Method for balancing and adjusting calorific value of hydrogen-rich carbon circulating oxygen blast furnace gas

Abstract

The invention belongs to the technical field of gas calorific value balance adjustment, and particularly discloses a hydrogen-carbon-rich circulating oxygen blast furnace gas calorific value balance adjustment device which comprises a flow regulator and a flow detector, a hydrogen-carbon-rich circulating oxygen blast furnace is communicated with a second gas pipe, and the second gas pipe is communicated with a second blast furnace. The flow regulator and the flow detector are both communicated with a gas pipe II, the gas pipe II is communicated with a gas chamber I and a gas pipe I, the gas pipe I is communicated with a flash tank, the flash tank is communicated with a gas chamber II, the blast furnace I is communicated with a gas pipe III, the gas pipe III is provided with a valve group IV, the valve group IV is communicated with the gas pipe II, and the gas pipe III is communicated with the flash tank; low-calorific-value coal gas and flash steam are introduced into high-calorific-value coal gas, so that the calorific value of the high-calorific-value coal gas is reduced, heat transfer of the heating furnace is enhanced, and temperature balance of the heating furnace is conveniently maintained, so that the problem that heat transfer of the middle-lower part of the heating furnace body is affected due to collection of the high-calorific-value coal gas and generated high-temperature waste gas in the prior art is solved; and the temperatures of the upper and lower parts of the heating furnace are unbalanced.

Description

Technical Field

[0001] The invention relates to the technical field of gas calorific value balance adjustment, and in particular to a method for adjusting the calorific value balance of hydrogen-rich carbon circulating oxygen blast furnace gas. Background Art

[0002] The hydrogen-rich carbon cycle oxygen blast furnace process is a smelting process that uses cold oxygen blast to replace traditional heated air blast. It uses full oxygen blast to remove CO2 from high calorific value coal gas through the decarbonization system to form a higher concentration of purified coal gas, which is sprayed into the tuyere of the hydrogen-rich carbon cycle oxygen blast furnace, and then uses a carbon-reducing and solid fuel-reducing ironmaking process to improve the utilization rate of blast furnace carbon. The decarbonization system refers to the high calorific value coal gas produced by the hydrogen-rich carbon cycle oxygen blast furnace, which passes through the absorption tower in turn to form purified coal gas, and forms the released flash steam in the flash tank.

[0003] The use of gas after CO2 removal for heating furnace is an innovative and unique technology of hydrogen-rich carbon circulating oxygen blast furnace. The decarbonized circulating gas heating device adopts heat storage heating furnace technology. Although the heat storage gas heating furnace of hydrogen-rich carbon circulating oxygen blast furnace has been optimized and improved on the original technology, the burner and internal refractory structure still use the burner and internal refractory structure of the traditional blast furnace. At present, the calorific value of high calorific value gas of hydrogen-rich carbon circulating oxygen blast furnace is 6500-7200kJ / Nm3, which is about 2.3 times the calorific value of 3300kJ / Nm3 of coal gas of traditional blast furnace. Due to the high calorific value of high calorific value gas of hydrogen-rich carbon circulating oxygen blast furnace, the theoretical combustion temperature is higher than the control range of furnace top temperature of 1350℃, which exceeds the design standard of furnace top refractory and has a tendency to burn.

[0004] At the same time, the calorific value of the furnace top gas is high, and the amount of waste gas generated is insufficient. The high-temperature waste gas forms a higher temperature in the furnace top area. The heat transfer in the middle and lower parts of the furnace body is affected by the insufficient amount of waste gas, making the entire temperature gradient unable to meet the uniform heating. The flue temperature is as high as 150°C, forming a "hot top and cold bottom" heating furnace. Therefore, it is necessary to explore a method to adjust the balance of high calorific value gas in the hydrogen-rich carbon circulating oxygen blast furnace, so as to reduce the probability of refractory melting and burning, increase equipment service life, and stabilize production. Summary of the invention

[0005] The purpose of the present invention is to provide a method for adjusting the calorific value balance of hydrogen-rich carbon circulating oxygen blast furnace gas, so as to solve the problem in the prior art that the high calorific value gas of the hydrogen-rich carbon circulating oxygen blast furnace has a high calorific value, which produces high-temperature exhaust gas accumulation, affects the heat transfer in the middle and lower parts of the heating furnace, and causes temperature imbalance in the heating furnace.

[0006] To achieve the above-mentioned purpose, the basic scheme provided by the present invention is: a device for adjusting the calorific value balance of hydrogen-rich carbon-cycle oxygen blast furnace gas, comprising a four-valve group, a flow regulator, a pressure detector, a flow detector and a cut-off device, the gas pipe of the hydrogen-rich carbon-cycle oxygen blast furnace is connected with gas pipe 2, gas pipe 2 is connected with the low calorific value gas pipe of blast furnace 2, the flow regulator, the pressure detector and the flow detector are all connected with gas pipe 2, gas pipe 2 is connected with gas tank 1 and gas pipe 1, gas pipe 1 is connected with the flash steam pipe of the flash tank, the flash steam pipe of the flash tank is connected with gas tank 2, the low calorific value gas pipe of blast furnace 1 is connected with gas pipe 3, the gas pipe of the hydrogen-rich carbon-cycle oxygen blast furnace and gas pipe 3 are connected through the four-valve group, and gas pipe 3 is connected with the flash steam pipe of the flash tank.

[0007] The principle and beneficial effect of the present invention are as follows: when in use, the high calorific value gas of the hydrogen-rich carbon circulating oxygen blast furnace is dusted, and then the flash steam generated by the flash tank is introduced into the high calorific value gas of the hydrogen-rich carbon circulating oxygen blast furnace, and the low calorific value gas of blast furnace one and blast furnace two is also introduced into the high calorific value gas of the hydrogen-rich carbon circulating oxygen blast furnace, so that the calorific value of the high calorific value gas of the hydrogen-rich carbon circulating oxygen blast furnace is reduced, thereby strengthening the heat transfer in the middle and lower parts of the heating furnace, facilitating the maintenance of the temperature balance in the heating furnace, and reusing the released flash steam, which can reduce resource consumption, while increasing the calorific value of the gas in the low calorific value gas of the blast furnace, thereby increasing the application range of the gas.

[0008] Scheme 2, which is a basic scheme, is a method for adjusting the calorific value balance of hydrogen-rich carbon circulating oxygen blast furnace gas, characterized in that it includes the following steps:

[0009] S1. Set the calorific value of gas in gas tank 1 and gas tank 2;

[0010] S2. The high calorific value coal gas of the hydrogen-rich carbon cycle oxygen blast furnace is divided into three streams, one stream enters the decarbonization system, one stream enters the gas pipe two, and the last stream enters the gas pipe three through the four-valve group. The low calorific value coal gas of the blast furnace one is mixed into the high calorific value coal gas of the hydrogen-rich carbon cycle oxygen blast furnace through the gas pipe three after dust removal to form a mixed gas at the gas pipe three. A part of the flash steam of the flash tank is mixed into the high calorific value coal gas of the hydrogen-rich carbon cycle oxygen blast furnace through the gas pipe three. The four-valve group, the flow regulator, the pressure detector, the flow detector and the cut-off device adjust the flow of the high calorific value coal gas of the hydrogen-rich carbon cycle oxygen blast furnace entering the gas pipes two and three according to the pressure in the hydrogen-rich carbon cycle oxygen blast furnace.

[0011] S3. The low calorific value gas from blast furnace 2 is introduced into gas pipe 2 after dust removal to form mixed gas, and part of the mixed gas is introduced into gas tank 1;

[0012] S4. The other part of the mixed gas is mixed into the other part of the flash steam in the flash tank through a gas pipe, and the mixed gas is passed into the gas tank 2;

[0013] When in use, first set the commonly used gas calorific value in gas holder one and gas holder two. Since the high calorific value gas of the hydrogen-rich carbon circulating oxygen blast furnace still has a high calorific value after dust removal, the high calorific value gas of the hydrogen-rich carbon circulating oxygen blast furnace is divided into three streams, one stream enters the decarbonization system, one stream enters the gas pipe two, and the last stream enters the gas pipe three through the four-valve group. A part of the flash steam generated by the flash tank and the low calorific value gas generated by the blast furnace one are introduced into the high calorific value gas generated by the hydrogen-rich carbon circulating oxygen blast furnace in sequence after dust removal. The low calorific value gas generated by the blast furnace two and another part of the flash steam generated by the flash tank are mixed in sequence with the high calorific value gas entering the gas pipe two. The calorific value of the high calorific value gas is reduced by mixing with the low calorific value gas, the collection of high-temperature exhaust gas is reduced, the heat transfer of the heating furnace is strengthened, and the temperature balance in the heating furnace is maintained. The released flash steam is reused, which can reduce resource consumption, increase the calorific value of the gas in the low calorific value gas of the blast furnace, and increase the application range of the gas.

[0014] Scheme 3 is the preferred option of Scheme 2. In step S1, the calorific value of the gas in the gas tank 1 is set to 4000-4500 KJ / Nm 3 The calorific value of the gas in the gas tank 2 is set to 3500-4000KJ / Nm 3 .

[0015] Scheme 4 is the preferred option of Scheme 2. In step S2, the high calorific value gas from the hydrogen-rich carbon circulating oxygen blast furnace has a flow rate of 30,000-70,000 Nm after dust removal. 3 / h, calorific value is 6500-7200KJ / Nm 3 , the flash steam flow rate of the flash tank is 5000-10000Nm 3 / h, calorific value is 1000-2000KJ / Nm 3 The flow rate of low calorific value gas from blast furnace 1 after dust removal is 190,000-260,000 Nm 3 / h, calorific value is 3000-3300KJ / Nm 3 After flash steam and low calorific value gas from blast furnace 1 are mixed with high calorific value gas from hydrogen-rich carbon circulating oxygen blast furnace, the calorific value of the mixed gas is 3500-4000KJ / Nm 3 .

[0016] Scheme 5 is the preferred option of Scheme 2. In step S3, the flow rate of the low calorific value gas from blast furnace 2 after dust removal is 300,000-400,000 Nm 3 / h, calorific value is 3000-3300KJ / Nm 3 After the low calorific value gas from blast furnace 2 is mixed into the mixed gas, the calorific value of the mixed gas is reduced to 4000-4500KJ / Nm 3 .

[0017] Scheme 6, which is the preferred embodiment of Scheme 2, in step S4, the flash steam flow rate of the flash tank is 5000-10000Nm3 / h, calorific value is 1000-2000KJ / Nm 3 , the calorific value of the mixed gas is reduced to 3500-4000KJ / Nm 3 . BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a schematic structural diagram of a device and method for adjusting the calorific value balance of hydrogen-rich carbon circulating oxygen blast furnace gas. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below through specific embodiments:

[0020] The figure marks in the drawings of the specification include: 1. Hydrogen-rich carbon cycle oxygen blast furnace, 3. Four-valve group, 4. Gas tank one, 5. Gas tank two, 6. Blast furnace one, 7. Blast furnace two, 9. Flow regulator, 10. Pressure detector, 11. Flow detector, 12. Cut-off device, 14. Gas pipe one, 15. Gas pipe two, 16. Gas pipe three, 17. Flash tank.

[0021] Example 1

[0022] like Figure 1 As shown: a device for adjusting the calorific value balance of hydrogen-rich carbon cycle oxygen blast furnace gas, comprising a four-valve group 3, a flow regulator 9, a pressure detector 10 and a flow detector 11, the gas pipe of the hydrogen-rich carbon cycle oxygen blast furnace 1 is connected with a gas pipe 2 15, the gas pipe 2 15 is connected with the low calorific value gas pipe of blast furnace 2 7, the flow regulator 9, the pressure detector 10, the flow detector 11 and the cutting device 12 are all connected with the gas pipe 2 15, the gas pipe 2 15 is connected with a gas tank 1 4 and a gas pipe 1 14, the gas pipe 1 14 is connected with the flash steam pipe of a flash tank 17, the flash steam pipe of the flash tank 17 is connected with the gas tank 2 5, the low calorific value gas pipe of blast furnace 1 6 is connected with a gas pipe 3 16, the gas pipe of the hydrogen-rich carbon cycle oxygen blast furnace 1 is connected with the gas pipe 3 16 through the four-valve group 3, and the gas pipe 3 16 is connected with the flash steam pipe of the flash tank 17.

[0023] The implementation method of this embodiment is as follows: when in use, first set the calorific value of common gas in gas cabinet 1 4 and gas cabinet 2 5. Since the high calorific value gas of hydrogen-rich carbon circulating oxygen blast furnace 1 still has a high calorific value after dust removal, the high calorific value gas is divided into three streams, one stream enters the decarbonization system, one stream enters the gas pipe 2 15, and the last stream enters the gas pipe 3 16 through the four-valve group 3. A part of the flash steam produced by the flash tank 17 and the low calorific value gas produced by the blast furnace 1 6 are mixed with the high calorific value gas, and the high calorific value gas is mixed and enters the high calorific value gas of the gas pipe 2 15. A part of the high calorific value gas mixed with the low calorific value gas produced by the blast furnace 2 7 is introduced into the gas cabinet 4, and then another part of the flash steam produced by the flash tank 17 is mixed with the high calorific value gas, and the calorific value of the high calorific value gas is reduced to the calorific value of common coal for use in heating furnaces or other users.

[0024] Example 2

[0025] like Figure 1 As shown: A method for adjusting the calorific value balance of hydrogen-rich carbon circulating oxygen blast furnace gas, characterized in that it includes the following steps:

[0026] S1. Gas tank 14 gas calorific value is set to 4000-4500KJ / Nm 3 The calorific value of the gas in gas tank 25 is set to 3500-4000KJ / Nm 3 ;

[0027] S2. The high calorific value gas from the hydrogen-rich carbon cycle oxygen blast furnace 1 is split into three streams, one stream enters the decarbonization system, one stream enters the gas pipe 2 15, and the last stream enters the gas pipe 3 16 through the four-valve group 3. The high calorific value gas flow rate is 30,000-70,000 Nm 3 / h, calorific value is 6500-7200KJ / Nm 3 After dust removal, the low calorific value gas from blast furnace 6 is mixed with the high calorific value gas from hydrogen-rich carbon circulating oxygen blast furnace 1 through gas pipe 3 16. The flow rate of low calorific value gas from blast furnace 6 is 190,000-260,000 Nm 3 / h, calorific value is 3000-3300KJ / Nm 3 , mixed to form mixed gas, a part of the flash steam in the flash tank 17 is mixed into the high calorific value gas of the hydrogen-rich carbon cycle oxygen blast furnace 1 through the gas pipe 3 16, and the flash steam flow rate is 5000-10000Nm 3 / h, calorific value is 1000-2000KJ / Nm 3 After mixing, the calorific value of the mixed gas is reduced to 3500-4000KJ / Nm 3 The four-valve group 3, the flow regulator 9, the pressure detector 10, the flow detector 11 and the cut-off device 12 adjust the flow of the high calorific value coal gas entering the gas pipe 2 15 and the gas pipe 3 16 according to the pressure in the hydrogen-rich carbon circulating oxygen blast furnace 1;

[0028] S3. The low calorific value gas from blast furnace 27 is introduced into gas pipe 215 after dust removal to form mixed gas. The flow rate of low calorific value gas from blast furnace 27 is 300,000-400,000 Nm 3 / h, calorific value is 3000-3300KJ / Nm 3 The calorific value of the mixed gas after mixing is 4000-4500KJ / Nm 3 , pass part of the mixed gas into the gas tank 4;

[0029] S4. The other part of the mixed gas is mixed into the other part of the flash steam in the flash tank 17 through the gas pipe 14, with a flow rate of 5000-10000Nm 3 / h, calorific value is 1000-2000KJ / Nm 3 The calorific value of the mixed gas after mixing is 3500-4000KJ / Nm 3 , pass the mixed gas into gas tank 25.

[0030] The implementation method of this embodiment is as follows: the high calorific value coal gas produced by the hydrogen-rich carbon cycle oxygen blast furnace 1 is divided into three streams, one stream enters the decarbonization system, one stream enters the gas pipe 2 15, and the last stream enters the gas pipe 3 16 through the four-valve group 3, with a flow rate of 30,000-70,000 Nm 3 / h, calorific value is 6500-7200KJ / Nm 3 , the flash tank 17 produces a portion of flash steam with a flow rate of 5000-10000Nm 3 / h, calorific value is 1000-2000KJ / Nm 3 , blast furnace 16 produces low calorific value gas, with a flow rate of 190,000-260,000 Nm 3 / h, calorific value is 3000-3300KJ / Nm 3 , mixed to form mixed gas, the calorific value of the mixed gas is 3500-4000KJ / Nm 3 , the low calorific value gas produced by blast furnace 27 has a flow rate of 300,000-400,000 Nm 3 / h, calorific value is 3000-3300KJ / Nm 3 , mixed into the mixed gas of gas pipe 215, the calorific value of the mixed gas is reduced to 4000-4500KJ / Nm 3 , part of the mixed gas can be used for gas calorific value requirement of 4000-4500KJ / Nm 3 The other part of the mixed gas is mixed with the other part of the flash steam produced by the flash tank 17 through the gas pipe 14, and the flash steam flow rate is 5000-10000Nm 3 / h, calorific value is 1000-2000KJ / Nm 3 , the calorific value of the mixed gas can be reduced to 3500-4000KJ / Nm 3At this time, the mixed gas can be used for gas calorific value requirements of 3500-4000KJ / Nm 3 for users, and at the same time, according to the pressure requirement in the hydrogen-rich carbon cycle oxygen blast furnace 1, the flow rate of high calorific value coal gas entering the gas pipe two 15 and the gas pipe three 16 is adjusted through the four-valve group 3, the flow regulator 9, the pressure detector 10, the flow detector 11 and the cut-off device 12; according to the furnace top pressure operation requirement in the hydrogen-rich carbon cycle oxygen blast furnace 1, the top pressure needs to be increased, and the coal gas flow entering the gas pipe two 15 and the gas pipe three 16 is reduced through the four-valve group 3 and the flow regulator 9, so that the pressure in the hydrogen-rich carbon cycle oxygen blast furnace 1 is increased, and the reaction rate of the hydrogen-rich carbon cycle oxygen blast furnace 1 is accelerated; according to the furnace top pressure operation requirement in the hydrogen-rich carbon cycle oxygen blast furnace 1, the top pressure needs to be reduced, and the coal gas flow entering the gas pipe two 15 and the gas pipe three 16 is increased through the four-valve group 3 and the flow regulator 9, so that the pressure in the hydrogen-rich carbon cycle oxygen blast furnace 1 is reduced, and the reaction rate of the hydrogen-rich carbon cycle oxygen blast furnace 1 is slowed down.

[0031] The gas flow is distributed according to the calorific value, specifically, the flow regulator 9 entering the gas pipe two 15 and the gas pipe three 16 distributes 10% of the gas flow, and the four-valve group 3 distributes 90% of the gas flow, the flow regulator 9 entering the gas pipe two 15 and the gas pipe three 16 distributes 20% of the gas flow, and the four-valve group 3 distributes 80% of the gas flow, and so on. The sum of the gas flow distributed by the flow regulator 9 entering the gas pipe two 15 and the gas pipe three 16 and the four-valve group 3 is 100%.

[0032] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A device for adjusting the calorific value balance of hydrogen-rich carbon circulating oxygen blast furnace gas, characterized in that: The invention comprises a four-valve group (3), a flow regulator (9), a pressure detector (10), a flow detector (11) and a cut-off device (12); the gas pipe of the hydrogen-rich carbon circulating oxygen blast furnace (1) is connected to a second gas pipe (15); the second gas pipe (15) is connected to a low calorific value coal gas pipe of the second blast furnace (7); the flow regulator (9), the pressure detector (10), the flow detector (11) and the cut-off device (12) are all connected to the second gas pipe (15); the second gas pipe (15) is connected to the low calorific value coal gas pipe of the second blast furnace (7); (15) is connected to a gas tank one (4) and a gas pipe one (14), the gas pipe one (14) is connected to the flash steam pipe of the flash tank (17), the flash steam pipe of the flash tank (17) is connected to a gas tank two (5), the low calorific value gas pipe of the blast furnace one (6) is connected to a gas pipe three (16), the gas pipe of the hydrogen-rich carbon cycle oxygen blast furnace (1) and the gas pipe three (16) are connected through a four-valve group (3), and the gas pipe three (16) is connected to the flash steam pipe of the flash tank (17).

2. A method for adjusting the calorific value balance of hydrogen-rich carbon circulating oxygen blast furnace gas, characterized in that , including the following steps: S1. Set the calorific value of the gas in gas tank one (4) and gas tank two (5); S2. The high calorific value coal gas of the hydrogen-rich carbon cycle oxygen blast furnace (1) is split into three streams, one stream enters the decarbonization system, one stream enters the gas pipe 2 (15), and the last stream enters the gas pipe 3 (16) through the four-valve group (3). The low calorific value coal gas of the blast furnace 1 (6) is mixed with the high calorific value coal gas of the hydrogen-rich carbon cycle oxygen blast furnace (1) through the gas pipe 3 (16) after dust removal to form a mixed gas at the gas pipe 3 (16). A part of the flash steam of the flash tank (17) is mixed with the high calorific value coal gas of the hydrogen-rich carbon cycle oxygen blast furnace (1) through the gas pipe 3 (16). The four-valve group (3), the flow regulator (9), the pressure detector (10) and the flow detector (11) adjust the flow of the high calorific value coal gas of the hydrogen-rich carbon cycle oxygen blast furnace (1) entering the gas pipe 2 (15) and the gas pipe 3 (16) according to the pressure in the hydrogen-rich carbon cycle oxygen blast furnace (1); S3. The low calorific value gas from the blast furnace II (7) is introduced into the gas pipe II (15) after dust removal to form a mixed gas, and a portion of the mixed gas is introduced into the gas tank I (4); S4. The other part of the mixed gas is mixed into the other part of the flash steam in the flash tank (17) through the gas pipe 1 (14), and the mixed gas is passed into the gas tank 2 (5).

3. The method for adjusting the calorific value balance of hydrogen-rich carbon cycle oxygen blast furnace gas according to claim 2, characterized in that: In step S1, the calorific value of the gas in the gas tank 1 (4) is set to 4000-4500 KJ / Nm 3 The calorific value of the gas in gas tank 2 (5) is set to 3500-4000KJ / Nm 3 .

4. A method for adjusting the calorific value balance of hydrogen-rich carbon cycle oxygen blast furnace gas according to claim 2, characterized in that: In step S2, the high calorific value gas from the hydrogen-rich carbon circulating oxygen blast furnace (1) has a flow rate of 30,000-70,000 Nm after dust removal. 3 / h, calorific value is 6500-7200KJ / Nm 3 The flash steam flow rate of the flash tank (17) is 5000-10000Nm 3 / h, calorific value is 1000-2000KJ / Nm 3 The flow rate of low calorific value gas from blast furnace 1 (6) after dust removal is 190,000-260,000 Nm 3 / h, calorific value is 3000-3300KJ / Nm 3 After the flash steam and the low calorific value coal gas of blast furnace 1 (6) are mixed with the high calorific value coal gas of hydrogen-rich carbon circulating oxygen blast furnace (1), the calorific value of the mixed coal gas is 3500-4000KJ / Nm 3 .

5. The method for adjusting the calorific value balance of hydrogen-rich carbon circulating oxygen blast furnace gas according to claim 2, characterized in that: In step S3, the flow rate of low calorific value gas from blast furnace 2 (7) after dust removal is 300,000-400,000 Nm 3 / h, calorific value is 3000-3300KJ / Nm 3 After the low calorific value gas from blast furnace 2 (7) is mixed into the mixed gas, the calorific value of the mixed gas is reduced to 4000-4500KJ / Nm 3 .

6. A method for adjusting the calorific value balance of hydrogen-rich carbon circulating oxygen blast furnace gas according to claim 2, characterized in that In step S4, the flash steam flow rate of the flash tank (17) is 5000-10000Nm 3 / h, calorific value is 1000-2000KJ / Nm 3 , the calorific value of the mixed gas is reduced to 3500-4000KJ / Nm 3 .

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