CN211147075U - Cold volume recovery unit of adiabatic storage tank blowdown - Google Patents

Cold volume recovery unit of adiabatic storage tank blowdown Download PDF

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Publication number
CN211147075U
CN211147075U CN201922043436.XU CN201922043436U CN211147075U CN 211147075 U CN211147075 U CN 211147075U CN 201922043436 U CN201922043436 U CN 201922043436U CN 211147075 U CN211147075 U CN 211147075U
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China
Prior art keywords
cooling tower
storage tank
water
pipe
air
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CN201922043436.XU
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Chinese (zh)
Inventor
刘代勇
张冰
冷全起
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HENAN KAIYUAN AIR SEPARATION GROUP CO Ltd
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HENAN KAIYUAN AIR SEPARATION GROUP CO Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
    • F25J3/04157—Afterstage cooling and so-called "pre-cooling" of the feed air upstream the air purification unit and main heat exchange line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/30—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes
    • F25J2205/32—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes as direct contact cooling tower to produce a cooled gas stream, e.g. direct contact after cooler [DCAC]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/30—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes
    • F25J2205/34—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes as evaporative cooling tower to produce chilled water, e.g. evaporative water chiller [EWC]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2245/00—Processes or apparatus involving steps for recycling of process streams
    • F25J2245/90—Processes or apparatus involving steps for recycling of process streams the recycled stream being boil-off gas from storage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2270/00—Refrigeration techniques used
    • F25J2270/90—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2270/00—Refrigeration techniques used
    • F25J2270/90—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration
    • F25J2270/904—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration by liquid or gaseous cryogen in an open loop

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

The utility model belongs to the technical field of cryogenic air separation, concretely relates to cold volume recovery unit of adiabatic storage tank unloading gas, store system and precooling system including liquid nitrogen, liquid ammonia stores the system and includes adiabatic storage tank and the blow-down pipe of setting at adiabatic storage tank top, be provided with blow-down valve, recovery valve and manometer on the blow-down pipe, precooling system includes a water cooling tower at least, the water cooling tower passes through nitrogen gas pipe and blow-down pipe connection liquid nitrogen and stores the system. The device can collect the energy of the air release, can reduce the operating cost of the power refrigeration equipment, thereby saving electric energy, and simultaneously, the air release is heated to about 32 ℃ from minus 195 ℃, thereby effectively solving the problem of harm of low-temperature gas to the environment in winter.

Description

Cold volume recovery unit of adiabatic storage tank blowdown
Technical Field
The utility model belongs to the technical field of cryogenic air separation, concretely relates to cold volume recovery unit of adiabatic storage tank blowdown.
Background
the large-scale low-temperature storage tank is widely used for storing low-temperature liquid (hereinafter referred to as medium) such as liquid oxygen, liquid nitrogen, L NG and the like The tank is a vertical normal-pressure flat-bottom double-shell metal tank, an inner tank is made of austenitic stainless steel materials, an outer tank is made of common carbon steel, the bottom of the inner tank is insulated by foam glass bricks, pearled sand is adopted between the inner tank and the outer tank for heat insulation, the tank belongs to a powder common heat insulation storage tank, and a single inner container type effective design volume is 250 m minimum 3Maximum 5000 m 3The above.
The low-temperature storage tank is influenced by the environment, external heat is inevitably transmitted into the low-temperature storage tank, a certain evaporation rate is inevitably generated, and important indexes such as a filling rate, an insulation thickness, a daily evaporation rate and the like are respectively given according to effective volumes in an industry standard JB/T9077-1999 powder common insulation storage tank. Wherein the daily evaporation rate is directly related to the economic benefit after the storage tank is put into operation. At 5000 m 3For example, when the daily evaporation rate of the liquid nitrogen cryogenic storage tank is 0.19%, the volume of liquid nitrogen evaporated per day is 9.5m 3Equivalent to 7600 standard cubic nitrogen gas being evacuated every day, not only the loss of materials but also a large amount of cold energy is taken away. In addition, a large amount of low-temperature gas is discharged into the atmosphere to influence local climate in winter, thereby causing cluster fog, influencing sight, causing harm to the environment and easily causing secondary disaster.
Disclosure of Invention
In order to solve the problem of waste of the cooling capacity of the discharged air of the liquid nitrogen storage tank in the prior art, the utility model provides a cooling capacity recovery device of the discharged air of the heat insulation storage tank.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
The utility model provides a cold volume recovery unit of adiabatic storage tank unloading, includes liquid nitrogen storage system and precooling system, liquid nitrogen storage system includes adiabatic storage tank and sets up the blow-down pipe at adiabatic storage tank top, be provided with atmospheric valve, recovery valve and manometer on the blow-down pipe, precooling system includes a water cooling tower at least, the water cooling tower passes through nitrogen gas pipe and blow-down pipe connection liquid nitrogen storage system.
Furthermore, a controller is arranged between the pressure gauge and the emptying valve.
Furthermore, the precooling system also comprises an air cooling tower, wherein the inlet of the air cooling tower is respectively connected with an air pipeline, a circulating water pipeline and the water cooling tower, and the outlet of the air cooling tower is respectively connected with the air pipeline and the circulating water pipeline.
And further, a cooling water pump is arranged on the circulating water pipeline connected with the air cooling tower, and a freezing water pump and a water chilling unit are arranged on the connecting pipeline between the water cooling tower and the air cooling tower.
Further, a liquid level detector is arranged on the water cooling tower and connected with a second controller, and the second controller is connected with the recovery valve.
Furthermore, one end of the nitrogen pipe is connected with an inlet of the water cooling tower, and the other end of the nitrogen pipe is respectively connected with the emptying pipe and the sewage nitrogen pipe.
Further, a check valve is arranged on the emptying pipe between the recovery valve and the water cooling tower.
Compared with the prior art, the utility model discloses following beneficial effect has:
(1) The utility model provides a pair of cold volume recovery unit of adiabatic storage tank blow-down gas through set up water cooling tower and air cooling tower behind the liquid nitrogen storage tank, can retrieve the cold volume of liquid nitrogen storage tank blow-down gas, is used for circulating water and raw materials air's cooling with the cold volume of retrieving to 1500 m 3The liquid nitrogen low-temperature storage tank can save electricity by 66 degrees every day, and can reduce the operating cost of power refrigeration equipment, thereby saving electric energy.
(2) The utility model provides a pair of cold volume recovery unit of adiabatic storage tank blowdown gas heats up the blowdown gas in the liquid nitrogen storage tank to about 32 ℃ from-195 ℃, has effectively reduced the harm of winter low temperature gas to the environment.
Drawings
Fig. 1 is a schematic structural view of the device for recovering cold from the exhausted air of the adiabatic storage tank of the present invention.
In the drawings, the reference numbers: the system comprises a liquid nitrogen storage tank 1, a first controller 20, a second controller 21, a pressure gauge 3, an air release valve 40, a recovery valve 41, a check valve 42, a water cooling tower 5, a liquid level detector 6, an air cooling tower 7, a cooling water pump 8, a water chilling unit 9, an air release pipe 10, a waste nitrogen pipe 11, a nitrogen pipe 12, an overflow pipe 13 and a freezing water pump 14.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.
The utility model provides a cold volume recovery unit of adiabatic storage tank unloading gas, as shown in figure 1, includes liquid nitrogen storage system and precooling system, liquid ammonia storage system includes adiabatic storage tank and sets up the blow-down pipe 10 at adiabatic storage tank top, be provided with atmospheric valve 40, recovery valve 41 and manometer 3 on the blow-down pipe 10, atmospheric valve 40 directly leads to, precooling system includes a water cooling tower 5 at least, water cooling tower 5 passes through nitrogen gas pipe 12 and blow-down pipe 10 and connects the liquid nitrogen storage system.
As an implementation mode, a controller 20 is arranged between the pressure gauge 3 and the emptying valve 40, the opening of the emptying valve 40 is controlled by the controller 20, when the recovery valve 41 closes the electromagnetic valve and is in a power-off state or opens the electromagnetic valve and is in a power-on state, the pressure in the pressure gauge 3 still exceeds a set value, and the controller 20 controls the electromagnetic valve of the emptying valve 40 to be powered on and opened, otherwise, the electromagnetic valve is powered off and closed.
As an implementation mode, the pre-cooling system further includes an air cooling tower 7, an inlet of the air cooling tower 7 is connected to the air pipeline, the circulating water pipeline and the water cooling tower 5, and an outlet of the air cooling tower 7 is connected to the air pipeline and the circulating water pipeline; the inlet air of the air pipeline comes from the outlet of the air separation raw material air compressor, and the outlet air is purified by the air separation purification system.
In one embodiment, a cooling water pump 8 is provided on the circulating water pipe connecting the air cooling tower 7, and a chilled water pump 14 and a water chiller 9 are provided on the connecting pipe connecting the water cooling tower 5 and the air cooling tower 7.
As an implementation manner, a liquid level detector 6 is arranged on the water cooling tower 5, the liquid level detector 6 is connected with a second controller 21, the second controller 21 is connected with the recovery valve 41, and when the liquid level of the water cooling tower 5 is lower than a set value or circulating water pipes entering the water cooling tower 5 and the air cooling tower 7 are in a closed state, the second controller 21 controls the electromagnetic valve of the recovery valve 41 to be closed or closed, or to be opened.
As an implementation mode, one end of the nitrogen pipe 12 is connected with the inlet of the water cooling tower 5, the other end is respectively connected with the emptying pipe 10 and the waste nitrogen pipe 11, and waste nitrogen in the waste nitrogen pipe 11 is derived from air separation unit cold box technology.
In one embodiment, a check valve 42 is further provided on the blow-down pipe 10 between the recovery valve 41 and the water cooling tower 5 in order to prevent the back flow of the dirty nitrogen gas in the dirty nitrogen pipe 11 into the liquid nitrogen storage tank 1.
As an implementation mode, an overflow pipe 13 is arranged inside the cooling tower 5, the top of the overflow pipe 13 is ventilated, when the water level of the water cooling tower 5 is low or no water exists, nitrogen can be discharged to a high position through a top pipeline to prevent suffocation, the lower part of the overflow pipe 13 is connected into a trench, and when the water level is too high, the nitrogen can be discharged into the trench through a lower pipeline.
Taking a 220T liquid air-conditioner produced at a certain day as an example, the using process is as follows: the flow rate of waste nitrogen at the inlet of a water cooling tower 5 in the precooling system is 1796 standard cubic meter, the temperature is 37 ℃, the cooling water amount is 10.4T/H, and the cooling water temperature is 37 ℃; a powder common heat insulation liquid nitrogen storage tank 1 with the working pressure of 10KPa, the volume of 1500 cubes, the daily evaporation rate of 0.29 percent and the liquid nitrogen evacuation of 0.435 cube every day is configured in the liquid nitrogen storage system and is converted into gaseous 2819 standard cubic nitrogen (117 standard cubes per hour);
Dirty nitrogen (flow 1796 standard cubic, temperature 36.9 deg.C, pressure 8KPa) obtained by known air separation plant cold box technology is mixed with low temperature nitrogen (flow 117 standard cubic, temperature-195 deg.C, pressure 10KPa) from the top vent 10 of the liquid nitrogen storage tank 1 through a dirty nitrogen pipe 11, and then enters a water cooling tower 5, and the temperature of the mixed gas is 22.7 deg.C.
The water cooling tower 5 is a bulk packed tower, the top of the tower is provided with a demister and a water distributor, the inside of the tower is provided with a bulk polypropylene pall ring, cooled water enters the tower from the upper part of the tower through a water inlet pipe and a water feeding valve and flows out from the bottom through a water outlet pipe, and mixed gas enters the tower from the lower part of the tower through a nitrogen pipe 12. In order to prevent water from entering the nitrogen gas pipe 12, the water cooling tower 5 is provided with a liquid level detector 6 and an overflow pipe 13, when the water level reaches a certain height, the water overflows from the overflow pipe 13 and cannot enter the nitrogen gas pipe 12. The dirty nitrogen and water are exchanged by heat and mass in the tower, the dirty nitrogen is humidified and heated to 32 ℃ and then is discharged into the atmosphere from the top of the tower, the circulating water is cooled to 27.2 ℃ in the water cooling tower 5, pressurized and sent into the water chilling unit 9 from the bottom of the tower through the chilled water pump 14, and the water is cooled to 8 ℃ in the water chilling unit 9 and sent into the air cooling tower 7 for cooling the air.
In order to prevent the circulating water pipeline from stopping supplying water to the water cooling tower 5 when the air separation device is stopped in an accident, nitrogen gas leaks from the overflow pipe 13 to cause harm (nitrogen gas suffocation) when the liquid level of the water cooling tower 5 is reduced below the overflow pipe 13, and the recovery valve 41 is closed through the second controller 21 when the liquid level is lower than a certain set value or the electromagnetic valve of the water supply valve is powered off and the circulating water stops supplying water.
When the electromagnetic valve of the recovery valve 41 is powered off or the pressure gauge 3 at the top of the fully-opened storage tank of the recovery valve 41 is still higher than a certain set value due to the reasons, the vent valve 40 is opened through the first controller 20 and is exhausted to the atmosphere.
When the pressure of the dirty nitrogen in the dirty nitrogen pipe 11 rises to be more than 10kpA due to improper operation of the cold box of the air separation device, the check valve 42 is closed, and the dirty nitrogen is prevented from flowing back to the liquid nitrogen storage tank 1 through the emptying pipe 10.
Through practice, adopt the utility model discloses the refrigerating output of the every day of the preceding back cooling water set 9 of device is 210KW, 223KW respectively, retrieves cold energy and is about 13KW, according to GB19577-2015 "cooling water set efficiency limiting value and energy efficiency grade" medium energy efficiency grade index: the water-cooled refrigerating capacity is less than or equal to 528KW, and COP = 4.2-5.6; and combining with a screw type water chilling unit COP =4.72 with rated refrigerating capacity 236KW of a certain manufacturer; the daily power saving was calculated to be 66 degrees taking COP = 4.72.
The foregoing is a more detailed description of the present invention that is presented in conjunction with specific embodiments, and it is not to be understood that the specific embodiments of the present invention are limited to these descriptions. To the ordinary skilled person in the technical field of the present invention, without departing from the concept of the present application, a plurality of simple deductions or replacements can be made, all of which should be considered as belonging to the protection scope of the present invention.

Claims (7)

1. The utility model provides a cold volume recovery unit of adiabatic storage tank unloading, includes liquid nitrogen storage system and precooling system, liquid nitrogen storage system includes adiabatic storage tank and sets up blow-down pipe (10) at adiabatic storage tank top, its characterized in that, be provided with air release valve (40), recovery valve (41) and manometer (3) on blow-down pipe (10), precooling system includes a water cooling tower (5) at least, water cooling tower (5) are through nitrogen gas pipe (12) and blow-down pipe (10) connection liquid nitrogen storage system.
2. An adiabatic sump vent coldness recovery apparatus as set forth in claim 1 wherein a controller (20) is provided between said pressure gauge (3) and the vent valve (40).
3. The adiabatic sump blowdown refrigeration recovery apparatus according to claim 1, wherein the precooling system further comprises an air cooling tower (7), an inlet of the air cooling tower (7) is connected to the air pipeline, the circulating water pipeline and the water cooling tower (5), and an outlet of the air cooling tower is connected to the air pipeline and the circulating water pipeline.
4. The thermal insulation storage tank emptying air cold energy recovery device according to claim 3, characterized in that a cooling water pump (8) is arranged on a circulating water pipeline connecting the air cooling tower (7), and a freezing water pump (14) and a water chilling unit (9) are arranged on a connecting pipeline connecting the water cooling tower (5) and the air cooling tower (7).
5. The adiabatic storage tank vent coldness recovery device of claim 1, wherein the water cooling tower (5) is provided with a liquid level detector (6), the liquid level detector (6) is connected with a second controller (21), and the second controller (21) is connected with the recovery valve (41).
6. The adiabatic storage tank vent cold recovery device of claim 1, wherein one end of the nitrogen pipe (12) is connected with the inlet of the water cooling tower (5), and the other end is respectively connected with the vent pipe (10) and the waste nitrogen pipe (11).
7. An insulated sump blowdown refrigeration recovery apparatus as claimed in claim 1 wherein a check valve (42) is also provided in the blowdown pipe (10) between the recovery valve (41) and the water cooling tower (5).
CN201922043436.XU 2019-11-25 2019-11-25 Cold volume recovery unit of adiabatic storage tank blowdown Active CN211147075U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201922043436.XU CN211147075U (en) 2019-11-25 2019-11-25 Cold volume recovery unit of adiabatic storage tank blowdown

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201922043436.XU CN211147075U (en) 2019-11-25 2019-11-25 Cold volume recovery unit of adiabatic storage tank blowdown

Publications (1)

Publication Number Publication Date
CN211147075U true CN211147075U (en) 2020-07-31

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
CN (1) CN211147075U (en)

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