Method for metering yellow phosphorus in tank car

Abstract

The invention discloses a method for measuring yellow phosphorus in a tank car, the tank car is provided with a tank, the tank is provided with a tank cavity, the tank cavity is filled with yellow phosphorus, and the yellow phosphorus is sealed with water, and the method comprises the following steps: S01, filling the tank cavity with water, heating the tank cavity until the yellow phosphorus is molten, then stopping heating, and detecting the water temperature T hot water of the water in the tank cavity and the temperature T yellow of the yellow phosphorus at the moment; weighing the tank car to obtain the weight G heat; s02, discharging all hot water and yellow phosphorus in the heated tank cavity, and weighing to obtain the weight G < empty > of the tank car with the empty tank cavity; s03, the empty tank cavity is filled with water and weighed, the weight G water of the tank car filled with the water tank cavity is obtained, and the water temperature T water of the water in the filled water tank cavity is detected; s04, the density rho yellow of yellow phosphorus at the corresponding temperature is searched according to T yellow, the density rho hot water of hot water at the corresponding temperature is searched according to T hot water, and the density rho water of water at the corresponding temperature is searched according to T water; by means of the method, the weight of yellow phosphorus in the tank car can be well metered, and metering is accurate.

Description

Technical Field

[0001] The invention relates to a method for measuring yellow phosphorus in a tank truck. Background Art

[0002] At present, yellow phosphorus is generally transported by tank trucks. Since yellow phosphorus will spontaneously combust and produce a lot of smoke when it comes into contact with air, the usual method is to use water to isolate the air, that is, to set a layer of water above the yellow phosphorus. Secondly, the melting point of yellow phosphorus is 44.1℃, which is relatively low. Before unloading, yellow phosphorus is generally in a solid state, so it needs to be heated before unloading, and can only be unloaded when it is in a liquid state.

[0003] A Chinese patent with announcement number CN201535692U discloses a precise metering and safe unloading device for a yellow phosphorus tank truck. The device provides a dedicated metering device and pre-adds hot water to the metering device. The yellow phosphorus is pressed into the metering device so that the water in the metering device overflows into the hot water tank. The volume of the overflowing water in the hot water tank is weighed to obtain the weight of the yellow phosphorus. However, this method requires a dedicated metering device, which is not very convenient, and the influence of temperature will also have a certain impact on the metering. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a method for measuring yellow phosphorus in a tank truck, which can well measure the weight of the yellow phosphorus in the tank truck and measure accurately.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: a method for measuring yellow phosphorus in a tank truck, the tank truck is provided with a tank, the tank has a tank cavity, the tank cavity is filled with yellow phosphorus, and water is sealed on the yellow phosphorus, the steps of the method include:

[0006] S01: Fill the tank cavity with water, heat the tank cavity until the yellow phosphorus melts, then stop heating, and detect the water temperature T in the tank cavity at this time 热水 and the temperature T of yellow phosphorus 黄 , and weigh the tanker to obtain a weight of G 热 ;

[0007] S02: Unload all the hot water and yellow phosphorus in the heated tank cavity and weigh them to obtain the weight of the tank truck with an empty tank cavity: G 空 ;

[0008] S03: Fill the empty tank cavity with water and weigh it. The weight of the tank truck with the full tank cavity is G 水 , and detect the water temperature of the water in the full water tank cavity is T 水 ;

[0009] S04: According to T 黄 Find the density ρ of yellow phosphorus at the corresponding temperature 黄 , according to T热水 Find the density ρ of hot water at the corresponding temperature 热水， According to T 水 Find the density ρ of water at the corresponding temperature 水 ; Calculate the actual weight of yellow phosphorus in the tank cavity G according to the first formula or the second formula 黄 ;in,

[0010] The first formula is G 黄 =ρ 黄 / (ρ 黄 -ρ 热水 ){G 热 +G 空 (ρ 热水 / ρ 水 -1)-ρ 热水 / ρ 水 ×G 水};

[0011] The second formula is G 黄 (1-ρ 热水 / ρ 黄 )=(G 热 -G 空 -V 总 ×ρ 热水 ) / (1-ρ 热水 / ρ 黄 ), V 总 is the volume of the tank cavity.

[0012] Further, in step S01, the temperature T of yellow phosphorus 黄 70℃~80℃, T 热水 It is 70°C to 80°C, preferably 72°C to 76°C.

[0013] Further, the water level of the empty tank cavity filled with water in step S03 is at the same level as the water level of the yellow phosphorus and water after heating in step S01.

[0014] After adopting the above technical solution, the weight of yellow phosphorus can be accurately measured through the measuring method of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The state of the method for measuring yellow phosphorus in a tank truck of the present invention Figure 1 ;

[0016] Figure 2 The state of the method for measuring yellow phosphorus in a tank truck of the present invention Figure 2 ;

[0017] Figure 3 The state of the method for measuring yellow phosphorus in a tank truck of the present invention Figure 3 ;

[0018] Figure 4 The state of the method for measuring yellow phosphorus in a tank truck of the present invention Figure 4 ;in,

[0019] A is the added water, B is the original cold water, C is solid yellow phosphorus, D is the heated hot water, E is liquid yellow phosphorus, and F is the full water added. DETAILED DESCRIPTION

[0020] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0021] like Figures 1 to 4 As shown, a method for measuring yellow phosphorus in a tank truck, the tank truck is provided with a tank, the tank has a tank cavity, the tank cavity is filled with yellow phosphorus, and water is sealed on the yellow phosphorus, the method steps include:

[0022] S01: Fill the tank cavity of the yellow phosphorus tank truck that has just arrived at the unloading point with water. Figure 1 As shown, the temperature of the tank cavity is raised until the yellow phosphorus melts and then the temperature is stopped (the temperature is about 75°C). The water temperature T of the water in the tank cavity is detected at this time. 热水 and the temperature T of yellow phosphorus 黄 , and weigh the tank truck (including the tank and the front), and get the weight G 热 , such as Figure 2 As shown;

[0023] S02: Unload all the hot water and yellow phosphorus in the heated tank cavity and weigh them to obtain the weight of the tank truck with an empty tank cavity: G 空 , such as Figure 3 As shown;

[0024] S03: Fill the empty tank cavity with water and weigh it. The weight of the tank truck with the full tank cavity is G 水 , and detect the water temperature of the water in the full water tank cavity is T 水 , such as Figure 4 As shown;

[0025] S04: According to T 黄 Find the density ρ of yellow phosphorus at the corresponding temperature 黄 , according to T 热水 Find the density ρ of hot water at the corresponding temperature 热水， According to T 水 Find the density ρ of water at the corresponding temperature 水 ; Calculate the actual weight of yellow phosphorus in the tank cavity G according to formula (1) or formula (2): 黄 ;in,

[0026] The first formula is G 黄 =ρ 黄 / (ρ黄 -ρ 热水 ){G 热 +G 空 (ρ 热水 / ρ 水 -1)-ρ 热水 / ρ 水 ×G 水};

[0027] The second formula is G 黄 (1-ρ 热水 / ρ 黄 )=(G 热 -G 空 -V 总 ×ρ 热水 ) / (1-ρ 热水 / ρ 黄 ), V 总 is the volume of the tank cavity.

[0028] The specific derivation process of the first formula and the second formula is as follows:

[0029] According to the above test data, we can know that:

[0030] 1) The weight of the tank truck with empty tank cavity is: G 空 ;

[0031] 2) The weight of a tank truck with a full tank is: G 水 , temperature T 水 ;

[0032] 3) After heating, the weight is G 热 , water temperature is T 热水 , the temperature of the yellow phosphorus liquid is T 黄 ;

[0033] Then, assuming the volume of the tank cavity is V 总 , the weight of yellow phosphorus is G 黄 , the volume of yellow phosphorus after heating is V 黄 , the density of yellow phosphorus after heating is ρ 黄 , the volume of hot water after heating is V 热水 , the density of hot water is ρ 热水 The volume of water after adding water to the empty tank cavity is V 总 , the specific gravity of water is ρ 水 Based on the above known conditions, the following calculation formula can be listed: G 热 =G 黄 +V 热水 ×ρ 热水 +G 空 (1);

[0034] G 黄 =V 黄×ρ 黄 (2);

[0035] V 总 =V 黄 +V 热水 (3);

[0036] G 水 =V 总 ×ρ 水 —G 空 (4);

[0037] Substitute equation (3) into equation (1), then:

[0038] G 热 =G 黄 +(V 总 -V 黄 )×ρ 热水 +G 空 ;

[0039] G 热 -G 空 =G 黄 +V 总 ×ρ 热水 -V 黄 ×ρ 热水 ;

[0040] G 黄 =G 热 -G 空 -V 总 ×ρ 热水 +V 黄 ×ρ 热水 ;

[0041] G 黄 =G 热 -G 空 -V 总 ×ρ 热水 +(G 黄 / ρ 黄 )×ρ 热水 ;

[0042] G 黄 -(G 黄 / ρ 黄 )×ρ 热水 =G 热 -G 空 -V 总 ×ρ 热水 ;

[0043] G 黄 (1 - ρ 热水 / ρ 黄 ) = G 热 -G空 -V 总 ×ρ 热水 ;

[0044] G 黄 (1-ρ 热水 / ρ 黄 )=G 热 -G 空 -V 总 ×ρ 热水 (5);

[0045] Substituting formula (4) into formula (5), we get:

[0046] G 黄 (1-ρ 热水 / ρ 黄 )=G 热 -G 空 -(G 水 -G 空 ) / ρ 水 ×ρ 热水 ;

[0047] G 黄 =ρ 黄 / (ρ 黄 -ρ 热水 ){G 热 -G 空 -(G 水 -G 空 ) / ρ 水 ×ρ 热水};

[0048] G 黄 =ρ 黄 / (ρ 黄 -ρ 热水 ){G 热 +G 空 (ρ 热水 / ρ 水 -1)-ρ 热水 / ρ 水 ×G 水};

[0049] Therefore, the weight of yellow phosphorus is calculated according to the following formula:

[0050] G 黄 =ρ 黄 / (ρ 黄 -ρ 热水 ){G 热 +G 空 (ρ 热水 / ρ 水 -1)-ρ 热水 / ρ 水 ×G水}, which is the first formula; when the volume of the tank cavity is known in advance, the above formula can be simplified to:

[0051] G 黄 (1-ρ 热水 / ρ 黄 )=(G 热 -G 空 -V 总 ×ρ 热水 ) / (1-ρ 热水 / ρ 黄 ), which is the second formula;

[0052] Where: G 黄 , unit: kg;

[0053] G 热 , unit: kg;

[0054] G 空 , unit: kg;

[0055] G 水 , unit: kg;

[0056] ρ 黄 , unit: kg / m 3 , see Table 1 for the comparison table, which is the prior art;

[0057] ρ 热水 -----Unit: kg / m 3 , see Table 1 for comparison;

[0058] ρ 水 -----Unit: kg / m 3 , see Table 1 for the comparison table, which is the prior art.

[0059] Table 1 Comparison table of water temperature and water density and yellow phosphorus temperature and yellow phosphorus density

[0060]

[0061]

[0062]

[0063] Specifically, the water level of the empty tank cavity filled with water in step S03 is at the same level as the water level of the yellow phosphorus and water after heating in step S01. All the above weighing is carried out at the unloading point.

[0064] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. 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 method for measuring yellow phosphorus in a tank truck, wherein the tank truck is provided with a tank having a tank cavity, the tank cavity is filled with yellow phosphorus, and water is sealed on the yellow phosphorus, characterized in that: The steps of the method include: S01: Fill the tank cavity with water, heat the tank cavity until the yellow phosphorus melts, then stop heating, and detect the water temperature T in the tank cavity at this time 热水 and the temperature T of yellow phosphorus 黄 , and weigh the tanker to obtain a weight of G 热 ; S02: Unload all the hot water and yellow phosphorus in the heated tank cavity and weigh them to obtain the weight of the tank truck with an empty tank cavity: G 空 ; S03: Fill the empty tank cavity with water and weigh it. The weight of the tank truck with the full tank cavity is G 水 , and detect the water temperature of the water in the full water tank cavity is T 水 ; S04: According to T 黄 Find the density ρ of yellow phosphorus at the corresponding temperature 黄 , according to T 热水 Find the density ρ of hot water at the corresponding temperature 热水， According to T 水 Find the density ρ of water at the corresponding temperature 水 ; Calculate the actual weight of yellow phosphorus in the tank cavity G according to the first formula or the second formula 黄 ; in, The first formula is G 黄 = ρ 黄 / (ρ 黄 - ρ 热水 ){G 热 + G 空 (ρ 热水 / ρ 水 - 1)- ρ 热水 / ρ 水 × G 水}; The second formula is G 黄 (1-ρ 热水 / ρ 黄 )=(G 热 -G 空 -V 总 ×ρ 热水 ) / (1-ρ 热水 / ρ 黄 ), V 总 is the volume of the tank cavity.

2. The measuring method according to claim 1, characterized in that: In step S01, the temperature T of yellow phosphorus 黄 70℃~80℃, T 热水 It is 70℃~80℃.

3. The measuring method according to claim 1, characterized in that: The water level of the empty tank cavity filled with water in step S03 is at the same level as the water level of the yellow phosphorus and water after heating in step S01.

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