CN105289265A - Circulating fluidized bed boiler efficient wet process desulfurization process - Google Patents

Circulating fluidized bed boiler efficient wet process desulfurization process Download PDF

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Publication number
CN105289265A
CN105289265A CN201510659496.8A CN201510659496A CN105289265A CN 105289265 A CN105289265 A CN 105289265A CN 201510659496 A CN201510659496 A CN 201510659496A CN 105289265 A CN105289265 A CN 105289265A
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desulfurization
desulphurization circulating
tower
desulfuration
desulphurization
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郑贤设
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ANNADA TI IND Co Ltd ANHUI
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ANNADA TI IND Co Ltd ANHUI
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Abstract

The invention discloses a circulating fluidized bed boiler efficient wet process desulfurization process, which comprises the following steps that (1) carbide slag slurry crushed by a ball mill is used as a desulfurization absorber to be conveyed into a desulfurization circulation tank; (2) process water and the carbide slag slurry are injected into the desulfurization circulation tank to be mixed into desulfurization absorption liquid; (3) the desulfurization circulation tank and a desulfurization absorption tower are in separated arrangement, and a desulfurization circulation pump is started so that the desulfurization absorption liquid enters the desulfurization circulation pump through the desulfurization circulation tank and then forms the spray through a spray nozzle arranged in the spraying layer of the desulfurization tower; (4) a pH value detection instrument is used for detecting the pH value in the desulfurization circulation tank in real time, so that the pH value in the desulfurization circulation tank is 5.0 to 6.0; (5) when the liquid level of the desulfurization circulation tank is higher than 3.5m, the partial desulfurization absorption liquid is conveyed to a sewage treatment station through a slurry conveying pump; (6) when the smoke gas temperature in the desulfurization tower is higher than 60 DEG C, water is sprayed into the desulfurization absorption tower for temperature reduction, and the water spraying is stopped when the temperature is lowered to a value lower than 55 DEG C.

Description

A kind of high efficiency for circulating fluidized bed boiler wet desulfurizing process
Technical field
The present invention relates to industrial waste gas purifying field of Environment Protection, particularly relate to a kind of CFBB wet desulfurizing process.
Background technology
CFBB is as a kind of high-efficiency low-pollution Filter Tuber For Clean Coal burning boiler of novel maturation, high with its efficiency of combustion, and fuel tolerance is wide, and Load Regulation is flexible, and the advantages such as good environmental protection, are widely used.
Add the characteristic of calcium dry desulfurization in circulating fluid bed boiler, receive in today that environmental pollution is day by day serious the high praise done one's utmost especially, desulfuration efficiency can reach more than 85%, and operating cost is low, is a kind of environment-friendly boiler.But from the circulating fluid bed boiler desulfurization situation of actual operation of going into operation at present, desulfuration efficiency is still lower, generally in the majority about 70%, SO in the boiler smoke of discharge 2concentration is high, discharge capacity is large, does not reach the requirement of regulation in China's " emission standard of air pollutants for boilers " and " fossil-fuel power plant atmospheric pollutant emission standard ".Therefore, CFBB is extremely necessary to carry out secondary flue gas desulfurization after stove, the CFBB of the middle and high sulfur fuel that especially burns.
Dry desulfurizing process in circulating fluid bed boiler, with 0 ~ 1mm agstone for desulfurization absorbent, fuel and agstone are sent into from boiler furnace bottom, and First air is sent into from air distribution plate bottom, and Secondary Air is sent in the middle part of combustion chamber.When lime stone enters the scorching hot environment of CFB boiler, its active ingredient CaCO 3heat generation calcining and decomposing is CaO and CO 2, the SO that fuel combustion generates 2contact with CaO and chemical reaction occurs generate calcium sulfate and be removed.The chemical reaction that in stove, dry desulfurization is main is as follows:
CaCO 3=CaO+CO 2
CaO+SO 2+1/2O 2=CaSO 4
After circulating fluid bed boiler, flue gas desulfurization technique is generally Limestone-gypsum Wet Flue Gas Desulfurization Process, flue gas first after deduster dedusting, then bypass enter that wet desulphurization device carries out flue gas propose effect desulfurization.This technique adopts lime stone slaking liquid as SO 2absorbent, the SO in flue gas 2first be dissolved in absorbing liquid, be then dissociated into H +and HSO 3 -, reaction equation is as follows:
SO 2(gas)+H 2o → SO 2(liquid)+H 2o
SO 2(liquid)+H 2o → H ++ HSO 3 -→ 2H ++ SO 3 2-
Due to H +by OH -neutralization generates H 2o makes this balance carry out to the right, OH -ion is produced by the lime stone dissolved in water, and reaction equation is as follows:
CaO+H 2O→Ca(OH) 2
Ca(OH) 2+SO 2→CaSO 3+H 2O
CaSO 3+SO 2+H 2O→Ca(HSO 3) 2
CaSO 3the dissolving of lime stone can be accelerated.When the pH value of absorbing liquid controls lower (pH≤5.5), circulating absorption solution defines CaSO 3with Ca (HSO 3) 2mixture, this mixture exists with the character of buffer solution, make the pH value of absorption keep relatively steady.Fig. 1 of " carbide slag slurry the is used for boiler flue gas desulfurization " literary composition in " the nitrogenous fertilizer technology " of concrete desulphurization system of circulating fluidized bed boiler the 32nd volume the 1st phase in visible 2011.
In this stove, after dry desulfurization+stove, flue gas desulfurization course is loaded down with trivial details, expends raw material more, and cost is higher, and desulfuration efficiency is lower.
Summary of the invention
The technical problem to be solved in the present invention is that existing circulating fluid bed boiler desulfurization technical process is loaded down with trivial details, and expend raw material more, cost is higher, and desulfuration efficiency is lower, provides a kind of high efficiency for circulating fluidized bed boiler wet desulfurizing process for this reason.
Technical scheme of the present invention is: a kind of high efficiency for circulating fluidized bed boiler wet desulfurizing process, and it comprises the following steps: (1), be delivered in desulphurization circulating groove as desulfurization absorbent using the carbide slag slurry after being pulverized by ball mill; (2), desulfurization absorbing liquid is mixed into, until liquid level reaches 3.5m in desulphurization circulating groove to desulphurization circulating groove injection technology power and water rock ballast slurries; (3), starting desulfuration recycle pump makes desulfurization absorbing liquid form spraying by the nozzle in desulfurizing tower, by air-introduced machine, flue gas is sent in desulfuration absorbing tower, according to the desulfurization absorbing liquid internal circulating load of flue gas air inflow and desulfuration absorbing tower inlet and outlet pressure timely adjustment desulphurization circulating transport pump, desulfurization waste liquor enters Sewage Disposal, flue gas after desulfurization removes droplet through demister, through smoke stack emission; (4), with pH value detector detect the pH value in desulphurization circulating groove in real time, control to add carbide slag slurries liquid measure by electric control valve and make the pH value in desulphurization circulating groove be 5.0-6.0; (5), when desulphurization circulating tank liquor position is higher than 3.5m, by slurry feeding pump, partial desulfurization absorbing liquid is delivered to Sewage Disposal, when slurry feeding pump is closed higher than during 3.5m in desulphurization circulating tank liquor position; (6), as desulfurizing tower inside smoke temperature > 60 DEG C, spray cooling in desulfuration absorbing tower, stops water spray when equitemperature drops to < 55 DEG C.
Flue gas air inflow 60000-200000m in step described in such scheme (3) 3/ h, desulfurization absorbing liquid internal circulating load is 400-1000m 3/ h, desulfuration absorbing tower inlet and outlet pressure is 0.07-0.09Mpa.
The operating temperature of desulfuration absorbing tower described in such scheme controls at≤150 DEG C.
PH value in step described in such scheme (4) in desulphurization circulating groove is 5.5.
The invention has the beneficial effects as follows flue gas and desulfurization absorbing liquid making contact, through physical reactions such as absorption and sorptions, remove the dust in flue gas and sulfur dioxide simultaneously, meet environmental emission standard requirement; Desulfurizer therefor carbide slag abundance, with low cost; Adopt the design of efficient absorption tower simultaneously, there is low liquid-gas ratio, low internal circulating load feature, its desulfurizing agent and power consumption lower; Desulfurizing tower separates with circulating slot, avoids desulfurizing tower device bottom because of the blocking of material deposition, the equipment cycle of operation of prolongation; Desulfuration efficiency reaches more than 95%; Desulfurization product gypsum can be used as building material, non-secondary pollution, solves the problem of complex utilization of desulfurization product.
Detailed description of the invention
Below in conjunction with embodiment, the present invention will be further described.
The present invention includes following steps: (1), be delivered in desulphurization circulating groove as desulfurization absorbent using the carbide slag slurry after being pulverized by ball mill; (2), desulfurization absorbing liquid is mixed into, until liquid level reaches 3.5m in desulphurization circulating groove to desulphurization circulating groove injection technology power and water rock ballast slurries; (3), desulphurization circulating groove is separated setting with desulfuration absorbing tower, startup desulfuration recycle pump makes desulfurization absorbing liquid enter desulfuration recycle pump by desulphurization circulating groove and forms spraying by the nozzle in desulfurizing tower spraying layer again, by air-introduced machine, flue gas is sent in desulfuration absorbing tower, according to the desulfurization absorbing liquid internal circulating load of flue gas air inflow and desulfuration absorbing tower inlet and outlet pressure timely adjustment desulphurization circulating transport pump, desulfurization waste liquor enters Sewage Disposal, flue gas after desulfurization removes droplet through demister, through smoke stack emission; (4), with pH value detector detect the pH value in desulphurization circulating groove in real time, control to add carbide slag slurries liquid measure by electric control valve and make the pH value in desulphurization circulating groove be 5.0-6.0; (5), when desulphurization circulating tank liquor position is higher than 3.5m, by slurry feeding pump, partial desulfurization absorbing liquid is delivered to Sewage Disposal, when slurry feeding pump is closed higher than during 3.5m in desulphurization circulating tank liquor position; (6), as desulfurizing tower inside smoke temperature > 60 DEG C, spray cooling in desulfuration absorbing tower, stops water spray when equitemperature drops to < 55 DEG C.
This technique be adopt ball mill pulverize after carbide slag slurry as desulfurization absorbent, be delivered in desulphurization circulating groove.In desulfuration absorbing tower, carbide slag slurry mixes with smoke contacts, the SO in flue gas 2with the Ca (OH) in carbide slag slurry 2carry out chemical reaction absorbing and removing SO 2, desulfurization waste liquor enters the unified process of Sewage Disposal.Flue gas after desulfurization removes droplet through demister, through smoke stack emission.During actual motion, record into desulfurizing tower SO 2concentration is 1500mg/Nm 3(separate unit boiler), goes out desulfurizing tower SO 2concentration≤100mg/Nm 3, desulfuration efficiency reaches 95%.
Embodiment 1:(1), the carbide slag slurry after being pulverized by ball mill is delivered in desulphurization circulating groove as desulfurization absorbent; (2), desulfurization absorbing liquid is mixed into, until liquid level reaches 3.5m in desulphurization circulating groove to desulphurization circulating groove injection technology power and water rock ballast slurries; (3), desulphurization circulating groove is separated setting with desulfuration absorbing tower, startup desulfuration recycle pump makes desulfurization absorbing liquid enter desulfuration recycle pump by desulphurization circulating groove and forms spraying by the nozzle in desulfurizing tower spraying layer again, by air-introduced machine, flue gas is sent in desulfuration absorbing tower, according to the desulfurization absorbing liquid internal circulating load of flue gas air inflow and desulfuration absorbing tower inlet and outlet pressure timely adjustment desulphurization circulating transport pump, desulfurization waste liquor enters Sewage Disposal, flue gas after desulfurization removes droplet through demister, through smoke stack emission; (4), with pH value detector detect the pH value in desulphurization circulating groove in real time, control to add carbide slag slurries liquid measure by electric control valve and make the pH value in desulphurization circulating groove be 5.0; (5), when desulphurization circulating tank liquor position is higher than 3.5m, by slurry feeding pump, partial desulfurization absorbing liquid is delivered to Sewage Disposal, when slurry feeding pump is closed higher than during 3.5m in desulphurization circulating tank liquor position; (6), as desulfurizing tower inside smoke temperature > 60 DEG C, spray cooling in desulfuration absorbing tower, stops water spray when equitemperature drops to < 55 DEG C.
Embodiment: 2:(1), the carbide slag slurry after being pulverized by ball mill is delivered in desulphurization circulating groove as desulfurization absorbent; (2), desulfurization absorbing liquid is mixed into, until liquid level reaches 3.5m in desulphurization circulating groove to desulphurization circulating groove injection technology power and water rock ballast slurries; (3), desulphurization circulating groove is separated setting with desulfuration absorbing tower, startup desulfuration recycle pump makes desulfurization absorbing liquid enter desulfuration recycle pump by desulphurization circulating groove and forms spraying by the nozzle in desulfurizing tower spraying layer again, by air-introduced machine, flue gas is sent in desulfuration absorbing tower, according to the desulfurization absorbing liquid internal circulating load of flue gas air inflow and desulfuration absorbing tower inlet and outlet pressure timely adjustment desulphurization circulating transport pump, desulfurization waste liquor enters Sewage Disposal, flue gas after desulfurization removes droplet through demister, through smoke stack emission; (4), with pH value detector detect the pH value in desulphurization circulating groove in real time, control to add carbide slag slurries liquid measure by electric control valve and make the pH value in desulphurization circulating groove be 5.5; (5), when desulphurization circulating tank liquor position is higher than 3.5m, by slurry feeding pump, partial desulfurization absorbing liquid is delivered to Sewage Disposal, when slurry feeding pump is closed higher than during 3.5m in desulphurization circulating tank liquor position; (6), as desulfurizing tower inside smoke temperature > 60 DEG C, spray cooling in desulfuration absorbing tower, stops water spray during < 55 DEG C under equitemperature.
Embodiment 3:(1), the carbide slag slurry after being pulverized by ball mill is delivered in desulphurization circulating groove as desulfurization absorbent; (2), desulfurization absorbing liquid is mixed into, until liquid level reaches 3.5m in desulphurization circulating groove to desulphurization circulating groove injection technology power and water rock ballast slurries; (3), desulphurization circulating groove is separated setting with desulfuration absorbing tower, startup desulfuration recycle pump makes desulfurization absorbing liquid enter desulfuration recycle pump by desulphurization circulating groove and forms spraying by the nozzle in desulfurizing tower spraying layer again, by air-introduced machine, flue gas is sent in desulfuration absorbing tower, according to the desulfurization absorbing liquid internal circulating load of flue gas air inflow and desulfuration absorbing tower inlet and outlet pressure timely adjustment desulphurization circulating transport pump, desulfurization waste liquor enters Sewage Disposal, flue gas after desulfurization removes droplet through demister, through smoke stack emission; (4), with pH value detector detect the pH value in desulphurization circulating groove in real time, control to add carbide slag slurries liquid measure by electric control valve and make the pH value in desulphurization circulating groove be 6.0; (5), when desulphurization circulating tank liquor position is higher than 3.5m, by slurry feeding pump, partial desulfurization absorbing liquid is delivered to Sewage Disposal, when slurry feeding pump is closed higher than during 3.5m in desulphurization circulating tank liquor position; (6), as desulfurizing tower inside smoke temperature > 60 DEG C, spray cooling in desulfuration absorbing tower, stops water spray during equitemperature < 55 DEG C.
Preferred embodiment 4:(1), the carbide slag slurry after being pulverized by ball mill is delivered in desulphurization circulating groove as desulfurization absorbent; (2), desulfurization absorbing liquid is mixed into, until liquid level reaches 3.5m in desulphurization circulating groove to desulphurization circulating groove injection technology power and water rock ballast slurries; (3), desulphurization circulating groove is separated setting with desulfuration absorbing tower, startup desulfuration recycle pump makes desulfurization absorbing liquid enter desulfuration recycle pump by desulphurization circulating groove and forms spraying by the nozzle in desulfurizing tower spraying layer again, by air-introduced machine, flue gas is sent in desulfuration absorbing tower, flue gas air inflow 60000m 3/ h, desulfurization absorbing liquid internal circulating load is 400m 3/ h, desulfuration absorbing tower inlet and outlet pressure is 0.07Mpa, and desulfuration absorbing tower operating temperature controls at≤150 DEG C, and desulfurization waste liquor enters Sewage Disposal, and the flue gas after desulfurization removes droplet through demister, through smoke stack emission; (4), with pH value detector detect the pH value in desulphurization circulating groove in real time, control to add carbide slag slurries liquid measure by electric control valve and make the pH value in desulphurization circulating groove be 5.5; (5), when desulphurization circulating tank liquor position is higher than 3.5m, by slurry feeding pump, partial desulfurization absorbing liquid is delivered to Sewage Disposal, when slurry feeding pump is closed higher than during 3.5m in desulphurization circulating tank liquor position; (6), as desulfurizing tower inside smoke temperature > 60 DEG C, spray cooling in desulfuration absorbing tower, stops water spray during equitemperature < 55 DEG C.
Preferred embodiment 5:(1), the carbide slag slurry after being pulverized by ball mill is delivered in desulphurization circulating groove as desulfurization absorbent; (2), desulfurization absorbing liquid is mixed into, until liquid level reaches 3.5m in desulphurization circulating groove to desulphurization circulating groove injection technology power and water rock ballast slurries; (3), desulphurization circulating groove is separated setting with desulfuration absorbing tower, startup desulfuration recycle pump makes desulfurization absorbing liquid enter desulfuration recycle pump by desulphurization circulating groove and forms spraying by the nozzle in desulfurizing tower spraying layer again, by air-introduced machine, flue gas is sent in desulfuration absorbing tower, flue gas air inflow 100000m 3/ h, desulfurization absorbing liquid internal circulating load is 600m 3/ h, desulfuration absorbing tower inlet and outlet pressure is 0.08Mpa, and desulfuration absorbing tower operating temperature controls at≤150 DEG C, and desulfurization waste liquor enters Sewage Disposal, and the flue gas after desulfurization removes droplet through demister, through smoke stack emission; (4), with pH value detector detect the pH value in desulphurization circulating groove in real time, control to add carbide slag slurries liquid measure by electric control valve and make the pH value in desulphurization circulating groove be 5.5; (5), when desulphurization circulating tank liquor position is higher than 3.5m, by slurry feeding pump, partial desulfurization absorbing liquid is delivered to Sewage Disposal, when slurry feeding pump is closed higher than during 3.5m in desulphurization circulating tank liquor position; (6), as desulfurizing tower inside smoke temperature > 60 DEG C, spray cooling in desulfuration absorbing tower, stops water spray during equitemperature < 55 DEG C.
Preferred embodiment 6:(1), the carbide slag slurry after being pulverized by ball mill is delivered in desulphurization circulating groove as desulfurization absorbent; (2), desulfurization absorbing liquid is mixed into, until liquid level reaches 3.5m in desulphurization circulating groove to desulphurization circulating groove injection technology power and water rock ballast slurries; (3), desulphurization circulating groove is separated setting with desulfuration absorbing tower, startup desulfuration recycle pump makes desulfurization absorbing liquid enter desulfuration recycle pump by desulphurization circulating groove and forms spraying by the nozzle in desulfurizing tower spraying layer again, by air-introduced machine, flue gas is sent in desulfuration absorbing tower, flue gas air inflow 200000m 3/ h, desulfurization absorbing liquid internal circulating load is 1000m 3/ h, desulfuration absorbing tower inlet and outlet pressure is 0.09Mpa, and desulfuration absorbing tower operating temperature controls at≤150 DEG C, and desulfurization waste liquor enters Sewage Disposal, and the flue gas after desulfurization removes droplet through demister, through smoke stack emission; (4), with pH value detector detect the pH value in desulphurization circulating groove in real time, control to add carbide slag slurries liquid measure by electric control valve and make the pH value in desulphurization circulating groove be 5.5; (5), when desulphurization circulating tank liquor position is higher than 3.5m, by slurry feeding pump, partial desulfurization absorbing liquid is delivered to Sewage Disposal, when slurry feeding pump is closed higher than during 3.5m in desulphurization circulating tank liquor position; (6), as desulfurizing tower inside smoke temperature > 60 DEG C, spray cooling in desulfuration absorbing tower, stops water spray during equitemperature < 55 DEG C.
Desulfuration absorbing tower inside smoke temperature controls, between 55-60 DEG C, can ensure high and stable desulfuration efficiency.
Research finds, as flue gas air inflow 60000-200000m in step (3) 3/ h, desulfurization absorbing liquid internal circulating load is 400-1000m 3/ h, desulfuration absorbing tower inlet and outlet pressure is 0.07-0.09Mpa, desulfuration absorbing tower operating temperature controls ,≤150 DEG C time, can improve desulfuration efficiency to 96-97%, simultaneously sorbent consumption and power consumption lower.
Conventional wet sulfur removal technology, desulfuration absorbing tower and desulphurization circulating groove are integrated, longtime running, desulfuration absorbing tower bottom slurry deposition is serious, the equipment cycle of operation is short, this technique desulfuration absorbing tower separates with desulphurization circulating groove, avoids desulfuration absorbing tower device bottom because of the blocking of material deposition, the equipment cycle of operation of prolongation.

Claims (4)

1. a high efficiency for circulating fluidized bed boiler wet desulfurizing process, is characterized in that it comprises the following steps: (1), be delivered in desulphurization circulating groove as desulfurization absorbent using the carbide slag slurry after being pulverized by ball mill; (2), desulfurization absorbing liquid is mixed into, until liquid level reaches 3.5m in desulphurization circulating groove to desulphurization circulating groove injection technology power and water rock ballast slurries; (3), desulphurization circulating groove is separated setting with desulfuration absorbing tower, startup desulfuration recycle pump makes desulfurization absorbing liquid enter desulfuration recycle pump by desulphurization circulating groove and forms spraying by the nozzle in desulfurizing tower spraying layer again, by air-introduced machine, flue gas is sent in desulfuration absorbing tower, according to the desulfurization absorbing liquid internal circulating load of flue gas air inflow and desulfuration absorbing tower inlet and outlet pressure timely adjustment desulphurization circulating transport pump, desulfurization waste liquor enters Sewage Disposal, flue gas after desulfurization removes droplet through demister, through smoke stack emission; (4), with pH value detector detect the pH value in desulphurization circulating groove in real time, control to add carbide slag slurries liquid measure by electric control valve and make the pH value in desulphurization circulating groove be 5.0-6.0; (5), when desulphurization circulating tank liquor position is higher than 3.5m, by slurry feeding pump, partial desulfurization absorbing liquid is delivered to Sewage Disposal, when slurry feeding pump is closed higher than during 3.5m in desulphurization circulating tank liquor position; (6), as desulfurizing tower inside smoke temperature > 60 DEG C, spray cooling in desulfuration absorbing tower, stops water spray when equitemperature drops to < 55 DEG C.
2. a kind of high efficiency for circulating fluidized bed boiler wet desulfurizing process as claimed in claim 1, is characterized in that flue gas air inflow 60000-200000m in described step (3) 3/ h, desulfurization absorbing liquid internal circulating load is 400-1000m 3/ h, desulfuration absorbing tower inlet and outlet pressure is 0.07-0.09Mpa.
3. a kind of high efficiency for circulating fluidized bed boiler wet desulfurizing process as claimed in claim 2, is characterized in that described desulfuration absorbing tower operating temperature controls at≤150 DEG C.
4. a kind of high efficiency for circulating fluidized bed boiler wet desulfurizing process as claimed in claim 3, is characterized in that the pH value in described step (4) in desulphurization circulating groove is 5.5.
CN201510659496.8A 2015-10-14 2015-10-14 Circulating fluidized bed boiler efficient wet process desulfurization process Pending CN105289265A (en)

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CN112546834A (en) * 2020-05-21 2021-03-26 河南亿水源净水材料科技有限公司 Method for desulfurizing by using industrial waste residues

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Application publication date: 20160203