Device for controlling temperature of power medium of blast furnace injection system by using waste heat

Abstract

The utility model discloses a device for controlling the temperature of a power medium of a blast furnace injection system by using waste heat, which comprises a medium input pipe, a normal temperature pipe, a heating inlet pipe, a heat conduction pipe, a heating outlet pipe, a mixed temperature control chamber, a medium output pipe and a flue gas furnace, an outlet of the heat conduction pipe is connected with the heating outlet pipe, the heat conduction pipe is wound on the outer wall of the flue gas furnace in a spiral fit mode, the heating outlet pipe and the normal temperature pipe are connected to the mixing temperature control chamber together, and the medium output pipe is connected out of the mixing temperature control chamber. The device is used for heating a power medium of a blowing system, traditional energy consumption modes such as steam heating and electric heating are abandoned, waste heat of a furnace shell of a flue gas furnace in a coal pulverizing system is fully utilized, only existing pipelines and valves need to be properly modified, additional heating equipment does not need to be added, and the energy-saving and environment-friendly effects are achieved. Therefore, the traditional heating mode can be replaced, the energy consumption is reduced, and the production cost is also reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of blast furnace coal injection process equipment, in particular to a device for controlling the temperature of a power medium of a blast furnace injection system by utilizing waste heat. Background Art

[0002] In the blast furnace coal injection process, the power medium for conveying coal powder is mainly nitrogen, air, etc. In order to keep the coal powder at a certain temperature and good fluidity during the transportation process, heating of the conveying power medium is an indispensable link. The commonly used heating methods are electric heating, steam heating, etc. The heating process will increase additional energy consumption and operating costs.

[0003] The flue gas furnace of the pulverizing system is mainly used to generate high-temperature dry gas to dry the pulverized coal. During the production process, the surface temperature of the flue gas furnace shell is usually directly lost to the air, resulting in a certain amount of heat waste. Whether this part of the heat can be reused to maximize its application effect is the problem to be solved by this application. Utility Model Content

[0004] The purpose of the utility model is to provide a device for controlling the temperature of the power medium of the blast furnace injection system by utilizing waste heat in view of the above situation. The device has a simple structural design and utilizes the waste heat from the flue gas furnace to achieve the purpose of energy saving and consumption reduction.

[0005] The specific scheme of the utility model is: a device for controlling the temperature of the power medium of the blast furnace injection system by utilizing waste heat, comprising a medium input pipe, a normal temperature pipe, a heating inlet pipe, a heat conducting pipe, a heating outlet pipe, a mixed temperature control chamber, a medium output pipe and a flue gas furnace, wherein the medium input pipe is divided into two and is simultaneously connected with the normal temperature pipe and the heating inlet pipe, the heating inlet pipe is connected with the inlet of the heat conducting pipe, the outlet of the heat conducting pipe is connected with the heating outlet pipe, the heat conducting pipe is spirally wound on the outer wall of the flue gas furnace, the heating outlet pipe and the normal temperature pipe are connected together to the mixed temperature control chamber, and the medium output pipe is connected from the mixed temperature control chamber.

[0006] Furthermore, in the utility model, a first shut-off valve and a first regulating valve are sequentially arranged on the normal temperature pipe, a second shut-off valve is arranged on the heating inlet pipe, and a second regulating valve is arranged on the heating outlet pipe.

[0007] Furthermore, the heat-conducting pipe in the utility model is fitted and wound on the outer wall of the flue gas furnace, the winding gap of the heat-conducting pipe is filled with heat-conducting filler, and a heat-insulating reflective layer is wrapped around the outside of the heat-conducting pipe and the heat-conducting filler.

[0008] Furthermore, the flue gas furnace described in the utility model is a cylindrical flue gas furnace.

[0009] Furthermore, a temperature gauge is also provided on the medium output pipe in the utility model, and the temperature gauge is used to monitor the temperature of the medium in the medium output pipe in real time.

[0010] Furthermore, the heat conduction pipe described in the utility model is made of a seamless steel pipe, and the diameter of the heat conduction pipe is consistent with the diameters of the heating inlet pipe and the heating outlet pipe.

[0011] In the direct injection mode of the blast furnace coal injection process, the pulverizing system is often operated simultaneously with the injection system, so the generation of waste heat from the flue gas furnace shell of the pulverizing system is relatively stable.

[0012] The device of the utility model is used to heat the power medium of the injection system, abandoning the traditional energy-consuming methods such as steam heating and electric heating, so that the waste heat of the furnace shell of the flue gas furnace in the powder making system can be fully utilized. Only the existing pipelines and valves need to be properly modified, and no additional heating equipment is needed to replace the traditional heating method, which not only reduces energy consumption, but also reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the main viewing direction structure of the utility model;

[0014] Figure 2 It is a schematic cross-sectional view of the fitting of the heat conducting pipe and the furnace shell of the flue gas furnace in the utility model.

[0015] In the figure: 1—medium output pipe, 2—temperature gauge, 3—mixing temperature control chamber, 4—first regulating valve, 5—heating outlet pipe, 6—normal temperature pipe, 7—heating inlet pipe, 8—first shut-off valve, 9—medium input pipe, 10—second shut-off valve, 11—flue gas furnace, 12—heat conducting pipe, 13—second regulating valve, 14—thermal insulation reflective layer, 15—thermal conductive filling material, 16—flue gas furnace shell. DETAILED DESCRIPTION

[0016] The following will be combined with the accompanying drawings of the utility model to clearly and completely describe the technical solution of the utility model. It is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the utility model. In the description of the utility model, it should be noted that the terms "upper", "lower", "inside", "outside" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when used, which is only for the convenience of describing the utility model or simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0017] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", and "connect" 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 a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] See also Figure 1 , Figure 2 The utility model is a device for controlling the temperature of the power medium of the blast furnace injection system by utilizing waste heat, comprising a medium input pipe 9, a normal temperature pipe 6, a heating inlet pipe 7, a heat conduction pipe 12, a heating outlet pipe 5, a mixed temperature control chamber 3, a medium output pipe 1 and a flue gas furnace 11. Further, the flue gas furnace described in the utility model is a cylindrical flue gas furnace, wherein the medium input pipe is divided into two and is connected to the normal temperature pipe and the heating inlet pipe at the same time, the heating inlet pipe is connected to the inlet of the heat conduction pipe, the outlet of the heat conduction pipe is connected to the heating outlet pipe, and the heat conduction pipe is spirally wound around the medium input pipe. On the outer wall of the flue gas furnace, further, the heat-conducting pipe described in the utility model is fitted and wound on the outer wall of the flue gas furnace, the winding gap of the heat-conducting pipe is filled with heat-conducting filler 15, and a heat-insulating reflective layer 14 is wrapped around the outside of the heat-conducting pipe and the heat-conducting filler. The heating outlet pipe and the normal temperature pipe are connected to the mixing temperature control chamber 3 together, and the medium output pipe is connected from the mixing temperature control chamber; further, the normal temperature pipe described in the utility model is sequentially provided with a first shut-off valve 8 and a first regulating valve 4, the heating inlet pipe is provided with a second shut-off valve 10, and the heating outlet pipe is provided with a second regulating valve 13.

[0019] Furthermore, the medium output pipe in this embodiment is also provided with a temperature gauge 2, which is used to monitor the medium temperature in the medium output pipe in real time. Furthermore, the heat conduction pipe in this utility model is made of seamless steel pipe, and the diameter of the heat conduction pipe is consistent with the diameter of the heating inlet pipe and the heating outlet pipe.

[0020] In the direct injection mode of the blast furnace coal injection process, the pulverizing system is often operated simultaneously with the injection system, so the generation of waste heat from the flue gas furnace shell of the pulverizing system is relatively stable.

[0021] When the utility model is actually used, it is specifically implemented as follows:

[0022] like Figure 1As shown, the medium input pipe 9 of the device system is connected to the power medium network. After the power medium enters, it is divided into two paths. One path passes through the first shut-off valve 8 and the first regulating valve 4 to reach the mixing temperature control chamber 3, which is a normal temperature power medium; the other path passes through the second shut-off valve 10 to enter the heat transfer pipe 12 for heating, and then comes out of the heat transfer pipe through the second regulating valve 13 to reach the mixing temperature control chamber 3. The two paths of normal temperature and high temperature power media are regulated by the first regulating valve and the second regulating valve respectively, and are mixed in a certain proportion to reach the specified temperature, and are output from the medium output pipe to the coal powder conveying power medium network of the injection system.

[0023] Among them, the heat pipe is laid in a spiral ring shape to fit the surface of the cylindrical flue gas furnace. The gap of the heat pipe is filled with heat-conducting filling material, and the outer layer is covered with a thermal insulation reflective layer to fully collect and utilize the waste heat of the flue gas furnace shell.

[0024] Control method: In normal production, such as Figure 1 , open the first shut-off valve, the normal temperature power medium directly passes through, open the second shut-off valve, the normal temperature power medium enters the heat transfer pipe for heating and then passes through, observe the temperature on the thermometer, if the temperature is higher than the specified temperature, the first regulating valve opening increases, while the second regulating valve opening decreases, if the temperature is lower than the specified temperature, the first regulating valve opening decreases, while the second regulating valve opening increases. The adjustment ratio is adjusted according to the first regulating valve opening + the second regulating valve opening = 100%.

[0025] The device of the utility model is used to heat the power medium of the injection system, abandoning the traditional energy-consuming methods such as steam heating and electric heating, so that the waste heat of the furnace shell of the flue gas furnace in the powder making system can be fully utilized. Only the existing pipelines and valves need to be properly modified, and no additional heating equipment is needed to replace the traditional heating method, which not only reduces energy consumption, but also reduces production costs.

Claims

1. A device for controlling the temperature of the power medium of a blast furnace injection system using waste heat, characterized in that: It includes a medium input pipe, a normal temperature pipe, a heating inlet pipe, a heat conduction pipe, a heating outlet pipe, a mixing temperature control chamber, a medium output pipe and a flue gas furnace, wherein the medium input pipe is divided into two and is connected to the normal temperature pipe and the heating inlet pipe at the same time, the heating inlet pipe is connected to the inlet of the heat conduction pipe, the outlet of the heat conduction pipe is connected to the heating outlet pipe, the heat conduction pipe is spirally wound on the outer wall of the flue gas furnace, the heating outlet pipe and the normal temperature pipe are connected to the mixing temperature control chamber together, and the medium output pipe is connected from the mixing temperature control chamber.

2. The device for controlling the temperature of the power medium of the blast furnace injection system by utilizing waste heat according to claim 1, characterized in that: The normal temperature pipe is provided with a first cut-off valve and a first regulating valve in sequence, the heating inlet pipe is provided with a second cut-off valve, and the heating outlet pipe is provided with a second regulating valve.

3. The device for controlling the temperature of the power medium of the blast furnace injection system by utilizing waste heat according to claim 1, characterized in that: The heat-conducting pipe is fitted and wound on the outer wall of the flue gas furnace, the winding gap of the heat-conducting pipe is filled with heat-conducting filler, and a heat-insulating reflective layer is wrapped around the outside of the heat-conducting pipe and the heat-conducting filler.

4. The device for controlling the temperature of the power medium of the blast furnace injection system by utilizing waste heat according to claim 1, characterized in that: The flue gas furnace is a cylindrical flue gas furnace.

5. The device for controlling the temperature of the power medium of the blast furnace injection system by utilizing waste heat according to claim 1, characterized in that: The medium output pipe is also provided with a temperature gauge, and the temperature gauge is used to monitor the medium temperature in the medium output pipe in real time.

6. The device for controlling the temperature of the power medium of the blast furnace injection system by utilizing waste heat according to claim 1, characterized in that: The heat conduction pipe is made of seamless steel pipe, and the pipe diameter of the heat conduction pipe is consistent with the pipe diameters of the heating inlet pipe and the heating outlet pipe.

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