Flue gas waste heat buffer output device

Abstract

The utility model provides a flue gas waste heat buffer output device, include: shell, inside is equipped with vertical baffle, vertical baffle divides the high temperature heat storage room and heat exchange chamber of setting up side by side in shell portion, be provided with flue gas flow regulation unit on vertical baffle, flue gas flow regulation unit includes the gate that can vertically lift and is used for driving gate to lift the actuating mechanism, be provided with ceramic honeycomb heat accumulator in high temperature heat storage room, be provided with vertical tube -shell heat exchanger in heat exchange chamber, include multiple vertical setting heat exchange pipe, cold air supply unit, cold air supply unit includes air blower, with the bottom of multiple heat exchange pipe's cold air inlet header, and with the top of multiple heat exchange pipe's hot air outlet header, air blower links to each other cold air inlet header, the utility model discloses through high temperature heat storage room to the fluctuation's flue gas carries out the peak clipping, then by flue gas flow regulation unit control enters the hot flue gas flow of heat exchange chamber, realizes the stable control to heat exchange process.

Description

Technical Field

[0001] This utility model relates to a flue gas waste heat utilization device, specifically a flue gas waste heat buffer output device, belonging to the field of flue gas waste heat recovery and utilization technology. Background Technology

[0002] In industries such as steel metallurgy, high-temperature flue gases such as sintering machine exhaust and annular cooler waste gas contain enormous waste heat resources, and their recovery and utilization are important ways for enterprises to save energy and reduce consumption. However, a common problem with these industrial flue gases is that their temperature and flow rate fluctuate drastically, which is determined by the periodic changes in upstream production processes. Existing waste heat recovery systems, such as directly connected waste heat boilers or heat exchangers, are prone to unstable heat exchange loads when facing such fluctuating heat sources, making it difficult to maintain consistent quality of the generated steam or hot water, thus affecting the stable operation of downstream heat-using equipment. Furthermore, to cope with peak heat loads, the design capacity of waste heat recovery equipment must have a large margin, which leads to low operating efficiency during low-load periods and wasteful investment. Utility Model Content

[0003] Based on the above background, the purpose of this utility model is to provide a flue gas waste heat buffer output device to solve the technical problem of unstable operation and low efficiency of waste heat utilization system caused by flue gas parameter fluctuations in the prior art.

[0004] To achieve the above-mentioned objectives, this utility model provides the following technical solution:

[0005] A flue gas waste heat buffer output device includes:

[0006] The outer shell has a heat-insulating structure, and the interior of the outer shell is provided with a vertical partition, which divides the interior of the outer shell into a high-temperature heat storage chamber and a heat exchange chamber arranged side by side;

[0007] A flue gas flow regulating unit is provided on the vertical partition, the flue gas flow regulating unit includes a vertically lifting gate and an actuator for driving the gate to lift.

[0008] A ceramic honeycomb-shaped heat storage body is disposed in the high-temperature heat storage chamber;

[0009] A vertical shell-and-tube heat exchanger is provided in the heat exchange chamber. The vertical shell-and-tube heat exchanger includes multiple vertically arranged heat exchange tubes. The outer space of the heat exchange tubes is configured as the shell side for the flow of flue gas, and the inner space of the heat exchange tubes is configured as the tube side for the flow of air.

[0010] A cold air supply unit is provided outside the housing. The cold air supply unit includes a blower, a cold air inlet manifold connected to the bottom of multiple heat exchange tubes, and a hot air outlet manifold connected to the top of multiple heat exchange tubes. The blower is connected to the cold air inlet manifold.

[0011] Preferably, the ceramic honeycomb heat storage body has channels that extend through it along its height and are arranged in parallel to each other, and the cross-section of the channels is honeycomb-shaped.

[0012] The honeycomb-shaped parallel straight-through channel structure ensures both a large specific surface area for efficient heat storage and low resistance to flue gas flow.

[0013] Preferably, the ceramic honeycomb heat storage body is formed by stacking multiple ceramic honeycomb heat storage standard modules along the vertical and / or horizontal directions.

[0014] The standard module stacking method facilitates manufacturing, transportation and on-site installation, and the number of modules can be flexibly increased or decreased according to different flue gas treatment volumes.

[0015] Preferably, the vertical shell-and-tube heat exchanger further includes an upper tube sheet and a lower tube sheet, with both ends of the heat exchange tubes fixed to the upper tube sheet and the lower tube sheet, respectively.

[0016] Preferably, the actuator includes a motor, a reducer driven by the motor, and a lead screw and nut assembly driven by the reducer, wherein the nut end of the lead screw and nut assembly is connected to the top of the gate.

[0017] Preferably, the flue gas waste heat buffer output device further includes a flue gas inlet pipe and a flue gas outlet pipe, wherein the flue gas inlet pipe is connected to the bottom of the high-temperature heat storage chamber, and the flue gas outlet pipe is connected to the bottom of the heat exchange chamber.

[0018] Preferably, the outer shell includes an inner lining layer, an insulation layer, and an outer steel plate layer arranged sequentially from the inside out.

[0019] Preferably, the bottom of the housing is also provided with a support frame for supporting the housing.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] This utility model discloses a flue gas waste heat buffer output device. It uses a high-temperature heat storage chamber with large heat capacity to smooth out the peaks and fill the valleys of flue gas fluctuations. Then, the flow rate of hot flue gas entering the heat exchange chamber is controlled by the flue gas flow regulation unit to achieve stable control of the heat exchange process. This enables the downstream system to provide high-quality hot air with relatively constant temperature and flow rate. In the heat exchange chamber, cold air flows from bottom to top in the tube side, while hot flue gas flows from top to bottom in the shell side, forming a counter-current heat exchange mode, achieving a large heat exchange temperature difference and high energy recovery efficiency. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the main structure of a flue gas waste heat buffer output device according to the present invention;

[0024] Figure 2 This is a top view schematic diagram of a flue gas waste heat buffer output device according to the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the ceramic honeycomb heat storage standard module in this utility model;

[0026] In the diagram: 10. Outer shell; 101. Inner lining; 102. Insulation layer; 103. Outer shell steel plate layer; 20. Vertical partition; 30. High-temperature heat storage chamber; 40. Heat exchange chamber; 50. Flue gas flow regulation unit; 501. Gate; 502. Actuator; 5021. Motor; 5022. Reducer; 5023. Screw and nut assembly; 60. Ceramic honeycomb heat storage body; 601. Ceramic honeycomb heat storage standard module; 70. Vertical shell-and-tube heat exchanger; 701. Heat exchange tube; 702. Upper tube sheet; 703. Lower tube sheet; 80. Cold air supply unit; 801. Blower; 802. Cold air inlet main pipe; 803. Hot air outlet main pipe; 90. Flue gas inlet pipe; 100. Flue gas outlet pipe; 110. Support frame. Detailed Implementation

[0027] The technical solution of this utility model will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings. It should be understood that the implementation of this utility model is not limited to the following embodiments, and any modifications and / or alterations made to this utility model will fall within the protection scope of this utility model.

[0028] In this invention, unless otherwise specified, all parts and percentages are by weight, and the equipment and raw materials used are commercially available or commonly used in the field. Unless otherwise specified, the methods in the following embodiments are conventional methods in the field. Unless otherwise specified, the components or equipment in the following embodiments are general standard parts or components known to those skilled in the art, and their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0029] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the following detailed description, many specific details are set forth to facilitate explanation and provide a comprehensive understanding of the embodiments of the present invention. However, one or more embodiments may be practiced by those skilled in the art without these specific details.

[0030] like Figure 1 and Figure 2 As shown, an embodiment of this utility model discloses a flue gas waste heat buffer output device, including a shell 10 with a heat preservation structure, a flue gas flow regulating unit 50, a ceramic honeycomb heat storage body 60, a vertical shell-and-tube heat exchanger 70, and a cold air supply unit 80.

[0031] The outer casing 10 has a vertical partition 20 inside, which divides the interior of the outer casing 10 into a high-temperature heat storage chamber 30 and a heat exchange chamber 40 arranged side by side. The high-temperature heat storage chamber 30 is used for heat buffering, and the heat exchange chamber 40 is used for heat exchange. The outer casing 10 includes an inner lining layer 101, an insulation layer 102, and an outer casing steel plate layer 103 arranged sequentially from the inside to the outside. The bottom of the outer casing 10 is also provided with a support frame 110 for supporting the outer casing 10.

[0032] The flue gas flow regulating unit 50 is mounted on the vertical partition 20. The flue gas flow regulating unit 50 includes a vertically movable gate 501 and an actuator 502 for driving the gate 501 to move up and down. Specifically, the actuator 502 is an electric actuator 502, including a motor 5021, a reducer 5022 connected to the output shaft of the motor 5021, and a lead screw and nut assembly 5023 that is driven by the reducer 5022. The nut end of the lead screw and nut assembly 5023 is firmly connected to the upper part of the gate 501. By controlling the forward and reverse rotation of the motor 5021, the gate 501 can be driven to move up or down, thereby adjusting the size of the opening between the two chambers.

[0033] A ceramic honeycomb-shaped heat storage element 60 is disposed within a high-temperature heat storage chamber 30. The ceramic honeycomb-shaped heat storage element 60 is composed of multiple stacked ceramic honeycomb-shaped standard heat storage modules 601. For example... Figure 3 As shown, each ceramic honeycomb heat storage standard module 601 has a large number of parallel channels running along its height and having a honeycomb-shaped cross-section. This structure allows the ceramic honeycomb heat storage body 60 to maintain low flue gas flow resistance while having a large heat transfer specific surface area. The ceramic honeycomb heat storage body 60 is made of ceramic materials that are resistant to high temperatures, corrosion, and thermal shock.

[0034] A vertical shell-and-tube heat exchanger 70 is disposed within a heat exchange chamber 40. The vertical shell-and-tube heat exchanger 70 includes multiple vertically arranged heat exchange tubes 701. The outer space of the heat exchange tubes 701 is configured as the shell side for flue gas flow, and the inner space of the heat exchange tubes 701 is configured as the tube side for air flow. The vertical shell-and-tube heat exchanger 70 also includes an upper tube sheet 702 and a lower tube sheet 703, with both ends of the heat exchange tubes 701 fixed to the upper tube sheet 702 and the lower tube sheet 703, respectively.

[0035] The cold air supply unit 80 is located outside the housing 10. The cold air supply unit 80 includes a blower 801, a cold air inlet main pipe 802 connected to the bottom of multiple heat exchange tubes 701, and a hot air outlet main pipe 803 connected to the top of multiple heat exchange tubes 701. The blower 801 is connected to the cold air inlet main pipe 802.

[0036] The working principle of the flue gas waste heat buffer output device is as follows.

[0037] High-temperature flue gas from the upstream sintering or cooling process, with its temperature and flow rate fluctuating dramatically, enters the bottom of the high-temperature regenerator 30 through the flue gas inlet pipe 90. The flue gas flows upward through the dense channels of the ceramic honeycomb regenerator 60. During this process, a large amount of heat energy carried by the flue gas is absorbed and stored by the regenerator with a huge heat capacity, the temperature peak of the flue gas is smoothed out, and the flow pulse is also buffered.

[0038] The downstream heat demand is used to send a command to the actuator 502 of the flue gas flow regulation unit 50. This command can be issued by an externally installed control system. The motor 5021 that receives the command drives the gate 501 to open to a specific height, so that the buffered high-temperature flue gas enters the heat exchange chamber 40 stably from the top of the high-temperature heat storage chamber 30 at a relatively constant flow rate.

[0039] Upon entering the heat exchange chamber 40, the high-temperature flue gas flows downwards through the shell side of the vertical shell-and-tube heat exchanger 70. Simultaneously, the blower 801 of the cold air supply unit 80 delivers ambient-temperature air into the tube side of the heat exchange tubes 701, with the air flowing upwards. In this way, the hot flue gas and the cold air form a counter-current heat exchange.

[0040] After sufficient heat exchange with the high-temperature flue gas, the cold air is heated into high-temperature, high-quality hot air with a stable flow rate. It is then output from the hot air outlet manifold 803 and can be directly used for processes such as preheating combustion air, achieving high efficiency and energy saving. The low-temperature flue gas after heat exchange is discharged from the bottom of the heat exchange chamber 40 through the flue gas outlet pipe 100 and enters the subsequent processes.

[0041] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A flue gas waste heat buffer output device, characterized by: The flue gas waste heat buffer output device includes: The outer shell (10) has a heat-insulating structure. The interior of the outer shell (10) is provided with a vertical partition (20). The vertical partition (20) divides the interior of the outer shell (10) into a high-temperature heat storage chamber (30) and a heat exchange chamber (40) arranged side by side. A flue gas flow regulating unit (50) is provided on the vertical partition (20). The flue gas flow regulating unit (50) includes a vertically lifting gate (501) and an actuator (502) for driving the gate (501) to lift. A ceramic honeycomb heat storage body (60) is disposed in the high-temperature heat storage chamber (30); A vertical shell-and-tube heat exchanger (70) is provided in the heat exchange chamber (40). The vertical shell-and-tube heat exchanger (70) includes a plurality of vertically arranged heat exchange tubes (701). The outer space of the heat exchange tubes (701) is configured as the shell side for the flow of flue gas, and the inner space of the heat exchange tubes (701) is configured as the tube side for the flow of air. A cold air supply unit (80) is provided outside the outer casing (10). The cold air supply unit (80) includes a blower (801), a cold air inlet manifold (802) connected to the bottom of multiple heat exchange tubes (701), and a hot air outlet manifold (803) connected to the top of multiple heat exchange tubes (701). The blower (801) is connected to the cold air inlet manifold (802).

2. A flue gas waste heat buffer output device according to claim 1, characterized in that: The ceramic honeycomb heat storage body (60) has channels that extend through it along its height and are arranged in parallel to each other, and the cross-section of the channels is honeycomb-shaped.

3. The flue gas waste heat buffer output device according to claim 1, characterized in that: The ceramic honeycomb heat storage body (60) is formed by stacking multiple ceramic honeycomb heat storage standard modules (601) in the vertical and / or horizontal directions.

4. The flue gas waste heat buffer output device according to claim 1, characterized in that: The vertical shell-and-tube heat exchanger (70) also includes an upper tube sheet (702) and a lower tube sheet (703), with the two ends of the heat exchange tube (701) fixed to the upper tube sheet (702) and the lower tube sheet (703) respectively.

5. The flue gas waste heat buffer output device according to claim 1, characterized in that: The actuator (502) includes a motor (5021), a reducer (5022) that is drivenly connected to the motor (5021), and a lead screw and nut assembly (5023) that is drivenly connected to the reducer (5022). The nut end of the lead screw and nut assembly (5023) is connected to the top of the gate (501).

6. The flue gas waste heat buffer output device according to claim 1, characterized in that: The flue gas waste heat buffer output device also includes a flue gas inlet pipe (90) and a flue gas outlet pipe (100). The flue gas inlet pipe (90) is connected to the bottom of the high temperature heat storage chamber (30), and the flue gas outlet pipe (100) is connected to the bottom of the heat exchange chamber (40).

7. The flue gas waste heat buffer output device according to claim 1, characterized in that: The outer shell (10) includes an inner lining layer (101), an insulation layer (102), and an outer shell steel plate layer (103) arranged sequentially from the inside to the outside.

8. The flue gas waste heat buffer output device according to claim 1, characterized in that: The bottom of the outer shell (10) is also provided with a support frame (110) for supporting the outer shell (10).

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