CN109270119B - Open type online measurement system and measurement method for calorific value of pulverized coal - Google Patents
Open type online measurement system and measurement method for calorific value of pulverized coal Download PDFInfo
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- CN109270119B CN109270119B CN201811325664.XA CN201811325664A CN109270119B CN 109270119 B CN109270119 B CN 109270119B CN 201811325664 A CN201811325664 A CN 201811325664A CN 109270119 B CN109270119 B CN 109270119B
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- G01N25/30—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on combustion or catalytic oxidation, e.g. of components of gas mixtures the rise in temperature of the gases resulting from combustion being measured directly using electric temperature-responsive elements
- G01N25/32—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on combustion or catalytic oxidation, e.g. of components of gas mixtures the rise in temperature of the gases resulting from combustion being measured directly using electric temperature-responsive elements using thermoelectric elements
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Abstract
The invention discloses an open type online measurement system for the calorific value of pulverized coal, which comprises: the coal powder sampling and weighing unit is used for weighing sampled coal powder; the clamping device is used for transferring the weighed pulverized coal to the heat measuring device and transferring the burned pulverized coal to the cleaning unit; the heat measuring device burns the coal dust transferred by the clamping device, collects temperature and flow data of the heating value of the coal dust and transmits the temperature and flow data to the data processing unit; the data processing unit is used for receiving and processing the temperature and flow data and calculating the heating value of the pulverized coal according to the weighing quality of the pulverized coal sampling and weighing unit; and the cleaning unit is used for cleaning residual ash after the pulverized coal is combusted. The invention also discloses a measuring method based on the pulverized coal heating value open type online measuring system. The open type online measurement system and the measurement method for the calorific value of the pulverized coal, provided by the invention, avoid the complicated manual loading and unloading and replacement of the oxygen bomb in the oxygen bomb calorimeter, can rapidly measure the calorific value of the pulverized coal online, and improve the working efficiency and the automation level.
Description
Technical Field
The invention relates to the field of detection systems, in particular to an open type online measurement system and a measurement method for the calorific value of pulverized coal.
Background
The calorific value of coal is also called coal big card, which refers to the heat generated by coal during combustion. The calorific value of coal is a main factor for testing the quality of coal, and is also an important link of power coal pricing, and the level of the calorific value of the coal has important influence on the aspects of economy, environmental protection and the like of the operation of a coal-fired power plant.
The most widely used coal dust calorific value measuring method in coal-fired power plants at present is an oxygen bomb method, a certain amount of coal dust sample is weighed and then placed in a crucible, and the crucible is placed in a stainless steel container (oxygen bomb). High pressure oxygen is charged into the combustion vessel/bomb. The sample is ignited in the oxygen bomb through ignition wires and cotton wires, and all organic matters in the oxygen bomb are burnt and oxidized to release certain heat (sulfuric acid generating heat). The inner barrel is filled with water, so that the water surrounds the periphery of the oxygen bomb, and heat generated during combustion can be transferred to the water around the oxygen bomb. The heating value of the pulverized coal can be calculated by measuring and calculating the temperature rise of water. The oxygen bomb method has the advantages of simple measurement principle and reliable result, but needs manual sampling, has high operation requirement, and has large hysteresis of measurement result because the measurement needs to be carried out in a laboratory.
In the existing online pulverized coal calorific value detection technology, a fuel measurement model is built by carrying out statistical analysis on measured values related to before and after combustion and on site operation data, so as to predict the calorific value of pulverized coal. However, since a large amount of data is required for early statistical analysis in establishing the model, and the model has low universality for different coal types, the online measurement capability is limited.
The patent publication of CN207148021U discloses an improved calorimeter, and the device includes an oxygen bomb with a cover body and a bomb tube, wherein a light-gathering component and an oxygen bomb head component are arranged on the cover body, the axis of the oxygen bomb head component is collinear with the axis of the cover body, and the improved calorimeter also comprises a light emitter, and light beams of the light emitter are injected into the bomb tube through a light-passing hole of the light-gathering component, so that the functions of automatic oxygenation and light-spot firing can be realized simultaneously. However, the device has the defects that oxygen bombs and crucibles are required to be manually placed, the burnt crucibles cannot clean residual ash on line, and on-line measurement cannot be realized.
The patent publication of CN106324030A discloses an automatic multi-bomb sample injection calorimeter system and a working method thereof, wherein the system comprises a platform with a plurality of grooves for storing oxygen bomb, a moving mechanism arranged on the platform, an oxygen bomb storage and transportation device of an oxygen bomb grabbing and clamping mechanism arranged on the moving mechanism and driven by the moving mechanism, a calorimeter and a control module; the calorimeter comprises an outer cylinder and an oxygen bomb cover, and an oxygen bomb hanging and buckling unit is arranged on the lower surface of the oxygen bomb cover; the control module is respectively connected with the moving mechanism, the oxygen bomb clamping mechanism and the oxygen bomb cover lifting mechanism. Although the device realizes automatic sample injection of the oxygen bomb, the oxygen bomb used by the device needs to be filled with high-pressure gas, and the temperature around the outer cylinder needs to be kept constant, so that the device is not suitable for being used in complex environments such as industrial sites; and the sample injection of the crucible and the online cleaning of residual ash are not realized.
Disclosure of Invention
The invention aims to provide an open type online measurement system and a measurement method for the calorific value of pulverized coal, which avoid the complicated manual loading, unloading and replacement of oxygen bullets in an oxygen bullet calorimeter, utilize a dynamic temperature measurement calorific value mode of igniting pulverized coal and circulating working media by laser, can rapidly measure the calorific value of pulverized coal online, and improve the working efficiency and the automation level.
An open on-line measurement system for pulverized coal calorific value, comprising:
the coal powder sampling and weighing unit is used for weighing sampled coal powder;
the clamping device is used for transferring the weighed pulverized coal to the heat measuring device and transferring the burned pulverized coal to the cleaning unit;
the heat measuring device burns the coal dust transferred by the clamping device, collects temperature and flow data of the heating value of the coal dust and transmits the temperature and flow data to the data processing unit;
the data processing unit is used for receiving and processing the temperature and flow data and calculating the heating value of the pulverized coal according to the weighing quality of the pulverized coal sampling and weighing unit;
and the cleaning unit is used for cleaning residual ash after the pulverized coal is combusted.
The coal dust sampler is a sampling gun. The pulverized coal sampling and weighing unit comprises a pulverized coal sampler, a crucible and a balance.
The clamping device comprises a rotating unit and a manipulator arranged on the rotating unit, wherein the manipulator clamps the crucible after sampling to the heat metering device, and clamps the crucible after combustion to the cleaning unit. The manipulator takes the rotating unit as an axis to do circular motion, so that the crucible is transferred.
The two clamping devices are respectively positioned between the pulverized coal sampling and weighing unit and the heat measuring device and between the heat measuring device and the cleaning unit.
The cleaning unit comprises an air gun and a storage table, wherein the tail part of the air gun is provided with a gas generator for generating compressed gas to the combustion chamber or cleaning residual ash of the burnt coal dust.
The compressed gas is air or oxygen.
The heat measuring device comprises an inner cylinder, a heat preservation layer and an outer cylinder which are sequentially arranged from inside to outside, and an air inlet channel, an air outlet channel and a laser channel which are communicated with the inner cylinder after penetrating through the outer cylinder and the heat preservation layer; the first circulating working medium chamber is formed between the inner cylinder and the heat preservation layer, the second circulating working medium chamber is formed between the heat preservation layer and the outer cylinder, and the first circulating working medium chamber is communicated with the second circulating working medium chamber.
The heat measuring device for the on-line measurement of the calorific value of the pulverized coal further comprises a movable end cover. The inner cylinder is a combustion chamber, and pulverized coal is combusted in the inner cylinder, wherein the pulverized coal is contained in the crucible.
The volume of the second circulating working medium chamber is at least twice that of the first circulating working medium chamber. The purpose that sets up like this is in order to use the cycle working medium to carry out the multiple measurement of buggy calorific capacity, and cycle working medium circulates in first cycle working medium cavity and second cycle working medium cavity, avoids among the prior art fixed working medium can not carry out the test of buggy calorific capacity next time after the conduction certain heat, needs the problem that temperature control equipment cooled down.
The lower part of the heat preservation layer is provided with a circulating working medium inlet, the upper part of the heat preservation layer is provided with a circulating working medium outlet, and the first circulating working medium chamber and the second circulating working medium chamber are communicated with the circulating working medium outlet through the circulating working medium inlet.
The air inlet pipeline is arranged in a downward inclined direction from the outer cylinder to the inner cylinder. The position of the air inlet pipeline communicated with the inner cylinder is higher than the position of the crucible during combustion. The downward inclined arrangement and the opening position slightly higher than the crucible are used for ensuring that the gas is fully contacted with the coal dust after entering the combustion chamber and is discharged after supporting combustion.
The air inlet channel is connected with the gas generator.
The laser channel is positioned in the air inlet pipeline. The two channels of the air inlet channel and the laser channel are combined into a whole, so that on one hand, the structure is simplified, on the other hand, the air in the air inlet channel can cool the laser fiber head and the lens, and meanwhile, fly ash is prevented from polluting the lens.
The laser channel is internally provided with an optical fiber head and a lens, and the lens focuses laser emitted by the optical fiber head on the surface of the pulverized coal in the crucible. The optical fiber head is connected with the laser generator, the laser power emitted by the optical fiber head is adjustable, and the size and the focusing position of a laser spot focused in the crucible by the laser through the lens are adjustable.
The air outlet pipeline is spirally arranged around the inner cylinder from top to bottom. The spiral arrangement of the air outlet pipeline from top to bottom can increase the heat exchange area of the waste gas after combustion and the circulating medium, reduce the heat loss taken away by the waste gas at the outlet, and enable the heat generated by pulverized coal combustion to be transferred to the circulating medium as much as possible.
The first circulating working medium chamber and the second circulating working medium chamber are respectively provided with a temperature sensor; and a flow sensor and a temperature sensor are respectively arranged in the air inlet pipeline and the air outlet pipeline.
The temperature sensor is used for collecting the temperature of the circulating working medium or gas, and the flow sensor is used for collecting the flow of combustion-supporting gas and combustion waste gas. The temperature sensor is a platinum resistance temperature sensor, and the flow sensor is a gear flowmeter.
And a driving device is arranged in the first circulating working medium chamber or the second circulating working medium chamber, and the driving device is selected from a propeller or a water pump. The screw propeller or the water pump is used as a driving device to drive the circulation working medium to circulate, and the quick heat transfer can be realized by adjusting the flow velocity, so that the measurement time is shortened. The water pump can also be arranged outside the device or at the inlet or outlet of the circulating working medium.
In particular, the water pump may be a small vane pump.
The inner cylinder is provided with a supporting rod and a sealing chassis connected with one end of the supporting rod, and the other end of the supporting rod is connected with a motor.
The supporting rod and the sealing chassis are integrated or split. The supporting rod moves up and down under the drive of the motor, the crucible after sampling is put into the inner cylinder for burning, and the crucible after burning is transferred out of the inner cylinder. Thereby realizing the automatic injection of the pulverized coal.
And air or inert gas is filled in the heat preservation layer. The first circulating working medium chamber and the circulating working medium in the first circulating working medium chamber are water. The gas generator is used for providing clean compressed gas and providing oxygen for pulverized coal combustion. The gas generated by the gas generator is air or oxygen.
The working process of the heat measuring device is as follows:
before measurement, the movable end cover at the top of the device is opened, the sealing chassis and the supporting rod are driven by the motor to move upwards to be higher than the top of the device, the crucible containing pulverized coal is placed on the sealing chassis, the sealing chassis and the supporting rod move downwards until the sealing chassis clings to the bottom of the inner cylinder, the crucible containing pulverized coal is placed into the inner cylinder, and the movable end cover at the top is closed.
During measurement, the gas generator is used for introducing combustion-supporting gas from the gas inlet pipeline, the laser generator is used for emitting laser for a certain period of time, the laser is focused on the surface of the pulverized coal through the lens to ignite the pulverized coal, the pulverized coal is burnt in the oxygen-containing atmosphere to release heat, and combustion waste gas is discharged from the gas outlet pipeline. The heat released by the pulverized coal combustion in the combustion process is transferred to the circulating working medium in the first circulating working medium chamber through the wall surface of the inner cylinder, and the circulating working medium flows in the first circulating working medium chamber and the second circulating working medium chamber.
When pulverized coal is combusted, temperature sensors in the first circulating working medium chamber and the second circulating working medium chamber respectively collect temperatures of circulating working mediums in the two chambers, temperature sensors and flow sensors in the air inlet channel respectively collect temperatures and flow of combustion-supporting gas, and temperature sensors and flow sensors in the air outlet channel respectively collect temperatures and flow of combustion waste gas. After the collected temperature is constant, the temperature and flow data are transmitted to a computer, and correction calculation is carried out by using a computer program, so that the data of the calorific value of the coal powder can be obtained.
After the measurement, a movable end cover at the upper part of the combustion chamber is opened, and the crucible is sent out of a heat measuring device for on-line measurement of the calorific value of the pulverized coal through upward movement of a sealing chassis and a supporting rod.
The invention also provides a measuring method of the pulverized coal calorific value open type online measuring system, which comprises the following steps:
s1, weighing sampled coal dust by a coal dust sampling and weighing unit;
s2, transferring the weighed pulverized coal to a heat measuring device by a clamping device;
s3, introducing combustion-supporting gas into the heat measuring device, igniting the coal dust transferred by the clamping device by laser, collecting temperature and flow data of the heating value of the coal dust, and transmitting the temperature and flow data to the data processing unit;
s4, the data processing unit receives and processes the temperature and flow data, and calculates the calorific value of the pulverized coal;
s5, transferring the burnt coal dust to a cleaning unit by the clamping device, and cleaning residual ash after the coal dust is burnt by the cleaning unit.
In step S4, the collected temperature and flow data of the calorific value of the pulverized coal includes: the temperature of the circulating working medium in the first circulating working medium chamber and the second circulating working medium chamber, the temperature and the flow of combustion-supporting gas in the air inlet channel and the temperature and the flow of combustion waste gas in the air outlet channel.
The calculation formula of the calorific value of the pulverized coal is as follows:
wherein:
Q coal is the calorific value of coal dust of unit mass, U 1 For increasing the internal energy of the circulating working medium in the first circulating working medium chamber, U 2 For the internal energy increment of the circulating working medium in the second circulating working medium chamber, Q 1 Input energy for laser, Q 2 To take away heat when combustion-supporting gas is discharged, Q 3 T is the heat exchange quantity between the outer cylinder and the environment 0 For the temperature of the circulating working medium in the first circulating working medium chamber and the second circulating working medium chamber at the initial moment, T 1 Is the temperature T of the circulating working medium in the first circulating working medium chamber 2 Is the temperature, T, of the circulating working medium in the second circulating working medium chamber in T is the temperature of the gas in the intake passage out T is the temperature of the gas in the gas outlet channel ambient Is the ambient temperature, M is the mass of the pulverized coal, M 1 For the mass of the circulating working medium in the first circulating working medium chamber, m 2 The mass of the circulating working medium in the second circulating working medium chamber is c, the specific heat of the circulating working medium is c g Is the specific heat of gas, q g And h is the heat convection coefficient of the outer cylinder and the environment, and A is the surface area of the outer cylinder. m is m 1 And m 2 Is a fixed value, m 2 Far greater than m 1 。
Compared with the prior art, the open type online measuring system and the measuring method for the calorific value of the pulverized coal, provided by the invention, avoid the complicated manual loading and replacement of oxygen bullets in an oxygen bullet calorimeter, utilize a dynamic temperature measuring calorific value mode of igniting the pulverized coal and circulating working media by laser, quickly measure the calorific value of the pulverized coal online, realize automatic sample injection and online cleaning of the pulverized coal, and improve the working efficiency and the automation level.
Drawings
FIG. 1 is a schematic diagram of an open-type on-line measurement system for pulverized coal calorific value according to the present invention;
wherein, 11. The coal dust sampler; 12. a crucible; 13. a balance; 2. a clamping device; 31. an outer cylinder; 32. a heat preservation layer; 33. an inner cylinder; 34. an air intake passage; 35. an air outlet channel; 36. a support rod; 37. a motor; 38. a first cycle working medium chamber; 39. a second cycle working medium chamber; 4. a data processing unit; 51. an air gun; 52. and a storage table.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, which are provided for further illustration only and are not to be construed as limiting the scope of the invention.
As shown in fig. 1, the pulverized coal calorific value open type online measurement system provided by the invention comprises:
the pulverized coal sampling weighing unit comprises a pulverized coal sampler 11, a crucible 12 and a balance 13.
The two clamping devices 2 are respectively positioned between the pulverized coal sampling and weighing unit and the heat measuring device 3, and between the heat measuring device 3 and the cleaning unit; the clamping device 2 comprises a rotating unit and a manipulator arranged on the rotating unit, wherein the manipulator clamps the crucible 12 after sampling to the heat measuring device, and clamps the crucible 12 after burning to the cleaning unit.
In this embodiment, by arranging the clamping device between the weighing unit and the measuring unit and between the measuring unit and the cleaning unit, the crucible before combustion can be automatically sampled to the measuring unit, and the crucible after combustion is sent to the cleaning unit for cleaning.
A calorimeter 3 comprising: the inner cylinder 33, the heat preservation 32 and the outer cylinder 31 are sequentially arranged from inside to outside, the inner cylinder 33, the heat preservation 32 and the outer cylinder 31 are arranged in concentric circles, a first circulating working medium chamber 38 is formed between the inner cylinder 33 and the heat preservation 32, and a second circulating working medium chamber 39 is formed between the heat preservation 32 and the outer cylinder 31.
The lower part of the heat preservation layer 32 is provided with a circulating working medium inlet, the upper part of the heat preservation layer 32 is provided with a circulating working medium outlet, and the first circulating working medium chamber 38 and the second circulating working medium chamber 39 are communicated with the circulating working medium outlet through the circulating working medium inlet. The vane pump is arranged on the circulating working medium outlet, the first circulating working medium chamber 38 flows to the second circulating working medium chamber 39 through the vane pump, and the circulation of working medium in the first circulating working medium chamber 38 and the second circulating working medium chamber 39 is realized.
The first circulating working medium chamber 38 is provided with a first temperature sensor and the second circulating working medium chamber 39 is provided with a second temperature sensor. Specifically, the first temperature sensor may be provided at an outer sidewall of the inner cylinder 33, and the second temperature sensor may be provided at an inner sidewall of the outer cylinder 31.
An air inlet channel 34 which is communicated with the inner cylinder 33 and is arranged in a direction inclined downwards by 45 degrees, and a first flow sensor and a third temperature sensor are arranged in the air inlet channel 34.
The laser channel is positioned in the air inlet channel 34, and is provided with an optical fiber head and a lens, and the lens focuses laser emitted by the optical fiber head on the surface of the pulverized coal in the crucible.
And an air outlet channel 35 spirally arranged around the inner cylinder 33 from top to bottom, wherein a second flow sensor and a fourth temperature sensor are arranged in the air outlet channel 35.
The inner cylinder 33 is provided with a support rod 36 and a sealing chassis connected with one end of the support rod, and the other end of the support rod is connected with a motor 37.
And the data processing unit 4 is used for receiving and processing the temperature and flow data and calculating the heating value of the coal dust.
The cleaning unit comprises an air gun 51 and a storage table 52, and the tail part of the air gun 51 is provided with a gas generator.
Through setting up the clearance unit, the compressed gas that gas generator produced can in time clear up residual ash content, and crucible after the clearance can be through clamping device, returns the balance tray from putting thing platform, branch tray in proper order, uses again.
The method for measuring the calorific value of the pulverized coal by using the open type online measurement system comprises the following steps:
s1, feeding pulverized coal into a crucible from a pulverized coal sampler, and weighing the crucible mass before and after sampling by a balance to obtain the mass of pulverized coal in the crucible;
s2, driving the supporting rod to rise upwards to be level with the balance by the motor;
s3, transferring the crucible from the balance to the supporting rod by the clamping device;
s4, the motor drives the supporting rod to descend, and the crucible is sent into the inner barrel;
s5, air or oxygen enters the inner cylinder through the air inlet channel, laser ignites pulverized coal through the laser channel, after the pulverized coal is combusted, waste gas is discharged out of the measuring device through the air outlet channel, and the temperature sensor and the flow sensor collect the temperature and the flow of combustion-supporting gas in the air inlet channel; collecting the temperature and flow of the inlet gas and the outlet gas, and transmitting the temperature and the flow to a data processing unit in real time;
s6, transferring heat to the circulating working medium of the first circulating working medium chamber and the second circulating working medium chamber and combustion waste gas through the inner cylinder when the pulverized coal is combusted; the temperature sensor collects the temperature of the circulating working medium in the first circulating working medium chamber and the second circulating working medium chamber, and the temperature sensor and the flow sensor collect the temperature and the flow of the combustion waste gas in the air outlet channel; the collected temperature and flow data are transmitted to the data processing unit in real time;
s7, after the coal powder is burnt out, the motor drives the supporting rod to rise upwards to the outside of the measuring device;
s8, transferring the crucible from the support rod to a storage table and below the air gun by using a clamping device;
s9, jetting compressed gas by the air gun generator to clean residual ash after pulverized coal combustion in the crucible.
And S10, the data processing unit calculates the calorific value of the pulverized coal through the temperature and the flow of the combustion-supporting gas acquired in the step S5, the temperature of the circulating working medium acquired in the step S6 and the temperature and the flow of the combustion waste gas acquired in the step S6.
In the embodiment, the air inlet channel is adopted to introduce oxygen or air, and the laser channel is adopted at the same time, so that the pulverized coal is ignited by laser, the strict condition to the environment when the oxygen bomb is used is avoided, and the oxygen bomb is not required to be replaced, so that the method is simpler; and adopt clamping device and clearance unit, realized the autoloading and the reuse of crucible, avoided using manual sampling lofting, make it can realize on-line measurement and improved efficiency and automation level.
The present invention has been described in detail with reference to the examples, but the implementation of the present invention is not limited to the examples, and any other changes, substitutions, combinations, and simplifications made under the teaching of the present invention are included in the protection scope of the present invention.
Claims (7)
1. An open on-line measurement system for pulverized coal calorific value, comprising:
the coal powder sampling and weighing unit is used for weighing sampled coal powder;
the clamping device is used for transferring the weighed pulverized coal to the heat measuring device and transferring the burned pulverized coal to the cleaning unit;
the heat measuring device burns the coal dust transferred by the clamping device, collects temperature and flow data of the heating value of the coal dust and transmits the temperature and flow data to the data processing unit;
the data processing unit is used for receiving and processing the temperature and flow data and calculating the heating value of the pulverized coal according to the weighing quality of the pulverized coal sampling and weighing unit;
the cleaning unit is used for cleaning residual ash after pulverized coal combustion;
the heat measuring device comprises an inner cylinder, a heat preservation layer and an outer cylinder which are sequentially arranged from inside to outside, and an air inlet channel, an air outlet channel and a laser channel which are communicated with the inner cylinder after penetrating through the outer cylinder and the heat preservation layer; a first circulating working medium chamber is formed between the inner cylinder and the heat preservation layer, a second circulating working medium chamber is formed between the heat preservation layer and the outer cylinder, and the first circulating working medium chamber is communicated with the second circulating working medium chamber;
the first circulating working medium chamber and the second circulating working medium chamber are respectively provided with a temperature sensor; the air inlet channel and the air outlet channel are respectively provided with a flow sensor and a temperature sensor;
the pulverized coal sampling and weighing unit comprises a pulverized coal sampler, a crucible and a balance; the clamping device comprises a rotating unit and a manipulator arranged on the rotating unit; the manipulator clamps the sampled crucible to the heat measuring device and clamps the burned crucible to the cleaning unit.
2. The system of claim 1, wherein the two clamping devices are respectively located between the pulverized coal sampling weighing unit and the heat measuring device and between the heat measuring device and the cleaning unit.
3. The system of claim 1, wherein the cleaning unit comprises an air gun and a storage table, and a gas generator is arranged at the tail of the air gun for generating compressed gas to clean residual ash of the burnt coal dust.
4. The system of claim 1, wherein a driving device is disposed in the first cycle working medium chamber or the second cycle working medium chamber, and the driving device is selected from a propeller or a water pump.
5. The system of claim 1, wherein the inner cylinder is provided with a lifting device, and comprises a supporting rod and a sealing chassis connected with one end of the supporting rod, and the other end of the supporting rod is connected with the motor.
6. A measurement method using the pulverized coal calorific value open type online measurement system according to any one of claims 1 to 5, comprising the steps of:
s1, weighing sampled coal dust by a coal dust sampling and weighing unit;
s2, transferring the weighed pulverized coal to a heat measuring device by a clamping device;
s3, introducing combustion-supporting gas into the heat measuring device, igniting the coal dust transferred by the clamping device by laser, collecting temperature and flow data of the heating value of the coal dust, and transmitting the temperature and flow data to the data processing unit;
s4, the data processing unit receives and processes the temperature and flow data, and calculates the calorific value of the pulverized coal;
s5, transferring the burnt coal dust to a cleaning unit by the clamping device, and cleaning residual ash after the coal dust is burnt by the cleaning unit.
7. The measurement method according to claim 6, wherein in step S4, the collected temperature and flow data of the calorific value of the pulverized coal includes: the temperature of the circulating working medium in the first circulating working medium chamber and the second circulating working medium chamber, the temperature and the flow of combustion-supporting gas in the air inlet channel and the temperature and the flow of combustion waste gas in the air outlet channel.
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| CN109813783A (en) * | 2019-03-28 | 2019-05-28 | 山东省产品质量检验研究院 | A kind of detection method improving wire and cable fluorine content measurement precision |
| CN110186744B (en) * | 2019-04-12 | 2020-09-15 | 武汉钢铁有限公司 | Sintered solid fuel calorific value online rapid detection method and processing device |
| CN110631948A (en) * | 2019-09-30 | 2019-12-31 | 佛山科学技术学院 | Raw coal ash content detection device and detection method |
| CN113189140B (en) * | 2021-04-21 | 2022-06-14 | 武汉深维鼎测科技有限公司 | Heating value detection method and automatic detection system based on wall temperature monitoring oxygen bomb device |
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| CN209513692U (en) * | 2018-11-08 | 2019-10-18 | 浙江大学 | A kind of open on-line measurement system of coal dust calorific value |
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| US7252802B2 (en) * | 2000-02-18 | 2007-08-07 | John Anthony Bonnard | Apparatus and method for igniting sample in calorimeters |
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| US4869597A (en) * | 1988-06-13 | 1989-09-26 | Christopher Daniel E | Calorimeter |
| CN1821758A (en) * | 2006-03-29 | 2006-08-23 | 朱先德 | Peripheral temperature control calorimeter |
| CN102004119A (en) * | 2010-11-04 | 2011-04-06 | 西北工业大学 | Method for measuring combustion heat value of boron powder |
| CN106290463A (en) * | 2016-07-22 | 2017-01-04 | 中国石油化工股份有限公司 | The device of adiabatic calorimetry measurement is carried out under High Temperature High Pressure |
| CN209513692U (en) * | 2018-11-08 | 2019-10-18 | 浙江大学 | A kind of open on-line measurement system of coal dust calorific value |
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