CN108641763A - A kind of processing method of triethylene glycol dehydration regeneration air lift tail gas - Google Patents
A kind of processing method of triethylene glycol dehydration regeneration air lift tail gas Download PDFInfo
- Publication number
- CN108641763A CN108641763A CN201810082863.6A CN201810082863A CN108641763A CN 108641763 A CN108641763 A CN 108641763A CN 201810082863 A CN201810082863 A CN 201810082863A CN 108641763 A CN108641763 A CN 108641763A
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- China
- Prior art keywords
- triethylene glycol
- gas
- air lift
- tail gas
- surge tank
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Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
- C10L3/106—Removal of contaminants of water
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/54—Specific separation steps for separating fractions, components or impurities during preparation or upgrading of a fuel
- C10L2290/541—Absorption of impurities during preparation or upgrading of a fuel
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Gas Separation By Absorption (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention provides a kind of processing methods of triethylene glycol dehydration regeneration air lift tail gas, dehydrated natural gas enters fuel gas surge tank, converge with triethylene glycol flash drum overhead gas, and after being mixed again with condensed water surge tank top gas after direct-operated regulator depressurizes, into burner, generate high-temperature flue gas, the poor triethylene glycol in fire tube type heat exchanger heating reboiler, low-temperature flue gas is then discharged by exhaust tube after heat exchange, lean/rich triethylene glycol heat exchanger realizes the recycling of heat, it can be energy saving, the environmental pollution that the present invention can avoid tail gas in line simultaneously, reduce cost of investment simultaneously.
Description
Technical field
The present invention relates to natural gas processing fields, specifically, being related to a kind of triethylene glycol dehydration regeneration air lift tail gas
Processing method.
Background technology
Absorption dewatering is according to principle of absorption, using a kind of water seeking liquid and natural gas counter current contacting, to remove gas
In vapor, be known as being dehydrated absorbent or liquid drier (abbreviation drier) for the water seeking liquid that is dehydrated.
Udex process is dehydrated is currently widely used two kinds of gas dehydration methods with the dehydration of solid absorbent method.For sweet
For the dehydration of alcohol method, since triethylene glycol dehydration depoint depression is big, at low cost and reliable for operation, it is economical in various glycol compounds
Benefit is best.Thus widely used in foreign countries.In China, due to factors such as the yield and price of diethylene glycol (DEG) and triethylene glycol, three is sweet
Alcohol and diethylene glycol (DEG) have use.When that can be met the requirements using triethylene glycol dehydration and solid absorbent dehydration, using triethylene glycol
It is more preferable to be dehydrated economic benefit.Udex process is dehydrated compared with solid absorbent is dehydrated, its advantage is that：
1. investing relatively low.It is reported that it is 28 × 104Nm to build a processing capacity3The solid absorbent of/d natural gases is de-
Water installations, it is higher by 50% than TEG dehydration device investment, and it is 140 × 104Nm to build a processing capacity3/ d natural gases are consolidated
Body adsorbent dehydration device, investment are also about high by 33%.
2. pressure drop is smaller.The pressure drop of udex process dehydration is 35-70KPa, and the pressure drop of solid absorbent method dehydration is 70-
200kPa。
3. udex process dehydration is continuous operation, and solid absorbent method is intermittently operated.
4. be easier using supplement glycol when udex process dehydration, and use the dehydration of solid absorbent method, from adsorption tower
It is time-consuming longer that solid absorbent is replaced in (drier).
5. when the glycol rich solution regeneration of glycol dehydration device, the heat removed needed for 1kg moisture is less.
6. some impurity can be such that solid absorbent blocks, but be influenced on the operation of glycol dehydration device very small.
7. the water content in natural gas can be reduced to 0.008g/m by glycol dehydration device3.If there is lean solution air lift column, profit
It is regenerated with gas stripping gas, the water content in natural gas even can be reduced to 0.004g/m3。
Udex process is dehydrated compared with solid absorbent is dehydrated, the disadvantage is that：
1. the dewpoint requirements of natural gas are less than -30 DEG C, need to be regenerated using air- extraction.
2. glycol it is contaminated or decompose after have corrosivity.
Absorption process dehydration is mainly used for the occasion for making gas dew point meet the defeated requirement of pipe, generally build central treating station in
In (moisture is from surrounding gas well or gas gathering station), the gas transmission initial station or downstream of Gas Purification Factory desulfurization, decarbonization device, absorption process
Dehydration will produce tail gas, if direct emission pollutes the environment.
Invention content
It is an object of the invention to overcome the shortcoming of above-mentioned traditional technology, a kind of triethylene glycol dehydration regeneration air lift is provided
The processing method of tail gas, including triethylene glycol regeneration technology, rich triethylene glycol enters triethylene glycol flash tank in triethylene glycol regeneration technology,
Absorbed hydrocarbon gas is isolated under low pressure, flashed vapour is used as generative fuel gas；
Rich triethylene glycol after flash distillation removes the liquid such as heavy hydrocarbon, chemical agent and lubricating oil through active carbon filter successively, enters
Lean/rich triethylene glycol heat exchanger, enters rectifying column after heating, capital vapor is buffered through silk screen foam removal, air cooler cooling, condensed water
Tank, gas is drawn by tank deck is used as generative fuel gas, and liquid is then led to out-of-bounds through sewage header；
Poor triethylene glycol after regeneration flows into triethylene glycol reboiler by rectifying column stripping section, and natural using dehydration through air lift column
After gas air lift enrichment, into reboiler surge tank, the poor triethylene glycol of high temperature drawn from reboiler surge tank is changed through lean/rich triethylene glycol
After hot device recycling heat, radiates using finned tube, into triethylene glycol circulating pump, out-of-bounds absorption plant is sent to after supercharging；
Dehydrated natural gas enters fuel gas surge tank, converges with triethylene glycol flash drum overhead gas, and adjusted through self-operated type
After valve decompression is mixes again with condensed water surge tank top gas afterwards, into burner, high-temperature flue gas is generated, is changed through fire-tube type
Poor triethylene glycol in hot device heating reboiler, low-temperature flue gas is then discharged by exhaust tube after heat exchange；
Air lift gas pipeline is equipped with restriction orifice, it is ensured that and the tail gas at the top of condensate liquid surge tank does not exceed fuel gas dosage,
Condensed water surge tank high point, which is added, is arranged stop valve on exhaust line, interlocked with reboiler high-temperature, when overtemperature, burner electromagnetism
Valve is closed, and temperature is reduced to nominal situation, burner solenoid valve to open, and tail gas enters burner together with fuel gas.
Further, the rich triethylene glycol for carrying out self-absorption sledge removes 5 μm or more of solid impurity through level-one mechanical filter,
Then enter the overhead condenser at the top of rectifying column, triethylene glycol flash tank is entered after being preheated to 55 DEG C.
Further, the rich triethylene glycol after flash distillation removes heavy hydrocarbon, chemical agent and lubricating oil etc. through active carbon filter successively
5 μm or more of solid impurity is removed through secondary filter after liquid again.
Further, into the rich triethylene glycol of lean/rich triethylene glycol heat exchanger and the poor triethylene glycol heat exchange of high temperature to 175 DEG C.
Further, the poor triethylene glycol of high temperature drawn from reboiler surge tank recycles heat through lean/rich triethylene glycol heat exchanger
Afterwards, temperature is down to 80 DEG C or less.
Further, poor triethylene glycol is pressurized to after 9.8MPaG and is sent to out-of-bounds absorption plant by triethylene glycol circulating pump.
By adopting the above-described technical solution, compared with prior art, it is an advantage of the invention that：
It avoids tail gas in line, reduces environmental pollution；
Triethylene glycol flash tank isolates absorbed hydrocarbon gas (heavy hydrocarbon including aromatic hydrocarbon) under low pressure, to subtract
The gas and glycol loss amount of few rectifying column, and environmental protection；
Restriction orifice is added in air lift gas pipeline, ensures that maximum stream flow is no more than 50Nm3/ h, so that it is guaranteed that condensate liquid buffers
The tail gas of tank top does not exceed fuel gas dosage；
Lean/rich triethylene glycol heat exchanger realizes the recycling of heat, can be energy saving；
Exhaust line is added in condensed water surge tank high point, stop valve is set, establish the emergency processing machine of overtemperature accident conditions
System；
Dewatered natural gas air lift can ensure the poor glycol mass concentration after regeneration 99% or more；
Tail gas incineration system need not be separately provided, reduce equipment investment expense.
Present invention will be further explained below with reference to the attached drawings and specific embodiments.
Description of the drawings
Attached drawing 1 is a kind of process flow process structure signal of triethylene glycol dehydration regeneration air lift tail gas of the invention
Figure.
Wherein, 1- level-ones mechanical filter, 2- triethylene glycol flash tanks, 3- fuel gas surge tanks, 4- active carbon filters, 5-
Triethylene glycol circulating pump, 6- secondary mechanical filters, the lean/rich triethylene glycol heat exchangers of 7-, 8- rectifying columns, 9- triethylene glycol reboilers, 10-
Air lift column, 11- reboiler surge tanks, 12- air coolers, 13- condensed water surge tanks, 14- burners.
Specific implementation mode
Embodiment：As shown in Fig. 1,95% rich triethylene glycol (40 DEG C, 0.3MPaG) carrys out self-absorption sledge, through level-one machinery mistake
Filter 1 removes 5 μm or more of solid impurity, then enters the overhead condenser at 8 top of rectifying column, three are entered after being preheated to 55 DEG C
Glycol flash tank 2 isolates absorbed hydrocarbon gas (heavy hydrocarbon including aromatic hydrocarbon), to reduce rectifying column under low pressure
8 gas and glycol loss amount, and environmental protection, flashed vapour are used as generative fuel gas, and the rich triethylene glycol after flash distillation passes through successively
Active carbon filter 4 removes the liquid such as heavy hydrocarbon, chemical agent and lubricating oil, and secondary mechanical filter 6 removes 5 μm or more and consolidates again
Body impurity, it is poor by high temperature into lean/rich triethylene glycol heat exchanger 7 after so that the mass fraction of solid impurity in glycol is less than 0.01%
Triethylene glycol enters rectifying column 8 after being heated to about 175 DEG C, and heating is to steam absorbed moisture, capital vapor under micro-positive pressure
Through silk screen foam removal, the cooling of air cooler 12, condensed water surge tank 13, gas is drawn by tank deck is used as generative fuel gas, and liquid then passes through
Sewage header is led to out-of-bounds.
Poor triethylene glycol after regeneration flows into triethylene glycol reboiler 9 by 8 stripping section of rectifying column, and extremely through 10 enrichment of air lift column
After 99.3%, into reboiler surge tank 11.The poor triethylene glycol of high temperature drawn from reboiler surge tank 11 is changed through lean/rich triethylene glycol
After hot device 7 recycles heat, after temperature is down to 80 DEG C or less, radiates using finned tube, into triethylene glycol circulating pump 5, be pressurized to
Out-of-bounds absorption plant is sent to after 9.8MPaG.
Dehydrated natural gas, into fuel gas surge tank 3, converges, and pass through from out-of-bounds with 2 top gas of triethylene glycol flash tank
After direct-operated regulator decompression mixes after being 5~10kPaG with 13 top gas of condensed water surge tank again, into burner 14,
High-temperature flue gas is generated, poor triethylene glycol is to 200 DEG C in fire tube type heat exchanger heating reboiler, and low-temperature flue gas is then by being vented after heat exchange
Cylinder discharge.
To ensure the normal operation of device after tail gas introducing burner 14 at the top of condensate liquid surge tank, increase in air lift gas pipeline
If restriction orifice, ensure that maximum stream flow is no more than 50Nm3/ h, so that it is guaranteed that the tail gas at the top of condensate liquid surge tank does not exceed combustion
Expect gas dosage；It is added simultaneously in 13 high point of condensed water surge tank and stop valve is set on exhaust line, interlocked with reboiler high-temperature,
Accident conditions (when overtemperature), 14 solenoid valve of burner are closed, tail gas discharging directly into atmosphere, and turn off fuel gas, and temperature is reduced to normally
Operating mode, 14 solenoid valve of burner are opened, and tail gas enters burner 14 together with fuel gas.
To ensure that the poor glycol mass concentration after regenerating 99% or more, also needs to be aided with air lift.
Gas stripping gas is from dehydrated natural gas out-of-bounds, first after reboiler preheats, air lift column 10 is passed into, for stirring
Glycol solution makes the vapor being trapped in high viscosity solution escape, while also reducing steam partial pressure, and more water is made to steam
Gas steams, to further increase the concentration of poor glycol.
Claims (6)
1. a kind of processing method of triethylene glycol dehydration regeneration air lift tail gas, including triethylene glycol regeneration technology, it is characterised in that：Three is sweet
Rich triethylene glycol enters triethylene glycol flash tank in alcohol regeneration technology, isolates absorbed hydrocarbon gas under low pressure, and flashed vapour is used
Make generative fuel gas；
It is lean/rich that rich triethylene glycol after flash distillation removes liquid, the entrance such as heavy hydrocarbon, chemical agent and lubricating oil through active carbon filter successively
Triethylene glycol heat exchanger enters rectifying column after heating, capital vapor is through silk screen foam removal, air cooler cooling, condensed water surge tank, gas
Body is drawn by tank deck is used as generative fuel gas, and liquid is then led to out-of-bounds through sewage header；
Poor triethylene glycol after regeneration flows into triethylene glycol reboiler by rectifying column stripping section, and is used through air lift column, dehydrated natural gas
After air lift enrichment, into reboiler surge tank, the poor triethylene glycol of high temperature drawn from reboiler surge tank exchanges heat through lean/rich triethylene glycol
After device recycles heat, radiates using finned tube, into triethylene glycol circulating pump, out-of-bounds absorption plant is sent to after supercharging；
After regeneration air lift tail gas enters condensed water surge tank separation liquid water, converge into combustion with triethylene glycol flash drum overhead gas
It after expecting gas surge tank, burns into reboiler burner together with fuel natural gas, generates high-temperature flue gas, changed through fire-tube type
Poor triethylene glycol in hot device heating reboiler, low-temperature flue gas is then discharged by exhaust tube after heat exchange；
Air lift gas pipeline is equipped with restriction orifice, it is ensured that the tail gas at the top of condensate liquid surge tank does not exceed fuel gas dosage, condensation
Water surge tank high point, which is added, is arranged stop valve on exhaust line, interlocked with reboiler high-temperature, and when overtemperature, burner solenoid valve closes
It closes, temperature is reduced to nominal situation, burner solenoid valve to open, and tail gas enters burner together with fuel gas.
2. a kind of processing method of triethylene glycol dehydration regeneration air lift tail gas according to claim 1, it is characterised in that：It comes from
The rich triethylene glycol for absorbing sledge removes 5 μm or more of solid impurity through level-one mechanical filter, then enters the tower at the top of rectifying column
Condenser is pushed up, triethylene glycol flash tank is entered after being preheated to 55 DEG C.
3. a kind of processing method of triethylene glycol dehydration regeneration air lift tail gas according to claim 2, it is characterised in that：Flash distillation
Rich triethylene glycol afterwards successively after active carbon filter removes the liquid such as heavy hydrocarbon, chemical agent and lubricating oil through secondary filter again
Remove 5 μm or more of solid impurity.
4. a kind of processing method of triethylene glycol dehydration regeneration air lift tail gas according to claim 2, it is characterised in that：Into
The rich triethylene glycol of lean/rich triethylene glycol heat exchanger exchanges heat with the poor triethylene glycol of high temperature to 175 DEG C.
5. a kind of processing method of triethylene glycol dehydration regeneration air lift tail gas according to claim 2, it is characterised in that：From weight
The poor triethylene glycol of high temperature of device surge tank extraction is boiled after lean/rich triethylene glycol heat exchanger recycles heat, and temperature is down to 80 DEG C or less.
6. a kind of processing method of triethylene glycol dehydration regeneration air lift tail gas according to claim 5, it is characterised in that：Three is sweet
Poor triethylene glycol is pressurized to after 9.8MPaG and is sent to out-of-bounds absorption plant by alcohol circulating pump.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810082863.6A CN108641763A (en) | 2018-01-29 | 2018-01-29 | A kind of processing method of triethylene glycol dehydration regeneration air lift tail gas |
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| CN201810082863.6A CN108641763A (en) | 2018-01-29 | 2018-01-29 | A kind of processing method of triethylene glycol dehydration regeneration air lift tail gas |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111732981A (en) * | 2020-06-10 | 2020-10-02 | 中国石油天然气集团有限公司 | Flash evaporation gas decarburization dehydration method and device based on membrane separation |
| CN112742184A (en) * | 2021-01-06 | 2021-05-04 | 中国石油天然气股份有限公司 | Triethylene glycol dehydration device and method for recycling regeneration waste gas |
| CN113278456A (en) * | 2021-06-25 | 2021-08-20 | 西南石油大学 | Triethylene glycol regenerating unit for pressure boost dehydration station |
| CN113457357A (en) * | 2021-05-27 | 2021-10-01 | 中国石油天然气股份有限公司西南油气田分公司重庆气矿 | Tail gas deodorization process and device for triethylene glycol dehydration |
| CN114191836A (en) * | 2020-09-02 | 2022-03-18 | 中国石油天然气股份有限公司 | Triethylene glycol dewatering device and natural gas dewatering system |
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| CN105854531A (en) * | 2016-06-17 | 2016-08-17 | 中石化节能环保工程科技有限公司 | Closed triethylene glycol dehydration system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111732981A (en) * | 2020-06-10 | 2020-10-02 | 中国石油天然气集团有限公司 | Flash evaporation gas decarburization dehydration method and device based on membrane separation |
| CN111732981B (en) * | 2020-06-10 | 2021-06-08 | 中国石油天然气集团有限公司 | Flash evaporation gas decarburization dehydration method and device based on membrane separation |
| CN114191836A (en) * | 2020-09-02 | 2022-03-18 | 中国石油天然气股份有限公司 | Triethylene glycol dewatering device and natural gas dewatering system |
| CN112742184A (en) * | 2021-01-06 | 2021-05-04 | 中国石油天然气股份有限公司 | Triethylene glycol dehydration device and method for recycling regeneration waste gas |
| CN113457357A (en) * | 2021-05-27 | 2021-10-01 | 中国石油天然气股份有限公司西南油气田分公司重庆气矿 | Tail gas deodorization process and device for triethylene glycol dehydration |
| CN113278456A (en) * | 2021-06-25 | 2021-08-20 | 西南石油大学 | Triethylene glycol regenerating unit for pressure boost dehydration station |
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