TWI652349B - Cooling system and method for blast furnace - Google Patents

Abstract

The cooling system of the blast furnace body includes a plurality of electric circulation pumps and a plurality of fuel circulation pumps respectively connected to the cooling water pipes side by side. The electric circulation pump supplies cooling water to the high temperature furnace body through the cooling water pipe during the normal operation of the cooling system for heat exchange. The fuel circulation pump supplies cooling water to the high temperature furnace body through the cooling water pipe for heat exchange in the emergency operation stage of the cooling system. When the cooling system is in the normal operating phase, the electric circulation pump is turned on and the fuel circulation pump is turned off. When each electric circulation pump is not working properly, the cooling system will enter the emergency operation phase to start the fuel circulation pump in sequence.

Description

Cooling system of blast furnace body and method thereof

The present disclosure relates to a cooling system for a blast furnace body, and more particularly to a cooling system for a blast furnace body and a method therefor.

The main function of the cooling system of the blast furnace body is to remove the heat energy generated during the reduction of the chemical reaction inside the blast furnace, and to avoid the rapid attenuation of the mechanical strength of the blast furnace shell as the temperature of the furnace shell increases, thereby maintaining the strength of the blast furnace shell to avoid deformation of the furnace shell. It may happen when redness, burning, etc. occur. Therefore, the design of the cooling system of the blast furnace body has an inseparable relationship with the life of the blast furnace body.

In addition to the electric circulation pump used in normal operation, the conventional blast furnace furnace cooling system considers other emergency operation procedures. For example, when the power is interrupted, the emergency water tower about 60 meters above the ground is used for water supply cooling. . However, the installation of emergency water towers has the following disadvantages: (1) The construction of emergency water towers and soft water pools increases the cost of blast furnace furnace construction; (2) In order to supplement the water volume in emergency water towers, several additional emergency water towers are required. It is difficult to improve the space planning and configuration of the pump house; (3) The operation valve group and the expansion joint shall be provided on the pipeline connecting the emergency water tower and the water supply main line, and the emergency water tower shall be provided with inspections such as ladders and platforms. And maintenance related equipment Prepare, improve the difficulty of inspection and maintenance work, and expose the inspection and maintenance staff to the dangerous environment at high altitude; (4) If it is located in the cold zone, consider adding antifreeze to the emergency water tower. Or carry out insulation work to avoid the formation of ice in the emergency water tower; (5) in the emergency water tower supply phase, the cooling system of the blast furnace body is changed to an open circulation system, which means cooling of the blast furnace body The water quality of the water may be contaminated by external sources of pollution, which may result in poor cooling.

The purpose of the disclosure is to provide a cooling system for a blast furnace body and a method thereof, and a plurality of fuel circulation pumps are provided instead of the emergency water tower, and the fuel circulation pump is used to start when the power is interrupted, and is used as a backup cooling water circulation pump for conventional use. The shortcomings derived from the emergency water tower have been improved.

According to the above object of the present disclosure, a cooling system for a blast furnace body is proposed, comprising a plurality of electric circulation pumps and a plurality of fuel circulation pumps respectively connected to the cooling water pipes side by side. The electric circulation pump supplies cooling water to the high temperature furnace body through the cooling water pipe during the normal operation of the cooling system for heat exchange. The fuel circulation pump supplies cooling water to the high temperature furnace body through the cooling water pipe for heat exchange in the emergency operation stage of the cooling system. When the cooling system is in the normal operating phase, the electric circulation pump is turned on and the fuel circulation pump is turned off. When each electric circulation pump fails to operate normally, the cooling system enters an emergency operation phase, and the fuel circulation pump is sequentially started.

In some embodiments, the fuel circulation pump is a diesel circulation pump, wherein the fuel circulation is initiated when the cooling system is in an emergency operation phase One of the ring pumps, and when the one of the fuel circulation pumps is not functioning properly, activates the other of the fuel circulation pumps.

In some embodiments, the cooling system of the blast furnace body further includes a control valve, and two ends of the control valve are respectively connected to the cooling system and the indirect water supply source, wherein when the cooling system is in an emergency operation stage and each fuel circulation pump is not normal In operation, the control valve is opened to provide indirect water through the cooling water pipe to the high temperature furnace for heat exchange.

In some embodiments, the cooling system of the blast furnace body further comprises a soft water pool disposed downstream of the cooling system. When the control valve is opened, the soft water pool is used to collect the water discharged after the heat exchange.

In some embodiments, when the cooling system is in a normal operating phase, the cooling system is a closed circulation system, wherein when the cooling system is in an emergency operating phase, the cooling system is a closed circulation system.

In some embodiments, when the control valve is open, the cooling system is an open circulation system.

According to the above object of the present disclosure, a cooling method for a blast furnace body includes: providing a plurality of electric circulation pumps and a plurality of fuel circulation pumps respectively connected to the cooling water pipes side by side; performing a normal operation phase to start the electric circulation pump To provide cooling water to the high temperature furnace through the cooling water pipe for heat exchange; and when each electric circulation pump is unable to operate normally, perform an emergency operation phase, sequentially start the fuel circulation pump to provide cooling water to the high temperature furnace through the cooling water pipe The body performs heat exchange.

In some embodiments, the fuel circulation pump is a diesel cycle A pump, wherein one of the fuel circulation pumps is activated when an emergency operation phase is performed, and the other of the fuel circulation pumps is activated when the one of the fuel circulation pumps is not functioning properly.

In some embodiments, the cooling method of the blast furnace body further includes providing a control valve, wherein two ends of the control valve are respectively connected to the cooling water pipe and the indirect water supply source, wherein when the emergency operation phase is performed and each fuel circulation pump is not normal In operation, the control valve is opened to provide indirect water through the cooling water pipe to the high temperature furnace for heat exchange.

In some embodiments, the cooling method of the blast furnace body further comprises providing a soft water pool, and when the control valve is opened, collecting the water discharged between the heat exchange through the soft water pool.

The above described features and advantages of the present invention will be more apparent from the following description.

100‧‧‧ cooling system

110‧‧‧Electric circulation pump

110a‧‧‧Low-voltage electric circulating pump

110b‧‧‧High-voltage electric circulating pump

120‧‧‧fuel circulation pump

130‧‧‧Cooling element equipment

140‧‧‧Blowing nozzle components

150‧‧‧Expansion tank

160‧‧‧ heat exchanger

170‧‧‧Control valve

180‧‧‧soft water pool

1000‧‧‧ cooling method

1100~1400‧‧‧ steps

A better understanding of the aspects of the present disclosure can be obtained from the following detailed description taken in conjunction with the drawings. It should be noted that, according to industry standard practices, the features are not drawn to scale. In fact, in order to make the discussion clearer, the dimensions of each feature can be arbitrarily increased or decreased.

FIG. 1 is a schematic view showing a cooling system of a blast furnace body according to an embodiment of the present disclosure in a normal operation stage.

2 is a schematic view showing a cooling system of a blast furnace body according to an embodiment of the present disclosure in an emergency operation phase.

3 is a schematic view showing a cooling system of a blast furnace body according to an embodiment of the present disclosure in an emergency operation phase and each fuel circulation pump is unable to operate normally.

FIG. 4 is a flow chart showing a cooling method of a blast furnace body according to an embodiment of the present disclosure.

Embodiments of the invention are discussed in detail below. However, it will be appreciated that the embodiments provide many applicable concepts that can be implemented in a wide variety of specific content. The examples discussed and disclosed are illustrative only and are not intended to limit the scope of the invention.

FIG. 1 is a schematic view showing a cooling system 100 of a blast furnace body according to an embodiment of the present disclosure in a normal operation stage. The cooling system 100 includes an electric circulation pump 110 and a fuel circulation pump 120. The electric circulation pump 110 includes a low pressure electric circulation pump 110a and a high pressure electric circulation pump 110b. It should be noted that the number of the low-voltage electric circulation pump 110a, the high-pressure electric circulation pump 110b and the fuel circulation pump 120 illustrated in FIG. 1 is merely an example, and the disclosure is not limited thereto.

The cooling system 100 further includes a cooling element device 130, a blast nozzle element 140, an expansion tank 150, and a heat exchanger 160. When the power of the cooling system 100 is normally supplied and the fuel circulation pump 120 can operate normally, the cooling system 100 is in a normal operation phase, the electric circulation pump 110 is turned on, and the fuel circulation pump 120 is turned off, and the electric circulation pump 110 drives the cooling water to be cooled. The water pipe flows through the cooling element device 130 and the blower nozzle member 140 to remove thermal energy generated when the chemical reaction inside the blast furnace body is chemical.

It is worth mentioning that since the thermal energy generated by the blaster element 140 is higher than the thermal energy generated by the cooling element device 130, the high-pressure electric circulating pump 110b is required to pressurize the cooling water to enhance the cooling system. The cooling effect of 100 pairs of blaster elements 140.

The expansion tank 150 is for absorbing the volume change of the cooling water due to the change of the water temperature. Further, the expansion tank 150 pressurizes the cooling water by introducing nitrogen gas to increase the boiling point of the cooling water, so that the cooling water is less likely to be vaporized. Furthermore, the worker can know whether or not the cooling system 100 is leaking by the liquid level change of the expansion tank 150.

The heat exchanger 160 is for cooling the cooling water whose temperature rises due to heat exchange. When the cooling water flows through the cooling element device 130 and the air blowing nozzle element 140 to perform heat exchange cooling, the temperature of the cooling water rises. Therefore, the cooling water is cooled by the heat exchanger 160.

It should be noted that when the cooling system 100 is driven by the electric circulation pump 110 to cool the cooling water, the cooling water is continuously circulated by the electric circulation pump 110. At this time, the cooling system 100 is a closed circulation system, which makes the cooling system 100 maintains better cooling efficiency.

When the electric circulation pump 110 fails to operate normally (that is, if the power supply is interrupted or the electric circulation pump 110 fails), the cooling system 100 is switched to the emergency operation stage, so that the cooling system 100 can continuously remove the internal chemical reaction of the blast furnace body. The heat energy generated during the time. When the cooling system 100 is in an emergency operating phase, the cooling system 100 sequentially activates the fuel circulation pump 120.

2 is a schematic view showing the cooling system 100 of the blast furnace body in an emergency operation stage according to an embodiment of the present disclosure. For example, when it is cold While the system 100 is in an emergency operation phase, one of the fuel circulation pumps 120 is activated, and one of the fuel circulation pumps 120 drives the cooling water to pass through the cooling water pipe, through the cooling element device 130, and the blower member 140 to remove The heat energy generated during the chemical reaction inside the blast furnace body. Also, when the cooling system 100 is in an emergency operation phase and one of the fuel circulation pumps 120 is not functioning properly, the other of the fuel circulation pumps 120 is activated.

In the present embodiment, since more than two fuel circulation pumps 120 are provided, as long as at least one fuel circulation pump 120 can operate normally, the cooling system 100 can continuously remove the chemical reaction inside the blast furnace body during the emergency operation phase. The heat generated. In the present embodiment, the fuel circulation pump 120 is a diesel circulation pump. Since the diesel circulation pump is powered by the diesel generator, it is not affected by the interruption of the mains supply, and the internal chemical reaction of the blast furnace body can be continuously removed during the emergency operation phase. The heat energy generated during the time.

It should be noted that when the cooling system 100 is driven by the fuel circulation pump 120 to cool the cooling water, the cooling water is continuously circulated by the fuel circulation pump 120. At this time, the cooling system 100 is a closed circulation system, which makes the cooling system 100 maintains better cooling efficiency.

FIG. 3 is a schematic diagram showing the cooling system 100 of the blast furnace body according to the embodiment of the present disclosure in an emergency operation phase and each fuel circulation pump is unable to operate normally. The cooling system 100 further includes a control valve 170 and a soft water pool 180. Both ends of the control valve 170 are connected to the cooling system 100 and the indirect water supply source, respectively. When the cooling system 100 is in an emergency operation phase and each fuel circulation pump 120 is not functioning properly, the operator can introduce the indirect water by opening the control valve 170 so that the cooling system 100 can continuously remove the blast furnace. The heat generated during the chemical reaction inside the furnace.

It should be noted that when the cooling system 100 is cooled by indirect water, the indirect water of the cooling system 100 is not driven by the circulation pump and is therefore an open circulation system. At this time, the cooling system 100 passes through the soft water pool 180 disposed downstream of the cooling system 100 to collect the water that is discharged after the heat exchange.

4 is a flow chart showing a method 1000 of cooling a blast furnace body in accordance with an embodiment of the present disclosure. At step 1100, a plurality of electric circulation pumps and a plurality of fuel circulation pumps are provided, which are respectively connected side by side to the cooling water pipe. In step 1200, a normal operation phase is performed to start an electric circulation pump to provide cooling water to the high temperature furnace through the cooling water pipe for heat exchange. In step 1300, when each electric circulation pump is unable to operate normally, an emergency operation phase is performed, and the fuel circulation pump is sequentially started to supply cooling water to the high temperature furnace body through the cooling water pipe for heat exchange. In step 1400, a control valve and a soft water pool are provided. When the emergency operation phase is performed and each fuel circulation pump is unable to operate normally, the control valve is opened to provide indirect water through the cooling water pipe to the high temperature furnace body for heat exchange, and through the soft water pool. To collect the water that is discharged after the heat exchange.

As can be seen from the above, the cooling system of the blast furnace body of the present disclosure is provided with a plurality of fuel circulation pumps for starting when the power is interrupted, as a backup cooling water circulation pump. In addition, since the cooling system of the blast furnace body disclosed in the present disclosure is provided with more than two fuel circulation pumps, the cooling system can continuously remove the internal chemical reaction of the blast furnace body in the emergency operation stage as long as at least one fuel circulation pump can operate normally. The heat energy generated during the time. Furthermore, the blast furnace body disclosed in the present disclosure The cooling system is further provided with a control valve connected to the indirect water supply source. When the electric circulation pump and the fuel circulation pump are unable to operate normally, the control valve can be opened to guide the indirect water so that the cooling system can be continuously removed. The heat energy generated during the chemical reaction inside the blast furnace body.

It is worth mentioning that compared with the conventional cooling system of the blast furnace body, the cooling system of the blast furnace body disclosed in the present disclosure does not need to be provided with an additional emergency water tower, and does not need to be installed in the tube connecting the emergency water tower and the water supply main line. The operating valve group and the expansion joint on the line, therefore, the cooling system of the blast furnace body disclosed in the present invention has the following advantages: (1) saving the cost of the blast furnace body construction; (2) reducing the space planning and configuration of each component of the blast furnace body Difficulty; (3) making daily inspection and maintenance work simple and safe; (4) in the emergency operation phase of the fuel circulation pump operating for cooling, the cooling system is a closed circulation system to avoid cooling of the blast furnace body The water quality of the water is contaminated by external sources of pollution and maintains a good cooling effect.

The features of several embodiments are summarized above, and those skilled in the art will be able to understand the aspects of the disclosure. Those skilled in the art will appreciate that the present disclosure can be readily utilized as a basis for designing or modifying other processes and structures, thereby achieving the same objectives and/or achieving the same advantages as the embodiments described herein. . It should be understood by those skilled in the art that the invention may be made without departing from the spirit and scope of the disclosure.

Claims (8)

A cooling system for a blast furnace body includes: a plurality of electric circulation pumps respectively connected to a cooling water pipe side by side to provide a cooling water to a high temperature furnace body through a cooling water pipe in a normal operation phase of the cooling system Heat exchange; a plurality of fuel circulation pumps are respectively connected to the cooling water pipe side by side to provide the cooling water to the high temperature furnace body for heat exchange through the cooling water pipe in an emergency operation phase of the cooling system; and a control valve The two ends of the control valve are respectively connected to the cooling system and an indirect water supply source; when the cooling system is in the normal operation phase, the electric circulation pumps are turned on, and the fuel circulation pumps are turned off; When the electric circulation pumps are unable to operate normally, the cooling system enters the emergency operation phase, and the fuel circulation pumps are sequentially started; when the cooling system is in the emergency operation phase and each of the fuel circulation pumps cannot operate normally The control valve is opened to provide an indirect water through the cooling water pipe to the high temperature furnace body for heat exchange. The cooling system of the blast furnace body according to claim 1, wherein the fuel circulation pump is a diesel circulation pump, wherein when the cooling system is in the emergency operation phase, one of the fuel circulation pumps is activated, And when the one of the fuel circulation pumps is not functioning properly, the other of the fuel circulation pumps is activated. The cooling system of the blast furnace body according to claim 1, further comprising: a soft water pool disposed downstream of the cooling system; and when the control valve is opened, collecting the heat exchange through the soft water pool The indirect water discharged. The cooling system of the blast furnace body according to claim 1, wherein when the cooling system is in the normal operation phase, the cooling system is a closed circulation system, wherein when the cooling system is in the emergency operation phase, The cooling system is a closed circulation system. The cooling system of the blast furnace body according to claim 1, wherein when the control valve is opened, the cooling system is an open circulation system. A cooling method for a blast furnace body, comprising: providing a plurality of electric circulation pumps and a plurality of fuel circulation pumps respectively connected to a cooling water pipe side by side; providing a control valve, the two ends of the control valve being respectively connected to the cooling water pipe And an indirect water supply source; performing a normal operation phase to activate the electric circulation pumps to provide a cooling water through the cooling water pipe to a high temperature furnace body for heat exchange; when each of the electric circulation pumps fails to operate normally When making an emergency In the operation phase, the fuel circulation pumps are sequentially activated to supply the cooling water to the high temperature furnace body through the cooling water pipe for heat exchange; and when the emergency operation phase is performed and each of the fuel circulation pumps is not functioning properly, The control valve is opened to provide an indirect water through the cooling water pipe to the high temperature furnace body for heat exchange. The method for cooling a blast furnace body according to claim 6, wherein the fuel circulation pump is a diesel circulation pump, wherein when the emergency operation phase is performed, one of the fuel circulation pumps is activated, and when When the one of the fuel circulation pumps is not functioning properly, the other of the fuel circulation pumps is activated. The method for cooling a blast furnace body according to claim 6, further comprising: providing a soft water pool, and collecting the indirect water discharged after the heat exchange through the soft water pool when the control valve is opened.