Method for reducing unit gas consumption of desulfurization and denitrification hot-blast stove

Abstract

The invention discloses a method for reducing unit gas consumption of a desulfurization and denitrification hot-blast stove. The method for reducing unit gas consumption of the desulfurization and denitrification hot-blast stove comprises the step that cooling air discharged from a cooling air outlet of a regeneration tower replaces normal-temperature air of combustion-supporting air of the hot-blast stove and is conveyed into the hot-blast stove to be mixed with gas for combustion. According to the method for reducing the unit gas consumption of the desulfurization and denitrification hot-blast stove, heat required by the temperature rise of original combustion-supporting air can be saved, the use amount of coke oven gas is reduced, meanwhile, the electricity consumption of operation of a combustion-supporting fan is reduced, and energy conservation, consumption reduction, cost reduction and efficiency improvement are achieved.

Description

Technical Field

[0001] The invention relates to a method for reducing the unit consumption of coal gas in a desulfurization and denitration hot blast furnace. Background Art

[0002] Dry activated carbon desulfurization and denitrification technology has been widely used in large steel mills and power plants. During the production and operation of the activated carbon activation and regeneration device, the cooling fan cools down the activated high-temperature activated carbon and exchanges heat to reduce the temperature of the activated carbon to the process requirements. After the cooling air temperature rises from room temperature (about 30°C) to 200-220°C, it is discharged into the air through the cooling air outlet of the regeneration tower. In this process, the high-temperature cooling air carries huge heat energy but is not utilized, resulting in a waste of heat energy. At the same time, the heat required in the production process of the activated carbon activation and regeneration device is provided by the hot blast furnace burning coal gas. The combustion air temperature provided by the combustion-supporting fan is room temperature (about 30°C). It is mixed with the high-temperature coal gas transported by the gas pipeline with heating to reach the required air-fuel ratio and then burned to provide heat for the regeneration tower. The temperature of the coal gas will decrease during the mixing process of the low-temperature combustion-supporting air and the high-temperature coal gas. Therefore, the heat required for the hot blast furnace to reach the required temperature for the analysis temperature of the regeneration tower will increase, resulting in an increase in coal gas consumption and a waste of coal gas energy. Summary of the invention

[0003] The purpose of the present invention is to provide a method for reducing the unit gas consumption of a desulfurization and denitrification hot blast furnace. The method for reducing the unit gas consumption of a desulfurization and denitrification hot blast furnace can save the heat required for heating the original combustion-supporting air, reduce the use of coke oven gas, and also reduce the power consumption of the combustion-supporting fan, thereby achieving energy saving, consumption reduction, cost reduction and efficiency improvement.

[0004] In order to achieve the above-mentioned purpose, the present invention provides a method for reducing the unit gas consumption of a desulfurization and denitrification hot blast furnace. The method for reducing the unit gas consumption of a desulfurization and denitrification hot blast furnace comprises replacing the normal temperature air of the hot blast furnace combustion-supporting air with the cooling air discharged from the cooling air outlet of the regeneration tower, and delivering it to the hot blast furnace to mix with the coal gas for combustion.

[0005] Preferably, the temperature of the cooling air discharged from the cooling air outlet of the regeneration tower is 170-250°C.

[0006] Preferably, the temperature of the normal temperature air of the hot blast stove combustion air is 10-40°C.

[0007] Preferably, a pipeline is used to connect the cooling air outlet of the regeneration tower with the inlet of the combustion-supporting fan and to the hot air stove, so as to increase the temperature of the normal temperature air of the combustion-supporting fan and then transport it to the hot air stove.

[0008] Preferably, the normal temperature air of the combustion-supporting blower is raised from 30° C. to 150° C. before entering the hot air furnace.

[0009] Preferably, a closed square tube is formed at the connection between the pipeline and the cooling air outlet of the regeneration tower.

[0010] Preferably, a closed square tube is formed at the connection between the pipeline and the hot blast stove.

[0011] Preferably, the combustion-supporting blower is connected to a middle point of a pipe connecting the cooling air outlets of the regeneration tower through a pipe.

[0012] Preferably, there are two combustion-supporting fans connected in parallel.

[0013] Preferably, the combustion-supporting air flow rate formed by the combustion-supporting fan is 3000m 3 / h-8000m 3 / h.

[0014] According to the above technical scheme, the present invention utilizes the cooling air discharged from the cooling air outlet of the regeneration tower to replace the normal temperature air of the hot blast furnace combustion-supporting air and transports it to the hot blast furnace to be mixed with coal gas for combustion, thereby eliminating the heat required for heating the original combustion-supporting air, reducing the use of coke oven gas, and also reducing the power consumption of the combustion-supporting fan, thereby achieving the purpose of energy saving, consumption reduction, cost reduction and efficiency improvement.

[0015] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 It is a schematic diagram of pipeline connection in the method for reducing the unit consumption of coal gas in a desulfurization and denitration hot blast furnace provided by the present invention.

[0018] Description of Reference Numerals

[0019] 1- Regeneration tower cooling air outlet 2- Pipeline

[0020] 3- Combustion-supporting fan 4- Square tube with closed end DETAILED DESCRIPTION

[0021] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0022] In the present invention, unless otherwise stated, directional words such as "inside" and "outside" contained in a term merely represent the orientation of the term in normal use, or are common names understood by those skilled in the art, and should not be regarded as limitations on the term.

[0023] See also Figure 1The present invention provides a method for reducing the unit gas consumption of a desulfurization and denitrification hot blast furnace. The method for reducing the unit gas consumption of a desulfurization and denitrification hot blast furnace includes replacing the normal temperature air of the hot blast furnace combustion-supporting air with the cooling air discharged from the cooling air outlet 1 of the regeneration tower, and delivering the cooling air to the hot blast furnace to mix with the coal gas for combustion.

[0024] The temperature of the cooling air discharged from the cooling air outlet 1 of the regeneration tower is 170-250°C, and the temperature of the normal temperature air of the hot blast furnace combustion air is 10-40°C.

[0025] In this embodiment, in order to facilitate the transportation of hot air, maintain the air volume and maintain the sealing during the hot air transportation process, preferably, a pipeline 2 is used to connect the cooling air outlet 1 of the regeneration tower with the inlet of the combustion-supporting fan 3 and connect it to the hot air furnace, so as to increase the room temperature of the combustion-supporting fan 3 and then transport it to the hot air furnace.

[0026] Through the above-mentioned pipeline connection and the delivery of the combustion-supporting fan 3, the room temperature air of the combustion-supporting fan 3 is increased from 30°C to 150°C before entering the hot blast furnace, meeting the requirement of mixed combustion with coal gas in the hot blast furnace.

[0027] In this embodiment, in order to improve the sealing of the pipeline 2 after connection to prevent the loss of hot air and heat, and to ensure the stability of the pipeline 2 after connection to avoid the connection from falling off, a closing square tube 4 is preferably formed at the connection between the pipeline 2 and the regeneration tower cooling air outlet 1.

[0028] Similarly, in order to improve the sealing and stability of the pipeline 2 after connection, preferably, a closing pipe is formed at the connection between the pipeline 2 and the hot air furnace.

[0029] In this embodiment, in order to enable the combustion-supporting fan 3 to obtain a stable air flow rate between the cooling air outlets 1 of the regeneration tower, and obtain a uniform amount of hot air from the cooling air outlets on both sides of the regeneration tower, thereby making the heat of the hot air in the pipeline 2 more uniform, preferably, the combustion-supporting fan 3 is connected to the middle point of the pipeline 2 between the cooling air outlets 1 of the regeneration tower through the pipeline 2.

[0030] In addition, in order to ensure that the combustion-supporting fan 3 can work stably, it is preferred that there are two combustion-supporting fans 3 connected in parallel. In this way, during actual operation, one or both fans can be turned on at the same time as needed, and the technical effect of "one in use and one in reserve" can be achieved.

[0031] After the combustion-supporting air fan 3 forms the combustion-supporting air, in order to prevent the combustion-supporting air flow from being too large or too small, resulting in poor temperature increase, the combustion-supporting air flow formed by the combustion-supporting air fan 3 is preferably 3000m 3 / h-8000m 3 / h.

[0032] The following is a specific implementation method for illustrating the method for reducing the unit gas consumption of a desulfurization and denitration hot blast furnace provided by the present invention:

[0033] The main process parameters of production and processing include:

[0034] Gas type: coke oven gas;

[0035] Gas calorific value: 4200kcal / m 3 ;

[0036] Gas pressure: 4kPa;

[0037] Combustion air flow: 5000m 3 / h;

[0038] Original combustion air temperature: 30℃;

[0039] Combustion air temperature after technical transformation: 150℃ (loss from cooling air outlet to combustion air inlet);

[0040] Combustion-supporting fan model: YPT3-200L2-2;

[0041] Voltage: 380V;

[0042] Rated current: 68.2A;

[0043] Rated power: 37KW;

[0044] After implementing the above scheme to reduce the unit gas consumption of desulfurization and denitration hot blast furnace, the energy saving effect is as follows:

[0045] The combustion air temperature is increased from 30℃ to 150℃, and the combustion air flow rate L is 5000m 3 / h, air specific heat capacity: C = 1.0 kj / (kg·℃), air molar mass is 0.029 kg / mol, and the volume of each mole of gas under standard conditions is 0.0224 m 3 / mol, the calorific value of coal gas is 4200kcal / m 3 , where 1kcal = 4.19kj; then:

[0046] The amount of gas saved by the hot blast furnace if it is put into operation 320 days per year is as follows:

[0047] The heat required to raise the temperature of combustion air from 30℃ to 150℃ in one year Q1:

[0048] Q1=1.0kj / (kg·℃)×(5000m 3 / h×24h×320)÷0.0224m 3 / mol×0.029kg / mol

[0049] ×(150℃-30℃)=5965714285kj;

[0050] The amount of gas saved by raising the temperature of combustion air from 30℃ to 150℃ V1:

[0051] V1=Q1÷4.19÷4200kcal / m 3

[0052] =1kj÷4.19kcal×5965714285kj÷4200kcal / m 3

[0053] =338999m 3 ;

[0054] It can be seen that this method utilizes the cooling air discharged from the cooling air outlet of the regeneration tower to replace the normal temperature air of the hot blast furnace combustion air and transports it to the hot blast furnace to mix with the coal gas for combustion, thereby eliminating the heat required for heating the original combustion air, reducing the use of coke oven gas, and also reducing the power consumption of the combustion fan, thereby achieving the purpose of energy saving, consumption reduction, cost reduction and efficiency improvement.

[0055] 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, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0056] 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.

[0057] In addition, various embodiments of the present invention may be arbitrarily combined, and 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.

Claims

1. A method for reducing the unit gas consumption of a desulfurization and denitration hot blast furnace, It is characterized in that The method for reducing the unit gas consumption of a desulfurization and denitration hot blast furnace comprises replacing the normal temperature air of the hot blast furnace combustion-supporting air with the cooling air discharged from the cooling air outlet (1) of the regeneration tower, and delivering the cooling air to the hot blast furnace to mix with the coal gas for combustion.

2. The method for reducing the unit gas consumption of a desulfurization and denitration hot blast furnace according to claim 1, It is characterized in that The temperature of the cooling air discharged from the cooling air outlet (1) of the regeneration tower is 170-250°C.

3. The method for reducing the unit gas consumption of a desulfurization and denitration hot blast furnace according to claim 2, It is characterized in that The temperature of the normal temperature air of the hot blast furnace combustion-supporting air is 10-40°C.

4. The method for reducing the unit gas consumption of a desulfurization and denitration hot blast furnace according to claim 3, It is characterized in that The cooling air outlet (1) of the regeneration tower is connected to the inlet of the combustion-supporting fan (3) and connected to the hot air furnace by using a pipeline (2), so as to increase the temperature of the normal temperature air of the combustion-supporting fan (3) and then transport it to the hot air furnace.

5. The method for reducing the unit gas consumption of a desulfurization and denitration hot blast furnace according to claim 4, It is characterized in that The normal temperature air of the combustion-supporting blower (3) is raised from 30° C. to 150° C. before entering the hot air furnace.

6. The method for reducing the unit gas consumption of a desulfurization and denitration hot blast furnace according to claim 5, It is characterized in that A closed square tube (4) is formed at the connection between the pipeline (2) and the regeneration tower cooling air outlet (1).

7. The method for reducing the unit gas consumption of a desulfurization and denitration hot blast furnace according to claim 6, It is characterized in that A closing pipe is formed at the connection between the pipeline (2) and the hot air furnace.

8. The method for reducing the unit gas consumption of a desulfurization and denitration hot blast furnace according to claim 7, It is characterized in that The combustion-supporting fan (3) is connected to the middle point of the pipeline (2) communicating with the cooling air outlet (1) of the regeneration tower through the pipeline (2).

9. The method for reducing the unit gas consumption of a desulfurization and denitration hot blast furnace according to any one of claims 4 to 8, It is characterized in that There are two combustion-supporting fans (3) connected in parallel.

10. The method for reducing the unit gas consumption of a desulfurization and denitration hot blast furnace according to claim 9, It is characterized in that The combustion-supporting air flow rate formed by the combustion-supporting air fan (3) is 3000m 3 / h-8000m 3 / h.

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