CN110925594A - Nitrogen vaporization system and method for improving vaporization rate of nitrogen vaporizer - Google Patents
Nitrogen vaporization system and method for improving vaporization rate of nitrogen vaporizer Download PDFInfo
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- CN110925594A CN110925594A CN201911070611.2A CN201911070611A CN110925594A CN 110925594 A CN110925594 A CN 110925594A CN 201911070611 A CN201911070611 A CN 201911070611A CN 110925594 A CN110925594 A CN 110925594A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
- F17C7/02—Discharging liquefied gases
- F17C7/04—Discharging liquefied gases with change of state, e.g. vaporisation
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
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- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
- F17C13/026—Special adaptations of indicating, measuring, or monitoring equipment having the temperature as the parameter
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/04—Arrangement or mounting of valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/01—Pure fluids
- F17C2221/014—Nitrogen
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
- F17C2223/0107—Single phase
- F17C2223/013—Single phase liquid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
- F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
- F17C2225/0107—Single phase
- F17C2225/0123—Single phase gaseous, e.g. CNG, GNC
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
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- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/04—Methods for emptying or filling
- F17C2227/041—Methods for emptying or filling vessel by vessel
- F17C2227/042—Methods for emptying or filling vessel by vessel with change-over from one vessel to another
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
- F17C2250/06—Controlling or regulating of parameters as output values
- F17C2250/0605—Parameters
- F17C2250/0631—Temperature
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- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2260/00—Purposes of gas storage and gas handling
- F17C2260/04—Reducing risks and environmental impact
- F17C2260/046—Enhancing energy recovery
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
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Abstract
The invention provides a nitrogen vaporization system for improving the vaporization rate of a nitrogen vaporizer, which comprises a nitrogen vaporization system, a nitrogen vaporizer and a cooling water circulation system, wherein the nitrogen vaporization system comprises a vaporizer and a cooling water circulation system; the cooling water circulation system comprises a cooling water tank, and the vaporizer is immersed in the cooling water tank; the water outlet of the cooling water tank is communicated with the cooling water inlet of the shaft furnace, and the water inlet of the cooling water tank is communicated with the cooling water outlet after heat exchange in the shaft furnace; the auxiliary vaporizer and the vaporizer are arranged in parallel, the inlets of the auxiliary vaporizer and the vaporizer are respectively connected with a liquid nitrogen conveying pipeline through valves, and the outlets of the auxiliary vaporizer and the vaporizer are respectively connected with a nitrogen conveying pipeline through valves. The problem that the exit end of vaporizer has the thin ice is avoided to this patent, has improved the vaporization rate and the life of vaporizer.
Description
Technical Field
The invention relates to the technical field of machinery, in particular to a nitrogen vaporizer.
Background
Shaft furnaces are devices for the thermal treatment of metals.
At present, nitrogen is continuously conveyed in a well type furnace and is generated after liquid nitrogen passes through a vaporizer, heat is continuously released during the work of the vaporizer, and the outlet end of the vaporizer has condensed water, so that if the vaporizer works for a long time, thin ice is deposited on the outlet end seriously, the working effect of the vaporizer is influenced, and the vaporization rate is influenced.
The working components such as the motor in the shaft furnace need to convey cooling water, and the cooling water is usually generated by a cooling tower. The cooling tower needs electricity and consumes more energy.
The existing vaporizer and cooling tower work independently, which easily causes energy waste, and at present, no device for combining the vaporizer and a cooling water circulation system exists.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a nitrogen vaporization system for improving the vaporization rate of a nitrogen vaporizer, which aims to solve the technical problem that the vaporization effect is influenced by the fact that thin ice is easy to form at the outlet end of the existing vaporizer.
The invention also provides a method for improving the vaporization rate of the nitrogen vaporizer, which aims to solve the technical problem that the vaporization effect is influenced by the fact that thin ice is easy to form at the outlet end of the existing vaporizer.
The technical scheme of the invention is as follows: a nitrogen gas vaporization system for improving the vaporization rate of a nitrogen gas vaporizer comprises a nitrogen gas vaporization system, wherein the nitrogen gas vaporization system comprises a liquid nitrogen conveying pipeline, a vaporizer and a nitrogen gas conveying pipeline which are sequentially connected along a flow guide direction;
the water outlet of the cooling water tank is communicated with the cooling water inlet of the pit furnace;
the hot water circulating system is used for preventing the surface of the cooling water tank from being frozen and comprises a hot water tank;
the outlet of the hot water tank is communicated with the inlet of the cooling water tank through a circulating water pump, and the inlet of the hot water tank is communicated with the cooling water tank through a circulating pipeline;
a water inlet of the hot water tank or the cooling water tank is in butt joint conduction with a cooling water outlet after heat exchange in the shaft furnace;
temperature sensors are arranged in the hot water tank and the cooling water tank.
The problem that the exit end of vaporizer has the thin ice is avoided to this patent, has improved the vaporization rate and the life of vaporizer.
This patent direct replacement need not the cooling tower, through direct with the direct submergence of vaporizer in coolant tank, through the cooling of the interior water of liquid nitrogen vaporization heat absorption realization coolant tank, realizes the supply of the part cooling water of pit furnace, simultaneously, through the setting of hot-water tank, has avoided the problem of the interior low temperature of coolant tank, simultaneously, has avoided traditional exit end to have the problem that thin ice influences the work effect of vaporizer.
When the temperature in the cooling water tank is lower than 15 ℃, the hot water tank is led into the water body to the cooling water tank inner loop, and the problem that the surface is frozen due to the fact that the temperature in the cooling water tank is too low is avoided. And when the temperature in the cooling water tank is higher than 40 ℃, the hot water tank stops supplying water into the cooling water tank.
Further preferably, the hot water tank and the circulating water pump are sequentially connected between the water inlet of the cooling water tank and the cooling water outlet of the pit furnace.
The synchronous driving of the two water bodies of the circulating pipeline and the cooling water outlet of the pit furnace is realized conveniently by a single circulating water pump.
Further preferably, the system further comprises an auxiliary vaporizer, the auxiliary vaporizer and the vaporizer are arranged in parallel, inlets of the auxiliary vaporizer and the vaporizer are respectively connected with the liquid nitrogen conveying pipeline through valves, and outlets of the auxiliary vaporizer and the vaporizer are respectively connected with the nitrogen conveying pipeline through valves.
Through the arrangement of the auxiliary vaporizer, the problem that the water surface of the cooling water tank is frozen in the heat absorption process of the vaporizer is avoided. When the temperature in the cooling water tank is lower than a set value (such as 10 ℃) or the vaporizer works for a certain time (such as 4 hours), the vaporization capacity of the vaporizer is reduced, liquid nitrogen is not conveyed into the vaporizer, the auxiliary vaporizer works, and the liquid nitrogen is used for generating nitrogen through the auxiliary vaporizer. After working for about 2 hours, the liquid nitrogen is switched back to the vaporizer to continue to absorb heat by vaporization of the liquid nitrogen.
Further preferably, the auxiliary vaporizer is installed above the cooling water tank.
The auxiliary vaporizer can be used for condensing water in the air into condensed water and directly dripping the condensed water into the cooling water tank, so that the occupied area can be conveniently controlled, and the water can be collected.
Further preferably, a bracket for supporting and fixing the auxiliary vaporizer is mounted on a side wall of the cooling water tank.
The installation of the auxiliary carburetor is convenient.
The method for improving the vaporization rate of the nitrogen vaporizer is characterized by comprising a nitrogen vaporization system, wherein the nitrogen vaporization system comprises a liquid nitrogen conveying pipeline, the vaporizer and a nitrogen conveying pipeline which are sequentially connected along a flow guide direction;
the evaporator also comprises a cooling water circulation system, wherein the cooling water circulation system comprises a cooling water tank, and the evaporator is immersed in the cooling water tank;
the water outlet of the cooling water tank is communicated with the cooling water inlet of the pit furnace;
the hot water circulating system is used for preventing the surface of the cooling water tank from being frozen and comprises a hot water tank;
the outlet of the hot water tank is communicated with the inlet of the cooling water tank through a circulating water pump, and the inlet of the hot water tank is communicated with the cooling water tank through a circulating pipeline;
a water inlet of the hot water tank is in butt joint conduction with a cooling water outlet after heat exchange in the well type furnace;
temperature sensors are arranged in the hot water tank and the cooling water tank;
the auxiliary vaporizer is connected with the vaporizer in parallel, the inlets of the auxiliary vaporizer and the vaporizer are respectively connected with the liquid nitrogen conveying pipeline through valves, and the outlets of the auxiliary vaporizer and the vaporizer are respectively connected with the nitrogen conveying pipeline through valves;
in the initial working state, the vaporizer works, the cooling water tank cools down, when the temperature of the cooling water tank is lower than 15 ℃, the vaporizer works in an auxiliary mode, the vaporizer does not work, at the moment, the circulating water pump leads the water body in the hot water tank into the cooling water tank in a circulating mode, and the temperature in the cooling water tank is adjusted;
when the temperature in the cooling water tank exceeds 40 degrees, the vaporizer works, the auxiliary vaporizer does not work, and the circulating water pump stops circularly guiding the water in the hot water tank into the cooling water tank.
When the vaporizer works, the inlet of the vaporizer is communicated with the liquid nitrogen conveying pipeline, and the outlet of the vaporizer is communicated with the nitrogen conveying pipeline;
when the vaporizer does not work, the inlet of the vaporizer is not communicated with the liquid nitrogen conveying pipeline, and the outlet of the vaporizer is not communicated with the nitrogen conveying pipeline;
when the auxiliary vaporizer works, the inlet of the auxiliary vaporizer is communicated with the liquid nitrogen conveying pipeline, and the outlet of the auxiliary vaporizer is connected with the nitrogen conveying pipeline for communication;
when the auxiliary vaporizer does not work, the inlet of the auxiliary vaporizer is not communicated with the liquid nitrogen conveying pipeline, and the outlet of the auxiliary vaporizer is connected with the nitrogen conveying pipeline and is not communicated.
Further preferably, the temperature sensors in the hot water tank and the cooling water tank are connected with a control system;
all the valves are electromagnetic valves, the control system is in control connection with the electromagnetic valves and the circulating pump, and the control system controls the opening and closing of the valves according to the conditions detected by the temperature sensor so as to control the working conditions of the vaporizer and the auxiliary vaporizer;
the control system is also connected with a timer and a memory, and the memory records the working condition information of the vaporizer and the working condition information of the auxiliary vaporizer;
the working condition information of the vaporizer comprises the starting time, the stopping time, the single working time and the total working time of each vaporizer working;
the operating condition information of the auxiliary vaporizer includes a start time, a stop time, a single operation period, and a total operation period for each operation of the vaporizer.
Drawings
FIG. 1 is a schematic structural diagram of embodiment 1 of the present invention;
FIG. 2 is another schematic structural diagram of embodiment 1 of the present invention;
fig. 3 is a schematic structural diagram of embodiment 2 of the present invention.
In the figure: 1 is an auxiliary vaporizer, 2 is a vaporizer, 3 is a shaft furnace, 4 is a cooling water tank, 5 is a circulating water pump, and 6 is a hot water tank.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
In specific embodiment 1, referring to fig. 1 and 2, a nitrogen vaporization system for increasing the vaporization rate of a nitrogen vaporizer includes a nitrogen vaporization system, the nitrogen vaporization system includes a liquid nitrogen delivery pipeline, a vaporizer 2, and a nitrogen delivery pipeline sequentially connected along a flow guide direction, and further includes a cooling water circulation system, the cooling water circulation system includes a cooling water tank 4, and the vaporizer 2 is immersed in the cooling water tank 4; the water outlet of the cooling water tank 4 is communicated with the cooling water inlet of the pit furnace 3; the device also comprises a hot water circulating system for preventing the surface of the cooling water tank 4 from being frozen, wherein the hot water circulating system comprises a hot water tank 6; the outlet of the hot water tank 6 is communicated with the inlet of the cooling water tank 4 through the circulating water pump 5, and the inlet of the hot water tank 6 is communicated with the cooling water tank 4 through a circulating pipeline; a water inlet of the hot water tank 6 or the cooling water tank 4 is in butt joint conduction with a cooling water outlet after heat exchange in the shaft furnace 3 (see the flow guide modes of the hot water tank and the cooling water tank respectively in fig. 1 and fig. 2); temperature sensors are installed in the hot water tank 6 and the cooling water tank 4. This patent direct replacement need not the cooling tower, through directly with the direct submergence of vaporizer 2 in cooling water tank 4, realizes the cooling of water in cooling water tank 4 through liquid nitrogen vaporization heat absorption, realizes the supply of well furnace 3's part cooling water, simultaneously, through the setting of hot-water tank 6, has avoided the problem of the interior low temperature of cooling water tank 4. When the temperature in the cooling water tank 4 is lower than 15 ℃, the hot water tank 6 is led into the water body to the internal circulation of the cooling water tank 4, so that the problem that the surface is frozen due to the over-low temperature in the cooling water tank 4 is avoided. When the temperature in the cooling water tank 4 is higher than 40 degrees celsius, the hot water tank 6 stops supplying water into the cooling water tank 4.
Referring to fig. 1, a hot water tank 6 and a circulating water pump 5 are sequentially connected between the water inlet of the cooling water tank 4 and the cooling water outlet of the shaft furnace 3. The single circulating water pump 5 is convenient to realize, and the synchronous driving of the circulating pipeline and the two water bodies at the cooling water outlet of the pit furnace 3 is realized.
Of course, referring to fig. 2, the water inlet of the cooling water tank 4 is in butt joint with the cooling water outlet after heat exchange in the shaft furnace 3.
The working principle is as follows: under the initial operating condition, vaporizer 2 works, and cooling water tank 4 cools down, and when cooling water tank 4 temperature was less than 15 ℃, circulating water pump 5 was with the leading-in cooling water tank 4 of the water circulation in the hot-water tank 6, realized the adjustment of the temperature in cooling water tank 4. When the temperature in the cooling water tank 4 exceeds 40 °, the circulation water pump 5 stops circulating the water in the hot water tank 6 into the cooling water tank 4.
In specific embodiment 2, referring to fig. 3, based on the specific embodiment 1, the system further includes an auxiliary vaporizer 1, the auxiliary vaporizer 1 and the vaporizer 2 are arranged in parallel, inlets of the auxiliary vaporizer 1 and the vaporizer 2 are respectively connected to the liquid nitrogen delivery pipeline through valves, and outlets of the auxiliary vaporizer 1 and the vaporizer 2 are respectively connected to the nitrogen delivery pipeline through valves. The auxiliary vaporizer 1 is arranged, so that the problem that the water surface of the cooling water tank 4 is frozen in the heat absorption process of the vaporizer 2 is avoided. When the temperature in the cooling water tank 4 is lower than a set value (such as 10 ℃) or the vaporizer 2 operates for a certain time (such as 4 hours), the vaporization capacity of the vaporizer 2 is reduced, liquid nitrogen is not conveyed into the vaporizer 2, the auxiliary vaporizer 1 operates, and the liquid nitrogen is used for generating nitrogen through the auxiliary vaporizer 1. After working for about 2 hours, the liquid nitrogen is switched back to the vaporizer 2 to continue to absorb heat by vaporization of the liquid nitrogen.
The auxiliary vaporizer 1 is installed above the cooling water tank 4. The floor area is convenient to control, and meanwhile, the condensed water condensed from the moisture in the air by the outlet of the auxiliary vaporizer 1 can directly drop into the cooling water tank 4, so that the water is collected. A bracket for supporting and fixing the auxiliary vaporizer 1 is installed on the side wall of the cooling water tank 4. Facilitating the installation of the auxiliary carburettor 1.
The work of the vaporizer 2 and the auxiliary vaporizer 1 is switched, and the control of the flow guide direction is realized through a valve, so that the work of the vaporizer and the auxiliary vaporizer is switched.
The working principle is as follows: under the initial operating condition, vaporizer 2 works, and cooling water tank 4 cools down, and when cooling water tank 4 temperature was less than 15 ℃, supplementary vaporizer 1 worked, and vaporizer 2 is out of work, and at this moment, circulating water pump 5 is with leading-in cooling water tank 4 of the water circulation in the hot-water tank 6, realizes the adjustment of the temperature in cooling water tank 4. When the temperature in the cooling water tank 4 exceeds 40 degrees, the vaporizer 2 is operated, the auxiliary vaporizer 1 is not operated, and the circulating water pump 5 stops circularly guiding the water in the hot water tank 6 into the cooling water tank 4.
The method for improving the vaporization rate of the nitrogen vaporizer comprises a nitrogen vaporization system, wherein the nitrogen vaporization system comprises a liquid nitrogen conveying pipeline, a vaporizer and a nitrogen conveying pipeline which are sequentially connected along a flow guide direction; the water outlet of the cooling water tank is communicated with the cooling water inlet of the pit furnace;
the hot water circulating system is used for preventing the surface of the cooling water tank from being frozen and comprises a hot water tank;
the outlet of the hot water tank is communicated with the inlet of the cooling water tank through a circulating water pump, and the inlet of the hot water tank is communicated with the cooling water tank through a circulating pipeline; the water inlet of the hot water tank is in butt joint conduction with the cooling water outlet after heat exchange in the well type furnace; temperature sensors are arranged in the hot water tank and the cooling water tank;
the auxiliary vaporizer and the vaporizer are arranged in parallel, the inlets of the auxiliary vaporizer and the vaporizer are respectively connected with a liquid nitrogen conveying pipeline through valves, and the outlets of the auxiliary vaporizer and the vaporizer are respectively connected with a nitrogen conveying pipeline through valves;
in the initial working state, the vaporizer works, the cooling water tank cools down, when the temperature of the cooling water tank is lower than 15 ℃, the vaporizer works in an auxiliary mode, the vaporizer does not work, at the moment, the circulating water pump leads the water body in the hot water tank into the cooling water tank in a circulating mode, and the temperature in the cooling water tank is adjusted;
when the temperature in the cooling water tank exceeds 40 degrees, the vaporizer works, the auxiliary vaporizer does not work, and the circulating water pump stops circularly guiding the water in the hot water tank into the cooling water tank.
By adopting the structure of the device, the gasification rate is improved by 40 percent, the vaporizer and the auxiliary vaporizer are switched once in 2 hours, and the vaporizer is switched into the auxiliary vaporizer after being immersed in the cooling water tank for 6 to 8 hours. When the amount of nitrogen gas used is small, for example, nitrogen gas supply to three or less shaft furnaces is not required to be switched to an auxiliary vaporizer.
When the vaporizer works, a valve at the inlet of the vaporizer is opened and communicated with the liquid nitrogen conveying pipeline, and a valve at the outlet of the vaporizer is opened and communicated with the nitrogen conveying pipeline.
When the vaporizer does not work, the valve of the inlet of the vaporizer is closed, the inlet of the vaporizer is not communicated with the liquid nitrogen conveying pipeline, the valve of the outlet of the vaporizer is closed, and the outlet of the vaporizer is not communicated with the nitrogen conveying pipeline.
When the auxiliary vaporizer works, a valve at the inlet of the auxiliary vaporizer is opened, the inlet of the auxiliary vaporizer is communicated with the liquid nitrogen conveying pipeline, a valve at the outlet of the auxiliary vaporizer is opened, and the outlet of the auxiliary vaporizer is connected with the nitrogen conveying pipeline for communication.
When the auxiliary vaporizer does not work, the valve of the inlet of the auxiliary vaporizer is closed, the inlet of the auxiliary vaporizer is not communicated with the liquid nitrogen conveying pipeline, the valve of the outlet of the auxiliary vaporizer is closed, and the outlet of the auxiliary vaporizer is connected with the nitrogen conveying pipeline and is not communicated.
The temperature sensors in the hot water tank and the cooling water tank are connected with a control system; all the valves are electromagnetic valves, the control system is in control connection with the electromagnetic valves and the circulating pump, and the control system controls the opening and closing of the valves according to the conditions detected by the temperature sensor so as to control the working conditions of the vaporizer and the auxiliary vaporizer; the control system is also connected with a timer and a memory, and the memory records the working condition information of the vaporizer and the working condition information of the auxiliary vaporizer; the working condition information of the vaporizer comprises the starting time, the stopping time, the single working time and the total working time of each vaporizer working; the operating condition information of the auxiliary vaporizer includes a start time, a stop time, a single operation period, and a total operation period for each operation of the vaporizer.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.
Claims (7)
1. A nitrogen gas vaporization system for improving the vaporization rate of a nitrogen gas vaporizer comprises a nitrogen gas vaporization system, wherein the nitrogen gas vaporization system comprises a liquid nitrogen conveying pipeline, a vaporizer and a nitrogen gas conveying pipeline which are sequentially connected along a flow guide direction;
the water outlet of the cooling water tank is communicated with the cooling water inlet of the pit furnace;
the hot water circulating system is used for preventing the surface of the cooling water tank from being frozen and comprises a hot water tank;
the outlet of the hot water tank is communicated with the inlet of the cooling water tank through a circulating water pump, and the inlet of the hot water tank is communicated with the cooling water tank through a circulating pipeline;
a water inlet of the hot water tank or the cooling water tank is in butt joint conduction with a cooling water outlet after heat exchange in the shaft furnace;
temperature sensors are arranged in the hot water tank and the cooling water tank.
2. A nitrogen vaporization system for increasing the vaporization rate of a nitrogen vaporizer as defined in claim 1, wherein: the hot water tank and the circulating water pump are sequentially connected between the water inlet of the cooling water tank and the cooling water outlet of the pit furnace.
3. A nitrogen vaporization system for increasing the vaporization rate of a nitrogen vaporizer as defined in claim 1, wherein: the auxiliary vaporizer is connected with the vaporizer in parallel, the auxiliary vaporizer is connected with the inlet of the vaporizer through a valve respectively and is connected with the liquid nitrogen conveying pipeline, and the auxiliary vaporizer is connected with the outlet of the vaporizer through a valve respectively and is connected with the nitrogen conveying pipeline.
4. A nitrogen vaporization system for increasing the vaporization rate of a nitrogen vaporizer as defined in claim 3, wherein: the auxiliary vaporizer is installed above the cooling water tank.
5. A nitrogen vaporization system for increasing the vaporization rate of a nitrogen vaporizer as defined in claim 4, wherein: and a bracket for supporting and fixing the auxiliary vaporizer is arranged on the side wall of the cooling water tank.
6. The method for improving the vaporization rate of the nitrogen vaporizer is characterized by comprising a nitrogen vaporization system, wherein the nitrogen vaporization system comprises a liquid nitrogen conveying pipeline, the vaporizer and a nitrogen conveying pipeline which are sequentially connected along a flow guide direction;
the evaporator also comprises a cooling water circulation system, wherein the cooling water circulation system comprises a cooling water tank, and the evaporator is immersed in the cooling water tank;
the water outlet of the cooling water tank is communicated with the cooling water inlet of the pit furnace;
the hot water circulating system is used for preventing the surface of the cooling water tank from being frozen and comprises a hot water tank;
the outlet of the hot water tank is communicated with the inlet of the cooling water tank through a circulating water pump, and the inlet of the hot water tank is communicated with the cooling water tank through a circulating pipeline;
a water inlet of the hot water tank is in butt joint conduction with a cooling water outlet after heat exchange in the well type furnace;
temperature sensors are arranged in the hot water tank and the cooling water tank;
the auxiliary vaporizer is connected with the vaporizer in parallel, the inlets of the auxiliary vaporizer and the vaporizer are respectively connected with the liquid nitrogen conveying pipeline through valves, and the outlets of the auxiliary vaporizer and the vaporizer are respectively connected with the nitrogen conveying pipeline through valves;
in the initial working state, the vaporizer works, the cooling water tank cools down, when the temperature of the cooling water tank is lower than 15 ℃, the vaporizer works in an auxiliary mode, the vaporizer does not work, at the moment, the circulating water pump leads the water body in the hot water tank into the cooling water tank in a circulating mode, and the temperature in the cooling water tank is adjusted;
when the temperature in the cooling water tank exceeds 40 degrees, the vaporizer works, the auxiliary vaporizer does not work, and the circulating water pump stops circularly guiding the water in the hot water tank into the cooling water tank.
7. The method of claim 6, wherein the temperature sensors in the hot water tank and the cooling water tank are connected to a control system;
all the valves are electromagnetic valves, the control system is in control connection with the electromagnetic valves and the circulating pump, and the control system controls the opening and closing of the valves according to the conditions detected by the temperature sensor so as to control the working conditions of the vaporizer and the auxiliary vaporizer;
the control system is also connected with a timer and a memory, and the memory records the working condition information of the vaporizer and the working condition information of the auxiliary vaporizer;
the working condition information of the vaporizer comprises the starting time, the stopping time, the single working time and the total working time of each vaporizer working;
the operating condition information of the auxiliary vaporizer includes a start time, a stop time, a single operation period, and a total operation period for each operation of the vaporizer.
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