An external horizontal heat exchanger system that is resistant to low-temperature corrosion

Abstract

The utility model relates to an external horizontal heat exchanger system that is resistant to low-temperature corrosion, and belongs to the field of waste heat boilers for glass kilns. The utility model includes a water-to-water heat exchanger, a first connecting pipe, a second connecting pipe, a water-to-water heat exchanger tube-side pipeline, and a water-to-water heat exchanger shell-side pipeline. The first economizer inlet header and the second economizer outlet header are connected through the first connecting pipe; the second economizer inlet header and the third economizer outlet header are connected through the second connecting pipe; the water-to-water heat exchanger tube-side pipeline is connected to the water-to-water heat exchanger, and the third economizer inlet header is connected to the water-to-water heat exchanger tube-side pipeline; the second economizer outlet header is connected to the water-to-water heat exchanger through the water-to-water heat exchanger shell-side pipeline; one end of the water-to-water heat exchanger shell-side pipeline is connected to the water-to-water heat exchanger, and the other end of the water-to-water heat exchanger shell-side pipeline is connected to the first connecting pipe. The utility model has a simple and reasonable structural design, is safe and reliable, is environmentally friendly and energy-saving, and is resistant to low-temperature corrosion, and meets the use requirements.

Description

Technical Field

[0001] The utility model relates to a system, in particular to an external horizontal heat exchanger system which is resistant to low-temperature corrosion and belongs to the field of waste heat boilers for glass kilns. Background Art

[0002] During the production process of glass melting furnace, a large amount of high-temperature exhaust gas is generated. The supporting waste heat boiler is used to absorb the heat in the high-temperature exhaust gas to generate steam for power generation. Because the flue gas emitted by the glass melting furnace contains a large amount of acidic gases such as SO2, it will cause acid corrosion to the low-temperature section of the waste heat boiler. Therefore, it is necessary to control the medium temperature in the low-temperature section heating surface to be higher than the acid dew point temperature to avoid acid corrosion and increase the service life of the boiler.

[0003] Therefore, it is particularly necessary to provide a heat exchanger system with simple and reasonable structural design, environmental protection, energy saving, and resistance to low-temperature corrosion. Utility Model Content

[0004] The purpose of the utility model is to overcome the above-mentioned deficiencies in the prior art and to provide an external horizontal heat exchanger system which has a simple and reasonable structural design, is safe and reliable, is environmentally friendly and energy-saving, and is resistant to low-temperature corrosion.

[0005] The technical solution adopted by the utility model to solve the above problems is: the external horizontal heat exchanger system resistant to low-temperature corrosion includes a first economizer outlet header, a first economizer inlet header, a second economizer outlet header, a second economizer inlet header, a third economizer outlet header and a third economizer inlet header, characterized in that it also includes a water-to-water heat exchanger, a first connecting pipe, a second connecting pipe, a water-to-water heat exchanger tube-side pipeline and a water-to-water heat exchanger shell-side pipeline, the first economizer inlet header and the second economizer outlet header are connected to each other. The boxes are connected by a first connecting pipe; the second economizer inlet header and the third economizer outlet header are connected by a second connecting pipe; the water-to-water heat exchanger tube-side pipeline is connected to the water-to-water heat exchanger, and the third economizer inlet header is connected to the water-to-water heat exchanger tube-side pipeline; the second economizer outlet header is connected to the water-to-water heat exchanger through a water-to-water heat exchanger shell-side pipeline; one end of the water-to-water heat exchanger shell-side pipeline is connected to the water-to-water heat exchanger, and the other end of the water-to-water heat exchanger shell-side pipeline is connected to the first economizer inlet header with the first connecting pipe.

[0006] Preferably, the utility model further comprises an electric regulating valve group, and the electric regulating valve group is arranged on the first connecting pipe, so that the hot water flow can be easily adjusted.

[0007] Preferably, a heater heat transfer tube is provided in the water-to-water heat exchanger of the utility model, and the heater heat transfer tube is made of S304408 stainless steel tube; and splicing is not allowed.

[0008] Preferably, the water-to-water heat exchanger of the present invention is a horizontal water-to-water heat exchanger, which is arranged outside the furnace and has detachable end caps at both ends.

[0009] Compared with the prior art, the utility model has the following advantages and effects: 1) the device is external, with a simple and reasonable overall structural design. It is not arranged in the boiler and is an independent device, which can be disassembled separately for easy maintenance and replacement; 2) an electric regulating valve group is arranged on the pipeline, which can easily adjust the hot water flow; 3) the heat transfer tube of the serpentine tube heater adopts S304408 stainless steel tube, and splicing is not allowed, so the service life is long; 4) a bypass is arranged on the tube pipeline, and if the water-to-water heat exchanger is not put into operation, the boiler feed water can also directly enter the economizer; 5) the boiler feed water is heated to above the acid dew point to avoid corrosion of the low temperature section of the boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a system schematic diagram of an embodiment of the utility model.

[0011] In the figure: the first economizer outlet header 1, the first economizer inlet header 2, the second economizer outlet header 3, the second economizer inlet header 4, the third economizer outlet header 5, the third economizer inlet header 6, the water-to-water heat exchanger 7, the first connecting pipe 8, the second connecting pipe 9, the water-to-water heat exchanger tube-side pipeline 10, the water-to-water heat exchanger shell-side pipeline 11, the electric regulating valve group 12, and the medium-pressure boiler feed water Z. DETAILED DESCRIPTION

[0012] The present invention will be further described in detail below with reference to the accompanying drawings and through examples. The following examples are provided to explain the present invention, but the present invention is not limited to the following examples.

[0013] Example

[0014] See also Figure 1The external horizontal heat exchanger system for preventing low temperature corrosion in this embodiment comprises a first economizer outlet header 1, a first economizer inlet header 2, a second economizer outlet header 3, a second economizer inlet header 4, a third economizer outlet header 5 and a third economizer inlet header 6, a water-to-water heat exchanger 7, a first connecting pipe 8, a second connecting pipe 9, a water-to-water heat exchanger tube-side pipeline 10 and a water-to-water heat exchanger shell-side pipeline 11. The first economizer inlet header 2 is connected to the second economizer outlet header 3 through the first connecting pipe 8; the second economizer outlet header 3 is connected to the first economizer outlet header 3 through the first connecting pipe 8; the second economizer outlet header 4 is connected to the second economizer outlet header 5 through the first connecting pipe 8; the second economizer outlet header 5 is connected to the second economizer outlet header 3 through the first connecting pipe 8; the second economizer outlet header 5 is connected to the second economizer outlet header 3 through the first connecting pipe 8; the second economizer outlet header 5 is connected to the second economizer outlet header 3 through the first connecting pipe 8; the second economizer outlet header 5 is connected to the second economizer outlet header 3 through the first connecting pipe 8; the second economizer outlet header 5 is connected to the second economizer outlet header 6 ... The economizer inlet header 4 is connected to the third economizer outlet header 5 through the second connecting pipe 9; the water-to-water heat exchanger tube-side pipe 10 is connected to the water-to-water heat exchanger 7, and the third economizer inlet header 6 is connected to the water-to-water heat exchanger tube-side pipe 10; the second economizer outlet header 3 is connected to the water-to-water heat exchanger 7 through the water-to-water heat exchanger shell-side pipe 11; one end of the water-to-water heat exchanger shell-side pipe 11 is connected to the water-to-water heat exchanger 7, and the other end of the water-to-water heat exchanger shell-side pipe 11 is connected to the first economizer inlet header 2 with the first connecting pipe 8.

[0015] In this embodiment, an electric regulating valve group 12 is arranged on the first connecting pipe 8; the electric regulating valve group 12 is used to adjust the flow of hot water entering the shell-side pipeline 11 of the water-to-water heat exchanger.

[0016] In this embodiment, a heater heat transfer tube is arranged in the water-to-water heat exchanger 7. The serpentine tube heater heat transfer tube adopts S304408 stainless steel tube, and splicing is not allowed, so the service life is long.

[0017] In this embodiment, the water-to-water heat exchanger 7 is a horizontal water-to-water heat exchanger 7 .

[0018] In this embodiment, the high-pressure boiler feed water Z enters the water-to-water heat exchanger tube side pipe 10, then enters the first economizer inlet header 2, the second economizer outlet header 3 is connected to the water-to-water heat exchanger shell side pipe 11 through a pipeline, and then connected to the first connecting pipe 8, finally forming a cycle; the second economizer sends hot water into the water-to-water heat exchanger shell side, the boiler feed water in the water-to-water heat exchanger tube side, making it greater than the acid dew point temperature, and then enters the economizer to prevent corrosion of the low-temperature section of the boiler.

[0019] The device in this embodiment is external, with a simple and reasonable structural design. It is not installed in the boiler and is an independent device that can be disconnected separately for easy maintenance and replacement.

[0020] Through the above description, those skilled in the art can already implement it.

[0021] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the utility model. All equivalent changes or simple changes made based on the structure, features and principles described in the patent concept of the utility model are included in the protection scope of the utility model patent. Technicians in the technical field of the utility model can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should all fall within the protection scope of the utility model.

Claims

1. An external horizontal heat exchanger system resistant to low-temperature corrosion, comprising a first economizer outlet header (1), a first economizer inlet header (2), a second economizer outlet header (3), a second economizer inlet header (4), a third economizer outlet header (5) and a third economizer inlet header (6), characterized in that: The invention also comprises a water-to-water heat exchanger (7), a first connecting pipe (8), a second connecting pipe (9), a water-to-water heat exchanger tube-side pipeline (10) and a water-to-water heat exchanger shell-side pipeline (11); the first economizer inlet header (2) and the second economizer outlet header (3) are connected via the first connecting pipe (8); the second economizer inlet header (4) and the third economizer outlet header (5) are connected via the second connecting pipe (9); the water-to-water heat exchanger tube-side pipeline (10) and the shell-side pipeline (11) are connected via the second connecting pipe (9); ) is connected to the water-to-water heat exchanger (7), the third economizer inlet header (6) is connected to the water-to-water heat exchanger tube-side pipeline (10); the second economizer outlet header (3) is connected to the water-to-water heat exchanger (7) through the water-to-water heat exchanger shell-side pipeline (11); one end of the water-to-water heat exchanger shell-side pipeline (11) is connected to the water-to-water heat exchanger (7), and the other end of the water-to-water heat exchanger shell-side pipeline (11) is connected to the first economizer inlet header (2) through the first connecting pipe (8).

2. The low-temperature corrosion-resistant external horizontal heat exchanger system according to claim 1, characterized in that: It also comprises an electric regulating valve group (12), wherein the first connecting pipe (8) is provided with the electric regulating valve group (12).

3. The low-temperature corrosion-resistant external horizontal heat exchanger system according to claim 1, characterized in that: A heater heat transfer tube is arranged in the water-to-water heat exchanger (7), and the heater heat transfer tube is made of S304408 stainless steel tube.

4. The low-temperature corrosion-resistant external horizontal heat exchanger system according to claim 1 or 3, characterized in that: The water-to-water heat exchanger (7) is a horizontal water-to-water heat exchanger (7).

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