High-temperature heat accumulating combustion furnace waste heat recycling system

Abstract

The utility model relates to heat recovery and utilization technical field discloses high temperature heat accumulation combustion furnace waste heat recovery and utilization system, including heat exchanger, heat exchange fan, exhaust pipe, valve, cold supplement valve, high efficiency filter, temperature transmitter and control system, the lateral outer wall fixed connection of heat exchanger has hot end import, the lateral outer wall fixed connection of heat exchanger has hot end export, the lateral outer wall fixed connection of heat exchanger has cold end import, the lateral outer wall fixed connection of heat exchanger has cold end export, heat exchange fan fixed connection is away from one end of cold end export of heat exchanger, exhaust pipe fixed connection is away from one end of hot end export of heat exchanger. In the utility model, through control system can make full use of high temperature heat accumulation combustion furnace generated high temperature purification exhaust gas as heat source, and through heat exchanger realizes heat exchange with environmental gas, effectively recovers waste heat and uses the gas after temperature rise for production, improves energy utilization rate.

Description

Technical Field

[0001] This utility model relates to the field of heat recovery and utilization technology, and in particular to a waste heat recovery and utilization system for a high-temperature regenerative combustion furnace. Background Technology

[0002] The high-temperature regenerative combustion furnace waste heat recovery and utilization system is an energy reuse device for high-temperature flue gas (usually 800-1200℃) in industrial furnaces and kilns. Its core is to use honeycomb ceramic heat storage body to alternately absorb the waste heat of flue gas and preheat the combustion air (or fuel gas), so that the temperature of the combustion air is raised to 80%-90% of the flue gas temperature, which greatly reduces fuel consumption (energy saving rate can reach 30%-50%).

[0003] According to the search, Chinese Patent Publication No. CN113339541A discloses a waste heat recovery and utilization system for a high-temperature regenerative combustion furnace. The advantages of the above solution are: the use of a high-quality plate heat exchanger for hot and cold gas heat exchange, resulting in high heat exchange efficiency; the use of aluminum silicate insulation modules for internal insulation of the heat exchanger and high-temperature pipelines, which reduces system heat loss and improves heat recovery effect.

[0004] The above-mentioned device has the following drawbacks: it uses ambient air that has only undergone simple pretreatment as the heat exchange gas source, which makes it difficult to control the cleanliness of the output gas, resulting in unstable temperature and flow rate. Therefore, a high-temperature regenerative combustion furnace waste heat recovery and utilization system is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a high-temperature regenerative combustion furnace waste heat recovery and utilization system, which aims to improve upon the existing technology by drawing on the advantages of existing waste heat recovery and utilization systems and solving the problem that the cleanliness of the output gas of conventional waste heat recovery and utilization systems is not easy to control, resulting in unstable temperature and flow.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a high-temperature regenerative combustion furnace waste heat recovery and utilization system, including a heat exchanger, a heat exchange fan, an exhaust stack, valves, a cooling valve, a high-efficiency filter, a temperature transmitter, and a control system. A hot end inlet, a hot end outlet, and a cold end inlet are fixedly connected to the outer side wall of the heat exchanger. A cold end outlet is also fixedly connected to the outer side wall of the heat exchanger. The heat exchange fan is fixedly connected to the end of the cold end outlet furthest from the heat exchanger. The exhaust stack is fixedly connected to the end of the hot end outlet furthest from the heat exchanger. The valves are fixedly connected to the inner side wall of the hot end inlet. The cooling valve is fixedly connected to the inner side wall of the heat exchanger. The high-efficiency filter is fixedly connected to the inner side wall of the heat exchanger. The temperature transmitter is fixedly connected to the outer side wall of the cold end outlet.

[0007] As a further description of the above technical solution: The control system uses a high-temperature regenerative combustion furnace as a heat source. It utilizes the positive pressure in the furnace to blow part of the high-temperature purified waste gas into the heat exchanger from the hot end inlet, and then discharges it to the exhaust stack from the hot end outlet. At the same time, the ambient gas is filtered and then drawn into the heat exchanger from the cold end inlet under the action of the heat exchange fan, and then discharged from the cold end outlet. The heat exchanger is a plate type, which utilizes the thermal conductivity of metal to exchange heat between hot and cold gases. The heated clean gas is output by the heat exchange fan and can be used for production.

[0008] As a further description of the above technical solution: the high-efficiency filters are respectively installed on the inner side walls of the heat exchanger and the cold end inlet to ensure the cleanliness of the output gas.

[0009] As a further description of the above technical solution: the heat exchange fan adopts a variable frequency motor, and the flow meter on the cold end outlet pipe is interlocked to control the fan operating frequency to achieve stable output gas flow.

[0010] As a further description of the above technical solution: a temperature transmitter is installed on the cold end outlet pipe to monitor the gas temperature after heating, and the temperature transmitter is interlocked with two pneumatic regulating valves and a cooling valve on the hot end inlet pipe and the cold end outlet pipe.

[0011] As a further description of the above technical solution: a control valve is fixedly installed on the inner wall of the heat exchanger. The opening degree of the control valve is adjusted to regulate the amount of heat source gas and cold gas entering, thereby achieving the stability of the output gas temperature.

[0012] This utility model has the following beneficial effects:

[0013] 1. In this utility model, the control system can make full use of the high-temperature purified waste gas generated by the high-temperature regenerative combustion furnace as a heat source, and achieve heat exchange with the ambient gas through the heat exchanger, effectively recovering waste heat and using the heated gas for production, thereby improving energy utilization. At the same time, the high-efficiency filter installed between the heat exchanger and the cold end inlet can ensure the cleanliness of the output gas and meet the production requirements for gas quality.

[0014] 2. In this invention, the heat exchange fan in the system uses a variable frequency motor. The fan's operating frequency is controlled by an interlocking flow meter on the cold end outlet pipe, ensuring a stable output gas flow rate. Furthermore, a temperature transmitter monitors the gas temperature after heating and interlocks with relevant pneumatic regulating valves. The PLC controls the valve opening to adjust the intake of heat source gas and cold air, thereby stabilizing the output gas temperature and ensuring the reliability of system operation and the continuity of production. Attached Figure Description

[0015] Figure 1This is a schematic diagram of the layout of the waste heat recovery and utilization system of the high-temperature regenerative combustion furnace proposed in this utility model;

[0016] Figure 2 This is a schematic diagram of the process flow of the waste heat recovery and utilization system of the high-temperature regenerative combustion furnace proposed in this utility model.

[0017] Legend:

[0018] 101. Heat exchanger; 102. Heat exchange fan; 103. Exhaust stack; 104. Valve; 105. Cooling valve; 106. High-efficiency filter; 107. Flow meter; 108. Temperature transmitter; 1. Hot end inlet; 2. Hot end outlet; 3. Cold end inlet; 4. Cold end outlet. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Reference Figures 1-2 This utility model provides an embodiment of a high-temperature regenerative combustion furnace waste heat recovery and utilization system, including a heat exchanger 101, a heat exchange fan 102, an exhaust stack 103, a valve 104, a cooling valve 105, a high-efficiency filter 106, a temperature transmitter 108, and a control system. A hot end inlet 1 is fixedly connected to the outer side wall of the heat exchanger 101, a hot end outlet 2 is fixedly connected to the outer side wall of the heat exchanger 101, and a cold end inlet 3 is fixedly connected to the outer side wall of the heat exchanger 101. A cold end outlet 4 is fixedly connected to the outer side wall. A heat exchange fan 102 is fixedly connected to the end of the cold end outlet 4 away from the heat exchanger 101. An exhaust stack 103 is fixedly connected to the end of the hot end outlet 2 away from the heat exchanger 101. A valve 104 is fixedly connected to the inner side wall of the hot end inlet 1. A cooling valve 105 is fixedly connected to the inner side wall of the heat exchanger 101. A high-efficiency filter 106 is fixedly connected to the inner side wall of the heat exchanger 101. A temperature transmitter 108 is fixedly connected to the outer side wall of the cold end outlet 4.

[0021] Reference Figures 1-2High-efficiency filters 106 are installed on the inner side walls of heat exchanger 101 and cold end inlet 3 to ensure the cleanliness of the output gas. Heat exchange fan 102 uses a variable frequency motor. Flow meter 107 on cold end outlet 4 interlocks to control the fan operating frequency to achieve stable output gas flow. Temperature transmitter 108 is installed on cold end outlet 4 to monitor the gas temperature after heating. Temperature transmitter 108 is interconnected with two pneumatic regulating valves 104 and cooling valve 105 on hot end inlet 1 and cold end outlet 4.

[0022] Reference Figures 1-2 The control system uses a high-temperature regenerative combustion furnace as a heat source. The positive pressure in the furnace blows part of the high-temperature purified exhaust gas into the heat exchanger 101 through the hot end inlet 1, and then discharges it to the exhaust stack 103 through the hot end outlet 2. At the same time, the ambient gas is filtered and then drawn into the heat exchanger 101 through the cold end inlet 3 under the action of the heat exchange fan 102, and then discharged through the cold end outlet 4. The heat exchanger 101 is a plate type, which uses the thermal conductivity of metal to exchange heat between hot and cold gases. The heated clean gas is output by the heat exchange fan 102 and can be used for production. A PLC is fixedly installed on the inner wall of the side of the heat exchanger 101. The opening of the valve 104 is controlled by the PLC to adjust the amount of heat source gas and cold gas entering, thereby achieving the stability of the output gas temperature.

[0023] Working principle: The control system uses a high-temperature regenerative combustion furnace as a heat source. Utilizing the positive pressure in the furnace, a portion of the high-temperature purified waste gas is blown into heat exchanger 101 through the hot-end inlet 1, and then discharged to exhaust stack 103 through the hot-end outlet 2. Simultaneously, ambient gas, after filtration, is drawn into heat exchanger 101 through cold-end inlet 3 under the action of heat exchange fan 102, and then discharged through cold-end outlet 4. Heat exchanger 101 is a plate type, utilizing the thermal conductivity of metal to exchange heat between hot and cold gases. The heated clean gas, after being output by heat exchange fan 102, can be used for production. The waste heat recovery system is equipped with instruments, pipes, and valves 104. A temperature transmitter 108 is installed on the cold end outlet 4 pipe to monitor the gas temperature after heating. It is also connected to two pneumatic regulating valves on the hot end inlet 1 pipe and the cold end outlet 4 pipe. The opening of valve 104 is controlled by PLC to adjust the amount of heat source gas and cold gas entering, thereby achieving the stability of the output gas temperature. A high-efficiency filter 106 is installed at the cold end inlet 3 of heat exchanger 101 to ensure the cleanliness of the output gas. The heat exchange fan 102 adopts a variable frequency motor. The fan operating frequency is interlocked and controlled by the flow meter 107 on the cold end outlet 4 pipe to achieve the stability of the output gas flow rate.

[0024] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-temperature regenerative combustion furnace waste heat recovery and utilization system, comprising a heat exchanger (101), a heat exchange fan (102), an exhaust stack (103), a valve (104), a cooling valve (105), a high-efficiency filter (106), a temperature transmitter (108), and a control system, characterized in that: The heat exchanger (101) has a hot end inlet (1), a hot end outlet (2), a cold end inlet (3), and a cold end outlet (4) fixedly connected to its outer side wall. The heat exchanger (101) has a hot end outlet (2), a cold end inlet (3), and a cold end outlet (4). The heat exchange fan (102) is fixedly connected to the end of the cold end outlet (4) away from the heat exchanger (101). The exhaust stack (103) is fixedly connected to the end of the hot end outlet (2) away from the heat exchanger (101). The valve (104) is fixedly connected to the inner side wall of the hot end inlet (1). The cooling valve (105) is fixedly connected to the inner side wall of the heat exchanger (101). The high-efficiency filter (106) is fixedly connected to the inner side wall of the heat exchanger (101). The temperature transmitter (108) is fixedly connected to the outer side wall of the cold end outlet (4).

2. The high-temperature regenerative combustion furnace waste heat recovery and utilization system according to claim 1, characterized in that: The control system uses a high-temperature regenerative combustion furnace as a heat source. The positive pressure of the furnace chamber blows part of the high-temperature purified exhaust gas into the heat exchanger (101) through the hot end inlet (1) and then discharges it to the exhaust stack (103) through the hot end outlet (2). At the same time, the ambient gas is filtered and then drawn into the heat exchanger (101) through the cold end inlet (3) under the action of the heat exchange fan (102), and then discharged through the cold end outlet (4). The heat exchanger (101) is plate type and uses the thermal conductivity of metal to exchange heat between hot and cold gases. The heated clean gas can be used for production after being output by the heat exchange fan (102).

3. The high-temperature regenerative combustion furnace waste heat recovery and utilization system according to claim 1, characterized in that: The high-efficiency filters (106) are respectively installed on the inner side walls of the heat exchanger (101) and the cold end inlet (3) to ensure the cleanliness of the output gas.

4. The waste heat recovery and utilization system of the high-temperature regenerative combustion furnace according to claim 1, characterized in that: The heat exchange fan (102) adopts a variable frequency motor, and the flow meter (107) on the cold end outlet (4) pipe is interlocked to control the fan operating frequency in order to achieve stable output gas flow.

5. The high-temperature regenerative combustion furnace waste heat recovery and utilization system according to claim 1, characterized in that: A temperature transmitter (108) is installed on the cold end outlet (4) pipe to monitor the gas temperature after heating. The temperature transmitter (108) is interlocked with two pneumatic regulating valves (104) and a cooling valve (105) on the hot end inlet (1) pipe and the cold end outlet (4) pipe.

6. The high-temperature regenerative combustion furnace waste heat recovery and utilization system according to claim 1, characterized in that: A PLC-controlled valve (104) is fixedly installed on the inner side wall of the heat exchanger (101). The opening degree of the PLC-controlled valve (104) is adjusted to regulate the amount of heat source gas and cold gas entering, thereby achieving the stability of the output gas temperature.

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