Feeding system of high-pressure fluidized bed

Abstract

The utility model relates to the technical field of fluidized beds, and particularly discloses a feeding system of a high-pressure fluidized bed, which comprises a first-stage stock bin, a feeder with a weighing function, a second-stage stock bin, a material conveying elephant trunk and a gas pressure supplementing system communicated with the material conveying elephant trunk and used for supplementing pressure to the material conveying elephant trunk, the output end of the material conveying elephant trunk is connected with the fluidized bed; a first gate valve is arranged on an outlet of the first-stage stock bin; a first-stage rotary valve matched with the first gate valve for use is arranged at an inlet of the feeder; and a second-stage rotary valve connected with an outlet of the second-stage stock bin is arranged at an inlet of the material conveying articulated chute. Gas sealing and feeding amount control are achieved through cooperation of the first-stage rotary valve and the second-stage rotary valve, gas is introduced into the material conveying elephant trunk through the gas pressure supplementing system for pressure supplementing, high-temperature flue gas in the fluidized bed is prevented from flowing backwards, material conveying is assisted, and finally continuous automatic feeding is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of fluidized beds, and more specifically, to a feeding system for a high-pressure fluidized bed. Background Art

[0002] In recent years, China has become increasingly strict with pollutant emissions. The fluidized bed combustion technology has been vigorously developed due to its advantages such as wide fuel adaptability and low pollutant control costs. For the fluidized bed combustion technology, the feeding system therein is very important, which affects the operation efficiency and economy.

[0003] Currently in the power industry, the feeding system of the fluidized bed combustion technology is mainly applicable to circulating fluidized bed boilers (CFB), and the bed pressure is generally controlled at 8 - 9 kPa. For fluidized beds with higher bed pressures, such as fuel reactors in chemical looping combustion technology, the bed pressure can reach hundreds of kPa. If an atmospheric fluidized bed feeding system is used, problems such as backflow of high-temperature flue gas and bridging will occur, affecting the safe and stable operation of the equipment.

[0004] In addition, currently, the feeding system for fluidized beds with higher pressures uses a pressurized tank and pneumatic conveying to send fuel into the bed, which is difficult to achieve automatic continuous feeding, and has higher manufacturing and maintenance costs. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a feeding system for a high-pressure fluidized bed, which can effectively achieve gas sealing and feeding amount control, and finally realize continuous automatic feeding of materials from low pressure to high pressure.

[0006] The solution adopted by the utility model to solve the technical problem is:

[0007] A feeding system for a high-pressure fluidized bed, comprising a primary bin, a feeder with weighing function, a secondary bin, a feeding chute, and a gas boosting system that is connected to the feeding chute and boosts the pressure of the feeding chute; the output end of the feeding chute is connected to the fluidized bed;

[0008] A first plug valve is provided at the outlet of the primary bin;

[0009] A primary rotary valve that cooperates with the first plug valve is provided at the inlet of the feeder;

[0010] A secondary rotary valve connected to the outlet of the secondary bin is provided at the inlet of the feeding chute.

[0011] In some possible implementation manners, it further includes a protective gas input system connected to the primary bin and the secondary bin respectively.

[0012] In some possible embodiments, the primary bin includes a bin body provided with an inlet and an outlet, a dust collector installed on the bin body and communicating with the interior of the bin body, a weighing system and a bin wall vibrator installed outside the bin body, and a pressure sensor installed on the bin body and used for monitoring the pressure inside the bin body.

[0013] In some possible embodiments, the feeder is a screw weighing feeder.

[0014] In some possible embodiments, a temperature sensor for monitoring the internal temperature is provided on the material conveying chute.

[0015] In some possible embodiments, the material conveying chute includes a vertical section corresponding to the outlet of the secondary bin and used for installing the secondary rotary valve, and an inclined section communicating with the vertical section and arranged obliquely; the temperature sensor is arranged on the vertical section.

[0016] In some possible embodiments, the vertical section includes a first section, an expansion joint, and a second section connected to the secondary bin in sequence; one end of the second section far from the first section is connected to the inclined section; the temperature sensor and the secondary rotary valve are arranged on the first section.

[0017] In some possible embodiments, the inclined section is arranged obliquely downward along the axis of the vertical section, and the angle formed by its axis and the axis of the vertical section is a; 30°≥a≥20°.

[0018] In some possible embodiments, a second plug valve is arranged on the inclined section.

[0019] In some possible embodiments, the gas pressure boosting system is connected to the material conveying chute through a pressure boosting pipe, and the pressure boosting pipe is coaxially arranged with the inclined section.

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0021] The present utility model realizes gas sealing and feeding amount control through the cooperation of the primary rotary valve and the secondary rotary valve, and introduces gas pressure boosting into the material conveying chute through the gas pressure boosting system to prevent the backflow of high-temperature flue gas in the fluidized bed and assist in material conveying, and finally realizes continuous automatic feeding.

[0022] The present utility model can effectively realize real-time monitoring of the temperature inside the material conveying chute through the cooperation of the temperature sensor and the second plug valve. When the temperature is relatively high, the second plug valve is closed to prevent the backflow of high-temperature flue gas;

[0023] The structure of the present utility model is simple and has strong practicability. Description of the Drawings

[0024] Figure 1Schematic structural diagram of the present utility model;

[0025] Wherein: 1 - primary bin, 2 - first slide gate valve, 3 - primary rotary valve, 4 - feeder, 5 - secondary bin, 6 - secondary rotary valve, 7 - material conveying chute, 8 - second slide gate valve, 9 - dust collector, 10 - pressure sensor, 11 - weighing system, 12 - bin wall vibrator, 13 - expansion joint - 14 - temperature sensor, 15 - protective gas input system, 16 - gas pressure compensation system, 161 - compensation gas pipe, 17 - fluidized bed. Specific embodiments

[0026] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "fixation", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. The "first", "second" and similar terms mentioned in this application do not represent any order, quantity or importance, but are only used to distinguish different components. Similarly, terms such as "a" or "one" do not represent a quantity limitation, but indicate that there is at least one. In the implementation of this application, "and / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In the description of the embodiments of this application, unless otherwise stated, the meaning of "a plurality" refers to two or more. For example, a plurality of positioning posts means two or more positioning posts. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0027] The present utility model will be described in detail below.

[0028] Embodiment 1:

[0029] As Figure 1 shown, a feeding system for a high-pressure fluidized bed includes a primary bin 1, a feeder 4 with weighing function, a secondary bin 5, a material conveying chute 7, and a gas pressure compensation system 16 that is connected to the material conveying chute 7 in sequence and compensates the pressure of the material conveying chute 7; the output end of the material conveying chute 7 is connected to the fluidized bed 17;

[0030] A first slide gate valve 2 is provided at the outlet of the primary bin 1; a primary rotary valve 3 that cooperates with the first slide gate valve 2 is provided at the inlet of the feeder 4;

[0031] A secondary rotary valve 6 connected to the outlet of the secondary bin 5 is provided at the inlet of the material conveying chute 7;

[0032] Specifically, the primary rotary valve 3 is controlled by frequency conversion to adjust the material feeding amount by regulating the rotation frequency.

[0033] The outlet of the primary bin 1 is provided at its bottom. The feeder 4 is arranged below the primary bin 1. The primary rotary valve 3 is installed at the inlet of the feeder 4 and is connected to the primary plug valve provided at the outlet of the primary bin 1. The secondary bin 5 is arranged below the feeder 4. The outlet of the secondary bin 5 is provided at its bottom. The conveying chute 7 is arranged below the secondary bin 5 and is communicated with its outlet. A secondary rotary valve 6 connected to the outlet of the secondary bin 5 is provided at the inlet end of the conveying chute 7.

[0034] It should be noted that: during use, first, the material in the primary bin 1 passes through the first plug valve 2, the primary rotary valve 3 and the feeder 4, then enters the secondary bin 5, and then successively passes through the secondary rotary valve 6 and the conveying chute 7 and enters the fluidized bed 17.

[0035] The cooperation of the primary rotary valve 3 and the secondary rotary valve 6 realizes gas sealing and feeding amount control, and gas boosting is introduced into the conveying chute 7 through the gas boosting system 16 to prevent the backflow of the high-temperature flue gas in the fluidized bed 17 and assist in material conveying, and finally realizes continuous automatic feeding.

[0036] In some possible implementation manners, it further includes a protective gas input system 15 respectively connected to the primary bin 1 and the secondary bin 5.

[0037] The protective gas input system 15 inputs nitrogen or carbon dioxide or compressed air into the primary bin 1 and the secondary bin 5 respectively through gas pipelines to protect different materials.

[0038] In some possible implementation manners, the primary bin 1 includes a bin body provided with an inlet and an outlet, a dust collector 9 installed on the bin body and communicated with the inside of the bin body, a weighing system 11 installed outside the bin body and a bin wall vibrator 12, and a pressure sensor 10 installed on the bin body and used for monitoring the pressure inside the bin.

[0039] Specifically, the dust collector 9 filters the dust in the bin. The pressure sensor 10 is used for monitoring the pressure inside the bin. When the pressure inside the bin is relatively high, the dust collector 9 performs back blowing to reduce the pressure inside the bin. The weighing system 11 monitors the weight of the material in the bin. The bin wall vibrator 12 is used to handle the situation of unsmooth material discharge, and enables the material in the primary bin 1 to smoothly enter the secondary bin 5 through vibration.

[0040] In some possible implementation manners, the feeder 4 is a screw weighing feeder 4, so as to effectively realize real-time metering of the feeding amount.

[0041] Specifically, during feeding, first open the first slide valve 2 and adjust the rotation frequency of the primary rotary valve 3 so that the material stored in the primary bin 1 enters the secondary bin 5 at a set feeding rate through the first slide valve 2, the primary rotary valve 3, and the screw weighing feeder 4;

[0042] The material in the secondary bin 5 falls into the conveying chute 7 after passing through the secondary rotary valve 6 and is finally fed into the furnace of the fluidized bed 17.

[0043] In some possible embodiments, a temperature sensor 14 for monitoring the internal temperature is provided on the conveying chute 7.

[0044] In some possible embodiments, the conveying chute 7 includes a vertical section corresponding to the outlet of the secondary bin 5 and for installing the secondary rotary valve 6, and an inclined section communicating with the vertical section and inclined; the other end of the inclined section is connected to the fluidized bed 17; the temperature sensor 14 is provided on the vertical section for monitoring the temperature inside the conveying chute 7.

[0045] In some possible embodiments, the vertical section includes a first section connected to the secondary bin 5 in sequence, an expansion joint 13, and a second section; the end of the second section away from the first section is connected to the inclined section; the temperature sensor 14 and the secondary rotary valve 6 are provided on the first section.

[0046] In some possible embodiments, the inclined section is inclined downward along the axis of the vertical section, and the angle formed by the axis and the axis of the vertical section is a; 30°≥a≥20°.

[0047] In some possible embodiments, a second slide valve 8 is provided on the inclined section.

[0048] In some possible embodiments, the gas pressure boosting system 16 is connected to the conveying chute 7 through a gas supply pipe 161, and the gas supply pipe 161 is coaxially arranged with the inclined section.

[0049] It should be noted that: the secondary rotary valve 6 is connected to the fluidized bed 17 by the conveying chute 7, and the gas pressure boosting system 16 boosts the pressure of the conveying chute 7 by introducing gas into the inside of the conveying chute 7;

[0050] The output end of the gas supply pipe 161 communicates with the elbow between the vertical section and the inclined section, and the gas supply pipe 161 is coaxially arranged with the inclined section and the axes coincide with each other to prevent the reverse flow of high-temperature flue gas and assist the conveying of the material in the conveying chute 7;

[0051] The setting of the expansion joint 13 enables the conveying chute 7 to adapt to the thermal expansion of the fluidized bed;

[0052] The temperature sensor 14 is used to detect the temperature inside the material conveying chute 7. When the temperature inside the material conveying chute 7 is too high, the second slide valve 8 is closed to prevent the backflow of high-temperature flue gas.

[0053] Embodiment 2:

[0054] In this embodiment, coal is used as the material for feeding. The coal is stored in the primary bin 1. The primary bin 1 is protected by introducing nitrogen into it through the protective gas input system 15. The pressure in the primary bin 1 can be monitored by the pressure sensor 10. The coal quantity is monitored by the bin weighing system 11. The dust carried by the gas in the bin is filtered by the dust collector 9, and the problem of poor coal discharging in the bin is handled by the bin wall vibrator 12;

[0055] When feeding, the first slide valve 2 is opened, and the frequency of the primary rotary valve 3 is adjusted to regulate the coal feeding quantity. The pressure before the valve is 0 barg, and the pressure after the valve is 3 barg. The feeding quantity is fed back in real time by the screw weighing feeder 4, and the coal is conveyed into the secondary bin 5;

[0056] The secondary bin 5 is used to receive the coal from the screw weighing feeder 4. The coal enters the material conveying chute 7 through the secondary rotary valve 6. The pressure before the valve is 3 barg, and the pressure after the valve is 30 barg; The gas boosting system 16 introduces gas boost into the material conveying chute 7 through the boost pipe 161 to prevent the backflow of the high-temperature flue gas in the furnace of the fluidized bed 17 and assist in the coal conveying. Finally, the coal is conveyed into the fluidized bed 17 through the material conveying chute 7.

[0057] By using the above feeding system, continuous automatic feeding of the fluidized bed 17 with a relatively high bed pressure can be achieved, such as the fuel reactor in the chemical looping combustion technology. The present utility model can be used for the transformation of the existing feeding system of the fluidized bed 17.

[0058] The present utility model is not limited to the foregoing specific embodiments. The present utility model extends to any new feature or any new combination disclosed in this specification, as well as any new method or process step or any new combination disclosed.

Claims

1. A feeding system for a high pressure fluidized bed, characterized in that: It includes a primary silo, a feeder with a weighing function, a secondary silo, a material conveying chute, and a gas pressure replenishing system connected to the material conveying chute and replenishing the pressure of the material conveying chute; the output end of the material conveying chute is connected to the fluidized bed; A first gate valve is provided at the outlet of the first-level silo; A primary rotary valve used in conjunction with a first gate valve is provided at the inlet of the feeder; A secondary rotary valve connected to the outlet of the secondary silo is arranged at the inlet of the material conveying chute.

2. A feeding system for a high pressure fluidized bed according to claim 1, characterized in that: It also includes a protective gas input system which is respectively connected to the primary silo and the secondary silo.

3. A feeding system for a high pressure fluidized bed according to claim 1, characterized in that: The primary silo includes a silo body provided with an inlet and an outlet, a dust collector installed on the silo body and connected to the interior of the silo body, a weighing system and a silo wall vibrator installed outside the silo body, and a pressure sensor installed on the silo body and used to monitor the pressure inside the silo body.

4. A feeding system for a high pressure fluidized bed according to claim 1, characterized in that: The feeder is a screw weighing feeder.

5. A feeding system for a high pressure fluidized bed according to claim 1, characterized in that: The material conveying chute is provided with a temperature sensor for monitoring the internal temperature thereof.

6. A feeding system for a high pressure fluidized bed according to claim 5, characterized in that: The material conveying chute comprises a vertical section arranged corresponding to the outlet of the secondary silo and used for installing the secondary rotary valve, and an inclined section connected to the vertical section and arranged at an inclination; the temperature sensor is arranged on the vertical section.

7. A feeding system for a high pressure fluidized bed according to claim 6, characterized in that: The vertical section includes a first section, an expansion joint, and a second section which are sequentially connected to the secondary silo; one end of the second section away from the first section is connected to the inclined section; and the temperature sensor and the secondary rotary valve are arranged on the first section.

8. A feeding system for a high pressure fluidized bed according to claim 6, characterized in that: The inclined section is arranged to be inclined downward along the axis of the vertical section, and the angle formed by the axis and the axis of the vertical section is a; 30°≥a≥20°.

9. A feeding system for a high pressure fluidized bed according to claim 8, characterized in that: A second gate valve is arranged on the inclined section.

10. A feeding system for a high pressure fluidized bed according to claim 7, characterized in that: The gas pressure replenishing system is connected to the material conveying chute via a gas replenishing pipe, and the gas replenishing pipe is coaxially arranged with the inclined section.

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