Device for measuring moisture in powder sample and detection method

Abstract

The invention discloses a device for measuring moisture in a powder sample. The device comprises a heating unit, a reaction unit, a balance cavity and a detection unit, the heating unit is used as a platform structure, is arranged at the bottom of the reaction unit and is in contact with the reaction unit; the reaction unit is movably arranged on the heating unit and is used for bearing a sample and carrying out contact heating and drying on the sample through the heating unit; the balance cavity is arranged above the reaction unit, forms a closed space with the reaction unit, and is used for carrying out heating reaction on a sample; the balance cavity is further connected with a drying hole which is used for introducing dry gas into the balance cavity. The detection unit is arranged in the balance cavity and is used for detecting the moisture of the gas in the balance cavity. Meanwhile, the invention further discloses a moisture detection method using the device, heat conduction is rapidly carried out in a direct contact heating mode, rapid analysis is achieved, and the efficiency is high during online determination.

Description

Technical Field

[0001] The present application relates to the technical field of substance content detection, and more specifically, to a device for determining the moisture content in a powder sample, and a detection method. Background Art

[0002] In the field of coal quality analysis, moisture has an important influence on various indicators. However, when samples are transferred under different environments, the moisture in the samples will change due to diffusion equilibrium with the environment. Therefore, the rapid determination of moisture has important practical significance.

[0003] The commonly used measuring equipment for existing classic powder samples is the oven drying method, automatic instrument method, and thermogravimetric analysis method. The two methods can be divided into two-step method and one-step method according to the operating steps, and the drying is completed in a nitrogen or air flow. The two-step method is to first dry the sample (mainly coal samples in the standard) at 40°C to remove external water, and then dry it to constant weight at 107°C to remove internal water. Total water = external water + internal water; the one-step method is to directly dry it to constant weight at 107°C to obtain total water. However, the drying time according to the standard oven drying method and the instrument method requires more than one hour, which is inefficient and does not meet the requirements of rapid detection.

[0004] Therefore, there is an urgent need for a device that can quickly determine the moisture content in powder samples to achieve rapid detection of powder samples, especially in the field of coal quality analysis, to achieve efficient and rapid coal moisture detection. Summary of the invention

[0005] In order to solve the above technical problems, the present application provides a device for determining the moisture content in a powder sample. By quickly heating the heater and transferring the heat to the sample, a three-dimensional drying system is formed on the surface of the powder sample, thereby improving the analysis speed and performing online measurement through a detection sensor with high efficiency.

[0006] The present application provides a device for determining the moisture content in a powder sample, and the specific technical scheme is as follows, comprising: a heating unit, a reaction unit, a balance chamber, and a detection unit; The heating unit is a platform structure, disposed at the bottom of the reaction unit and in contact with the reaction unit; The reaction unit can be movably arranged on the heating unit to carry the sample, and the sample is contact-heated and dried by the heating unit; The balancing chamber is arranged on the reaction unit to form a closed space with the reaction unit for heating the sample; The balancing chamber is also connected to a drying hole for connecting and introducing dry gas into the balancing chamber; The detection unit is arranged in the balancing cavity and performs moisture detection on the gas in the balancing cavity.

[0007] Preferably, the reaction unit specifically comprises: a reactor, a tray and a cylinder injector; The receiving plate can move in a horizontal direction under the pushing action of the cylinder sample injector; The plate is moved above the reactor and outside the balance chamber to allow samples to enter and exit.

[0008] Preferably, the serving tray structure is a porous structure.

[0009] Preferably, the reactor is made of a metal material with good thermal conductivity and corrosion resistance.

[0010] Preferably, the outer surface of the balancing cavity is also coated with a thermal insulation layer.

[0011] Preferably, the detection unit is specifically a humidity sensor and an infrared detector, which are used to perform humidity and infrared detection on the water content in the gas in the balance chamber.

[0012] Preferably, the detection unit is specifically arranged at the top center of the balancing cavity.

[0013] Preferably, the drying hole in the balancing chamber is specifically arranged at the bottom of the balancing chamber.

[0014] Preferably, the specific type of dry gas introduced into the balance chamber by the drying hole is: dry air or nitrogen.

[0015] At the same time, the present application also provides a method for detecting moisture in a powder sample using the above-mentioned device for determining moisture in a powder sample. The specific detection steps are as follows: (1) Placing the sample on the reaction unit and then entering the equilibrium chamber; (2) heating the lower surface of the reaction unit by the heating unit to dry the sample; (3) simultaneously introducing dry gas into the balancing chamber through the drying hole and mixing the dry gas in the balancing chamber; (4) Using a detection unit disposed in the balancing chamber to detect the moisture content of the gas in the balancing chamber The device for determining the moisture content in a powder sample provided by the present invention uses a direct contact heating form, and the sample tray and the heating unit quickly conduct heat, so that the moisture analysis speed is fast and the efficiency is high during online determination; and compared with a traditional oven, the device can form a three-dimensional drying system on the surface of the powder sample, and the ventilation rate is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of a cross-sectional front view of the structure of a device for measuring moisture in a powder sample provided by an embodiment of the present invention; Figure 2 A schematic diagram of a cross-sectional side view of the structure of a device for measuring moisture in a powder sample provided by an embodiment of the present invention.

[0018] Figure numerals: 1. heating unit; 2. balancing chamber; 3. insulation layer; 4. humidity sensor; 5. serving tray; 6. cylinder sampler; 7. drying hole; 8. infrared sensor. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] It should be noted that when an element is referred to as being "fixed on" or "set on" another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0021] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0023] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0024] This specific embodiment of the present invention is written in a progressive manner.

[0025] The embodiment of the present invention provides a device for determining the moisture content in a powder sample, which mainly includes: a heating unit, a reaction unit, a balance chamber, and a detection unit; like Figure 1 and Figure 2 As shown, in this embodiment, the heating unit serves as an installation platform for the entire device for determining the moisture in the anti-wear sample, is disposed at the bottom of the reaction unit, and contacts the lower surface of the reaction unit; The reaction unit can be movably arranged on the heating unit to carry the sample. The lower surface of the reaction unit contacts the heating unit, and the sample is dried under the action of heat conduction. At the same time, in order to make the heating of the sample more uniform and efficient, in this embodiment, the heating unit evenly heats the lower surface of the reaction unit so that the sample can be evenly heated to evaporate water. The balancing chamber is arranged above the reaction unit, and forms a three-dimensional drying system with the reaction unit in a closed space, which is used to heat the sample and accelerate the drying speed of the sample; The balancing chamber is also provided with a drying hole and the detection unit. By mixing the dry gas introduced into the balancing chamber under pressure, the detection unit collects the average humidity and converts it into the average concentration of water vapor in the balancing chamber, thereby quantifying the moisture.

[0026] Preferably, in this embodiment, the specific structure of the reaction unit is further defined as follows: Figure 1 and Figure 2 As shown, in this embodiment, the reaction unit specifically includes: a reactor, a tray and a cylinder injector; The receiving plate can move in a horizontal direction under the driving action of the cylinder sample injector; The horizontal movement of the serving plate above the reactor and outside the balancing chamber is achieved to facilitate the entry and exit of samples and improve the continuous detection speed of samples.

[0027] Furthermore, in this embodiment, the specific structure of the serving tray is further limited. In order to increase the drying speed of the sample, in the embodiment, the serving tray has a porous structure, which improves the air convection performance and has the characteristic of high moisture drying efficiency.

[0028] Furthermore, in this embodiment, the specific material of the reactor is further limited. In order to improve the thermal conductivity and durability of the reactor, the material of the reactor is specifically a metal material with good thermal conductivity and corrosion resistance. Specifically in this embodiment, the reactor is made of aluminum alloy or copper alloy.

[0029] Preferably, in order to better measure the water vapor in the balance chamber and prevent it from liquefying, in this embodiment, Figure 1 and Figure 2 As shown, the outer surface of the balancing cavity is also covered with a heat-insulating layer. In this embodiment, the heat-insulating layer is specifically a heat-insulating cotton material, which is used to insulate the air path and prevent water vapor condensation.

[0030] Furthermore, in order to accurately measure the water vapor in the balance chamber to determine the moisture content in the sample; in this embodiment, the specific types of the detection unit are humidity sensors and infrared detectors, which use humidity determination and infrared methods to perform humidity and infrared detection on the moisture in the gas in the balance chamber; When measuring by humidity method, the water vapor precipitated by drying is collected in the balance chamber and mixed under the pressure of the medium gas introduced into the drying hole. The humidity sensor collects the average humidity and converts it into the average concentration of water vapor in the balance chamber, thereby quantifying the moisture. When an infrared detector is used to measure water vapor, the thermal insulation layer is used to insulate the gas path to prevent water vapor condensation. The infrared detector has built-in pressure collection and flow stabilization devices, and the precipitated water vapor is used to measure moisture in a flowing state.

[0031] Furthermore, in order to accurately measure the water vapor in the balance chamber, the specific installation positions of the humidity sensor and the infrared detector in this embodiment are further determined, such as Figure 1 and Figure 2 As shown, in this embodiment, the detection unit is specifically arranged at the top center of the balancing cavity. More specifically, the humidity sensor is arranged inside the balancing cavity, and the infrared detector is arranged at the top of the balancing cavity.

[0032] As a preferred method, in order to better mix the medium gas introduced into the balancing chamber under pressure, Figure 2 As shown, in this embodiment, the drying holes in the balancing chamber are specifically located at the bottom of the balancing chamber, and ventilation from bottom to top can make the water vapor mix more evenly.

[0033] Furthermore, in this embodiment, the specific drying gas type in the drying hole is further limited. In this embodiment, in order to better dry the sample, the introduced gas is specifically air or nitrogen; specifically, for bituminous coal or anthracite, air is introduced for drying; for lignite, nitrogen is introduced for drying.

[0034] At the same time, this application also provides a moisture detection method, the specific steps are as follows: 1. Place the sample on the reaction unit and then place it into the balance chamber; 2. Heating the lower surface of the reaction unit by the heating unit to dry the sample; 3. At the same time, dry gas is introduced into the balancing chamber through the drying hole and mixed in the balancing chamber; 4. Utilize the detection unit disposed in the balancing chamber to detect the moisture content of the gas in the balancing chamber.

[0035] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for determining the moisture content in a powder sample, characterized in that: include: Heating unit, reaction unit, balancing chamber, detection unit; The heating unit is a platform structure, disposed at the bottom of the reaction unit and in contact with the reaction unit; The reaction unit can be movably arranged on the heating unit to carry the sample, and the sample is contact-heated and dried by the heating unit; The balancing chamber is arranged on the reaction unit to form a closed space with the reaction unit for heating the sample; The balancing chamber is also connected to a drying hole for connecting and introducing dry gas into the balancing chamber; The detection unit is arranged in the balancing cavity and performs moisture detection on the gas in the balancing cavity.

2. The device for measuring water content in a powder sample according to claim 1, characterized in that: The reaction unit specifically comprises: a reactor, a serving plate and a cylinder injector; The receiving plate can move in a horizontal direction under the driving action of the cylinder sample injector; The plate is moved above the reactor and outside the balance chamber to allow samples to enter and exit.

3. The device for measuring water content in a powder sample according to claim 2, characterized in that: The serving plate structure is a porous structure.

4. The device for measuring water content in a powder sample according to claim 3, characterized in that: The reactor is made of a metal material with good thermal conductivity and corrosion resistance.

5. The device for measuring water content in a powder sample according to claim 1, characterized in that: The outer surface of the balance cavity is also coated with a heat-insulating layer.

6. The device for measuring water content in a powder sample according to claim 5, characterized in that: The detection unit is specifically a humidity sensor and an infrared detector, which are used to perform humidity and infrared detection on the water content in the gas in the balance cavity.

7. The device for measuring water content in a powder sample according to claim 6, characterized in that: The detection unit is specifically arranged at the top center of the balancing cavity.

8. The device for measuring water content in a powder sample according to claim 1, characterized in that: The drying hole in the balancing cavity is specifically arranged at the bottom of the balancing cavity.

9. The device for measuring water content in a powder sample according to claim 8, characterized in that: The specific type of dry gas introduced into the balance chamber by the drying hole is: dry air or nitrogen.

10. This application also provides a method for detecting moisture in a powder sample, the specific steps of which are as follows: (1) Placing the sample on the reaction unit and then entering the equilibrium chamber; (2) heating the lower surface of the reaction unit by the heating unit to dry the sample; (3) simultaneously introducing dry gas into the balancing chamber through the drying hole and mixing the dry gas in the balancing chamber; (4) Detecting the moisture content of the gas in the balancing chamber using a detection unit disposed in the balancing chamber.

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