A heat exchange system for waste gas incineration treatment of a TO furnace

Abstract

The present application relates to waste gas treatment technical field, specifically to a kind of TO furnace waste gas incineration treatment heat exchange system, the system includes heat exchanger, TO furnace and the waste gas conveying pipe of connecting first induced draft fan, the waste gas conveying pipe outlet end is connected with the TO furnace, the waste gas conveying pipe is also connected with the heat exchanger, waste gas in the waste gas conveying pipe is sprayed into the combustion chamber of TO furnace after preheating by heat exchanger and burns;It also includes natural gas conveying pipe and combustion air conveying pipe, the combustion air pipe is connected with second induced draft fan;It also includes evaporative cooler and exhaust pipe, and it also includes compressed air pipe and industrial water pipe, the evaporative cooler outlet end is connected with chimney, third induced draft fan is connected between the evaporative cooler and the chimney.The present application makes waste gas temperature rise before reaching the combustion chamber of TO furnace, saves fuel;Carbon dioxide and water vapor produced after waste gas combustion are cooled using evaporative cooler, so that the temperature after chimney discharge is less than 150 DEG C, to reach the discharge requirement.

Description

Technical Field

[0001] This invention relates to the field of waste gas treatment technology, specifically a heat exchange system for incinerating waste gas from a TO furnace. Background Technology

[0002] Due to the rapid development of existing industries and agriculture, and the increasingly stringent requirements for environmental protection, existing waste gas incineration treatments often suffer from incomplete combustion, fuel waste, untimely cooling of carbon dioxide produced after combustion, and excessive gas emission temperatures, failing to meet environmental protection requirements. In particular, the pollution from the incineration of chemical products has seriously damaged the atmosphere and affected our living environment. Summary of the Invention

[0003] To address the technical problems commonly encountered in existing waste gas incineration technologies, such as incomplete combustion, fuel waste, untimely cooling of carbon dioxide produced after combustion, and excessive gas emission temperatures, this invention provides a TO furnace waste gas incineration heat exchange system to solve the aforementioned technical problems.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A heat exchange system for treating exhaust gas from a TO furnace is disclosed. The system includes a heat exchanger, a TO furnace, and an exhaust gas delivery pipe connected to a first induced draft fan. The first induced draft fan introduces the exhaust gas into the exhaust gas delivery pipe. The outlet end of the exhaust gas delivery pipe is connected to the TO furnace. The exhaust gas delivery pipe is equipped with an exhaust gas valve and is also connected to the heat exchanger. The exhaust gas in the exhaust gas delivery pipe is preheated by the heat exchanger and then injected into the combustion chamber of the TO furnace for combustion.

[0006] It also includes a natural gas supply pipe and a combustion air supply pipe, which are connected to the TO furnace and provide fuel to the TO furnace. The combustion air pipe is connected to a second induced draft fan, which introduces combustion air into the TO furnace. The natural gas supply pipe and the combustion air supply pipe are equipped with gas valves.

[0007] It also includes an evaporative cooler and an exhaust pipe, the exhaust pipe being connected to the heat exchanger. The gas produced after the exhaust gas is burned in the TO furnace passes through the exhaust pipe and is sent to the evaporative cooler after heat exchange in the heat exchanger. It also includes a compressed air pipe and an industrial water pipe, the compressed air pipe providing compressed air and the industrial water pipe providing cooling water, and the two are mixed before entering the evaporative cooler.

[0008] The outlet of the evaporative cooler is connected to a chimney, and a third induced draft fan is connected between the evaporative cooler and the chimney. The third induced draft fan leads the cooled gas to the chimney for discharge.

[0009] Furthermore, the exhaust gas conveying pipe is connected to a first fresh air duct, and the first fresh air duct is equipped with a first fresh air valve, through which external fresh air is supplied to the exhaust gas conveying pipe.

[0010] Furthermore, the exhaust gas conveying pipe is also equipped with an explosion-proof valve and a pipeline diaphragm.

[0011] Furthermore, the TO furnace is also connected to a nitrogen tank via a nitrogen delivery pipe, and the nitrogen delivery pipe is equipped with a nitrogen valve.

[0012] Furthermore, the exhaust gas delivery pipe is equipped with a pressure transmitter, a local pressure gauge, and a first temperature sensor at the front end of the heat exchanger.

[0013] Furthermore, a second temperature sensor is provided at the rear end of the heat exchanger in the exhaust gas delivery pipe.

[0014] Furthermore, the front and rear sections of the TO furnace are each equipped with a third temperature sensor, the exhaust pipe at the rear end of the TO furnace is equipped with a fourth temperature sensor, the exhaust pipe at the front end of the evaporative cooler is equipped with a fifth temperature sensor, and the exhaust pipe at the rear end of the evaporative cooler is equipped with a sixth temperature sensor.

[0015] Furthermore, the exhaust pipe is connected to a second fresh air duct at the end of the heat exchanger. The second fresh air duct is equipped with a second fresh air valve, and external fresh air is supplied to the exhaust pipe through the second fresh air duct.

[0016] Furthermore, a first emergency pipe is connected between the exhaust gas conveying pipe and the evaporator, and the first emergency pipe is equipped with a first emergency vent valve. A second emergency pipe is provided between the TO furnace and the evaporator, and the second emergency pipe is equipped with a second emergency vent valve.

[0017] Furthermore, the heat exchanger is a shell-and-tube heat exchanger, and the heat exchange tubes of the heat exchanger adopt an S-shaped structure.

[0018] By adopting the above technical solution, the beneficial effects of the present invention are:

[0019] The exhaust gas drawn in by the first induced draft fan enters the TO furnace for combustion through the exhaust gas delivery pipe. Because the pipeline is equipped with a heat exchanger, the carbon dioxide and water vapor produced after the exhaust gas combustion exchange heat with the newly passing exhaust gas through the heat exchanger, preheating the exhaust gas and increasing its temperature before reaching the combustion chamber of the TO furnace, thus saving fuel and reducing exhaust gas treatment costs. The carbon dioxide and water vapor produced after the exhaust gas combustion are cooled by an evaporative cooler, so that the temperature after passing through the chimney is less than 150°C, meeting emission requirements and protecting the environment. Attached Figure Description

[0020] Figure 1This is a schematic diagram of the structure of the present invention;

[0021] In the diagram: Heat exchanger 1, TO furnace 2, first induced draft fan 3, exhaust gas delivery pipe 4, exhaust gas valve 5, natural gas delivery pipe 6, combustion air delivery pipe 7, second induced draft fan 8, gas valve 9, evaporative cooler 10, exhaust pipe 11, compressed air pipe 12, industrial water pipe 13, chimney 14, third induced draft fan 15, first fresh air duct 16, first fresh air valve 17, explosion-proof valve 18, pipeline diaphragm 19, nitrogen delivery pipe 20, nitrogen tank 21, nitrogen valve 22, pressure transmitter 23, local pressure gauge 24, first temperature sensor 25, second temperature sensor 26, third temperature sensor 27, second fresh air duct 28, second fresh air valve 29, first emergency pipe 30, first emergency vent valve 31, second emergency pipe 32, second emergency vent valve 33, fourth temperature sensor 34, fifth temperature sensor 35, sixth temperature sensor 36. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example, reference Figure 1 This embodiment discloses a heat exchange system for incinerating exhaust gas from a TO furnace. The system includes a heat exchanger 1, a TO furnace 2, and an exhaust gas delivery pipe 4 connected to a first induced draft fan 3. The first induced draft fan 3 introduces the exhaust gas into the exhaust gas delivery pipe 4. The exhaust gas delivery pipe 4 is connected to the TO furnace 2 at its outlet end. The exhaust gas delivery pipe 4 is equipped with an exhaust gas valve 5, which is an electric valve to regulate the exhaust volume of the exhaust gas. The exhaust gas delivery pipe 4 is also connected to the heat exchanger 1. The exhaust gas in the exhaust gas delivery pipe 4 is preheated by the heat exchanger 1 and then injected into the combustion chamber of the TO furnace 2 for combustion.

[0024] It also includes a natural gas supply pipe 6 and a combustion air supply pipe 7, which are connected to the TO furnace 2 and provide fuel to the TO furnace 2. The combustion air pipe is connected to a second induced draft fan 8, which introduces combustion air into the TO furnace 2. The natural gas supply pipe 6 and the combustion air supply pipe 7 are equipped with gas valves 9, which are electric valves and are controlled to open and close by an external controller according to real-time requirements.

[0025] It also includes an evaporative cooler 10 and an exhaust pipe 11. The exhaust pipe 11 is connected to the heat exchanger 1. The gas generated after the exhaust gas is burned in the TO furnace 2 passes through the exhaust pipe 11 and is sent to the evaporative cooler 10 after heat exchange in the heat exchanger 1. It also includes a compressed air pipe 12 and an industrial water pipe 13. The compressed air pipe 12 provides compressed air and the industrial water pipe 13 provides cooling water. The two are mixed and then enter the evaporative cooler 10.

[0026] The outlet of the evaporative cooler 10 is connected to a chimney 14, and a third induced draft fan 15 is connected between the evaporative cooler 10 and the chimney 14. The third induced draft fan 15 leads the cooled gas to the chimney 14 for discharge.

[0027] After the exhaust gas is burned in TO furnace 2, it produces high-temperature carbon dioxide and water vapor. Since heat exchanger 1 is installed in the pipeline, the carbon dioxide and water vapor produced after the exhaust gas combustion exchange heat with the newly passing exhaust gas through heat exchanger 1, and at the same time preheat the exhaust gas, so that the exhaust gas temperature increases before reaching the combustion chamber of TO furnace 2, saving fuel and thus saving exhaust gas treatment costs. The carbon dioxide and water vapor produced after the exhaust gas combustion are cooled by evaporative cooler 10, so that the temperature after being discharged through chimney 14 is less than 150°C, meeting the emission requirements and protecting the environment.

[0028] In this embodiment, the exhaust gas delivery pipe 4 is connected to a first fresh air duct 16, which is equipped with a first fresh air valve 17. External fresh air is supplied to the exhaust gas delivery pipe 4 through the first fresh air duct 16. With this configuration, since the generated exhaust gas that needs to be treated is approximately 200°C, fresh air is introduced to lower the temperature of the exhaust gas at this moment and ensure the safety of the pipeline, thereby reducing the initial temperature of the exhaust gas delivery pipe 4.

[0029] To ensure the safety of the exhaust gas conveying pipe 4, prevent safety accidents, and ensure the safe operation of the system, the exhaust gas conveying pipe 4 is also equipped with an explosion-proof valve 18 and a pipeline diaphragm 19.

[0030] The TO furnace 2 is also connected to a nitrogen tank 21 via a nitrogen delivery pipe 20, which is equipped with a nitrogen valve 22. When maintenance is required on the TO furnace 2, the nitrogen valve 22 is opened to purge the TO furnace 2 with nitrogen, thus preventing safety accidents and ensuring the safe operation of the system.

[0031] In this embodiment, the exhaust gas conveying pipe 4 is equipped with a pressure transmitter 23, a local pressure gauge 24 and a first temperature sensor 25 at the front end of the heat exchanger 1, which are used to monitor the temperature and pressure of the exhaust gas before it enters the heat exchanger 1 for heat exchange.

[0032] The exhaust gas conveying pipe 4 is equipped with a second temperature sensor 26 at the rear end of the heat exchanger 1. The second temperature sensor 26 is used to monitor the temperature of the exhaust gas after heat exchange in real time. At this time, the monitored temperature is approximately 410°C.

[0033] The TO furnace 2 is equipped with a third temperature sensor 27 at both its front and rear sections. The third temperature sensor 27 monitors the temperature of carbon dioxide and water vapor produced after combustion in the combustion chamber, at approximately 760°C. The exhaust pipe 11, located at the rear of the TO furnace 2, is equipped with a fourth temperature sensor 34. The fourth temperature sensor 34 monitors the temperature of carbon dioxide and water vapor produced from the combustion exhaust before they enter the heat exchanger 1, at approximately 760°C. The exhaust pipe 11, located at the front of the evaporative cooler 10, is equipped with a fifth temperature sensor 35. The fifth temperature sensor 35 monitors the temperature of carbon dioxide and water vapor produced from the combustion exhaust before they enter the evaporative cooler 10, at approximately 550°C. The exhaust pipe 11, located at the rear of the evaporative cooler 10, is equipped with a sixth temperature sensor 36. The sixth temperature sensor 36 detects the temperature at which carbon dioxide and water vapor are to be emitted after cooling, at approximately 150°C. All of the above temperature sensors can be thermocouples.

[0034] The exhaust pipe 11 is located at the end of the heat exchanger 1 and is connected to a second fresh air duct 28. The second fresh air duct 28 is equipped with a second fresh air valve 29, through which fresh air from outside is supplied to the exhaust pipe 11. This arrangement is designed to cool the water vapor and carbon dioxide before they enter the evaporative cooler 10.

[0035] A first emergency pipe 30 connects the exhaust gas delivery pipe 4 to the evaporator cooler 10. The first emergency pipe 30 is equipped with a first emergency vent valve 31. In case of emergency, the first emergency vent valve 31 is opened to directly introduce the exhaust gas from the exhaust gas delivery pipe 4 into the evaporator cooler 10, preventing safety accidents. A second emergency pipe 32 connects the TO furnace 2 to the evaporator cooler 10. The second emergency pipe 32 is equipped with a second emergency vent valve 33. In case of emergency, the second emergency vent valve 33 is opened to directly introduce the gas from the exhaust pipe 11 into the evaporator cooler 10, preventing safety accidents.

[0036] In this embodiment, the heat exchanger 1 is a shell and tube heat exchanger 1, and the heat exchange tubes of the heat exchanger 1 adopt an S-shaped structure to prevent thermal deformation and cracking of the heat exchange tubes.

[0037] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0039] Although the invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, features in the embodiments disclosed herein can be combined in any way, provided there is no structural conflict. The lack of an exhaustive description of these combinations in this specification is merely for brevity and resource conservation. Therefore, the invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A heat exchange system for treating exhaust gas from a TO furnace, characterized in that: The system includes a heat exchanger (1), a TO furnace (2), and a waste gas conveying pipe (4) connected to a first induced draft fan (3). The first induced draft fan (3) introduces the waste gas into the waste gas conveying pipe (4). The outlet end of the waste gas conveying pipe (4) is connected to the TO furnace (2). The waste gas conveying pipe (4) is equipped with a waste gas valve (5). The waste gas conveying pipe (4) is also connected to the heat exchanger (1). The waste gas in the waste gas conveying pipe (4) is preheated by the heat exchanger (1) and then injected into the combustion chamber of the TO furnace (2) for combustion. It also includes a natural gas supply pipe (6) and a combustion air supply pipe (7), the natural gas supply pipe (6) and the combustion air supply pipe (7) are connected to the TO furnace (2) and provide fuel to the TO furnace, the combustion air supply pipe (7) is connected to a second induced draft fan (8), the second induced draft fan (8) introduces combustion air into the TO furnace (2), and the natural gas supply pipe (6) and the combustion air supply pipe (7) are equipped with gas valves (9); It also includes an evaporative cooler (10) and an exhaust pipe (11), the exhaust pipe (11) being connected to the heat exchanger (1). The gas generated after the exhaust gas is burned in the TO furnace (2) passes through the exhaust pipe (11) and is sent to the evaporative cooler (10) after heat exchange in the heat exchanger (1). It also includes a compressed air pipe (12) and an industrial water pipe (13), the compressed air pipe (12) providing compressed air and the industrial water pipe (13) providing cooling water, and the two are mixed before entering the evaporative cooler (10). The outlet end of the evaporative cooler (10) is connected to a chimney (14), and a third induced draft fan (15) is connected between the evaporative cooler (10) and the chimney (14). The third induced draft fan (15) leads the cooled gas to the chimney (14) for discharge. The exhaust gas conveying pipe (4) is connected to a first fresh air pipe (16), and the first fresh air pipe (16) is equipped with a first fresh air valve (17). External fresh air is supplied to the exhaust gas conveying pipe (4) through the first fresh air pipe (16). The exhaust pipe (11) is located at the end of the heat exchanger (1) and is connected to a second fresh air pipe (28). The second fresh air pipe (28) is equipped with a second fresh air valve (29). External fresh air is supplied to the exhaust pipe (11) through the second fresh air pipe (28). A first emergency pipe (30) is connected between the exhaust gas conveying pipe (4) and the evaporator (10). The first emergency pipe (30) is equipped with a first emergency vent valve (31). A second emergency pipe (32) is provided between the TO furnace (2) and the evaporator (10). The second emergency pipe (32) is equipped with a second emergency vent valve (33).

2. The TO furnace waste gas incineration heat exchange system according to claim 1, characterized in that: The exhaust gas conveying pipe (4) is also equipped with an explosion-proof valve (18) and a pipeline diaphragm (19).

3. The heat exchange system for incinerating TO furnace waste gas according to claim 1, characterized in that: The TO furnace is also connected to a nitrogen tank (21) via a nitrogen delivery pipe (20), and the nitrogen delivery pipe (20) is equipped with a nitrogen valve (22).

4. The TO furnace waste gas incineration heat exchange system according to claim 1, characterized in that: The exhaust gas delivery pipe (4) is equipped with a pressure transmitter (23), a local pressure gauge (24) and a first temperature sensor (25) at the front end of the heat exchanger (1).

5. The TO furnace waste gas incineration heat exchange system according to claim 1, characterized in that: The exhaust gas delivery pipe (4) is equipped with a second temperature sensor (26) at the rear end of the heat exchanger (1).

6. The heat exchange system for treating TO furnace waste gas incineration according to claim 1, characterized in that: The front and rear sections of the TO furnace (2) are equipped with a third temperature sensor (27), the exhaust pipe (11) is equipped with a fourth temperature sensor (34) at the rear end of the TO furnace, the exhaust pipe (11) is equipped with a fifth temperature sensor (35) at the front end of the evaporator (10), and the exhaust pipe (11) is equipped with a sixth temperature sensor (36) at the rear end of the evaporator (10).

7. The TO furnace waste gas incineration heat exchange system according to claim 1, characterized in that: The heat exchanger (1) is a shell and tube heat exchanger (1), and the heat exchange tubes of the heat exchanger (1) adopt an S-shaped structure.

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