CN110646163A - Thermal state blast furnace assembly system - Google Patents
Thermal state blast furnace assembly system Download PDFInfo
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- CN110646163A CN110646163A CN201910945195.XA CN201910945195A CN110646163A CN 110646163 A CN110646163 A CN 110646163A CN 201910945195 A CN201910945195 A CN 201910945195A CN 110646163 A CN110646163 A CN 110646163A
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Abstract
The invention relates to a thermal state blast furnace assembly system, which is used for researching the movement behavior and the heat transfer process of a gas phase and a solid phase in a furnace in detail, wherein an air compressor is connected with a surge tank, the surge tank is connected with an air heater, the air heater is communicated with a tuyere of a blast furnace body through a pipeline, the blast furnace body is provided with a plurality of pressure measuring holes and temperature measuring holes, pressure probes communicated with a pressure collecting card are arranged in the pressure measuring holes, thermocouples communicated with the temperature collecting card are arranged in the temperature measuring holes, and the pressure collecting card and the temperature collecting card are connected with a computer; the spiral feeder is arranged at the top of the blast furnace body, a discharge port of the spiral feeder supplies materials into the blast furnace body, light supplementing lamps are arranged on two sides of the blast furnace body, the high-speed camera is arranged on one side of the blast furnace body, and the material storage device is communicated with and arranged at the bottom of the blast furnace body. The assembly system can effectively explore the movement behavior and temperature evolution process of the particles in the furnace at different air inlet speeds and temperatures. The device has simple structure, easy maintenance and good working benefit.
Description
Technical Field
The invention relates to a thermal state blast furnace assembly system, and belongs to the technical field of physical experiment equipment.
Background
The blast furnace is used as important reaction equipment for steel production, and has important academic value and industrial application prospect for the stable operation of the blast furnace and the improvement of energy utilization rate by deeply researching the flow of dense gas, liquid and solid multi-phase in the furnace, the heat and mass transfer process and the energy conversion efficiency. Because the industrial-grade iron-making blast furnace belongs to a high-temperature high-pressure operation reactor, the direct data acquisition of the interior of the blast furnace still has difficulty, and the current research on the blast furnace still belongs to 'black box operation'. In recent years, effective establishment of a laboratory-scale thermal state blast furnace has become an effective means for studying the movement behavior and heat transfer characteristics of particles in the furnace. However, the blast furnace models built by numerous scholars at present mainly adopt a cold state, influence of movement behaviors of particles in the blast furnace on heat transfer characteristics is ignored, and accordingly a heat transfer mechanism in a multi-phase flow process in the blast furnace is lost, so that reasonable summary of an assembly system of the hot blast furnace is necessary for researching influence of gas-solid movement behaviors in the blast furnace on the heat transfer mechanism, and meanwhile, effective reference is provided for other people to build related hot experimental systems.
In order to effectively make up for the defects of a laboratory scale blast furnace in the field of thermal state assembly systems, the invention is designed to be reduced according to the size of a certain practical industrial blast furnace to obtain the geometric size of a body of the laboratory scale blast furnace, meanwhile, gas heating equipment is introduced, the temperature of the required heated gas is regulated in real time through a temperature control device, the evolution behaviors of particle motion and a convolution area are captured through a high-speed camera, and the evolution process of a temperature field is recorded through an infrared thermal imager.
Disclosure of Invention
Technical problem to be solved
In order to solve the above problems of the prior art, the present invention provides a thermal state blast furnace assembly system. The system can make up the defect that most researchers only build a cold-state blast furnace model to research gas-solid two-phase flow, can also provide an integral assembly system for further researching the influence rule of gas-solid multi-phase flow behavior on inter-phase heat transfer and temperature field distribution in the furnace, and can also provide reference for design of related thermal-state systems by other subsequent personnel.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
a thermal state blast furnace assembly system comprises an air compressor, a pressure stabilizing tank, an air heater, a screw feeder, a material storage device, a blast furnace body, a pressure probe, a pressure acquisition card, a temperature acquisition card, a computer, a light supplement lamp and a high-speed camera, wherein the air compressor is connected with the pressure stabilizing tank, the pressure stabilizing tank is connected with the air heater, the air heater is communicated with a tuyere of the blast furnace body through a pipeline, a plurality of pressure measuring holes and temperature measuring holes are formed in the blast furnace body, the pressure probe communicated with the pressure acquisition card is arranged in each pressure measuring hole, a thermocouple communicated with the temperature acquisition card is arranged in each temperature measuring hole, and the pressure acquisition card and the temperature; the spiral feeder is arranged at the top of the blast furnace body, a discharge port of the spiral feeder supplies materials into the blast furnace body, light supplementing lamps are arranged on two sides of the blast furnace body, the high-speed camera is arranged on one side of the blast furnace body, and the material storage device is communicated with and arranged at the bottom of the blast furnace body.
In the above thermal state blast furnace assembly system, preferably, the gas generated by the air compressor can be stored in the surge tank, and the surge tank can provide a continuous and stable gas pressure to the interior of the furnace body, and the volume of the surge tank is 1m3～3m3。
In the working process of the system, the air compressor conveys high-pressure gas to the pressure stabilizing tank, and hot air heated by the air heater is conveyed into a furnace of the blast furnace.
According to the above thermal state blast furnace assembly system, preferably, a thermocouple is arranged at the front edge of the air inlet of the blast furnace body, and a temperature control box is arranged outside a pipeline between the air heater and the air inlet of the blast furnace body and controls the working condition of the thermocouple.
That is to say, the temperature control box can adjust the temperature value of the required heated air in real time through the temperature feedback of the thermocouple at the front edge of the air opening.
In the above thermal state blast furnace assembly system, preferably, a rotameter is arranged on the front end pipeline of the tuyere of the blast furnace body.
The thermal state blast furnace assembly system is characterized in that an infrared thermal imager is preferably arranged on the front wall surface facing the blast furnace body, and the front wall surface of the blast furnace body is made of 6-8 mm thick infrared temperature measurement imaging glass with infrared transmittance of 94% or more, so as to ensure that the infrared thermal imager can effectively collect the distribution condition of the temperature field in the furnace; the rest wall surfaces are made of high borosilicate glass with the thickness of 6 mm-8 mm so as to reduce the influence on thermal imaging caused by the refraction of the infrared ray by the inner wall surface.
According to the thermal state blast furnace assembly system, preferably, the front wall surface of the blast furnace body is exposed, and the rest wall surfaces are covered with the asbestos heat insulation layer with the thickness of 1 cm-3 cm, so as to prevent more radiation heat loss in the heat transfer process.
In the hot blast furnace assembly system, the discharge opening of the material storage device is preferably connected with a screw discharger in a sealing manner, and the other end of the screw discharger is communicated with a material storage box in a sealing manner.
The spiral unloading machine can convey particles to the storage box at the end of an experiment, and the storage box and a connecting pipeline thereof are arranged in a sealing manner so as to prevent gas leakage in the whole system.
In the above thermal state blast furnace assembly system, preferably, a pressure reducing valve and a pressure control valve are arranged on a connecting pipeline between the air compressor and the surge tank.
In the above thermal state blast furnace assembly system, preferably, a pressure control valve is arranged on a connecting pipeline between the surge tank and the air heater, and a pressure control valve is arranged on a connecting pipeline between the air heater and the blast furnace body.
In the above hot blast furnace assembly system, preferably, the feed inlet of the blast furnace body is provided with a funnel
(III) advantageous effects
The invention has the beneficial effects that:
the hot-state blast furnace assembly system provided by the invention is based on a certain actual industrial blast furnace, has a higher practical application background, is used for researching the gas-solid two-phase motion behavior and the heat transfer process in the furnace in detail, can make up the defect that most researchers only build a cold-state blast furnace model to research the gas-solid two-phase flow, can also provide an integral assembly system for further researching the influence rule of the gas-solid multi-phase motion behavior at different air inlet speeds and temperatures on the inter-phase heat transfer and the temperature field distribution in the furnace, and can also provide reference for other follow-up personnel to design related hot-state systems.
The whole assembly system related by the invention has clear design thought, the blast furnace body has simple structure and easy maintenance, the heating equipment and the temperature control system have higher efficiency and safe operation, the applicability is stronger, and the working efficiency is good.
Drawings
FIG. 1 is a schematic overall process flow diagram of a preferred embodiment;
FIG. 2 is a schematic size view of a flat-trough blast furnace model.
[ description of reference ]
1: an air compressor;
2: a surge tank;
3: an air heater;
4: a temperature control box;
5: a screw unloader;
6: a material storage box;
7: a blast furnace body;
8: a pressure/temperature measurement port;
9: a temperature acquisition card;
10: a pressure acquisition card;
11: a computer;
12: a screw feeder;
13: a particle hopper;
14: a light supplement lamp;
15: a high-speed camera;
16: a thermal infrared imager;
17: a stocker;
l1: a pressure reducing valve;
L2-L4: a pressure control valve;
r1: a thermocouple;
z1: a rotameter.
Detailed Description
In order to explore the influence rule of gas-solid multi-phase flow behavior on the heat transfer among phases in the blast furnace and the distribution of the temperature field, the invention takes a certain practical industrial blast furnace as a design basis, effectively heats experimental gas through heating equipment and a temperature control device, and records the evolution process of the temperature field in the furnace through an infrared thermal imager. The assembly system of the thermal state blast furnace is elaborated in detail in the whole text, the whole process is clear in thought, and reproducibility is strong; the device has simple structure, easy maintenance and good working benefit.
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail below with reference to the accompanying drawings by way of specific embodiments.
Example 1
A thermal state blast furnace assembly system is shown in a schematic process flow diagram in figure 1 and mainly comprises an air compressor 1, a pressure stabilizing tank 2, an air heater 3, a temperature control box 4, a blast furnace body 7, a temperature acquisition card 9, a pressure acquisition card 10, a high-speed camera 15, an infrared thermal imager 16, a spiral unloader 5, a storage box 6, a rotor flow meter Z1 and a tuyere front edge thermocouple R1, wherein the air compressor 1 is connected with the pressure stabilizing tank 2, the pressure stabilizing tank 2 is connected with the air heater 3, the air heater 3 is communicated with a tuyere of the blast furnace body 7 through a pipeline, a pressure/temperature measurement hole 8 is arranged on the blast furnace body 7, and pressure and temperature are respectively transmitted to the pressure acquisition card 10 and the temperature acquisition card 9 through a pressure probe and a thermocouple and are finally transmitted to a computer 11; the screw feeder 12 is arranged at the top of the blast furnace body, a discharge port of the screw feeder supplies materials into the blast furnace body, the upper end of the blast furnace body 7 is provided with a funnel 13, and particles are added into the blast furnace body 7 through the screw feeder 12 and the funnel 13; light filling lamp 14 and high-speed camera 15 have been arranged to 7 both sides of blast furnace body for catch interior granule motion and spatial distribution, the bottom of blast furnace body 7 is equipped with stocker 17, and export intercommunication screw unloader 5 of stocker 17 below, the other end intercommunication storage case 6 of screw unloader 5, accessible screw unloader carries the storage case with the granule when the experiment finishes. In order to achieve the hot air required for the tuyere injection in the furnace, the air supply system will be described in detail as follows. The air compressor 1 is connected with the surge tank 2 through a pipeline, high-pressure gas is input into the surge tank 2 to maintain the stability of air inlet pressure required by a blast furnace tuyere, the surge tank 2 is connected with the air heater 3 through a pipeline, the surge gas flows through the air preheater to be rapidly heated, the air heater 3 is connected with an air inlet of the blast furnace body 7 through a pipeline, a temperature control box 4, a rotor flow meter Z1 and a tuyere front edge thermocouple R1 are arranged outside the pipeline, and the temperature control box controls the working condition of the thermocouple; the temperature control box can adjust the temperature value of the required heated air in real time through the temperature feedback of the thermocouple at the front edge of the air port. The stabilized pressure gas heats 3 the air to a specified temperature through the temperature control box 4 under the feedback of the thermocouple R1, and the required intake air flow rate is regulated by the rotameter Z1.
The screw feeder 12 is fixedly arranged at the top of the blast furnace body 7 through a bracket, and particles are added into the furnace body through a funnel 13 according to a certain feeding rate according to actual needs and are stacked to a specified height. When gas is injected into the furnace, particles start to move and gradually form a stable convolution area structure in the evolution process, the pressure probe and the thermocouple respectively acquire pressure and temperature data in real time through the pressure measuring/temperature measuring hole 8 and transmit the data to the pressure acquisition card 10 and the temperature acquisition card 9, and finally transmit the data to the computer 11.
The front wall surface of the blast furnace body 7 is made of 6mm thick infrared temperature measurement imaging glass with infrared transmittance of 94%, the front wall surface facing the blast furnace body is provided with an infrared thermal imager 16, and the infrared thermal imager 16 is used for ensuring that the infrared thermal imager can effectively collect the distribution condition of the temperature field in the furnace; the rest wall surfaces are made of high borosilicate glass with the thickness of 6mm, so that the influence on thermal imaging caused by the refraction of the inner wall surface to infrared rays is reduced. Meanwhile, the infrared thermal imaging instrument 16 can record the evolution process of the temperature field in the furnace. Except that the front wall surface of the blast furnace body is exposed, the rest wall surfaces of the blast furnace body are coated with asbestos heat insulation layers with the thickness of 2cm so as to prevent more radiation heat loss in the heat transfer process.
Example 2
In the embodiment, on the basis of embodiment 1, a pressure reducing valve L1 and a pressure control valve L2 are arranged on a connecting pipeline between the air compressor 1 and the pressure stabilizing tank 2; a pressure control valve L3 is arranged on a connecting pipeline of the pressure stabilizing tank 2 and the air heating 3, a pressure control valve L4 is arranged on a connecting pipeline of the air heating 3 and the blast furnace body 7, and before an experiment begins, the tightness of flange joints, rubber gaskets, valves, pipe fittings and other parts of the whole device are carefully checked. The rotary ball valve L3 is closed, the rotary ball valve L2 is opened, and the air compressor 1 is turned on, while the required air pressure is adjusted to a predetermined value by turning on the rotary ball valve L1 and the gas surge tank is filled. Then, the rotary ball valves L3 and L4 are sequentially opened, the air is heated to the designated temperature by adjusting the temperature control box 4, the rotameter Z1 is adjusted, the gas with different flow rates and different temperatures flows through the blast furnace tuyere to heat the particles in the furnace, and finally the gas flows through the top of the bed layer and is discharged.
In the experimental process, the high-speed camera 15 shoots and records the movement behaviors of the particles in the bed at different moments and the evolution process of the convolution region along with time in real time, and meanwhile, the infrared thermal imaging instrument 16 records the evolution process of the temperature field in the furnace. After the experiment was completed, the pellets were transported to the hopper 16 by the screw discharger 15. If the next experiment is performed using different kinds of particles, a small amount of particles that were not completely discharged last time may be temporarily stored in the blast furnace bottom hopper 17 so as not to affect the next experiment operation.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art can change or modify the technical content disclosed above into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (10)
1. A thermal state blast furnace assembly system is characterized by comprising an air compressor, a pressure stabilizing tank, an air heater, a screw feeder, a material storage device, a blast furnace body, a pressure probe, a pressure acquisition card, a temperature acquisition card, a computer, a light supplement lamp and a high-speed camera, wherein the air compressor is connected with the pressure stabilizing tank, the pressure stabilizing tank is connected with the air heater, the air heater is communicated with a tuyere of the blast furnace body through a pipeline, a plurality of pressure measurement holes and temperature measurement holes are formed in the blast furnace body, the pressure probe communicated with the pressure acquisition card is arranged in each pressure measurement hole, and a thermocouple communicated with the temperature acquisition card is arranged in each temperature measurement hole and is connected with the computer; the spiral feeder is arranged at the top of the blast furnace body, a discharge port of the spiral feeder supplies materials into the blast furnace body, light supplementing lamps are arranged on two sides of the blast furnace body, the high-speed camera is arranged on one side of the blast furnace body, and the material storage device is communicated and arranged at the bottom of the blast furnace body.
2. The system of claim 1, wherein the gas generated by the air compressor can be stored in a surge tank, and the surge tank can provide a continuous and stable gas pressure to the interior of the furnace body, and the volume of the surge tank is 1m3～3m3。
3. The system as claimed in claim 1, wherein a thermocouple is provided at a front edge of the air inlet of the blast furnace body, and a temperature control box is provided outside a pipe between the air heater and the air inlet of the blast furnace body, the temperature control box controlling the operation of the thermocouple.
4. The system as claimed in claim 1, wherein a rotameter is provided on a front end pipe of the tuyere of the blast furnace body, and a pressure control valve is provided on a front end of the rotameter.
5. The system according to claim 1, wherein an infrared thermal imager is provided on a front wall surface facing the blast furnace body, the front wall surface of the blast furnace body is made of 6mm to 8mm thick infrared thermometric imaging glass having an infrared transmittance of 94% or more, and the remaining wall surfaces are made of 6mm to 8mm thick high borosilicate glass.
6. The system of claim 1, wherein the front wall of the blast furnace body is exposed, and the rest walls are covered with an asbestos insulation layer with the thickness of 1 cm-3 cm.
7. The system of claim 1, wherein the hopper discharge port is sealingly connected to a screw unloader, the screw unloader having an opposite end sealingly connected to a storage bin.
8. The system as claimed in claim 1, wherein a pressure reducing valve and a pressure control valve are provided on a connection pipe between the air compressor and the surge tank.
9. The system of claim 1, wherein a pressure control valve is provided on a connection pipe of the surge tank and the air heater, and a pressure control valve is provided on a connection pipe of the air heater and the blast furnace body.
10. The system of claim 1, wherein the feed inlet of the blast furnace body is provided with a funnel.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111707698A (en) * | 2020-07-16 | 2020-09-25 | 西安交通大学 | Experimental device and test method for high-temperature calcination reaction characteristics in flow and temperature cooperative alternating heating mode |
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