Smokeless oil-saving starting system of circulating fluidized bed boiler

A technology of circulating fluidized bed and start-up system, which is applied in the direction of fluidized bed combustion equipment, burning fuel in molten state, lighting and heating equipment, etc. Difficult temperature control and other problems to achieve the effect of improving operating economy, avoiding over-temperature coking or damage to refractory and wear-resistant materials, and easy control of start-up parameters

Inactive Publication Date: 2016-05-25
HUANENG CLEAN ENERGY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the limitation of the principle of the circulating fluidized bed boiler, the bed material must be heated to the ignition temperature of the coal before starting to slowly feed the coal. However, due to the design of the main body and the oil gun and other equipment of the active boiler, it is easy to cause the following problems : 1. Long start-up time, high fuel consumption; 2. Low combustion efficiency, serious black smoke; 3. Difficult to control start-up parameters, easy to over-temperature coking or damage to refractory and wear-resistant materials; 4. Uneven combustion, local temperature difficult to control

Method used

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  • Smokeless oil-saving starting system of circulating fluidized bed boiler
  • Smokeless oil-saving starting system of circulating fluidized bed boiler
  • Smokeless oil-saving starting system of circulating fluidized bed boiler

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specific Embodiment approach 1

[0035] Such as figure 1 , figure 2 and image 3 As shown, taking the cold start-up of a 480t / h circulating fluidized bed boiler as an example, the coal used is anthracite with low volatile content, and the volatile content Vdaf of the coal-fired dry ash-free base of the starting fuel system is 25%. Add the bed material to a thickness of 500mm before starting, and adjust the pressure of the compressed air 14 of the combustion system to 1MPa. The bed material is maintained in a micro-bubbling fluidized state through the uniform flow breeze system 1, and then put into the air duct burner system 4, and the compressed air 14 atomizes the ignition fuel 15 into tiny oil droplets with a diameter of 30 μm and sends it into the air duct for combustion , due to the thinner bed material, the bed temperature rises rapidly, and the heating rate is controlled at 120°C / h. When the bed temperature rises to 400°C, the bed burner system 3 is put into operation. When the bed temperature rise...

specific Embodiment approach 2

[0036] Such as figure 1 , figure 2 and image 3 As shown, taking a 220t / h circulating fluidized bed boiler at warm state as an example, the coal type is anthracite, and the coal-fired dry ash-free base volatile Vdaf of the starting fuel system is 35%. Adjust the bed material to about 600mm when the boiler is pressurized. After pressing the fire, the bed temperature drops to 400°C, and then start up according to the warm state start-up procedure. Start the induced draft fan, the fluidization fan, the secondary fan and the primary fan in turn, and adjust the pressure of the compressed air 14 of the combustion system to 1MPa. The bed material is maintained in a micro-bubbling fluidized state through the uniform flow breeze system 1, and then put into the air duct burner system 4 and the bed burner system 3. When the bed temperature rises to 450°C, start the fuel system 5 and put it into operation. The system operates in the mode of micro-coal feeding, and gradually increases...

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Abstract

A smokeless oil-saving starting system of a circulating fluidized bed boiler comprises a flow equalizing breeze system, a bed material supplementing system, a bed combustor system, an air flue combustor system, a starting fuel system, a small-size dense-phase zone and an adjustable material returning system. Micro bubbling fluidization when the boiler is started is realized through the flow equalizing breeze system, and the heat loss during starting is reduced substantially; the bed combustor system and the air flue combustor system are provided with compressed air atomization oil guns, liquid drops are small in size, high in combustion efficiency and good in heat transfer effect, coal can be fed as early as possible when the boiler is started, and fuel oil is saved; by means of the starting mode that the small-size dense-phase zone is matched with the small bed material height, starting power consumption of a primary air fan can be reduced, temperature rise time is shortened, and the material is intermittently put into the bed material supplementing system after the temperature reaches a specified value; multiple technical links are matched to finally achieve smokeless oil-saving fast starting of the boiler.

Description

technical field [0001] The invention belongs to the technical field of design and operation of a circulating fluidized bed boiler, and in particular relates to a smokeless and fuel-saving start-up system of a circulating fluidized bed boiler. Background technique [0002] Circulating fluidized bed boilers have developed rapidly in the past 10 years due to the advantages of a wide range of coal types, less pollutant emissions, and large load regulation ratios, and their total installed capacity has continued to increase. However, due to the limitation of technical conditions, there are still some shortcomings in itself. Due to the limitation of the principle of the circulating fluidized bed boiler itself, the bed material must be heated to the ignition temperature of the coal before starting to slowly feed the coal. However, due to the design of the main body and the oil gun and other equipment of the active boiler, it is easy to cause the following problems : 1. Long start-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C10/10F23C10/18
CPCF23C10/10F23C10/18F23C2900/99006
Inventor 黄中刘冠杰江建忠徐正泉肖平
Owner HUANENG CLEAN ENERGY RES INST
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