Hot blast stove capable of using coke oven and blast furnace gas

Abstract

The utility model provides a hot blast stove capable of using coke oven and blast furnace gas, and relates to the technical field of hot blast stoves. The hot blast stove comprises a combustion chamber, a bottom inlet of the combustion chamber is connected with a combustor, a top outlet of the combustion chamber is connected with a smoke pipeline, a cold air distribution fan is arranged outside the combustion chamber and communicated with the interior of the combustion chamber through an air distribution pipeline, and an igniter used for igniting internal gas is arranged in the combustion chamber. The blast furnace gas pipeline, the coke oven gas pipeline and the combustion-supporting pipeline are respectively communicated with an inlet of the combustor; and one end of the combustion-supporting pipeline is connected with a combustion-supporting fan. According to the hot blast stove, blast furnace gas and coke oven gas which are generated in the ironmaking process can be mixed with air respectively, the same combustion chamber is utilized for combustion, the mixture is converted into available hot air, space is saved, the hot blast stove is more economical, and meanwhile high-temperature flue gas generated by the hot blast stove can be more conveniently and intensively utilized.

Description

Technical Field

[0001] The utility model relates to the technical field of hot blast stoves, in particular to a hot blast stove that can use coke oven gas and blast furnace gas. Background Art

[0002] During the production process of steel mills, two harmful gases, blast furnace gas and coke oven gas, will be generated. Among them, blast furnace gas is a by-product of the blast furnace ironmaking process. Blast furnace gas is a colorless and odorless combustible gas, with a combustion temperature of 1400 - 1500 °C, an ignition temperature of about 700 °C, and a calorific value of about 700 - 800 kcal. The blast furnace gas contains CO, which is a toxic and harmful gas; Coke oven gas is mainly a by-product generated by coal in the coke oven. The main components are carbon monoxide and carbon dioxide, with a calorific value of 1500 - 1800 kcal, and is generally used for steelmaking and as a fuel.

[0003] The direct emission of blast furnace gas and coke oven gas will pollute the air and needs to be treated. Currently, generally, a hot blast stove is used to burn them for heat supply, and then desulfurization and denitrification treatment are carried out. A hot blast stove is a thermal machine and a thermal equipment that provides hot air flow for other processes. The hot blast stove adopts the form of direct fuel combustion to generate hot air to directly heat the target or heat the air through a heat accumulator and then use the air to heat the target.

[0004] The current hot blast stoves cannot simultaneously meet the treatment requirements of blast furnace gas and coke oven gas, the by-products of blast furnace ironmaking in steel mills, and the utilization efficiency of blast furnace gas and coke oven gas is relatively low.

[0005] In view of the above reasons, the utility model provides a hot blast stove that can use coke oven gas and blast furnace gas to solve the above technical problems. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a hot blast stove that can use coke oven gas and blast furnace gas. This hot blast stove can mix two harmful gases, blast furnace gas and coke oven gas generated during the ironmaking process, with air respectively, and use the same combustion chamber for combustion, converting them into utilizable hot air, saving space and being more economical. At the same time, it makes the high-temperature flue gas generated by the hot blast stove more convenient for centralized utilization.

[0007] The utility model provides a hot blast stove that can use coke oven gas and blast furnace gas, including: a combustion chamber, the bottom inlet of the combustion chamber is connected with a burner, the top outlet of the combustion chamber is connected with a flue gas pipeline, a cold air supply fan is arranged outside the combustion chamber, the cold air supply fan is connected with the inside of the combustion chamber through an air distribution pipeline, and an igniter for igniting the internal gas is arranged inside the combustion chamber; a blast furnace gas pipeline, a coke oven gas pipeline, and a combustion-supporting pipeline are respectively connected to the inlet of the burner, and one end of the combustion-supporting pipeline is connected with a combustion-supporting fan.

[0008] Preferably, a blast furnace gas flowmeter and a blast furnace gas regulating valve are provided on the blast furnace gas pipeline.

[0009] Preferably, a coke oven gas flowmeter and a coke oven gas regulating valve are provided on the coke oven gas pipeline.

[0010] Preferably, the combustion air blower is connected to an electric control module, and the electric control module can control the rotation speed of the combustion air blower.

[0011] Preferably, a first pressure transmitter and a first temperature transmitter are installed outside the burner.

[0012] Preferably, a flame detector is provided inside the combustion chamber.

[0013] Preferably, an outlet valve is indirectly connected between the top outlet of the combustion chamber and the flue gas pipeline.

[0014] Preferably, a second temperature transmitter is installed outside the combustion chamber.

[0015] Preferably, a second pressure transmitter is installed at the bottom of the combustion chamber.

[0016] Preferably, the electric control module is a PLC controller, and the PLC controller is used to control the opening and closing of each valve.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] 1. Through the burner, two harmful gases, namely blast furnace gas or coke oven gas generated during the ironmaking process, can be respectively mixed with air, and burned in the same combustion chamber, converted into utilizable hot air, saving space and being more economical. At the same time, the high-temperature flue gas generated by the hot blast stove is more convenient for centralized utilization;

[0019] 2. By controlling the rotation speed of the combustion air blower, the air volume entering the burner can be controlled to ensure that the air-fuel ratio entering the burner is the optimal air-fuel ratio, improving the combustion efficiency;

[0020] 3. By connecting the cold air blower and the air distribution pipeline to the inside of the combustion chamber, the air required for combustion can be provided to ensure the combustion efficiency. The high-temperature flue gas after combustion flows out through the flue gas pipeline for unified treatment, saving the treatment cost. Description of the Drawings

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is the front view schematic diagram of the overall structure of the hot blast stove of the present invention;

[0023] Figure 2 It is the side view schematic diagram of the overall structure of the hot blast stove of the present invention;

[0024] Figure 3 It is the top view schematic diagram of the combustion chamber of the hot blast stove in the present invention;

[0025] Figure 4 It is the bottom view schematic diagram of the burner in the present invention;

[0026] Explanation of reference numerals:

[0027] 1: Cold air supply fan; 2: Blast furnace gas flowmeter; 3: Blast furnace gas regulating valve; 4: Blast furnace gas pipeline; 5: Combustion-supporting fan; 6: Coke oven gas regulating valve; 7: Coke oven gas flowmeter; 8: Burner; 801: First pressure transmitter; 802: First temperature transmitter; 9: Coke oven gas pipeline; 10: Flue gas pipeline; 11: Outlet valve; 12: Air distribution pipeline; 13: Combustion chamber; 1301: Flame detector; 1302: Second temperature transmitter; 1303: Second pressure transmitter; 14: Combustion-supporting pipeline; 15: PLC controller. Specific embodiments

[0028] The following will clearly and completely describe the technical solutions of the present invention in combination with the embodiments. Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0029] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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. Therefore, it should not be construed as a limitation to the present utility model.

[0030] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present utility model, "a plurality of" means two or more unless otherwise specifically defined. In addition, the terms "mounted", "connected" and "coupled" shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] Such as Figures 1-4As shown in the figure, the utility model provides a hot blast stove that can use coke oven gas and blast furnace gas, including: a combustion chamber 13, the bottom inlet of the combustion chamber 13 is connected with a burner 8 communicated with its interior, the top outlet of the combustion chamber 13 is connected with a flue gas pipeline 10, an air distribution and cooling fan 1 is arranged outside the combustion chamber 13, and the air distribution and cooling fan 1 is communicated with the interior of the combustion chamber 13 through an air distribution pipeline 12. An igniter for igniting the internal gas is arranged inside the combustion chamber 13; a cross joint is arranged at the inlet of the burner 8, and a blast furnace gas pipeline 4, a coke oven gas pipeline 9 and a combustion-supporting pipeline 14 are respectively connected to the inlet of the burner 8, and one end of the combustion-supporting pipeline 14 is connected with a combustion-supporting fan 5. The by-product blast furnace gas generated by blast furnace ironmaking and the coke oven gas generated by the combustion of coal in the coke oven can be respectively introduced into the combustion chamber 13 through the blast furnace gas pipeline 4 and the coke oven gas pipeline 9. The air inhaled by the combustion-supporting fan 5 enters the combustion chamber 13 through the combustion-supporting pipeline 14 and is mixed with the blast furnace gas introduced through the blast furnace gas pipeline 4 or the coke oven gas introduced through the coke oven gas pipeline 9. The ratio of the above-mentioned mixed gas of blast furnace gas or coke oven gas and air can be adjusted to an optimal ratio, and then blown into the combustion chamber 13. The igniter conducts ignition work to ignite the mixed gas in the combustion chamber 13, generating high-temperature flue gas. The air enters the combustion chamber 13 through the air distribution pipeline 12 under the action of the air distribution and cooling fan 1, is mixed with the high-temperature flue gas and then discharged through the flue gas pipeline 10 for use as hot blast.

[0032] More specifically, a blast furnace gas flowmeter 2 and a blast furnace gas regulating valve 3 are arranged on the blast furnace gas pipeline 4. Among them, the blast furnace gas regulating valve 3 is used to control the on-off of the pipeline between the blast furnace gas pipeline 4 and the inlet of the burner 8, and the blast furnace gas flowmeter 2 is used to detect the flow rate of blast furnace gas. A coke oven gas flowmeter 7 and a coke oven gas regulating valve 6 are arranged on the coke oven gas pipeline 9. Among them, the coke oven gas regulating valve 6 is used to control the on-off of the pipeline between the coke oven gas pipeline 9 and the inlet of the burner 8, and the coke oven gas flowmeter 7 is used to detect the flow rate of coke oven gas. When blast furnace gas is discharged, the blast furnace gas regulating valve 3 is opened, and the coke oven gas regulating valve 6 is closed. The blast furnace gas enters the burner 8 and is mixed with the air blown into the burner 8 by the combustion-supporting fan 5. After mixing, it enters the combustion chamber 13. The igniter in the combustion chamber 13 conducts ignition work to ignite the mixed gas blown into the combustion chamber 13 by the burner 8 in the combustion chamber 13. The air sent by the air distribution and cooling fan 1 enters the combustion chamber 13 through the air distribution pipeline 12. The air is mixed with the high-temperature flue gas generated by combustion and discharged through the flue gas pipeline 10; when coke oven gas is discharged, the coke oven gas regulating valve 6 is opened, and the blast furnace gas regulating valve 3 is closed. The coke oven gas enters the burner 8 through the coke oven gas pipeline 9, is mixed with the air blown into the burner 8 by the combustion-supporting fan 5, and after mixing, enters the combustion chamber 13 to be ignited to generate high-temperature flue gas, which is mixed with the air sent by the air distribution and cooling fan 1 and discharged through the flue gas pipeline 10.

[0033] In this embodiment, both the combustion-supporting blower 5 and the cold air supply blower 1 are connected to the electronic control module. Specifically, the electronic control module uses a PLC controller 15. The PLC controller 15 can control the rotational speeds of the combustion-supporting blower 5 and the cold air supply blower 1 according to the flow data collected by the blast furnace gas flowmeter 2 and the coke oven gas flowmeter 7. By controlling the rotational speed of the combustion-supporting blower 5, the air volume entering the burner 8 can be controlled to ensure that the air-fuel ratio entering the burner 8 is the optimal air-fuel ratio. Moreover, the PLC controller 15 can control the opening and closing of each valve to achieve the switching of combustible gases.

[0034] In this embodiment, a first pressure transmitter 801 and a first temperature transmitter 802 are installed outside the burner 8, which are respectively used to detect the internal pressure and temperature of the burner 8 to ensure that they are within a reasonable range. The burner 8 has a purging function. By controlling the burner 8 to perform a purging operation, the residual blast furnace gas or coke oven gas in the burner 8 can be discharged.

[0035] A flame detector 1301 is arranged inside the combustion chamber 13, a second temperature transmitter 1302 is installed outside the combustion chamber 13, and a second pressure transmitter 1303 is installed at the bottom of the combustion chamber 13. The flame height can be detected by the flame detector 1301, and the temperature and pressure inside the combustion chamber 13 can be detected by the second temperature transmitter 1302 and the second pressure transmitter 1303. Then, the rotational speed of the cold air supply blower 1 can be controlled by the PLC controller 15 to adjust the air flow rate entering the combustion chamber 13, and further adjust its internal pressure and temperature.

[0036] In this embodiment, an outlet valve 11 is connected between the top outlet of the combustion chamber 13 and the flue gas pipe 10. The discharge of high-temperature flue gas can be controlled through the outlet valve 11.

[0037] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hot blast stove capable of using coke oven gas and blast furnace gas, characterized in that, Comprising: A combustion chamber, the bottom inlet of the combustion chamber is connected with a burner, the top outlet of the combustion chamber is connected with a flue gas pipeline, an air-cooling blower is arranged outside the combustion chamber, the air-cooling blower is communicated with the inside of the combustion chamber through an air distribution pipeline, and an igniter for igniting the internal gas is arranged inside the combustion chamber; a blast furnace gas pipeline, a coke oven gas pipeline and a combustion-supporting pipeline are respectively connected to the inlet of the burner, and one end of the combustion-supporting pipeline is connected with a combustion-supporting blower.

2. The hot blast stove capable of using coke oven gas and blast furnace gas according to claim 1, characterized in that, A blast furnace gas flowmeter and a blast furnace gas regulating valve are arranged on the blast furnace gas pipeline.

3. The hot blast stove capable of using coke oven gas and blast furnace gas according to claim 1, characterized in that, A coke oven gas flowmeter and a coke oven gas regulating valve are arranged on the coke oven gas pipeline.

4. The hot blast stove capable of using coke oven gas and blast furnace gas according to claim 1, characterized in that, The combustion-supporting blower is connected to an electric control module, and the electric control module can control the rotation speed of the combustion-supporting blower.

5. The hot blast stove capable of using coke oven gas and blast furnace gas according to claim 1, characterized in that, A first pressure transmitter and a first temperature transmitter are installed outside the burner.

6. The hot blast stove capable of using coke oven gas and blast furnace gas according to claim 1, characterized in that, A flame detector is arranged inside the combustion chamber.

7. The hot blast stove capable of using coke oven gas and blast furnace gas according to claim 1, characterized in that, An outlet valve is connected between the top outlet of the combustion chamber and the flue gas pipeline indirectly.

8. The hot blast stove capable of using coke oven gas and blast furnace gas according to claim 1, characterized in that, A second temperature transmitter is installed outside the combustion chamber.

9. The hot blast stove capable of using coke oven gas and blast furnace gas according to claim 1, wherein A second pressure transmitter is installed at the bottom of the combustion chamber.

10. The hot blast stove capable of using coke oven gas and blast furnace gas according to claim 4, characterized in that, The electric control module is a PLC controller, and the PLC controller is used for controlling the opening and closing of each valve.

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