Device and method for increasing blast furnace gas temperature through hot blast stove waste gas

Abstract

The invention relates to a device for increasing blast furnace gas temperature by using hot blast stove waste gas, which comprises a blast furnace top, a dust remover and a dry dedusting system which are connected in sequence, a clean gas main pipe at an outlet of the dry dedusting system is respectively connected with a TRT generator and a clean gas pipe network, and a gas heating mixing tank is additionally arranged on an inlet pipeline of the dry dedusting system. The gas heating mixing tank is connected with the waste gas preheating clean gas device through a preheating clean gas pipeline, the waste gas preheating clean gas device is connected with the clean gas main pipe through a pipeline, and the waste gas preheating clean gas device is sequentially connected with the preheater and the hot blast stove through pipelines. According to the invention, the blast furnace gas discharged from the blast furnace top is heated by using the waste heat of the hot blast furnace exhaust gas, so that the problem that the blast furnace gas temperature does not meet the gas inlet temperature requirement of a dry dedusting system due to low blast furnace top temperature and is forced to diffuse can be solved. And the problems of environmental pollution and the like caused by blast furnace gas diffusion are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgical ironmaking blast furnace ironmaking, and in particular to a method for increasing the temperature of blast furnace coal gas by utilizing hot blast furnace waste gas. Background Art

[0002] A large amount of blast furnace gas is produced during the blast furnace ironmaking process, and the output per ton of iron is as high as 1300-1800Nm 3 , is the largest combustible gas in the output of steel enterprises. On the one hand, this part of combustible gas can be used directly as fuel for other users, and on the other hand, it can be used to generate electricity by utilizing its high temperature and high pressure characteristics. No matter what kind of utilization method is adopted for the blast furnace gas in the next step, it must be dusted before use. Up to now, the dust removal of blast furnace gas discharged from the top of blast furnace at home and abroad is usually completed in two steps. The first step is to use inertial dust collector for rough dust removal, such as using gravity dust collector or cyclone dust collector for rough dust removal; the second step is fine dust removal, which usually has the following two methods: 1) Wet method. This method uses an annular seam washing device or a double-text scrubber to purify blast furnace gas. Wet dust removal has the advantages of mature and reliable system and low investment, but wet dust removal consumes a lot of water resources, which reduces the temperature of blast furnace gas to below 70°C, wasting the waste heat resources of blast furnace gas. 2) Dry bag dust removal: This method uses bag dust collectors to purify blast furnace gas. Dry bag dust removal has the advantages of low system resistance, high purification efficiency, no need for a turbid water system, and the ability to recycle waste heat from blast furnace gas. However, bag dust collectors are not very adaptable to changes in blast furnace gas temperature. Due to changes in blast furnace operating conditions, the temperature of blast furnace gas often falls below the dew point temperature. At this temperature, the dry dust removal system will experience a "bag sticking" phenomenon, which will lead to increased resistance during filtration, deterioration of dust removal effects, dust ash compaction, and blockage of ash delivery pipelines, which will seriously affect the safe and reliable operation of the dust removal system. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a method for increasing the temperature of blast furnace gas by utilizing hot blast furnace exhaust gas, thereby solving the problem that blast furnace gas is forced to be released because its temperature is too low and does not meet the temperature requirement of a dry dust removal system.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A device for increasing the temperature of blast furnace gas by using hot blast furnace waste gas comprises a blast furnace top, a dust collector and a dry dust removal system which are connected in sequence, the clean gas main pipe at the outlet of the dry dust removal system is respectively connected to a TRT generator and a clean gas pipeline network, a gas heating mixing tank is added to the inlet pipeline of the dry dust removal system, the gas heating mixing tank is connected to a waste gas preheating clean gas device through a preheating clean gas pipeline, the waste gas preheating clean gas device is connected to the clean gas main pipe through a pipeline, and the waste gas preheating clean gas device is connected to a preheater and a hot blast furnace in sequence through a pipeline.

[0006] The dust collector is a gravity dust collector or a cyclone dust collector.

[0007] A pressure regulating valve group is arranged at the front end of the clean gas pipeline network.

[0008] The invention relates to a production method of a device for raising the temperature of blast furnace gas by using waste gas from a hot blast furnace. The raw gas produced by the blast furnace is transported to a dust collector through the top of the blast furnace for raw dust removal to become semi-clean gas. The semi-clean gas enters a dry dust removal system for fine dust removal and then discharges high-pressure clean gas. The waste gas produced by the combustion of the hot blast furnace first enters a preheater to preheat the gas required for production. After preheating, the hot blast furnace waste gas discharged from the preheater at a temperature of ≥180°C enters a waste gas preheating clean gas device. The high-pressure clean gas drawn out from the clean gas main pipe is heated to above 150°C through heat exchange. The heated high-pressure clean gas enters a gas heating mixing tank and is mixed with the semi-clean gas and then enters the dry dust removal system together. The high-pressure clean gas from the clean gas main pipe enters the TRT generator set or the gas network according to the process.

[0009] The inlet gas temperature of the dry dust removal system is required to be between 120 and 220°C.

[0010] The clean gas of the clean gas main pipe enters the gas network after being generated by TRT or pressure-regulated by a pressure-regulating valve group.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] The present invention utilizes the waste heat of hot blast furnace exhaust gas to heat the blast furnace gas discharged from the blast furnace top, and can solve the problem that the blast furnace gas temperature does not meet the gas inlet temperature requirement of the dry dust removal system due to the low temperature of the blast furnace top, and is therefore forced to be released. The present invention fully utilizes the waste heat of hot blast furnace exhaust gas, which not only reduces energy consumption, but also eliminates the environmental pollution caused by the release of blast furnace gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the present invention.

[0014] In the figure: blast furnace roof 1, dust collector 2, dry dust removal system 3, clean gas main 4, TRT generator 5, clean gas pipeline network 6, gas heating mixing tank 7, preheating clean gas pipeline 8, exhaust gas preheating clean gas device 9, preheater 10, hot blast furnace 11, pressure regulating valve group 12. DETAILED DESCRIPTION

[0015] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0016] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means more than two.

[0017] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected 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 by specific circumstances.

[0018] like Figure 1 A device for raising the temperature of blast furnace gas by using hot blast furnace waste gas comprises a blast furnace top 1, a dust collector 2, and a dry dust removal system 3 which are connected in sequence. A clean gas main pipe 4 at the outlet of the dry dust removal system 3 is respectively connected to a TRT generator 5 and a clean gas pipeline network 6. A gas heating mixing tank 7 is added to the inlet pipeline of the dry dust removal system 3. The gas heating mixing tank 7 is connected to a waste gas preheating clean gas device 9 through a preheating clean gas pipeline 8. The waste gas preheating clean gas device 9 is connected to the clean gas main pipe 4 through a pipeline. The waste gas preheating clean gas device 9 is sequentially connected to a preheater 10 and a hot blast furnace 11 through a pipeline.

[0019] The dust collector 2 is a gravity dust collector or a cyclone dust collector.

[0020] A pressure regulating valve group 12 is provided at the front end of the clean gas pipeline network 6 .

[0021] A method for producing a device for raising the temperature of blast furnace gas by using hot blast furnace waste gas. The raw gas produced by blast furnace production is transported to the dust collector 2 through the blast furnace top 1 for raw dust removal to become semi-clean gas. The semi-clean gas enters the dry dust removal system 3 for fine dust removal and then discharges high-pressure clean gas. The waste gas produced by the combustion of the hot blast furnace 11 first enters the preheater 10 to preheat the gas required for production. After preheating, the hot blast furnace waste gas discharged from the preheater 10 at a temperature of ≥180°C enters the waste gas preheating clean gas device 9. The high-pressure clean gas drawn from the clean gas main pipe 4 is heated to above 150°C through heat exchange. The heated high-pressure clean gas enters the gas heating mixing tank 7 and is mixed with the semi-clean gas and then enters the dry dust removal system 3 together. The high-pressure clean gas from the clean gas main pipe 4 enters the TRT generator set 5 or the gas pipeline network 6 according to the process.

[0022] The gas inlet temperature of the dry dust removal system 3 is required to be between 120 and 220°C.

[0023] The clean gas of the clean gas main pipe 4 enters the gas network 6 after being generated by TRT or pressure-regulated by a pressure regulating valve group.

[0024] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. In addition, the various different embodiments of the present invention can also be arbitrarily combined, as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

[0025] In order to make the purpose, technical scheme and technical effect of the present invention clearer, the technical scheme in the embodiment of the present invention is now clearly and completely described. However, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. In combination with the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Example

[0027] A device for increasing the temperature of blast furnace gas by using hot blast furnace waste gas, comprising a blast furnace roof 1, a dust collector 2 (gravity dust collector), and a dry dust removal system 3 connected in sequence, a clean gas main pipe 4 at the outlet of the dry dust removal system 3 connected to a TRT generator 5 and a clean gas pipe network 6 respectively, and a pressure regulating valve group 12 is provided on the clean gas main pipe 4 at the front end of the clean gas pipe network 6. The gas inlet temperature of the dry dust removal system 3 is required to be between 120 and 220°C.

[0028] A gas heating mixing tank 7 is added to the inlet pipeline of the dry dust removal system 3. The gas heating mixing tank 7 is connected to the exhaust gas preheating and clean gas device 9 through a preheating and clean gas pipeline 8. The exhaust gas preheating and clean gas device 9 is connected to the clean gas main pipe 4 through a pipeline. The exhaust gas preheating and clean gas device 9 is connected to the preheater 10 and the hot air furnace 11 in sequence through pipelines.

[0029] The invention discloses a production method of a device for raising the temperature of blast furnace gas by using waste gas from a hot blast furnace. The raw gas produced by the blast furnace is transported to a dust collector 2 through a blast furnace top 1 for raw dust removal to become semi-clean gas. The semi-clean gas enters a dry dust removal system 3 for fine dust removal and then discharges high-pressure clean gas. The waste gas produced by the combustion of a hot blast furnace 11 first enters a preheater 10 to preheat the gas required for production. After preheating, the hot blast furnace waste gas discharged from the preheater 10 at a temperature of ≥180°C enters a waste gas preheating clean gas device 9. The high-pressure clean gas drawn from the clean gas main pipe 4 is heated to 150-160°C through heat exchange. The heated high-pressure clean gas enters a gas heating mixing tank 7 and is mixed with the semi-clean gas and then enters the dry dust removal system 3 together. The high-pressure clean gas of the clean gas main pipe 4 enters a TRT generator set 5. When the TRT generator set 5 fails, the high-pressure clean gas enters a gas pipe network 6 after pressure regulation by a pressure regulating valve group 12.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and basic spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for increasing the temperature of blast furnace gas by using hot blast furnace exhaust gas, characterized in that: It includes a blast furnace top, a dust collector, and a dry dust removal system which are connected in sequence. The clean gas main at the outlet of the dry dust removal system is respectively connected to the TRT generator and the clean gas pipeline network. A gas heating mixing tank is added to the inlet pipeline of the dry dust removal system. The gas heating mixing tank is connected to the exhaust gas preheating clean gas device through a preheating clean gas pipeline. The exhaust gas preheating clean gas device is connected to the clean gas main through a pipeline. The exhaust gas preheating clean gas device is connected to the preheater and the hot blast furnace in sequence through pipelines.

2. The device for increasing the temperature of blast furnace gas by using hot blast furnace exhaust gas according to claim 1, characterized in that: The dust collector is a gravity dust collector or a cyclone dust collector.

3. The device for increasing the temperature of blast furnace gas by using hot blast furnace exhaust gas according to claim 1, characterized in that: A pressure regulating valve group is arranged at the front end of the clean gas pipeline network.

4. A method for producing a device for raising the temperature of blast furnace gas by using the hot blast stove exhaust gas according to claim 1, characterized in that: The raw coal gas produced by blast furnace production is transported to the dust collector through the top of the blast furnace for raw dust removal to become semi-clean coal gas. The semi-clean coal gas enters the dry dust removal system for fine dust removal and then discharges high-pressure clean coal gas. The exhaust gas produced by the hot blast furnace combustion first enters the preheater to preheat the gas required for production. After preheating, the hot blast furnace exhaust gas discharged by the preheater at ≥180℃ enters the exhaust gas preheating clean coal gas device. The high-pressure clean coal gas drawn from the clean coal gas main is heated to above 150℃ through heat exchange. The heated high-pressure clean coal gas enters the gas heating mixing tank and is mixed with the semi-clean coal gas and then enters the dry dust removal system together. The high-pressure clean coal gas from the clean coal gas main enters the TRT generator set or gas pipeline network according to the process.

5. The method for producing the device for raising the temperature of blast furnace gas by using hot blast stove exhaust gas according to claim 4, characterized in that: The inlet gas temperature of the dry dust removal system is required to be between 120 and 220°C.

6. The method for producing the device for raising the temperature of blast furnace gas by using hot blast stove exhaust gas according to claim 4, characterized in that: The clean gas of the clean gas main pipe enters the gas network after being generated by TRT or pressure-regulated by a pressure-regulating valve group.

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