Determination system and method for all components of refinery gas

Abstract

The invention discloses a system and a method for determining all components of refinery gas, the system comprises a measuring system, the measuring system comprises a gas chromatograph, a combustion gas feeding assembly, a combustion-supporting gas feeding assembly, a carrier gas feeding assembly, an FID + TCD detector, a computer and a material feeding assembly, the combustion gas feeding assembly, the combustion-supporting gas feeding assembly, the carrier gas feeding assembly, the FID + TCD detector and the material feeding assembly are all connected with the gas chromatograph, the computer is connected with the FID + TCD detector, the gas chromatograph is used for carrying out component determination on refinery gas, the gas chromatograph is provided with the FID + TCD detector, the temperature of a column box is 90 DEG C, a split-flow sample injection mode is adopted, the temperature of the column box is 90 DEG C, and the temperature of the column box is 90 DEG C; one FID detector and two TCD detectors are adopted, the FID detector is used for measuring the content of C1-5, one TCD detector is used for measuring the content of nitrogen, carbon dioxide, hydrogen sulfide and carbonyl sulfide, the other TCD detector is used for measuring the content of hydrogen, traditional measurement after a large amount of gas is injected is replaced, and the measurement cost of the measurement system is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical instrument analysis industry, and in particular to a system and method for measuring all components of refinery gas. Background Art

[0002] Refinery gas is a by-product gaseous hydrocarbon produced during the processing of petroleum refineries, mainly from crude oil distillation, catalytic cracking, thermal cracking, petroleum coking, hydrocracking, catalytic reforming, hydrofining and other processes. Its main components include alkanes below C4, olefins, hydrogen and a small amount of nitrogen, carbon dioxide and other gases.

[0003] At present, the determination methods of refinery gas mainly include physical methods, chemical methods and instrumental analysis methods. The physical method is to analyze the composition and properties of the gas by measuring the physical properties of the gas such as density, volume, specific gravity, etc. The commonly used physical methods include: density method, which determines the composition of the gas by measuring the density of the gas; liquid level method, which uses the change of solubility of the gas in the liquid to analyze the gas composition; specific heat capacity method, which analyzes the composition of the gas by measuring the specific heat capacity of the gas; chemical method is to determine the composition and properties of the gas by chemical reaction between the gas and chemical reagents. Commonly used chemical methods include: absorption method, which passes the gas into the absorption liquid to absorb specific components, and then uses chemical methods to analyze the substances in the absorption liquid; gas chromatography, which separates and detects the gas through a gas chromatograph to determine the composition and content of the gas. The instrumental analysis method uses various gas analysis instruments to analyze refinery gas.

[0004] However, the traditional method for measuring refinery gas has the following disadvantages:

[0005] During the refinery gas measurement process, a large amount of gas is directly introduced for component identification. However, the more gas is used, the better. The use of a large amount of refinery gas increases its measurement cost. Summary of the invention

[0006] The object of the present invention is to provide a system and method for measuring all components of refinery gas, so as to solve the problem that in the process of refinery gas measurement proposed in the above background technology, a large amount of gas is directly poured into the gas for component identification, but the more gas is not necessarily better for measurement, and the use of a large amount of refinery gas increases its measurement cost.

[0007] To achieve the above object, the present invention provides the following technical solution: a system for measuring all components of refinery gas, comprising a measuring system, wherein the measuring system comprises a gas chromatograph, a combustion gas feed assembly, a combustion-supporting gas feed assembly, a carrier gas feed assembly, a FID+TCD detector, a computer and a material feed assembly, wherein the combustion gas feed assembly, the combustion-supporting gas feed assembly, the carrier gas feed assembly, the FID+TCD detector and the material feed assembly are all connected to the gas chromatograph, and the computer is connected to the FID+TCD detector;

[0008] The gas chromatograph determines the composition of refinery gas, the combustion gas feed assembly feeds the combustion gas required for detection, the combustion-supporting gas feed assembly feeds the combustion-supporting gas required for detection, the carrier gas feed assembly feeds the carrier gas required for detection, the FID+TCD detector uses five valves and seven columns to perform specific measurements on the composition, the computer visually displays and stores the measurement results, and the material feed assembly feeds the refinery gas.

[0009] As a preferred technical solution of the present invention, the FID+TCD detector includes a FID detector and two TCD detectors;

[0010] The FID detector measures the content of carbon 1 to carbon 5, one TCD detector measures the content of nitrogen and carbon dioxide, and the other TCD detector measures the content of hydrogen.

[0011] As a preferred technical solution of the present invention, the combustion gas feed assembly, the combustion-supporting gas feed assembly and the carrier gas feed assembly all include a gas tank and an air intake pipe, one side of the gas tank is fixedly connected to one end of the air intake pipe, the other side of the gas tank is provided with a pump body, one side of the pump body is provided with a quantitative shell, the interior of the quantitative shell is slidably connected with a quantitative plate, a lifting cylinder is fixedly installed in the middle of the top of the quantitative shell, the movable end of the lifting cylinder is fixedly connected to the middle of the top of the quantitative plate, a servo motor is fixedly installed on the top of the gas tank, and a stirring paddle located inside the gas tank is fixedly installed on the output end of the servo motor, the gas is injected into the gas tank through the air intake pipe, the pump body is started after being energized, the pump body extracts the gas in the gas tank through the extraction pipe, the extracted gas is transported to the quantitative shell through the connecting pipe, and finally transported to the gas chromatograph through the delivery pipe.

[0012] As a preferred technical solution of the present invention, the air inlet of the pump body is fixedly connected to an extraction pipe extending to the inside of the gas tank, the air outlet of the pump body is fixedly connected to a connecting pipe extending to the inside of a quantitative shell, the side of the quantitative shell away from the connecting pipe is fixedly connected to a delivery pipe, the side of the delivery pipe away from the quantitative shell is fixedly connected to a side facing the gas chromatograph, height rods slidably connected to the quantitative shell are fixedly installed on both sides of the top of the quantitative plate, the lifting cylinder performs telescopic movement, the lifting cylinder pushes the quantitative plate from the top, the quantitative plate slides relative to the quantitative shell, and the gas is quantified.

[0013] As a preferred technical solution of the present invention, the material feeding assembly includes a feed casing and a feed needle, the bottom end of the feed casing is fixedly connected to the top end of the feed needle, the inside of the feed casing is slidably connected with a piston plate, the top end of the piston plate is fixedly installed with a pull rod, the top end of the pull rod is fixedly installed with a movable platform, the top end of the feed casing is fixedly installed with a feed base, both sides of the top end of the feed base are fixedly installed with micro cylinders, the movable ends of the two micro cylinders are fixedly connected to the two sides of the bottom end of the movable platform, the micro cylinder performs telescopic movement, the micro cylinder pushes the movable platform from the bottom, and the movable platform pushes the piston plate to slide relative to the feed casing through the pull rod, so that the refinery gas in the feed casing is transported to the gas chromatograph through the feed needle.

[0014] As a preferred technical solution of the present invention, the bottom end of the feed needle is fixedly connected to a gas chromatograph.

[0015] The method for determining all components of refinery gas of the present invention comprises the following steps:

[0016] Step 1, gas feeding: the combustion gas feeding assembly, the combustion-supporting gas feeding assembly and the carrier gas feeding assembly are sequentially injected with the combustion gas, the combustion-supporting gas and the carrier gas;

[0017] Step 2, refinery gas feeding: the material feeding component adopts split flow to complete the refinery gas feeding;

[0018] Step 3: Component determination: FID+TCD detector and gas chromatograph are used to determine the components in the refinery gas;

[0019] Step 4: Result display: The results of the refinery gas composition determination are intuitively displayed on the computer.

[0020] As a preferred technical solution of the present invention, the combustion gas, combustion-supporting gas and carrier gas in step 1 are specifically combustion gas H 2 30 mL / min; combustion-supporting gas AIR 300 mL / min; carrier gas N 2 30 mL / min.

[0021] As a preferred technical solution of the present invention, the material feeding component in step 2 has an injection volume of 1.5 μL.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: the gas chromatograph is configured with: FID+TCD detectors, the column box temperature is 90°C and a split injection method is adopted, and 1 FID detector and 2 TCD detectors are adopted, the FID detector measures the content of carbon one to carbon five, 1 TCD measures the content of nitrogen and carbon dioxide, and the other TCD measures the hydrogen content, replacing the traditional measurement after a large amount of gas injection, thereby reducing the measurement cost of the measurement system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1It is a schematic diagram of the architecture of the measurement system of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the FID+TCD detector of the present invention;

[0025] Figure 3 is a cross-sectional view of a combustion gas feed assembly of the present invention;

[0026] Figure 4 is a three-dimensional diagram of the material feeding assembly of the present invention;

[0027] Figure 5 is a cross-sectional view of a material feeding assembly of the present invention;

[0028] Figure 6 is a flow chart of the present invention;

[0029] Figure 7 is a schematic diagram of the structure of the gas chromatograph of the present invention;

[0030] Figure 8 It is a schematic diagram of the detection result of the FID detector of the present invention;

[0031] Fig. 9 This is one of the schematic diagrams of the detection results of the TCD detector of the present invention;

[0032] Fig.10 This is the second schematic diagram of the detection results of the TCD detector of the present invention.

[0033] In the figure: 1. Gas chromatograph; 2. Combustion gas feed assembly; 201. Gas tank; 202. Inlet pipe; 203. Servo motor; 204. Agitator; 205. Extraction pipe; 206. Pump body; 207. Connecting pipe; 208. Quantitative shell; 209. Delivery pipe; 210. Quantitative plate; 211. Lifting cylinder; 212. Height rod; 3. Combustion gas feed assembly; 4. Carrier gas feed assembly; 5. FID+TCD detector; 51. FID detector; 52. TCD detector; 6. Computer; 7. Material feed assembly; 71. Feed casing; 72. Feed base; 73. Micro cylinder; 74. Movable table; 75. Pull rod; 76. Feed needle; 77. Piston plate; 8. Measuring system. DETAILED DESCRIPTION

[0034] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0035] See also Figure 1-10 The present invention provides a system for measuring all components of refinery gas, including a measuring system 8, wherein the measuring system 8 includes a gas chromatograph 1, a combustion gas feed assembly 2, a combustion-supporting gas feed assembly 3, a carrier gas feed assembly 4, a FID+TCD detector 5, a computer 6 and a material feed assembly 7, wherein the combustion gas feed assembly 2, the combustion-supporting gas feed assembly 3, the carrier gas feed assembly 4, the FID+TCD detector 5 and the material feed assembly 7 are all connected to the gas chromatograph 1, and the computer 6 is connected to the FID+TCD detector 5;

[0036] The gas chromatograph 1 measures the composition of the refinery gas, the combustion gas feed assembly 2 feeds the combustion gas required for detection, the combustion-supporting gas feed assembly 3 feeds the combustion-supporting gas required for detection, the carrier gas feed assembly 4 feeds the carrier gas required for detection, the FID+TCD detector 5 uses five valves and seven columns to measure the composition specifically, the computer 6 visually displays and stores the measurement results, and the material feed assembly 7 feeds the refinery gas.

[0037] The FID+TCD detector 5 includes a FID detector 51 and two TCD detectors 52;

[0038] The FID detector 51 measures the contents of carbon 1 to carbon 5, one TCD detector 52 measures the contents of nitrogen, carbon dioxide, hydrogen sulfide, and carbonyl sulfide, and another TCD detector 52 measures the content of hydrogen.

[0039] The combustion gas feed assembly 2, the combustion-supporting gas feed assembly 3 and the carrier gas feed assembly 4 all include a gas tank 201 and an air inlet pipe 202. One side of the gas tank 201 is fixedly connected to one end of the air inlet pipe 202. A pump body 206 is provided on the other side of the gas tank 201. A quantitative shell 208 is provided on one side of the pump body 206. A quantitative plate 210 is slidably connected to the interior of the quantitative shell 208. A lifting cylinder 211 is fixedly installed in the middle of the top of the quantitative shell 208. The movable end of the lifting cylinder 211 is connected to the top of the quantitative plate 210. The gas tank 201 is fixedly connected in the middle, a servo motor 203 is fixedly installed on the top of the gas tank 201, and a stirring paddle 204 located inside the gas tank 201 is fixedly installed at the output end of the servo motor 203. The gas is injected into the gas tank 201 through the air inlet pipe 202, and the pump body 206 is started after being energized. The pump body 206 extracts the gas in the gas tank 201 through the extraction pipe 205, and the extracted gas is transported to the quantitative shell 208 through the connecting pipe 207, and finally transported to the gas chromatograph 1 through the delivery pipe 209.

[0040] The air inlet of the pump body 206 is fixedly connected to an extraction pipe 205 extending to the inside of the gas tank 201, and the air outlet of the pump body 206 is fixedly connected to a connecting pipe 207 extending to the inside of the quantitative shell 208. The side of the quantitative shell 208 away from the connecting pipe 207 is fixedly connected to a delivery pipe 209, and the side of the delivery pipe 209 away from the quantitative shell 208 is fixedly connected to the side directly facing the gas chromatograph 1. Both sides of the top of the quantitative plate 210 are fixedly installed with height rods 212 slidably connected to the quantitative shell 208, and the lifting cylinder 211 performs telescopic movement. The lifting cylinder 211 pushes the quantitative plate 210 from the top, and the quantitative plate 210 slides relative to the quantitative shell 208 to quantify the gas.

[0041] The material feeding assembly 7 includes a feeding casing 71 and a feeding needle 76. The bottom end of the feeding casing 71 is fixedly connected to the top end of the feeding needle 76. The inside of the feeding casing 71 is slidably connected with a piston plate 77. A pull rod 75 is fixedly installed on the top end of the piston plate 77. A movable platform 74 is fixedly installed on the top end of the pull rod 75. A feeding base 72 is fixedly installed on the top end of the feeding casing 71. Micro cylinders 73 are fixedly installed on both sides of the top end of the feeding base 72. The movable ends of the two micro cylinders 73 are fixedly connected to both sides of the bottom end of the movable platform 74. The micro cylinders 73 perform telescopic movements. The micro cylinders 73 push the movable platform 74 from the bottom. The movable platform 74 pushes the piston plate 77 to slide relative to the feeding casing 71 through the pull rod 75, and the refinery gas in the feeding casing 71 is transported to the gas chromatograph 1 through the feeding needle 76.

[0042] The bottom end of the feed needle 76 is fixedly connected to the gas chromatograph 1 .

[0043] The method for determining all components of refinery gas of the present invention comprises the following steps:

[0044] Step 1, gas feeding: the combustion gas feeding assembly 2, the combustion-supporting gas feeding assembly 3 and the carrier gas feeding assembly 4 inject the combustion gas, the combustion-supporting gas and the carrier gas in sequence;

[0045] Step 2, refinery gas feeding: the material feeding component 7 adopts split flow to complete the refinery gas feeding;

[0046] Step 3: Component determination: FID+TCD detector 5 and gas chromatograph 1 are used to determine the components in the refinery gas;

[0047] Step 4: Result display: The results of the refinery gas composition determination are intuitively displayed on the computer 6.

[0048] In step 1, the combustion gas, the supporting gas and the carrier gas are specifically: combustion gas H2 30mL / min; supporting gas AIR 300mL / min; carrier gas N2 30mL / min.

[0049] In step 2, the material feeding component 7 has an injection volume of 1.5 μL.

[0050] In the present invention, the combustion gas feed assembly 2, the combustion-supporting gas feed assembly 3 and the carrier gas feed assembly 4 inject the combustion gas, the combustion-supporting gas and the carrier gas in sequence; the combustion-supporting gas and the carrier gas are specifically the combustion gas H2 30mL / min; the combustion-supporting gas AIR 300mL / min; the carrier gas N2 30mL / min, the material feed assembly 7 uses split flow to complete the refinery gas feed; the micro cylinder 73 performs telescopic movement, the micro cylinder 73 pushes the movable platform 74 from the bottom, and the movable platform 74 pushes the piston plate 77 to slide relative to the feed housing 71 through the pull rod 75 , the refinery gas in the feed housing 71 is delivered to the gas chromatograph 1 through the feed needle 76, and the material feed assembly 7 has an injection volume of 1.5 μL; the FID+TCD detector 5 and the gas chromatograph 1 measure the components in the refinery gas; the FID detector 51 measures the content of carbon one to carbon five, one TCD detector 52 measures the content of nitrogen, carbon dioxide, hydrogen sulfide, and carbonyl sulfide, and the other TCD detector 52 measures the content of hydrogen. The results of the refinery gas composition determination are intuitively displayed on the computer 6. The results of the refinery gas are as shown in the attached manual. Figure 8-10 As displayed.

[0051] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A system for measuring all components of refinery gas, comprising a measuring system (8), characterized in that: The measuring system (8) comprises a gas chromatograph (1), a combustion gas feed assembly (2), a combustion-supporting gas feed assembly (3), a carrier gas feed assembly (4), a FID+TCD detector (5), a computer (6) and a material feed assembly (7); the combustion gas feed assembly (2), the combustion-supporting gas feed assembly (3), the carrier gas feed assembly (4), the FID+TCD detector (5) and the material feed assembly (7) are all connected to the gas chromatograph (1); and the computer (6) is connected to the FID+TCD detector (5).

2. The system for measuring all components of refinery gas according to claim 1, characterized in that: The FID+TCD detector (5) comprises a FID detector (51) and two TCD detectors (52).

3. The system for measuring all components of refinery gas according to claim 1, characterized in that: The combustion gas feed assembly (2), the combustion-supporting gas feed assembly (3) and the carrier gas feed assembly (4) all comprise a gas tank (201) and an air intake pipe (202); one side of the gas tank (201) is fixedly connected to one end of the air intake pipe (202); a pump body (206) is provided on the other side of the gas tank (201); a metering shell (208) is provided on one side of the pump body (206); a metering plate (210) is slidably connected to the inside of the metering shell (208); a lifting cylinder (211) is fixedly mounted in the middle of the top of the metering shell (208); a movable end of the lifting cylinder (211) is fixedly connected to the middle of the top of the metering plate (210); a servo motor (203) is fixedly mounted on the top of the gas tank (201); and a stirring paddle (204) located inside the gas tank (201) is fixedly mounted on the output end of the servo motor (203).

4. The system for measuring all components of refinery gas according to claim 3, characterized in that: The air inlet of the pump body (206) is fixedly connected to an extraction pipe (205) extending to the interior of the gas tank (201); the air outlet of the pump body (206) is fixedly connected to a connection pipe (207) extending to the interior of a quantitative shell (208); a side of the quantitative shell (208) away from the connection pipe (207) is fixedly connected to a delivery pipe (209); a side of the delivery pipe (209) away from the quantitative shell (208) is fixedly connected to a side directly facing the gas chromatograph (1); and height rods (212) slidably connected to the quantitative shell (208) are fixedly installed on both sides of the top of the quantitative plate (210).

5. The system for measuring all components of refinery gas according to claim 1, characterized in that: The material feeding assembly (7) includes a feeding casing (71) and a feeding needle (76), the bottom end of the feeding casing (71) is fixedly connected to the top end of the feeding needle (76), the inside of the feeding casing (71) is slidably connected to a piston plate (77), the top end of the piston plate (77) is fixedly installed with a pull rod (75), the top end of the pull rod (75) is fixedly installed with a movable platform (74), the top end of the feeding casing (71) is fixedly installed with a feeding base (72), both sides of the top end of the feeding base (72) are fixedly installed with micro cylinders (73), and the movable ends of the two micro cylinders (73) are fixedly connected to the two sides of the bottom end of the movable platform (74).

6. The system for measuring all components of refinery gas according to claim 5, characterized in that: The bottom end of the feed needle (76) is fixedly connected to the gas chromatograph (1).

7. A method for determining all components of refinery gas, characterized in that: The following steps are involved: Step 1, gas feeding: the combustion gas feeding assembly (2), the combustion gas supporting gas feeding assembly (3) and the carrier gas feeding assembly (4) sequentially inject the combustion gas, the combustion gas supporting gas and the carrier gas; Step 2, refinery gas feeding: the material feeding component (7) adopts split flow to complete the refinery gas feeding; Step 3: Component determination: The FID+TCD detector (5) and the gas chromatograph (1) are used to determine the components in the refinery gas; Step 4: Result display: The results of the refinery gas composition determination are intuitively displayed on the computer (6).

8. The method for determining all components of refinery gas according to claim 7, characterized in that: In the step 1, the combustion gas, the supporting gas and the carrier gas are specifically: combustion gas H2 30 mL / min; supporting gas AIR 300 mL / min; carrier gas N2 30 mL / min.

9. The method for determining all components of refinery gas according to claim 7, characterized in that: The material feeding component (7) in step 2 has an injection volume of 1.5 μL.

Images