CN203281221U

CN203281221U - Dry fine continuous desulfurization device for CFB (Circulating fluid bed) boiler

Info

Publication number: CN203281221U
Application number: CN201320262949XU
Authority: CN
Inventors: 张培华; 杨玉环; 吴勇刚
Original assignee: SHANXI PINSHUO WASTE COAL POWER GENERATION Co Ltd
Current assignee: SHANXI PINSHUO WASTE COAL POWER GENERATION Co Ltd
Priority date: 2013-05-15
Filing date: 2013-05-15
Publication date: 2013-11-13
Anticipated expiration: 2023-05-15

Abstract

The utility model relates to a dry fine continuous desulfurization device for a CFB boiler, and belongs to the field of desulfurization of boilers. The desulfurization device comprises a chimney, and further comprises a CFB boiler furnace chamber, a cyclone separator, a tail chimney flue, a limestone calcinator, an air pre-heater, a pre-dusting apparatus, an ash silo a, and a tail flue gas semi-dry desulfurization system, wherein the tail flue gas semi-dry desulfurization system is composed of an SO2 absorber, a circulating liquid tank, a digestion tank, an ash silo b and a bag-type dust remover; the CFB boiler furnace chamber is connected to the cyclone separator and the limestone calcinator respectively through a flue gas pipeline; the bottom of the cyclone separator is connected with the furnace chamber via a material return pipeline, and the top of the cyclone separator is connected to the tail chimney flue via the flue gas pipeline; limestone powder is conveyed to the limestone calcinator via a powder conveying pipeline, and the bottom of the limestone calcinator is connected with the digestion tank through the powder conveying pipeline.

Description

The meticulous continuous desulfurization device of a kind of dry method for the CFB boiler

Technical field

The utility model belongs to the boiler desulfurization field, particularly the meticulous continuous desulfurization device of a kind of dry method for the CFB boiler.

Background technology

Along with the further increasing of environmental protection standard, the requirement of Air Pollutant Emission limit value is more and more stricter.For the desulfurization situation of current Properties of CFB, the factors such as bed temperature, desulfurizing agent quality are difficult to control to optimum range, only rely on desulfuration in furnace can not reach SO ₂Emission request, therefore need to adopt SO in the method reduction flue gas that desulfuration in furnace combines with the tail flue gas desulfurization ₂Content, to meet the pollutant emission requirement of environmental regulations.

At present, flue gas desulfurization method commonly used has the several different methods such as wet desulfurization of flue gas by limestone-gypsum method, semi-dry process flue gas desulphurization and the ammonia process of desulfurization.Wherein the semi-dry desulphurization method is mainly to utilize to contain lime (drier of CaO or dry calcium hydroxide (Ca (OH) ₂) absorb the SO in flue gas ₂The while semi-dry desulfurizing process takes up an area less, the investment operating cost is low, again can be in the situation that the moderate acquisition of calcium to sulphur mole ratio be higher even near the desulfuration efficiency of wet desulphurization level, be particularly suitable for building the limited old factory transformation in place and adopt, be an important development direction of desulfur technology from now on.

For the drier that contains lime (CaO) in the semi-dry desulphurization technology or dry calcium hydroxide (Ca (OH) ₂) all need CaO, along with the severization of environmental protection standard, flue gas desulfurization becomes the significant challenge that current coal-fired unit faces, and built unit Summary of Semi-dry Flue Gas Desulfurization is also more and more received publicity.Therefore how desulphurization in circulating fluidized bed boiler carries out reasonable combination with the tail flue gas semi-dry desulphurization, guarantees under unit safety economical operation prerequisite, improves the utilization rate of desulfurizing agent and the desulfuration efficiency of unit and becomes the hot issue that the research worker studies.

Summary of the invention

The purpose of this utility model is to solve above-mentioned the deficiencies in the prior art, and a kind of meticulous continuous desulfurization device of dry method that is used for the CFB boiler that semi-dry desulphurization desulfurizing agent used is produced that has in continuous desulfurization technique is provided;

The utility model for the technical scheme that solves above-mentioned technical deficiency and adopt is: the meticulous continuous desulfurization device of a kind of dry method for the CFB boiler, comprise chimney (13), other also comprises: CFB boiler furnace (1), cyclone separator (2), back-end ductwork (3), limestone calcination device (4), air preheater (5), pre-duster (6), grey storehouse a(10), the tail flue gas semi-dry desulphurization system; Wherein: described tail flue gas semi-dry desulphurization system is by SO ₂Absorber (7), circulation flow container (8), digester (9), grey storehouse b(11) sack cleaner (12) composition; Described CFB boiler furnace (1) is connected to respectively cyclone separator (2) and limestone calcination device (4) by flue; Cyclone separator (2) bottom is connected with burner hearth (1) through the feed back pipeline, and cyclone separator (2) top is connected to back-end ductwork (3) through flue; Agstone is delivered to limestone calcination device (4) through pulverized coal feed pipe, and limestone calcination device (4) bottom is connected with digester (9) by pulverized coal feed pipe; Limestone calcination device (4) top merges pipeline and is connected to air preheater (5), air preheater (5), pre-duster (6), SO again after flue is connected to the flue of by cyclone separator (2), being drawn ₂Absorber (7), sack cleaner (12) and chimney (13) are connected by flue successively; Pre-duster (6) is through ash conveying pipe and grey storehouse a(10) be connected, sack cleaner (12) is through ash conveying pipe and grey storehouse b(11) be connected; Digester (9) and SO ₂Absorber (7) connects through calcium hydroxide breast conveyance conduit, SO ₂Absorber (7) to the flow container that circulates (8) connects through pulverized coal feed pipe, and circulation flow container (8) is to SO ₂Absorber (7) connects by the desulfurizing agent circulating line; Sack cleaner (12) is to grey storehouse b(11) ash conveying pipe through circulating ash pipeline and SO ₂Absorber (7) to the pulverized coal feed pipe of the flow container that circulates (8) connects.

, because the utility model has adopted technique scheme, have that the desulfurizing agent reparation technology used of semi-dry desulphurization in continuous desulfurization technique is simple, the investment operating cost is low; The desulfurizing agent CaO that produces can meet semi-dry desulphurization consumption in continuous processing, the output that the agstone amount that can add by control is according to demand simultaneously regulated desulfurizing agent; The continuous desulfurization technique that dry desulfurization combines with the afterbody semi-dry desulphurization in stove, with the desulfurizing agent do not collected with the flue gas outflow in part sack cleaner gleanings and absorber and desulfurization reaction product together deliver to the circulation flow container again pump power be delivered to SO ₂Recycle in absorber, greatly improved sorbent utilization and desulfuration efficiency, make not only economical operation but also meet the environment protection emission requirement of enterprise.

Description of drawings

Fig. 1 is structural representation of the present utility model;

The specific embodiment

Embodiment 1

As shown in Figure 1: the meticulous continuous desulfurization device of a kind of dry method for the CFB boiler in the present embodiment, comprise chimney 13, other also comprises: CFB boiler furnace 1, cyclone separator 2, back-end ductwork 3, limestone calcination device 4, air preheater 5, pre-duster 6, grey storehouse a10, tail flue gas semi-dry desulphurization system; Wherein: described tail flue gas semi-dry desulphurization system is by SO ₂Absorber 7, circulation flow container 8, digester 9, grey storehouse b11 sack cleaner 12 form; Described CFB boiler furnace 1 is connected to respectively cyclone separator 2 and limestone calcination device 4 by flue; Cyclone separator 2 bottoms are connected with burner hearth 1 through the feed back pipeline, and cyclone separator 2 tops are connected to back-end ductwork 3 through flue; Agstone is delivered to limestone calcination device 4 through pulverized coal feed pipe, and limestone calcination device 4 bottoms are connected with digester 9 by pulverized coal feed pipe; Limestone calcination device 4 tops merge pipeline and are connected to air preheater 5, air preheater 5, pre-duster 6, SO again after flue is connected to the flue of by cyclone separator 2, being drawn ₂Absorber 7, sack cleaner 12 and chimney 13 are connected by flue successively; Pre-duster 6 is connected with grey storehouse a10 through ash conveying pipe, and sack cleaner 12 is connected with grey storehouse b11 through ash conveying pipe; Digester 9 and SO ₂Absorber 7 connects through calcium hydroxide breast conveyance conduit, SO ₂Absorber 7 to circulation flow container 8 connects through pulverized coal feed pipe, and circulation flow container 8 is to SO ₂Absorber 7 connects by the desulfurizing agent circulating line; Sack cleaner 12 to the ash conveying pipe of grey storehouse b11 through circulating ash pipeline and SO ₂Absorber 7 to the pulverized coal feed pipe of circulation flow container 8 connects.

For improving sorbent utilization, with the desulfurizing agent do not collected with the flue gas outflow in part sack cleaner 12 gleanings and absorber and desulfurization reaction product together deliver to circulation flow container 8 again pump power be delivered to SO ₂Recycle in absorber 7.

Claims

1. meticulous continuous desulfurization device of dry method that is used for the CFB boiler, comprise chimney (13), it is characterized in that it also comprises: CFB boiler furnace (1), cyclone separator (2), back-end ductwork (3), limestone calcination device (4), air preheater (5), pre-duster (6), grey storehouse a(10), the tail flue gas semi-dry desulphurization system; Wherein: described tail flue gas semi-dry desulphurization system is by SO ₂Absorber (7), circulation flow container (8), digester (9), grey storehouse b(11) sack cleaner (12) composition; Described CFB boiler furnace (1) is connected to respectively cyclone separator (2) and limestone calcination device (4) by flue; Cyclone separator (2) bottom is connected with burner hearth (1) through the feed back pipeline, and cyclone separator (2) top is connected to back-end ductwork (3) through flue; Agstone is delivered to limestone calcination device (4) through pulverized coal feed pipe, and limestone calcination device (4) bottom is connected with digester (9) by pulverized coal feed pipe; Limestone calcination device (4) top merges pipeline and is connected to air preheater (5), air preheater (5), pre-duster (6), SO again after flue is connected to the flue of by cyclone separator (2), being drawn ₂Absorber (7), sack cleaner (12) and chimney (13) are connected by flue successively; Pre-duster (6) is through ash conveying pipe and grey storehouse a(10) be connected, sack cleaner (12) is through ash conveying pipe and grey storehouse b(11) be connected; Digester (9) and SO ₂Absorber (7) connects through calcium hydroxide breast conveyance conduit, SO ₂Absorber (7) to the flow container that circulates (8) connects through pulverized coal feed pipe, and circulation flow container (8) is to SO ₂Absorber (7) connects by the desulfurizing agent circulating line; Sack cleaner (12) is to grey storehouse b(11) ash conveying pipe through circulating ash pipeline and SO ₂Absorber (7) to the pulverized coal feed pipe of the flow container that circulates (8) connects.