Hot blast furnace pressure monitoring and control system

Abstract

The utility model relates to the field of hot blast furnaces, and discloses a hot blast furnace pressure monitoring and control system, including: a furnace, a hot blast duct and a heat exchange device connected in sequence, a pressure sensor for monitoring the pressure in the furnace is provided on the furnace, a sealing plate is provided on the outside of the hot blast duct, the sealing plate and the outer wall of the furnace, the outer wall of the hot blast duct and the outer wall of the heat exchange device form a normal temperature air cavity, the normal temperature air cavity is connected with the heat exchange device, and a control switch for controlling the opening and closing of the connecting port is provided at the connection between the normal temperature air cavity and the heat exchange device. This scheme monitors the pressure in the heat exchange device in real time, judges whether the furnace pressure is normal, and timely fills the normal pressure gas, cools down and reduces the pressure at the heat exchange device, so that the raw materials fall normally and avoids the damage of the material conveying mechanism caused by high temperature; the sealing plate can further strengthen the isolation effect of the hot blast duct, reduce the heat loss of the hot blast duct, and prevent the operator from directly touching the hot blast duct, thereby improving the safety of the equipment.

Description

Technical Field

[0001] The utility model relates to the field of hot blast furnaces, in particular to a hot blast furnace chamber pressure monitoring and control system. Background Art

[0002] A hot air furnace is a combustion device used to generate hot air or high-temperature air. It is often used in industrial production for heating, drying, baking and other processes. The hot air furnace generates heat by burning fuel, and then uses the heat exchange equipment inside the hot air furnace to transfer the heat to the air passing through, so that it heats up and becomes hot air. The hot air furnace usually consists of a combustion system, a combustion chamber, a fuel supply system, a heat exchange equipment, a fan, etc. The combustion system is responsible for burning fuel to generate heat, the combustion chamber is where the combustion process occurs, the fuel supply system transports the fuel to the combustion chamber, the heat exchange equipment transfers the generated heat to the air, and the fan is used to blow the air to where it is needed.

[0003] Traditional hot blast furnaces use coal as fuel. According to different process requirements, hot blast furnaces can generate hot air of different temperatures and flow rates. Biomass pellets are a renewable energy source, such as wood chip pellets, straw pellets, etc., which can be used as environmentally friendly fuel for combustion in hot blast furnaces. However, the heat released by biomass combustion is relatively low, and a higher combustion temperature is required to achieve the same heating effect. Therefore, in order to ensure that the biomass pellets are fully burned and provide sufficient heat, the hot air temperature requirement of the hot blast furnace will be higher than the original hot blast furnace requirement. The current furnace will generate positive pressure due to high temperature, and the high-temperature gas will be discharged from the feed port, affecting the feed speed and causing damage to the feeding mechanism. Utility Model Content

[0004] The utility model is intended to provide a hot blast furnace pressure monitoring and control system to solve the problem that when biomass particles are used to replace traditional fuel in a hot blast furnace, the furnace will generate positive pressure due to the higher combustion temperature, affecting the feed speed and causing damage to the feeding mechanism.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a hot air furnace pressure monitoring and control system, comprising: a furnace, a hot air duct and a heat exchange device connected in sequence, the heat exchange device is provided with a pressure sensor for monitoring the internal pressure of the heat exchange device, a sealing plate is provided on the outside of the hot air duct, the sealing plate and the outer wall of the furnace, the outer wall of the hot air duct and the outer wall of the heat exchange device form a normal temperature air cavity, the normal temperature air cavity is connected with the heat exchange device, and a control switch for controlling the opening and closing of this connecting port is provided at the connection between the normal temperature air cavity and the heat exchange device.

[0006] The principle of this solution is: the pressure sensor detects the pressure inside the heat exchange equipment in real time, so as to determine whether the pressure inside the furnace is normal. When the pressure reaches the set range value, the control switch is controlled to connect the normal temperature air cavity with the heat exchange equipment, and fill the normal temperature air into the normal temperature air cavity, so that the normal temperature air enters the heat exchange equipment, mixes with the original hot air to form a mixed cyclone to reduce the temperature and pressure, so that the raw materials fall into the furnace normally, and also avoids the high temperature gas being discharged from the furnace feed port and burning and damaging the material conveying mechanism.

[0007] Advantages of this solution: By real-time monitoring of the pressure in the heat exchange equipment, it is possible to determine whether the pressure in the furnace is normal, and timely fill in normal pressure gas to cool and reduce the pressure at the heat exchange equipment, so that the raw materials can fall into the furnace normally and avoid damage to the material conveying mechanism due to high temperature; at the same time, the sealing plate can be used to further strengthen the isolation effect of the hot air duct, reduce the heat loss of the hot air duct, and prevent operators from directly touching the hot air duct, thereby improving equipment safety.

[0008] Preferably, the control switch includes a baffle and a switch plate for closing the connection between the normal temperature air cavity and the heat exchange device, the switch plate is hinged on the inner wall of the normal temperature air cavity, and the baffle is used to prevent the switch plate from moving away from the heat exchange device. When the hot air furnace needs to be depressurized, gas is filled into the normal temperature air cavity, the switch plate is opened under the action of the gas, and the gas enters the heat exchange device for cooling.

[0009] Preferably, the sealing plate is in the shape of a ring.

[0010] Preferably, the normal temperature air cavity is spiral-shaped, and gas is filled into the normal temperature air cavity. The air flow spirals into the heat exchange device to quickly mix with the hot air flow to reduce the temperature and pressure.

[0011] Preferably, a heat insulating layer is provided on the outside of the hot air duct to reduce the heat loss of the gas in the hot air duct.

[0012] Preferably, the installation position of the pressure sensor on the heat exchange device is arranged opposite to the connection point between the hot air duct and the heat exchange device.

[0013] Preferably, a feed port is provided at the top of the furnace, and a conical discharge port is provided at the bottom of the furnace. This up-and-down arrangement is conducive to the flow of fuel in the furnace and the discharge of combustion waste.

[0014] Preferably, the heat exchange device and the communication port of the normal temperature air cavity are arranged at an angle.

[0015] Preferably, the pressure sensor is a flexible sensor. Flexible sensors have good durability and wear resistance, and can extend their service life to a certain extent.

[0016] Preferably, the diameter of the hot air duct gradually increases from the furnace to the heat exchange device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of an embodiment of the utility model.

[0018] Figure 2 It is a cross-sectional schematic diagram of an embodiment of the utility model. DETAILED DESCRIPTION

[0019] The following is further described in detail through specific implementation methods:

[0020] The reference numerals in the drawings of the specification include: furnace 1, hot air duct 2, heat exchange equipment 3, normal temperature air cavity 4, sealing plate 5, pressure sensor 6.

[0021] Example:

[0022] A hot blast furnace pressure monitoring and control system, as shown in the attached Figure 1 and attached Figure 2 As shown, it includes: a furnace 1, a hot air duct 2 and a heat exchange device 3 connected in sequence, and the communication port between the heat exchange device 3 and the normal temperature air cavity 4 is arranged obliquely toward the hot air duct 2. The diameter of the hot air duct 2 gradually increases from the furnace 1 to the heat exchange device 3.

[0023] A feed port is provided at the top of the furnace 1, and a conical discharge port is provided at the bottom of the furnace 1. This upper and lower arrangement is conducive to the flow of fuel in the furnace 1 and the discharge of combustion waste. The connecting port between the hot air duct 2 and the furnace 1 is located in the middle of the furnace 1. The hot air duct 2 is used to transfer the high-temperature flue gas in the furnace 1 to the heat exchange device 3. The heat exchange device 3 can be a boiler or a device with a heat exchange pipe. After the high-temperature flue gas is cooled by heat exchange, it is discharged from the bottom of the heat exchange device 3.

[0024] The heat exchange device 3 is provided with a pressure sensor 6 for the internal pressure of the heat exchange device 3. The data of the pressure sensor 6 can be used to determine whether the pressure in the furnace 1 is normal. Under normal circumstances, the pressure in the furnace 1 is higher than that in the heat exchange device 2. When the internal pressure of the heat exchange device 3 is relatively large, the pressure in the furnace 1 will also be relatively large. By setting the pressure sensor 6 on the heat exchange device 3, the pressure of the furnace can be known, and at the same time, the installation environment temperature of the pressure sensor 6 is not too high, which may affect the service life of the pressure sensor 6.

[0025] In this embodiment, when the pressure reaches the set range value, the high-temperature flue gas transported from the hot air duct 2 to the heat exchange device 3 is cooled and depressurized. In this embodiment, when the pressure value obtained is normal and does not reach 100KP, no control is required; when the pressure value obtained is 100KP~200KP, the high-temperature flue gas transported from the hot air duct 2 to the heat exchange device 3 is cooled and depressurized to ensure that the fuel above the furnace 1 falls normally into the furnace 1 for combustion, and at the same time, prevent the high-temperature gas from being discharged from the feed port of the furnace 1 and burning and damaging the material conveying mechanism.

[0026] The installation position of the pressure sensor 6 on the heat exchange device 3 is arranged opposite to the connection point between the hot air duct 2 and the heat exchange device 3. The pressure sensor 6 is a flexible sensor. The flexible sensor has good durability and wear resistance, and can extend its service life to a certain extent.

[0027] A sealing plate 5 is provided on the outside of the hot air duct 2. The sealing plate 5 forms a normal temperature air cavity 4 with the outer wall of the furnace 1, the outer wall of the hot air duct 2 and the outer wall of the heat exchange device 3. The normal temperature air cavity 4 is connected to the heat exchange device 3. A control switch for controlling the opening and closing of the connecting port is provided at the connection between the normal temperature air cavity 4 and the heat exchange device 3. The sealing plate 5 can further strengthen the isolation effect of the hot air duct 2, reduce the heat loss of the hot air duct 2, and prevent operators from touching the hot air duct 2, thereby improving the safety of the equipment. The sealing plate 5 is annular. In this embodiment, the normal temperature air cavity 4 is spiral. In this way, when the box heat exchange device 3 is filled with gas, a mixed cyclone is quickly formed at the edge to reduce temperature and pressure. In this embodiment, a spiral channel is provided on the outer wall of the hot air duct 2, and a spiral channel is provided on the inner wall of the sealing plate 5, thereby forming a spiral air cavity.

[0028] A heat insulation layer is arranged outside the hot air duct 2 to reduce the heat loss of the gas in the hot air duct 2.

[0029] The control switch includes a baffle and a switch plate (not shown in the figure) for closing the connection between the normal temperature air cavity 4 and the heat exchange device 3. The switch plate is hinged on the inner wall of the normal temperature air cavity 4, and the baffle is used to prevent the switch plate from moving away from the heat exchange device 3. When the hot blast furnace needs to be depressurized, gas is filled into the normal temperature air cavity 4, and the switch plate is opened under the action of the gas, and the gas enters the heat exchange device 3 for cooling. The control switch is controlled to connect the normal temperature air cavity 4 with the heat exchange device 3, and normal temperature air is filled into the normal temperature air cavity 4, so that the normal temperature air enters the heat exchange device 3 and mixes with the original hot air to form a mixed cyclone for cooling and depressurization.

[0030] The specific implementation process is as follows:

[0031] The pressure sensor 6 detects the internal pressure of the heat exchange device 3 in real time. When the pressure reaches 100-200KP, normal temperature air is filled into the normal temperature air cavity 4. Under the action of the normal temperature air, the switch plate moves toward the heat exchange device 3, so that the normal temperature air cavity 4 is connected with the heat exchange device 3. The normal temperature air enters the heat exchange device 3 and mixes with the original hot air to form a mixed cyclone to reduce the temperature and pressure. The raw materials fall normally into the furnace 1, which also avoids the high temperature gas being discharged from the feed port of the furnace 1 and burning and damaging the material conveying mechanism.

[0032] This solution uses a sealing plate 5 to form a normal temperature air cavity 4 outside the heat exchange pipe. The sealing plate 5 can further strengthen the isolation effect of the hot air pipe 2, reduce the heat loss of the hot air pipe 2, and prevent operators from touching the hot air pipe 2, thereby improving the safety of the equipment. The normal temperature air cavity 4 formed by the sealing plate 5 is convenient for filling the heat exchange device 3 with normal temperature gas, and cooling and reducing the pressure at the heat exchange device 3, so that the raw materials can fall into the furnace 1 normally and avoid damage to the material conveying mechanism due to high temperature. The pressure in the heat exchange device 3 is measured in real time by the pressure sensor 6, and the temperature and pressure are reduced in time at the heat exchange device 3.

[0033] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical schemes and / or characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several variations and improvements can be made without departing from the technical scheme of the utility model. In the utility model, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances. The scope of protection claimed in this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. Hot air furnace pressure monitoring and control system, including: A furnace, a hot air duct and a heat exchange device connected in sequence, characterized in that the heat exchange device is provided with a pressure sensor for monitoring the internal pressure of the heat exchange device, a sealing plate is provided on the outside of the hot air duct, the sealing plate and the outer wall of the furnace, the outer wall of the hot air duct and the outer wall of the heat exchange device form a normal temperature air cavity, the normal temperature air cavity is connected with the heat exchange device, and a control switch for controlling the opening and closing of the connecting port is provided at the connection between the normal temperature air cavity and the heat exchange device.

2. The hot blast furnace pressure monitoring and control system according to claim 1 is characterized in that: The control switch includes a baffle and a switch plate for closing the connection between the normal temperature air cavity and the heat exchange device. The switch plate is hinged on the inner wall of the normal temperature air cavity, and the baffle is used to prevent the switch plate from moving away from the heat exchange device.

3. The hot blast furnace pressure monitoring and control system according to claim 1 is characterized in that: The sealing plate is in the shape of a circular ring.

4. The hot blast furnace pressure monitoring and control system according to claim 3 is characterized in that: The normal temperature air cavity is spiral-shaped.

5. The hot blast furnace pressure monitoring and control system according to claim 1 is characterized in that: A heat insulation layer is arranged on the outside of the hot air duct.

6. The hot blast furnace pressure monitoring and control system according to claim 1, characterized in that: The installation position of the pressure sensor on the heat exchange device is arranged opposite to the connection point between the hot air duct and the heat exchange device.

7. The hot blast furnace pressure monitoring and control system according to claim 1 is characterized in that: A feeding port is arranged at the top of the furnace, and a conical discharge port is arranged at the bottom of the furnace.

8. The hot blast furnace pressure monitoring and control system according to claim 1, characterized in that: The heat exchange device and the communication port of the normal temperature air cavity are arranged obliquely.

9. The hot blast furnace pressure monitoring and control system according to claim 1, characterized in that: The pressure sensor is a flexible sensor.

10. The hot blast furnace pressure monitoring and control system according to claim 1, characterized in that: The diameter of the hot air duct gradually increases from the furnace to the heat exchange device.

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