A modeling method for pressure and flow of a mother-pipe circulating fluidized bed unit thermal system

Abstract

The present application relates to the technical field of device simulation, in particular to a kind of mother pipe circulating fluidized bed unit thermal system pressure flow modeling method, specifically as follows: mold development, in steam flow network, each mold is written algorithm, to realize the calculation of pressure, temperature, flow in flow network;System building, relevant mold is connected according to the system diagram provided by power plant, use steam medium module, the superheater system of three fluidized bed boilers and the mother pipe connected, connect two steam turbines and steam extraction system after main steam mother pipe etc.The modeling method for solving the pressure flow of the mother pipe circulating fluidized bed unit thermal system can be used for full range full process 1:1 mother pipe circulating fluidized bed unit simulation training system, can reflect the characteristics of the whole mother pipe unit, can realize the whole process simulation of mother pipe circulating fluidized bed unit, accurately simulate the dynamic and static characteristics and trend under various operating conditions of unit.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of equipment simulation, in particular to a modeling method for pressure flow of a mother-pipe circulating fluidized bed unit thermal system. BACKGROUND

[0002] As a high-efficiency clean combustion technology of coal, the circulating fluidized bed shows vigorous vitality due to its advantages of wide fuel adaptability, high combustion efficiency, good load regulation, low SOX and NOX emissions, etc. With the gradual increase of the capacity and automation degree of the circulating fluidized bed unit, the training requirement for the operation shift personnel is more urgent. The fluidized bed unit simulation training system can realize the whole process simulation of the circulating fluidized bed unit, accurately simulate the dynamic and static characteristics and trends under various operating conditions of the unit, and can perform unit start-up, shutdown, operation, various tests, fault handling, anti-accident drills, control system configuration analysis and parameter optimization setting, so that the control operation personnel can master the unit start-up and shutdown and accident handling operation skills, promote the training of all-round shift personnel, and provide a simulation analysis test platform for maintenance personnel.

[0003] At present, the existing fluidized bed unit simulation training systems developed in the domestic existing technology are mostly simulated unit units, which cannot accurately reflect the characteristics of the mother-pipe circulating fluidized bed unit. The modeling method for the thermal system of the unit circulating fluidized bed unit is to respectively establish a set of fluidized bed boiler and a set of steam turbine model. This model can only reflect the characteristics of the unit unit, and cannot truly reflect the characteristics of the mother-pipe unit. Moreover, even if there is a simulation of the mother-pipe circulating fluidized bed unit in the existing technology, only one circulating fluidized bed boiler or one steam turbine is simulated, and the other circulating fluidized bed boiler or steam turbine is only regarded as a boundary point. This way cannot reflect the overall characteristics of the mother-pipe unit. SUMMARY

[0004] The main purpose of the present application is to overcome the problem that the unit circulating fluidized bed unit in the prior art cannot accurately reflect the characteristics of the mother-pipe circulating fluidized bed unit, and to provide a modeling method for pressure flow of a mother-pipe circulating fluidized bed unit thermal system. The modeling method can be used for a 1:1 mother-pipe circulating fluidized bed unit simulation training system in the full range and full process, can reflect the overall characteristics of the mother-pipe unit, and can realize the whole process simulation of the mother-pipe circulating fluidized bed unit and accurately simulate the dynamic and static characteristics and trends under various operating conditions of the unit.

[0005] The technical scheme adopted by the present application to achieve the technical purpose is as follows: a modeling method for pressure flow of a mother-pipe circulating fluidized bed unit thermal system, specifically as follows:

[0006] S1, mold development, in the steam flow net, each mold is written with algorithm, in order to realize the calculation of pressure, temperature and flow in the flow net;

[0007] S2, system building, the relevant mold is connected according to the system diagram provided by the power plant, the steam medium module is used, the superheater system of the three fluidized bed boilers and the connected header are connected with the main steam header, and the two steam turbines and the extraction system are connected after the main steam header;

[0008] S3, system commissioning, after the system is built, it is compiled and then run, check whether the calculation of each mold is correct, check whether the influence of starting, stopping and variable working condition on the overall header pressure and flow is correct.

[0009] Preferably, the steam provided by the three boilers is uniformly collected into the main steam header.

[0010] Preferably, the mold includes a boiler side mold and a turbine side mold;

[0011] The boiler side mold specifically includes a convection heat exchange calculation module, a semi-radiation and semi-convection heat exchange calculation module, an attemperator module, a steam pipeline and a steam valve, a superheater safety door and an air exhaust valve;

[0012] The turbine side mold specifically includes a high and medium pressure cylinder, a main steam valve, a main steam regulating door, an attemperator and pressure reducer module, and other related valves and pipelines.

[0013] The above mold is used to build the whole main steam system to calculate the pressure and flow in the thermal system.

[0014] Preferably, the extraction system includes a central air pipe and a sleeve, one end of the sleeve is fixedly sleeved on one end of the central air pipe;

[0015] The upper and lower ends of the central air pipe are internally provided with mounting grooves, the mounting grooves are internally provided with sliding rails, the sliding rails are slidably connected with sliding blocks, the outer wall of the sliding block is fixedly sleeved with a bearing, the bearing is sleeved on the outside of the central air pipe and located in the inside of the sleeve, the outer wall of the bearing is fixedly sleeved with a rotating drum, one end of the rotating drum is fixedly sleeved with a cyclone impeller, the rotating drum can drive the cyclone impeller to rotate by rotating the rotating drum, and the position of the cyclone impeller can be adjusted by moving the position of the sliding block.

[0016] Preferably, the other end of the sleeve is fixedly provided with a ring plate, the ring plate and the outside of the sleeve are sleeved with an air inlet pipe, one end of the air inlet pipe is fixedly connected with the ring plate, the other end is fixedly connected with the sleeve through a connecting column, and the ring plate and the air inlet pipe can be used to transport steam into the sleeve.

[0017] Preferably, the inner part of the ring plate is screwed with a baffle plate, one end of the baffle plate is fixedly connected with a bolt for controlling the inclination angle, a plurality of baffle plates are arranged in a ring shape in the inner part of the ring plate, the inclination angle of the baffle plate can be adjusted by rotating the bolt outside, the size of the inlet between the baffle plate and the ring plate is adjusted, and thus the steam admission amount of the ring plate can be adjusted.

[0018] Preferably, the other end of the rotating drum is fixedly sleeved with a driven gear ring, the upper and lower ends of the driven gear ring are toothedly connected with driving gears, the two ends of the driving gears are fixedly installed on the inner wall of the sleeve pipe through fixing plates, one end of the driving gear is fixedly connected with a first bevel gear, one side of the first bevel gear is toothedly connected with a second bevel gear, one end of the second bevel gear penetrates through the sleeve pipe and the air inlet pipe, and one end of the second bevel gear is fixedly connected with a motor, and the motor is fixedly installed on the outer wall of the air inlet pipe. The motor is started to drive the second bevel gear to rotate, the second bevel gear drives the first bevel gear and the driving gear to rotate, and the two groups of driving gears can simultaneously drive the driven gear ring to rotate, so that the rotating drum rotates, and finally the rotating vane wheel rotates.

[0019] Preferably, the two ends of the sliding block are fixedly connected with connecting strips, and guide wheels are arranged at the corners of the connecting strips; the connecting strip at one end of the sliding block penetrates through the sleeve pipe and the air inlet pipe, and the connecting strip at the other end penetrates through the sleeve pipe and is guided at the corner through the guide wheels fixed on the sleeve pipe and the air inlet pipe. The connecting strip or the driving guide wheel is manually pulled, and under the toothed connection and cooperation of the driven gear ring and the driving gear, the driven gear ring can move on the driving gear, so that the connecting strip drives the sliding block to move on the sliding rail.

[0020] Compared with the prior art, the modeling method for solving the pressure flow of the mother pipe circulating fluidized bed unit thermal system has the beneficial effects that: the modeling method can be used not only in the three-furnace two-machine full-range simulation system project of the mother pipe circulating fluidized bed unit in the embodiment, but also in the 1:1 mother pipe circulating fluidized bed unit simulation training system of the full-range full-process, can reflect all characteristics of the mother pipe unit, can realize full-process simulation of the mother pipe circulating fluidized bed unit, and can accurately simulate dynamic and static characteristics and trends under various working conditions of the unit. Through simulation machine training, operation personnel can skillfully master the unit start-stop process and normal operation adjustment, so that the examination project has universality and pertinence, comprehensive, objective and scientific evaluation results are provided for customers, the ability of operation personnel to correctly judge faults and accidents is improved, the ability of safe and economic operation is improved, and anti-accident measures are formulated. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0022] Figure 1 It is a schematic diagram of the system connection structure of the present application.

[0023] Figure 2 It is a schematic diagram of the node model of the present application.

[0024] Figure 3 It is a schematic diagram of the main view of the extraction system.

[0025] Figure 4 It is a schematic diagram of the main view of the extraction system. Figure 3 It is a schematic diagram of the main view of the extraction system.

[0026] Figure 5 It is a schematic diagram of the side view of the driven gear ring and the driving gear.

[0027] 1, center air pipe; 2, sleeve; 3, connecting column; 4, ring plate; 5, baffle; 6, air inlet pipe; 7, mounting groove; 701, sliding rail; 702, sliding block; 703, bearing; 704, rotating drum; 705, cyclone impeller; 706, driven gear ring; 707, driving gear; 708, first bevel gear; 709, second bevel gear; 710, motor; 711, connecting strip; 712, guide wheel. DETAILED DESCRIPTION

[0028] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the present application is used, 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 must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present application, it is also necessary to explain that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] In order to make the purpose, technical scheme and advantages of the present application more clear and obvious, the present application will be further described in detail below by means of drawings and examples. However, it should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the scope of the present application. In addition, in the following description, the description of the known structure and technology is omitted to avoid unnecessary confusion of the concept of the present application.

[0031] Example 1:

[0032] Please refer to Figure 1 A modeling method for pressure and flow of a mother pipe circulating fluidized bed unit thermal system, specifically as follows:

[0033] S1, mold development, for the steam flow network, each mold is programmed with an algorithm to calculate the pressure, temperature and flow in the flow network;

[0034] S2, system building, connecting the relevant molds according to the system diagram provided by the power plant, using the steam medium module to connect the superheater system of the three fluidized bed boilers and the connected mother pipe, and connecting two steam turbines and the extraction system after the main steam mother pipe.

[0035] S3, system commissioning, after the system is built, it is compiled and then run, to check whether the calculation of each mold is correct, and whether the influence of start-up, shutdown and variable working condition on the overall mother pipe pressure and flow is correct.

[0036] Preferably, the steam provided by the three boilers is uniformly collected into the main steam mother pipe.

[0037] Preferably, the mold includes a boiler side mold and a turbine side mold;

[0038] The boiler side mold specifically includes a convection heat exchange calculation module, a semi-radiation semi-convection heat exchange calculation module, an attemperator module, a steam pipe and a steam valve, a superheater safety door, and an air exhaust valve.

[0039] The turbine side mold specifically includes a high and medium pressure cylinder, a main steam valve, a main steam regulating door, an attemperator and pressure reducer module, and other related valves and pipes.

[0040] The working principle of the modeling method of the pressure flow of the mother pipe circulating fluidized bed unit thermal system is as follows: the steam medium module is used to connect three fluidized bed boilers, the overheat system, the mother pipe, two steam turbines connected after the main steam mother pipe, and the steam extraction system. The steam provided by the three boilers is uniformly collected into the main steam mother pipe. The specific boiler side mold includes the convection heat exchange calculation module, the semi-radiation semi-convection heat exchange calculation module, the desuperheater module, the steam pipeline and the steam valve, the overheat safety door, and the air exhaust valve. The specific turbine side mold includes the high and medium pressure cylinder, the main steam valve, the main steam regulating door, the desuperheating and pressure reducing module, and other related valves and pipelines. The entire main steam system is built by these molds to calculate the pressure and flow in the thermal system.

[0041] Example 2:

[0042] Please refer to Figures 1-2 On the basis of the above-mentioned examples, the modeling method of the pressure flow of the mother pipe circulating fluidized bed unit thermal system, in addition to the boiler and turbine body modeling, the core is that the fluid network modeling method is adopted on the connecting mother pipe and the related connecting branch of the boiler and turbine, which ensures the influence of different boilers and turbines on the overall mother pipe pressure and flow during startup, shutdown and variable conditions, and accurately simulates the characteristics of the unit under any operating condition.

[0043] The fluid network algorithm model is introduced as follows:

[0044] (1) Basic terms

[0045] Branch: a channel through which fluid flows. There should be a pressure loss between the inlet and the outlet.

[0046] Node: the intersection of two or more branches.

[0047] Boundary point: a special node whose pressure is a known condition calculated by the fluid network equation set. The selected fluid network boundary point should be a weak coupling point of pressure and flow in the thermal system, such as a large volume point with relatively slow pressure change. When the pressure of a point does not depend on the mass conservation equation, but can be calculated by the energy conservation equation, the point can be used as the boundary point of the fluid network calculation, such as the heater steam side, the condenser steam side, the deaerator, the steam drum and other points where steam and liquid coexist.

[0048] (2) Branch model

[0049] Compressible fluid (such as steam, air, gas, etc.) in actual flow has the effect of mass accumulation at the volume point, and when flowing through components such as valves with pressure loss, the flow process may produce blockage (i.e. the flow changes no longer affected by back pressure) due to the influence of critical pressure ratio.

[0050] The branch equations for compressible and incompressible fluid networks can be uniformly written in the following form:

[0051] R b1 p1-R b2 p2 = w + C b

[0052] (3) Node Model

[0053] Suppose a node with pressure p has m branches connecting it to m upstream pressures p1, p2, ..., p. m The nodes or boundary points are connected, and through nm branches, they are connected to nm downstream pressures, each with a pressure of p. m+1 p m+2 , ..., p n The nodes or boundary points are connected, and the flow of each branch is w. i (i = 1, 2, ..., n). A small amount of flow leaks into this node, w. LE The leakage flow of this node is w LL ,like Figure 2 As shown.

[0054] According to the mass conservation equation of the nodes, we have

[0055]

[0056] Where V is the node volume (m 3 ), where ρ is the nodal fluid density (kg / m³) 3 The derivative term on the left-hand side of the equation shows the effect of the nodal volume on the rate of change of nodal pressure. The larger V is, the greater the nodal mass storage inertia and the slower the rate of pressure change. Expanding the left-hand side of the equation, we have...

[0057]

[0058] Compared to the rate of change of pressure and flow rate, the rate of change of enthalpy and temperature is much slower. Therefore, when calculating pressure and flow rate, the influence of enthalpy and temperature can be temporarily ignored. From the above equation, the nodal model can be obtained.

[0059]

[0060] For incompressible fluids, the above formula can be taken as follows:

[0061] (4) Nodal pressure equation

[0062] From equation (1), the equation for the inflow branch is:

[0063] R b1，i p i，t+1 -R b2，i p t+1 =wi +C b，i i = 1, 2, …, m

[0064] The scheme in this embodiment can be selectively combined with the scheme in other embodiments.

[0065] Embodiment 3:

[0066] Please refer to Figures 3-5 On the basis of the above embodiment, the modeling method of the pressure flow of the mother pipe circulating fluidized bed unit thermal system, the steam extraction system comprises a center air pipe 1 and a sleeve pipe 2, one end of the sleeve pipe 2 is fixedly sleeved on one end of the center air pipe 1;

[0067] The upper and lower ends of the center air pipe 1 are internally provided with mounting grooves 7, the mounting grooves 7 are internally provided with sliding rails 701, the sliding rails 701 are slidingly connected with sliding blocks 702, the outer wall of the sliding blocks 702 is fixedly sleeved with bearings 703, the bearings 703 are sleeved on the outside of the center air pipe 1 and located in the inside of the sleeve pipe 2, the outer wall of the bearings 703 is fixedly sleeved with rotating cylinders 704, one end of the rotating cylinders 704 is fixedly sleeved with cyclone impellers 705; the rotating cylinders 704 can drive the cyclone impellers 705 to rotate by rotating, the position of the cyclone impellers 705 can be adjusted by moving the position of the sliding blocks 702.

[0068] Further, the other end of the sleeve pipe 2 is fixedly installed with a ring plate 4, the ring plate 4 and the outside of the sleeve pipe 2 are sleeved with an air inlet pipe 6, one end of the air inlet pipe 6 is fixedly connected with the ring plate 4, the other end is fixedly connected on the sleeve pipe 2 through the setting of a connecting column 3, through the setting of the ring plate 4 and the air inlet pipe 6, steam can be transported to the inside of the sleeve pipe 2.

[0069] Further, the inside of the ring plate 4 is threadedly connected with baffles 5, one end of the baffles 5 is fixedly connected with a bolt for controlling and adjusting the inclination angle, the baffles 5 are annularly arranged in the inside of the ring plate 4, by rotating the bolt outside, the inclination angle of the baffles 5 can be adjusted, so that the inlet size between the baffles 5 and the ring plate 4 is adjusted, so that the steam inlet amount of the ring plate 4 can be adjusted.

[0070] Further, the other end of the rotating drum 704 is fixedly sleeved with a driven gear ring 706, the upper and lower ends of the driven gear ring 706 are toothedly connected with a driving gear 707, the two ends of the driving gear 707 are fixedly installed on the inner wall of the sleeve pipe 2 through a fixed plate, one end of the driving gear 707 is fixedly connected with a first bevel gear 708, one side of the first bevel gear 708 is toothedly connected with a second bevel gear 709, one end of the second bevel gear 709 penetrates through the sleeve pipe 2 and the air inlet pipe 6, one end of the second bevel gear 709 is fixedly connected with a motor 710, and the motor 710 is fixedly installed on the outer wall of the air inlet pipe 6. The motor 710 is started to drive the second bevel gear 709 to rotate, the second bevel gear 709 drives the first bevel gear 708 and the driving gear 707 to rotate, and the two groups of driving gears 707 simultaneously drive the driven gear ring 706 to rotate, so that the rotating drum 704 rotates, and finally the rotational flow impeller 705 rotates.

[0071] Further, the two ends of the sliding block 702 are fixedly connected with connecting strips 711, and guide wheels 712 are arranged at the corners of the connecting strips 711; one end of the connecting strip 711 of the sliding block 702 penetrates through the sleeve pipe 2 and the air inlet pipe 6, and the other end of the connecting strip 711 penetrates through the sleeve pipe 2, and the connecting strip 711 is guided at the corner through the guide wheel 712, and the guide wheel 712 is fixed on the sleeve pipe 2 and the air inlet pipe 6. The connecting strip 711 is manually pulled or the guide wheel 712 is driven, the driven gear ring 706 is moved relative to the driving gear 707, and the driven gear ring 706 can be moved relative to the driving gear 707, so that the connecting strip 711 drives the sliding block 702 to move on the sliding rail 701.

[0072] Specifically, before the steam enters the steam turbine, in order to accelerate the flow speed of the steam, the steam is extracted into the steam turbine through the steam extraction system. However, the existing steam extraction system is of a straight-flow type and does not have the function of adjusting the rotational flow of the steam, so that the flow of the steam acting on the steam turbine cannot be adjusted and the adjustability is poor.

[0073] The steam extraction system is connected at one end of the main steam pipeline to the left end of the air inlet pipe 6, and one end of the sleeve pipe 2 is connected to the steam turbine through a pipeline. A part of the steam directly enters and is discharged through the central air pipe 1, and at this time the steam is straight-flow steam. When rotation is needed, the motor 710 is started to drive the second bevel gear 709 to rotate, the second bevel gear 709 drives the first bevel gear 708 and the driving gear 707 to rotate, and the two groups of driving gears 707 simultaneously drive the driven gear ring 706 to rotate, so that the rotating drum 704 rotates, and finally the rotational flow impeller 705 rotates.

[0074] When the steam admission amount remains unchanged, that is, the position of the ring plate 4 and the baffle 5 does not change, and the rotational flow needs to be adjusted, the connecting strip 711 or the driving guide wheel 712 is manually pulled, and the driven gear ring 706 can move on the driving gear 707 under the meshing connection and cooperation of the driven gear ring 706 and the driving gear 707, so that the connecting strip 711 drives the sliding block 702 to move on the sliding rail 701, and then the position of the rotational flow impeller 705 below the ring plate 4 and the baffle 5 is changed. When the rotational flow impeller 705 is at the rightmost side of the ring plate 4, the steam entering through the ring plate 4 and the baffle 5 all passes through the rotational flow impeller 705, so that the rotational flow is maximum at this time; on the contrary, the rotational flow is minimum. When the rotational flow impeller 705 is located in the middle of the ring plate 4 and the baffle 5, a part of the steam passing through the rotational flow impeller 705 is rotational flow, and a part of the steam not passing through the rotational flow impeller 705 is straight flow.

[0075] The scheme in this embodiment can be selectively combined with the scheme in other embodiments.

[0076] It should be noted that although the above embodiments have been described in this paper, the patent protection scope of the present application is not limited thereby. Therefore, based on the innovative idea of the present application, the changes and modifications of the embodiments described in this paper, or the equivalent structure, equivalent process or equivalent function transformation using the content of the present application specification and drawings, directly or indirectly apply the above technical solutions to other related technical fields, are all included in the protection scope of the present application patent.

Claims

1. A method for modeling the pressure and flow rate of a circulating fluidized bed unit's thermal system, characterized in that, The specific steps are as follows: S1. Mold development: Write algorithms for each mold in the steam flow network to calculate pressure, temperature, and flow rate in the flow network. S2. System setup: Connect the relevant molds according to the system diagram provided by the power plant. Use the steam medium module to connect the superheater system and header of the three fluidized bed boilers. Connect the two steam turbines and extraction steam system after the main steam header. S3. System trial run: After the system is built, compile and run it to check whether the calculations of each mold are correct and whether the impact of startup, shutdown and changing operating conditions on the overall main pipe pressure and flow is correct. The steam extraction system includes a central duct (1) and a sleeve (2), with one end of the sleeve (2) fixedly sleeved on one end of the central duct (1); The central air duct (1) has an installation groove (7) inside its upper and lower ends. The installation groove (7) has a slide rail (701) inside its interior. A slider (702) is slidably connected to the slide rail (701). A bearing (703) is fixedly sleeved on the outer wall of the slider (702). A rotating cylinder (704) is fixedly sleeved on the outer wall of the bearing (703). A swirl impeller (705) is fixedly sleeved on one end of the rotating cylinder (704).

2. The modeling method for pressure and flow rate of a circulating fluidized bed unit thermal system according to claim 1, characterized in that: The steam supplied by the three fluidized bed boilers is uniformly collected in the main steam header.

3. The modeling method for pressure and flow rate of a circulating fluidized bed unit thermal system according to claim 1, characterized in that: The molds include boiler-side molds and turbine-side molds.

4. The modeling method for pressure and flow rate of a circulating fluidized bed unit thermal system according to claim 1, characterized in that: An annular plate (4) is fixedly installed at the other end of the sleeve (2). An air inlet pipe (6) is fitted around the annular plate (4) and the sleeve (2). One end of the air inlet pipe (6) is fixedly connected to the annular plate (4), and the other end is fixedly connected to the sleeve (2) by a connecting post (3).

5. The modeling method for pressure and flow rate of a circulating fluidized bed unit thermal system according to claim 4, characterized in that: The ring plate (4) is internally threaded with a baffle (5), and one end of the baffle (5) is fixedly connected with a bolt for controlling and adjusting the tilt angle.

6. The method for modeling the pressure and flow rate of a circulating fluidized bed unit's thermal system according to claim 1, characterized in that: The other end of the rotating drum (704) is fixedly sleeved with a driven gear ring (706). The upper and lower ends of the driven gear ring (706) are meshed with a driving gear (707). One end of the driving gear (707) is fixedly connected with a first bevel tooth (708). One side of the first bevel tooth (708) is meshed with a second bevel tooth (709). One end of the second bevel tooth (709) is fixedly connected with a motor (710). The motor (710) is fixedly installed on the outer wall of the air inlet pipe (6).

7. The modeling method for pressure and flow rate of a circulating fluidized bed unit thermal system according to claim 1, characterized in that: The slider (702) is fixedly connected to both ends by connecting strips (711), and guide wheels (712) are provided at the corners of the connecting strips (711).

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