CN212964236U

CN212964236U - Cracked gas sampler

Info

Publication number: CN212964236U
Application number: CN202021563223.6U
Authority: CN
Inventors: 王鹏; 贠建华; 王文彬; 张剑; 郭岩锋
Original assignee: China Petroleum and Chemical Corp; Qilu Petrochemical Co of Sinopec
Current assignee: China Petroleum and Chemical Corp; Qilu Petrochemical Co of Sinopec
Priority date: 2020-07-31
Filing date: 2020-07-31
Publication date: 2021-04-13
Anticipated expiration: 2030-07-31

Abstract

A cracked gas sampler belongs to the technical field of cracked gas sampling. In order to understand the process operation condition of the ethylene cracking furnace and to grasp and adjust the process parameters in time, the yield of the cracked product needs to be analyzed. In the prior art, a sampler generally has the defects of slow and unstable heat exchange, incapability of controlling the heat exchange temperature to ensure the repeatability, incapability of realizing on-site effective separation of a liquid-phase product and process water and requirement on subsequent treatment; or multi-stage cooling heat exchange, low control precision, poor result repeatability and the like. The utility model provides a pyrolysis gas sampler comprises cooling separation mechanism (1), oil water separator (2), weighing bottle (3), weighing mechanism (4), dry-type gas flowmeter (5), controller (6) and frame (12), can effectual separation pyrolysis gas and control sampling temperature, improves the repeatability of experiment when improving accurate nature to greatly reduced operating personnel's work load.

Description

Cracked gas sampler

Technical Field

A cracked gas sampler belongs to the technical field of cracked gas sampling.

Background

In order to understand the process operation condition of the ethylene cracking furnace and to grasp and adjust the process parameters in time, the yield of the cracked product needs to be analyzed. Although some ethylene plants are equipped with on-line chromatographic analysis sampling devices for cracked gas, only a small part of the gas phase components in the cracked gas can be analyzed, and the cracking depth is examined according to the mass ratio of propylene to ethylene.

Along with the reduction of material temperature, gas-liquid phase coexistence and instability of pyrolysis products in the sampling process, if separation is not thorough, light components are lost, liquid phase loss and gas metering are inaccurate, the measurement accuracy of the pyrolysis components is reduced, and the calibration result is influenced. Because the difficulty in sampling and analyzing the cracking products is high, the real distribution situation of the cracking products is difficult to reflect, and most ethylene plants do not carry out full analysis on the cracking products, so that the process conditions of a single cracking furnace cannot be optimized.

In the prior art, a sampler generally has the problems that heat exchange is slow and unstable, the heat exchange temperature cannot be controlled to ensure the repeatability, the on-site effective separation of a liquid-phase product and process water cannot be realized, and the follow-up treatment is required; or multi-stage cooling heat exchange, low control precision, poor result repeatability and the like.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: the defects of the prior art are overcome, and the cracked gas sampler is provided, can control the cooling heat exchange temperature, has good repeatability, is convenient to use and move, and can separate samples on site.

The utility model provides a technical scheme that its technical problem adopted is:

a cracked gas sampler, comprising: comprises a cooling separation mechanism, an oil-water separator, a weighing bottle, a weighing mechanism, a dry-type gas flowmeter, a controller and a frame.

The cooling separation mechanism, the oil-water separator and the weighing mechanism are sequentially fixed on the frame from top to bottom, the weighing bottle is placed on the weighing mechanism, and the controller is fixed outside the frame and connected with and controls the cooling separation mechanism and the oil-water separator; the sampling pipeline passes through the cooling separation mechanism and the oil-water separator in sequence and then is communicated into the weighing bottle, and the dry-type gas flowmeter is connected with the sampling pipeline in the cooling separation mechanism through a pipeline and is communicated to the outside of the frame.

The cooling and separating mechanism comprises a separator tank body, a semiconductor refrigerating piece is arranged on the outer side of the separator tank body and connected with the controller, and the cold end of the semiconductor refrigerating piece is attached to the outer side of the separator tank body.

The outer side of the oil-water separator is connected with an ultrasonic vibrator, and the ultrasonic vibrator is connected to the controller.

The cooling and separating mechanism is started for refrigeration firstly during sampling, the weighing mechanism is opened, the obtained high-temperature cracking gas can sequentially pass through the inlet ball valve to control the gas inlet speed, the inlet three-way valve enters a sampling pipeline, the cooled liquid is deposited at the bottom of the cooling and separating mechanism in the cooling and separating mechanism, the gas passes through the pipeline from the dry gas flowmeter and the gas sampling three-way valve firstly, the gas sampling three-way valve is communicated with the gas sampling ball valve, the gas sample is taken by controlling the speed through the gas sampling ball valve, the direction of the dry gas flowmeter is switched to the direction of the three-way valve after the gas sample is taken, the rest gas enters the inlet of the bottom dry gas flowmeter through the silicone tube to meter the accumulated flow, and the gas is emptied. The dry gas flowmeter is portable, small in size, light in weight and capable of displaying gas temperature.

The liquid phase sample cooled by the cooling and separating mechanism is controlled by the first ball valve at the bottom and flows into the oil-water separator through the sampling pipeline, under the action of ultrasonic waves, oil and water are effectively separated and deposited at the bottom of the oil-water separator, the second ball valve below the oil-water separator is opened after the separation is finished, the water phase at the lower layer flows into the weighing bottle, the water weight is weighed, then the weighing bottle is replaced, and the oil weight is weighed.

Preferably, the sampling line spirals downward in the cold separator. The time and the heat exchange effect of the sample in the cooling separation mechanism are increased, the pyrolysis gas can reach the required temperature, and the sampling experiment is quicker and more accurate.

Preferably, the bottom of the cooling and separating mechanism is also provided with a liquid collecting kettle which is connected with a sampling pipeline and a pipeline from a dry gas flowmeter. The added liquid collection kettle can effectively prolong the stay time of the sample in the cooling separation mechanism, ensure that the sample reaches the specified temperature, increase the sampling amount at one time and obtain more gas samples.

Preferably, the cooling jacket of the cooling separation mechanism also contains a refrigerant. The refrigerant can make the pre-cooling effect of the cooling and separating mechanism more rapid. The refrigeration efficiency is improved.

Preferably, a thermocouple is arranged at the upper part of the cooling and separating mechanism and is connected to the controller. The thermocouple can make accurate demonstration of temperature on the controller, makes operating personnel clarify the real-time temperature in the sampler, improves the precision of sample, increases the repeatability of experiment.

Preferably, the weighing bottle is made of transparent glass materials, so that a water-oil interface can be observed conveniently.

Preferably, the weighing mechanism is an electronic balance, and is powered by a dry battery, so that the replacement and maintenance are convenient, and the circuit problem is reduced.

Preferably, the cooling separation mechanism is further provided with a cooling jacket at the outer side, a cooling medium is arranged at the inner side of the cooling jacket, and the cold end of the semiconductor refrigeration sheet is attached to the outer side of the cooling jacket. The refrigerant can enable the precooling effect of the cooling and separating mechanism to be quicker, and the refrigeration efficiency is improved.

Compared with the prior art, the utility model provides a cracked gas sampler which has high integration degree and can accurately cool, separate and measure; the cooling separation mechanism is used for effectively cooling and separating the pyrolysis gas, and is convenient to operate and accurate to control; the temperature indication can clearly and definitely carry out refrigeration regulation, so that the refrigeration effect is met, and the repeatability of the experiment is improved; the oil-water separator effectively separates water and oil by using the cavitation effect of ultrasonic waves, and the water-oil separation interface is clear, so that the separation operation is convenient; the separation and weighing of water and oil can be completed on site, the operation steps are reduced, the metering is accurate, the result of a general sample can be known on site, the round trip time is avoided, and the sampling efficiency is improved; the sampler integration degree is high, and it is convenient to remove, the sampling personnel's that significantly reduces work load.

Drawings

FIG. 1 is a schematic diagram of a cracked gas sampler as described in example 1.

Fig. 2 is a schematic diagram of a cracked gas sampler as described in example 2.

Wherein, 1, a cooling and separating mechanism; 2. an oil-water separator; 3. weighing a bottle; 4. a weighing mechanism; 5. a dry gas flow meter; 6. a controller; 7. a semiconductor refrigeration sheet; 8. an ultrasonic vibrator; 9. a thermocouple; 10. a gas sampling ball valve; 11. a gas sampling three-way valve; 12. a frame; 13. an inlet three-way valve; 14. an inlet ball valve; 15. a first ball valve; 16. a second ball valve; 17. and (4) a liquid collecting kettle.

Detailed Description

Fig. 1 to 2 are preferred embodiments of the present invention, and the present invention will be further explained with reference to fig. 1 to 2.

Example 1

Referring to fig. 1, a cracked gas sampler comprises a cooling separation mechanism 1, an oil-water separator 2, a weighing bottle 3, a weighing mechanism 4, a dry gas flowmeter 5, a controller 6, a thermocouple 9 and a frame 12;

the cooling separation mechanism 1 and the oil-water separator 2 are respectively fixed on the upper part and the middle part of the frame 12, the weighing mechanism 4 and the dry-type gas flowmeter 5 are fixed at the bottom of the frame 12, the weighing bottle 3 is arranged on the weighing mechanism 4, and the controller 6 is fixed outside the frame 12 and is connected with and controls the cooling separation mechanism 1 and the oil-water separator 2.

The sampling pipeline passes through the cooling separation mechanism 1 and the oil-water separator 2 in sequence and is communicated into the weighing bottle 3, and the dry-type gas flowmeter 5 is connected with the bottom of the cooling separation mechanism 1 and the outside of the cracking gas sampler through pipelines.

The cooling separation mechanism 1 is provided with an external cooling jacket which is closed, a refrigerant is arranged in the cooling jacket, a semiconductor refrigeration sheet 7 is arranged on the outer side of the cooling jacket, two ends of the semiconductor refrigeration sheet 7 are connected with the controller 6, the cold end of the semiconductor refrigeration sheet is attached to the outer wall of the cooling separation mechanism 1, and the hot end of the semiconductor refrigeration sheet is connected with a cooling fan for cooling.

And a thermocouple 9 is further arranged on the upper part of the cooling and separating mechanism 1 and connected to a controller, and displays the real-time temperature in the cooling and separating mechanism 1. An oil-water separator 2 is arranged below the cooling separation mechanism, and the outer side of the cooling separation mechanism is connected with an ultrasonic vibrator 8 which is connected to a controller 6. The weighing mechanism 4 is an electronic balance and is powered by a dry battery.

When sampling, the cooling separation mechanism 1 is started to refrigerate firstly, the weighing mechanism 4 is opened, the obtained high-temperature cracking gas can sequentially pass through the inlet ball valve 14 to control the air inlet speed and the inlet three-way valve 13 and enter a sampling pipeline, the liquid is deposited at the bottom of the sampling pipeline in the cooling separation mechanism 1 after being cooled in the cooling separation mechanism 1, the gas passes through the pipeline from the dry-type gas flowmeter 5 and firstly passes through the gas sampling three-way valve 11, the gas sampling three-way valve 11 is communicated to the gas sampling ball valve 10, the gas sample is taken by controlling the speed through the gas sampling ball valve 10, the three-way valve is switched to the direction of the dry-type gas flowmeter 5 after the gas sample is finished, other gases enter the inlet of the bottom dry-type gas flowmeter 5 through the silicone tube to meter the accumulated flow. The dry gas flowmeter 5 is portable, has small volume and light weight, and can display the gas temperature.

The liquid phase sample cooled by the cooling separation mechanism 1 is controlled by the first ball valve 15 at the bottom and flows into the oil-water separator 2 through a sampling pipeline, under the action of ultrasonic waves, oil and water are effectively separated and deposited at the bottom of the oil-water separator 2, the second ball valve 16 below the oil-water separator is opened after the separation is finished, the lower water phase flows into the weighing bottle 3, the water weight is weighed, then the weighing bottle 3 is replaced, and the oil weight is weighed.

Example 2

Referring to fig. 2, in the cracked gas sampler of the present embodiment, the sampling line in the cooling separation mechanism 1 is provided in a coil shape. And a liquid collection kettle 17 is arranged at the bottom end of the coil pipe. The retention time of the sample in the cooling and separating mechanism 1 is greatly increased, more cracked gas is condensed and collected in the liquid collecting kettle, so that the quantity of non-condensable gas can be increased, and the sampling quantity of each time, particularly the sampling quantity of the gas is obviously increased.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims

1. A cracked gas sampler, comprising: comprises a cooling separation mechanism (1), an oil-water separator (2), a weighing bottle (3), a weighing mechanism (4), a dry-type gas flowmeter (5), a controller (6) and a frame (12);

the cooling separation mechanism (1), the oil-water separator (2) and the weighing mechanism are sequentially fixed on the frame (12) from top to bottom, the weighing bottle (3) is placed on the weighing mechanism (4), and the controller (6) is fixed outside the frame (12) and is connected with and controls the cooling separation mechanism (1) and the oil-water separator (2);

the sampling pipeline sequentially passes through the cooling separation mechanism (1) and the oil-water separator (2) and then is communicated into the weighing bottle (3), and the dry gas flowmeter (5) is connected with the sampling pipeline in the cooling separation mechanism through a pipeline and is communicated to the outside of the frame;

the cooling and separating mechanism (1) comprises a separator tank body, a semiconductor refrigerating sheet (7) is arranged on the outer side of the separator tank body, the semiconductor refrigerating sheet (7) is connected with the controller (6), and the cold end of the semiconductor refrigerating sheet (7) is attached to the outer side of the separator tank body;

the outer side of the oil-water separator (2) is connected with an ultrasonic vibrator (8), and the ultrasonic vibrator (8) is connected to the controller (6).

2. The cracked gas sampler of claim 1, wherein: the sampling pipeline is coiled downwards in the cooling separation mechanism (1).

3. The cracked gas sampler of claim 1, wherein: the bottom of the cooling and separating mechanism (1) is also provided with a liquid collecting kettle (17); the liquid collection kettle (17) is connected with a sampling pipeline and a pipeline from the dry gas flowmeter (5).

4. The cracked gas sampler of claim 1, wherein: and a thermocouple (9) is installed on the upper part of the cooling and separating mechanism (1), and the thermocouple (9) is connected to the controller (6).

5. The cracked gas sampler of claim 1, wherein: the weighing bottle (3) is made of transparent glass.

6. The cracked gas sampler of claim 1, wherein: the weighing mechanism (4) is an electronic balance and is powered by a dry battery.

7. The cracked gas sampler of claim 1, wherein: the outer side of the cooling separation mechanism (1) is also provided with a cooling jacket, the inner side of the cooling jacket is provided with a cooling medium, and the cold end of the semiconductor refrigeration sheet (7) is attached to the outer side of the cooling jacket.