Novel method for accurately judging maturity of coke

Abstract

The invention particularly discloses a novel method for accurately judging the maturity of coke, and relates to the technical field of coke oven thermal regulation. The method sequentially comprises the following steps: preparing instruments and equipment, selecting a carbonization chamber, measuring a coal line, installing a coal charging hole cover for measurement, inserting a seamless steel pipe, inserting a thermocouple, sealing the coal charging hole cover for measurement, preheating a thermodetector, recording temperature data, pulling out the seamless steel pipe, measuring a coke line, and observing the maturity condition of a coke cake. The method is mainly applied to a large coke oven, the center temperature of a coke cake is measured by taking the heating horizontal height as a reference, the maximum value of a coke line is obtained according to historical data of the coke line, data between the maximum value and the heating horizontal height line is taken as a part of the length of a temperature measuring tube of the coke cake, and the temperature of the coke cake is measured according to the corresponding relation between the fire falling time and the center temperature of the coke cake. And the center temperature 850 DEG C of the coke cake is used as a mature mark, so that the accuracy of judging the center temperature of the coke cake is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of coke oven thermal engineering, and particularly relates to a new method for accurately judging the maturity of coke. Background Art

[0002] With the development trend of the enlargement of coke ovens, when the traditional method for measuring the coke cake of a 4.3m coke oven is applied to a 7m coke oven, there is a phenomenon of poor applicability. The data of the length of the coke cake measuring tube and the center temperature of the coke cake specified in the group standard are not accurate enough for judging the maturity of the coke cake in actual production. Therefore, it is necessary to optimize the current method for measuring the coke cake.

[0003] The definition of the heating level height of a coke oven refers to the vertical distance between the lower surface of the combustion chamber roof and the lower surface of the carbonization chamber roof. This dimension is of great significance in the coke oven structure. Specifically, the heating level height is a quantitative expression of the height difference between the combustion chamber and the carbonization chamber roof. Generally, the height of the combustion chamber is lower than that of the carbonization chamber, so the difference between the two is the heating level height.

[0004] Table 1 Heating level heights of various types of coke ovens

[0005] Serial number Model Heating horizontal height / mm 1 4.3m coke oven 600 2 5.5m coke oven 800 3 6m coke oven 1005 4 7m coke oven 1250 5 7.65m coke oven 1500

[0006] As can be seen from Table 1, with the increase in the height of the coke oven, in order to reduce the temperature in the top space of the oven, the design unit has adopted a design method of gradually increasing the heating level height of the coke oven. Although this measure reduces the temperature in the top space of the oven, the coal material above the heating level height cannot be directly heated by the vertical flue. Therefore, in daily production, the center temperature of the coke cake in coke ovens above 6m often needs to be increased to 1150°C to be fully mature, which is contradictory to 1050±°C in the group standard. Summary of the Invention

[0007] The purpose of the present invention is to provide a new method for accurately judging the maturity of coke to solve the problem of a large error between the traditional judgment of the maturity of the coke cake in a large coke oven and the center temperature of the coke cake.

[0008] To achieve the above purpose, the present invention provides the following technical solution: A new method for accurately judging the maturity of coke, the method sequentially includes the following steps:

[0009] S1. Preparation of instrument and equipment: Prepare a K-type thermocouple thermometer, a charging hole cover for measurement, tools for measuring the coal line and the coke line; multiple seamless steel pipes;

[0010] S2. Selection of carbonization chamber: Select a carbonization chamber with good furnace body conditions, uniform and normal temperatures in the two-side combustion chambers, and stable coking time;

[0011] S3. Measure the coal line: After the coal levelling in the selected coking chamber is completed, confirm that the high-pressure ammonia water valve of the measured coking chamber is open, and measure the coal line at the coal charging holes on both the machine side and the coke side;

[0012] S4. Install the coal charging hole covers for measurement: Replace all the coal charging hole covers on both the machine side and the coke side with the coal charging hole covers for measurement;

[0013] S5. Insert the seamless steel pipe: Vertically insert the seamless steel pipe into the coal material through the coal charging hole cover for measurement, and seal it after insertion;

[0014] S6. Insert the thermocouple: Insert the thermocouple of the K-type thermocouple thermometer into the seamless steel pipe until it reaches the end of the pipe;

[0015] S7. Seal the coal charging hole cover for measurement: Seal the coal charging hole cover for measurement tightly, and close the high-pressure ammonia water valve of the measured coking chamber;

[0016] S8. Preheat the thermometer: Preheat the K-type thermocouple thermometer in advance before measurement to make the cold-junction compensation temperature of the K-type thermocouple thermometer consistent with the cold-junction temperature of the measured K-type thermocouple;

[0017] S9. Record the temperature data: Measure the temperature of each thermocouple and record the data within 6 hours ± 5 minutes before coke pushing, and record the data every half hour;

[0018] S10. Pull out the seamless steel pipe: Within 30 minutes ± 5 minutes before coke pushing, after measuring the temperature of each thermocouple for the last time and recording the data, close the flap of the water seal valve, open the riser cover, and pull out all the seamless steel pipes;

[0019] S11. Measure the coke line: Measure the coke line at the coal charging holes on both the machine side and the coke side and record the data;

[0020] S12. Observe the maturity of the coke cake: Observe the maturity of the pushed coke cake during coke pushing and record the coke pushing current.

[0021] Preferably, the K-type thermocouple thermometer is required to have a cold-junction compensation function and an accuracy of 1°C.

[0022] Preferably, a Φ60 round hole is drilled on the center line of the coal charging hole cover for measurement.

[0023] Preferably, the straight pipe section length of the seamless steel pipe is the thickness of the furnace top brick + the maximum height of the coke line, and the end of the steel pipe is a closed pointed head with a pointed head length of 150 mm.

[0024] Preferably, the center line of the round hole of the coal charging hole cover for measurement described in step S4 should coincide with the center of the coking chamber.

[0025] Preferably, in step S5, ceramic fiber blankets and mud are used to seal the gaps.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] For the first time, the center temperature of the coke cake is corresponded to the theoretical data in the fire falling management, avoiding the large difference between the theoretical center temperature of the coke cake and the actual one caused by the enlargement of the coke oven, and improving the accuracy and reliability of the coke oven process control. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. Among them:

[0029] Figure 1 It is a schematic diagram of seamless steel pipe shown in the method of the embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following will make a detailed description of the specific embodiments of the present invention with reference to the drawings of the specification.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0032] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure or characteristic that can be included in at least one implementation manner of the present invention. The "in one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it a separate or alternative embodiment that excludes other embodiments.

[0033] Embodiment

[0034] This embodiment provides a new method for accurately judging the maturity of coke. The method sequentially includes the following steps:

[0035] S1. Preparation of instrument and equipment: Prepare a K-type thermocouple thermometer with cold junction compensation, with an accuracy of 1 °C; a measuring coal charging hole cover with a Φ60 round hole drilled on the center line; tools for measuring the coal line and coke line; 4 seamless steel pipes, the straight pipe section length is the thickness of the furnace top brick + the maximum height of the coke line, and the end of the steel pipe is a closed pointed head, and the length of the pointed head part: 150 mm.

[0036] S2. Selection of carbonization chamber: Select a carbonization chamber with good furnace body condition, uniform and normal temperature in the combustion chambers on both sides, and stable coking time.

[0037] S3. Measure the coal line: After the flat coal charging in the selected coke chamber is completed, confirm that the high-pressure ammonia water valve of the measured coke chamber is opened, and measure the coal line at the coal charging holes on both the machine side and the coke side.

[0038] S4. Install the measuring coal charging hole cover: Replace the four coal charging holes on both the machine side and the coke side with measuring coal charging hole covers. The center line of the round hole of the measuring coal charging hole cover should coincide with the center of the coke chamber.

[0039] S5. Insert the seamless steel pipe ( Figure 1 mid-temperature measuring pipe): Vertically insert the seamless steel pipe through the round hole of the measuring coal charging hole cover into the coal material. After insertion, seal the gap with ceramic fiber blanket and mud.

[0040] S6. Insert the thermocouple: Insert the thermocouple of the K-type thermocouple thermometer into the seamless steel pipe and insert it to the end of the pipe.

[0041] S7. Seal the measuring coal charging hole cover: Seal the measuring coal charging hole cover tightly and close the high-pressure ammonia water valve of the measured coke chamber.

[0042] S8. Preheat the thermometer: Preheat the K-type thermocouple thermometer in advance before measurement to make the cold-end compensation temperature of the K-type thermocouple thermometer consistent with the cold-end temperature of the measured K-type thermocouple.

[0043] S9. Record the temperature data: Within 6 hours ± 5 minutes before coke pushing, measure the temperature of each thermocouple and record the data, and then record the data every half hour.

[0044] S10. Pull out the steel pipe: Within 30 minutes ± 5 minutes before coke pushing, after the last measurement of the temperature of each thermocouple and recording the data, close the flap of the water seal valve, open the riser cover, and pull out each steel pipe.

[0045] S11. Measure the coke line: Measure the coke line at the coal charging holes on both the machine side and the coke side and record the data.

[0046] S12. Observe the maturity of the coke cake: Observe the maturity of the pushed coke cake during coke pushing and record the coke pushing current.

[0047] Apply the method of this embodiment to a group of coke ovens numbered 1# and 2#, which are 2×65-hole JNX3-70-1 type 7m coke ovens. This coke oven is heated by blast furnace gas, with a turnover time of 26:00 hours and a standard temperature of 1235 / 1375 °C.

[0048] The heating level height of this 7m coke oven is 1250 mm, the thickness of the furnace top brick is 1500 mm, the coke line (range 500 - 1000 mm), the furnace top space height is 450 ± 100 mm. Therefore, four seamless steel pipes are made ( Figure 1(the short temperature measuring tube in it), the straight pipe sections of the four seamless steel pipes have a length of 1500 + 1000 = 2500 mm, excluding the pointed heads and the parts exposed above the furnace top, and are used to specifically measure the coke maturity above the heating level height.

[0049] Through the above method, the temperature of each thermocouple measured for the last time in step 10 is 836 °C, that is, the center temperature of the coke cake measured above the heating level height of 2.5 m is 836 °C. According to the theory of fire drop management, through the corresponding relationship between the fire drop time and the center temperature of the coke cake, taking the center temperature of the coke cake of 850 °C as the sign of maturity, that is, the center temperature of the coke cake corresponding to the fire drop moment is 850 °C, which has a strong correspondence with 836 °C. Therefore, this measurement method conforms to the theory. Further, observe the maturity of the coke cake in step 12: When pushing the coke, observe that the maturity of the pushed coke cake has reached the standard, further verifying the reliability and accuracy of the method of this embodiment.

[0050] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A new method for accurately judging the maturity of coke, characterized in that: The method comprises the following steps in sequence: S1. Instrument and equipment preparation: prepare K-type thermocouple thermometer, coal hole cover for measurement, coal line and coke line measurement tools; multiple seamless steel pipes; S2. Select the carbonization chamber: select the carbonization chamber with good furnace condition, uniform and normal temperature of the combustion chambers on both sides, and stable coking time; S3. Measuring coal line: After the selected carbonization chamber is loaded with flat coal, confirm that the high-pressure ammonia valve of the measured carbonization chamber is open, and measure the coal line from the coal loading holes on both sides of the machine coke; S4. Install the coal loading hole covers for measurement: replace all the coal loading holes on both sides of the machine with coal loading hole covers for measurement; S5. Insert seamless steel pipe: insert the seamless steel pipe vertically into the coal material with the coal loading hole cover after measurement, and seal it after insertion; S6. Insert the thermocouple: insert the thermocouple of the K-type thermocouple thermometer into the seamless steel pipe to the end of the pipe; S7. Seal the coal loading hole cover for measurement: Seal the coal loading hole cover for measurement tightly and close the high-pressure ammonia valve of the measured carbonization chamber; S8. Preheat the thermometer: Preheat the K-type thermocouple thermometer before measurement to make the cold end compensation temperature of the K-type thermocouple thermometer consistent with the cold end temperature of the measured K-type thermocouple; S9. Record temperature data: Measure the temperature of each thermocouple and record the data within 6 hours ± 5 minutes before pushing the focus, and record the data every half hour; S10. Pull out seamless steel pipes: within half an hour ± 5 minutes before pushing the coke, measure the temperature of each thermocouple for the last time and record the data, close the water seal valve flap, open the riser cover, and pull out all seamless steel pipes; S11. Measure the focal line: measure the focal line at the coal loading holes on both sides of the machine coke and record the data; S12. Observe the maturity of the coke cake: observe the maturity of the coke cake when pushing the coke, and record the pushing current.

2. The new method for accurately judging the maturity of coke according to claim 1 is characterized in that: The K-type thermocouple temperature measuring instrument is required to have a cold end compensation function and an accuracy of 1°C.

3. The new method for accurately judging the maturity of coke according to claim 1, characterized in that: A Φ60 circular hole is drilled on the center line of the coal loading hole cover for measurement.

4. The new method for accurately judging the maturity of coke according to claim 1, characterized in that: The length of the straight pipe section of the seamless steel pipe is the thickness of the furnace roof brick + the maximum height of the focal line. The end of the steel pipe is a closed tip, and the length of the tip part is 150 mm.

5. The new method for accurately judging the maturity of coke according to claim 3, characterized in that: The center line of the circular hole of the coal loading hole cover for measurement in step S4 should coincide with the center of the carbonization chamber.

6. The new method for accurately judging the maturity of coke according to claim 1, characterized in that: Step S5: sealing the gap with ceramic fiber blanket and mud.

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