CN103048168B - Device and method for collecting cracking gas in kettle-type coking process - Google Patents
Device and method for collecting cracking gas in kettle-type coking process Download PDFInfo
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- CN103048168B CN103048168B CN201110313841.4A CN201110313841A CN103048168B CN 103048168 B CN103048168 B CN 103048168B CN 201110313841 A CN201110313841 A CN 201110313841A CN 103048168 B CN103048168 B CN 103048168B
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Abstract
The invention discloses a device for collecting cracking gas in a kettle-type coking process. The device comprises a water storage tank, a gas storage tank, a flowmeter, an air intake valve, an air bleeding valve, a drain valve and a gas collecting valve, wherein the bottom of the water storage tank is connected with the bottom of the gas storage tank through a pipeline and is higher than the bottom of the gas storage tank, the drain valve is arranged on the pipeline for connecting the bottoms of the water storage tank and the gas storage tank, the water storage tank is connected with atmosphere through a top water inlet pipe, the air intake valve is a three-way valve, one end of the air intake valve is connected with the flowmeter through a pipeline, the other end of the air intake valve is connected with the top of the air storage tank through a pipeline, the air bleeding valve is arranged on the pipeline at the top of the gas storage tank and can be communicated with the flowmeter, and the flowmeter is connected with the gas collecting valve through a pipeline. The device is low in cost, suitable for application and simple in operation process and can automatically collect the cracking gas; and the cracking gas collected by the device can represent the average composition of all cracking gas generated in the coking reaction process.
Description
Technical field
The present invention relates to harvester and the gas production method of cracked gas in a kind of petroleum refining process, especially relate to harvester and the gas production method of the cracked gas in petroleum refining autoclave coking.
Background technology
In petroleum refining process, the processing and utilization of various heavy oil residue (or sump oil) is key subjects in petroleum refining industry.Coking be a kind of with heavy, poor residuum (or sump oil) for raw material, through the technique of degree of depth thermal cracking process gas, lightweight oil, gas oil and coke, be the Main Means of residual oil deep processing, in residual oil weight-lightening process, play irreplaceable effect.In autoclave coking test, owing to needing to calculate final material balance, therefore need to carry out composition analysis to the final cracked gas produced, the most accurate gas production method is all collected by all cracked gases produced, then gather a sample and carry out composition analysis again, but because the cracked gas accumulated amount produced is often huge, collect all gas to sample again and unrealistic, current autoclave coking test is mostly taked after reaction starts, gather a cracked gas sample sometime, the cracked gas representing cracking stage on average forms, a cracked gas sample is gathered sometime again in the burned stage, the cracked gas representing the burned stage on average forms, then mass spectrophotometry carried out to two samples and calculate the material balance of pyrogenetic reaction with this.Due in autoclave coking, along with the intensification of reaction depth, each time period cracked gas composition is widely different, the average composition of cooking gas can not be represented in gas production sometime, therefore the final material balance result yield calculated is on the low side, loss is comparatively large, has a strong impact on the accuracy of test findings.
CN201628642U discloses a kind of double-channel gas sampler, it comprises casing, and the pipe be located in casing is connected to the gas storehouse of air intake opening, velocimeter and pipe and is connected to air storage chamber between the two, gas storehouse is connected with air pump, described casing is provided with pipe connector, and inside this pipe connector, port tube is connected to velocimeter endpiece, external port pipe connects an air container.Be set to pipe connector in existing gas sampler exhaust ports, this pipe connector pipe connects the air container that is placed in outside; Inlet tube is connected to region to be detected, booster air pump, can gas to be detected is drawn in air container, the collection of gas to be measured can be completed, make originally only have the existing gas sampler gathering gas function to add the function of a collection gas.The equipment that the method needs is more, invest larger, and this gas production method can not solve in autoclave coking, each time period cracked gas composition differs greatly, the problem that experiment MaterialBalance Computation result yield is low, error is large that the average composition that gas production sometime can not represent cooking gas brings.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of device for gathering cracked gas in autoclave coking and gas production method.This installation cost is low, is suitable for application; The operating process of gas production method is simple, and can automatically gather, the cracked gas of collection can represent in pyrogenetic reaction process all cracked gases produced and on average form.
A kind of device for gathering cracked gas in autoclave coking, comprise water tank, gas-holder, flowmeter, gas admittance valve, vent valve, draining valve and gas production valve, the bottom of described water tank and gas-holder be connected by pipeline and the bottom of water tank higher than the bottom of gas-holder, associated line bottom water tank and gas-holder is provided with draining valve, water tank is connected with air by the water inlet pipe at top, described gas admittance valve is T-valve, one end is connected with flowmeter by pipeline, the other end is connected with gas-holder top by pipeline, the pipeline at gas-holder top is provided with vent valve and can be connected with flowmeter, flowmeter is connected with gas production valve by pipeline.
The present invention gathers in the device of cracked gas, can the water tank suitable according to how many selections gathering tolerance and gas-holder.
The present invention gathers in the device of cracked gas, and the bottom of described water tank is generally positioned at the middle and upper part of gas-holder, distance 1/3h-1/4h place, gas-holder top (h is the height of gas-holder).The present invention gathers in the device of cracked gas, and the internal diameter of affiliated water tank is generally the 1-2 of gas-holder internal diameter doubly, and preferred 1.2-1.6 doubly.
The present invention gathers in the device of cracked gas, and described gas admittance valve is three-way solenoid valve, can automatically sample like this.
Adopt said apparatus to carry out a method for cracked gas collection, comprise following content:
(1) in water tank, inject saturated aqueous common salt by the water inlet pipe at water tank top, saturated aqueous common salt enters into gas-holder by the associated line bottom water tank and gas-holder, stops injecting when saturated aqueous common salt is full of gas-holder;
(2) the coking cracked gas after deep cooling, gathers gas once by the every 0.1h ~ 5h of T-valve in water-filled gas-holder, and each gas production time is 1 ~ 20min;
(3), after gathering and terminating, open vent valve and gas production valve carries out gas production analysis, saturated aqueous common salt is reclaimed by draining valve.
In the method that cracked gas of the present invention gathers, the every 0.1h ~ 4h of described T-valve gathers gas once in gas-holder, and each gas production time is 5 ~ 10min.
Compared with prior art, the device and method tool that the present invention gathers cracked gas has the following advantages:
(1) device that the present invention gathers cracked gas can divide multiple time period to gather cracked gas, thus contain the composition characteristic of each time period cracked gas in coking, therefore the cracked gas of sampling analysis well can represent in whole coking all cracked gases produced and on average forms, solve that autoclave coked material balancing calculated yield is on the low side, product loss serious problems, thus improve the accuracy of final test findings;
(2) the present invention gathers the apparatus structure of cracked gas simply, and cost is low, practical;
(3) the present invention gathers the method for cracked gas, and each coking test only need adopt a cracked gas, analyzes a cracked gas sample, avoids the repeatability that repeatedly gas production is analyzed and the triviality analyzed after all collecting gas, raises labour efficiency.
Accompanying drawing explanation
Fig. 1 is the device gathering cracked gas in autoclave coking.
Wherein 1,3,5,7,8,10,13,14 is associated line, and 2 is three-way solenoid valve, and 4 is gas meter, and 6 is gas-holder, and 9 is water tank, and 11 is vent valve, and 12 is draining valve, and 15 is gas production valve.
Embodiment
Effect of the present invention is further illustrated below in conjunction with accompanying drawing.
Embodiment
The coking test of the present embodiment autoclave selects raw material to be certain refinery catalytic cracking slurry oil domestic, as long as its character and autoclave coking test process conditions are respectively in table 1, table 2, before on-test, in water tank 9, enough saturated aqueous common salts are injected by pipeline 10, saturated aqueous common salt is filled in gas-holder 6 via pipeline 8,7, gas-holder 6 is full of rear beginning coking test, coking cracked gas after deep cooling passes through three-way solenoid valve 2 by pipeline 1, then measured through gas meter 4 by pipeline 3, the coking gas after metering is discharged by 14 emptying through pipeline 13.The every 15min of three-way solenoid valve 2 automatically switches to pipeline 5 once, switching time is 2min, the oil gas being switched to pipeline 5 adopts draining to get gas method and collects gas in gas-holder 6, after coking test all terminates, open vent valve 11, in gas-holder 6, gas is by after vent valve 11, measure through gas meter 4, then discharged by 14 emptying through pipeline 13, in the process, open gas production valve 15, gather cracked gas sample and analyze, the coked material balancing result that cracked gas composition analysis result and thus cracked gas composition calculate is respectively in table 3 and table 4.
Comparative example
Coking test employing and embodiment same materials and coking technological condition, just after pyrogenetic reaction starts 8h, gather a gaseous sample, the burned stage gathers a sample after starting 1h, then composition analysis is carried out to sample, and calculating pyrogenetic reaction material balance result with this cracked gas composition, net result is respectively in table 3, table 4.
Table 1 feedstock oil character
| Title | Raw material |
| Density | 1.0795 |
| Acid number | 0.17 |
| Carbon residue | 6.74 |
| Condensation point DEG C | 18 |
| Adverse current viscosity 100 DEG C | 12.74 |
| C | 90.08 |
| H | 7.69 |
| S %(w) | 0.68 |
| N ppm | 2960 |
| Four composition | |
| Saturated part | 17.39 |
| Fragrance part | 76.33 |
| Colloid | 6.26 |
| Bituminous matter | 0.02 |
| Tenor | |
| Ca | 2.16 |
| Fe | 1.15 |
| Na | 0.15 |
| Ni | 0.39 |
Table 2 coking technological condition
| Coking technological condition | Parameter |
| Reaction pressure MPa | 1.5 |
| Green coke heating rate DEG C/h | 20 |
| Coking period h | 24 |
| Burned temperature DEG C | 520 |
| Burned time h | 4 |
Table 3 cracked gas composition analysis result
| Gas composition v% | Embodiment cracked gas | Comparative example cracked gas | The burned gas of comparative example |
| Methane | 39.41 | 42.87 | 52.37 |
| Ethane | 11.31 | 12.85 | 11.45 |
| Ethene | 3.02 | 3.17 | 1.71 |
| Propane | 3.21 | 4.96 | 4.01 |
| Propylene | 2.94 | 3.08 | 1.89 |
| Isobutane | 0.58 | 0.36 | 0.32 |
| Normal butane | 3.45 | 1.41 | 1.25 |
| Trans-2 butylene | 0.67 | 0.29 | 0.23 |
| Butene-1 | 0.69 | 0.67 | 0.5 |
| Isobutylene | 0.84 | 0.45 | 0.31 |
| Cis-2-butene | 0.68 | 0.25 | 0.15 |
| Isopentane | 0.77 | 0.21 | 0.23 |
| N-pentane | 0.82 | 0.5 | 0.59 |
| Trans-2 amylenes | 0.4 | 0.3 | 0.27 |
| 2-methyl-2 butylene | 0.34 | 0.13 | 0.44 |
| Amylene-1 | 0.38 | 0.22 | 0.12 |
| Cis-2-butene | 0.42 | 0.12 | 0.28 |
| Normal hexane | 0.85 | 0.28 | 1.03 |
| C6 | 2.75 | 1.63 | 1.6 |
| CO2 | 0.12 | 0.4 | 0.5 |
| H2 | 26.23 | 25.46 | 20.21 |
| N2 | 0.11 | 0.33 | 0.52 |
| CO | 0.01 | 0.05 | 0.02 |
| Add up to | 100 | 100.0 | 100.0 |
Table 4 material balance
| Project | Embodiment | Comparative example |
| Dry gas | 2.74 | 3.34 |
| Liquefied gas | 3.99 | 2.72 |
| C5 ~ C6 gas | 4.68 | 1.43 |
| Liquid yield | 66.63 | 66.63 |
| Coke yield | 20.27 | 20.27 |
| Loss | 1.69 | 5.61 |
| Add up to | 100.00 | 100.00 |
Claims (6)
1. the method for a cracked gas collection, it is characterized in that: cracked gas harvester comprises water tank, gas-holder, flowmeter, gas admittance valve, vent valve, draining valve and gas production valve, the bottom of described water tank and gas-holder be connected by pipeline and the bottom of water tank higher than the bottom of gas-holder, associated line bottom water tank and gas-holder is provided with draining valve, water tank is connected with air by the water inlet pipe at top, described gas admittance valve is T-valve, one end is connected with flowmeter by pipeline, the other end is connected with gas-holder top by pipeline, the pipeline at gas-holder top is provided with vent valve and can be connected with flowmeter, flowmeter is connected with gas production valve by pipeline, gatherer process is as follows: (1) injects saturated aqueous common salt by the water inlet pipe at water tank top in water tank, saturated aqueous common salt enters into gas-holder by the associated line bottom water tank and gas-holder, stop when saturated aqueous common salt is full of gas-holder injecting, (2) the coking cracked gas after deep cooling, gathers gas once by the every 0.1h ~ 5h of T-valve in water-filled gas-holder, and each gas production time is 1 ~ 20min, (3), after gathering and terminating, open vent valve and gas production valve carries out gas production analysis, saturated aqueous common salt is reclaimed by draining valve.
2. method according to claim 1, is characterized in that: the every 0.1h ~ 4h of described T-valve gathers gas once in gas-holder, and each gas production time is 5 ~ 10min.
3. method according to claim 1, is characterized in that: the bottom of described water tank is positioned at distance 1/3h-1/4h place, gas-holder top, and h is the height of gas-holder.
4. method according to claim 1, is characterized in that: the internal diameter of described water tank is 1-2 times of gas-holder internal diameter.
5. the method according to claim 1 or 4, is characterized in that: the internal diameter of described water tank is 1.2-1.6 times of gas-holder internal diameter.
6. method according to claim 1, is characterized in that: described gas admittance valve is three-way solenoid valve.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101424669A (en) * | 2008-12-11 | 2009-05-06 | 天津陆海石油设备系统工程有限责任公司 | Complete-releasing-light hydrocarbon automatic sample handling system |
| CN101676708A (en) * | 2008-09-19 | 2010-03-24 | 中国石油化工股份有限公司 | Portable NOx sampling device |
| TW201017148A (en) * | 2008-10-17 | 2010-05-01 | China Steel Corp | Continuous stream washing device for use in sample container |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101676708A (en) * | 2008-09-19 | 2010-03-24 | 中国石油化工股份有限公司 | Portable NOx sampling device |
| TW201017148A (en) * | 2008-10-17 | 2010-05-01 | China Steel Corp | Continuous stream washing device for use in sample container |
| CN101424669A (en) * | 2008-12-11 | 2009-05-06 | 天津陆海石油设备系统工程有限责任公司 | Complete-releasing-light hydrocarbon automatic sample handling system |
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