CN113155217A - Method and system for measuring solid circulation flow rate of thermal state circulating fluidized bed - Google Patents
Method and system for measuring solid circulation flow rate of thermal state circulating fluidized bed Download PDFInfo
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- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/86—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure
- G01F1/88—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure with differential-pressure measurement to determine the volume flow
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Abstract
The application provides a method and a system for measuring the solid circulation flow rate of a thermal state circulating fluidized bed. The measuring method comprises the following steps: acquiring a target pressure difference between a first pressure measuring point and a second pressure measuring point; the first pressure measuring point and the second pressure measuring point are arranged in a riser or a hearth dilute phase region of the circulating fluidized bed, and the distance between the first pressure measuring point and the second pressure measuring point is delta h; determining a pre-established fitted curve of the differential pressure and the solid circulation flow rate; and predicting the solid circulation flow rate corresponding to the target pressure difference based on the fitted curve of the pressure difference and the solid circulation flow rate. The solid circulation flow rate measuring device can reliably measure the solid circulation flow rate of the thermal state circulating fluidized bed, is simple in measuring facility, does not need to additionally increase a material measuring section, is low in cost, directly utilizes the pressure difference to represent the solid circulation flow rate, and does not interfere with the normal running state of the circulating fluidized bed.
Description
Technical Field
The application relates to the technical field of circulating fluidized beds, in particular to a method and a system for measuring the solid circulating flow rate of a thermal circulating fluidized bed.
Background
The circulating fluidized bed is a high-efficiency heat and mass transfer reaction device and is widely applied to industries such as energy, electric power, chemical engineering, metallurgy and the like. And the circulating fluidized bed combustion technology has the advantages of wide coal type adaptability, strong load regulation capability, low pollutant discharge and the like, and is internationally recognized as one of clean coal combustion technologies with the best commercialization degree.
The solid circulation flow rate is an important technical parameter of the circulating fluidized bed, the size of the solid circulation flow rate is an important index for judging the gas-solid flow state in the lifting pipe or the hearth, the gas-solid flow in the lifting pipe or the hearth can reach a fast fluidized state only when the circulation flow rate reaches the saturated carrying rate, and the proper solid circulation flow rate has important significance for the operation, heat transfer and combustion of the circulating fluidized bed.
In the related art, conventional solid circulation flow rate measuring methods include a butterfly valve measuring method, a bed tracing method, an impulse flow meter method, an optical acoustic sensor method, and the like. However, the current solid circulation flow rate measurement method is limited to a cold circulating fluidized bed system and cannot adapt to the high-temperature environment of a hot circulating fluidized bed reactor and a circulating fluidized bed boiler.
Disclosure of Invention
The present application is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the first objective of the present application is to provide a method for measuring the solid circulation flow rate of a hot circulating fluidized bed, which can reliably measure the solid circulation flow rate of the hot circulating fluidized bed, has simple measurement facilities, does not need to additionally add a material measurement section, is low in cost, and directly uses the pressure difference to characterize the solid circulation flow rate, and does not interfere with the normal operation state of the circulating fluidized bed.
The second purpose of this application is to propose a measurement system of the solid circulation flow rate of the hot circulating fluidized bed.
In order to achieve the above object, an embodiment of the first aspect of the present application provides a method for measuring a solid circulation flow rate of a hot circulating fluidized bed, including:
acquiring a target pressure difference between a first pressure measuring point and a second pressure measuring point; the first pressure measuring point and the second pressure measuring point are arranged in a riser or a hearth dilute-phase region of the circulating fluidized bed, and the distance between the first pressure measuring point and the second pressure measuring point is delta h;
determining a pre-established fitted curve of the differential pressure and the solid circulation flow rate;
predicting the solids circulation flow rate corresponding to the target pressure differential based on the fitted curve of the pressure differential to the solids circulation flow rate.
In some embodiments of the present application, the fitted curve of the pressure differential to the solids circulation flow rate is pre-established by:
determination of bulk Density rho of circulating materials in a laboratoryb；
Setting a first pressure measuring point and a second pressure measuring point with a distance delta h in a riser pipe or a hearth dilute phase region of the circulating fluidized bed, and obtaining a pressure difference delta P between the first pressure measuring point and the second pressure measuring point;
arranging a first thermocouple and a second thermocouple which are arranged at a distance H at a position close to a vertical pipe of a return valve, and detecting the temperature change of the first thermocouple and the second thermocouple;
in the stable operation process, the return air of the return valve is suddenly closed, and the time interval delta tau of the sudden temperature change of the first thermocouple and the second thermocouple in the time of closing the return air is recorded;
according to the bulk density ρbAnd the time interval delta tau of the temperature shock of the first thermocouple and the second thermocouple, and calculating the solid circulation flow rate G by adopting a preset formulas；
Using said pressure difference Δ P and said solids circulation flow rate GsFitting said differential pressure Δ P to said solids circulation flow rate G as a single-valued functionsTo obtain a fitted curve of the differential pressure and the solid circulation flow rate.
In the embodiment of the present application, the preset formula is expressed as follows:
wherein G issIs the solids circulation flow rate, pbDelta tau is the time interval of the temperature shock of the first thermocouple and the second thermocouple in the time of closing the return air, H is the position interval of the first thermocouple and the second thermocouple, AsIs the cross-sectional area of the riser.
In order to achieve the above object, a second embodiment of the present application provides a system for measuring a solid circulation flow rate of a hot circulating fluidized bed, comprising:
the data processing module is used for acquiring target pressure difference of the first pressure measuring point and the second pressure measuring point, determining a pre-established fitting curve of the pressure difference and the solid circulation flow rate, and predicting the solid circulation flow rate corresponding to the target pressure difference based on the fitting curve of the pressure difference and the solid circulation flow rate; the first pressure measuring point and the second pressure measuring point are arranged in a riser or a hearth dilute-phase region of the circulating fluidized bed, and the distance between the first pressure measuring point and the second pressure measuring point is delta h.
In some embodiments of the present application, the measurement system further comprises:
the first pressure guide device is obliquely arranged on the outer side of the lifting pipe or the hearth, and the joint of the first pressure guide device and the lifting pipe or the hearth is a first pressure measuring point;
the second pressure guide device is obliquely arranged on the outer side of the lifting pipe or the hearth, and the joint of the second pressure guide device and the lifting pipe or the hearth is a second pressure measuring point;
the pressure difference acquisition device is respectively connected with the first pressure leading device and the second pressure leading device and is used for measuring the pressure difference between the first pressure measuring point and the second pressure measuring point;
the first thermocouple and the second thermocouple are respectively arranged at a position close to a vertical pipe of the return valve, and the distance between the first thermocouple and the second thermocouple is H;
and the temperature acquisition device is respectively connected with the first thermocouple and the second thermocouple and is used for recording the time interval delta tau of the temperature shock of the first thermocouple and the second thermocouple in the time of closing the return air.
In the examples of the present application, the fitted curve of the differential pressure to the solids circulation flow rate was previously established by:
determination of bulk Density rho of circulating materials in a laboratoryb；
Setting a first pressure measuring point and a second pressure measuring point with a distance delta h in a riser pipe or a hearth dilute phase region of the circulating fluidized bed, and obtaining a pressure difference delta P between the first pressure measuring point and the second pressure measuring point;
arranging a first thermocouple and a second thermocouple which are arranged at a distance H at a position close to a vertical pipe of a return valve, and detecting the temperature change of the first thermocouple and the second thermocouple;
in the stable operation process, the return air of the return valve is suddenly closed, and the time interval delta tau of the sudden temperature change of the first thermocouple and the second thermocouple in the time of closing the return air is recorded;
according to the bulk density ρbAnd the time interval delta tau of the temperature shock of the first thermocouple and the second thermocouple, and calculating the solid circulation flow rate G by adopting a preset formulas；
Using said pressure difference Δ P and said solids circulation flow rate GsFitting said differential pressure Δ P to said solids circulation flow rate G as a single-valued functionsTo obtain a fitted curve of the differential pressure and the solid circulation flow rate.
In the embodiment of the present application, the preset formula is expressed as follows:
wherein G issIs the solids circulation flow rate, pbDelta tau is the time interval of the temperature shock of the first thermocouple and the second thermocouple in the time of closing the return air, H is the position interval of the first thermocouple and the second thermocouple, AsIs the cross-sectional area of the riser.
In the embodiment of the present application, the angles between the first pressure guiding device and the riser or the hearth and between the second pressure guiding device and the riser or the hearth are both 30 degrees.
In some embodiments of the present application, the measurement system further comprises:
and the reverse blowing device is respectively connected with the first pressure guide device and the second pressure guide device and is used for blowing the materials in the first pressure guide device and the second pressure guide device back to the lifting pipe or the hearth.
In the embodiment of the application, the reverse blowing device is respectively connected with one end of the outlet of the first pressure guide device and one end of the outlet of the second pressure guide device; the pressure difference acquisition device is respectively connected with the other end of the outlet of the first pressure guide device and the other end of the outlet of the second pressure guide device.
According to the technical scheme of the embodiment of the application, the solid circulation flow rate of the thermal state circulating fluidized bed can be reliably measured; the measuring facility is simple, no material measuring section is required to be additionally arranged, and the cost is low; the solid circulation flow rate is directly represented by using the pressure difference, and the normal operation state of the circulating fluidized bed is not interfered; the method can be used for thermal state circulating fluidized bed reactors or combustion devices in the fields of energy, electric power, chemical industry, metallurgy and the like, and can also be used for basic research of thermal state circulating fluidized beds.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural diagram of a system for circulating a solids flow rate of a hot circulating fluidized bed according to an embodiment of the present disclosure;
FIG. 2 is a schematic flow chart of a method for measuring the solid circulation flow rate of a hot circulating fluidized bed according to an embodiment of the present disclosure;
FIG. 3 is an exemplary graph of a fitted curve of pressure differential versus solids circulation flow rate established in an embodiment of the present application;
FIG. 4 is a schematic diagram illustrating a variation of temperature shock of the first thermocouple and the second thermocouple according to an embodiment of the present application;
FIG. 5 is an exemplary graph of a fitted curve of differential pressure versus solids circulation flow rate for an embodiment of the present application.
Reference numerals
1: a fluidized bed dense phase zone; 2: a riser or furnace; 3: a fluidized bed dilute phase zone; 4: a first pressure measurement point; 5: a second pressure measurement point; 9: a cyclone separator; 10: a riser; 11: a first pressure-inducing device; 12: a second pressure-inducing device; 13: a differential pressure acquisition device; 14: a back blowing device; 21: a first thermocouple; 22: a second thermocouple; 23: a temperature acquisition device; 130: a material return valve; 140: and a material returning air inlet.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
In the related art, conventional solid circulation flow rate measuring methods include a butterfly valve measuring method, a bed tracing method, an impulse flow meter method, an optical acoustic sensor method, and the like. The butterfly valve measurement method is realized as follows: and after the circulating fluidized bed stably operates for a period of time, suddenly closing a vertical pipe at the lower part of the cyclone separator, measuring the height of the material accumulated on the closing valve in a limited short time, or leading out and weighing the accumulated material to obtain the mass of the accumulated material, and dividing the mass of the accumulated material by the measuring time to obtain the solid circulating flow rate. The disadvantage of this method is that the measurement is only suitable for cold test, and the valve setting and material discharging are difficult in hot test.
The implementation of the companion bed method is as follows: the lower part of the cyclone separator is provided with a trace bed with a certain height as a measuring section. The upper part of the accompanying bed is provided with a flap valve, and the bottom of the accompanying bed is provided with a valve. The materials can be guided into the accompanying bed by switching the flap valve. The wall surface of the measurement section of the accompanying bed is provided with a scale, the visual section is additionally arranged for observation, and the solid circulation flow rate is calculated according to the height of material accumulation and the measurement time. The mode needs independently to increase the material measurement section, and the structure is complicated, increases transformation cost and space, and flap valve and butterfly valve work difficulty under the hot attitude moreover, so just be limited to the cold test equally.
The impact flow meter method is implemented as follows: the pressure sensor is placed in the lower feed back riser of the cyclone separator, and the circulating flow rate is back-inferred by measuring the force. The pressure sensor used in the method can cause certain influence on the local flow field, the accuracy is influenced by the installation position of the sensor and the nonuniformity of the flow field in the pipe, the installation and calibration are difficult in a thermal state, and the long-term operation is difficult.
The optical acoustic sensor method is implemented as follows: the circulation flow rate is measured indirectly by means of sensors for optical or acoustic properties in the fluidized bed. The method has higher requirements on the sensor, and no sensor which can be directly applied to a high-temperature environment exists at present.
In summary, the current solid circulation flow rate measurement method is limited to the cold circulating fluidized bed system and cannot adapt to the high temperature environment of the hot circulating fluidized bed reactor and the circulating fluidized bed boiler. Therefore, the application provides a method and a system for measuring the solid circulation flow rate of the thermal state circulating fluidized bed, which can be used for thermal state circulating fluidized bed reactors or combustion devices in the fields of energy, electricity, chemical industry and metallurgy, and can also be used for basic research of the thermal state circulating fluidized bed.
The following describes a method and a system for measuring a solid circulation flow rate of a hot circulating fluidized bed according to an embodiment of the present application with reference to the drawings.
It should be noted that the method for measuring the solid circulation flow rate of the hot circulating fluidized bed according to the embodiment of the present application can be applied to the system for measuring the solid circulation flow rate of the hot circulating fluidized bed according to the embodiment of the present application. Wherein, the system for measuring the solid circulation flow rate of the hot circulating fluidized bed can comprise: and a data processing module. The data processing module can be used for acquiring target pressure differences of the first pressure measuring point and the second pressure measuring point, determining a pre-established fitting curve of the pressure differences and the solid circulation flow rate, and predicting the solid circulation flow rate corresponding to the target pressure differences on the basis of the fitting curve of the pressure differences and the solid circulation flow rate; the first pressure measuring point and the second pressure measuring point are arranged in a riser or a hearth dilute phase region of the circulating fluidized bed, and the distance between the first pressure measuring point and the second pressure measuring point is delta h.
As an example, as shown in fig. 1, the system for measuring the solid circulation flow rate of the hot circulating fluidized bed may further include: the device comprises a first pressure guide device 11, a second pressure guide device 12, a pressure difference acquisition device 13, a first thermocouple 21, a second thermocouple 22 and a temperature acquisition device 23. The first pressure guide device 11 is obliquely arranged on the outer side of the riser (or the hearth) 2, and the joint of the first pressure guide device 11 and the riser (or the hearth) 2 is a first pressure measuring point 4. The second pressure guide device 12 is obliquely arranged on the outer side of the lifting pipe (or the hearth) 2, and the joint of the second pressure guide device 12 and the lifting pipe (or the hearth) 2 is a second pressure measuring point 5. The pressure difference acquisition device 13 is respectively connected with the first pressure leading device 11 and the second pressure leading device 12 and is used for measuring the pressure difference of the first pressure measuring point 4 and the second pressure measuring point 5. The first thermocouple 21 and the second thermocouple 22 are respectively arranged at the position of the riser 10 close to the return valve 130, and the distance between the first thermocouple 21 and the second thermocouple 22 is H. The temperature acquisition device 23 is connected with the first thermocouple 21 and the second thermocouple 22 respectively and is used for recording the time interval delta tau of the temperature shock of the first thermocouple 21 and the second thermocouple 22 in the time of closing the return air.
In order to avoid the blockage of the pressure guiding devices, the piezoelectric collecting devices and other devices caused by the material particles in the riser or the hearth entering the pressure guiding devices, optionally, the first pressure guiding device 11 and the second pressure guiding device 12 may be obliquely installed outside the riser or the hearth, and in some embodiments of the present application, the angles of the first pressure guiding device 11 and the second pressure guiding device 12 to the riser or the hearth are both 30 degrees.
In order to further avoid the blockage of devices such as a pressure guiding device and a piezoelectric collecting device caused by the fact that material particles in a lifting pipe or a hearth enter the pressure guiding device. Optionally, in some embodiments of the present application, the measurement system of the embodiments of the present application may further include: a blowback device 14. Wherein, the back-blowing device 14 is respectively connected with the first pressure-inducing device 11 and the second pressure-inducing device 12, and the back-blowing device 14 is used for blowing the materials in the first pressure-inducing device 11 and the second pressure-inducing device 12 back to the lifting pipe (or the hearth) 2.
As an example, the back blowing device 14 is respectively connected with one end of the outlet of the first pressure guide device 11 and one end of the outlet of the second pressure guide device 12; the pressure difference collecting device 13 is respectively connected with the other end of the outlet of the first pressure guide device 11 and the other end of the outlet of the second pressure guide device 12.
The application can realize the measurement of the solid circulation flow rate of the hot circulating fluidized bed based on the measurement system shown in figure 1. As shown in FIG. 2, the method for measuring the solid circulation flow rate of the hot circulating fluidized bed may include the following steps.
In step 201, a target differential pressure is obtained for a first pressure measurement point and a second pressure measurement point.
In the embodiment of the application, the first pressure measuring point and the second pressure measuring point are arranged in a riser or a hearth dilute-phase region of the circulating fluidized bed, and the distance between the first pressure measuring point and the second pressure measuring point is delta h.
In step 202, a pre-established fit curve of differential pressure to solids circulation flow rate is determined.
In some embodiments of the present application, as shown in fig. 3, a fitted curve of differential pressure versus solids circulation flow rate may be pre-established by:
301, measuring the bulk density rho of the circulating material in a laboratoryb；
304, in the stable operation process, suddenly closing the return air of the return valve, and recording the time interval delta tau of the sudden temperature change of the first thermocouple and the second thermocouple in the time of closing the return air;
305, according to the bulk density rhobAnd the time interval delta tau of the temperature shock of the first thermocouple and the second thermocouple, and calculating the solid circulation flow rate G by adopting a preset formulas；
As an example, the preset formula is expressed as follows:
wherein G issIs the solids circulation flow rate, pbFor bulk density, Δ τ is the time interval during which the temperatures of the first thermocouple and the second thermocouple suddenly change during the time period in which the return air is turned off, H is the position interval between the first thermocouple and the second thermocouple, asIs the cross-sectional area of the riser.
Therefore, through the steps 301-306, a fitted curve of the pressure difference and the solid circulation flow rate can be established in advance, so that in actual operation, the measurement of the solid circulation flow rate can be realized by using the fitted curve of the pressure difference and the solid circulation flow rate without stopping the return air.
In step 203, a solids circulation flow rate corresponding to the target pressure difference is predicted based on the fitted curve of the pressure difference and the solids circulation flow rate.
That is, in the embodiment of the present application, two pressure measurement points 4 and 5 with a distance Δ h are disposed in the dilute phase zone 3 of the riser (or the furnace) 2, and the pressure difference value Δ P between the two pressure measurement points 4 and 5 is recorded by the pressure difference collecting device 13; two thermocouples 21 and 22 with the distance H are arranged at the position of the vertical pipe 10 close to the material returning valve 130, and the temperature change of the two thermocouples 21 and 22 is recorded by using a temperature acquisition device 23; in the process of stable operation, the return air Q at the return air inlet 140 is suddenly closed, the riser (or the furnace) 2 stably operates within a short time of closing, at this time, the material is accumulated in the riser 10, the temperatures measured by the thermocouples 21 and 22 are sequentially and immediately changed along with the continuous increase of the stacking height in the riser 10, and the time interval Δ τ of the temperature sudden change of the thermocouples 21 and 22 on the riser 10 is obtained by using the temperature acquisition device 23, and the change schematic diagram is shown in fig. 4.
Calculating the solid circulation flow rate G by the above-mentioned preset formulas. Because in actual operation, G cannot be controlled by using the mode of sudden stop of return airsThe measurement is carried out taking into account the particle concentration epsilon of the riser or the freeboard zonesAnd GsThe following relationships exist:
according to epsilon in the riser in the steady flow experimentsRelationship to Δ P:
can obtain
Wherein, the delta P is the pressure difference between two pressure measuring points; rhosIs the particle density; delta h is the distance between pressure measuring points; epsilonsIs the particle concentration; u. ofgIs the gas velocity; u. oftFor settling velocity of particle terminalsDegree;
is the slip coefficient; g is the acceleration of gravity.
It will be appreciated that Δ P itself is defined by GsResulting in the production of Δ P and G as also illustrated by the above formulasIs a single-valued function, therefore G can be characterized by Δ Ps. G obtained by calculationsPlots and fits curves with the corresponding Δ P as shown in fig. 5. From the fitted curve, G is accurately characterized by Δ Ps. Therefore, in actual operation, the normal operation state of the circulating fluidized bed is not required to be disturbed, and the solid circulating flow rate can be measured by only utilizing the target pressure difference of the first pressure measuring point and the second pressure measuring point and the fitting curve of the pressure difference and the solid circulating flow rate.
In summary, the solid circulation flow rate measurement of the hot circulating fluidized bed can be reliably realized; the measuring facility is simple, no material measuring section is required to be additionally arranged, and the cost is low; the solid circulation flow rate is directly represented by using the pressure difference, and the normal operation state of the circulating fluidized bed is not interfered; the method can be used for thermal state circulating fluidized bed reactors or combustion devices in the fields of energy, electric power, chemical industry, metallurgy and the like, and can also be used for basic research of thermal state circulating fluidized beds.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (10)
1. A method for measuring the solid circulation flow rate of a hot circulating fluidized bed is characterized by comprising the following steps:
acquiring a target pressure difference between a first pressure measuring point and a second pressure measuring point; the first pressure measuring point and the second pressure measuring point are arranged in a riser or a hearth dilute-phase region of the circulating fluidized bed, and the distance between the first pressure measuring point and the second pressure measuring point is delta h;
determining a pre-established fitted curve of the differential pressure and the solid circulation flow rate;
and predicting the solid circulation flow rate corresponding to the target pressure difference based on the fitted curve of the pressure difference and the solid circulation flow rate.
2. The method according to claim 1, wherein the fitted curve of the pressure difference to the solids circulation flow rate is pre-established by:
determination of bulk Density rho of circulating materials in a laboratoryb；
Setting a first pressure measuring point and a second pressure measuring point with a distance delta h in a riser pipe or a hearth dilute phase region of the circulating fluidized bed, and obtaining a pressure difference delta P between the first pressure measuring point and the second pressure measuring point;
arranging a first thermocouple and a second thermocouple which are arranged at a distance H at a position close to a vertical pipe of a return valve, and detecting the temperature change of the first thermocouple and the second thermocouple;
in the stable operation process, the return air of the return valve is suddenly closed, and the time interval delta tau of the sudden temperature change of the first thermocouple and the second thermocouple in the time of closing the return air is recorded;
according to the bulk density ρbAnd the time interval delta tau of the temperature shock of the first thermocouple and the second thermocouple, and calculating the solid circulation flow rate G by adopting a preset formulas；
Using said pressure difference Δ P andthe solids circulation flow rate GsFitting said differential pressure Δ P to said solids circulation flow rate G as a single-valued functionsTo obtain a fitted curve of the differential pressure and the solid circulation flow rate.
3. The method of claim 2, wherein the predetermined formula is expressed as follows:
wherein G issIs the solids circulation flow rate, pbDelta tau is the time interval of the temperature shock of the first thermocouple and the second thermocouple in the time of closing the return air, H is the position interval of the first thermocouple and the second thermocouple, AsIs the cross-sectional area of the riser.
4. A system for measuring the solid circulation flow rate of a hot circulating fluidized bed, comprising:
the data processing module is used for acquiring target pressure difference of the first pressure measuring point and the second pressure measuring point, determining a pre-established fitting curve of the pressure difference and the solid circulation flow rate, and predicting the solid circulation flow rate corresponding to the target pressure difference based on the fitting curve of the pressure difference and the solid circulation flow rate; the first pressure measuring point and the second pressure measuring point are arranged in a riser or a hearth dilute-phase region of the circulating fluidized bed, and the distance between the first pressure measuring point and the second pressure measuring point is delta h.
5. The system of claim 4, further comprising:
the first pressure guide device is obliquely arranged on the outer side of the lifting pipe or the hearth, and the joint of the first pressure guide device and the lifting pipe or the hearth is a first pressure measuring point;
the second pressure guide device is obliquely arranged on the outer side of the lifting pipe or the hearth, and the joint of the second pressure guide device and the lifting pipe or the hearth is a second pressure measuring point;
the pressure difference acquisition device is respectively connected with the first pressure leading device and the second pressure leading device and is used for measuring the pressure difference between the first pressure measuring point and the second pressure measuring point;
the first thermocouple and the second thermocouple are respectively arranged at a position close to a vertical pipe of the return valve, and the distance between the first thermocouple and the second thermocouple is H;
and the temperature acquisition device is respectively connected with the first thermocouple and the second thermocouple and is used for recording the time interval delta tau of the temperature shock of the first thermocouple and the second thermocouple in the time of closing the return air.
6. The system of claim 4 or 5, wherein the fitted curve of the differential pressure to the solids circulation flow rate is pre-established by:
determination of bulk Density rho of circulating materials in a laboratoryb；
Setting a first pressure measuring point and a second pressure measuring point with a distance delta h in a riser pipe or a hearth dilute phase region of the circulating fluidized bed, and obtaining a pressure difference delta P between the first pressure measuring point and the second pressure measuring point;
arranging a first thermocouple and a second thermocouple which are arranged at a distance H at a position close to a vertical pipe of a return valve, and detecting the temperature change of the first thermocouple and the second thermocouple;
in the stable operation process, the return air of the return valve is suddenly closed, and the time interval delta tau of the sudden temperature change of the first thermocouple and the second thermocouple in the time of closing the return air is recorded;
according to the bulk density ρbAnd the time interval delta tau of the temperature shock of the first thermocouple and the second thermocouple, and calculating the solid circulation flow rate G by adopting a preset formulas；
Using said pressure difference Δ P with said solid recycle streamRate GsFitting said differential pressure Δ P to said solids circulation flow rate G as a single-valued functionsTo obtain a fitted curve of the differential pressure and the solid circulation flow rate.
7. The system of claim 6, wherein the predetermined formula is expressed as follows:
wherein G issIs the solids circulation flow rate, pbDelta tau is the time interval of the temperature shock of the first thermocouple and the second thermocouple in the time of closing the return air, H is the position interval of the first thermocouple and the second thermocouple, AsIs the cross-sectional area of the riser.
8. The system of claim 5, wherein the first pressure inducing device and the second pressure inducing device are both at an angle of 30 degrees to the riser or the furnace, respectively.
9. The system of claim 5, further comprising:
and the reverse blowing device is respectively connected with the first pressure guide device and the second pressure guide device and is used for blowing the materials in the first pressure guide device and the second pressure guide device back to the lifting pipe or the hearth.
10. The system as claimed in claim 9, wherein said blowback means is connected to one end of the outlet of said first pressure inducing means and one end of the outlet of said second pressure inducing means, respectively; the pressure difference acquisition device is respectively connected with the other end of the outlet of the first pressure guide device and the other end of the outlet of the second pressure guide device.
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