Circulating fluidized bed system

Abstract

The invention discloses a circulating fluidized bed system, which comprises a combustion furnace, a circulating fluidized bed system, a circulating fluidized bed system, a circulating fluidized bed system, a circulating fluidized bed system and a circulating fluidized bed system, and is characterized in that the combustion furnace is provided with a combustion cavity and a feed port and a smoke outlet communicated with the combustion cavity; the separator is provided with a separation cavity, a smoke inlet and a particle outlet, the smoke inlet and the particle outlet are communicated with the separation cavity, and the smoke inlet is communicated with the smoke outlet; the drying device is provided with a drying cavity, a first inlet, a second inlet, a fuel outlet and a steam outlet, the first inlet, the second inlet, the fuel outlet and the steam outlet are communicated with the drying cavity, the first inlet is connected with the feeding pipe, the second inlet is communicated with the particle outlet, and the fuel outlet is communicated with the feeding port. According to the circulating fluidized bed system, the fuel raw material can be dried, and the moisture content in the fuel raw material is effectively reduced, so that the heat value and the combustion efficiency of the fuel raw material are effectively improved, and the performance of the circulating fluidized bed system is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of boilers, and in particular to a circulating fluidized bed system. Background Art

[0002] In recent years, the use of biomass fuel in circulating fluidized bed boilers for power generation has become the main way of biomass utilization. Circulating fluidized bed boilers are the most widely used fuel clean combustion technology in industrial production at this stage. The main advantages of circulating fluidized bed boilers compared to pulverized coal boilers are good fuel adaptability, high combustion efficiency and low pollution gas emissions.

[0003] In the prior art, since most biomass fuels have a high water content, their calorific value is reduced, thereby reducing the combustion efficiency of the boiler. Moreover, when burning biomass fuels with low calorific value and high water content, the boiler output drops significantly. In addition to causing changes in flue gas temperature, it will also quickly consume oxygen in the boiler, causing the boiler bed temperature to drop rapidly, and making the combustion conditions worse. It will also cause abnormal environmental protection parameters of the unit and increase pollutant emissions.

[0004] Therefore, in order to reduce the moisture content of the fuel, the biomass fuel needs to be ventilated and dried or spread out in the power plant for more than a week before combustion, which invisibly increases the storage and management costs of the power plant. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention is to provide a circulating fluidized bed system, which can dry fuel raw materials and effectively reduce the moisture content in the fuel raw materials, thereby effectively improving the calorific value and combustion efficiency of the fuel raw materials, and further effectively improving the performance of the circulating fluidized bed system.

[0006] According to the circulating fluidized bed system of the present invention, the circulating fluidized bed system includes: a combustion furnace, the combustion furnace has a combustion chamber and a feed port and a smoke exhaust port connected to the combustion chamber; a separator, the separator has a separation chamber and a smoke inlet and a particle outlet connected to the separation chamber, the smoke inlet is connected to the smoke exhaust port; a drying device and a feed pipe, the drying device has a drying chamber and a first inlet, a second inlet, a fuel outlet and a steam outlet connected to the drying chamber, the first inlet is connected to the feed pipe, the second inlet is connected to the particle outlet, and the fuel outlet is connected to the feed port.

[0007] According to the circulating fluidized bed system of the present invention, a combustion furnace, a separator, a drying device and a feed pipe are arranged. The combustion furnace has a combustion chamber and a feed port and a smoke exhaust port connected to the combustion chamber. The separator has a separation chamber and a smoke inlet and a particle outlet connected to the separation chamber. The smoke inlet is connected to the smoke exhaust port. The drying device has a drying chamber and a first inlet, a second inlet, a fuel outlet and a steam outlet connected to the drying chamber. The first inlet is connected to the feed pipe, the second inlet is connected to the particle outlet, and the fuel outlet is connected to the feed port. The fuel raw materials can be dried, and the moisture content in the fuel raw materials can be effectively reduced, thereby effectively improving the calorific value and combustion efficiency of the fuel raw materials, and further effectively improving the performance of the circulating fluidized bed system.

[0008] In some embodiments, the circulating fluidized bed system further comprises: a mixing device, the mixing device being disposed in the drying device, the mixing device being configured to mix the fuel raw materials entering from the first inlet with the circulating fuel entering from the second inlet.

[0009] In some embodiments, the drying device also has an air inlet connected to the drying chamber, and the mixing device includes an air distribution plate, which is arranged in the drying chamber, and the air inlet is located on one side of the air distribution plate in the thickness direction, and the first inlet and the second inlet are located on the other side of the air distribution plate in the thickness direction, and a plurality of air holes are formed on the air distribution plate and pass through the air distribution plate along the thickness direction of the air distribution plate.

[0010] In some embodiments, the circulating fluidized bed system further comprises: an air supply device, wherein the air supply device is connected to the air inlet and is used to drive air from the air inlet into the drying chamber.

[0011] In some embodiments, the air distribution plate is horizontally arranged in the drying chamber, the air inlet is formed at the bottom of the drying chamber, and the steam outlet is formed at the top of the drying chamber.

[0012] In some embodiments, the feed pipe has a feed end and a discharge end, and in the direction from the feed end to the discharge end, the feed pipe extends downwardly at an angle, and the discharge end extends into the drying chamber and extends to above the air distribution plate.

[0013] In some embodiments, the separator is arranged on the upper side of the drying device, and the separator is configured to allow the separated circulating fuel to enter the drying chamber through the particle outlet under the action of gravity.

[0014] In some embodiments, the circulating fluidized bed system further comprises: a detection device configured to detect the temperature and humidity in the drying chamber.

[0015] In some embodiments, the separator is a cyclone separator.

[0016] In some embodiments, the circulating fluidized bed system further includes: a connecting pipe, the connecting pipe being connected between the fuel outlet and the feed port, and the connecting pipe extending downwardly in a direction from the fuel inlet toward the feed port.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of a circulating fluidized bed system according to an embodiment of the present invention.

[0019] Reference numerals:

[0020] 100. Circulating fluidized bed system;

[0021] 10. Combustion furnace; 101. Combustion chamber; 102. Feed inlet;

[0022] 20. separator; 201. separation chamber; 202. flue gas inlet; 203. particle outlet;

[0023] 30. Drying device; 301. Drying chamber; 302. First inlet; 303. Second inlet; 304. Fuel outlet; 305. Steam outlet;

[0024] 40. Feed pipe;

[0025] 50. Wind distribution board;

[0026] 60. Connecting pipe. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0028] Reference below Figure 1 A circulating fluidized bed system 100 according to an embodiment of the present invention is described.

[0029] like Figure 1 As shown, according to a circulating fluidized bed system 100 according to an embodiment of the present invention, the circulating fluidized bed system 100 includes: a combustion furnace 10 , a separator 20 , a drying device 30 and a feed pipe 40 .

[0030] The combustion furnace 10 has a combustion chamber 101 and a feed port 102 and a smoke exhaust port connected to the combustion chamber 101; the separator 20 has a separation chamber 201 and a smoke inlet 202 and a particle outlet 203 connected to the separation chamber 201, and the smoke inlet 202 is connected to the smoke exhaust port; the drying device 30 has a drying chamber 301 and a first inlet 302, a second inlet 303, a fuel outlet 304 and a steam outlet 305 connected to the drying chamber 301, the first inlet 302 is connected to the feed pipe 40, the second inlet 303 is connected to the particle outlet 203, and the fuel outlet 304 is connected to the feed port 102.

[0031] For example, the separation chamber 201 of the separator 20 is connected to the combustion chamber 101 of the combustion furnace 10 through the flue gas inlet 202, the separation chamber 201 of the separator 20 is connected to the drying chamber 301 of the drying device 30 through the particle outlet 203 and the second inlet 303, the drying chamber 301 of the drying device 30 is connected to the combustion chamber 101 of the combustion furnace 10 through the fuel outlet 304, and the drying chamber 301 of the drying device 30 is connected to the feed pipe 40 through the first inlet 302. Further, the drying chamber 301 of the drying device 30 can be directly connected to the external atmospheric environment through the steam outlet 305.

[0032] In a specific example, the circulating fluidized bed system 100 is further provided with a fan, an air duct, a tail flue, a convection heating surface, a dust removal device and a chimney, one end of the air duct is connected to the fan, the other end of the air duct is connected to the bottom of the combustion chamber 101 of the combustion furnace 10, the tail flue is connected to the exhaust port, the convection heating surface is arranged in the tail flue, the tail flue is connected to the dust removal device, and the dust removal device is connected to the chimney. In a specific example, the drying device 30 can be a box-type structure, and a ventilation fan can be provided at the steam outlet 305.

[0033] It should be noted that there is circulating fuel in the circulating fluidized bed system 100. The circulating fuel is usually solid particles with a large heat capacity. The circulating fuel can absorb and store heat to help stabilize the temperature in the combustion chamber. When the fuel raw materials are burned in the circulating fluidized bed system 100, the circulating fuel can be fully mixed with the fuel raw materials and the introduced air, and a good fluidization state is ensured, so that the fuel raw materials are suspended in the air flow for full combustion. Therefore, the circulating fuel helps to form a uniform temperature field and concentration field, thereby improving the combustion efficiency and reducing the situation of local overheating or lack of oxygen.

[0034] In this embodiment, when the circulating fluidized bed system 100 is working, the raw fuel and the circulating fuel are quickly mixed in the combustion chamber 101, the raw fuel is quickly burned and produces high-temperature flue gas, and the air flow in the air duct at the bottom of the combustion chamber 101 flows upward with a high flow rate, so that the raw fuel, the circulating fuel and the high-temperature flue gas enter the separation chamber 201 through the flue gas inlet 202. The high-temperature flue gas can enter the tail flue through the exhaust port, and exchange heat with the convection heating surface in the tail flue, and then the flue gas enters the dust removal device and is discharged from the chimney after purification.

[0035] Under the action of the separator 20, the circulating fuel, the incompletely burned fuel raw materials and the high-temperature gas can enter the drying chamber 301 through the particle outlet 203 and the second inlet 303, and contact the fuel raw materials entering the drying chamber 301 from the feed pipe 40 through the first inlet 302. At this time, the circulating fuel and the incompletely burned fuel raw materials have a high temperature. Therefore, the circulating fuel, the incompletely burned fuel raw materials and the high-temperature gas can heat the fuel raw materials entering the drying chamber 301 from the feed pipe 40 through the first inlet 302, so that the water in the fuel raw materials evaporates and is discharged from the steam outlet 305 through the ventilation fan, thereby effectively reducing the water content in the fuel raw materials, thereby effectively improving the combustion efficiency. After the water content in the fuel raw materials is reduced to the predetermined target, the fuel raw materials are sent to the combustion chamber 101 through the fuel outlet 304 and the feed port 102 for combustion.

[0036] According to the circulating fluidized bed system 100 of the embodiment of the present invention, a combustion furnace 10, a separator 20, a drying device 30 and a feed pipe 40 are arranged. The combustion furnace 10 has a combustion chamber 101 and a feed port 102 and a smoke exhaust port connected to the combustion chamber 101. The separator 20 has a separation chamber 201 and a flue gas inlet 202 and a particle outlet 203 connected to the separation chamber 201. The flue gas inlet 202 is connected to the smoke exhaust port. The drying device 30 has a drying chamber 301 and a first inlet 302, a second inlet 303, a fuel outlet 304 and a steam outlet 305 connected to the drying chamber 301. The first inlet 302 is connected to the feed pipe 40, the second inlet 303 is connected to the particle outlet 203, and the fuel outlet 304 is connected to the feed port 102. The fuel raw materials can be dried to effectively reduce the moisture content in the fuel raw materials, thereby effectively improving the calorific value and combustion efficiency of the fuel raw materials, and further effectively improving the performance of the circulating fluidized bed system 100.

[0037] In one embodiment of the present invention, Figure 1 As shown, the circulating fluidized bed system 100 further includes a mixing device, which is disposed in the drying device 30 and is configured to mix the fuel raw materials entering from the first inlet 302 and the circulating fuel entering from the second inlet 303 with each other.

[0038] Specifically, the mixing device can mix the fresh fuel raw materials entering from the first inlet 302 with the circulating fuel and incompletely burned fuel raw materials entering from the second inlet 303, thereby effectively increasing the contact area between the fresh fuel raw materials and the circulating fuel and incompletely burned fuel raw materials, thereby effectively increasing the evaporation rate of water in the fresh fuel raw materials, and further effectively improving the drying efficiency.

[0039] In this embodiment, a mixing device is provided in the circulating fluidized bed system 100. The mixing device is provided in the drying device 30. The mixing device is configured to mix the fuel raw materials entering from the first inlet 302 with the circulating fuel entering from the second inlet 303. This can effectively accelerate the evaporation rate of the water in the fuel raw materials entering from the first inlet 302, thereby effectively improving the drying efficiency.

[0040] In one embodiment of the present invention, Figure 1 As shown, the drying device 30 also has an air inlet connected to the drying chamber 301, and the mixing device includes an air distribution plate 50, which is arranged in the drying chamber 301, and the air inlet is located on one side of the air distribution plate 50 in the thickness direction, and the first inlet 302 and the second inlet 303 are located on the other side of the air distribution plate 50 in the thickness direction. The air distribution plate 50 is formed with a plurality of air holes that pass through the air distribution plate 50 along the thickness direction of the air distribution plate 50.

[0041] For example, the air inlet is connected to the drying chamber 301 and is located at the lower side of the air distribution plate 50, and the first inlet 302, the second inlet 303 and the steam outlet 305 are located at the upper side of the air distribution plate 50. Fresh fuel raw materials can fall onto the air distribution plate 50 through the first inlet 302, and circulating fuel and incompletely burned fuel raw materials can fall onto the air distribution plate 50 through the second inlet 303. The airflow can enter the drying chamber 301 through the air inlet and contact the fresh fuel raw materials through the air holes, thereby accelerating the evaporation of water in the fresh fuel raw materials and accelerating the fluidity of the gas in the drying chamber 301, thereby effectively increasing the speed of water evaporation.

[0042] In this embodiment, an air inlet connected to the drying chamber 301 is provided in the drying device 30, and an air distribution plate 50 is provided in the mixing device. The air distribution plate 50 is provided in the drying chamber 301, and the air inlet is located on one side of the air distribution plate 50 in the thickness direction. The first inlet 302 and the second inlet 303 are located on the other side of the air distribution plate 50 in the thickness direction. A plurality of air holes are formed on the air distribution plate 50 and pass through the air distribution plate 50 along the thickness direction of the air distribution plate 50, which can effectively accelerate the fluidity of the gas in the drying chamber 301, thereby effectively improving the evaporation rate of water in the drying chamber 301.

[0043] In one embodiment of the present invention, Figure 1As shown, the circulating fluidized bed system 100 further includes: an air supply device, which is connected to the air inlet and is used to drive air into the drying chamber 301 from the air inlet.

[0044] For example, the air supply device may be a blower, and the air volume and air pressure at the air inlet can be adjusted by adjusting the blower to meet different operating requirements. Furthermore, a heating device may be added to the air supply device to increase the temperature of the gas at the air inlet and reduce the humidity of the gas, thereby effectively increasing the drying speed.

[0045] When the airflow generated by the air supply device enters the drying chamber 301 from the air inlet, the airflow can pass through the air holes to fully mix the fresh fuel raw materials with the circulating fuel and the incompletely burned fuel raw materials, thereby effectively improving the mixing efficiency, thereby effectively improving the heat transfer efficiency and effectively ensuring the drying effect. In addition, it can also avoid the coking problem caused by local overheating, thereby effectively improving the utilization rate of the fuel raw materials.

[0046] In this embodiment, an air supply device is provided in the circulating fluidized bed system 100, and the air supply device is connected to the air inlet to drive air from the air inlet into the drying chamber 301, which can effectively improve the mixing efficiency in the drying chamber 301, thereby effectively ensuring the drying effect and effectively improving the reliability. In addition, the coking problem caused by local overheating can be avoided, thereby effectively improving the utilization rate of fuel raw materials.

[0047] In one embodiment of the present invention, Figure 1 As shown, the air distribution plate 50 is horizontally arranged in the drying chamber 301 , the air inlet is formed at the bottom of the drying chamber 301 , and the steam outlet 305 is formed at the top of the drying chamber 301 .

[0048] In a specific example, if Figure 1 As shown, the air distribution plate 50 is arranged horizontally, the air inlet is located on the lower side of the air distribution plate 50 and is arranged at the bottom of the drying chamber 301, and the steam outlet 305 is located on the upper side of the air distribution plate 50 and is arranged at the top of the drying chamber 301, thereby ensuring that the airflow can pass through the fuel raw material falling from the first inlet 302 onto the air distribution plate 50 from bottom to top, so as to achieve uniform contact between the airflow and the fuel raw material, thereby promoting the evaporation rate of water.

[0049] After the moisture in the fuel raw materials is heated and turned into water vapor, it can naturally rise and gather in the upper space of the drying chamber 301. The steam outlet 305 is set at the top of the drying chamber 301 to effectively discharge the water vapor from the drying chamber 301, thereby avoiding the continuous accumulation of water vapor in the drying chamber 301 and reducing the influence of water vapor on the drying effect, thereby effectively ensuring the drying effect.

[0050] In this embodiment, the air distribution plate 50 is horizontally arranged in the drying chamber 301, the air inlet is formed at the bottom of the drying chamber 301, and the steam outlet 305 is formed at the top of the drying chamber 301, which can effectively increase the evaporation rate of water in the drying chamber 301, thereby effectively improving the drying efficiency.

[0051] In one embodiment of the present invention, Figure 1 As shown, the feed pipe 40 has a feed end and a discharge end. In the direction from the feed end to the discharge end, the feed pipe 40 extends downwardly at an angle, and the discharge end extends into the drying chamber 301 and extends to above the air distribution plate 50.

[0052] For example, after being crushed, the fuel raw materials enter the feed pipe 40 from the feed end of the feed pipe 40. Since the feed pipe 40 extends downwardly from the feed end to the discharge end, the fuel raw materials can continue to roll from the feed end to the discharge end under the action of gravity, and finally enter the drying chamber 301 and fall onto the air distribution plate 50.

[0053] In this embodiment, a feed end and a discharge end are arranged in the feed pipe 40. In the direction from the feed end to the discharge end, the feed pipe 40 extends downwardly in an inclined manner, and the discharge end extends into the drying chamber 301 and extends above the air distribution plate 50, so that the fuel raw materials can enter the drying chamber 301 under the action of gravity and fall onto the air distribution plate 50, thereby effectively reducing the risk of blockage. In addition, the demand for external power can be effectively reduced, thereby effectively simplifying the structure and reducing costs.

[0054] In one embodiment of the present invention, Figure 1 As shown, the separator 20 is arranged on the upper side of the drying device 30 , and the separator 20 is configured to allow the separated circulating fuel to enter the drying chamber 301 through the particle outlet 203 under the action of gravity.

[0055] When the incompletely burned fuel raw materials, circulating fuel and high-temperature flue gas enter the separation chamber 201 through the flue gas inlet 202, under the action of gravity, the circulating fuel and the incompletely burned fuel raw materials can enter the drying chamber 301 through the particle outlet 203 and the second inlet 303, and fall onto the air distribution plate 50 in the drying chamber 301.

[0056] In this embodiment, the separator 20 is arranged on the upper side of the drying device 30, and the separator 20 is configured to allow the separated circulating fuel to enter the drying chamber 301 through the particle outlet 203 under the action of gravity, which can effectively simplify the separation process of the circulating fuel, thereby effectively ensuring the reliability of the separation effect. In addition, it can also effectively simplify the structure of the circulating fluidized bed system 100 and effectively reduce energy consumption.

[0057] In one embodiment of the present invention, Figure 1As shown, the circulating fluidized bed system 100 further includes: a detection device, which is configured to detect the temperature and humidity in the drying chamber 301 .

[0058] Specifically, the detection device may include a temperature sensor and a humidity sensor, wherein the temperature sensor can detect the temperature in the drying chamber 301, and the humidity sensor can detect the humidity in the drying chamber 301. Further, the number of the detection devices may be multiple, for example, the number of the detection devices may be two, three, four, five, or more than six, and the multiple detection devices may be arranged at different positions in the drying chamber 301 according to the detection requirements to ensure the accuracy of the detection results.

[0059] In a specific example, the detection device is electrically connected to the control system, and the control system can monitor and record changes in temperature and humidity in the drying chamber 301, so as to help the operator understand the changes in the drying process in the drying chamber 301, thereby helping the operator to optimize the drying conditions to improve the drying efficiency.

[0060] In this embodiment, a detection device is provided in the circulating fluidized bed system 100. The detection device is configured to detect the temperature and humidity in the drying chamber 301. The temperature and humidity in the drying chamber 301 can be effectively detected, thereby helping the operator to understand the changes in the drying conditions in the drying chamber 301.

[0061] In one embodiment of the present invention, Figure 1 As shown, the separator 20 is a cyclone separator 20. It should be noted that the cyclone separator 20 can achieve gas-solid separation based on the action of centrifugal force. When the high-temperature flue gas containing circulating fuel and incompletely burned fuel raw materials enters the separator 20 tangentially, a rotating airflow is formed in the separation chamber 201. Due to the action of centrifugal force, heavier particles are pushed to the wall of the separator 20 and slide down along the wall to the particle outlet 203 at the bottom for discharge, while the lighter high-temperature flue gas is discharged through the exhaust port.

[0062] Furthermore, the cyclone separator 20 can process particles of different particle size ranges and is suitable for various types of fuel raw materials and working conditions. In addition, the cyclone separator 20 has a simple structure, is easy to manufacture and install, and does not require complex power equipment. The separation process can be completed only by relying on the kinetic energy of the airflow itself, thereby effectively reducing energy consumption and costs.

[0063] In this embodiment, by setting the separator 20 as a cyclone separator 20, not only the service life of the separator 20 can be effectively improved, but also the applicability and stability of the circulating fluidized bed system 100 can be effectively improved. In addition, the purpose of reducing costs and increasing efficiency can be effectively achieved.

[0064] In one embodiment of the present invention, Figure 1As shown, the circulating fluidized bed system 100 further includes: a connecting pipe 60, which is connected between the fuel outlet 304 and the feed port 102, and extends downwardly in a direction from the fuel inlet toward the feed port 102. Figure 1 As shown, one end of the connecting pipe 60 is connected to the fuel outlet 304 of the drying device 30 , and the other end of the connecting pipe 60 is connected to the feed port 102 of the combustion furnace 10 .

[0065] After the mixture of the raw material and the circulating fuel is dried in the drying chamber 301, the mixture of the raw material and the circulating fuel can enter the connecting pipe 60 from the fuel outlet 304, and enter the combustion chamber 101 through the feed port 102 under the action of gravity for combustion. The inclined connecting pipe 60 can effectively avoid the accumulation of the mixture of the raw material and the circulating fuel, reduce the risk of blockage, and thus ensure the smooth flow of the mixture of the raw material and the circulating fuel.

[0066] In this embodiment, a connecting pipe 60 is provided in the circulating fluidized bed system 100. The connecting pipe 60 is connected between the fuel outlet 304 and the feed port 102. In the direction from the fuel inlet toward the feed port 102, the connecting pipe 60 extends downwardly and obliquely, which can effectively ensure the smooth flow of the mixture of the fuel raw material and the circulating fuel in the connecting pipe 60, thereby improving the circulation efficiency. In addition, the structure of the circulating fluidized bed system 100 can be effectively simplified, and complicated devices and operations are not required, thereby effectively improving the reliability of the circulating fluidized bed system 100 and effectively improving the convenience of operation.

[0067] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0068] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0069] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0070] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0071] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A circulating fluidized bed system, It is characterized in that include: A combustion furnace, the combustion furnace having a combustion chamber and a feed inlet and a smoke exhaust port communicated with the combustion chamber; A separator, the separator comprising a separation chamber and a smoke inlet and a particle outlet communicated with the separation chamber, the smoke inlet being communicated with the smoke exhaust port; A drying device and a feed pipe, wherein the drying device has a drying chamber and a first inlet, a second inlet, a fuel outlet and a steam outlet connected to the drying chamber, the first inlet is connected to the feed pipe, the second inlet is connected to the particle outlet, and the fuel outlet is connected to the feed port.

2. The circulating fluidized bed system according to claim 1, It is characterized in that The drying device further comprises a mixing device, wherein the mixing device is disposed in the drying device and is configured to mix the fuel raw material entering from the first inlet with the circulating fuel entering from the second inlet.

3. The circulating fluidized bed system according to claim 2, It is characterized in that The drying device also has an air inlet connected to the drying chamber. The mixing device includes an air distribution plate, which is arranged in the drying chamber. The air inlet is located on one side of the air distribution plate in the thickness direction, and the first inlet and the second inlet are located on the other side of the air distribution plate in the thickness direction. The air distribution plate is formed with a plurality of air holes that pass through the air distribution plate along the thickness direction of the air distribution plate.

4. The circulating fluidized bed system according to claim 3, It is characterized in that Also includes: An air supply device is connected to the air inlet and is used to drive air from the air inlet into the drying chamber.

5. The circulating fluidized bed system according to claim 4, It is characterized in that The air distribution plate is horizontally arranged in the drying chamber, the air inlet is formed at the bottom of the drying chamber, and the steam outlet is formed at the top of the drying chamber.

6. The circulating fluidized bed system according to claim 5, It is characterized in that The feed pipe has a feed end and a discharge end. In the direction from the feed end to the discharge end, the feed pipe extends downwardly in an inclined manner, and the discharge end extends into the drying chamber and extends to above the air distribution plate.

7. A circulating fluidized bed system according to any one of claims 1 to 6, It is characterized in that The separator is arranged on the upper side of the drying device, and the separator is configured to allow the separated circulating fuel to enter the drying chamber through the particle outlet under the action of gravity.

8. A circulating fluidized bed system according to any one of claims 1 to 6, It is characterized in that Also includes: A detection device is configured to detect the temperature and humidity in the drying chamber.

9. A circulating fluidized bed system according to any one of claims 1 to 6, It is characterized in that The separator is a cyclone separator.

10. A circulating fluidized bed system according to any one of claims 1 to 6, It is characterized in that The fuel injection molding machine further comprises a connecting pipe connected between the fuel outlet and the feed port, and the connecting pipe extends obliquely downward in a direction from the fuel inlet toward the feed port.

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