CN203115974U - Plate-shell-type coal economizer - Google Patents

Abstract

The utility model relates to a plate-shell economizer, which belongs to the technical field of power plant boiler waste heat recovery and energy-saving equipment, and comprises a corrugated plate heat exchange core (1), a heat exchanger shell (2), first and second water inlets and outlets Water tank (3, 3'), first and second flue gas inlet and outlet pipelines (4, 4'), wherein, the corrugated plate heat exchange core (1) is arranged in the heat exchanger shell (2) , the upper and lower ends of the front side of the corrugated plate heat exchange core (1) are respectively provided with first and second water inlet and outlet tanks (3, 3′), and the upper and lower sides of the corrugated plate heat exchange core (1) are provided with There are first and second flue gas inlet and outlet pipelines (4, 4'). The plate and shell economizer provided by the utility model solves the problem that the length of the water channel needs to be increased due to the large difference between the density of the flue gas and the water, and the water side temperature rise is not obvious. At the same time, the flue gas side corrugated channel increases the flow of the flue gas fluid The degree of turbulence improves the heat transfer efficiency, and it is not easy to be blocked by dust accumulation, and it is easy to clean even if it accumulates dust.

Description

A plate and shell economizer

technical field

The utility model belongs to the technical field of waste heat recovery and energy-saving equipment for power plant boilers, and relates to a plate and shell economizer.

Background technique

At present, the economizers used in power plant boilers are mainly tube type and finned tube type. The condensed water goes in the pipe, and the flue gas passes through the fan to blow the pipe to realize heat exchange. The cross-flow heat exchange is adopted between the flue gas and the condensed water. However, this kind of economizer has low compactness, consumes a large amount of pipes, and occupies a large area. Moreover, because the flue gas is in vertical contact with the heat exchange tubes, the flow resistance increases, dust is easy to accumulate, and the wear of the heat exchange tubes increases. The lifespan of the economizer.

In the prior art, the utility model patent whose patent publication number is CN202253576U provides a plate-type economizer for a utility boiler. In this patent, since the distance between the planar areas of the flue gas inlet and outlet plates is only half of the corrugation height, the flue gas inlet and outlet flow is affected and the flue gas resistance is increased. At the same time, the corrugated plates of the plate economizer are smooth and straight through. Although the flue gas resistance can be reduced, there are no enhanced heat transfer measures on the flue gas side, which will inevitably result in a low heat transfer coefficient on the flue gas side, which will inevitably lead to overall energy saving. The result of poor heat transfer effect of the coal burner. In addition, due to the large difference in density and heat transfer coefficient between flue gas and water, the temperature rise on the water side is not obvious. If the series connection of the water side is not considered, it can only be compensated by increasing the heat transfer area, which will inevitably increase the cost. The size and cost of the coal burner.

Utility model content

The purpose of the utility model is to solve the problem in the prior art that the flue gas and water density and heat transfer coefficient are too different, and the water side temperature rise is not obvious, and the length of the water channel needs to be increased, so as to provide a utility boiler plate and shell economizer .

The plate and shell economizer provided by the utility model has a compact structure, a large heat exchange area, and increases the turbulence of the flue gas fluid. Therefore, it has a good heat exchange effect, has a self-cleaning function, and is not easy to accumulate dust and scale. Low production cost.

In order to achieve the above object, the utility model adopts the following technical solutions:

A plate and shell economizer, comprising a corrugated plate heat exchange core, a heat exchanger shell, first and second water inlet and outlet water tanks, first and second flue gas inlet and outlet pipelines, wherein the corrugated The plate heat exchange core is arranged in the shell of the heat exchanger, the upper and lower ends of the front side of the corrugated plate heat exchange core are respectively provided with first and second water inlet and outlet water tanks, and the upper and lower sides of the corrugated plate heat exchange core are provided with There are first and second flue gas inlet and outlet pipelines.

The corrugated plate heat exchange core includes an end plate and several groups of plate bundles vertically inserted into the end plate at a certain distance, and the distance between adjacent plate bundles (5) is 0-100 mm.

The plate bundle is formed by superimposing a corrugated plate and its adjacent flipped corrugated plate. The crests of two adjacent corrugated plates are in contact with each other, and the two corrugated plates are sealed against the contacting parts. The space is formed with a tubular circulation channel. The sealing method is preferably laser welding and sealing, and the sealing line is a welding line.

Two adjacent sealing lines are equidistantly distributed on the plate bundle; one end of the sealing line is connected to the front or rear side of the plate bundle, and the distance between the other end and the rear or front end of the plate bundle is 0-100 mm. The reason why the sealing line is not connected to the front end or the rear end of the plate bundle at the same time is to form a tubular circulation channel in the middle.

The tubular circulation channel communicates with the first and second water inlet and outlet tanks, and the flow medium in the tubular circulation channel is water.

Adjacent plate bundles are placed horizontally and crossed, and the space formed between adjacent plate bundles is the shell side.

The flow medium in the tubular circulation channel is water, the flow medium in the shell side is flue gas, and the two media exchange heat in the form of cross flow, counter flow and cross flow.

The utility model has the advantages of:

(1) All the heat exchange surfaces of the medium in the heat exchange core are primary surfaces, the heat exchange efficiency is greatly improved, the structure is compact, and the floor space is small;

(2) The plate and shell economizer of this utility model not only maintains the characteristics of compact structure and high efficiency of the plate heat exchanger, but also has the characteristics of high temperature and high pressure resistance of the shell and tube heat exchanger, so that it has high heat transfer efficiency and pressure The loss is small, it is not easy to accumulate dust and block, and it is easy to clean even if it accumulates dust;

(3) Solved the problem that due to the large difference between the density of flue gas and water, the temperature rise of the water side is not obvious and requires multiple cycles or the length of the water channel needs to be increased.

(4) Dislocation and stacking between the plate bundles form shell-side channels, and the flue gas goes through the shell-side corrugated channels, which increases the turbulence of the flue gas fluid and improves the heat transfer efficiency;

(5) The plate and shell economizer of the utility model has small investment cost, low cost, simple production process, easy to form modules, and convenient installation.

Description of drawings

Fig. 1 is a structural schematic diagram of a plate and shell economizer in an embodiment of the utility model.

Fig. 2 is a vertical section view of the plate and shell economizer shown in Fig. 1 .

Fig. 3 is a schematic diagram of stacking plate bundles in the embodiment of the present invention.

Fig. 4 is a schematic diagram of the welding structure between the end plate and the plate bundle in the embodiment of the utility model.

Notes on drawings:

1 corrugated plate heat exchange core, 2 heat exchanger shell,

3, 3' the first and second water inlet and outlet tanks, 4, 4' the first and second flue gas inlet and outlet pipelines,

5 board bundles, 6 corrugated boards,

7 crests, 8 tubular circulation channels,

9 shells, 10 end plates.

Detailed ways

Further illustrate the utility model below in conjunction with accompanying drawing and embodiment.

As shown in Figure 1, a plate and shell economizer includes a corrugated plate heat exchange core 1, a heat exchanger shell 2, first and second water inlet and outlet tanks 3, 3', first and second smoke Gas inlet and outlet pipelines 4, 4', wherein the corrugated plate heat exchange core 1 is arranged in the heat exchanger shell 2, and the upper and lower ends of the front side of the corrugated plate heat exchange core 1 are respectively provided with first and second water inlets. The outlet water tanks 3, 3', and the upper and lower sides of the corrugated plate heat exchange core 1 are provided with first and second flue gas inlet and outlet pipelines 4, 4'.

The corrugated plate heat exchange core 1 includes an end plate 10 and several groups of plate bundles 5 vertically inserted into the end plate 10 at a certain interval, and the interval ranges from 0 to 100 mm.

As shown in Figures 2 and 3, the plate bundle 5 is formed by superimposing a corrugated plate 6 and its adjacent flipped corrugated plate 6, the crests of two adjacent corrugated plates 6 are in contact with each other, and the two corrugated plates are in contact with each other. The contact parts are sealed, and the space between adjacent sealing lines is formed with a tubular circulation channel 8 . The sealing method is preferably laser welding and sealing, and the sealing line is a welding line.

As shown in Figure 2, two adjacent sealing lines are equidistantly distributed on the plate bundle 5; one end of the sealing line is connected to the front or rear side of the plate bundle, and the distance from the other end to the rear end or front end of the plate bundle 5 is 0~100mm. The reason why the sealing line is not connected to the front end or the rear end of the plate bundle 5 at the same time is to form the middle tubular circulation channel 8 .

The tubular circulation channel 8 communicates with the first and second water inlet and outlet tanks 3, 3', and the flow medium in the tubular circulation channel 8 is water.

Adjacent plate bundles 5 are placed horizontally and crossed, and the space formed between adjacent plate bundles 5 is the shell side 9 .

The flow medium in the tubular circulation channel 8 is water, and the flow medium in the shell side 9 is flue gas, and the two mediums exchange heat in the form of cross flow, counter flow and cross flow.

Referring to FIG. 4 , the plate bundle 5 is vertically inserted into the end plate 10 , and then the core body 1 is installed on the heat exchanger shell 2 and sealed by argon arc welding.

The above description of the embodiments is for those of ordinary skill in the technical field to understand and apply the utility model. It is obvious that those skilled in the art can easily make various modifications to these embodiments, and apply the general principles described here to other embodiments without creative effort. Therefore, the utility model is not limited to the embodiments here, and improvements and modifications made by those skilled in the art according to the disclosure of the present invention without departing from the scope of the utility model should be within the protection scope of the utility model.

Claims (7)

1. A plate and shell economizer, characterized in that it includes a corrugated plate heat exchange core (1), a heat exchanger shell (2), first and second water inlet and outlet tanks (3, 3'), The first and second flue gas inlet and outlet pipelines (4, 4'), wherein the corrugated plate heat exchange core (1) is arranged in the heat exchanger shell (2), and the corrugated plate heat exchange core ( 1) The upper and lower ends of the front side are respectively provided with the first and second water inlet and outlet water tanks (3, 3′), and the upper and lower sides of the corrugated plate heat exchange core (1) are provided with the first and second flue gas tanks. Inlet and outlet pipelines (4, 4'). 2. The plate and shell economizer according to claim 1, characterized in that: the corrugated plate heat exchange core (1) includes an end plate (10) and several groups are vertically inserted into the end plate at a certain interval ( 10) of the plate bundles (5), the distance between adjacent plate bundles (5) is 0-100mm. 3. The plate and shell economizer according to claim 2, characterized in that: the plate bundle (5) is formed by superimposing a corrugated plate (6) and an adjacent flipped corrugated plate (6) , the crests of two adjacent corrugated plates (6) are in contact with each other, and the two corrugated plates are sealed against the contacting parts, and the space between adjacent sealing lines is formed with a tubular circulation channel (8). 4. The plate and shell economizer according to claim 3, characterized in that: two adjacent sealing lines are equidistantly distributed on the plate bundle (5); one end of the sealing line is connected to the front or rear of the plate bundle The sides are connected, and the distance between the other end and the rear end or front end of the plate bundle (5) is 0-100mm. 5. The plate and shell economizer according to claim 3, characterized in that: the tubular circulation channel (8) communicates with the first and second water inlet and outlet tanks (3, 3'), and the tubular circulation channel (8) The flowing medium inside is water. 6. The plate and shell economizer according to claim 2, characterized in that: the adjacent plate bundles (5) are placed horizontally and crossed, and the space formed between adjacent plate bundles (5) is the shell side (9 ). 7. The panel-shell economizer according to claim 6, characterized in that: the shell side (9) is connected to the flue gas inlet and outlet pipeline (5), and the flow medium in the shell side (9) is smoke.

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