5 is connected between the inlet header 3 and the outlet header 4, and each heat exchange tube is fixed through an intermediate tube plate 6 to ensure the space between each tube, the two sides of the intermediate tube plate 6 are welded with the outer frame shell 1, and meanwhile, the intermediate supporting tube 5 is welded with the intermediate tube plate 6.

The steam inlet interface component 7 is welded with the inlet header 3, the drain interface component 8 is welded with the outlet header 4, and the steam inlet interface component and the drain interface component are all in full-weld connection, so that the pressure-bearing strength of the equipment is ensured, and all components form a unified whole; the middle tube plate 6 is made of 316L stainless steel, and the middle supporting tube 5, the inlet header 3 and the outlet header 4 are made of 316L stainless steel; the steam inlet interface assembly 7 is used for inflow of steam, the drain interface assembly 8 is used for discharging condensed water and comprises a connecting pipe, a supporting plate, a sealing element and other assemblies, the connecting pipe is used for being connected with the inlet/outlet header, the supporting plate is used for fixing the interface assembly, and the sealing element is used for sealing the contact position of the connecting pipe and the outer frame shell 1 to ensure the tightness of the connecting pipe and the outer frame shell. The connecting pipe material chooses 316L stainless steel for use, and the backup pad material chooses Q235B for use, and the sealing member chooses polytetrafluoroethylene sealing filler.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned are only embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (5)

1. The utility model provides a low resistance, prevent flue gas heater of leakage, includes frame casing (1) of internally mounted heat transfer finned tube (2), its characterized in that: an inlet header (3) connected with an inlet of the heat exchange finned tube (2) is slidably mounted at one end of the outer frame shell (1), an outlet header (4) connected with an outlet of the heat exchange finned tube (2) is fixed at the other end of the outer frame shell, a steam inlet interface assembly (7) is mounted on the inlet header (3), and a drainage interface assembly (8) is mounted on the outlet header (4); the heat exchange finned tube (2) is in an H-shaped finned tube structure, a base tube (9) of the heat exchange finned tube is an elliptical tube, and the fin (10) is in an H-shaped structure with a slit in the middle; the heat exchange finned tubes (2) are arranged on the outer frame shell (1) in a staggered mode, and joints of the two ends of the heat exchange finned tubes (2) and the inlet header (3) and the outlet header (4) are designed to be of claw-type structures.

2. The low resistance, leak resistant flue gas heater of claim 1 wherein: the inlet header (3) is of a circular tube structure, the outlet header (4) is of a semicircular tube structure, and the semicircular opening of the inlet header faces the outer frame shell (1).

3. The low resistance, leak resistant flue gas heater of claim 1 wherein: an intermediate supporting pipe (5) is connected between the inlet header (3) and the outlet header (4).

4. The low resistance, leak resistant flue gas heater of claim 1 wherein: the heat exchanger is characterized in that a middle tube plate (6) is mounted on the outer frame shell (1), the middle tube plate (6) is a fixing plate with a hole groove, two ends of the fixing plate are fixed on the outer frame shell (1), and the heat exchange finned tube (2) is fixed in the hole groove.

5. The low resistance, leak resistant flue gas heater of claim 1 wherein: the steam inlet interface component (7) and the drainage interface component (8) respectively comprise a connecting pipe, a supporting plate and a sealing piece, and the connecting pipes are connected with the inlet header (3)/the outlet header (4).

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