CN108821288B - Preparation device and preparation process for producing high-quality liquid carbon dioxide - Google Patents
Preparation device and preparation process for producing high-quality liquid carbon dioxide Download PDFInfo
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- CN108821288B CN108821288B CN201810713755.4A CN201810713755A CN108821288B CN 108821288 B CN108821288 B CN 108821288B CN 201810713755 A CN201810713755 A CN 201810713755A CN 108821288 B CN108821288 B CN 108821288B
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Abstract
The invention discloses a method for producing high-quality liquid carbon dioxideThe preparation device comprises a drying system, a de-weighting system, an impurity removal system and a de-weighting system, wherein the rotary dehumidifier comprises a dehumidification area and a regeneration area, the smoke cooler, the heater and the regeneration area are communicated through a regeneration gas pipeline, the dehumidification area is communicated with the compressor through a raw material gas pipeline, the compressor is communicated with the heater through a raw material gas pipeline, the de-weighting system comprises a de-weighting tower, a de-weighting circulating pump and a CO (carbon monoxide) circulating pump2A washing pump; the preparation process comprises the following steps: (1) drying and dehydrating; (2) washing and removing weight; (3) deeply removing impurities at low temperature; (4) and (5) liquefying and rectifying. The invention has simple process, low operation energy consumption and convenient operation, can ensure that the liquid carbon dioxide with the content of over 99.995 percent is stably produced under the condition of only adding a small amount of equipment on the basis of the original process equipment, reduces the generation of solid waste and lowers the investment cost.
Description
Technical Field
The invention belongs to the technical field of chemical product preparation, and particularly relates to a preparation device and a preparation process for producing high-quality liquid carbon dioxide.
Background
The carbon dioxide is widely applied to the industries of chemical industry, machinery, food, agriculture, medicine, tobacco, fire fighting and the like, has wide application, increasingly larger demand and wide development and application prospect.
At present, most of liquid carbon dioxide in the market adopts a coarse desulfurization and fine desulfurization system to remove sulfur-containing impurities, but the product quality is unstable, hydrocarbon impurities and CO are contained in finished liquid carbon dioxide2The content of the component (A) is difficult to ensure to exceed 99.995 percent, and the one-tower rectification process adopted in the prior art can only remove impurities with low boiling point and light components and can not deeply remove CO with boiling point ratio2High impurities; and the normal temperature adsorption desulfurization is adopted, the removal efficiency cannot be ensured, and a small amount of impurities such as water, sulfur and the like can be remained in the product to influence the product quality; the adsorption desulfurization can generate a large amount of saturated adsorbent solid waste and can generate secondary pollution to air; in the normal-temperature molecular sieve adsorption dehydration process adopted in the prior art, a steam or electric heating mode is needed to regenerate the molecular sieve, so that the energy consumption is high, the equipment investment is high, and the moisture content in the product is higher; the piston compressor is adopted, vulnerable articles such as piston rings and the like need to be replaced and cleaned every 2-3 months, the continuous operation time is short, and the operation cost is high.
Disclosure of Invention
The invention aims to provide a preparation device for producing high-quality liquid carbon dioxide and a technical scheme of a preparation process thereof aiming at the defects in the prior art, the preparation device is simple in process, low in operation energy consumption and convenient to operate, adopts a combined process of drying, removing heavy matters, removing impurities and removing light matters, can ensure that the liquid carbon dioxide with the content of over 99.995 percent is stably produced under the condition that only a small amount of equipment is added on the basis of the prior art equipment, adopts a dehydration technology before compression, widens the model selection range of a compressor, prolongs the service life of the compressor, and has strong integral load fluctuation resistance, liquid CO is stable, and the preparation device is high in efficiency and convenient to use2The impurities in the product are low, the generation of solid wastes is reduced, the utilization rate of heat and raw materials is increased, and the investment cost is reduced.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a production high quality liquid carbon dioxide's preparation facilities, includes drying system, takes off heavy system, edulcoration system and takes off light system, its characterized in that: the drying system comprises a rotary dehumidifier, a compressor, a heater, a smoke cooler and a dryer, the rotary dehumidifier comprises a dehumidification area and a regeneration area, the smoke cooler, the heater and the regeneration area are communicated through a regeneration gas pipeline, the dehumidification area is communicated with the compressor through a raw material gas pipeline, the compressor is communicated with the heater through a raw material gas pipeline, the heater is communicated with the smoke cooler through a raw material gas pipeline, the smoke cooler is communicated with the top of the dryer through a raw material gas pipeline, the de-weighting system comprises a de-weighting tower and a de-weighting circulating pump, a liquid carbon dioxide spray device is arranged in the de-weighting tower, the lower part of the de-weighting tower is communicated with the bottom of the dryer through a raw material gas pipeline, the bottom of the de-weighting tower is communicated with the de2The discharge pipe is communicated with the de-weighting tower, and CO passes through the space between the outlet of the de-weighting circulating pump and the smoke cooler2The discharge pipe is communicated with the CO arranged between the heavy-duty circulation pump and the smoke cooler2A carbon-sewage discharge valve is arranged on the discharge pipe; the rotary dehumidifier can continuously work to remove more than 90 percent of water, and the high-temperature CO at the outlet of the compressor is fully utilized for regeneration2Of gasesThe residual heat greatly reduces the dehydration energy consumption of the rotary dehumidifier and simultaneously leads the raw material gas CO at the outlet of the compressor2The temperature is reduced, the cooling water consumption is reduced, the system cooling water quantity is greatly reduced, the rotary dehumidifier is continuously operated, the molecular sieve dehydration load is greatly reduced, the steam consumption required by the molecular sieve regeneration is greatly reduced, and the energy consumption is saved; the air quantity of the compressor is reduced by drying before compression, so that the power consumption of the compressor is saved, and the service life of the compressor is prolonged; in the weight removal system, the principle of solubility of trace impurities in liquid carbon dioxide is utilized, and gas CO is continuously washed under the condition of low temperature2Heavy component impurities are dissolved in liquid carbon dioxide, the liquid carbon dioxide is lifted to a heavy component removal tower for recycling under the action of a heavy component removal circulating pump after being discharged continuously, and when the concentration of the liquid carbon dioxide exceeds a set standard, the liquid carbon dioxide can be discharged out of the heavy component removal tower through a carbon dioxide discharge valve, so that the utilization rate of washing liquid is increased, the impurity discharge is reduced, and the heavy component impurities and gas CO are dissolved in the liquid carbon dioxide2Reducing the CO gas2The temperature of the process provides a foundation for subsequent low-temperature treatment, reduces the yield of solid waste products and reduces the investment cost.
The top of the deep absorber is communicated with the top of the de-weighting tower through a feed gas pipeline, the bottom of the deep absorber is communicated with the top of the deep dryer through a feed gas pipeline, and the top of the deep dryer is communicated with the liquefier through a feed gas pipeline; ensures that trace sulfur, hydrocarbon, alcohol and other impurities which can not be removed by the heavy component removal tower are deeply removed at a lower working temperature, and ensures that the water content is less than 1ppm by the drying action of the deep dryer.
Furthermore, at least two depth adsorbers are arranged, and the depth adsorbers 14 are connected in series end to end; fully ensures the quality of the product.
Further, the light component removing system comprises a liquefier, a light component removing tower and a light component removing condenser, wherein the upper part of the light component removing tower is connected with the light component removing condenser, and the light component removing condenser is connected with the light component removing condenser through CO2A discharge pipe connected to the flue gas cooler and arranged between the light component removing condenser and the flue gas cooler2The discharge pipe is provided with a pressure controlValve making, the liquefier is communicated with the middle part of the lightness-removing column, and the bottom of the lightness-removing column is communicated with CO through a liquid pipeline2Washing pump connected, CO2The washing pump is communicated with the heavy component removal tower through a liquid pipeline, and the light component removal tower is communicated with the product flow control valve through a liquid pipeline; the liquefier converts CO gas2Liquefying, flowing liquefied carbon dioxide to the bottom of the tower, recycling the unliquefied light component impurity gas to the fume cooler, and discharging CO gas2The light components are separated from impurities, the emission of waste gas is reduced, and the quality of products is improved.
The preparation process for producing high-quality liquid carbon dioxide is characterized by comprising the following steps of: the method comprises the following steps:
a. drying and dewatering
Gaseous CO2After entering a rotary dehumidifier for preliminary dehydration, entering a compressor through a raw material gas pipeline for compression, entering a heater through the raw material gas pipeline, and cooling gas CO2The raw material gas enters a smoke cooler through a raw material gas pipeline for further cooling, then enters a dryer for drying again, and the cooled gas CO is dried2The dew point temperature is-20 to-50 ℃, and the cooled and dried gas CO is2Entering the next process through a raw material gas pipeline; after the rotary dehumidifier is subjected to preliminary dehydration, gas CO is obtained290 percent of water content can be removed, the gas pumping quantity of the compressor is reduced, the power of the compressor is saved, and the gas CO is effectively reduced by drying again2The residual moisture in the gas prevents CO gas containing moisture2Icing phenomenon can occur in the subsequent low-temperature de-weighting and low-temperature impurity removal processes, and the ordered operation of a preparation system is damaged; gas CO during secondary drying2The water content in the product is low, deep drying can be realized by using a small dryer, the equipment investment cost is reduced,
b. washing to remove heavy matters
Dried gaseous CO2Gas CO after heavy component impurities with higher boiling points are removed by two-stage spraying and washing in a heavy component removing tower2Discharging from the top of the de-weighting tower, and entering the next process through a feed gas pipeline; heavy component impurities dissolved in liquid CO2In and liquid CO2Are concentrated together in a de-weighting towerThe tower kettle is lifted by a heavy-duty circulating pump to lift liquid CO2Circulating to the middle part of the de-heavy tower to be used as first-stage spraying absorption liquid, namely liquid CO2Continuously discharging the liquid CO into a smoke cooler through a carbon-polluted discharge valve to ensure that the heavy component removing tower kettle is also stable, and simultaneously continuously discharging the liquid CO which ensures that the content of heavy components in the tower kettle is within the range of 0.1-5 percent and contains heavy component impurities2Is discharged through a liquid pipeline, the liquid CO2CO vaporized in the fume cooler2Quilt CO2The exhaust pipe is recycled to the smoke cooler again, and the vaporized CO in the smoke cooler2Discharging the gas into a heater through a regeneration gas pipeline to heat, and generating 100-130 ℃ high-temperature gas CO in a compressor2Can be used as a drying air source in a rotary dehumidifier; the heavy component removal circulating pump is used for removing most of liquid CO2Circulating to a de-weighting tower, discharging a small part of liquid into a smoke cooler, wherein the flow discharged into the smoke cooler is determined according to liquid CO2The concentration and the liquid level in the tower kettle are determined, so that the liquid level stability and the liquid CO of the heavy component removal tower kettle are ensured2The content of heavy components in the high-temperature regeneration gas is in the range of 0.1-5%, the high-temperature regeneration gas is used as a drying gas source of the rotary dehumidifier, the rotary dehumidifier does not need to use steam for high-temperature regeneration, the dehydration energy consumption is greatly reduced, the running cost of the rotary dehumidifier is reduced, and meanwhile, the high-temperature gas CO at the outlet of the compressor is used as2The temperature is reduced after the cooling water is utilized, the consumption of the cooling water is reduced, and the cooling cost is reduced.
c. Low temperature deep impurity removal
CO gas discharged from the top of the de-heavy tower2Entering from the top of the deep adsorber, discharging from the bottom of the deep adsorber, entering from the top of the deep dryer, and discharging from the bottom of the deep dryer to the next process.
d. Liquid distillation
Gas CO discharged from the deep dryer2After being liquefied by a liquefier, the liquid enters the lightness-removing tower from the middle part of the lightness-removing tower, and light components pass through a lightness-removing condenser and pass through CO2The exhaust pipe is conveyed into the smoke cooler; liquid CO2Settling to the bottom of the lightness-removing tower, and controlling the product flow control valve to obtain the finished product liquid CO2Collecting when the liquid isBulk CO2Liquid CO exceeding the set level when the set value is exceeded2Will be in CO2And the washing liquid is conveyed to the de-weighting tower under the action of the washing pump to be used as a supplementary washing liquid.
Further, in the step a, the rotary dehumidifier works in a continuous mode, the working pressure of a dehumidification area is 1-10 kpa, the working temperature of the dehumidification area is 20-40 ℃, the working pressure of a regeneration area is 1-10 kpa, the working temperature of the regeneration area is 110-150 ℃, the working pressure of a heater is 1-10 kpa, and the working temperature of the heater is 20-40 ℃; the temperature of the regeneration zone ensures the dehydration rate.
Further, in the step b, the operation pressure of the de-weighting tower is 2.2-4.0 Mpa, and the operation temperature is-15 to-5 ℃; so that the dehydrated CO2The gas temperature is 25-35 ℃.
Further, in the step c, the operating pressure of the deep absorber is 2.2-4.0 Mpa, the operating temperature is-15 to-5 ℃, the operating pressure of the deep dryer is 2.2-4.0 Mpa, and the operating temperature is-15 to-5 ℃; the deep adsorber deeply removes trace sulfur, hydrocarbon, alcohol and other impurities which cannot be removed by the heavy component removal tower at a lower temperature, and the deep dryer deeply removes trace moisture at a lower temperature to ensure that the moisture is lower than 1 ppm.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
the invention provides a preparation device and a preparation process for producing high-quality liquid carbon dioxide, wherein a rotary dehumidifier can continuously work to remove more than 90% of water, and the high-temperature CO at the outlet of a compressor is fully utilized for regeneration2The residual heat of the gas greatly reduces the dehydration energy consumption of the rotary dehumidifier and simultaneously leads the raw material gas CO at the outlet of the compressor2The temperature is reduced, the cooling water consumption is reduced, the system cooling water quantity is greatly reduced, the rotary dehumidifier is continuously operated, the molecular sieve dehydration load is greatly reduced, the steam consumption required by the molecular sieve regeneration is greatly reduced, and the energy consumption is saved; the air quantity of the compressor is reduced by drying before compression, so that the power consumption of the compressor is saved, and the service life of the compressor is prolonged; in the weight removing system, the dissolution of trace impurities in liquid carbon dioxide is utilizedPrinciple of decomposition, continuous scrubbing of gaseous CO at low temperature2Heavy component impurities are dissolved in liquid carbon dioxide, the liquid carbon dioxide is lifted to a heavy component removal tower for recycling under the action of a heavy component removal circulating pump after being discharged continuously, and when the concentration of the liquid carbon dioxide exceeds a set standard, the liquid carbon dioxide can be discharged out of the heavy component removal tower through a carbon dioxide discharge valve, so that the utilization rate of washing liquid is increased, the impurity discharge is reduced, and the heavy component impurities and gas CO are dissolved in the liquid carbon dioxide2Reducing the CO gas2The temperature of the process provides a foundation for subsequent low-temperature treatment, reduces the yield of solid waste products and reduces the investment cost.
The invention has simple process, low energy consumption, convenient operation, adopts the combined process of drying, heavy component removal, impurity removal and light component removal, can ensure that the liquid carbon dioxide with the content of over 99.995 percent can be stably produced under the condition that only a small amount of equipment is added on the basis of the prior process equipment, adopts the dehydration technology before compression, widens the model selection range of the compressor, prolongs the service life of the compressor, has strong integral load fluctuation resistance, and liquid CO has strong liquid CO fluctuation resistance2The impurities in the product are low, the generation of solid wastes is reduced, the utilization rate of heat and raw materials is increased, and the investment cost is reduced.
Drawings
The invention will be further described with reference to the accompanying drawings in which:
fig. 1 is a schematic flow diagram of a manufacturing apparatus for producing high-quality liquid carbon dioxide and a manufacturing process thereof according to the present invention.
In the figure: 1-a drying system; 2-a de-weighting system; 3-an impurity removal system; 4-a light component removal system; 5-a rotary dehumidifier; 6-a compressor; 7-a heater; 8-a smoke cooler; 9-a dryer; 10-a de-weighting tower; 11-a de-heavy circulating pump; 12-CO2A washing pump; 13-a carbon waste discharge valve; 14-depth adsorber; 15-deep dryer; 16-a liquefier; 17-a light component removal tower; 18-a pressure control valve; 19-product flow control valve; 20-a light component removal condenser; 21-a liquid conduit; 22-a regeneration gas pipeline; 23-a feed gas pipeline; 24-CO2A discharge pipe; 25-a dehumidification zone; 26-regeneration zone.
Detailed Description
As shown in figure 1The invention discloses a preparation device for producing high-quality liquid carbon dioxide, which comprises a drying system 1, a de-weighting system 2, an impurity removal system 3 and a light removal system 4, wherein the drying system 1 comprises a rotary dehumidifier 5, a compressor 6, a heater 7, a smoke cooler 8 and a dryer 9, the rotary dehumidifier 5 comprises a dehumidification area 25 and a regeneration area 26, the smoke cooler 8, the heater 7 and the regeneration area 26 are communicated through a regeneration gas pipeline 22, the dehumidification area 25 is communicated with the compressor 6 through a raw material gas pipeline 23, the compressor 6 is communicated with the heater 7 through a raw material gas pipeline 23, the heater 7 is communicated with the smoke cooler 8 through a raw material gas pipeline 23, the smoke cooler 8 is communicated with the top of the dryer 9 through a raw material gas pipeline 23, the de-weighting system 2 comprises a de-weighting tower 10 and a de-weighting circulating pump 11, a liquid carbon dioxide spray device is arranged in the de-weighting tower 10, the lower part of the de-weighting tower 10 is communicated with the bottom of, the bottom of the heavy component removal tower 10 is communicated with a heavy component removal circulating pump 11, and the heavy component removal circulating pump 11 passes through CO2The discharge pipe 24 is communicated with the de-weighting tower 10, and CO passes through the space between the outlet of the de-weighting circulating pump 11 and the smoke cooler 82A discharge pipe 24 is communicated with the CO arranged between the heavy matter removing circulation pump 11 and the smoke cooler 82The discharge pipe 24 is provided with a carbon-sewage discharge valve 13; the rotary dehumidifier 5 can continuously work to remove more than 90 percent of water, and the high-temperature CO at the outlet of the compressor 6 is fully utilized for regeneration2The residual heat of the gas greatly reduces the dehydration energy consumption of the rotary dehumidifier 5 and simultaneously leads the raw material gas CO at the outlet of the compressor 62The temperature is reduced, the cooling water consumption is reduced, the system cooling water quantity is greatly reduced, the rotary dehumidifier 5 continuously operates, the molecular sieve dehydration load is greatly reduced, the steam consumption required by the molecular sieve regeneration is greatly reduced, and the energy consumption is saved; the air pumping quantity of the compressor 6 is reduced by drying before compression, so that the power consumption of the compressor 6 is saved, and the service life of the compressor 6 is prolonged; in the weight removal system 2, the principle of solubility of trace impurities in liquid carbon dioxide is utilized, and gas CO is continuously washed under the condition of low temperature2Heavy component impurities are dissolved in liquid carbon dioxide, the liquid carbon dioxide is continuously discharged and lifted to a heavy component removal tower 10 for recycling under the action of a heavy component removal circulating pump 11, and when the concentration of the liquid carbon dioxide exceeds a set standard, the liquid carbon dioxide passes throughThe dirty carbon discharge valve 13 discharges the de-heavy tower 10, thereby increasing the utilization rate of the washing liquid, reducing the impurity discharge and realizing the heavy component impurity and the gas CO2Separation of (4). The impurity removal system 3 comprises a deep adsorber 14 and a deep dryer 15, the top of the deep adsorber 14 is communicated with the top of the de-weighting tower 10 through a raw material gas pipeline 23, the bottom of the deep adsorber 14 is communicated with the top of the deep dryer 15 through the raw material gas pipeline 23, and the top of the deep dryer 15 is communicated with the liquefier 16 through the raw material gas pipeline 23; ensures that trace sulfur, hydrocarbon, alcohol and other impurities which can not be removed by the heavy component removal tower 10 are deeply removed at a lower working temperature, and ensures that the water content is lower than 1ppm by the drying action of the deep dryer 15. At least two depth adsorbers 14 are arranged, and the depth adsorbers 14 are connected in series end to end; fully ensures the quality of the product. The light component removal system 4 comprises a liquefier 16, a light component removal tower 17 and a light component removal condenser 20, wherein the upper part of the light component removal tower 17 is connected with the light component removal condenser 20, and the light component removal condenser 20 passes through CO2The discharge pipe 24 communicates with the flue gas cooler 8 and the CO between the light ends removal condenser 20 and the flue gas cooler 82The discharge pipe 24 is provided with a pressure control valve 18, the liquefier 16 is communicated with the middle part of the lightness-removing column 17, and the bottom of the lightness-removing column 17 is communicated with CO through a liquid pipeline 212The washing pump 12 is communicated with CO2The washing pump 12 is communicated with the heavy component removal tower 10 through a liquid pipeline 21, and the light component removal tower 17 is communicated with a product flow control valve 19 through a liquid pipeline 21; the liquefier 16 converts the gaseous CO2Liquefying, flowing liquefied carbon dioxide to the bottom of the tower, recycling the unliquefied light component impurity gas to a fume cooler 8, and recycling the gas CO2The light components are separated from impurities, the emission of waste gas is reduced, and the quality of products is improved.
The preparation process for producing high-quality liquid carbon dioxide is characterized by comprising the following steps of: the method comprises the following steps:
a. drying and dewatering
Gaseous CO2After entering a rotary dehumidifier 5 for preliminary dehydration, entering a compressor 6 for compression through a raw material gas pipeline 23, entering a heater 7 through the raw material gas pipeline 23, and cooling gas CO2The raw material gas enters the smoke cooler 8 through the raw material gas pipeline 23 for further cooling, and then enters the dryer 9 for drying againDrying the cooled gas CO2The dew point temperature is-20 to-50 ℃, and the cooled and dried gas CO is2Entering the next process through a raw material gas pipeline 23; after the rotary dehumidifier 5 carries out preliminary dehydration, gas CO is generated2The moisture content can be removed by 90 percent, the gas pumping quantity of the compressor 6 is reduced, the power of the compressor 6 is saved, and the gas CO is effectively reduced by drying again2The residual moisture in the gas prevents CO gas containing moisture2Icing phenomenon can occur in the subsequent low-temperature de-weighting and low-temperature impurity removal processes, and the ordered operation of a preparation system is damaged; gas CO during secondary drying2The water content in the water is low, deep drying can be achieved by selecting a small dryer 9, the equipment input cost is reduced, the rotary dehumidifier 5 works in a continuous mode, the working pressure of the dehumidification area 25 is 1-10 kpa, the working temperature of the dehumidification area 25 is 20-40 ℃, the working pressure of the regeneration area 26 is 1-10 kpa, the working temperature of the regeneration area 26 is 110-150 ℃, the working pressure of the heater 7 is 1-10 kpa, and the working temperature of the heater 7 is 20-40 ℃; the temperature of the regeneration zone 26 ensures the rate of dehydration.
b. Washing to remove heavy matters
Dried gaseous CO2The gas CO after heavy component impurities with higher boiling points are removed in the heavy component removing tower 10 by two-stage spraying and washing2Discharging from the top of the de-weighting tower 10, and entering the next process through a raw material gas pipeline 23; heavy component impurities dissolved in liquid CO2In and liquid CO2Are enriched together in the tower kettle of the heavy component removing tower 10 and are lifted by a heavy component removing circulating pump 11 to remove liquid CO2Circulating to the middle part of the de-heavy tower 10 to be used as first-stage spraying absorption liquid, liquid CO2Continuously discharging the liquid CO into a smoke cooler 8 through a carbon-polluted discharge valve 13 to ensure that the liquid level of the tower 10 of the de-weighting tower is stable, and simultaneously continuously discharging the liquid CO which ensures that the content of heavy components in the tower kettle is in the range of 0.1-5 percent and contains heavy component impurities2Is discharged via a liquid line 21, the liquid CO2CO vaporized in the fume cooler 82Quilt CO2The exhaust pipe 24 is again recycled to the fume cooler 8, and the vaporized CO in the fume cooler 82Discharged to the heater 7 through the regeneration gas pipeline 22 to be heated, and 100-130 ℃ high-temperature gas CO generated in the compressor 62Can be used asA drying air source in the rotary dehumidifier 1; the heavy component removal circulating pump 11 pumps most of the liquid CO2Recycling to the de-weighting column 10, a small portion of the liquid CO2Discharged into the fume cooler 8, and the flow rate discharged into the fume cooler 8 is determined by the liquid CO2The concentration of the liquid in the tower kettle is determined, so that the liquid level stability of the tower 10 kettle of the de-weighting tower and the liquid CO are ensured2The content of heavy components in the high-temperature regeneration gas is in the range of 0.1-5%, the high-temperature regeneration gas is used as a drying gas source of the rotary dehumidifier 5, the rotary dehumidifier 5 does not need to use steam for high-temperature regeneration, the dehydration energy consumption is greatly reduced, the running cost of the rotary dehumidifier 5 is reduced, and meanwhile, the high-temperature gas CO at the outlet of the compressor 6 is used2The temperature is reduced after the cooling water is utilized, the consumption of the cooling water is reduced, and the cooling cost is reduced.
c. Low temperature deep impurity removal
CO gas discharged from the top of the de-heavy column 102Enters from the top of the deep adsorber 14, is discharged from the bottom of the deep adsorber 14, enters from the top of the deep dryer 15, and is discharged from the bottom of the deep dryer 15 to the next step. The operating pressure of the deep absorber 14 is 2.2-4.0 Mpa, the operating temperature is-15 to-5 ℃, the operating pressure of the deep dryer 15 is 2.2-4.0 Mpa, and the operating temperature is-15 to-5 ℃; the deep adsorber 14 deeply removes trace sulfur, hydrocarbon, alcohol and other impurities which cannot be removed by the heavy component removal tower 10 at a lower temperature, and the deep dryer 15 deeply removes trace moisture at a lower temperature to ensure that the moisture is lower than 1 ppm.
d. Liquid distillation
Gas CO discharged from the deep dryer 152After being liquefied by the liquefier 16, it enters the light component removal tower 17 from the middle part of the light component removal tower 17, and the light component passes through the CO by the light component removal condenser 202The discharge pipe 24 is conveyed to the smoke cooler 8; liquid CO2Settling to the bottom of the lightness-removing tower 17, and performing finished product liquid CO after being controlled by a product flow control valve 192When collecting liquid CO2Liquid CO exceeding the set level when the set value is exceeded2Will be in CO2The washing liquid is conveyed to the de-heavy tower 10 by the washing pump 12 to be used as a supplementary washing liquid.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
the invention provides a preparation device and a preparation process for producing high-quality liquid carbon dioxide.A rotary dehumidifier 5 can continuously work to remove more than 90 percent of water, and the regeneration fully utilizes high-temperature CO at the outlet of a compressor 62The residual heat of the gas greatly reduces the dehydration energy consumption and simultaneously leads the raw material gas CO at the outlet of the compressor 62The temperature is reduced, the cooling water consumption is reduced, the system cooling water quantity is greatly reduced, the rotary dehumidifier 5 continuously operates, the molecular sieve dehydration load is greatly reduced, the steam consumption required by the molecular sieve regeneration is greatly reduced, and the energy consumption is saved; the air pumping quantity of the compressor 6 is reduced by drying before compression, so that the power consumption of the compressor 6 is saved, and the service life of the compressor 6 is prolonged; in the weight removal system 2, the principle of solubility of trace impurities in liquid carbon dioxide is utilized, and gas CO is continuously washed under the condition of low temperature2Heavy component impurities are dissolved in liquid carbon dioxide, the liquid carbon dioxide is continuously discharged and lifted to the heavy component removal tower 10 for recycling under the action of the heavy component removal circulating pump 11, when the concentration of the liquid carbon dioxide exceeds a set standard, the liquid carbon dioxide can be discharged out of the heavy component removal tower 10 through the carbon dioxide discharge valve 13, the utilization rate of washing liquid is increased, the impurity discharge is reduced, and the heavy component impurities and gas CO are realized2Reducing the CO gas2The temperature of the process provides a foundation for subsequent low-temperature treatment, reduces the yield of solid waste products and reduces the investment cost.
The invention has simple process, low energy consumption, convenient operation, adopts the combined process of drying, heavy component removal, impurity removal and light component removal, can ensure that the liquid carbon dioxide with the content of over 99.995 percent can be stably produced under the condition that only a small amount of equipment is added on the basis of the prior process equipment, adopts the dehydration technology before compression, widens the model selection range of the compressor 6, prolongs the service life of the compressor 6, has strong integral load fluctuation resistance and liquid CO2The impurities in the product are low, the generation of solid wastes is reduced, the utilization rate of heat and raw materials is increased, and the investment cost is reduced.
The above is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any simple variations, equivalent substitutions or modifications based on the present invention to achieve substantially the same technical effects are within the scope of the present invention.
Claims (8)
1. The utility model provides a production high quality liquid carbon dioxide's preparation facilities, includes drying system, takes off heavy system, edulcoration system and takes off light system, its characterized in that: the drying system comprises a rotary dehumidifier, a compressor, a heater, a smoke cooler and a dryer, the rotary dehumidifier comprises a dehumidification area and a regeneration area, the smoke cooler, the heater and the regeneration area are communicated through a regeneration gas pipeline, the dehumidification area is communicated with the compressor through a raw material gas pipeline, the compressor is communicated with the heater through the raw material gas pipeline, the heater is communicated with the smoke cooler through the raw material gas pipeline, the smoke cooler is communicated with the top of the dryer through the feed gas pipeline, the de-weighting system comprises a de-weighting tower and a de-weighting circulating pump, a liquid carbon dioxide spray device is arranged in the heavy component removal tower, the lower part of the heavy component removal tower is communicated with the bottom of the dryer through the feed gas pipeline, the bottom of the heavy component removal tower is communicated with the heavy component removal circulating pump, and the heavy component removal circulating pump passes through CO.2The discharge pipe is communicated with the de-weighting tower, and the CO passes between the outlet of the de-weighting circulating pump and the smoke cooler2A discharge pipe communicated with the flue gas cooler and arranged between the weight-removing circulating pump and the flue gas cooler2The discharge pipe is provided with a carbon-sewage discharge valve.
2. The production apparatus for high-quality liquid carbon dioxide according to claim 1, wherein: the edulcoration system includes degree of depth adsorber and deep drier, the top warp of degree of depth adsorber the feed gas pipeline with the top intercommunication of heavy tower takes off, the bottom warp of degree of depth adsorber the feed gas pipeline with the top intercommunication of deep drier, the top warp of deep drier feed gas pipeline and liquefier intercommunication.
3. The production apparatus for high-quality liquid carbon dioxide according to claim 2, wherein: the depth adsorbers are at least provided with two, and the depth adsorbers are connected in series end to end.
4. The production apparatus for high-quality liquid carbon dioxide according to claim 1, wherein: the light component removing system comprises a liquefier, a light component removing tower and a light component removing condenser, wherein the upper part of the light component removing tower is connected with the light component removing condenser, and the light component removing condenser passes through the CO2A discharge pipe is communicated with the smoke cooler and positioned between the light component removal condenser and the smoke cooler2A pressure control valve is arranged on the discharge pipe, the liquefier is communicated with the middle part of the lightness-removing tower, and the bottom of the lightness-removing tower is communicated with CO through a liquid pipeline2The washing pump is communicated, and the CO is2The washing pump is communicated with the heavy component removal tower through the liquid pipeline, and the light component removal tower is communicated with the product flow control valve through the liquid pipeline.
5. The production process for producing high-quality liquid carbon dioxide by using the production apparatus according to claim 1, characterized in that: the method comprises the following steps:
a. drying and dewatering
Gaseous CO2After entering a dehumidification area of a rotary dehumidifier for preliminary dehydration, the gas enters a compressor through a raw material gas pipeline for compression, then enters a heater through the raw material gas pipeline, and the cooled gas CO2The raw material gas enters a smoke cooler through a raw material gas pipeline for further cooling, then enters a dryer for drying again, and the cooled and dried gas CO2The dew point temperature is minus 20 to minus 50 ℃, and the gas CO is cooled and dried2Entering the next process through a raw material gas pipeline;
b. washing to remove heavy matters
Dried gaseous CO2Gas CO after heavy component impurities with higher boiling points are removed by two-stage spraying and washing in a heavy component removing tower2Discharged from the top of the de-heavy tower and enters the de-heavy tower through a raw material gas pipelineEntering the next working procedure; heavy component impurities dissolved in liquid CO2In and liquid CO2The CO is enriched in a tower kettle of the de-heavy tower and is discharged to a de-heavy circulating pump through a liquid pipeline, and the CO is lifted by the de-heavy circulating pump to be liquid2Circulating to the middle part of the de-heavy tower to be used as first-stage spraying absorption liquid, namely liquid CO2Continuously discharging the liquid CO into a smoke cooler through a carbon-polluted discharge valve to ensure that the heavy component removing tower kettle is also stable, and simultaneously continuously discharging the liquid CO which ensures that the content of heavy components in the tower kettle is within the range of 0.1-5 percent and contains heavy component impurities2Is discharged through a liquid pipeline, the liquid CO2CO vaporized in the fume cooler2Quilt CO2The exhaust pipe is recycled to the smoke cooler again, and the vaporized CO in the smoke cooler2Discharging the gas into a heater through a regeneration gas pipeline to heat, and generating 100-130 ℃ high-temperature gas CO in a compressor2As a drying air source in a rotary dehumidifier;
c. low temperature deep impurity removal
Gas CO discharged from the top of the de-heavy column2Entering from the top of the deep adsorber, discharging from the bottom of the deep adsorber, entering from the top of the deep dryer, and finally discharging from the bottom of the deep dryer to the next process;
d. liquid distillation
Gas CO discharged from the deep dryer2After being liquefied by a liquefier, the liquid enters the lightness-removing tower from the middle part of the lightness-removing tower, and light components pass through CO2The discharge pipe and the light component removing condenser are circulated into the smoke cooler, and liquid CO is obtained2Settling to the bottom of the lightness-removing tower, and controlling the product flow control valve to obtain the product liquid CO2When collecting liquid CO2Liquid CO exceeding the set level when the set value is exceeded2Will be in CO2And the washing liquid is conveyed into the de-weighting tower under the action of a washing pump and is used as a supplementary washing liquid.
6. The production process of producing high-quality liquid carbon dioxide by the production apparatus according to claim 5, characterized in that: in the step a, the rotary dehumidifier works in a continuous mode, the working pressure of the dehumidification area is 1-10 kpa, the working temperature of the dehumidification area is 20-40 ℃, the working pressure of the regeneration area is 1-10 kpa, the working temperature of the regeneration area is 110-150 ℃, the working pressure of the heater is 1-10 kpa, and the working temperature of the heater is 20-40 ℃.
7. The production process of producing high-quality liquid carbon dioxide by the production apparatus according to claim 5, characterized in that: in the step b, the operating pressure of the de-weighting tower is 2.2-4.0 Mpa, and the operating temperature is-15 to-5 ℃.
8. The production process of producing high-quality liquid carbon dioxide by the production apparatus according to claim 5, characterized in that: in the step c, the operating pressure of the deep adsorber is 2.2-4.0 Mpa, the operating temperature is-15 to-5 ℃, the operating pressure of the deep dryer is 2.2-4.0 Mpa, and the operating temperature is-15 to-5 ℃.
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| CN110801639B (en) * | 2019-11-11 | 2021-06-01 | 杭州快凯高效节能新技术有限公司 | Method for recovering carbon dioxide by multistage liquefaction and fractional refrigeration of industrial tail gas |
| CN111675220B (en) * | 2020-05-08 | 2023-06-27 | 江西江氨科技有限公司 | CO-containing in tail gas from carbonate production 2 Extraction and refining system |
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