A blast furnace gas enrichment heating device, forming method and heating method

Abstract

The present invention discloses a blast furnace gas enrichment heating device, a molding method and a heating method, which belong to the field of coke oven heating technology, and includes a coke oven gas main pipe; it is characterized in that it also includes: a machine side blast furnace gas main pipe connected to the coke oven gas main pipe through a machine side enrichment pipe; a coke side blast furnace gas main pipe connected to the coke oven gas main pipe through a coke side enrichment pipe; wherein: an organic side mixer is arranged between the machine side enrichment pipe and the machine side blast furnace gas main pipe; a coke side mixer is arranged between the coke side enrichment pipe and the coke side blast furnace gas main pipe; an organic side electric adjustment mechanism, a machine side flow meter and a machine side valve are installed on the machine side enrichment pipe; a coke side electric adjustment mechanism, a coke side flow meter and a coke side valve are installed on the coke side enrichment pipe. The present invention can effectively reduce the top space temperature of the carbonization chamber, improve the quality and output of carbonization products, improve the quality of coke, protect the coke oven body structure, etc.

Description

Technical Field

[0001] The invention belongs to the technical field of coke oven heating, and in particular relates to a blast furnace gas enrichment heating device, a molding method and a heating method. Background Art

[0002] When the coke oven is heated by blast furnace gas, affected by the heating characteristics of blast furnace gas, the inert gas in the blast furnace gas accounts for more than 60%, the calorific value is low, the combustion speed is slow, and the combustion flame in the vertical fire channel of the combustion chamber is longer, resulting in a higher temperature in the upper part of the carbonization chamber. This situation will cause the three previous unfavorable situations.

[0003] ⑴ It causes the temperature of the furnace top space to be too high, seriously damaging the furnace top iron parts, increasing the heat dissipation on the furnace top surface, increasing the heat consumption of coking, and worsening the operating environment.

[0004] (2) It accelerates the cracking of raw gas in the carbonization chamber, seriously affects the composition of raw gas, and directly affects the yield and quality of recovered chemical products. The temperature of the top space of the carbonization chamber has a great influence on the yield and composition of chemical products. When the temperature is too high, the yield of tar and crude benzene is reduced due to pyrolysis.

[0005] ⑶ The temperature of the upper part of the coke cake in the carbonization chamber is high, while the temperature of the lower part, especially about 1 meter away from the coke side, is low. That is, the upper part of the coke cake is cooked first, and the lower part is cooked later, which affects the quality of the coke.

[0006] (4) It is also easy to form graphite in the furnace top space, causing the coke pushing current to be too high, making coke pushing difficult.

[0007] In view of the problem that the temperature of the furnace top space is too high when using blast furnace gas for heating, the present invention develops a blast furnace gas enrichment heating technology to solve the above problems. Summary of the invention

[0008] In view of the above technical defects, the present invention provides a blast furnace gas enrichment heating device, a molding method and a heating method, which can effectively reduce the top space temperature of the carbonization chamber, improve the quality and output of carbonization products, improve the quality of coke, and protect the coke oven body structure.

[0009] In order to achieve the above technical objectives, the present invention is implemented through the following technical solutions:

[0010] The first object of the present invention is to provide a blast furnace gas enrichment heating device, comprising:

[0011] coke oven gas main;

[0012] The machine-side blast furnace gas main connected to the coke oven gas main through the machine-side enrichment pipeline;

[0013] The coke side blast furnace gas main pipe is connected to the coke oven gas main pipe through the coke side enrichment pipeline; among which:

[0014] An organic side mixer is arranged between the machine side enrichment pipeline and the machine side blast furnace gas main pipeline; a coke side mixer is arranged between the coke side enrichment pipeline and the coke side blast furnace gas main pipeline; an organic side electric regulating mechanism, a machine side flow meter and a machine side valve are installed on the machine side enrichment pipeline; a coke side electric regulating mechanism, a coke side flow meter and a coke side valve are installed on the coke side enrichment pipeline.

[0015] Preferably: it also includes a controller, and the controller is respectively connected to the machine side flow meter, the coke side flow meter, the machine side valve, and the coke side valve.

[0016] The second object of the present invention is to provide a molding method of a blast furnace gas enrichment heating device, comprising:

[0017] S1. Install the machine-side enrichment pipeline and the coke-side enrichment pipeline at the gas inlet of the coke oven gas main;

[0018] S2. Install the machine-side blast furnace gas main pipe on the machine-side enrichment pipeline, and install the coke-side blast furnace gas main pipe on the coke-side enrichment pipeline;

[0019] S3, installing a machine-side electric regulating mechanism, a machine-side flow meter and a machine-side valve on the machine-side enrichment pipeline; installing a coke-side electric regulating mechanism, a coke-side flow meter and a coke-side valve on the coke-side enrichment pipeline;

[0020] S4. Connect the controller to the machine side flow meter, the coke side flow meter, the coke side electric adjustment mechanism and the machine side electric adjustment mechanism respectively.

[0021] The third object of the present invention is to provide a blast furnace gas enrichment heating method, comprising:

[0022] Step 1: Calculate the coke oven gas blending ratio according to the required furnace flame height;

[0023] Step 2: According to the coke oven gas blending ratio, the opening size of the computer side valve and the coke side valve;

[0024] Step 3: According to the measurement data of the machine side flow meter and the focus side flow meter, adjust the opening size of the focus side electric adjustment mechanism and the machine side electric adjustment mechanism.

[0025] Preferably, the blending ratio of coke oven gas shall not exceed 6%.

[0026] Preferably, the coke oven gas blending ratio is 3% to 5%.

[0027] The advantages and technical effects of the present invention are:

[0028] ⑴ High degree of automation: Both the gas enrichment main pipeline and the coke oven gas main pipeline are equipped with automatic adjustment actuators, which realize automatic adjustment well.

[0029] (2) High metering accuracy: High-precision ultrasonic flow meters are installed between the two valves of the gas enrichment and heating pipes on both sides of the coke oven, providing a basis for ensuring the coke oven gas blending ratio.

[0030] ⑶ It can effectively prevent the phenomenon of blast furnace gas backflow at the moment of switching: gas enrichment heating adopts pressure regulation. At the moment of switching, the pressure in the coke oven gas pipeline increases sharply. In order to ensure its pressure setting value, the regulating mechanism will instruct the actuator to close the valve, thereby preventing the phenomenon of blast furnace gas backflow at the moment of switching.

[0031] (4) Convenient maintenance: add a valve at the beginning and end of the gas enrichment and heating pipes on both sides of the coke oven machine (before the coke oven gas enters the gas mixer) to ensure that maintenance does not affect production.

[0032] After implementing this enrichment heating technology for coke oven blast furnace gas heating, great results have been achieved. The temperature of the furnace top space has been reduced by about 40℃ year-on-year, which has increased the output and quality of chemical products; improved the uniformity of furnace temperature, ensured the uniform maturity of coke cakes, and improved the quality of coke; reduced the heat dissipation on the furnace top surface, the growth rate of graphite in the furnace top space, effectively reduced the coke pushing current, protected the furnace structure, and improved the furnace top operating environment; created considerable economic and social benefits.

[0033] The implementation of blast furnace gas enrichment and heating technology can effectively reduce the temperature of the furnace top space, increase the output and recovery rate of chemical products, reduce the heat dissipation on the furnace top surface, slow down the growth rate of graphite in the furnace top space, improve the quality of coke, and protect the furnace structure.

[0034] With certain economic and social benefits, this technology is worthy of reference and promotion in the same industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural diagram of a preferred embodiment of the present invention.

[0036] Among them: 1. Blast furnace gas main on the machine side; 2. Coke oven gas main; 3. Blast furnace gas main on the coke side; 4. Mixer on the machine side; 5. Mixer on the coke side; 6. Electric adjustment mechanism on the coke side; 7. Electric adjustment mechanism on the machine side; 8. Flow meter on the machine side; 9. Flow meter on the coke side; 10. Valve on the machine side; 11. Valve on the coke side; 12. Enrichment pipeline on the machine side; 13. Enrichment pipeline on the coke side. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned purpose, control system and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0038] See also Figure 1 , adopting the blast furnace gas "enrichment" principle, the blast furnace gas enrichment heating technology is implemented on the coke oven, thereby fundamentally solving the practical problem of high temperature in the coke oven top space when using blast furnace gas for heating.

[0039] Principle of blast furnace gas enrichment heating technology: Blast furnace gas enrichment heating technology is to add a certain proportion of high calorific value coke oven gas (rich gas) into the low calorific value blast furnace gas (lean gas) used for heating, and implement the mixing and heating of the two gases.

[0040] The characteristics of post-enrichment heating are: since blast furnace gas has a low calorific value and a long combustion flame, enrichment can effectively increase the calorific value of blast furnace gas and reduce the height of the gas combustion flame in the vertical fire channel of the combustion chamber, thereby achieving the purpose of reducing the temperature of the furnace top space.

[0041] A blast furnace gas enrichment and heating device, comprising:

[0042] Coke oven gas main 2;

[0043] A machine-side blast furnace gas main 1 connected to a coke oven gas main 2 via a machine-side enrichment pipeline 12;

[0044] The coke side blast furnace gas main 3 is connected to the coke oven gas main 2 through the coke side enrichment pipeline 13; wherein:

[0045] An organic side mixer 4 is arranged between the machine side enrichment pipeline 12 and the machine side blast furnace gas main 1; a coke side mixer 5 is arranged between the coke side enrichment pipeline 13 and the coke side blast furnace gas main 3; an organic side electric regulating mechanism 7, a machine side flow meter 8 and a machine side valve 10 are installed on the machine side enrichment pipeline 12; and a coke side electric regulating mechanism 6, a coke side flow meter 9 and a coke side valve 11 are installed on the coke side enrichment pipeline 13.

[0046] It also includes a controller, which is connected to the machine side flow meter 8, the coke side flow meter 9, the coke side electric adjustment mechanism 6 and the machine side electric adjustment mechanism 7 respectively.

[0047] A molding method of a blast furnace gas enrichment heating device, comprising:

[0048] S1, installing the machine-side enrichment pipeline 12 and the coke-side enrichment pipeline 13 at the gas inlet of the coke oven gas main 2;

[0049] S2, installing the machine-side blast furnace gas main pipe 1 on the machine-side enrichment pipe 12, and installing the coke-side blast furnace gas main pipe 3 on the coke-side enrichment pipe 13;

[0050] S3, installing a machine-side electric regulating mechanism 7, a machine-side flowmeter 8 and a machine-side valve 10 on the machine-side enrichment pipeline 12; installing a coke-side electric regulating mechanism 6, a coke-side flowmeter 9 and a coke-side valve 11 on the coke-side enrichment pipeline 13;

[0051] S4. Connect the controller to the machine side flow meter 8, the coke side flow meter 9, the machine side valve 10, and the coke side valve 11 respectively.

[0052] A blast furnace gas enrichment and heating method, comprising:

[0053] Step 1: Calculate the coke oven gas blending ratio according to the required furnace flame height;

[0054] Step 2: According to the coke oven gas blending ratio, the opening sizes of the computer side valve 10 and the coke side valve 11 are adjusted;

[0055] Step 3: According to the measurement data of the machine side flow meter 8 and the focus side flow meter 9, the opening sizes of the focus side electric adjustment mechanism 6 and the machine side electric adjustment mechanism 7 are adjusted.

[0056] The proportion of coke oven gas blended with coal shall not exceed 6%.

[0057] The coke oven gas blending ratio is 3% to 5%.

[0058] The assembly process of the present invention comprises:

[0059] Connect the machine-side blast furnace gas main 1 and the coke-side blast furnace gas main 3 to the coke oven gas main 2 through the machine-side mixer 4 and the coke-side mixer 5 respectively;

[0060] All blast furnace gas enrichment heating pipelines are laid with DN200 plain carbon steel pipes, and the pipelines should be resistant to acidic chemical corrosion and electrochemical corrosion.

[0061] The machine side enrichment pipeline 12 and the coke side enrichment pipeline 13 are installed on the original coke oven gas main 2 in the coke oven basement. The machine side enrichment pipeline 12 and the coke side enrichment pipeline 13 are connected to the organic side mixer 4 and the coke side mixer 5 respectively.

[0062] A machine side valve 10 and a coke side valve 11 are added at the beginning and end (before the coke oven gas enters the gas mixer) of the gas enrichment and heating branch pipes on both sides of the machine and coke, respectively, in order to facilitate inspection and maintenance.

[0063] Between the two valves of the gas enrichment and heating pipes on both sides of the machine-coke, a high-precision ultrasonic flowmeter, a machine-side flowmeter 8, a coke-side flowmeter 9, a coke-side electric regulating mechanism 6, and a machine-side electric regulating mechanism 7 are installed respectively.

[0064] Determination of technical parameters for blast furnace gas enrichment heating. The key point of this technology is the blending ratio. Usually the blending ratio of coke oven gas is 3-5%, and the maximum should not exceed 6%. The blending ratio must be strictly controlled.

[0065] The coke oven gas pressure on both sides of the mechanical coke of the gas enrichment heating branch should be maintained 200Pa higher than the corresponding blast furnace gas pressure.

[0066] Activate the automatic regulating mechanism of coke oven gas to preliminarily control the pressure of gas enrichment and heating.

[0067] Pressure regulation is used in blast furnace gas enrichment heating to prevent blast furnace gas backflow at the moment of reversal.

[0068] In daily operations, when coke oven gas and blast furnace gas are mixed for heating and combustion, it is imperative to strictly follow the prescribed blending ratio and not increase the ratio at will.

[0069] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A blast furnace gas enrichment and heating device, comprising a coke oven gas main pipe (2); characterized in that: Blast furnace gas enrichment heating is to add a certain proportion of high calorific value coke oven gas into the low calorific value blast furnace gas used for heating, and the two gases are mixed and heated; the device also includes: A machine-side blast furnace gas main pipe (1) connected to a coke oven gas main pipe (2) via a machine-side enrichment pipe (12); A coke side blast furnace gas main pipe (3) connected to the coke oven gas main pipe (2) through a coke side enrichment pipe (13); wherein: An organic side mixer (4) is arranged between the machine side enrichment pipeline (12) and the machine side blast furnace gas main pipe (1); a coke side mixer (5) is arranged between the coke side enrichment pipeline (13) and the coke side blast furnace gas main pipe (3); an organic side electric regulating mechanism (7), a machine side flow meter (8) and a machine side valve (10) are installed on the machine side enrichment pipeline (12); and a coke side electric regulating mechanism (6), a coke side flow meter (9) and a coke side valve (11) are installed on the coke side enrichment pipeline (13); The heating method of the device comprises: Step 1: Calculate the coke oven gas blending ratio according to the required furnace flame height, wherein the coke oven gas blending ratio is 3% to 5%; Step 2: According to the coke oven gas blending ratio, the opening sizes of the computer side valve (10) and the coke side valve (11) are calculated; Step 3: According to the measurement data of the machine side flow meter (8) and the coke side flow meter (9), the opening sizes of the coke side electric regulating mechanism (6) and the machine side electric regulating mechanism (7) are adjusted; at the moment of switching, the pressure in the coke oven gas pipeline increases sharply. In order to ensure its pressure setting value, the actuator is instructed to close the valve to prevent the blast furnace gas from flowing back at the moment of switching.

2. The blast furnace gas enrichment heating device according to claim 1, characterized in that: It also includes a controller, which is respectively connected to the machine-side flow meter (8), the coke-side flow meter (9), the machine-side valve (10), and the coke-side valve (11).

3. A molding method for a blast furnace gas enrichment heating device, characterized in that: For obtaining the blast furnace gas enrichment heating device according to claim 1 or 2, the molding method comprises: S1, installing a machine-side enrichment pipeline (12) and a coke-side enrichment pipeline (13) at the gas inlet of the coke oven gas main (2); S2, installing the machine-side blast furnace gas main pipe (1) on the machine-side enrichment pipe (12), and installing the coke-side blast furnace gas main pipe (3) on the coke-side enrichment pipe (13); S3, installing a machine-side electric adjustment mechanism (7), a machine-side flow meter (8), and a machine-side valve (10) on the machine-side enrichment pipeline (12); installing a coke-side electric adjustment mechanism (6), a coke-side flow meter (9), and a coke-side valve (11) on the coke-side enrichment pipeline (13); S4, connecting the controller to the machine side flow meter (8), the coke side flow meter (9), the coke side electric adjustment mechanism (6), and the machine side electric adjustment mechanism (7) respectively.

Images