阅读说明：本技术 一种测试生产用煤热解过程纵向变化性能的方法和装置 (Method and device for testing longitudinal change performance of coal for production in pyrolysis process ) 是由 王玉明 毛晓明 胡德生 钱晖 徐万仁 于 2018-06-29 设计创作，主要内容包括：本发明公开了一种测试生产用煤热解过程纵向变化性能的方法和装置,该方法包括：1、将灰分为7-12％,挥发份为27-30％的煤样按测试焦炉容积70-90％的装入焦炉内,装料时自然堆积密度为820-830kg/m<Sup>3</Sup>；煤样小于3mm粒度的占比83-88％；2、将装入煤铺平；3、在炉顶装煤口安放隔热塞,隔热塞上开有竖直导向孔,导向孔内设有导向推杆,导向推杆下部连接一置放在焦炉内煤样上部铺平面上并与该铺平面面接触的触板；导向推杆上部连接一可将导向推杆竖直位移或位移幅度转换为电信号并输出到可读取媒介的感应记录装置；4、装炉煤加热至焦饼中心温度达到1000-1050℃,分析感应记录装置记录数据。(The invention discloses a method and a device for testing longitudinal change performance of a coal pyrolysis process for production, wherein the method comprises the following steps: 1. coal sample with 7-12% of ash content and 27-30% of volatile component is loaded into coke oven according to 70-90% of test coke oven volume, and the natural bulk density is 820- 3 (ii) a The coal sample is less than 83-88% of the granularity of 3 mm; 2. paving the charged coal; 3. a heat insulation plug is arranged at a coal charging port at the top of the furnace, a vertical guide hole is formed in the heat insulation plug, a guide push rod is arranged in the guide hole, and the lower part of the guide push rod is connected with a touch plate which is placed on the upper paving plane of a coal sample in the coke oven and is in contact with the paving plane; the upper part of the guide push rod is connected with a sensing recording device which can convert the vertical displacement or the displacement amplitude of the guide push rod into an electric signal and output the electric signal to a readable medium; 4. and heating the charged coal until the central temperature of the coke cake reaches 1000-.)

1. A method for testing the longitudinal change performance of the coal pyrolysis process for production is characterized by comprising the following steps:

1) the ash A is separated_dContent of 7-12%, volatile component V_dThe test coal sample with the content of 27-30 percent is put into a top-loading test coke oven according to the loading amount of 70-90 percent of the volume of the test coke oven, and the natural bulk density is 830kg/m without treatment during the loading³(ii) a The coal sample with the granularity less than 3mm of the test coal sample accounts for 83-88 percent;

2) paving the charged coal;

3) a heat insulation plug is arranged at a coal charging port at the top of the coke oven, a vertical guide hole is formed in the heat insulation plug, a guide push rod is arranged in the guide hole, and the lower part of the guide push rod is connected with a touch plate which is placed on the upper paving plane of a coal sample in the coke oven and is in contact with the paving plane; the upper part of the guide push rod is connected with a sensing recording device which can convert the vertical displacement or displacement amplitude of the guide push rod into an electric signal and output the electric signal to a readable medium;

4) and heating the charging coal at a heating speed of 2-4 ℃/min until the central temperature of the coke cake reaches 1000-.

2. The method for testing the longitudinal variability of the pyrolysis process of the coal for production according to claim 1, wherein the test coal sample in the step 1) is loaded into the test coke oven by a natural blanking mode from a coal loading port of the coke oven, and the top-loading test coke oven is a 100kg top-loading test coke oven.

3. The method for testing the longitudinal variability of performance of a pyrolysis process of coal for production according to claim 1, wherein the surface roughness of the surface of the contact plate in contact with the paved surface is 2.6-2.8.

4. The method for testing the longitudinal change performance of the pyrolysis process of the production coal as claimed in claim 1 or 3, wherein the contact surface of the contact plate and the paving plane is not less than 200x200 mm.

5. The method for testing the longitudinal variability of the performance of a pyrolysis process of coal for production according to claim 1 or 3, wherein the touch plate is a bottom plate of a frame structure.

6. The method for testing the longitudinal variability of the pyrolysis process of coal for production according to claim 1, wherein the charged coal is spread out from the upper charging port of the coke oven by using a coal leveling bar in step 2).

7. The device for testing the longitudinal change performance of the coal pyrolysis process for production is characterized by comprising a guide measuring rod capable of moving up and down along a vertical position, wherein the lower part of the guide measuring rod is connected with a force transmission component, the force transmission component is at least provided with a bottom touch plate so as to keep the expansion force formed when a coal sample is heated and expanded when the bottom touch plate is in contact with the surface of the coal sample in a coke oven, the expansion force is transmitted to the guide measuring rod through lifting the bottom touch plate, and the displacement change of the guide measuring rod along the vertical position is formed; the guide measuring rod is movably connected with one end of a horizontal barometer, the other end of the horizontal barometer is connected with a linear displacement sensor, and a fulcrum is arranged at the middle section of the horizontal barometer; the linear displacement sensor is connected with a processing system which can receive and process the sensing signals sensed by the linear displacement sensor.

8. The apparatus for testing the thermal properties of coal for production in the longitudinal direction according to claim 7, wherein the extension line of the guide pin is offset from the center line of the bottom touch plate.

9. The apparatus of claim 8, wherein the force-transmitting member is a frame, the bottom contact plate is disposed at the bottom of the frame, the size of the bottom contact plate is not less than 200x200mm, the surface roughness of the bottom contact plate is 2.6-2.9, and the extension line of the guide pin passes through 1/4 of the geometric position of the bottom contact plate.

10. The apparatus according to claim 7, wherein the linear displacement sensor is an LVDT and the processing system includes a signal conditioner and an automatic recorder.

Technical Field

The invention belongs to the technical field of coking production coal and coking coal quality testing, and particularly relates to a method and a device for testing longitudinal change performance of a pyrolysis process of production coal.

Background

China has abundant coal resources, and has high dependence proportion on coal in the process of energy utilization. Coal workers have worked on many aspects of processing and utilizing coal. The most widely used method is to produce coke by high-temperature carbonization of coal for blast furnace ironmaking, such as the related contents disclosed in chinese patent publications CN1171807A and CN 1465656A. In addition, because of the shortage of petroleum resources in China, the dependence on foreign countries exceeds more than 40%, in order to relieve the shortage of petroleum, a plurality of researchers develop researches on producing industrial petroleum by coal liquefaction, but the cost of the process is quite huge. In addition, there are technologies for producing methanol from synthesis gas obtained by gasifying coal or for using the synthesis gas as reducing gas, for example, chinese patent documents publication nos. CN1721511A and CN 86105896. There are also some patents for producing direct reduced iron using a coal gas shaft furnace, such as the related art disclosed in chinese patent documents with publication numbers CN1109911 and CN 1109510.

The molten iron produced by China is more than 8 hundred million tons every year, which has great demand on raw materials for producing coke in ironmaking, and the coke production is still a very important way for utilizing coal resources in China. The coal is heated in the coking chamber of the coke oven to produce a large amount of colloidal substances, and thermal decomposition and polymerization reactions occur, so that coke which can be used for blast furnace production is finally formed. The coke in the coking chamber changes with time and temperature, which chemical or physical reactions occur, and what the change stage is, the prior art has not been concerned with the high-temperature black box of the coking chamber. And further loses the guiding functions of controlling the temperature system in the coking process, controlling the coke quality in the coal pyrolysis coking process, controlling the formation amount of a colloidal body and adjusting the coal blending structure.

Disclosure of Invention

The invention aims to provide a method for testing the longitudinal change performance of the coal pyrolysis process for production by simulating the change process in a carbonization chamber so as to guide the subsequent production behavior.

The technical problem to be solved can be implemented by the following technical scheme.

A method for testing the longitudinal change performance of the coal pyrolysis process for production comprises the following steps:

1) the ash A is separated_dContent of 7-12%, volatile component V_dThe test coal sample with the content of 27-30 percent is put into a top-loading test coke oven according to the loading amount of 70-90 percent of the volume of the test coke oven, and the natural bulk density is 830kg/m without treatment during the loading³(ii) a The coal sample with the granularity less than 3mm of the test coal sample accounts for 83-88 percent;

2) paving the charged coal;

3) a heat insulation plug is arranged at a coal charging port at the top of the coke oven, a vertical guide hole is formed in the heat insulation plug, a guide push rod is arranged in the guide hole, and the lower part of the guide push rod is connected with a touch plate which is placed on the upper paving plane of a coal sample in the coke oven and is in contact with the paving plane; the upper part of the guide push rod is connected with a sensing recording device which can convert the vertical displacement or displacement amplitude of the guide push rod into an electric signal and output the electric signal to a readable medium;

4) and heating the charging coal at a heating speed of 2-4 ℃/min until the central temperature of the coke cake reaches 1000-.

As a preferred embodiment of the invention, the test coal sample in the step 1) is loaded into the test coke oven by adopting a natural blanking mode from a coal loading port of the coke oven, and the top-loading test coke oven is a 100kg top-loading test coke oven.

As a further improvement of the technical scheme, the surface roughness of the surface of the touch plate contacted with the paving surface is 2.6-2.8.

As another preferred embodiment of the invention, the contact surface of the contact plate and the paving plane is not less than 200x200 mm.

As a further improvement of the present technical solution, the touch panel is a bottom plate of a frame structure.

As a further improvement of the technical scheme, a coal leveling rod is adopted in the step 2) to level the charged coal from a coal charging port at the upper part of the coke oven.

The invention aims to solve another technical problem of providing a device for testing the longitudinal change performance of the coal pyrolysis process for production.

In order to solve the technical problems, the invention adopts the following technical scheme.

A device for testing the longitudinal change performance of the coal pyrolysis process for production comprises a guide measuring rod capable of moving up and down along a vertical position, wherein the lower part of the guide measuring rod is connected with a force transmission component, the force transmission component is at least provided with a bottom touch plate so as to keep the expansion force formed when a coal sample is heated and expanded when the bottom touch plate is contacted with the surface of the coal sample in a coke oven to be transmitted to the guide measuring rod through lifting the bottom touch plate, and the displacement change of the guide measuring rod along the vertical position is formed; the guide measuring rod is movably connected with one end of a horizontal barometer, the other end of the horizontal barometer is connected with a linear displacement sensor, and a fulcrum is arranged at the middle section of the horizontal barometer; the linear displacement sensor is connected with a processing system which can receive and process the sensing signals sensed by the linear displacement sensor.

As a further improvement of the device, the extension line of the guide measuring rod is deviated from the central line of the bottom touch plate.

As a preferred embodiment of the present device, the force transmission member is a frame, the bottom touch plate is disposed at the bottom of the frame, the size of the bottom touch plate is not less than 200x200mm, the surface roughness of the bottom touch plate is 2.6-2.9, and the extension line of the guide bar passes through 1/4 of the geometric position of the bottom touch plate.

In another preferred embodiment of the apparatus, the linear displacement transducer is an LVDT and the processing system includes a signal conditioner and an automatic recorder.

The method and the device for testing the longitudinal change performance of the coal for production in the pyrolysis process have the following effects:

1. the longitudinal change process caused by the thermal expansion and contraction behavior of the production coal in the coking chamber is simulated, the real behavior of the coal in the coking and coking chambers can be effectively reflected and matched, the quality of the production coal is monitored, and guidance is provided for the current in the production and coke pushing process.

2. By testing the longitudinal change performance of the coal for production, guidance can be provided for the mutual matching of the coal for coking production, and the coal can be more effectively blended.

3. By testing the longitudinal change performance of the coal for production, the quality performance of the blended coal can be correctly known, the occurrence of a difficult coke pushing process can be effectively avoided or reduced, and the damage to the furnace wall of the carbonization chamber is reduced.

4. By testing the longitudinal change performance of the coal for production, the coal blending cost can be reduced, the quality of produced coke is improved, the effective smooth operation of the coking production process is ensured, and the fuel consumption of the blast furnace is reduced, so that the production cost of the blast furnace is reduced.

The invention provides a method for measuring the longitudinal variability of coking coal, which is beneficial to monitoring the quality of coking blended coal, so that the adjustment of a coal blending structure can be guided, the occurrence of difficult coke pushing accidents is reduced or eliminated, the operation of a coking production process and a blast furnace production process is facilitated, and the coke and fuel ratio for the blast furnace is reduced.

Drawings

FIG. 1 is a schematic structural diagram of a detection device used in the method for testing the longitudinal variation performance of the coal pyrolysis process for production according to the present invention;

in the figure: 1-charged coal 2-measuring device 21-bottom plate 3-furnace top 4-heat-insulating plug 41-guide hole 5-supporting component 51-connecting sleeves 52, 53 and 54-supporting plate 6-stainless steel measuring bar 7-horizontal air pressure gauge 71-supporting point 8-LVDT 9-signal regulator 10-automatic recorder.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

The invention aims at solving the problems that a large amount of coal is pyrolyzed and coked in a carbonization chamber, the carbonization chamber is used as a high-temperature black box, the coal is invisible in the reaction process, the production cost is required to be reduced under the condition that the current steel production is in a new normal state in early winter, and the requirement of coke oven production and operation is facilitated. The longitudinal change performance of the coal is tested by the testing device, so that the effects of adjusting the coal blending structure, guiding the coal blending for coking and reducing the production cost can be achieved.

The method for testing the longitudinal variation performance of the coal for production. It is characterized in that the ash A is mixed_dContent of 7-12%, volatile component V_d70-100kg of test coal sample with the content of 27-30 percent and the particle size of 83-88 percent (mass ratio) of less than 3mm is put into a 100kg top-loading test coke oven, a natural blanking mode is adopted from a coal loading port of the coke oven, and the natural bulk density is about 820kg/m without treatment during loading³。

After the coal sample is filled, the coal filling port on the upper part of the coke oven is used for paving the coal filling 1 by using a coal leveling rod, and then a coal longitudinal change detection device for production is arranged at the coal filling port position on the top part 3 of the coke oven top.

As shown in fig. 1, the detection device is mainly composed of a measuring device 2, a heat insulation plug 4, a support member 5, a stainless steel measuring rod 6, a horizontal air pressure gauge 7, an LVDT8, a signal conditioner 9 and an automatic recorder 10.

The measuring device 2 is formed by welding two horizontal steel plates and two vertical steel plates, the material is stainless steel (1Cr18Ni9Ti), the size of the steel plate (namely, the bottom plate 21 in the figure) horizontally contacted with the furnace coal (namely, the charged coal 1 in the figure) is 200 multiplied by 3mm, the roughness Ra of the surface of the steel plate contacted with the coal is between 2.6 and 2.8, the size of the horizontal steel plate on the upper surface of the measuring device 2 is 180 multiplied by 2mm, a stainless steel measuring rod 6 is welded at the position of the steel plate at the upper part of the measuring device 2 along the extension line of the 1/4 center of the geometric position of the bottom plate (the position of the center of the bottom plate deviating to the left half in the figure), and the included angle formed by the stainless steel measuring rod 6 and the connected steel plates is 90 degrees, so that the stainless steel measuring rod 6 is.

In order to ensure that coal is isolated from the outside, a heat insulation plug 4 with a trapezoidal section is installed at a coal charging port, the heat insulation plug is made of high-temperature-resistant refractory material, a vertical guide hole 41 is formed in the heat insulation plug 4, and the heat insulation plug is actually used for limiting a stainless steel measuring rod 6 and keeping the stainless steel measuring rod to be displaced only in the vertical direction.

The stainless steel measuring rod and the horizontal air pressure gauge 7 are supported by the supporting component 5 above the heat insulation plug 4, a connecting sleeve 51 is further arranged at the joint of the supporting component 5 and the stainless steel measuring rod 6, the stainless steel measuring rod 6 is inserted into the connecting sleeve 51 and follows the connecting sleeve to keep that a supporting plate 53 in the middle of the supporting component 5 can be exactly overlapped on supporting plates 52 and 53 on two sides when the device is in an initial installation position.

The middle section of horizontal barometer 7 has set up fulcrum 71, and horizontal barometer 7's left end and stainless steel measuring staff 6 swing joint, and LVDT8 is connected to horizontal barometer 7's right-hand member, and LVDT8 links to each other with automatic recording appearance 10, is equipped with signal conditioner 9 on the automatic recording appearance 10.

When the furnace coal is heated at a heating speed of 2-4 ℃/min, the coal is pyrolyzed, volatile matters are volatilized, a colloid body is formed, the expansion and contraction processes of the coal are carried out, and the heating is stopped when the central temperature of the coke cake reaches 1050 ℃ of 1000-. In the process, the heated longitudinal change of the coal is transmitted to the LVDT8 through the conduction of the bottom plate 21 and further through the stainless steel measuring rod 6 and the horizontal pressure gauge 7, the proportional displacement amplitude is converted into an electric signal through the LVDT8, and the continuously output electric signal is recorded by the signal regulator 9 and the automatic recorder 10 with recording paper.

The following will be further described by way of specific examples.