A petroleum product moisture receiver calibration device and calibration method

Abstract

This invention belongs to the field of petrochemical instrumentation, and particularly relates to a calibration device and method for a petroleum product moisture receiver. The device includes a support frame with a vertical plate. Several clamps are located on the upper part of the vertical plate to hold a thermostatic sleeve. A sampler, comprising a syringe, an infusion tubing, and a sampling needle, is placed inside a perforation in the thermostatic sleeve. A vertical slide rail is fixed to the vertical plate below the clamps. A slider is located within the slide rail, and a support rod is connected outwards to the slider. A clamping ring is located at the outer end of the support rod to hold the sampling needle. This invention avoids the need to empty and dry the sampler for re-calibration and solves the problem that large-sized petroleum product moisture receivers cannot be placed on a high-precision electronic balance for weighing.

Description

Technical Field

[0001] This invention belongs to the field of petrochemical instrumentation, and particularly relates to a calibration device and calibration method for a moisture receiver for petroleum products. Background Technology

[0002] A moisture receiver is a specialized glass volumetric instrument used to determine the water content in crude oil and petroleum products. It is a key component of the distillation apparatus in distillation methods, and its value is a crucial data source for determining the water content of petroleum products. Therefore, the method standard GB / T 260-2016, "Determination of Water Content in Petroleum Products - Distillation Method," places high demands on its accuracy. While moisture receivers are widely and frequently used, neither JJG196-2006, "Verification Procedure for Commonly Used Glass Volumetric Instruments," nor JJG 10-2005, "Verification Procedure for Special Glass Volumetric Instruments," specifically addresses the verification method for moisture receivers. In recent years, Shandong Province, Heilongjiang Province, Jilin Province, Tianjin Municipality, Inner Mongolia Autonomous Region, and other regions have issued local calibration standards for moisture receivers. During calibration, water is typically poured into the receiver using a long syringe, stopping at the calibration mark, and then the volume is measured. However, several problems arise during actual calibration. First, the shaking of the syringe during water pouring can cause water droplets to stick to the sides, introducing errors. Second, if distilled water is accidentally poured over the calibration mark, the water receiver must be poured out. The process involves several issues: first, the water is removed, then dried, and then refilled. Because the bottom of the petroleum product moisture receiver is long and narrow, it's difficult to dry or remove the distilled water, which is time-consuming and laborious. Second, some petroleum product moisture receivers are very large, and the long needle may not be long enough to calibrate the smaller capacity values ​​on the lower scale. Third, some longer petroleum product moisture receivers have scale lengths of 140-160 mm alone, plus the upper dimensions, totaling over 300 mm in length and over 100 mm in width. The protective window of a high-precision electronic balance limits the weighing capacity of these larger receivers. Therefore, there is an urgent need to develop a calibration device and method for petroleum product moisture receivers to solve these problems. Summary of the Invention

[0003] The problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a calibration device and calibration method for a moisture receiver of petroleum products.

[0004] This invention is achieved through the following technical solution: A calibration device for a moisture receiver of petroleum products includes a support frame. The support frame includes a vertical plate with several clamps on the upper part of the vertical plate. The clamps are used to hold a thermostatic sleeve. The thermostatic sleeve has a vertical perforation in its center, and the outer periphery of the perforation is a heat-insulating cavity. A sample injector is placed inside the perforation of the thermostatic sleeve. The sample injector includes a syringe, an infusion tubing, and an injection needle. The syringe includes an empty cylinder with an outwardly extending ring plate at the upper end of the cylinder. The diameter of the ring plate is larger than the diameter of the perforation. A piston is installed inside the empty cylinder. The nipple at the lower end of the syringe is connected to the infusion tubing, which passes through the perforation. A drip chamber and a flow regulator are installed on the infusion tubing, and the lower end of the infusion tubing is connected to the injection needle. A vertical slide rail is fixed on the vertical plate below the clamps. Slot holes are symmetrically arranged on both sides of the slide rail. A slider is installed inside the slide rail. Screws are symmetrically arranged at both ends of the slider, passing through the slot holes. Nuts are installed on the screws. A horizontal support rod is integrally connected to the slider outward. A clamping ring is provided at the outer end of the support rod to hold the injection needle.

[0005] Furthermore, it also includes a test tube clamp, which is fixed on a vertical plate and located below the slide rail. The central axis of the clamping ring of the test tube clamp is on the same vertical line as the central axis of the holding ring.

[0006] Preferably, the clamping ring is a cylinder with a clamping hole at the center. The diameter of the clamping hole is equal to the diameter of the injection needle, and a rubber layer is provided around the inner wall of the clamping hole.

[0007] Preferably, the fixing clip is an elastic clip or a test tube clip.

[0008] Preferably, the thermostatic jacket is a glass water bath jacket, and the thermostatic jacket is provided with an inlet pipe and an outlet pipe.

[0009] Preferably, the constant temperature jacket is an electrically controlled heating jacket.

[0010] Preferably, the bracket is fixed with triangular support legs on both sides.

[0011] Preferably, the injection needle is a metal needle.

[0012] This invention also includes a method for calibrating a moisture receiver for petroleum products, comprising the following steps: Step 1: Prepare distilled water at t℃ and place the sampler and the dried petroleum product moisture receiver at t℃ for at least 4 hours.

[0013] Step 2: Draw distilled water at a constant temperature of t℃ into the syringe, place the syringe on a balance and weigh it to obtain the mass m0.

[0014] Step 3: Place the syringe on the thermostatic mantle, with the temperature inside the mantle at t℃. Use the fixing clamp to hold the thermostatic mantle in place, and use the clamping ring to hold the injection needle. After clamping the petroleum product moisture receiver, place it directly below the injection needle, so that the injection needle is located at the center of the inlet of the petroleum product moisture receiver.

[0015] Step 4: Slide the slider to insert the injection needle into the petroleum product moisture receiver, tighten the nut to fix the slider, gently push the piston to inject distilled water into the petroleum product moisture receiver until the distilled water level reaches the first calibration point mark, and then close the flow regulator; during the distilled water injection process, if the distilled water level exceeds the first calibration point mark, pull the piston upward to draw back the excess distilled water until the distilled water level reaches the first calibration point mark, and then close the flow regulator.

[0016] Step 5: Loosen the nut, slide the slider upward to disengage the injection needle from the petroleum product moisture receiver, remove the injection needle from the clamping ring, remove the thermostatic sleeve, remove the injector from the thermostatic sleeve, and then place the injector on a balance for weighing to obtain the mass m1.

[0017] Step 6: Subtract m1 from m0 to obtain the mass m of distilled water injected at the current calibration point. i To find the value of k(t) at t℃ for the moisture receiver of petroleum products, where k(t) is the temperature compensation coefficient, the capacity error ΔV is obtained. The capacity error is calculated as ΔV = Vc - m. i ×k(t), where Vc is the nominal capacity of the calibration point scale.

[0018] Step 7: Repeat steps 3-6 to calibrate the next calibration point.

[0019] As a preferred option: In step two, the petroleum product moisture receiver is held by a test tube clamp on a vertical plate or a test tube clamp on an iron stand.

[0020] The beneficial effects of this invention are as follows: 1. The injection needle of the device of the present invention can be inserted into the bottom of the water receiver of petroleum products of different sizes, avoiding the problem of inaccurate capacity calibration data caused by air bubbles and cavities generated at the bottom of the water receiver due to water tension.

[0021] 2. The device of this invention avoids the problem of accidentally exceeding the calibration mark during calibration, requiring the water to be poured out, dried, and started over. Excess distilled water can be aspirated using a syringe, allowing for precise control of the calibration point. Slowly injecting or withdrawing distilled water through the injection needle prevents water droplets from being left on the petroleum product moisture receiver tubing, eliminating the need for re-drying and ensuring controllable calibration, thus improving efficiency.

[0022] 3. The device of this invention can realize the continuous volume calibration of the petroleum product moisture receiver, eliminating the need for the water in the petroleum product moisture receiver to be emptied, dried, and refilled after each calibration mark, as is the case with traditional calibration methods, thus greatly improving calibration efficiency.

[0023] 4. The calibration method of the present invention does not require weighing the petroleum product moisture receiver. By weighing the sampler of the present invention, the problem of large-sized petroleum product moisture receivers being unable to be weighed on a high-precision electronic balance, as well as the problem of exceeding the weighing range of the balance, is solved. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of this embodiment; Figure 2 This is a schematic diagram of the structure after installation in this embodiment; Figure 3 This is a schematic diagram of the structure in which the sample injector is placed inside the thermostatic jacket in this embodiment; Figure 4 for Figure 3 Another structural diagram; Figure 5 This is a schematic diagram of the injector structure in this embodiment; Figure 6 This is a schematic diagram of the thermostatic jacket structure in this embodiment; Figure 7 This is a schematic diagram of the support structure in this embodiment; Figure 8 This is a schematic diagram of the slide rail and test tube clamp structure in this embodiment.

[0025] In the diagram, 1 is the support, 2 is the vertical plate, 3 is the fixing clamp, 4 is the thermostatic sleeve, 5 is the perforation, 6 is the syringe, 7 is the empty cylinder, 8 is the ring plate, 9 is the piston, 10 is the infusion tubing, 11 is the flow regulator, 12 is the injection needle, 13 is the slide rail, 14 is the strip hole, 15 is the slider, 16 is the screw, 17 is the nut, 18 is the support rod, 19 is the clamping ring, 20 is the test tube clamp, 21 is the clamping hole, 22 is the water inlet pipe, 23 is the water outlet pipe, 24 is the triangular support leg, 25 is the dripping bucket, and 26 is the petroleum product moisture receiver. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0027] This embodiment includes a support 1, which comprises a vertical plate 2. The vertical plate 2 is in a vertical position, and triangular support legs 24, which are triangular in shape, are fixed on both the left and right sides of the vertical plate 2. Several fixing clips 3 are fixed on the upper part of the vertical plate 2, and each fixing clip 3 is provided with a slide rail 13 below it. The arrangement of multiple fixing clips 3 allows multiple calibration experiments to be performed simultaneously on the vertical plate 2. The fixing clip 3 is used to hold the thermostatic sleeve 4, which is used to maintain the temperature of the distilled water entering the petroleum product moisture receiver 26. Any existing fixing clip 3 that can hold the thermostatic sleeve 4 can be used; this invention does not impose any special limitations. For example, it can be a common elastic clip used for hanging mop handles, whose core structure is an elastic buckle design. Two inwardly inclined elastic clamping arms cooperate with the middle clamping block to form a triangular clamping space, contacting the mop handle on three sides to ensure a stable clamping. In this embodiment, a common elastic clip for hanging mop handles can be used to hold and fix the thermostatic sleeve 4; alternatively, a test tube clamp 20 commonly used in laboratories can be used to hold the thermostatic sleeve 4. There are various fixing clips 3 that can hold the thermostatic sleeve 4 in everyday life, which will not be described in detail here, and this invention does not impose any special limitations. The thermostatic sleeve 4 in this embodiment is cylindrical in shape, and the principle of being clamped by the elastic clip is the same as that of the mop handle, which will not be described in detail here. A vertical perforation 5 is provided in the center of the thermostatic jacket 4, extending downwards through the thermostatic jacket 4. The outer periphery of the perforation 5 is an insulation cavity used to keep the material placed inside the perforation 5 warm. The thermostatic jacket 4 can be an electrically controlled heating jacket or a water bath heating jacket. In this embodiment, to facilitate observation of the amount of water inside the syringe 6, a glass water bath jacket is used. The glass water bath jacket is provided with an inlet pipe 22 and an outlet pipe 23. Water at a certain temperature is introduced into the insulation cavity through the inlet pipe 22, and the water in the insulation cavity flows out from the outlet pipe 23 below, thereby keeping the material warm. The glass water bath jacket is a known existing device, and its structure and principle will not be described in detail here.

[0028] A syringe is placed inside the perforation 5 of the thermostatic sleeve 4. The syringe includes a syringe 6, an infusion tubing 10, and an injection needle 12 connected together. The syringe 6 can be a commonly used syringe in hospitals. The syringe 6 includes an empty cylinder 7, inside which is a piston 9. An annular plate 8 is provided at the upper end of the empty cylinder 7. The diameter of the annular plate 8 is larger than the diameter of the perforation 5. This ensures that the empty cylinder 7 of the syringe 6 can rest on the perforation 5 of the thermostatic sleeve 4, and the syringe 6 will not fall out of the perforation 5. The lower end of the syringe 6 is connected to the infusion tubing 10, which passes through the perforation 5. The infusion tubing 10 is equipped with a drip chamber 25 and a flow regulator 11. The lower end of the infusion tubing 10 is connected to the injection needle 12, which is connected to the infusion tubing 10 for injecting distilled water into the petroleum product moisture receiver 26. The above structure is similar to that of a hospital infusion device. The drip chamber 25 is a section with a larger diameter on the infusion tubing 10, used to observe the speed of water dripping. The flow regulator 11 is used to adjust the water flow rate. In this embodiment, the most common roller-type flow regulator on infusion devices can be used. Rotating the roller can gradually squeeze the infusion tubing 10, thereby accurately adjusting the flow rate.

[0029] The syringe 6, infusion tubing 10, and flow regulator 11 are all made of plastic, while the injection needle 12 is a stainless steel metal needle.

[0030] A vertical slide rail 13 is fixed on the vertical plate 2 below the fixed clamp 3. Slot holes 14 are symmetrically provided on both sides of the slide rail 13. A slider 15 is provided inside the slide rail 13, and the slider 15 can slide up and down along the slide rail 13. Screws 16 are symmetrically fixed at both ends of the slider 15, and the screws 16 on both sides pass through the slot holes 14 respectively. Nuts 17 are provided on the screws 16. Tightening the nuts 17 will prevent the slider 15 from sliding up and down along the slide rail 13. A horizontal support rod 18 is integrally connected to the vertical slider 15. The support rod 18 is perpendicular to the vertical plate 2, and a clamping ring 19 is provided at the outer end of the support rod 18. The clamping ring 19 is used to clamp the injection needle 12. In this embodiment, the clamping ring 19 is a cylinder with a clamping hole 21 at its center. The clamping hole 21 extends through the clamping ring 19 and its diameter is equal to the diameter of the injection needle 12. A rubber layer is provided around the inner wall of the clamping hole 21. Pushing the injection needle 12 allows it to pass downward through the clamping hole 21. When the injection needle 12 is not pushed, the friction of the rubber layer keeps the injection needle 12 within the clamping hole 21, thus clamping the injection needle 12. Other structural forms can be used to clamp the injection needle 12 in this invention, and this invention does not impose any special limitations.

[0031] In experiments, test tube clamps 20 fixed on an iron stand are generally used to hold the petroleum product moisture receiver 26. In this embodiment, a clamping device for the petroleum product moisture receiver 26 can be set on a vertical plate 2 to replace the iron stand. Specifically, the end of the test tube clamp 20 away from the clamping ring is fixed on the vertical plate 2. The test tube clamp 20 is located below the slide rail 13. When fixing, ensure that the central axis of the clamping ring at the outer end of the test tube clamp 20 is on the same vertical line as the central axis of the clamping ring 19. This ensures that the injection needle 12 is located at the center of the liquid inlet of the petroleum product moisture receiver 26 and does not touch the inner wall of the petroleum product moisture receiver 26.

[0032] Using the above-described petroleum product moisture receiver calibration device of the present invention, the petroleum product moisture receiver calibration method of the present invention includes the following steps: Step 1: Prepare distilled water at a constant temperature of 20°C, and place the sampler of the present invention (which includes a syringe 6, an infusion tubing 10, and an injection needle 12 connected together, and the drip chamber 25 and flow regulator 11 on the infusion tubing 10 are also included as part of the infusion tubing 10) and the dried petroleum product moisture receiver 26 to be calibrated in a constant temperature room at 20°C for 5 hours.

[0033] Step 2: Draw a certain amount of 20℃ constant temperature distilled water into syringe 6. Then place the syringe on a balance with a mass of 0.01% and weigh it to obtain the mass m0.

[0034] Step 3: Place syringe 6 on the thermostatic sleeve 4, insert syringe 6 into the perforation 5 of the thermostatic sleeve 4, and place the empty barrel 7 of syringe 6 on the outer edge of the upper end of the perforation 5. Connect the water inlet pipe 22 and water outlet pipe 23 of the thermostatic sleeve 4 to the pipeline, so that the temperature inside the thermostatic sleeve 4 is 20℃. Use the fixing clamp 3 to clamp the thermostatic sleeve 4, and the infusion tubing 10 extends downward from the perforation 5 of the thermostatic sleeve 4. The experimenter inserts the injection needle 12 into the clamping hole 21 of the clamping ring 19, and releases the clamping ring 19 after clamping the upper part of the injection needle 12. After clamping the petroleum product moisture receiver 26, place it directly below the injection needle 12, so that the injection needle 12 is located in the center of the inlet of the petroleum product moisture receiver 26, so that the injection needle 12 does not touch the inner wall of the petroleum product moisture receiver 26 when moving up and down. In this experiment, instead of using an iron stand to fix the petroleum product moisture receiver 26, the upper part of the injection needle 12 is directly clamped by the test tube clamp 20 on the vertical plate 2.

[0035] Step 4: Slide slider 15 to insert injection needle 12 into petroleum product moisture receiver 26. The lower end of injection needle 12 should be higher than the first calibration point mark. Then tighten the nuts 17 on both sides to fix slider 15, thus fixing the position of injection needle 12. At this time, gently push piston 9 to inject distilled water into petroleum product moisture receiver 26 through infusion tubing 10 and injection needle 12 until the distilled water level reaches the first calibration point mark. In this embodiment, the first calibration point mark is 0.5 mL. After reaching the first calibration point mark, close flow regulator 11. If the distilled water level accidentally exceeds the first calibration point mark (0.5 mL) during the distilled water injection process, gently pull piston 9 upward to draw back the excess distilled water until the distilled water level reaches the first calibration point mark, and then close flow regulator 11.

[0036] Step 5: Loosen nut 17, slide slider 15 upward to disengage injection needle 12 from petroleum product moisture receiver 26, that is, make the lower end of injection needle 12 higher than the inlet of petroleum product moisture receiver 26. Then pull injection needle 12 out from clamp hole 21 of clamping ring 19, remove thermostatic sleeve 4 from fixed clamp 3, take out injection device from thermostatic sleeve 4, and then place injection device on balance with a mass of 0.01% again for weighing to obtain mass m1.

[0037] Step 6: Subtract m1 from m0 to obtain the mass m of distilled water injected at the first calibration point. i Query the k(t) value of the petroleum product moisture receiver 26 at the current water temperature. k(t) is the temperature compensation coefficient. Calculate the capacity error ΔV. The capacity error calculation formula is: ΔV = Vc - m i ×k(t), where Vc is the nominal capacity of the calibration point. In this embodiment, the petroleum product moisture receiver 26 is made of high borosilicate glass. Therefore, the k(t) value table of high borosilicate glass is consulted, and the k(t) value at a water temperature of 20℃ is found to be 1.00285 mL / g. The capacity error of the first calibration point (0.5mL) is calculated to be -0.039mL.

[0038] Step 7: Repeat steps 3-6 above to calibrate the next calibration point. This embodiment has three calibration points. The second calibration point has a scale of 1.0 mL, and the third calibration point has a scale of 5.0 mL. The final calibration results of this embodiment are shown in the table below: As can be seen from the calibration results of this embodiment, this petroleum product moisture receiver 26 meets the accuracy requirements of GB / T 260-2016 "Determination of Water Content in Petroleum Products - Distillation Method" and can be used.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; those skilled in the art should understand that modifications can still be made to the technical solutions described in the above embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A calibration device for a moisture receiver of petroleum products, characterized in that: The support (1) includes a vertical plate (2), and several fixing clips (3) are provided on the upper part of the vertical plate (2). The fixing clips (3) are used to clamp the thermostatic sleeve (4). The thermostatic sleeve (4) has a vertical perforation (5) in the center. The outer periphery of the perforation (5) is a heat-insulating cavity. The injector is placed in the perforation (5) of the thermostatic sleeve (4). The injector includes a syringe (6), an infusion tubing (10) and an injection needle (12). The syringe (6) includes an empty cylinder (7). An annular plate (8) is provided on the upper end of the empty cylinder (7). The diameter of the annular plate (8) is larger than the diameter of the perforation (5). A piston (9) is provided in the empty cylinder (7). The nipple at the lower end of the syringe (6) is connected to the infusion tubing (10). The infusion tubing (10) is inserted through the perforation (5). The infusion tubing (10) is connected to a needle (12). A vertical slide rail (13) is fixed on the vertical plate (2) below the clamp (3). A strip hole (14) is symmetrically provided on both sides of the slide rail (13). A slider (15) is provided inside the slide rail (13). A screw (16) is symmetrically provided at both ends of the slider (15). The screw (16) passes through the strip hole (14). A nut (17) is provided on the screw (16). A horizontal support rod (18) is integrally connected to the slider (15) outward. A clamping ring (19) is provided at the outer end of the support rod (18). The clamping ring (19) is used to clamp the needle (12).

2. The petroleum product moisture receiver calibration device according to claim 1, characterized in that: It also includes a test tube clamp (20), which is fixed on the vertical plate (2). The test tube clamp (20) is located below the slide rail (13), and the central axis of the clamping ring of the test tube clamp (20) is on the same vertical line as the central axis of the clamping ring (19).

3. The petroleum product moisture receiver calibration device according to claim 1 or 2, characterized in that: The clamping ring (19) is a cylinder with a clamping hole (21) at the center. The diameter of the clamping hole (21) is equal to the diameter of the injection needle (12). A rubber layer is provided around the inner wall of the clamping hole (21).

4. The petroleum product moisture receiver calibration device according to claim 1 or 2, characterized in that: The fixing clip (3) is an elastic clip or a test tube clip (20).

5. The petroleum product moisture receiver calibration device according to claim 1 or 2, characterized in that: The thermostatic jacket (4) is a glass water bath jacket, and the thermostatic jacket (4) is provided with an inlet pipe (22) and an outlet pipe (23).

6. The petroleum product moisture receiver calibration device according to claim 1 or 2, characterized in that: The constant temperature jacket (4) is an electrically controlled heating jacket.

7. The petroleum product moisture receiver calibration device according to claim 1 or 2, characterized in that: The bracket (1) is fixed with triangular support legs (24) on both sides.

8. The petroleum product moisture receiver calibration device according to claim 1 or 2, characterized in that: The injection needle (12) is a metal needle.

9. A method for calibrating a petroleum product moisture receiver based on the petroleum product moisture receiver calibration device according to claim 1 or 2, characterized in that: Includes the following steps: Step 1: Prepare distilled water at t℃ and place the sampler and the dried petroleum product moisture receiver (26) at t℃ in a constant temperature room for more than 4 hours. Step 2: Draw t℃ constant temperature distilled water into the syringe (6), place the syringe on the balance and weigh it to obtain the mass m0; Step 3: Place the syringe (6) on the thermostatic sleeve (4), the temperature inside the thermostatic sleeve (4) is t℃, use the fixing clip (3) to clamp the thermostatic sleeve (4), and use the clamping ring (19) to clamp the injection needle (12); after clamping the petroleum product moisture receiver (26), place it directly below the injection needle (12), so that the injection needle (12) is located at the center of the inlet of the petroleum product moisture receiver (26); Step 4: Slide the slider (15) to insert the injection needle (12) into the petroleum product moisture receiver (26), tighten the nut (17) to fix the slider (15), gently push the piston (9) to inject distilled water into the petroleum product moisture receiver (26) until the distilled water level reaches the first calibration point scale line, and close the flow regulator (11); during the distilled water injection process, if the distilled water level exceeds the first calibration point scale line, pull the piston (9) upward to draw back the excess distilled water until the distilled water level reaches the first calibration point scale line, and then close the flow regulator (11); Step 5: Loosen the nut (17), slide the slider (15) upward to disengage the injection needle (12) from the petroleum product moisture receiver (26), remove the injection needle (12) from the clamping ring (19), remove the thermostatic sleeve (4), remove the injector from the thermostatic sleeve (4), and place the injector on the balance for weighing to obtain the mass m1; Step 6: Subtract m1 from m0 to obtain the mass of distilled water at the current calibration point. i Query the k(t) value of the petroleum product moisture receiver (26) at the current water temperature. k(t) is the temperature compensation coefficient. Obtain the capacity error ΔV. The capacity error calculation formula is ΔV=Vc-m i ×k(t), where Vc is the nominal capacity of the calibration point scale; Step 7: Repeat steps 3-6 to calibrate the next calibration point.

10. The method for calibrating a moisture receiver for petroleum products according to claim 9, characterized in that: In step two, the petroleum product moisture receiver (26) is held by a test tube clamp (20) on a vertical plate (2) or by a test tube clamp (20) on an iron stand.

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