Split type intelligent constant-temperature water circulation system of combustion heat value calorimeter and control method

Abstract

The invention discloses a split type intelligent constant-temperature water circulation system of a combustion heat value calorimeter and a control method. The split type intelligent constant-temperature water circulation system comprises a first constant-temperature water tank, a second constant-temperature water tank, a filtering device, a power device, the calorimeter, a data acquisition controller and control equipment, the control equipment is connected with the data acquisition controller; the data acquisition controller is connected with the first constant-temperature water tank, the second constant-temperature water tank and the calorimeter; the first constant-temperature water tank is connected with the second constant-temperature water tank through the filtering device and the power device; the first constant-temperature water tank is connected with the calorimeter through the power device and the filtering device; and the second constant-temperature water tank is connected with the calorimeter. The two-stage split type constant-temperature water tanks (namely the first constant-temperature water tank and the second constant-temperature water tank) are used for accurately controlling the temperature of circulating water, and the adverse effects of vibration, heating and spatial positions of other structures and electrical components on the testing process of the calorimeter are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of combustion calorimeters, and in particular relates to a split intelligent constant temperature water circulation system of a combustion calorimeter. Background Art

[0002] At present, the calorific value of material combustion is usually tested using a calorimeter, such as the standards GB / T 14402-2007 and IOS 1716:2018. The principle is to put a certain mass of material into a container of pure oxygen for full combustion, absorb the combustion heat through the water outside the container, and then calculate the calorific value of the material based on the tested water temperature rise, material mass, calorific value of the combustion aid and water equivalent of the test facility. The specific calculation formula is as follows: PCS: total calorific value of material combustion, MJ / kg; E: water equivalent of the calorimeter equipment and its accessories and test circulating water, MJ / K; Ti: initial temperature, K; Tm: Maximum temperature rise during the test, K; b: Combustion calorific value of the combustion supporting material, MJ; m: material mass, kg.

[0003] Among the parameters in the above calculation process, the material mass can be tested with a balance and can be accurate to three decimal places; the combustion-supporting material is generally a standard substance, and its calorific value can be calculated through mass; the water equivalent is obtained through regular calibration. These three parameters need to be manually entered into the calorimeter test software before testing. Only the water temperature rise parameter needs to be obtained through experimental testing. Therefore, the key step in the calorific value test process is the water temperature test. Therefore, the stability of the water temperature of the water circulation system used in the material combustion calorific value test is crucial to the accuracy of the test results.

[0004] The water circulation system of existing combustion calorific value testing instruments is usually concentrated inside a calorimeter, including an inner cylinder and an outer cylinder, wherein the outer cylinder is used to store test water. During the test, the water in the outer cylinder with stable water temperature is discharged into the inner cylinder. After the combustion test and water temperature test are completed in the inner cylinder, the water in the inner cylinder is discharged into the outer cylinder.

[0005] The disadvantages of this water circulation technology include: (1) unstable water temperature. The water circulation process of traditional technology tests is often a simple circulation between the inner and outer cylinders. The water temperature fluctuates with the test environment, especially when the temperature difference of the external environment is large, resulting in large errors in the test results at different time periods on the same day. (2) During multiple consecutive tests, the test water in the box continuously absorbs the heat of material combustion, causing the water temperature in the circulation system to continue to rise, which not only prolongs the stabilization time of the initial water temperature in the next test and reduces the test efficiency, but also causes large fluctuations in water temperature, resulting in further errors in the test results. (3) The test water is repeatedly used without purification, resulting in a lot of dirt in the inner cylinder water. Since the specific heat capacity of dirt and water is different, it will affect the water equivalent parameters of the test instrument and water, as well as the water temperature rise test during the test process. (4) The traditional centralized water circulation system and calorific value measurement system are both inside the same calorimeter equipment. The operation of the equipment, including the vibration and heat generation of the water pump and solenoid valve, will have a certain impact on the calorific value test results. Summary of the invention

[0006] In order to overcome the above technical defects, the present invention provides a split intelligent constant temperature water circulation system for a combustion calorific value calorimeter, which can reduce the impact of the test environment on the test water temperature.

[0007] The present invention is achieved through the following scheme: A split type intelligent constant temperature water circulation system for a combustion calorific value calorimeter, comprising: a first constant temperature water tank, a second constant temperature water tank, a filtering device, a power device, a calorimeter, a data acquisition controller and a control device; The control device is connected to the data acquisition controller; The data acquisition controller is connected to the first constant temperature water tank, the second constant temperature water tank, and the calorimeter; The first constant temperature water tank is connected to the second constant temperature water tank through the filtering device and the power device; The first constant temperature water tank is connected to the calorimeter through the power device and the filter device; The second constant temperature water tank is connected to the calorimeter.

[0008] As a further improvement of the present invention, the first constant temperature water tank comprises: a first water tank body, a first temperature control device; The first temperature control device is arranged in the first water tank body, connected to the control device, and started under the control of the control device.

[0009] As a further improvement of the present invention, the first constant temperature water tank further includes: a first liquid level sensor and a first thermometer which are arranged inside the first water tank body and connected to the data acquisition controller.

[0010] As a further improvement of the present invention, a first water injection port is provided on the insulation cover of the first constant temperature water tank; A first drain port is provided at the lower portion of the first constant temperature water tank.

[0011] As a further improvement of the present invention, a first solenoid valve and a second solenoid valve are provided on the pipe connecting the first constant temperature water tank and the calorimeter; A third solenoid valve and a fourth solenoid valve are provided on the pipe connecting the first constant temperature water tank and the second constant temperature water tank; A fifth solenoid valve and a sixth solenoid valve are provided on the pipeline connecting the second constant temperature water tank and the calorimeter; The first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve, the fifth solenoid valve, and the sixth solenoid valve are all connected to the control device and are opened or closed under the control of the control device.

[0012] As a further improvement of the present invention, the second constant temperature water tank comprises: a second water tank body, a second temperature control device; The second temperature control device is arranged in the second water tank body, connected to the control device, and started under the control of the control device.

[0013] As a further improvement of the present invention, the second constant temperature water tank further includes: a second liquid level sensor and a second thermometer which are arranged inside the second water tank body and connected to the data acquisition controller.

[0014] As a further improvement of the present invention, a second water inlet is provided on the insulation cover of the second constant temperature water tank; A second drain port is provided at the lower portion of the second constant temperature water tank.

[0015] The present invention also provides a control method for a split-type intelligent constant temperature water circulation system of a combustion calorific value calorimeter, which is used to control the split-type intelligent constant temperature water circulation system, comprising the steps of: After preheating treatment of the split-type intelligent constant temperature water circulation system, the water in the calorimeter is discharged into the second constant temperature water tank; The water in the first constant temperature water tank is transported to the calorimeter, and the combustion test is started after the water temperature stabilizes; The circulating water remaining in the pipe connecting the first constant temperature water tank and the calorimeter is transported to the second constant temperature water tank; After the combustion test is completed, the water in the second constant temperature water tank is injected into the first constant temperature water tank, and the measured temperature data is sent to the control device.

[0016] As a further improvement of the present invention, the step of preheating the split-type intelligent constant temperature water circulation system includes: Controlling the initial water temperature of the first constant temperature water tank and the initial water temperature of the second constant temperature water tank to reach the set value; The water in the first constant temperature water tank is transported to the calorimeter, and the calorimeter is preheated by circulating water so that the temperature of the water in the calorimeter is consistent with the temperature of the circulating water; When the water temperature inside the calorimeter is stable and the flow stops, the water in the calorimeter is discharged into the second constant temperature water tank.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: the split intelligent constant temperature water circulation system of the present invention simplifies the structure of the water circulation of the combustion calorific value test calorimeter, separates the power device and the outer cylinder water storage tank, and uses a two-stage split constant temperature water tank (i.e., a first constant temperature water tank and a second constant temperature water tank) to accurately control the circulating water temperature, thereby reducing the adverse effects of vibration, heat generation and spatial position of other structures and electrical components on the calorimeter test process, and the split intelligent constant temperature water tank can keep the calorimeter test water clean, significantly reduce the impact of the test environment on the test water temperature, and shorten the time for continuous tests to wait for the water temperature to stabilize again, thereby greatly improving the accuracy of the combustion calorific value test results and the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the overall structure of the split-type intelligent constant temperature water circulation system described in Example 1.

[0019] Explanation of the reference numerals: 1. first constant temperature water tank; 11. first water tank body; 12. first temperature control device; 13. first liquid level sensor; 14. first water inlet; 15. first drain outlet; 16. first solenoid valve; 17. third solenoid valve; 18. first thermometer; 2. second constant temperature water tank; 21. second water tank body; 22. second temperature control device; 23. second liquid level sensor; 24. second water inlet; 25. second drain outlet; 26. fourth solenoid valve; 27. fifth solenoid valve; 28. second thermometer; 3. filtering device; 4. power device; 5. calorimeter; 51. water inlet; 52. water outlet; 53. third drain outlet; 54. second solenoid valve; 55. sixth solenoid valve; 6. data acquisition controller; 7. control device. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0021] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0022] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0023] It should be noted that similar reference numerals and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in the subsequent figures. At the same time, in the description of the present invention, the serial numbers of each step are only used to distinguish between steps, and do not mean that each step needs to be strictly executed in the order of the serial numbers.

[0024] Example 1 This embodiment provides a split-type intelligent constant temperature water circulation system for a combustion calorimeter 5, such as Figure 1 As shown, it includes: a first constant temperature water tank 1, a second constant temperature water tank 2, a filtering device 3, a power device 4, a calorimeter 5, a data acquisition controller 6 and a control device 7; the control device 7 is connected to the data acquisition controller 6; the data acquisition controller 6 is connected to the first constant temperature water tank 1, the second constant temperature water tank 2 and the calorimeter 5; the first constant temperature water tank 1 is connected to the second constant temperature water tank 2 through the filtering device 3 and the power device 4; the first constant temperature water tank 1 is connected to the calorimeter 5 through the power device 4 and the filtering device 3; the second constant temperature water tank 2 is connected to the calorimeter 5.

[0025] The power device 4 includes: a first water pump and a second water pump, and the filtering device 3 includes: a first filter and a second filter. The first water pump is arranged on the pipeline connecting the first constant temperature water tank 1 and the calorimeter 5, and the second water pump is arranged on the pipeline connecting the first constant temperature water tank 1 and the second constant temperature water tank 2.

[0026] The first constant temperature water tank 1 controls the temperature of the stored pure water at a set value, and provides the calorimeter 5 with initial circulating water of constant temperature; the second constant temperature water tank 2 is used to absorb the high temperature water after the combustion calorific value calorimeter 5 tests, and initially cools the high temperature water to a certain temperature range, and then discharges it into the first constant temperature water tank 1 to further stabilize the water temperature. The filter is used to purify the circulating water, and the filter is activated to intercept the impurities of the circulating water through the filter; the water pump is used to control the flow rate of flushing and draining water. The calorimeter 5 is provided with a water tank, and the water tank is provided with a water inlet, a water outlet and a third drain outlet. The water inlet is connected to the first constant temperature water tank 1, and the water outlet is connected to the second constant temperature water tank 2. The calorimeter 5 is used to test the combustion calorific value.

[0027] Furthermore, the first constant temperature water tank 1 comprises: a first water tank body 11, a first temperature control device 12; the first temperature control device 12 is arranged in the first water tank body 11, and is connected to the control device 7, and is started under the control of the control device 7. The first water tank body 11 is made of metal or ceramic material, with a capacity of 3L~10L, and is used to store circulating water. The first temperature control device 12 is used to heat or cool the water in the first water tank body 11. The first temperature control device 12 has heating and cooling functions. The temperature of the water in the first water tank body 11 is set and automatically controlled by the control device 7, and the water temperature can be kept within the range of 15~30°C.

[0028] The first constant temperature water tank 1 further includes: a first liquid level sensor 13 disposed inside the first water tank body 11 and connected to the data acquisition controller 6 , for acquiring water level information in the first water tank body 11 .

[0029] A first water inlet 14 is provided on the insulating cover of the first constant temperature water tank 1 ; a first drain outlet 15 is provided at the lower part of the first constant temperature water tank 1 (i.e., on the side wall close to the bottom); when in use, water can be filled into the first water tank body 11 through the first water inlet 14 , and the water in the first water tank body 11 can be drained through the first drain outlet 15 .

[0030] The first solenoid valve 16 and the second solenoid valve 51 are arranged on the pipeline connecting the first constant temperature water tank 1 and the calorimeter 5; the third solenoid valve 17 and the fourth solenoid valve 26 are arranged on the pipeline connecting the first constant temperature water tank 1 and the second constant temperature water tank 2; the fifth solenoid valve 27 and the sixth solenoid valve 55 are arranged on the pipeline connecting the second constant temperature water tank 2 and the calorimeter 5. The first solenoid valve 16, the second solenoid valve 51, the third solenoid valve 17, the fourth solenoid valve 26, the fifth solenoid valve 27 and the sixth solenoid valve 55 are all connected to the control device 7 and are opened or closed by the control device 7.

[0031] The second constant temperature water tank 2 includes: a second water tank body 21 and a second temperature control device 22; the second temperature control device 22 is arranged in the second water tank body 21 and is connected to the control device 7, and is started under the control of the control device 7. Similarly, the second water tank body 21 is made of metal or ceramic material, with a capacity of 3L~10L, and is used to store circulating water. The second temperature control device 22 is used to heat or cool the water in the second water tank body 21. The second temperature control device 22 has heating and cooling functions.

[0032] The second constant temperature water tank 2 further includes: a second liquid level sensor 23 disposed inside the second water tank body 21 and connected to the data acquisition controller 6 , for acquiring water level information in the second water tank body 21 .

[0033] A second water inlet 24 is provided on the heat-insulating cover of the second thermostatic water tank 2 ; a second water outlet 25 is provided at the lower portion of the second thermostatic water tank 2 .

[0034] In addition, a first thermometer 18 is provided in the first water tank body 11 for obtaining the temperature of the water in the first water tank body 11, and the first thermometer 18 is connected to the data acquisition controller 6; a second thermometer 28 is provided in the second water tank body 21 for obtaining the temperature of the water in the second water tank body 21, and the second thermometer 28 is connected to the data acquisition controller 6.

[0035] In the specific implementation process, the first water tank body 11 is provided with a first quick interface and a second quick interface, the first solenoid valve 16 is provided between the first water tank body 11 and the first quick interface, the third solenoid valve 17 is provided between the first water tank body 11 and the second quick interface, the second water tank body 21 is provided with a third quick interface and a fourth quick interface, the fourth solenoid valve 26 is provided between the third quick interface and the second water tank body 21, the fifth solenoid valve 27 is provided between the fourth quick interface and the second water tank body 21, the fifth quick interface is provided at the water inlet of the calorimeter 5, the second solenoid valve 54 is provided between the fifth quick interface and the water inlet, the sixth quick interface is provided at the water outlet of the calorimeter 5, and the sixth solenoid valve 55 is provided between the sixth quick interface and the water outlet. Among them, the second solenoid valve 51 and the sixth solenoid valve 55 are three-way solenoid valves, which can realize the control of the flow direction of water; the first solenoid valve 16, the third solenoid valve 17, the fourth solenoid valve 26, and the fifth solenoid valve 27 are all two-way solenoid valves for controlling water flow. The quick interfaces are connected via water pipes, which are made of PVC.

[0036] The control device analyzes and calculates the data collected by the data acquisition controller, and sends instructions based on the data analysis results; the data acquisition controller sends the collected temperature signals, liquid level signals, flow rate signals and other parameters to the control device, and controls the temperature, flow rate and flow rate of water in the water circulation system according to the instructions of the control device. Among them, the temperature signal is obtained by the thermometer, and the flow rate signal can be obtained through the power device.

[0037] The split intelligent constant temperature water circulation system of the present embodiment simplifies the structure of the water circulation of the combustion calorific value test calorimeter, separates the water pump and the outer cylinder water storage tank, and uses a two-stage split constant temperature water tank (that is, the first constant temperature water tank and the second constant temperature water tank are used to replace the outer cylinder water storage tank in the prior art) to accurately control the circulating water temperature, thereby reducing the adverse effects of vibration, heat generation and spatial position of other structures and electrical components on the calorimeter test process. The split intelligent constant temperature water tank can keep the calorimeter test water clean, significantly reduce the impact of the test environment on the test water temperature, and shorten the time for continuous testing to wait for the water temperature to stabilize again, thereby greatly improving the accuracy of the combustion calorific value test results and the test efficiency.

[0038] Example 2 This embodiment provides a control method for a split-type intelligent constant temperature water circulation system of a combustion calorific value calorimeter, which is used to control the system in Embodiment 1, and includes the following steps: S1. Before the initial test, the split-type intelligent constant temperature water circulation system should be preheated: S11. Control the initial water temperature of the first constant temperature water tank and the initial water temperature of the second constant temperature water tank to reach the set value. It should be noted that after the water temperature reaches the set value, it should be stable for at least ten minutes.

[0039] S12, the control device controls the first water pump, the first solenoid valve, and the second solenoid valve to open, and delivers the water in the first constant temperature water tank to the calorimeter, and preheats the calorimeter through the circulating water, so that the temperature of the water in the calorimeter is consistent with the temperature of the circulating water.

[0040] S13. When the water temperature inside the calorimeter is stable and stops flowing, the water in the calorimeter is discharged into the second constant temperature water tank.

[0041] S2. The operator enters the sample information, and the control device controls the first water pump and the second solenoid valve to open, and the water in the first constant temperature water tank is transported to the calorimeter. After the water temperature stabilizes, the combustion test begins.

[0042] S3, conveying the circulating water remaining in the pipe connecting the first constant temperature water tank and the calorimeter to the second constant temperature water tank, so as to keep the water temperature entering the water tank of the calorimeter stable.

[0043] S4. The combustion test time is usually 15 to 25 minutes. After the combustion test is completed, the water in the second constant temperature water tank is injected into the first constant temperature water tank, and the temperature data measured by the calorimeter is sent to the control device by the data acquisition controller.

[0044] S5. Drain the water inside the calorimeter into the second constant temperature water tank for temperature control.

[0045] Through the above steps, one combustion test is completed, and steps S12 to S5 can be repeated for multiple tests.

[0046] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A split intelligent constant temperature water circulation system for a combustion calorimeter, characterized in that: include: A first constant temperature water tank, a second constant temperature water tank, a filtering device, a power device, a calorimeter, a data acquisition controller and a control device; The control device is connected to the data acquisition controller; The data acquisition controller is connected to the first constant temperature water tank, the second constant temperature water tank, and the calorimeter; The first constant temperature water tank is connected to the second constant temperature water tank through the filtering device and the power device; The first constant temperature water tank is connected to the calorimeter through the power device and the filter device; The second constant temperature water tank is connected to the calorimeter.

2. The split-type intelligent constant temperature water circulation system according to claim 1 is characterized in that: The first constant temperature water tank comprises: a first water tank body and a first temperature control device; The first temperature control device is arranged in the first water tank body, connected to the control device, and started under the control of the control device.

3. The split-type intelligent constant temperature water circulation system according to claim 2 is characterized in that: The first constant temperature water tank also includes: a first liquid level sensor and a first thermometer which are arranged inside the first water tank body and connected to the data acquisition controller.

4. The split-type intelligent constant temperature water circulation system according to claim 2 or 3, characterized in that: The first thermostatic water tank is provided with a first water inlet on the insulation cover; A first drain port is provided at the lower portion of the first constant temperature water tank.

5. The split-type intelligent constant temperature water circulation system according to claim 2 is characterized in that: A first solenoid valve and a second solenoid valve are provided on the pipeline connecting the first constant temperature water tank and the calorimeter; A third solenoid valve and a fourth solenoid valve are provided on the pipe connecting the first constant temperature water tank and the second constant temperature water tank; A fifth solenoid valve and a sixth solenoid valve are provided on the pipeline connecting the second constant temperature water tank and the calorimeter; The first solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve, the fifth solenoid valve, and the sixth solenoid valve are all connected to the control device and are opened or closed under the control of the control device.

6. The split-type intelligent constant temperature water circulation system according to claim 2 is characterized in that: The second constant temperature water tank comprises: a second water tank body and a second temperature control device; The second temperature control device is arranged in the second water tank body, connected to the control device, and started under the control of the control device.

7. The split-type intelligent constant temperature water circulation system according to claim 6 is characterized in that: The second constant temperature water tank also includes: a second liquid level sensor and a second thermometer which are arranged inside the second water tank body and connected to the data acquisition controller.

8. The split-type intelligent constant temperature water circulation system according to claim 6 or 7, characterized in that: A second water inlet is provided on the insulation cover of the second constant temperature water tank; A second drain port is provided at the lower portion of the second constant temperature water tank.

9. A control method for a split-type intelligent constant temperature water circulation system of a combustion calorimeter, characterized in that: Used to control the split-type intelligent constant temperature water circulation system according to any one of claims 1 to 8, comprising the steps of: After preheating treatment of the split-type intelligent constant temperature water circulation system, the water in the calorimeter is discharged into the second constant temperature water tank; The water in the first constant temperature water tank is transported to the calorimeter, and the combustion test is started after the water temperature stabilizes; The circulating water remaining in the pipe connecting the first constant temperature water tank and the calorimeter is transported to the second constant temperature water tank; After the combustion test is completed, the water in the second constant temperature water tank is injected into the first constant temperature water tank, and the measured temperature data is sent to the control device; Drain the water inside the calorimeter into the second constant temperature water tank.

10. The control method according to claim 9, characterized in that: The steps of preheating the split-type intelligent constant temperature water circulation system include: Controlling the initial water temperature of the first constant temperature water tank and the initial water temperature of the second constant temperature water tank to reach the set value; The water in the first constant temperature water tank is transported to the calorimeter, and the calorimeter is preheated by circulating water so that the temperature of the water in the calorimeter is consistent with the temperature of the circulating water; When the water temperature inside the calorimeter is stable and the flow stops, the water in the calorimeter is discharged into the second constant temperature water tank.

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