Economizer for boiler

Abstract

A coal economizer for a boiler comprises a heat exchange cavity, a smoke leading-in channel is arranged on one side of the heat exchange cavity, and a smoke leading-out channel is arranged on the other side of the heat exchange cavity. A middle partition plate is arranged in the heat exchange cavity, a circulation cavity is formed in the heat exchange cavity on one side of the middle partition plate, a heat exchange pipeline cavity is formed in the other side of the middle partition plate, and a heat exchange pipeline is arranged in the heat exchange pipeline cavity; a switch controller used for controlling alternate opening and closing of the circulation cavity and the heat exchange pipeline cavity is arranged on the side, facing the smoke guiding-in channel, of the middle partition plate. The heat exchange pipeline cavity and the circulation cavity are separated through the middle partition plate, a structural foundation can be provided for cleaning of the heat exchange pipeline objectively, and by the adoption of the structure, tail gas can be automatically exhausted when the energy of the tail gas is low, and the problems of pipeline corrosion and the like are avoided.

Description

Technical Field

[0001] This application relates to an economizer for boilers. Background Technology

[0002] An economizer is a device installed at the tail end of a boiler to recover and preheat flue gas. It is generally used to preheat the boiler feedwater. Firstly, it can reduce the exhaust temperature of the flue gas, thus saving energy. Secondly, it can utilize low-grade heat for preheating, making full use of energy and improving the overall efficiency of the boiler.

[0003] The main problems with the economizers currently in use are twofold. One is that when the exhaust gas heat is low, condensation may cause pipe corrosion. The other is the cleaning issue. Currently, economizers are generally cleaned at operational nodes, but this will affect heat exchange efficiency in the later stages. Therefore, it is necessary to consider technical solutions that can perform online cleaning. Utility Model Content

[0004] To address the aforementioned problems, this application proposes an economizer for boilers, comprising a heat exchange chamber with a flue gas inlet channel on one side and a flue gas outlet channel on the other side. A central baffle is installed within the heat exchange chamber, with a flow chamber on one side and a heat exchange pipe chamber on the other, containing heat exchange pipes. A switch controller is located on the side of the central baffle facing the flue gas inlet channel to control the alternating opening and closing of the flow chamber and the heat exchange pipe chamber. This application uses a central baffle to separate the heat exchange pipe chamber and the flow chamber, objectively providing a structural basis for cleaning the heat exchange pipes. Furthermore, this structure allows for automatic removal of low-energy exhaust gas, preventing problems such as pipe corrosion.

[0005] Preferably, the switch controller includes a transverse partition, with a first flow channel on the side of the transverse partition facing the flow cavity and a second flow channel on the side facing the heat exchange pipe cavity; a slidable baffle is provided on one side of the transverse partition, the slidable baffle is connected to a drive piston rod, and the drive piston rod is configured to cooperate with a drive piston cylinder.

[0006] Preferably, it further includes a supporting baffle, and a sliding cavity for the sliding baffle to slide between the supporting baffle and the transverse partition. This application, by forming a sliding cavity for the sliding baffle through the supporting baffle and the transverse partition, can effectively limit its position, thereby ensuring a sealing effect on the flow cavity and the heat exchange pipe cavity.

[0007] Preferably, the heat exchange pipe includes a plurality of transverse heat exchange pipes arranged in a zigzag pattern, the transverse heat exchange pipes being connected by annular bends, and a plurality of vertically arranged heat exchange fins being provided on the transverse heat exchange pipes and the annular bends.

[0008] Preferably, the bottom horizontal heat exchange pipe is connected to the inlet pipe, and an inlet valve is installed on the inlet pipe; the top horizontal heat exchange pipe is connected to the outlet pipe, and an outlet valve is installed on the outlet pipe.

[0009] Preferably, it also includes a pulsed gas pipe, which is connected to the bottom of the heat exchange pipe cavity. By providing a pulsed gas pipe, this application allows for pulsed blowing after the heat exchange pipe cavity is closed by a sliding baffle, thereby initially purifying the heat exchange pipe and extending its service life under high heat exchange efficiency.

[0010] Preferably, the heat exchange cavity is provided with a tapered top channel; the top channel includes a first top cover plate communicating with the heat exchange cavity, a guide cone tube is provided on the first top cover plate, a second top cover plate is provided on the top of the guide cone tube, and the flue gas outlet channel is located in the middle of the second top cover plate.

[0011] This application can bring the following beneficial effects:

[0012] 1. This application uses a central baffle to separate the heat exchange pipe cavity and the flow cavity, which objectively provides a structural basis for cleaning the heat exchange pipe. Moreover, with this structure, when the exhaust gas energy is low, it can be automatically discharged, avoiding problems such as pipe corrosion.

[0013] 2. This application forms a sliding cavity for the sliding baffle by supporting baffles and transverse partitions, which can fully limit its position, thereby ensuring the sealing effect on the flow cavity and heat exchange pipe cavity.

[0014] 3. By setting up a pulsed gas pipeline, this application can perform pulsed blowing after the heat exchange pipeline cavity is closed by a sliding baffle, thereby initially purifying the heat exchange pipeline and extending the service life of the heat exchange pipeline under high heat exchange efficiency. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0016] Figure 1 This is a schematic diagram of the structure of this application.

[0017] Figure 2This is a schematic diagram of the structure when the flue gas inlet channel is closed in this application.

[0018] Figure 3 This is a schematic diagram of the heat exchange pipeline. Detailed Implementation

[0019] To clearly illustrate the technical features of this solution, the following detailed description, in conjunction with the accompanying drawings, will be provided.

[0020] In the first embodiment, such as Figure 1 As shown, an economizer for boilers includes a heat exchange chamber 1, with a flue gas inlet channel 2 on one side and a flue gas outlet channel 3 on the other side; a central partition 4 is provided inside the heat exchange chamber 1, with a flow chamber 5 on one side of the heat exchange chamber 1 and a heat exchange pipe cavity 6 on the other side, and a heat exchange pipe 7 is provided inside the heat exchange pipe cavity 6; a switch controller 8 is provided on the side of the central partition 4 facing the flue gas inlet channel 2 for controlling the alternating opening and closing of the flow chamber 5 and the heat exchange pipe cavity 6.

[0021] In use, flue gas is introduced through flue gas inlet channel 2. When heat exchange is required, it passes through heat exchange pipe cavity 6 and heat exchange is completed through heat exchange pipe 7. When the heat exchange efficiency decreases or the heat exchange operation time is reached, the switch controller 8 is used to close heat exchange pipe cavity 6 and open flow cavity 5. Then, the internal heat exchange pipe 7 of heat exchange pipe cavity 6 is cleaned. After cleaning, flow cavity 5 is closed and heat exchange pipe cavity 6 is opened to continue operation.

[0022] In the second embodiment, as Figure 1-3 As shown, an economizer for boilers includes a heat exchange chamber 1, with a flue gas inlet channel 2 on one side and a flue gas outlet channel 3 on the other side; a central partition 4 is provided inside the heat exchange chamber 1, with a flow chamber 5 on one side of the heat exchange chamber 1 and a heat exchange pipe cavity 6 on the other side, and a heat exchange pipe 7 is provided inside the heat exchange pipe cavity 6; a switch controller 8 is provided on the side of the central partition 4 facing the flue gas inlet channel 2 for controlling the alternating opening and closing of the flow chamber 5 and the heat exchange pipe cavity 6.

[0023] The switch controller 8 includes a transverse partition 9, with a first flow channel 10 on the side of the transverse partition 9 facing the flow cavity 5 and a second flow channel 11 on the side facing the heat exchange pipe cavity 6; a slidable baffle 12 is provided on one side of the transverse partition 9, the slidable baffle 12 is connected to a drive piston rod 13, and the drive piston rod 13 is configured to cooperate with a drive piston cylinder 14. It also includes a support baffle 15, and a sliding cavity 16 is formed between the support baffle 15 and the transverse partition 9 for the slidable baffle 12 to slide.

[0024] The heat exchange pipe 7 includes several transverse heat exchange pipes 17 arranged in a bend, which are connected by annular bends 18. Several vertically arranged heat exchange fins 19 are provided on the transverse heat exchange pipes 17 and the annular bends 18. The bottom transverse heat exchange pipe 17 is connected to the inlet pipe 20, which is equipped with an inlet valve 21; the top transverse heat exchange pipe 17 is connected to the outlet pipe 22, which is equipped with an outlet valve 23.

[0025] It also includes a pulse gas pipe 24, which is connected to the bottom of the heat exchange pipe cavity 6. The top of the heat exchange cavity 1 is provided with a tapered top channel; the top channel includes a first top cover plate 25 communicating with the heat exchange cavity 1, a guide cone pipe 26 is provided on the first top cover plate 25, a second top cover plate 27 is provided on the top of the guide cone pipe 26, and the flue gas outlet channel 3 is located in the middle of the second top cover plate 27.

[0026] In use, flue gas is introduced through flue gas inlet channel 2. When heat exchange is required, it passes through heat exchange pipe cavity 6. The inlet valve 21 and outlet valve 23 are opened, and heat exchange is completed through heat exchange pipe 7. When the heat exchange efficiency decreases or the heat exchange operation time is reached, the drive piston rod 13 of the switch controller 8 drives the sliding baffle 12 to slide inside, opening the first flow channel 10 and closing the second flow channel 11, that is, closing the heat exchange pipe cavity 6 and opening the flow cavity 5. Then the pulse gas pipe is opened to perform pulse gas blowing to clean the internal heat exchange pipe 7 of the heat exchange pipe cavity 6. After cleaning, the flow cavity 5 is closed and the heat exchange pipe cavity 6 is opened to continue the operation.

[0027] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. An economizer for boilers, characterized in that: It includes a heat exchange chamber, with a flue gas inlet channel on one side and a flue gas outlet channel on the other side; a central baffle is provided in the heat exchange chamber, with a flow chamber on one side of the central baffle and a heat exchange pipe chamber on the other side, and a heat exchange pipe installed in the heat exchange pipe chamber; a switch controller is provided on the side of the central baffle facing the flue gas inlet channel for controlling the alternating opening and closing of the flow chamber and the heat exchange pipe chamber.

2. The economizer for boilers as described in claim 1, characterized in that: The switch controller includes a transverse partition, with a first flow channel on the side of the transverse partition facing the flow cavity and a second flow channel on the side facing the heat exchange pipe cavity; a slidable baffle is provided on one side of the transverse partition, the slidable baffle is connected to a drive piston rod, and the drive piston rod is configured to cooperate with a drive piston cylinder.

3. The economizer for boilers as described in claim 2, characterized in that: It also includes a support baffle, and a sliding cavity is formed between the support baffle and the transverse partition for the sliding baffle to be slidably positioned.

4. The economizer for boilers as described in claim 1, characterized in that: The heat exchange pipeline includes several transverse heat exchange pipelines arranged in a zigzag pattern. The transverse heat exchange pipelines are connected by annular bends, and several vertically arranged heat exchange fins are provided on the transverse heat exchange pipelines and the annular bends.

5. An economizer for a boiler as described in claim 4, characterized in that: The bottom horizontal heat exchange pipe is connected to the inlet water pipe, and an inlet water valve is installed on the inlet water pipe; the top horizontal heat exchange pipe is connected to the outlet water pipe, and an outlet water valve is installed on the outlet water pipe.

6. The economizer for boilers as described in claim 1, characterized in that: It also includes a pulse gas pipeline, which is connected to the bottom of the heat exchange pipeline cavity.

7. An economizer for a boiler as described in claim 1, characterized in that: The heat exchange cavity is provided with a tapered top channel at the top; the top channel includes a first top cover plate that communicates with the heat exchange cavity, a guide cone tube is provided on the first top cover plate, a second top cover plate is provided on the top of the guide cone tube, and the flue gas outlet channel is located in the middle of the second top cover plate.

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