CN216559121U - Device for measuring feeding flow during cracking of light hydrocarbon - Google Patents
Device for measuring feeding flow during cracking of light hydrocarbon Download PDFInfo
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- CN216559121U CN216559121U CN202220166491.7U CN202220166491U CN216559121U CN 216559121 U CN216559121 U CN 216559121U CN 202220166491 U CN202220166491 U CN 202220166491U CN 216559121 U CN216559121 U CN 216559121U
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Abstract
The utility model discloses a device for measuring the flow rate of a feed liquid during cracking of light hydrocarbon, which belongs to the technical field of chemical instrument equipment and comprises a flow measuring element and a first differential pressure transmitter, wherein the first differential pressure transmitter is provided with a first three-valve group, two Tube pressure leading pipes are arranged between the first differential pressure transmitter and the flow measuring element, the flow measuring element is obliquely and upwards provided with a pair of a first hole and a second hole, the lower part of the Tube pressure leading pipe is communicated with the first hole, the lower part of the Tube pressure leading pipe is communicated with the second hole, the lower parts of the Tube pressure leading pipe and the Tube pressure leading pipe are respectively provided with a first stop valve and a second stop valve, the upper parts of the Tube pressure leading pipe and the Tube pressure leading pipe are respectively communicated with the first pipeline and the second pipeline, and the first pipeline and the second pipeline are communicated with the first three-valve group, so that the technical problem of inaccurate measurement of the existing instrument is solved, and the device is mainly applied to feed measurement in the chemical production process.
Description
Technical Field
The utility model belongs to the technical field of chemical instrument equipment, and particularly relates to a feeding flow measuring device during light hydrocarbon cracking.
Background
At present, the feeding flow of most ethylene device cracking furnaces in the world is measured and controlled by adopting a mode that a standard orifice plate or a Venturi tube is configured with a differential pressure transmitter, and the flow measurement mode has the characteristics of low investment cost, simple measurement principle, easiness in maintenance and the like, and is widely applied to flow measurement in the ethylene industry.
The cracking furnace feeding is generally to mix raw materials such as naphtha or light raw materials and dilution steam according to a certain proportion, because the steam that contains a certain proportion in the inflow rate, very easily takes place to measure the medium condensation in the actual measurement process, causes to measure the medium and has phase state unstability, and then leads to the flow measurement to appear the technical problem that the deviation is big or the fluctuation is big.
Ethylene unit pyrolysis furnace feed flow deviation is big or undulant big general the adoption is carried out regularly row by instrument personnel and is congealed, increase instrument personnel daily maintenance work load, and flow measurement is inaccurate then lead to the pyrolysis furnace feed can't put into operation automatic control, lead to technology operation personnel to supervise a set intensity of labour greatly increased, thereby can't compromise the normal control of pyrolysis furnace, cause the pyrolysis furnace operating cycle short, frequently switch the pyrolysis furnace, thereby influence the benefit of enterprise's production, for satisfying the long period operation of pyrolysis furnace, reduce instrument personnel and technology personnel and supervise a set and maintain intensity, need optimize and improve pyrolysis furnace feed flow mounting means and solve technical problem among the prior art.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems in the background art, the utility model provides a feed flow measuring device for light hydrocarbon cracking, which adopts the following technical scheme:
the device for measuring the feed flow during light hydrocarbon cracking comprises a flow measuring element and a first differential pressure transmitter, wherein the measuring element can be a Venturi Tube, a first three-valve set is arranged on the first differential pressure transmitter, a feed inlet and a discharge outlet are arranged on the measuring element, a throat is arranged in the middle of the measuring element, and the diameter of the throat is smaller than that of the feed inlet and that of the discharge outlet, and the device is characterized in that two Tube pressure leading pipes are arranged between the first differential pressure transmitter and the flow measuring element and are respectively a Tube pressure leading pipe I and a Tube pressure leading pipe II, the flow measuring element is obliquely and upwards provided with a pair of holes which are respectively a hole I and a hole II, the lower part of the Tube pressure leading pipe I is communicated with the hole I, the lower part of the Tube pressure leading pipe II is communicated with the hole II, the hole I is positioned in the front part of the feed inlet, the hole II is positioned at the throat without a measuring part, and the lower parts of the Tube pressure leading pipe I and the Tube II are respectively provided with a first stop valve and a second stop valve II, the utility model discloses a pressure pipe, including pipe one, pipe two is equipped with blowoff valve one and blowoff valve two, pipe one draw to press pipe one and pipe two to draw to press pipe two to communicate with pipeline one and pipeline two respectively, pipeline one and pipeline two be linked together with three valves one, wherein pipe draw to press the middle section part that pipe one and pipe two to be 90 degrees with the horizontal direction, at this moment in the normal measurement process, in case take place to measure the medium condensation, the medium after the condensation can flow back to in the technology pipeline because gravity to can not influence and measure numerical value, thereby can guarantee the normal operating of equipment.
Preferably: in order to better measure the flow of different media, a second differential pressure transmitter is further arranged, the first differential pressure transmitter and the second differential pressure transmitter have different measuring ranges, a second three-valve set is arranged on the second differential pressure transmitter, two Tube pressure pipes are arranged between the second differential pressure transmitter and a flow measuring element and are respectively a Tube pressure pipe third and a Tube pressure pipe fourth, the flow measuring element is obliquely and upwards provided with a pair of holes which are respectively a hole third and a hole fourth, the lower part of the Tube pressure pipe third is communicated with the hole three phase, the lower part of the Tube pressure pipe fourth is communicated with the hole four phase, the hole three position is positioned in front of a feed port, the hole four position is positioned in a throat part without measuring part, the lower parts of the Tube pressure pipe third and the Tube pressure pipe fourth are respectively provided with a stop valve third and a stop valve fourth, the upper parts of the Tube pressure pipe third and the Tube pressure pipe fourth are respectively communicated with a pipeline third and a pipeline four phase, the pipeline III and the pipeline IV are communicated with the three-valve group and the two-valve group, the middle section parts of the Tube III and the Tube IV are 90 degrees to the horizontal direction, the flow of different media can be measured through the design, and the Tube between the differential pressure transmitter and the flow measurement element is as short as possible in the design process.
The utility model has the beneficial effects that: the method meets the requirement of stable feed flow measurement of the cracking furnace of the light hydrocarbon cracking device, and can effectively solve the problem of large deviation or large fluctuation of the indication value of the feed flow measurement mode of the conventional cracking furnace; meanwhile, the flowmeter has simple installation mode, saves material investment, is convenient to operate and maintain, is very suitable for a device for preparing olefin by cracking light hydrocarbon, is suitable for comprehensive popularization and application, and can meet the requirement of measuring flow rate of different media, the input cost can be saved by the design of the utility model, 1 set of light hydrocarbon cracking device is generally provided with 6 to 8 cracking furnaces, each cracking furnace is generally provided with 8 groups of feeding materials, 96 sets of cracking furnace feeding flow meters are arranged to 128 sets of cracking furnace feeding flow meters, each feeding flow meter is provided with an instrument heat preservation box according to the normal design, the installation position of the instrument is higher than a flow rate measurement element, a single flowmeter uses a Tube to lead pressure to be 10 to 15 meters, the number of the sleeve joints is 2 to 3, and instrument cables (1 multiplied by 2 multiplied by 1.5 mm) are arranged on the meter cable2) At 50-80 m, the instrument heat preservation box can be optimally removed according to the installation mode after modification, the Tube pressure guiding pipe of a single flowmeter is used at 1-2 m, the sleeve joints are arranged at 1, and the instrument cable (1 multiplied by 2 multiplied by 1.5 mm)2)10-30 meters, 96 to 128 instrument heat preservation boxes can be saved, 960 to 1280 meters of Tube can be saved, 200 to 260 ferrule joints can be saved, 4000 to 6500 meters of cable can be saved, and 48.8 to 68.4 ten thousand yuan of material cost can be saved in an accumulated way. Is suitable for comprehensive popularization and application.
Drawings
FIG. 1 is a first installation structure of the present invention;
fig. 2 is a second installation structure diagram of the present invention.
In the figure: 1 a measuring element; 1-1 feed inlet; 1-2 discharge ports; 1-3 holes I; 1-4 holes II; 1-5 holes III; 1-6 holes IV; 3, a first differential pressure transmitter; 3-1, a first valve group; 4, a differential pressure transmitter II; 4-1, a second valve bank; 5Tube pressure guiding Tube III; 5-1, a third stop valve; 5-2, a third blowdown valve; 5-3, a third pipeline; 6Tube pressure guiding Tube IV; 6-1, a stop valve IV; 6-2, a blowdown valve IV; 6-3, pipeline four; 7Tube I is pressed; 7-1, a first stop valve; 7-2, a first blowdown valve; 7-3, a first pipeline; 8Tube pressure guiding Tube IV; 8-1, a second stop valve; 8-2 of a second blowdown valve; 8-3, pipeline two.
Detailed Description
Example 1
As shown in fig. 1:
feed flow measuring device during light hydrocarbon pyrolysis, including flow measuring element 1 and differential pressure transmitter 3, be equipped with three valves on the differential pressure transmitter 3 one 3-1, be equipped with feed inlet 1-1 and discharge gate 1-2 on the measuring element 1, the centre of measuring element 1 be the throat, the diameter of throat be less than the diameter of feed inlet 1-1 and discharge gate 1-2 department, its characterized in that: two Tube pressure guiding pipes, namely a Tube pressure guiding pipe I7 and a Tube pressure guiding pipe II 8, are arranged between the differential pressure transmitter I3-1 and the flow measuring element 1, a pair of holes are formed in the flow measuring element 1 in an inclined upward direction and respectively comprise a hole I1-3 and a hole II 1-4, the lower part of the Tube pressure guiding pipe I7 is communicated with the hole I1-3, the lower part of the Tube pressure guiding pipe II 8 is communicated with the hole II 1-4, the hole I1-3 is positioned in the front of the feed inlet 1-1, the hole II 1-4 is positioned at the throat part of the measuring element-free pipe 1, the lower parts of the Tube pressure guiding pipe I7 and the Tube pressure guiding pipe II 8 are respectively provided with a stop valve I7-1 and a stop valve II 8-1, the upper parts of the Tube pressure guiding pipe I7 and the Tube pressure guiding pipe II 8 are provided with a blow-down valve I7-2 and a blow-down valve II 8-2, the first Tube 7 and the second Tube 2 are respectively communicated with a first Tube 7-3 and a second Tube 8-3, the first Tube 7-3 and the second Tube 8-3 are communicated with a first three-valve group 3-1, and the middle section parts of the first Tube 7 and the second Tube 8 form an angle of 90 degrees with the horizontal direction.
The working principle of the utility model is as follows: closing a positive pressure valve and a negative pressure valve of a three-valve group I3-1 of a differential pressure transmitter I3, and opening a balance valve; step two: opening a first stop valve I7-1 and a second stop valve I8-1 of the flow measurement element 1, observing whether joints of a Tube pressure guiding pipe I7 and a Tube pressure guiding pipe II 8 are leaked, and carrying out the next step if no leakage exists; step three: and when the first differential pressure transmitter is put into use, opening a positive pressure valve of the three valve groups I3-1 of the first differential pressure transmitter 3, closing a balance valve of the three valve groups I3-1 of the first differential pressure transmitter 3, and opening a negative pressure valve of the three valve groups I3-1 of the first differential pressure transmitter 3. Step four: and checking whether the gauge head of the transmitter indicates or not, and indicating whether the DCS control picture indicates to be normal or not, and if no problem exists, indicating that the flowmeter is successfully used.
Example 2
As shown in fig. 2:
feed flow measuring device during light hydrocarbon pyrolysis, including flow measuring element 1 and differential pressure transmitter 3, be equipped with three valves on the differential pressure transmitter 3 one 3-1, be equipped with feed inlet 1-1 and discharge gate 1-2 on the measuring element 1, the centre of measuring element 1 be the throat, the diameter of throat be less than the diameter of feed inlet 1-1 and discharge gate 1-2 department, its characterized in that: two Tube pressure guiding pipes, namely a Tube pressure guiding pipe I7 and a Tube pressure guiding pipe II 8, are arranged between the differential pressure transmitter I3-1 and the flow measuring element 1, a pair of holes are formed in the flow measuring element 1 in an inclined upward direction and respectively comprise a hole I1-3 and a hole II 1-4, the lower part of the Tube pressure guiding pipe I7 is communicated with the hole I1-3, the lower part of the Tube pressure guiding pipe II 8 is communicated with the hole II 1-4, the hole I1-3 is positioned in the front of the feed inlet 1-1, the hole II 1-4 is positioned at the throat part of the measuring element-free pipe 1, the lower parts of the Tube pressure guiding pipe I7 and the Tube pressure guiding pipe II 8 are respectively provided with a stop valve I7-1 and a stop valve II 8-1, the upper parts of the Tube pressure guiding pipe I7 and the Tube pressure guiding pipe II 8 are provided with a blow-down valve I7-2 and a blow-down valve II 8-2, the first Tube 7 and the second Tube 2 are respectively communicated with a first Tube 7-3 and a second Tube 8-3, the first Tube 7-3 and the second Tube 8-3 are communicated with a first three-valve group 3-1, and the middle section parts of the first Tube 7 and the second Tube 8 form an angle of 90 degrees with the horizontal direction. The device is also provided with a differential pressure transmitter II 4, the differential pressure transmitter II 4 is provided with a three-valve set II 4-1, two Tube pressure guiding pipes are arranged between the differential pressure transmitter II 4 and the flow measuring element 1, the Tube pressure guiding pipes are respectively Tube pressure guiding pipes III 5 and Tube pressure guiding pipes IV 6, the flow measuring element 1 is provided with a pair of holes in the inclined upward direction, the holes are respectively Tube three 1-5 and Tube four 1-6, the lower part of the Tube pressure guiding pipe III 5 is communicated with the holes three 1-5, the lower part of the Tube pressure guiding pipe IV 6 is communicated with the holes four 1-6, the holes three 1-3 are positioned at the front part of the feed inlet 1-1, the holes four 1-6 are positioned at the throat part of the measuring element-free part 1, the lower parts of the Tube pressure guiding pipe III 5 and the Tube pressure guiding pipe IV 6 are respectively provided with a block valve III 5-1 and a block valve IV 6-1, the upper parts of the Tube pressure guiding pipe III 5 and the Tube pressure guiding pipe IV 6 are respectively provided with a blow-2 and a blow-2, the Tube three 5 and the Tube four 6 are respectively communicated with a Tube three 5-3 and a Tube four 6-3, the Tube three 5-3 and the Tube four 6-3 are communicated with a three-valve group two 4-1, and the middle section parts of the Tube three 5 and the Tube four 6 are 90 degrees to the horizontal direction.
The working principle of the utility model is as follows: the first differential pressure transmitter 3 is used for large-range measurement, the pressure is 0-62.26Kpa and is mainly used for ethane feeding, the second differential pressure transmitter 4 is used for small-range measurement, the pressure is 0-6.26Kpa and is mainly used for low-pressure steam feeding, when the large-range measurement is required, the third stop valve 5-1 and the fourth stop valve 6-1 are closed, the first stop valve 1-3 and the second stop valve 1-4 are opened, when the small-range measurement is required, the third stop valve 5-1 and the fourth stop valve 6-1 are opened, the first half stop valve 1-3 and the second stop valve 1-4 are closed, under normal conditions, the first blow-off valve 7-2, the second blow-off valve 8-2, the third blow-off valve 5-3 and the fourth blow-off valve 6-2 are closed, and when the blow-off is required, the first blow-off valve 7-2, the second blow-off valve 7-2 and the fourth blow-off valve 6-2 are just opened, A second blowoff valve 8-2, a third blowoff valve 5-3 and a fourth blowoff valve 6-2.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (2)
1. Feed flow measuring device during light hydrocarbon pyrolysis, including flow measuring element (1) and differential pressure transmitter (3), be equipped with three valves one (3-1) on differential pressure transmitter (3), be equipped with feed inlet (1-1) and discharge gate (1-2) on measuring element (1), measuring element's (1) centre be the throat, the diameter of throat be less than the diameter of feed inlet (1-1) and discharge gate (1-2) department, its characterized in that: the differential pressure transmitter is characterized in that two Tube pressure leading pipes are arranged between the first differential pressure transmitter (3) and the flow measuring element (1), the Tube pressure leading pipes are respectively a Tube pressure leading pipe (7) and a Tube pressure leading pipe (8), the flow measuring element (1) is obliquely and upwards provided with a pair of holes, namely a hole I (1-3) and a hole II (1-4), the lower part of the Tube pressure leading pipe (7) is communicated with the hole I (1-3), the lower part of the Tube pressure leading pipe (8) is communicated with the hole II (1-4), the hole I (1-3) is positioned at the front part of the feeding port (1-1), the hole II (1-4) is positioned at the throat part of the measuring element (1), the lower parts of the Tube pressure leading pipe (7) and the Tube pressure leading pipe (8) are respectively provided with a stop valve I (7-1) and a stop valve II (8-1), and the upper parts of the Tube pressure leading pipe (7) and the Tube pressure leading pipe (8) are respectively provided with a blowdown valve I (7-2-1), and the drain valve II (8) ) And the blow-down valve II (8-2), the Tube I (7) and the Tube II (8) are respectively communicated with the Tube I (7-3) and the Tube II (8-3), the Tube I (7-3) and the Tube II (8-3) are communicated with the valve I (3-1), and the middle section parts of the Tube I (7) and the Tube II (8) are 90 degrees to the horizontal direction.
2. The device for measuring the feed flow during light hydrocarbon cracking according to claim 1, wherein a second differential pressure transmitter (4) is further provided, a second three-valve set (4-1) is arranged on the second differential pressure transmitter (4), two Tube pressure leading pipes are arranged between the second differential pressure transmitter (4) and the flow measuring element (1), the Tube pressure leading pipes are respectively a Tube pressure leading pipe third (5) and a Tube pressure leading pipe fourth (6), the flow measuring element (1) is obliquely and upwards provided with a pair of holes, namely a hole third (1-5) and a hole fourth (1-6), the lower part of the Tube pressure leading pipe third (5) is communicated with the hole third (1-5), the lower part of the Tube pressure leading pipe fourth (6) is communicated with the hole fourth (1-6), the hole third (1-5) is positioned at the front part of the feed port (1-1), and the hole fourth (1-6) is positioned at the throat part of the measuring element (1), the lower parts of the Tube three (5) and the Tube four (6) are respectively provided with a stop valve three (5-1) and a stop valve four (6-1), the upper parts of the Tube three (5) and the Tube four (6) are respectively provided with a blow-down valve three (5-2) and a blow-down valve four (6-2), the Tube three (5) and the Tube four (6) are respectively communicated with a Tube three (5-3) and a Tube four (6-3), the Tube three (5-3) and the Tube four (6-3) are communicated with a three-valve group two (4-1), and the middle section parts of the Tube three (5) and the Tube four (6) are 90 degrees with the horizontal direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220166491.7U CN216559121U (en) | 2022-01-21 | 2022-01-21 | Device for measuring feeding flow during cracking of light hydrocarbon |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220166491.7U CN216559121U (en) | 2022-01-21 | 2022-01-21 | Device for measuring feeding flow during cracking of light hydrocarbon |
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| Publication Number | Publication Date |
|---|---|
| CN216559121U true CN216559121U (en) | 2022-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220166491.7U Active CN216559121U (en) | 2022-01-21 | 2022-01-21 | Device for measuring feeding flow during cracking of light hydrocarbon |
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| Country | Link |
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| CN (1) | CN216559121U (en) |
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- 2022-01-21 CN CN202220166491.7U patent/CN216559121U/en active Active
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