CN113088593B - Cooling system for lower valve box of blast furnace and using method thereof - Google Patents
Cooling system for lower valve box of blast furnace and using method thereof Download PDFInfo
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- CN113088593B CN113088593B CN202110362279.8A CN202110362279A CN113088593B CN 113088593 B CN113088593 B CN 113088593B CN 202110362279 A CN202110362279 A CN 202110362279A CN 113088593 B CN113088593 B CN 113088593B
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Abstract
The invention relates to the field of blast furnace cooling equipment, in particular to a cooling system for a lower valve box of a blast furnace and a using method thereof, wherein the cooling system comprises a supply mechanism, a cooling mechanism and a cooling mechanism, wherein the supply mechanism is connected with the lower valve box through a pipeline mechanism; the pipeline mechanism comprises a cooling pipeline and a vortex tube refrigerator; the supply mechanism is connected with a vortex tube refrigerator through a cooling pipeline, and the vortex tube refrigerator is connected with the lower valve box. The invention discloses a cooling system for a lower valve box of a blast furnace, which is characterized in that a vortex tube refrigerator is added in a traditional boiler cooling system, and the nitrogen cooling efficiency of the valve box is optimized under the condition of keeping a part of pipeline structures; the purposes of energy conservation and consumption reduction are realized.
Description
Technical Field
The invention relates to the field of blast furnace cooling equipment, in particular to a cooling system for a lower valve box of a blast furnace and a using method thereof.
Background
The lower valve box of key equipment at the top of a large-scale blast furnace at home and abroad is cooled by nitrogen, and because the lower valve box is structurally communicated with the inside of the furnace, a lower sealing valve seat inside the lower valve box is directly exposed to a high-temperature environment of 150-300 ℃ all year round, in order to ensure the safe use of a silica gel sealing ring of the lower sealing valve, the lower sealing valve is cooled by using low-pressure nitrogen of 0.7-0.8 MPa in design, and a large amount of nitrogen is consumed.
In order to ensure the safe use of the lower sealing valve silica gel sealing ring for 4-5 months, the currently used low-pressure nitrogen is conveyed to a nitrogen tank at the top of a furnace for 50m3 through a pipeline for storage, the initial temperature before entering a lower valve box is greatly influenced by the environmental temperature, particularly the maximum temperature of the nitrogen exposed to direct sunlight in summer (5-10 months) is about 50 ℃ or even higher, and under the influence of the factors, the higher nitrogen is required to be consumed to ensure the equipment operation requirements of the management temperature of the lower sealing valve seat being less than or equal to 130 ℃ and the working temperature being 110 +/-10 ℃, the average cooling dosage of the nitrogen in the lower valve box is at least 2200m3/h, and a larger energy-saving and consumption-reducing space exists.
On the premise that the furnace top temperature and the summer environment temperature cannot be effectively improved and the requirements of equipment management temperature and working temperature are met, if the aims of saving energy and reducing consumption are further fulfilled, only a new technology is adopted to improve the nitrogen cooling efficiency of the lower valve box, so that the cooling medium with a lower temperature is continuously obtained.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a cooling system which is low in modification cost and can be used for cooling a lower valve box of a blast furnace.
In order to achieve the purpose, the invention adopts the technical scheme that:
a cooling system for a lower valve box of a blast furnace comprises a supply mechanism, a cooling mechanism and a cooling mechanism, wherein the supply mechanism is connected with the lower valve box through a pipeline mechanism; the pipeline mechanism comprises a cooling pipeline and a vortex tube refrigerator; the supply mechanism is connected with a vortex tube refrigerator through a cooling pipeline, and the vortex tube refrigerator is connected with the lower valve box.
The cooling pipeline comprises a first conveying pipeline and a second conveying pipeline, the supply mechanism is connected with the second conveying pipeline through the first conveying pipeline, one end of the second conveying pipeline is connected with the first conveying pipeline, and the other end of the second conveying pipeline is connected with the lower valve box; the first conveying pipeline and the second conveying pipeline are connected through a bridging pipeline; and the bridge pipeline is connected with a vortex tube refrigerator.
The bridging conduit comprises a first branch conduit and a second branch conduit; one end of the first branch pipeline is connected with the first conveying pipeline, the other end of the first branch pipeline is connected with a medium inlet end of the vortex tube refrigerator, one end of the second branch pipeline is connected with a cold air outlet end of the vortex tube refrigerator, and the other end of the second branch pipeline is connected with the second conveying pipeline.
The bridging conduit further comprises a third branch conduit; and one end of the third branch pipeline is connected with the first conveying pipeline, and the other end of the third branch pipeline is connected with the second branch pipeline.
The first branch pipeline, the second branch pipeline and the third branch pipeline are all provided with control ball valves; and the control ball valve on the second branch pipeline is arranged in the area between the vortex tube refrigerator and the joint of the third branch pipeline and the second branch pipeline.
The hot gas outlet end of the vortex tube refrigerator is connected with a hot gas diffusion tube; and a hot gas diffusion valve is arranged on the hot gas diffusion pipe.
The hot gas diffuses the union coupling and has a condensation mechanism, condensation mechanism includes the condenser, and the gas inlet point on the condenser is connected with the hot gas diffuses the pipe, the gas outlet end of condenser is connected with second branch pipeline through the fourth branch pipeline.
The second conveying pipeline is provided with a corrugated pipe; and a first control valve is arranged on the first conveying pipeline, and a second control valve is arranged on the second conveying pipeline.
A use method of a cooling system for a lower valve box of a blast furnace comprises the following steps:
step 1: the cooling system is assembled, and the supply mechanism is connected with the lower valve box through the pipeline mechanism; connecting a medium inlet end of a vortex tube refrigerator with a first branch pipeline; connecting a cold air outlet end of the vortex tube refrigerator with a second branch pipeline; connecting a hot gas outlet end of the vortex tube refrigerator with a hot gas diffusion pipeline; the second branch pipeline is connected with a second conveying pipeline through a corrugated pipe;
step 2: after the step 1 is finished, fixing the vortex tube refrigerator and each pipeline structure by a set bracket or a support according to the specification;
and step 3: after the step 2 is finished, when the lower valve box is required to be cooled, the second control valve and the hot gas bleeding valve are opened; simultaneously closing the control ball valve on the third branch pipeline, and opening the control ball valves on the first branch pipeline and the second branch pipeline to enable the vortex tube refrigerator to be connected into the lower valve box refrigeration pipeline; additionally opening a first control valve on the first delivery conduit;
and 4, step 4: after the step 3 is finished, a mechanical temperature control valve arranged at the hot gas outlet end of the vortex tube refrigerator is opened, and the opening degree of the mechanical temperature control valve is adjusted to enable the temperature of the hot gas outlet end to be proper, namely the temperature of a cold gas outlet of the vortex tube refrigerator to be proper, so that the lower valve box is cooled;
and 5: when the temperature of the nitrogen in the supply mechanism is low enough to meet the cooling requirement of the lower valve box, the valves on the pipelines connected with the vortex tube refrigerator and the condenser are closed.
The first conveying pipeline is provided with a flowmeter and an electric regulating valve; the electric regulating valve is arranged close to the supply mechanism; the electric regulating valve regulates the nitrogen gas inflow according to the temperature change of the lower valve box, so that the cold end medium temperature is regulated, and the instantaneous flow is transmitted to the central control picture through the flowmeter to be displayed.
In the step (5), if the lower valve box is cooled to meet the set requirement, the vortex tube refrigerator needs to be quitted from use, and the steps to be performed are that the control ball valve on the third branch pipeline is opened first, and then the control ball valves on the first branch pipeline and the second branch pipeline are closed.
The invention has the advantages that:
the invention discloses a cooling system for a lower valve box of a blast furnace, which is characterized in that a vortex tube refrigerator and a condenser are added in the traditional cooling system for the lower valve box of the blast furnace, and the nitrogen cooling efficiency of the valve box is optimized under the condition of keeping a part of pipeline structures; the purposes of energy conservation and consumption reduction are realized.
Drawings
The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a schematic structural diagram of the present invention with a condensing mechanism added.
FIG. 3 shows a second embodiment of the present invention with a condensing mechanism.
The labels in the above figures are:
1. a supply means, 2, a cooling duct, 21, a first delivery duct, 22, a second delivery duct, 3, a bridging duct, 31, a first branch duct, 32, a second branch duct, 33, a third branch duct; 4. the device comprises a corrugated pipe, 5, a hot gas diffusion pipe, 6, a vortex tube refrigerator, 7, an electric regulating valve, 8, a flowmeter, 9, a condenser, 10 and a metal hose.
Detailed Description
The following description of preferred embodiments of the invention will be made in further detail with reference to the accompanying drawings.
A cooling system for a lower valve box of a blast furnace comprises a supply mechanism 1, wherein the supply mechanism 1 is connected with the lower valve box through a pipeline mechanism; the pipeline mechanism comprises a cooling pipeline 2 and a vortex tube refrigerator 6; the supply mechanism 1 is connected with a vortex tube refrigerator 6 through a cooling pipeline 2, and the vortex tube refrigerator 6 is connected with a lower valve box; the invention discloses a cooling system for a lower valve box of a blast furnace, which is characterized in that a vortex tube refrigerator 6, a condenser 9 and a related temperature and pressure measuring element are added in the cooling system for the lower valve box of the blast furnace, so that the nitrogen cooling efficiency of the valve box is optimized under the condition of keeping a part of pipeline structures; the purposes of energy conservation and consumption reduction are realized; the supply mechanism is mainly a gas supply means, and may be a nitrogen tank, or may be the gaseous nitrogen supply mechanism 1, and may be specifically provided as needed.
The method specifically comprises the following steps:
the original lower valve box nitrogen cooling pipeline 2 is modified, a vortex tube refrigerator 6 which has a simple structure, relatively small modification workload, almost zero maintenance and adjustable temperature and can continuously provide a cooling medium with lower temperature is implanted, the highest 50 ℃ or even higher initial temperature of the cooling medium in high-temperature seasons in summer can be reduced to below 15 ℃ by utilizing the coordination of a vortex tube cooling technology and a condenser under the condition of ensuring that the pressure of low-pressure nitrogen is not less than 0.6MPa, the nitrogen cooling efficiency of the lower valve box can be improved to a great extent, the purposes of energy conservation and consumption reduction are achieved, and the predicted nitrogen usage can be reduced to 700-1000 m3/h or even lower usage.
The cooling principle of the vortex tube is as follows:
vortex tubes (Vortex tubes) are also known as Vortex tubes, Vortex refrigerators, and the like. A medium gas (taking compressed air as an example) with a certain pressure is input into a vortex tube vortex generator, then expanded and accelerated and then rotated, the gas flow enters the interior of a heat tube along the wall of the heat tube at the rotating speed of 1,000,000rpm, the gas in the heat tube generates energy conversion after passing through vortex exchange, the gas flow is divided into two gas flows of cold and hot, at the terminal end of the heat tube, a part of the medium gas passes through a regulating valve (for convenience of regulation, a knob type temperature control regulating valve is installed at a hot end outlet of a vortex tube refrigerator 6, when the opening degree of the regulating valve is increased, the temperature of the hot gas at the hot end outlet is increased, according to the law of energy conservation, the temperature of cold gas at the cold end outlet is synchronously decreased at the moment, similarly, when the opening degree of the regulating valve is decreased, the temperature of the hot gas at the hot end outlet is synchronously increased, the temperature of the cold gas at the cold end outlet is discharged in a hot nitrogen mode, and the rest of the medium gas returns through the center of the rotating gas flow entering the heat tube at a lower speed, the cold air flow passes through the center of the generator to form ultralow temperature cold air which is collected to the cold air end to be discharged. The lowest cold air temperature of the cold air flow ejected from the cold air end can reach-45 ℃ under the premise of drying gas at the temperature of 7Bar and 25 ℃, the maximum temperature reduction amplitude reaches-70 ℃, and the limit temperature of the hot air flow ejected from the other end can reach +180 ℃.
According to the relation between the relative flow Q/Qmax of the regulating valve and the relative opening L/Lmax and the pressure difference on the valve: Q/Qmax ═ f (L/Lmax) (dP1/dP) ^ (1/2), (relative flow Q/Qmax: the ratio of a certain opening flow Q and a full opening flow Qmax of the control valve; relative opening L/Lmax: the ratio of a certain opening stroke L and a full opening stroke Lmax of the control valve; differential pressure across the valve: the ratio of a certain opening pressure dP1 and a full opening pressure dP of the control valve.),
it can be seen that: the differential pressure is determined by a fluid channel formed by the valve opening (displacement L of the valve core), the smaller the opening, the smaller the relative stroke, the larger the differential pressure before and after the valve, namely the smaller the pressure after the valve; the larger the opening degree is, the larger the relative stroke is, and the smaller the differential pressure before and after the valve is, that is, the larger the pressure after the valve is. Namely: when the opening degree of the valve is changed, the flow rate of the working regulating valve is changed, and the pressure difference between the front and the rear of the valve is also changed, namely the pressure behind the valve is also changed.
According to the principle, in actual use, according to the conditions of environmental temperature, top temperature and the like, the temperature of cooling nitrogen of a valve box in a high-temperature season is remotely regulated within the range of 5-25 ℃ by pre-regulating a vortex tube with a temperature control device and regulating the opening of a regulating valve on a regulating pipeline, the generated medium flow and pressure change, so that the equipment operation requirements that the management temperature of a lower seal valve seat in the lower valve box is less than or equal to 130 ℃ and the working temperature is 110 +/-10 ℃ are met, and the purposes of saving energy, reducing consumption and operating economically on the premise of ensuring the safe operation of key equipment are finally achieved.
The cooling system disclosed by the invention has the main invention point that the vortex tube refrigeration technology is applied to the cooling system of the furnace top lower valve box, so that the cooling system has the advantages of simple structure, small modification amount of the traditional structure, low investment cost, strong safety, high reliability, convenience in operation and use, capability of timely regulating and controlling the temperature of cold air and the like.
Preferably, the cooling pipeline 2 in the present invention includes a first conveying pipeline 21 and a second conveying pipeline 22, the supply mechanism 1 is connected to the second conveying pipeline 22 through the first conveying pipeline 21, one end of the second conveying pipeline 22 is connected to the first conveying pipeline 21, and the other end is connected to the lower valve box; the first conveying pipeline 21 and the second conveying pipeline 22 are connected through a bridging pipeline 3; the bridge pipeline 3 is connected with a vortex tube refrigerator 6; the first conveying pipe 21 is mainly used for connecting with the supply mechanism 1 in the invention; the second conveying pipeline 22 is mainly used for being connected with the lower valve box, so that subsequent cooling gas can conveniently enter the lower valve box for cooling; in addition, in order to facilitate the arrangement of the vortex tube refrigerator 6, a bridging pipeline 3 is arranged between the first conveying pipeline 21 and the second conveying pipeline 22, and the bridging pipeline 3 is used for connecting the vortex tube refrigerator 6 in the cooling pipeline 2; the arrangement of the bridging pipeline 3 facilitates the arrangement of the vortex tube refrigerator 6 and the on-off of the subsequent whole cooling system and the routing control of cooling gas; in general, the present invention facilitates the supply of nitrogen gas by the arrangement of the first and second delivery pipes 21 and 22, thereby facilitating the cooling operation of the lower valve box.
Preferably, the second conveying pipeline 22 is formed by splicing a plurality of single pipelines 222, and the arrangement facilitates the connection and installation of the cooling system and the lower valve box and also facilitates the disassembly and assembly of the whole cooling system.
Preferably, the bridging conduit 3 in the present invention includes a first branch conduit 31 and a second branch conduit 32; one end of the first branch pipeline 31 is connected with the first conveying pipeline 21, the other end of the first branch pipeline is connected with the medium inlet end of the vortex tube refrigerator 6, one end of the second branch pipeline 32 is connected with the cold air outlet end of the vortex tube refrigerator 6, and the other end of the second branch pipeline is connected with the second conveying pipeline 22; in the invention, the first branch pipeline 31 is mainly used for connecting the first conveying pipeline 21 with the vortex tube refrigerator 6, the second branch pipeline 32 is mainly used for simply connecting the second conveying pipeline 22 with the vortex tube refrigerator 6, the first branch pipeline 31 can be used for air inlet operation of the vortex tube refrigerator 6, and the second branch pipeline 32 is mainly used for conveying cooling gas generated by the vortex tube refrigerator 6 into the second conveying pipeline 22, so that cooling operation of a lower valve box is finally realized.
Preferably, the bridging conduit 3 of the present invention further comprises a third branch conduit 33; one end of the third branch pipeline 33 is connected with the first conveying pipeline 21, and the other end is connected with the second branch pipeline 32; the third branch pipeline 33 is arranged, one function is to communicate the first conveying pipeline 21 and the second conveying pipeline 22, and the second function is to improve the air inflow of nitrogen into the lower valve box; in addition, the third branch pipeline 33 can ensure that the whole cooling system can normally realize nitrogen supply to the lower valve box even if the vortex tube refrigerator 6 is separated from the cooling system; in specific arrangement, the third branch pipe 33 is arranged in parallel with the first branch pipe 31, and the third branch pipe 33 and the first branch pipe 31 and the second branch pipe 32 are actually arranged in a parallel circuit structure similar to the circuit structure; such an arrangement can facilitate the arrangement of the vortex tube refrigerator 6 and the subsequent matching of the control ball valve 34 to realize the nitrogen trend in the whole cooling system.
Preferably, in the present invention, the first branch pipe 31, the second branch pipe 32 and the third branch pipe 33 are all provided with a control ball valve 34; the arrangement of the control ball valve 34 can realize the trend and the supply quantity of nitrogen in the cooling system by controlling the on-off of the corresponding pipeline; it is to be noted here that, in the present invention, the control ball valve 34 on the second branch conduit 32 is arranged in the region between the vortex tube refrigerator 6 and the junction of the third branch conduit 33 and the second branch conduit 32; reference may be made in detail to the accompanying drawings; the purpose of such setting is to make the control ball valve 34 completely control the on-off of the second branch pipe 32, and avoid the problem that the control ball valve 34 of the second branch pipe 32 is arranged between the third branch pipe 33 and the second branch pipe 32 connected between the second delivery pipes 22, so that nitrogen passing through the third branch pipe 33 enters the vortex tube cooling valve, and cannot be cooled.
Preferably, the hot gas outlet end of the vortex tube refrigerator 6 is connected with a hot gas diffusion tube 5; the hot gas diffusion pipe 5 can discharge hot gas in the vortex tube refrigerator 6, a more optimized technical scheme can be that a heat recovery device is connected to the end part of the hot gas diffusion pipe 5, the specific structure can be set according to requirements, and meanwhile, a hot gas diffusion valve 51 is arranged on the hot gas diffusion pipe 5; the hot gas bleeding valve 51 can control the on-off of the hot gas bleeding pipe 5, so that the condition that the outside air enters the vortex tube refrigerator 6 through the hot gas bleeding valve 51 when the vortex tube refrigerator 6 is not used is avoided.
Preferably, the hot gas diffusing pipe 5 is connected with a condensing mechanism, the condensing mechanism comprises a condenser 9, a gas inlet end of the condenser 9 is connected with the hot gas diffusing pipe 5, a gas outlet end of the condenser 9 is connected with the second branch pipeline 32 through a fourth branch pipeline 91, the condensing mechanism is arranged in the heat pump, and is used for cooling a medium in the hot gas diffusing pipe 5, the cooled medium enters the second branch pipeline 32 through the fourth branch pipeline 91, and the medium entering the second branch pipeline 32 from the fourth branch pipeline 91 is mixed with the medium in the second branch pipeline 32; after mixing, the medium entering the second branch pipe 32 into the second delivery pipe 22 is at a suitable temperature, and the super-cooled medium is prevented from entering the lower valve box.
The condenser 9 of the invention belongs to a known device, the condenser 9 comprises a condenser body, the condenser body is provided with a gas inlet end and a gas outlet end, the gas inlet end is connected with the gas outlet end through a first pipeline, and the condenser body is also provided with a water liquid inlet end and a water liquid outlet end; the condenser 9 disclosed by the invention adopts double-tube-pass flow, the cold medium absorbs the waste heat discharged by the heat medium in the double-tube-pass flow process and is discharged from the water outlet, so that the working medium keeps the rated working temperature, the condenser 9 is arranged to realize the cooling operation of the hot gas discharged by the vortex tube refrigerator 6 by adopting heat exchange, and based on the principle, when the condenser 9 is arranged in a cooling system and the condenser 9 is connected with the hot gas discharge tube 5, the hot gas discharge tube 5 can be cooled after entering the condenser 9.
In addition, the invention can solve the potential safety hazards of zero discharge of high-temperature nitrogen at the hot end of the vortex tube refrigerator 6 and high-temperature scalding through the arrangement of the condensation mechanism, further realize the economic operation requirement of energy conservation and efficiency improvement, cool the hot end gas of the vortex tube refrigerator 6 by adding the water condenser 9, and obtain mixed nitrogen with suitable temperature after being mixed with the cold end gas of the vortex tube refrigerator 6 for cooling the lower valve box and the inner lower sealed valve seat thereof, thereby realizing energy conservation and emission reduction, eliminating the potential safety hazards of high-temperature scalding and simultaneously ensuring that the cooling system meets the operation requirements of safety, economy and environmental protection.
Preferably, in the present invention, a corrugated pipe 4 is disposed at one end of the second conveying pipeline 22 close to the first conveying pipeline 21, and the first conveying pipeline 21 is connected to the second conveying pipeline 22 through the corrugated pipe 4; the use of a bellows 4; the corrugated pipe 4 can play a bridging role, so that the first conveying pipeline 21 and the second conveying pipeline 22 can be conveniently connected, in addition, the corrugated pipe 4 has certain deformation capacity due to the structure of the corrugated pipe 4, the arrangement of a pipeline mechanism is more convenient, meanwhile, the corrugated pipe 4 has a good buffering effect, the pipeline stress can be eliminated, and the pipeline structure is prevented from being damaged due to the impact of air flow; based on the same principle, the metal hose 10 is arranged on the second branch pipe 32, the metal hose 10 is also arranged for eliminating pipe stress and reducing airflow impact force, in addition, because the metal hose 10 has certain deformation capacity, when the fourth branch pipe 91 is mixed with cooling air in the second branch pipe 32, the metal hose 10 expands, so that the impact force applied to the second branch pipe 32 can be reduced, and meanwhile, the expanded metal hose 10 can slow down the flow velocity of the air and ensure the uniformity of mixing of the air at different temperatures.
Furthermore, the arrangement positions and the number of the bellows 4 in the present invention can be set according to the needs, for example, the arrangement positions and the number of the bellows 4 can be set on the first branch pipe 31, the third branch pipe 33 and the fourth branch pipe 91, and the arrangement positions and the number of the bellows can be selected according to the needs because the arrangement of the bellows 4 can provide a good protection effect.
In addition, in the present invention, a first control valve 211 is provided on the first delivery pipe 21, and a second control valve 221 is provided on the second delivery pipe 22; the arrangement of the first control valve 211 and the second control valve 221 can well control the nitrogen flow of the whole cooling system, so that the adjustment of the cooling capacity of the cooling system can be better realized; and meanwhile, the control ball valve 34 is matched to facilitate the whole offline of the vortex tube refrigerator and the water condenser, and the subsequent disassembly and replacement are convenient.
A use method of a cooling system for a lower valve box of a blast furnace comprises the following steps:
step 1: assembling a cooling system, wherein the supply mechanism 1 is connected with a lower valve box through a pipeline mechanism; connecting the medium inlet end of the vortex tube refrigerator 6 with the first branch pipeline 31; connecting the cold air outlet end of the vortex tube refrigerator 6 with the second branch pipeline 32; connecting a hot gas outlet end of the vortex tube refrigerator 6 with a hot gas diffusion pipeline; connecting a hot gas diffusion pipeline 5 with a gas inlet end of a condenser 9; the gas outlet end of the condenser 9 is connected to a second branch conduit 32; the second branch pipe 32 is connected to the second delivery pipe 22 via the bellows 4; connecting the water inlet and outlet ends of the condenser 9 with corresponding pipelines;
step 2: after the step 1 is finished, fixing the vortex tube refrigerator 6, the condenser 9 and each pipeline structure by a set bracket or a support according to the specification;
and step 3: after the step 2 is finished, when the lower valve box is cooled, a control valve at the water inlet and outlet end of the condenser 9 is opened; opening the second control valve and the hot gas bleed valve 51; simultaneously closing the control ball valve 34 on the third branch pipeline 33, and opening the control ball valves 34 on the first branch pipeline 31 and the second branch pipeline 32, so that the vortex tube refrigerator 6 is connected into the lower valve box refrigeration pipeline; additionally, the valves on the first conveying pipeline 21 are opened according to requirements;
and 4, step 4: after the step 3 is finished, a mechanical temperature control valve arranged at the hot gas outlet end of the vortex tube refrigerator 6 is opened, and the opening degree of the mechanical temperature control valve is adjusted to ensure that the temperature of the hot gas outlet end is proper, namely the temperature of a cold gas outlet of the vortex tube refrigerator is proper, so that the lower valve box is cooled;
and 5: when the temperature of the nitrogen in the supply mechanism is low enough to meet the cooling requirement of the lower valve box, the valves on the pipelines connecting the vortex tube refrigerator 6 and the condenser 9 are closed.
On the premise of keeping the original process design, the use method disclosed by the invention adds the vortex tube refrigerator 6 in the traditional cooling system of the lower valve box of the blast furnace, and optimizes the nitrogen cooling efficiency of the valve box under the condition of keeping partial pipeline structure; the purposes of energy conservation and consumption reduction are realized.
In addition, in the present invention, it is preferable that the first transportation pipe 21 is provided with a flow meter 8 and an electric control valve 7; the electric regulating valve 7 is arranged close to the feeding mechanism 1; the electric regulating valve 7 regulates the nitrogen gas inflow according to the temperature change of the lower valve box, so that the temperature of a cold end medium is regulated, and the instantaneous flow is transmitted to a central control picture through the flowmeter 8 to be displayed; the regulating function of each valve body on medium flow and pressure is organically combined with the presetting function of the vortex tube with the temperature control device, so that remote and accurate regulation and control are realized, and the nitrogen cooling efficiency of the lower valve box is effectively improved.
Preferably, in step (5) of the present invention, if the lower valve box is cooled to meet the set requirement, the vortex tube refrigerator 6 needs to be removed from service, and the steps to be performed are to open the control ball valve 34 on the third branch pipe 33, and then close the control ball valves 34 on the first branch pipe 31 and the second branch pipe 32; due to the arrangement, the continuous supply of nitrogen to the lower valve box by the supply mechanism 1 can be well ensured, and the phenomenon that the continuous nitrogen supply operation of the lower valve box is influenced because the third branch pipeline 33 is not inserted when the vortex tube refrigerator 6 is removed for use is avoided; meanwhile, in order to avoid resource waste, in addition to the steps, the invention also requires that a temperature control regulating valve on the vortex tube refrigerator and a hot gas bleeding valve on the hot gas bleeding pipe are closed when the first branch pipeline and the second branch pipeline are closed; and simultaneously, a pipeline valve for water inlet and outlet on the condenser is also closed.
Based on the structure disclosed above; the specific embodiment of the invention is as follows:
the first embodiment:
the specific use method is as follows:
a branch pipeline is added in front of the corrugated pipe 4; connecting a medium inlet of a vortex tube refrigerator 6 with a first branch pipeline 31, and connecting one end of a cold air outlet of the vortex tube refrigerator 6 with a second branch pipeline 32; connecting the hot gas outlet end of the vortex tube refrigerator 6 with a hot gas diffusion tube 5, wherein the hot gas diffusion tube 5 is made of a phi 108 or phi 80 carbon steel pipeline; a bleeding valve 51 is arranged on the hot gas bleeding pipe 5, and the length of the hot gas bleeding pipe 5 is customized according to the field installation requirement; fixing the vortex tube refrigerator 6 and the hot gas diffusion tube 5 by using a proper bracket according to the specification; because the temperature of the exhaust gas at the end part of the hot gas diffusing pipe 5 can be up to more than 100 ℃, the diffusing pipe can be subjected to heat preservation treatment as appropriate; gas or heat recovery and reuse means may be provided at the end if necessary.
The specific implementation process comprises the following steps: opening the second control valve on the second delivery pipe 22 and the bleed valve 51 on the hot gas bleed line 5; closing the control ball valve 34 on the third branch pipeline 33, then opening the control ball valves 34 on the first branch pipeline 31 and the second branch pipeline 32, so that the vortex tube refrigerator 6 is used in an intervention manner, and then opening the related valve structures such as the first control on the first conveying pipeline 21, in addition, opening the mechanical temperature control valve at the hot gas end of the vortex tube refrigerator 6 (here, the opening degree of the mechanical temperature control valve is required to be selected according to the actual requirement, namely, the mechanical temperature control valve is required to be opened to a proper opening degree when being opened, for example, one-fourth opening degree, three-fourth opening degree or full opening degree can be selected), adjusting the nitrogen gas inflow timely by using the adjusting valve arranged on the first conveying pipeline 21 according to the temperature change of the upper and lower sealing valve seats of the lower valve box, thereby adjusting the medium temperature of the cold end, and transmitting the instantaneous flow to a central control picture through the flowmeter 8 for display.
Second embodiment:
on the basis of reserving a cooling pipeline of the lower valve box of the first embodiment, a set of condensing mechanism is added, wherein the condensing mechanism is equivalent to hot gas cooling and recycling equipment externally discharged by a vortex tube refrigerator 6, specifically, the tail part of a hot gas discharge tube 5 is connected with a condenser 9, and a gas outlet end of the condenser 9 is connected with a second branch pipeline 32 through a fourth branch pipeline 91, and based on the arrangement, the vortex tube refrigerator 6 can be mixed with cooling gas externally discharged by the condenser 9, so that mixed nitrogen with a suitable temperature is obtained and sent to the lower valve box for cooling;
in actual use, according to conditions such as environment temperature, furnace top temperature and the like, the temperature of a cooling medium entering a lower valve box is remotely regulated within the range of 5-25 ℃ by pre-regulating a temperature control device (a temperature regulating valve) of a vortex tube refrigerator 6 and regulating the opening of an electric regulating valve 7 on a regulating pipeline, the generated medium flow and pressure change, so that the equipment operation requirements that the working temperature of a lower seal valve seat is 110 +/-10 ℃ within a annual range and the management temperature of the lower seal valve seat is less than or equal to 130 ℃ are met, and the purposes of energy conservation, consumption reduction and economic operation on the premise of ensuring the safe operation of key equipment are finally achieved.
When in specific use:
closing a control ball valve on a second branch pipeline 32, introducing nitrogen (the temperature of which changes along with the change of the ambient temperature) output by a nitrogen tank into the vortex tube refrigerator 6 through a first branch pipeline 31, and simultaneously introducing hot gas generated by the vortex tube refrigerator 6 into the condenser 9 through a hot gas diffusion pipe 5 (the problem of the hot gas generated by the vortex tube can be adjusted through a hot gas temperature adjusting valve, so that the temperature of the hot gas is in the range of 100 plus 110 ℃, and the temperature of the hot gas is specifically adjusted according to the cooling effect required actually); if the length of the hot gas diffusion pipe 5 is not enough, the tail part of the hot gas diffusion pipe 5 can be communicated with the condenser 9 through a pipeline structure such as a hard pipe and the like, and the selection can be specifically carried out according to the requirement; meanwhile, the water circulation in the condenser 9 is required to be started, and the water enters the condenser body through the water liquid inlet end of the condenser 9 when the temperature of the water supply system for cooling water is less than 33 ℃; thereby realizing the heat exchange between the cooling water and the hot nitrogen, and discharging the cooling water after heat exchange out of the condenser 9 through a water outlet end on the condenser 9; the gas outlet end of the condenser 9 is connected with the second branch pipeline 32 through a fourth branch pipeline 91, so that the cooled recovered nitrogen with the temperature of less than 36 ℃ is mixed with the cold nitrogen discharged from the cold gas outlet of the vortex tube with the temperature of-10-0 ℃ to obtain nitrogen with the temperature of 5-25 ℃, and the nitrogen is sent into the second conveying pipeline 22 through metal flexible connection (for eliminating pipeline stress), and finally sent into the lower valve box for cooling.
Meanwhile, remote temperature measuring points and pressure measuring points are arranged on pipelines connected with the vortex tube refrigerator 6 and the condenser 9 so as to be convenient to regulate and control.
The vortex tube refrigerator 6 is connected with a condenser 9 through a hot gas diffusing pipe 5, the condenser 9 has a heat exchange area which is not less than 20 square meters; the cooling water of the condenser 9 adopts high-pressure clean circulating water with the pressure of 1.0MPa and the temperature of less than 33 ℃; the return water of the condenser 9 is connected to a high-pressure clean circulating water return pipeline; according to actual use needs, the heat exchange area of the condenser 9 can be increased or decreased, and a plurality of condensers 9 can be connected in series and used in combination.
Hot gas with the temperature of about 100-110 ℃ discharged from the hot end of the vortex tube is input into the condenser 9, heat exchange is carried out by using the condenser 9, and hot water discharged from the condenser 9 enters a water return system, so that the temperature of the cooled gas is less than 35 ℃.
In addition, the cooling system disclosed by the invention can adjust the opening of each valve body according to the temperatures of the lower seal valve seat and the furnace top, so that the whole cooling system can more accurately cool the lower valve box.
The invention discloses the structure;
the invention has the following technical effects:
firstly, the invention combines the vortex tube refrigeration technology with the water condenser 9, and applies the technology to the cooling system of the blast furnace top lower valve box and the internal lower sealed valve seat thereof, has originality in the same type of blast furnace at home and abroad, and has universal applicability in the cooling system of the blast furnace top lower valve box and the internal lower sealed valve seat thereof which need to be cooled by medium and low pressure nitrogen.
In addition, the cooling system disclosed by the invention has the advantages of simple structure, small modification amount, low investment cost, strong safety, high reliability, simplicity and convenience in operation, timely regulation and control of the temperature of cold air and the like.
In addition, the cooling system disclosed by the invention recycles high-temperature nitrogen at the hot end of the vortex tube refrigerator 6, thereby effectively avoiding the potential safety hazard of high-temperature scalding and meeting the requirement of safe operation.
In addition, the cooling system disclosed by the invention greatly improves the nitrogen cooling effect and unnecessary waste of the lower valve box and the lower sealing valve seat inside the lower valve box, is more beneficial to controlling the nitrogen cost, has obvious economic benefit and also meets the environmental protection requirements of energy conservation and emission reduction.
It is clear that the specific implementation of the invention is not restricted to the above-described embodiments, but that various insubstantial modifications of the inventive process concept and technical solutions are within the scope of protection of the invention.
Claims (7)
1. The cooling system for the lower valve box of the blast furnace is characterized by comprising a supply mechanism, a cooling mechanism and a cooling mechanism, wherein the supply mechanism is connected with the lower valve box through a pipeline mechanism; the pipeline mechanism comprises a cooling pipeline and a vortex tube refrigerator; the supply mechanism is connected with a vortex tube refrigerator through a cooling pipeline, and the vortex tube refrigerator is connected with the lower valve box; the cooling pipeline comprises a first conveying pipeline and a second conveying pipeline, the supply mechanism is connected with the second conveying pipeline through the first conveying pipeline, one end of the second conveying pipeline is connected with the first conveying pipeline, and the other end of the second conveying pipeline is connected with the lower valve box; the first conveying pipeline and the second conveying pipeline are connected through a bridging pipeline; the bridge pipeline is connected with a vortex tube refrigerator; the bridging conduit comprises a first branch conduit and a second branch conduit; one end of the first branch pipeline is connected with the first conveying pipeline, the other end of the first branch pipeline is connected with a medium inlet end of the vortex tube refrigerator, one end of the second branch pipeline is connected with a cold air outlet end of the vortex tube refrigerator, and the other end of the second branch pipeline is connected with the second conveying pipeline; the bridging conduit further comprises a third branch conduit; and one end of the third branch pipeline is connected with the first conveying pipeline, and the other end of the third branch pipeline is connected with the second branch pipeline.
2. The cooling system for the lower valve box of the blast furnace as claimed in claim 1, wherein the first branch pipe, the second branch pipe and the third branch pipe are provided with control ball valves; and the control ball valve on the second branch pipeline is arranged in the area between the vortex tube refrigerator and the joint of the third branch pipeline and the second branch pipeline.
3. The cooling system for the lower valve box of the blast furnace as claimed in claim 1, wherein a hot gas discharge pipe is connected to a hot gas outlet end of the vortex tube refrigerator; and a hot gas diffusion valve is arranged on the hot gas diffusion pipe.
4. The cooling system of claim 3, wherein the hot gas discharging pipe is connected to a condensing mechanism, the condensing mechanism comprises a condenser, a gas inlet end of the condenser is connected to the hot gas discharging pipe, and a gas outlet end of the condenser is connected to the second branch pipe through a fourth branch pipe.
5. The use method of the cooling system for the lower valve box of the blast furnace according to any one of claims 1 to 4, comprising the steps of:
step 1: the cooling system is assembled, and the supply mechanism is connected with the lower valve box through the pipeline mechanism; connecting a medium inlet end of a vortex tube refrigerator with a first branch pipeline; connecting a cold air outlet end of the vortex tube refrigerator with a second branch pipeline; connecting a hot gas outlet end of the vortex tube refrigerator with a hot gas diffusion pipeline; the second branch pipeline is connected with a second conveying pipeline through a corrugated pipe;
step 2: after the step 1 is finished, fixing the vortex tube refrigerator and each pipeline structure by a set bracket or a support according to the specification;
and step 3: after the step 2 is finished, when the lower valve box is cooled, a second control valve and a hot gas bleeding valve on a second conveying pipeline are opened; simultaneously closing the control ball valve on the third branch pipeline, and opening the control ball valves on the first branch pipeline and the second branch pipeline to enable the vortex tube refrigerator to be connected into the lower valve box refrigeration pipeline; additionally opening a first control valve on the first delivery conduit;
and 4, step 4: after the step 3 is finished, a mechanical temperature control valve arranged at the hot gas outlet end of the vortex tube refrigerator is opened, and the opening degree of the mechanical temperature control valve is adjusted to enable the temperature of the hot gas outlet end to be proper, namely the temperature of a cold gas outlet of the vortex tube refrigerator to be proper, so that the lower valve box is cooled;
and 5: when the temperature of the nitrogen in the supply mechanism is low enough to meet the cooling requirement of the lower valve box, the valves on the pipelines connected with the vortex tube refrigerator and the condenser are closed.
6. The use method of the cooling system for the lower valve box of the blast furnace as claimed in claim 5, wherein the first conveying pipeline is provided with a flow meter and an electric control valve; the electric regulating valve is arranged close to the supply mechanism; the electric regulating valve regulates the nitrogen gas inflow according to the temperature change of the lower valve box, so that the cold end medium temperature is regulated, and the instantaneous flow is transmitted to the central control picture through the flowmeter to be displayed.
7. The use method of the cooling system for the lower valve box of the blast furnace as claimed in claim 5, wherein in the step 5, if the lower valve box is cooled to meet the set requirement, the vortex tube refrigerator needs to be removed from use, and the steps to be performed are to open the control ball valve on the third branch pipeline and then close the control ball valves on the first branch pipeline and the second branch pipeline.
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| CN202110362279.8A CN113088593B (en) | 2021-04-02 | 2021-04-02 | Cooling system for lower valve box of blast furnace and using method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53144465A (en) * | 1977-05-23 | 1978-12-15 | Mitsubishi Heavy Ind Ltd | Vortex tube |
| RU25508U1 (en) * | 2002-03-11 | 2002-10-10 | Открытое акционерное общество "Магнитогорский металлургический комбинат" | DEVICE FOR SUPPLYING DOMAIN GAS OF AN AIR BLAST OR POWER STEAM TURBINE INSTALLATION |
| CN105112582A (en) * | 2015-09-30 | 2015-12-02 | 开封中化换热设备有限公司 | Draught fan-free smelt blast furnace supplying oxygenized air and air separation energy saving system |
| CN207811782U (en) * | 2017-12-26 | 2018-09-04 | 常熟市龙腾特种钢有限公司 | A kind of furnace roof cooling device |
| CN214361478U (en) * | 2020-12-17 | 2021-10-08 | 中冶赛迪工程技术股份有限公司 | Cooling and heating device for blast furnace top equipment |
-
2021
- 2021-04-02 CN CN202110362279.8A patent/CN113088593B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53144465A (en) * | 1977-05-23 | 1978-12-15 | Mitsubishi Heavy Ind Ltd | Vortex tube |
| RU25508U1 (en) * | 2002-03-11 | 2002-10-10 | Открытое акционерное общество "Магнитогорский металлургический комбинат" | DEVICE FOR SUPPLYING DOMAIN GAS OF AN AIR BLAST OR POWER STEAM TURBINE INSTALLATION |
| CN105112582A (en) * | 2015-09-30 | 2015-12-02 | 开封中化换热设备有限公司 | Draught fan-free smelt blast furnace supplying oxygenized air and air separation energy saving system |
| CN207811782U (en) * | 2017-12-26 | 2018-09-04 | 常熟市龙腾特种钢有限公司 | A kind of furnace roof cooling device |
| CN214361478U (en) * | 2020-12-17 | 2021-10-08 | 中冶赛迪工程技术股份有限公司 | Cooling and heating device for blast furnace top equipment |
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| CN113088593A (en) | 2021-07-09 |
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