Boiler flue gas constant wall temperature heat exchange device

Abstract

The utility model discloses a boiler flue gas constant wall temperature heat exchange device which comprises a shell, a flue gas inlet pipe and a flue gas outlet pipe are arranged at the two ends of the shell respectively, a heat pipe exchanger is fixedly arranged on the outer wall of the shell in a penetrating mode, a water inlet of the heat pipe exchanger is fixedly connected with a water inlet pipe, and a variable frequency pump and a third temperature sensor are installed on the water inlet pipe. By arranging the variable frequency pump, the flow of a heat exchange medium in the heat pipe exchanger can be adjusted, so that the water outlet temperature of the heat pipe exchanger is improved, the temperature of the heat exchange surface of the heat pipe exchanger is always higher than the acid dew point temperature of flue gas, and sulfuric acid steam in the flue gas is prevented from being dewed on the surface of the heat pipe exchanger; the surface of the heat pipe exchanger is prevented from being corroded; through the arrangement of the ash removal mechanism, dust attached to the surface of the heat pipe exchanger can be removed by starting the ash removal mechanism regularly, so that the device is prevented from being blocked due to ash deposition, and the heat exchange efficiency of the heat pipe exchanger is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas treatment, in particular to a boiler flue gas constant wall temperature heat exchange device. Background Art

[0002] Flue gas heat exchanger is a common equipment in industrial production, which is used to recover the waste heat in the flue gas and transfer it to other media. The flue gas heat exchanger can effectively recover the waste heat of the flue gas, improve energy utilization, thereby reducing energy consumption and achieving energy conservation and emission reduction.

[0003] However, due to the high humidity and dust content of boiler flue gas, the flue gas heat exchanger is prone to dust accumulation, blockage and corrosion after a period of use, which affects the life of the equipment.

[0004] Therefore, we propose a boiler flue gas constant wall temperature heat exchange device. Utility Model Content

[0005] The utility model aims to provide a boiler flue gas constant wall temperature heat exchange device to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A boiler flue gas constant wall temperature heat exchange device comprises a shell with a smoke inlet pipe and a smoke outlet pipe respectively arranged at two ends, a heat pipe heat exchanger is fixedly penetrated through the outer wall of the shell, a water inlet of the heat pipe heat exchanger is fixedly connected to a water inlet pipe, a frequency conversion pump and a third temperature sensor are installed on the water inlet pipe, a water outlet of the heat pipe heat exchanger is fixedly connected to a water outlet pipe, a fourth temperature sensor is installed on the water outlet pipe, and a dust cleaning mechanism for the heat pipe heat exchanger is installed on the shell.

[0008] As a further solution of the utility model: a valve and a flow meter are also installed on the water inlet pipe, and the variable frequency pump, the valve, the third temperature sensor and the flow meter are distributed in sequence along the medium flow direction of the water inlet pipe.

[0009] As a further solution of the utility model: a first temperature sensor is provided through the outer wall of the air inlet of the smoke inlet pipe, and a second temperature sensor is provided through the outer wall of the air outlet of the smoke outlet pipe.

[0010] As a further solution of the utility model: the cleaning mechanism includes a compressed gas storage tank fixedly mounted on the outer wall of the shell by a bracket, an electromagnetic pulse valve is fixedly mounted on the air outlet of the compressed gas storage tank, at least one purge pipe is fixedly mounted above the heat pipe exchanger in the shell, and the air inlet end of the purge pipe is fixedly connected to the air outlet end of the electromagnetic pulse valve, and a plurality of duckbill nozzles are fixedly mounted on the purge pipe toward the outer wall of the heat pipe exchanger.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] The utility model can adjust the flow rate of the heat exchange medium in the heat pipe heat exchanger by arranging a variable frequency pump, thereby increasing the outlet water temperature of the heat pipe heat exchanger, and then making the temperature of the heat exchange surface of the heat pipe heat exchanger always higher than the acid dew point temperature of the flue gas, so as to avoid condensation of sulfuric acid vapor in the flue gas on the surface of the heat pipe heat exchanger, thereby avoiding corrosion of the surface of the heat pipe heat exchanger; by utilizing the arrangement of the cleaning mechanism, the dust attached to the surface of the heat pipe heat exchanger can be cleaned by regularly starting the cleaning mechanism, thereby avoiding blockage of the device due to dust accumulation and ensuring the heat exchange efficiency of the heat pipe heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The figure is a schematic diagram of the structure of a boiler flue gas constant wall temperature heat exchange device.

[0014] Among them, the shell 1, the smoke inlet pipe 2, the smoke outlet pipe 3, the first temperature sensor 4, the second temperature sensor 5, the heat pipe heat exchanger 6, the water inlet pipe 7, the frequency conversion pump 8, the valve 9, the third temperature sensor 10, the flow meter 11, the water outlet pipe 12, the fourth temperature sensor 13, the bracket 14, the compressed gas storage tank 15, the electromagnetic pulse valve 16, the purge pipe 17, and the duckbill nozzle 18. DETAILED DESCRIPTION

[0015] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention will be further described in detail in conjunction with the embodiments below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0016] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0017] It should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation in the specification, and therefore cannot be understood as a limitation on the present invention.

[0018] In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0019] See also Figure 1 In an embodiment of the utility model, a boiler flue gas constant wall temperature heat exchange device comprises a shell 1 with a smoke inlet pipe 2 and a smoke outlet pipe 3 respectively arranged at both ends, a heat pipe heat exchanger 6 is fixedly penetrated through the outer wall of the shell 1, a water inlet of the heat pipe heat exchanger 6 is fixedly connected with a water inlet pipe 7, a variable frequency pump 8 and a third temperature sensor 10 are installed on the water inlet pipe 7, a water outlet of the heat pipe heat exchanger 6 is fixedly connected with a water outlet pipe 12, a fourth temperature sensor 13 is installed on the water outlet pipe 12, and a dust cleaning mechanism for the heat pipe heat exchanger 6 is installed on the shell 1.

[0020] The utility model adopts the above scheme and utilizes the third temperature sensor 10 to detect the inlet water temperature of the heat pipe heat exchanger 6. The fourth temperature sensor 13 is used to detect the outlet water temperature of the heat pipe heat exchanger 6, so that the heat exchange amount of the heat pipe heat exchanger 6 can be calculated according to the difference between the inlet and outlet water temperatures, and the operating power of the variable frequency pump 8 can be adjusted to adjust the flow rate of the heat exchange medium, thereby increasing the outlet water temperature of the heat pipe heat exchanger 6, and then making the temperature of the heat exchange surface of the heat pipe heat exchanger 6 always higher than the acid dew point temperature of the flue gas by 15-20°C, so as to avoid condensation of sulfuric acid vapor in the flue gas on the surface of the heat pipe heat exchanger 6, thereby avoiding corrosion of the surface of the heat pipe heat exchanger 6;

[0021] By utilizing the setting of the cleaning mechanism and regularly starting the cleaning mechanism, the dust attached to the surface of the heat pipe heat exchanger 6 can be cleaned, thereby avoiding blockage of the device due to dust accumulation and ensuring the heat exchange efficiency of the heat pipe heat exchanger 6.

[0022] Specific combination Figure 1 In one embodiment of the utility model, a valve 9 and a flow meter 11 are also installed on the water inlet pipe 7, and the variable frequency pump 8, valve 9, third temperature sensor 10 and flow meter 11 are distributed in sequence along the medium flow direction of the water inlet pipe 7.

[0023] By providing the flow meter 11 , it is convenient to monitor the flow of the water inlet pipe 7 , thereby making it more convenient to control the medium flow of the heat pipe heat exchanger 6 by adjusting the power of the variable frequency pump 8 .

[0024] Specific combination Figure 1 In one embodiment of the utility model, a first temperature sensor 4 is provided through the outer wall of the air inlet of the smoke inlet pipe 2 , and a second temperature sensor 5 is provided through the outer wall of the air outlet of the smoke outlet pipe 3 .

[0025] By providing the first temperature sensor 4 and the second temperature sensor 5 , the smoke inlet temperature and the smoke outlet temperature of the housing 1 can be monitored.

[0026] Specific combination Figure 1 In one embodiment of the utility model, the cleaning mechanism includes a compressed gas storage tank 15 fixedly mounted on the outer wall of the shell 1 through a bracket 14, the air inlet of the compressed gas storage tank 15 is connected to the air compressor through a pipeline, and the air outlet of the compressed gas storage tank 15 is fixedly installed with an electromagnetic pulse valve 16, and at least one purge pipe 17 is fixedly installed above the heat pipe exchanger 6 in the shell 1, and the air inlet end of the purge pipe 17 is fixedly connected to the air outlet end of the electromagnetic pulse valve 16, and the purge pipe 17 is fixedly installed with a plurality of duckbill nozzles 18 facing the outer wall of the heat pipe exchanger 6.

[0027] By setting up the compressed gas storage tank 15, the electromagnetic pulse valve 16 and the purge pipe 17, after starting the electromagnetic pulse valve 16, the high-pressure gas in the compressed gas storage tank 15 can be input into the purge pipe 17, and then sprayed toward the heat pipe exchanger 6 by each duckbill nozzle 18, so as to utilize the high-speed airflow to impact and purge the surface sprayed toward the heat pipe exchanger 6, so as to make the dust attached to the surface of the heat pipe exchanger 6 fall off, so as to realize the cleaning of the heat pipe exchanger 6.

[0028] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A boiler flue gas constant wall temperature heat exchange device, characterized in that: The invention comprises a shell (1) having a smoke inlet pipe (2) and a smoke outlet pipe (3) respectively arranged at two ends, a heat pipe heat exchanger (6) being fixedly arranged through the outer wall of the shell (1), a water inlet of the heat pipe heat exchanger (6) being fixedly connected to a water inlet pipe (7), a variable frequency pump (8) and a third temperature sensor (10) being installed on the water inlet pipe (7), a water outlet of the heat pipe heat exchanger (6) being fixedly connected to a water outlet pipe (12), a fourth temperature sensor (13) being installed on the water outlet pipe (12), and a dust cleaning mechanism for the heat pipe heat exchanger (6) being installed on the shell (1).

2. A boiler flue gas constant wall temperature heat exchange device according to claim 1, characterized in that: The water inlet pipe (7) is also provided with a valve (9) and a flow meter (11), and the variable frequency pump (8), the valve (9), the third temperature sensor (10) and the flow meter (11) are sequentially distributed along the medium flow direction of the water inlet pipe (7).

3. A boiler flue gas constant wall temperature heat exchange device according to claim 1, characterized in that: A first temperature sensor (4) is provided through the outer wall of the air inlet of the smoke inlet pipe (2), and a second temperature sensor (5) is provided through the outer wall of the air outlet of the smoke outlet pipe (3).

4. A boiler flue gas constant wall temperature heat exchange device according to claim 1, characterized in that: The dust cleaning mechanism comprises a compressed gas storage tank (15) fixedly mounted on the outer wall of a shell (1) via a bracket (14); an electromagnetic pulse valve (16) is fixedly mounted on the gas outlet of the compressed gas storage tank (15); at least one purge pipe (17) is fixedly mounted above the heat pipe exchanger (6) in the shell (1), and an air inlet end of the purge pipe (17) is fixedly connected to an air outlet end of the electromagnetic pulse valve (16); and a plurality of duckbill nozzles (18) are fixedly mounted on the purge pipe (17) toward the outer wall of the heat pipe exchanger (6).

Images