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Ash-slag cooling and sorting device and circulating fluidized bed boiler using same

A circulating fluidized bed, ash and slag cooling technology, applied in fluidized bed combustion equipment, solid separation, chemical instruments and methods, etc., can solve problems such as water leakage, slag leakage, etc. Good performance, the effect of restricting dust pollution

Inactive Publication Date: 2010-12-01
刘柏谦 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0033] ●The sealing effect is not as good as that of the Fengshui-cooled fluidized bed slag cooler, and there are problems of water leakage and slag leakage

Method used

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  • Ash-slag cooling and sorting device and circulating fluidized bed boiler using same
  • Ash-slag cooling and sorting device and circulating fluidized bed boiler using same
  • Ash-slag cooling and sorting device and circulating fluidized bed boiler using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1: Only fluidized bed slag cooler is used.

[0049] When there are few large particles in the furnace fuel (the mass percentage of particles above 10mm does not exceed 5% of the total ash), only the fluidized bed slag cooler is used. At this time, the same as the circulating fluidized bed boiler using the fluidized bed slag cooler, there is no change in the slag cooler and its connection with the boiler and the layout of the boiler island. channel.

Embodiment 2

[0051] The cold slag discharge of a circulating fluidized bed boiler is 100t / h, and the particles exceeding 10mm in the furnace fuel account for 23% of the total particle mass. Taking 8mm as the cut-off point of ash size, large particles account for about 30% of the total mass at this time.

[0052] The hot ash sorting mechanism adopts high-temperature and wear-resistant metal strips with a diameter of 15mm, which are arranged in 3 layers at an angle of 50 degrees to the horizontal. The pitch of the first layer is 35mm, sorting out the particles larger than 20mm; the pitch of the second layer is 27mm, sorting out the particles larger than 12mm; the pitch of the third layer is 23mm, sorting out the particles larger than 8mm.

[0053] Equipped with a 4-chamber water-cooled drum slag cooler with a slag import and export center distance of 4m and a diameter of 1.4m, it can cool 25,000kg / h ash from 850°C to 160°C at a speed of 9rpm.

[0054] The fluidized bed slag cooler is design...

Embodiment 3

[0056] The cold slag discharge of a circulating fluidized bed boiler is 200t / h, and the particles exceeding 10mm in the furnace fuel account for 23% of the total particle mass. Taking 4mm as the cut-off point of ash size, large particles account for about 50% of the total mass at this time.

[0057] The hot ash sorting mechanism adopts high temperature and wear-resistant metal strips with a diameter of 15mm, and is arranged in 5 layers at an angle of 50 degrees with the horizontal. The pitch of the first layer is 35mm, sorting out the particles larger than 20mm; the pitch of the second layer is 27mm, sorting out the particles larger than 12mm; the pitch of the third layer is 23mm, sorting out the particles larger than 8mm; the fourth layer of pitch The pitch of the fifth layer is 19mm, and the particles larger than 4mm are sorted out.

[0058] Equipped with 4 water-cooled drum slag coolers with 4 chambers and a diameter of 1.4m, the center distance between the import and expo...

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Abstract

The invention provides a device for cooling high-temperature ash and slag of a circulating fluidized bed boiler, and belongs to the high-temperature ash and slag cooling field of the circulating fluidized bed boiler. The device consists of a hot ash sorting mechanism, a roller slag cooler and a fluidized bed heat exchanger. The hot ash from a slag discharge pipe of the circulating fluidized bed boiler is divided into large granules and small granules through the hot ash sorting mechanism, wherein the large granules enter the roller slag cooler through an inlet pipe of the roller slag cooler; and the small granules enter the fluidized bed heat exchanger through an inlet pipe of the fluidized bed heat exchanger to discharge heat and then are returned to a hearth of the circulating fluidized bed boiler along with fluidized air through an outlet pipe. The device has the advantage of fully exerting the technical advantages of an air-water combined cooling fluidized bed slag cooler and the roller slag cooler by high-temperature separation of the hot ash. Through the technical route that the hot ash is cooled according to the sizes respectively, the fine ash is returned to the hearth through the fluidized bed slag cooler and the crude slag is cooled for other use, the dust pollution of the roller slag cooler is effectively restricted. The graded cooling of the granules can effectively reduce the volume of the slag cooler, and is convenient for boiler design and boiler operation.

Description

Technical field: [0001] The invention belongs to the field of circulating fluidized bed boiler high-temperature ash cooling, and provides a cooling device for circulating fluidized bed boiler high-temperature ash. Background technique: [0002] The slag cooler (including the slag cooler with heating surface) itself is a process-specific heat exchange device. Unlike surface heat exchangers, most of the heat exchange surfaces of the slag cooler are in contact with high concentrations of solid particles for heat exchange. The resulting heat transfer effect is stronger than non-contact heat transfer. [0003] According to the cooling principle, the type of slag cooler can be divided into non-mechanical type and mechanical type. Non-mechanical slag coolers mainly include air-water-cooled fluidized slag coolers and air-trough slag coolers. The main forms of mechanical slag coolers are water-cooled auger type, water-cooled drum type and high-strength steel belt type. At present...

Claims

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Application Information

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IPC IPC(8): F23J1/06F23C10/26F23C10/00B07B1/00B07B1/46
Inventor 刘柏谦王立刚
Owner 刘柏谦
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