Sample heat calculation experiment system
Through the sample calorific calculation experimental system, the ambient temperature and water quality are measured, the measurement conditions of the calorimeter are optimized, the impact of ambient temperature and water quality on the accuracy of calorimeter measurement is solved, and the measurement accuracy of coal calorimeter is improved. Ensures the scientific nature of combustion performance and safety assessment.
Patent Information
- Application Number
- CN202411353152.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-26
- Publication Date
- 2024-12-17
AI Technical Summary
When using a calorimeter to measure the heat of a substance, factors such as ambient temperature and water quality have an impact on the measurement accuracy, resulting in the accuracy of the measurement results that may be low, especially in the measurement of coal calorimeters, which affects the combustion performance and Accuracy of safety assessment.
A sample calorific calculation experimental system was designed, including a calorimeter, a first temperature sensor and an automatic weighing assembly. By measuring ambient temperature and water quality, their impact on the calorific measurements, and the ambient temperature was verified by experimental methods. and the effect of water quality on measurement accuracy.
Through experiments, the impact of ambient temperature and water quality on calorific measurements is determined, the measurement conditions are optimized, the measurement accuracy of coal calorific value is improved, the scientific nature of combustion performance and safety assessment is ensured, and the probability of safety accidents is reduced.
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Figure CN119147124A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of calorific value calculation, and more specifically, to a sample calorific value calculation experimental system. Background Art
[0002] Calorimeter, commonly known as calorimeter or calorie meter, is an instrument that measures the calorific value of solid or liquid based on the principle of heat absorption. First, the calorific value can be measured by the calorific value. For solid fuels: it is mainly used to measure the calorific value of solid combustibles such as coal, straw, coke, gangue, etc. to measure the quality of the measured object. These measurement results have important application value in industries such as electricity, coal, metallurgy, petrochemicals, quality inspection, and environmental protection. For liquid fuels: some calorimeters can also measure the calorific value of liquids such as petroleum, providing key data for energy utilization and conversion. Second, the application field of calorimeter is wide. Calorimeter is widely used in many fields such as thermal power, cement, coal, new energy, petrochemicals, pharmaceuticals, etc., and is one of the main instruments in coal quality laboratories. It can help users understand the calorific value of fuel, thereby optimizing energy utilization plans and improving energy utilization efficiency.
[0003] When using a calorimeter to measure the calorific value of a substance, it is usually required that the measurement accuracy is high. However, when actually using a calorimeter to measure the calorific value of a substance, there may be multiple factors that affect the measurement accuracy. Based on this, it is particularly important to determine which factors affect the measurement accuracy. Summary of the invention
[0004] The present invention provides a sample heat calculation experimental system, which aims to determine which factors have an impact on the accuracy of measurement.
[0005] A sample heat calculation experimental system, comprising: a calorimeter and a first temperature sensor; the calorimeter including an automatic weighing assembly and a second temperature sensor; The calorimeter is used to measure the calorific value of the sample; The first temperature sensor is used to measure the ambient temperature of the calorimeter; The automatic weighing assembly is used to measure the mass of water in the calorimeter; The second temperature sensor is used to measure the temperature of the water in the calorimeter.
[0006] In one embodiment, a sample heat calculation experimental method performed by the system includes: At a first ambient temperature, a first calorific value of benzoic acid with a mass of M1 is measured, and the first ambient temperature satisfies: ,in, is the first ambient temperature, is the first coefficient, is the second coefficient, Less than 1, represents the initial temperature of water in the calorimeter; At a second ambient temperature, a second calorific value of benzoic acid with a mass of M1 is measured, and the second ambient temperature satisfies: ,in, is the second ambient temperature, is the third coefficient, is the fourth coefficient, Greater than 1; In response to , it is determined that the ambient temperature of the calorimeter has an impact on the accuracy of the calorific value calculation, wherein, is the absolute value, is the first heat, For the second heat, is the first difference threshold.
[0007] In one embodiment, when the mass of water in the calorimeter is M2, the third calorific value of benzoic acid having a mass of M1 is measured; When the mass of water in the calorimeter is M3, the fourth calorific value of benzoic acid with a mass of M1 is measured; Among them, M2 is smaller than M3; In response to , it is judged that the quality of water in the calorimeter has an impact on the accuracy of calculating the calorific value, wherein, For the third heat, For the fourth heat, is the second difference threshold.
[0008] In one embodiment, the process of obtaining the heat amount includes: Heat output is The product of the preset value, where , is the maximum temperature of the water in the calorimeter after the sample is burned, is the initial temperature of the water in the calorimeter after the sample has burned.
[0009] In one embodiment, the calculation formula of the preset value is: ,in, is the preset value, is the specific heat capacity of water, is the mass of water in the calorimeter, is the average specific heat capacity of the experimental substances in the calorimeter except water, is the mass of the test substance other than water in the calorimeter.
[0010] In one embodiment, the calorimeter comprises an oxygen bomb, which is used for combustion of the sample.
[0011] In one embodiment, a timer is used to measure the time required for the water to rise from an initial temperature to a maximum temperature.
[0012] In one embodiment, an air conditioning device is used to change the temperature of the environment in which the calorimeter is located.
[0013] Beneficial effects of the present invention: The temperature of the environment in which the calorimeter is located is measured by a first temperature sensor, so as to facilitate subsequent related experiments, and to determine whether the temperature has an impact on the accuracy of calculating the calorific value. The mass of water in the calorimeter is measured by an automatic weighing component, so as to facilitate subsequent related experiments, and to determine whether the mass of water has an impact on the accuracy of calculating the calorific value.
[0014] Considering that at higher ambient temperatures, the energy in the environment may be transferred to the water in the calorimeter, and at lower ambient temperatures, the energy in the calorimeter may be transferred to the environment, This indicates that the ambient temperature of the calorimeter has an impact on the accuracy of the calculated calorific value.
[0015] Considering that the mass of water in the inner cylinder of the calorimeter affects the speed at which water absorbs heat, This indicates that the quality of water in the calorimeter affects the accuracy of calorific value calculation. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 is a flowchart schematically illustrating a first experimental method according to an embodiment of the present invention; Figure 2 FIG. 4 is a flow chart schematically illustrating a second experimental method according to an embodiment of the present invention. DETAILED DESCRIPTION
[0017] The following will be combined with the drawings in 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 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 those skilled in the art without creative work are within the scope of protection of the present invention.
[0018] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.
[0019] A sample heat calculation experimental system comprises: a calorimeter and a first temperature sensor; the calorimeter comprises an automatic weighing component and a second temperature sensor; the calorimeter is used to measure the calorific value of the sample, for example, the sample may be a certain mass of coal, coke, etc.; the first temperature sensor is used to measure the ambient temperature of the calorimeter, that is, the temperature of the air around the calorimeter; the automatic weighing component is used to measure the mass of water in the calorimeter, generally speaking, the water refers to the water in direct contact with the oxygen bomb, or the water is in the inner cylinder of the calorimeter, and the main function of the water is to absorb the heat generated by the combustion of the substance; the second temperature sensor is used to measure the temperature of the water in the calorimeter.
[0020] It should be noted that the ambient temperature in this article refers to the temperature of the environment in which the calorimeter is located, unless otherwise specified. The water in the calorimeter in this article refers to the water in the inner cylinder of the calorimeter, or in other words, the "water" in this article refers to the water in the inner cylinder of the calorimeter, unless otherwise specified.
[0021] The following uses coal as an example to illustrate the importance of accurately measuring the calorific value of coal.
[0022] In the existing technology, it is often necessary to use a calorimeter to measure the calorific value of coal, because the calorific value of coal is one of the important indicators to measure its quality. More accurate calorific value measurement helps to accurately evaluate the combustion performance and energy value of coal, and provides a scientific basis for the purchase, storage, processing and utilization of coal. Moreover, in coal trade, the calorific value is often directly linked to the price of coal, and accurate measurement is crucial to safeguard the interests of both parties to the transaction.
[0023] Secondly, safety in production is of vital importance in the mining, processing and utilization of coal. More accurate calorific value measurement helps to understand the combustion characteristics and potential safety risks of coal, and provides a scientific basis for the formulation of safety production measures. By optimizing the combustion process and improving energy efficiency, the probability of safety accidents can be reduced and production safety can be guaranteed.
[0024] Therefore, for coal, it is of great significance to use a calorimeter to accurately measure the calorific value of coal.
[0025] However, in practice, it is found that the accuracy of measuring the calorific value of coal may be low. The following experiment is used to explore which factors affect the accuracy of measuring the calorific value of coal.
[0026] Next, we will explore whether the temperature of the calorimeter's environment affects the accuracy of the calorific value measurement. Since the calorific value of benzoic acid is known, we can use benzoic acid to conduct the experiment. The calorific value of benzoic acid is 26470 joules per gram.
[0027] Figure 1 FIG. 1 is a flow chart schematically showing a first experimental method according to an embodiment of the present invention. Figure 1 shown.
[0028] At a first ambient temperature, a calorimeter is used to measure the calorific value of benzoic acid with a mass of M1, and the calorific value is recorded as a first calorific value. The first ambient temperature satisfies: ,in, is the first ambient temperature, is the first coefficient, is the second coefficient, Less than 1, represents the initial temperature of the water in the calorimeter, the water is in direct contact with the oxygen bomb, or in other words, the water is the water in the inner cylinder of the calorimeter. The first ambient temperature is the temperature that satisfies The temperature of the calorimeter's surroundings under the given conditions.
[0029] The implementer can set the values of the first coefficient and the second coefficient according to the specific implementation scenario. For example, the first coefficient can be 0.5 and the second coefficient can be 0.3. In one embodiment, for example, the initial temperature of water can be 25 degrees. M1 is a preset value. The implementer can set M1 by himself, for example, M1 can be 1 gram.
[0030] The purpose of the above steps is to limit the temperature of the environment in which the calorimeter is located, and to measure the calorific value of benzoic acid when the ambient temperature is much lower than the initial temperature of the water.
[0031] It should be noted that the temperature of the environment in which the calorimeter is located can be changed by air conditioning transposition.
[0032] At the second ambient temperature, the calorific value of benzoic acid with a mass of M1 is measured and recorded as the second calorific value. The second ambient temperature satisfies: ,in, is the second ambient temperature, is the third coefficient, is the fourth coefficient, Greater than 1. The second ambient temperature satisfies The temperature of the calorimeter's surroundings under the given conditions.
[0033] The implementer can set the values of the third coefficient and the fourth coefficient according to the specific implementation scenario. For example, the third coefficient can be 1.5 and the fourth coefficient can be 1.7.
[0034] The purpose of the above steps is to limit the temperature of the environment in which the calorimeter is located, and to measure the calorific value of benzoic acid when the ambient temperature is much higher than the initial temperature of the water.
[0035] During the above experiment, the mass of water in the inner cylinder of the calorimeter should be kept constant. In order to ensure the accuracy of the experiment, other conditions should also be kept as constant as possible.
[0036] In response to , it is determined that the ambient temperature of the calorimeter has an impact on the accuracy of the calorific value calculation, wherein, is the absolute value, is the first heat, For the second heat, is the first difference threshold.
[0037] The implementer may set the first difference threshold according to a specific implementation scenario. For example, the first difference threshold may be 0.015.
[0038] The explanation is as follows: When the ambient temperature is too high, in the process of measuring the calorific value of coal, the energy in the environment is likely to be transferred into the water in the calorimeter, resulting in a low accuracy in measuring the calorific value of coal. When the ambient temperature is too low, in the process of measuring the calorific value of coal, the energy in the water in the calorimeter is likely to be transferred into the surrounding environment of the calorimeter, resulting in a small measured calorific value compared to the actual calorific value, resulting in a low accuracy in measuring the calorific value of coal. Therefore, based on the above experiment, in response to It is judged that the ambient temperature of the calorimeter has an impact on the accuracy of calculating the calorific value.
[0039] Next, we will explore whether the quality of water in the calorimeter affects the accuracy of calorific value measurement.
[0040] Figure 2 FIG. 2 is a flow chart schematically showing a second experimental method according to an embodiment of the present invention. Figure 2 shown.
[0041] When the mass of water in the calorimeter is M2, the calorific value of benzoic acid with a mass of M1 is measured, and the calorific value is recorded as the third calorific value. When the mass of water in the calorimeter is M3, the calorific value of benzoic acid with a mass of M1 is measured, and the calorific value is recorded as the fourth calorific value. Among them, M2 is less than M3.
[0042] The implementer can set M2 and M3 according to the specific implementation scenario. For example, M2 can be 800 grams and M3 can be 1600 grams.
[0043] During the above experiment, the temperature of the environment in which the calorimeter is located should be kept constant, for example, the temperature of the environment in which the calorimeter is located should be kept consistent with the initial temperature of the water in the inner cylinder of the calorimeter. In order to ensure the accuracy of the experiment, other conditions should also be kept constant as much as possible.
[0044] In response to , it is judged that the quality of water in the calorimeter has an impact on the accuracy of calculating the calorific value, wherein, For the third heat, For the fourth heat, is the second difference threshold.
[0045] The implementer may set the second difference threshold according to the specific implementation scenario. For example, the second difference threshold may be 0.01.
[0046] The explanation is as follows: the greater the mass of water in the calorimeter, the faster the water absorbs the heat emitted by the coal, and the greater the possibility that the energy of the coal is lost to the environment in which the calorimeter is located, and the smaller the absolute value of the difference between the measured calorific value and the true calorific value, and the greater the possibility that the measured calorific value of the coal is more accurate. The reason is that the greater the mass of water, the greater the temperature difference between the water and the oxygen bomb during the process of heat conduction by the oxygen bomb, and the faster the water absorbs the heat emitted by the coal.
[0047] When the mass of water in the calorimeter is small, the water absorbs the heat given off by the coal more slowly, causing more energy of the coal to be dissipated into the environment of the calorimeter, resulting in lower accuracy of the measured calorific value of the coal.
[0048] It should be noted that the time required for the water to rise from the initial temperature to the maximum temperature can be measured by a timer. The shorter the time, the faster the water absorbs the heat generated by the coal.
[0049] Therefore, based on the above experiments, in response to , it is judged that the quality of water in the calorimeter has an impact on the accuracy of calculating the calorific value.
[0050] In one embodiment, the calorific value of the coal can be directly obtained by a calorimeter. The method of using a calorimeter to measure the calorific value of a substance is a prior art and will not be described in detail here.
[0051] In another embodiment, the process of obtaining the calorific value includes: Heat output is The product of the preset value, where , is the maximum temperature of the water in the calorimeter after the sample is burned, is the initial temperature of the water in the calorimeter after the sample is burned. The sample may be benzoic acid or coal, etc.
[0052] The calculation formula of the preset value is: ,in, is the preset value, is the specific heat capacity of water, is the mass of water in the calorimeter, is the average specific heat capacity of the substances involved in the experiment except water in the calorimeter, is the mass of the substance involved in the test in the calorimeter except water. It is a constant and can be set by the implementer according to the specific implementation scenario.
[0053] In the description of this specification, "plurality" or "several" means at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.
[0054] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0055] In some of the processes described in the specification and claims of the present invention and the above-mentioned figures, multiple operations appearing in a specific order are included, but it should be clearly understood that these operations may not be executed in the order in which they appear in this article or executed in parallel. The serial numbers of the operations, such as S1, S2, etc., are only used to distinguish different operations, and the serial numbers themselves do not represent any execution order. In addition, these processes may include more or fewer operations, and these operations may be executed in sequence or in parallel. It should be noted that if descriptions such as "first", "second", "A1", "B1" appear in this article, their role is to distinguish different messages, devices, modules, etc., and do not represent the order of precedence, do not have any technical meaning, and do not limit "A1", "B1", "first" and "second" to different types. For example: the first feature of an image is the feature of the image. The role of adding "first" includes facilitating subsequent references to different objects, that is, facilitating indexing.
[0056] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.
Claims
1. A sample heat calculation experimental system, characterized in that: include: a calorimeter and a first temperature sensor; the calorimeter including an automatic weighing assembly and a second temperature sensor; The calorimeter is used to measure the calorific value of the sample; The first temperature sensor is used to measure the ambient temperature of the calorimeter; The automatic weighing assembly is used to measure the mass of water in the calorimeter; The second temperature sensor is used to measure the temperature of the water in the calorimeter.
2. A sample heat calculation experimental system according to claim 1, characterized in that: A sample heat calculation experimental method performed by the system includes: At a first ambient temperature, a first calorific value of benzoic acid with a mass of M1 is measured, and the first ambient temperature satisfies: ,in, is the first ambient temperature, is the first coefficient, is the second coefficient, Less than 1, represents the initial temperature of water in the calorimeter; At a second ambient temperature, a second calorific value of benzoic acid with a mass of M1 is measured, and the second ambient temperature satisfies: ,in, is the second ambient temperature, is the third coefficient, is the fourth coefficient, Greater than 1; In response to , it is determined that the ambient temperature of the calorimeter has an impact on the accuracy of the calorific value calculation, wherein, is the absolute value, is the first heat, For the second heat, is the first difference threshold.
3. A sample heat calculation experimental system according to claim 1, characterized in that: Also includes: When the mass of water in the calorimeter is M2, the third calorific value of benzoic acid with a mass of M1 is measured; When the mass of water in the calorimeter is M3, the fourth calorific value of benzoic acid with a mass of M1 is measured; Among them, M2 is smaller than M3; In response to , it is judged that the quality of water in the calorimeter has an impact on the accuracy of calculating the calorific value, wherein, For the third heat, For the fourth heat, is the second difference threshold.
4. A sample heat calculation experimental system according to claim 2 or 3, characterized in that: The process of obtaining heat includes: Heat output is The product of the preset value, where , is the maximum temperature of the water in the calorimeter after the sample is burned, is the initial temperature of the water in the calorimeter after the sample has burned.
5. A sample heat calculation experimental method according to claim 4, characterized in that: The calculation formula of the preset value is: ,in, is the preset value, is the specific heat capacity of water, is the mass of water in the calorimeter, is the average specific heat capacity of the experimental substances in the calorimeter except water, is the mass of the test substance other than water in the calorimeter.
6. A sample heat calculation experimental system according to claim 1, characterized in that: Also includes: The calorimeter comprises an oxygen bomb, which is used for burning the sample.
7. The sample heat calculation experimental system according to claim 1, characterized in that: Also includes: A timer is used to measure the time required for the water to rise from an initial temperature to a maximum temperature.
8. The sample heat calculation experimental system according to claim 1, characterized in that: Also includes: An air conditioning device is used to change the temperature of the environment in which the calorimeter is located.