Heat exchanger high-temperature compensation system and method of waste gas treatment equipment

Abstract

The invention discloses a heat exchanger high-temperature compensation system of waste gas treatment equipment, which comprises a gas transmission main pipe, an exhaust pipe, a heat exchanger, a heating chamber and a catalyst chamber, the gas transmission main pipe is provided with a gas transmission main valve, the gas transmission main pipe is connected with the heating chamber, the heating chamber is connected with the catalyst chamber, the catalyst chamber is connected with the exhaust pipe, and the heat exchanger is arranged between the gas transmission main pipe and the exhaust pipe. The gas transmission branch pipe is connected with the gas transmission main pipe catalytic chamber, a proportional valve is arranged on the gas transmission branch pipe, a temperature sensor is arranged on the heat exchanger, and the proportional valve, the temperature sensor and the controller are in signal connection; normal-temperature organic waste gas is input into the catalytic chamber through the gas conveying branch pipe, so that the temperature of catalytic reaction is maintained in a normal interval, and the heat exchanger is prevented from continuously working at the over-limit temperature to cause damage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial waste treatment, in particular to a heat exchanger high-temperature compensation system and method of waste gas treatment equipment. BACKGROUND

[0002] OPC is the abbreviation of organic photo conductor, and the OPC drum is a kind of photoelectric converter formed by coating OPC material on the surface of a conductive aluminum cylinder. A large amount of organic waste gas is generated in the OPC manufacturing process, and the generated organic waste gas will seriously pollute the atmospheric environment if discharged into the atmosphere.

[0003] In the process of treating organic waste gas, the organic waste gas is heated to a certain suitable temperature (about 300 DEG C) through a catalytic combustion treatment process, and the organic molecules are cracked and decomposed into water and carbon dioxide through a catalyst. This process releases heat.

[0004] In the prior art, the heat of the exhaust gas (about 380 DEG C) is used to preliminarily heat the organic waste gas (about 180 DEG C) through an exchanger. However, due to different products and different processes, the concentration of the organic waste gas is different. When the concentration of the organic waste gas is high, the heat energy released after the catalytic reaction is large, and the temperature of the tail gas after the catalytic combustion reaction exceeds 450 DEG C. The design temperature of the heat exchanger is 400 DEG C. The continuous operation of the heat exchanger at an over-limit temperature will cause the performance of the heat exchanger to decrease, the material to be damaged, and even a safety accident to occur. SUMMARY

[0005] The purpose of the present application is to provide a heat exchanger high-temperature compensation system of waste gas treatment equipment, which comprises a gas supply main pipe, an exhaust pipe, a heat exchanger, a heating chamber and a catalytic chamber. The gas inlet end of the gas supply main pipe is provided with a gas supply total valve. The gas outlet end of the gas supply main pipe is connected to the heating chamber. The heating chamber is connected to the catalytic chamber. The catalytic chamber is provided with a catalyst. The catalytic chamber is connected to the exhaust pipe. The heat exchanger for exchanging heat is arranged between the gas supply main pipe and the exhaust pipe. The heat exchanger high-temperature compensation system further comprises a gas supply branch pipe, a proportional valve, a temperature sensor and a controller. The gas inlet end of the gas supply branch pipe is connected to the gas supply main pipe. The gas inlet end of the gas supply branch pipe is located between the gas supply total valve and the heat exchanger. The gas outlet end of the gas supply branch pipe is connected to the catalytic chamber. The proportional valve is arranged on the gas supply branch pipe. The temperature sensor is arranged on the heat exchanger. The proportional valve, the temperature sensor and the controller are signal connected.

[0006] Preferably, a fan and a VOC monitor are arranged on the exhaust pipe.

[0007] Preferably, the catalyst is at least one of a transition metal oxide and a noble metal oxide.

[0008] A heat exchanger high temperature compensation method of a waste gas treatment device, opening a gas conveying main valve, high concentration organic waste gas flows to a catalytic chamber through a gas conveying main pipe, the organic waste gas in the gas conveying main pipe is preheated by a heat exchanger (preheating temperature is about 180 DEG C), enters a heating chamber to be heated to a catalytic temperature (catalytic temperature is about 300 DEG C), then the high concentration organic waste gas enters the catalytic chamber to carry out catalytic reaction with a catalyst, obtains high temperature tail gas (temperature is more than 450 DEG C) after reaction, a fan is started, the high temperature tail gas flows out through an exhaust pipe, is cooled by the heat exchanger and is discharged outwards; since the high temperature tail gas (temperature is more than 450 DEG C) after reaction is far higher than the design temperature 400 DEG C of the heat exchanger, a temperature sensor on the heat exchanger alarms, a controller makes a proportional valve on a gas conveying branch pipe open, part of the organic waste gas in the gas conveying main pipe does not pass through the heat exchanger for preheating, directly enters the catalytic chamber through the gas conveying branch pipe (normal temperature of the organic waste gas is about 20 DEG C), the temperature of the discharged high temperature tail gas is reduced to about 380 DEG C, thereby avoiding the heat exchanger continuously working at an over-limit temperature and causing damage.

[0009] Preferably, the VOC monitor analyzes the organic components of the tail gas after heat exchange, when the organic components reach the emission standard, the tail gas is discharged outwards through the exhaust pipe.

[0010] The application has the advantages and benefits that: a heat exchanger high temperature compensation system and method of a waste gas treatment device, by setting a gas conveying branch pipe directly connected with the catalytic chamber on the gas conveying main pipe, when the catalytic chamber causes the temperature of the catalytic reaction to be higher than the design temperature of the heat exchanger due to too high concentration of the organic waste gas, the normal temperature organic waste gas is input into the catalytic chamber through the gas conveying branch pipe, thereby making the temperature of the catalytic reaction maintain in a normal range (about 380 DEG C), avoiding the heat exchanger continuously working at an over-limit temperature and causing damage. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a schematic diagram of the application. DETAILED DESCRIPTION

[0012] The specific embodiment of the application is further described below in combination with the drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the application, and cannot be used to limit the protection scope of the application.

[0013] The technical solutions of the embodiment of the application are: For example, Figure 1As shown, a heat exchanger high temperature compensation system of a waste gas treatment device includes a gas supply main pipe 1, an exhaust pipe 2, a heat exchanger 3, a heating chamber 4 and a catalytic chamber 5, the gas supply main pipe 1 is provided with a gas supply main valve 6 at the gas inlet end, the gas outlet end of the gas supply main pipe 1 is connected to the heating chamber 4, the heating chamber 4 is connected to the catalytic chamber 5, the catalytic chamber 5 is provided with a catalyst 51, the catalytic chamber 5 is connected to the exhaust pipe 2, the heat exchanger 3 for exchanging heat is arranged between the gas supply main pipe 1 and the exhaust pipe 2, the heat exchanger 3 high temperature compensation system further includes a gas supply branch pipe 7, a proportional valve 71, a temperature sensor 31 and a controller (not shown in the figure), the gas inlet end of the gas supply branch pipe 7 is connected to the gas supply main pipe 1, the gas inlet end of the gas supply branch pipe 7 is located between the gas supply main valve 6 and the heat exchanger 3, the gas outlet end of the gas supply branch pipe 7 is connected to the catalytic chamber 5, the proportional valve 71 is arranged on the gas supply branch pipe 7, the temperature sensor 31 is arranged on the heat exchanger 3, and the proportional valve 71, the temperature sensor 31 and the controller are signal connected.

[0014] The above-mentioned exhaust pipe 2 is provided with a fan 8 and a VOC monitor 9.

[0015] The above-mentioned catalyst 51 is at least one of transition metal oxides and noble metal oxides.

[0016] A heat exchanger high temperature compensation method of a waste gas treatment device, the gas supply main valve 6 is opened, high concentration of organic waste gas flows to the catalytic chamber 5 through the gas supply main pipe 1, the organic waste gas in the gas supply main pipe 1 is preheated by the heat exchanger 3 (preheating temperature is about 180℃), enters the heating chamber 4 and is heated to the catalytic temperature (catalytic temperature is about 300℃), then the high concentration of organic waste gas enters the catalytic chamber 5 and catalytically reacts with the catalyst 51, to obtain high temperature tail gas after reaction (temperature is more than 450℃), the fan 8 is started, the high temperature tail gas flows out through the exhaust pipe 2, and is cooled by the heat exchanger 3 after heat exchange, and then is discharged outward; since the high temperature tail gas after reaction (temperature is more than 450℃) is far higher than the design temperature 400℃ of the heat exchanger 3, the temperature sensor 31 on the heat exchanger 3 alarms, the controller makes the proportional valve 71 on the gas supply branch pipe 7 open, and part of the organic waste gas in the gas supply main pipe 1 does not pass through the heat exchanger 3 for preheating, but directly enters the catalytic chamber 5 through the gas supply branch pipe 7 (normal temperature of the organic waste gas is about 20℃), so that the temperature of the discharged high temperature tail gas is reduced to about 380℃, thereby avoiding the heat exchanger 3 from continuously working at an over-limit temperature and causing damage.

[0017] The above-mentioned VOC monitor 9 analyzes the organic components of the tail gas after heat exchange, when the organic components reach the emission standard, the tail gas is discharged outward through the exhaust pipe 2.

[0018] The application has the advantages and beneficial effects that the heat exchanger high-temperature compensation system and method of the waste gas treatment equipment, by setting the gas conveying branch pipe 7 directly connected with the catalytic chamber 5 on the gas conveying main pipe 1, when the catalytic reaction temperature exceeds the design temperature of the heat exchanger 3 due to the too high concentration of the organic waste gas, the normal temperature organic waste gas is input into the catalytic chamber 5 through the gas conveying branch pipe 7, so that the catalytic reaction temperature is maintained within the normal range (about 380℃), avoiding the continuous operation of the heat exchanger 3 at the over-limit temperature and causing damage.

[0019] In use, the gas conveying main valve 6 is opened, the organic waste gas flows to the catalytic chamber 5 through the gas conveying main pipe 1, the organic waste gas in the gas conveying main pipe 1 is preheated by the heat exchanger 3 (the preheating temperature is about 180℃), and then enters the catalytic chamber 5, is heated to the catalytic temperature (the catalytic temperature is about 300℃) by the heater 4, and is catalytically reacted with the catalyst 51 to obtain the high-temperature tail gas (about 380℃) after reaction, the fan 8 is started, the high-temperature tail gas flows out through the exhaust pipe 2, is cooled by the heat exchanger 3 (the design temperature of the heat exchanger 3 is 400℃), and is discharged outwards by the exhaust pipe 2; Since the concentration of the organic waste gas is different due to different products and processes, when the high-concentration organic waste gas is catalytically reacted, the released heat energy is large, the temperature of the obtained high-temperature tail gas exceeds 450℃, which is far higher than the design temperature 400℃ of the heat exchanger 3, the temperature sensor 31 on the heat exchanger 3 alarms, the controller opens the proportional valve 71 on the gas conveying branch pipe 7, part of the organic waste gas in the gas conveying main pipe 1 is directly input into the catalytic chamber 5 without preheating by the heat exchanger 3 (the normal temperature of the organic waste gas is about 20℃), the temperature of the discharged high-temperature tail gas is reduced to about 380℃, avoiding the continuous operation of the heat exchanger 3 at the over-limit temperature, reducing the material damage and the occurrence of safety accidents.

[0020] The above only describes the preferred embodiments of the application, and it should be noted that the ordinary skilled in the art can make some improvements and decorations without departing from the technical principles of the application, and these improvements and decorations should also be considered as the protection scope of the application.

Claims

1. A heat exchanger high-temperature compensation system for exhaust gas treatment equipment, comprising a gas main, an exhaust pipe, a heat exchanger, a heating chamber, and a catalyst chamber, wherein the gas inlet end of the gas main is provided with a gas main valve, the gas outlet end of the gas main is connected to the heating chamber, the heating chamber is connected to the catalyst chamber, a catalyst is provided in the catalyst chamber, the catalyst chamber is connected to the exhaust pipe, and a heat exchanger for exchanging heat is provided between the gas main and the exhaust pipe, characterized in that: The heat exchanger high temperature compensation system also includes a gas branch pipe, a proportional valve, a temperature sensor and a controller. The gas inlet end of the gas branch pipe is connected to the gas main pipe, the gas inlet end of the gas branch pipe is located between the gas main valve and the heat exchanger, and the gas outlet end of the gas branch pipe is connected to the catalyst chamber. The proportional valve is arranged on the gas branch pipe, and the temperature sensor is arranged on the heat exchanger. Signals are connected between the proportional valve, temperature sensor and controller.

2. The high temperature compensation system for a heat exchanger of an exhaust gas treatment device according to claim 1, characterized in that: The exhaust pipe is provided with a fan and a VOC monitor.

3. The high temperature compensation system for a heat exchanger of an exhaust gas treatment device according to claim 2, characterized in that: The catalyst is at least one of a transition metal oxide and a noble metal oxide.

4. A high temperature compensation method for a heat exchanger of an exhaust gas treatment device, characterized in that: The high temperature compensation system for the heat exchanger of the exhaust gas treatment equipment according to claim 3 comprises the following steps: The main gas valve is opened, and high-concentration organic waste gas flows toward the catalyst chamber through the gas main. The organic waste gas in the gas main is preheated by the heat exchanger (preheating temperature is about 180℃), and then enters the heating chamber to be heated to the catalytic temperature (catalytic temperature is about 300℃). Then, the high-concentration organic waste gas enters the catalytic chamber for a catalytic reaction with the catalyst, obtaining high-temperature exhaust gas after the reaction (temperature exceeding 450℃). The fan is started, and the high-temperature exhaust gas flows outward through the exhaust pipe, is cooled by heat exchange in the heat exchanger, and is then discharged outward. Since the high-temperature exhaust gas after the reaction (temperature exceeding 450℃) far exceeds the design temperature of the heat exchanger of 400℃, the temperature sensor on the heat exchanger alarms, and the controller opens the proportional valve on the gas branch pipe, so that part of the organic waste gas in the gas main is not preheated by the heat exchanger and is directly input into the catalytic chamber through the gas branch pipe (the normal temperature of organic waste gas is about 20℃), so that the temperature of the discharged high-temperature exhaust gas is reduced to about 380℃, thereby preventing the heat exchanger from continuously operating at an excessive temperature.

5. The high temperature compensation method for a heat exchanger of an exhaust gas treatment device according to claim 4, characterized in that: The VOC monitor analyzes the organic components of the tail gas after heat exchange. When the organic components meet the emission standards, the tail gas is discharged to the outside through the exhaust pipe.

Images