CN114646067A - Desulfurization treatment process for combustion application of furfural residues - Google Patents

Desulfurization treatment process for combustion application of furfural residues Download PDF

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Publication number
CN114646067A
CN114646067A CN202210310200.1A CN202210310200A CN114646067A CN 114646067 A CN114646067 A CN 114646067A CN 202210310200 A CN202210310200 A CN 202210310200A CN 114646067 A CN114646067 A CN 114646067A
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desulfurization
combustion
sulfur
furfural
flue gas
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Chinese (zh)
Inventor
王志强
樊峰鸣
吴永铃
盛谦益
周冬颖
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Beijing Aoke Ruifeng New Energy Co ltd
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Beijing Aoke Ruifeng New Energy Co ltd
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Priority to CN202210310200.1A priority Critical patent/CN114646067A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/02—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of bagasse, megasse or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/96—Regeneration, reactivation or recycling of reactants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/003—Arrangements of devices for treating smoke or fumes for supplying chemicals to fumes, e.g. using injection devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00—Preventing emissions
    • F23J2215/20—Sulfur; Compounds thereof

Abstract

The invention provides a desulfurization treatment process for combustion application of furfural residues. The invention utilizes the calcium-based composite sulfur-fixing agent, can improve the reaction efficiency and enhance the sulfur-fixing effect through the micropore structure, wherein the additive and the decomposition inhibitor improve the thermal stability of micropores, inhibit the decomposition of solid sulfur-fixing products at high temperature, monitor and control the combustion reaction temperature in the combustion process, and retain the sulfur-containing components in the furfural residues in the solid residues after combustion. Spraying through preliminary and deepening second grade desulfurization, adopting the ph value of differentiation, making the desulfurization reaction more optimize, obtain higher desulfurization efficiency, wherein preliminary desulfurization adopts lower ph value, realizes the neutralization to acid component in the furfural sediment flue gas, also can avoid excessive scale deposit simultaneously, has realized the zero release of sulfur element in the furfural sediment burning flue gas basically through above technology.

Description

Desulfurization treatment process for combustion application of furfural residues
Technical Field
The invention relates to the technical field of biomass combustion, in particular to a desulfurization treatment process applied to combustion of furfural residues.
Background
Furfural is a widely used basic chemical raw material, and can be used for synthesizing a series of important chemical products such as furfuryl alcohol, furan, furoic acid ethyl ester, succinic acid and the like. At present, furfural cannot be prepared through synthesis, but is prepared through hydrolysis of hemicellulose-containing biomass under the catalytic action of acid. Generally, biomass materials such as corn cobs, corn stover, bagasse and the like are used as raw materials for furfural production.
After the biomass raw material is used for preparing furfural, more organic residues are remained, and are generally called furfural residues. The furfural residue is dark brown generally, and is in a yellow brown soft powder shape after being dried, the particle size of the particles is about 1-2 mm, and the components of the furfural residue are mainly various organic matters.
The weight ratio of the furfural production to the furfural residues is generally about 1:15, and the furfural residues remained in the furfural production are estimated to be more than millions of tons every year in China, so that the furfural residues are an important available resource. At present, the furfural residue is used as boiler fuel to provide heat energy, and it is estimated that the heat generated by combusting furfural residue by a boiler for 3 tons is equivalent to 1 ton of standard coal. Therefore, the furfural residue as a fuel has the effects of reducing fossil energy consumption and promoting saving and environmental protection.
The furfural residue is directly used for combustion, and sulfur dioxide (SO) in the generated flue gas2) The content is high, and pollution is easy to cause, so the desulfurization treatment process has important significance for the application of the furfural residue as fuel. At present, the desulfurization treatment process of furfural residue combustion mainly adopts the desulfurization treatment of coal. However, the desulfurization treatment process of coal cannot adapt to the problems of complicated organic matter components, large moisture content, low smoke discharge temperature and the like of furfural residue combustion smoke,The equipment has strong corrosiveness, so that a good desulfurization effect cannot be obtained.
Disclosure of Invention
In view of the above problems, it is an object of the present invention to provide a desulfurization treatment process for application to combustion of furfural residues.
The desulfurization treatment process facing combustion application of the furfural residues, provided by the embodiment of the invention, comprises the following steps:
a sulfur fixation combustion step, namely adding a sulfur fixation agent into the furfural residue, then combusting, and monitoring and controlling the combustion reaction temperature in the combustion process;
a dust removal step, which is used for removing dust from flue gas generated by combustion of furfural residues;
a preliminary spraying desulfurization step, namely inputting the dedusted flue gas into desulfurization spraying equipment, and spraying the flue gas by using desulfurized lime slurry to realize preliminary desulfurization;
a deepening spray desulfurization step, namely inputting the flue gas subjected to primary spray desulfurization into secondary spray equipment, and carrying out deepening spray desulfurization by utilizing desulfurized lime slurry;
and a demisting and purifying step, namely demisting the flue gas subjected to preliminary spraying and deepening spraying desulfurization by a multi-stage demister to remove suspended micro liquid drops in the flue gas.
Preferably, the sulfur fixing agent added in the sulfur fixing combustion step is a calcium-based composite sulfur fixing agent.
Preferably, the sulfur-fixing agent in the sulfur-fixing combustion step comprises Ca (OH)2And an additive, wherein the additive adopts Ba (OH)2、KOH、Na2CO3Any one of the above; the Ca (OH)297.5-99 parts by weight of the additive, and 2.5-1 part by weight of the additive.
Preferably, the sulfur-fixing agent in the sulfur-fixing combustion step further comprises a decomposition inhibitor, and the decomposition inhibitor adopts Al2O3The addition amount is 2-3 parts by weight.
Preferably, the furfural residue and the sulfur-fixing agent are fully mixed and then ground into fine particles with the particle size of 0.1 mm.
Preferably, the temperature of the combustion reaction is monitored and controlled to be 840 ℃ and 900 ℃ in the sulfur-fixing combustion step.
Preferably, the flow rate of flue gas in the primary spray desulfurization step is controlled to be 1.5 x 104-2.5*104m3And/min, controlling the spraying amount to be 18-19.5 of gas-liquid volume ratio, and controlling the pH value of the desulfurized lime slurry to be 4.2-5.2.
Preferably, the pH value of the lime slurry in the deepening spray desulfurization step is controlled to be 5.5-5.8.
Preferably, the desulfurization treatment process further comprises: and a desulfurizer blending step, namely, utilizing lime powder and gypsum dehydration filtrate to prepare desulfurized lime slurry adopted in the preliminary spray desulfurization step, wherein the pH value of the desulfurized lime slurry is controlled to be 4.2-5.2.
Preferably, the desulfurization treatment process further comprises: a desulfurizing agent circulating step, namely introducing compressed air into the slurry in a slurry tank at the bottom of spraying equipment for primary spray desulfurization and deepened spray desulfurization, and carrying out oxidation reaction with the slurry by stirring to generate gypsum slurry; pumping out the gypsum slurry by a gypsum pump, and dehydrating to produce gypsum; the gypsum dehydration filtrate is transported by a pipeline to be used for the step of blending the desulfurizer.
Therefore, the invention provides a desulfurization treatment process applied to combustion of furfural residues. The process utilizes the calcium-based composite sulfur-fixing agent, can improve the reaction efficiency and enhance the sulfur-fixing effect through the micropore structure, wherein the additive and the decomposition inhibitor improve the thermal stability of micropores, inhibit the decomposition of solid sulfur-fixing products at high temperature, monitor and control the combustion reaction temperature in the combustion process, and retain the sulfur-containing components in the furfural residues in the solid residues after combustion. Spraying through preliminary and deepening second grade desulfurization, adopting the ph value of differentiation, making the desulfurization reaction more optimize, obtain higher desulfurization efficiency, wherein preliminary desulfurization adopts lower ph value, realizes the neutralization to acid component in the furfural sediment flue gas, also can avoid excessive scale deposit simultaneously, has realized the zero release of sulfur element in the furfural sediment burning flue gas basically through above technology.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a flow chart of a desulfurization treatment process facing combustion application of furfural residue according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Referring to fig. 1, the present invention provides a desulfurization treatment process for combustion application of furfural residues. The process steps of this example are explained below.
And a sulfur fixation combustion step, namely adding a sulfur fixation agent into the furfural residue, then, performing combustion, monitoring and controlling the combustion reaction temperature in the combustion process, and keeping the sulfur-containing components in the furfural residue in the solid residue after combustion. Through this step, can reduce the sulphur content in the emission flue gas from the source.
In the step, the adopted sulfur-fixing agent is a calcium-based composite sulfur-fixing agent. The sulfur-fixing agent is added in such an amount that the molar ratio of Ca to S elements after addition is 3 to 4.5, preferably 3.8. Preferably, the method comprises the following steps of Ca (OH)2And an additive. Wherein, the Ca (OH)297.5-99 parts by weight of the additive, and 2.5-1 part by weight of the additive. The additive adopts Ba (OH)2、KOH、Na2CO3Any one of them. Furthermore, the compound sulfur-fixing agent also comprises a decomposition inhibitor. The decomposition inhibitor is Al2O3. The addition amount of the decomposition inhibitor is 2 to 3 parts by weight.
In the step, the furfural residues and the sulfur fixing agent are fully mixed, ground and crushed into fine particles with the particle size of 0.1mm, and then sent into a furfural residue combustion furnace for combustion.
In the combustion process of the step, the first-stage chemical reaction is Ca (OH) when the temperature reaches more than 450 DEG C2→CaO+H2O。Ca(OH)2The dehydration decomposition generates CaO particle morphology rich in micropores and has higher specific surface area, so that SiO2To diffuse into the pores of the CaO such that the second stage sulfur fixation reaction can be performed simultaneously on the outer surface of the particle and inside the pores. The second stage chemical reaction is CaO + SiO2+1/2O2→CaSO4Formation of elemental sulphur as CaSO in solid form4To fix sulfur, due to the porous form of CaO, CaSO4Can grow on the outer surface of CaO particles and the inner part of micropores together, and improves the sulfur fixation efficiency. Said additive Ba (OH)2KOH or Na2CO3Can improve the thermal stability of CaO, maintain the microporous form of CaO from being damaged, improve the sulfur fixation reactivity and increase the utilization rate of Ca element. Decomposition inhibitor Al2O3Can inhibit the reaction product CaSO in the second stage4Thermal decomposition of (2); moreover, the sintering resistance of CaO can be improved, and the maintenance of the microporous morphology can be facilitated.
In the combustion process of the step, experiments show that the effect of the second-stage sulfur fixation reaction is obviously influenced by the combustion temperature. On one hand, along with the rise of the combustion temperature, the decomposition and release of organic matters in the furfural residues are more sufficient, so that SiO in the flue gas is generated2The content is increased, on the other hand, the temperature of over 800 ℃ is needed for maintaining the sulfur fixing reaction of CaO, the efficiency of the sulfur fixing reaction is improved as the temperature continues to increase, but the temperature is increased to the temperatureThe desulfurization effect of CaO is weakened to a certain degree; the inflection point of the sulfur-fixing reaction efficiency along with the temperature change also has distribution difference with different additives, but generally does not exceed 1050 ℃. Therefore, the temperature of the monitoring and controlling combustion reaction is kept in the temperature interval of 800-1050 ℃ during the combustion process. The combustion reaction temperature is preferably 840-900 ℃, and most preferably 860-890 ℃, and the decomposition release degree of sulfur in the furfural residues can be relieved within the temperature range, and meanwhile, the sulfur fixation reaction of CaO and additives thereof is kept at high efficiency.
And a dust removal step, wherein dust is removed from flue gas generated by combustion of the furfural residues. The step can adopt any one or combination of means such as cyclone dust removal, electrostatic dust removal, filter bag dust removal and the like to remove particulate matter dust in the flue gas. Preferably, a dust removal mode combining cyclone dust removal and filter bag dust removal can be adopted. The experimental removal of the dust is not only beneficial to the purification of the flue gas, but also can reduce the dust amount mixed into the desulfurizer in the subsequent spray desulfurization link, avoid the phenomena of foaming, overflowing, blocking and the like, and is beneficial to the circulation of the desulfurizer.
And a preliminary spraying and desulfurizing step, namely inputting the dedusted flue gas into desulfurization spraying equipment to spray desulfurized lime slurry, so as to realize preliminary desulfurization and play a role in reducing the temperature of the flue gas and neutralizing acidic components. In the step, the air inlet speed and the liquid-gas ratio of the flue gas are adjusted, and the flow rate of the flue gas is controlled to be 1.5 x 104-2.5*104m3And/min, controlling the spraying amount to be 18-19.5 of the volume ratio of gas to liquid, thereby ensuring uniform gas-liquid mixing, increasing the circulating flow of the flue gas in the spraying equipment and ensuring the contact of the desulfurized lime slurry and the flue gas so as to facilitate desulfurization and cooling. And through a desulfurizer blending step, lime powder and gypsum dehydration filtrate are utilized to prepare desulfurized lime slurry adopted in the preliminary spray desulfurization step, and the pH value of the desulfurized lime slurry is controlled to be 4.2-5.2, preferably 4.8. Because organic matters are decomposed in the combustion process of the furfural residues, the flue gas contains more acidic components such as hydrochloric acid, acetic acid steam and the like, and the corrosion is brought to equipment, the pH value of the lime slurry in the primary spraying desulfurization step is lower than that of the lime slurry set by the common desulfurization process, and the purpose of realizing the acidic component decomposition of the furfural residues is realizedThe components are neutralized, and excessive scaling can be avoided. The mass concentration of the prepared lime slurry is 30-35%.
And a deepening spraying desulfurization step, namely inputting the flue gas subjected to primary spraying desulfurization into secondary spraying equipment, and carrying out deepening spraying desulfurization by utilizing the desulfurized lime slurry, so that the sulfur content in the flue gas is further reduced. The pH value of the lime slurry used in the step of deepening spray desulfurization is higher than that of the lime slurry used in the step of preliminary spray desulfurization and is controlled to be 5.5-5.8. Therefore, the desulfurization reaction can be optimized and higher desulfurization efficiency can be obtained through the common two-stage spraying operation of differentiating the ph value. The flue gas air inlet speed and the liquid-gas ratio in the deepening spraying desulfurization step are the same as those in the preliminary spraying desulfurization step.
And a demisting and purifying step, namely demisting the flue gas subjected to preliminary spraying and deepening spraying desulfurization by a multistage demister to remove suspended micro liquid drops in the flue gas.
The desulfurization treatment process also comprises a desulfurizer circulating step, wherein compressed air is introduced into the slurry in a slurry tank at the bottom of the spraying equipment for primary spray desulfurization and deepened spray desulfurization, and the slurry are subjected to oxidation reaction through stirring to generate gypsum slurry; pumping out the gypsum slurry by a gypsum pump, and dehydrating to produce gypsum; the gypsum dehydration filtrate is transported by a pipeline to be used for the step of blending the desulfurizer.
The following are descriptions of specific steps of examples 1 to 3, which were carried out according to the desulfurization treatment process of the present invention, and desulfurization effect data.
Example 1:
adding Ca (OH) into furfural residue fuel2、Ba(OH)2、Al2O3The formed composite sulfur-fixing agent contains Ca (OH)2In a ratio of 97.5 parts by weight, Ba (OH)22.5 parts by weight of Al2O33 parts by weight. And the adding amount of the composite sulfur-fixing agent is adjusted according to the content of sulfur element detected in the furfural residue fuel sample, so that the molar ratio of Ca to S is 3.8. Fully mixing the furfural residue and the sulfur-fixing agent, grinding and crushing the mixture to fine particles with the particle size of 0.1mm, and then sending the fine particles into a furfural residue combustion furnace for combustion, wherein the combustion temperature is controlled to be 870 degrees centigrade.
And dedusting the flue gas generated by combustion of the furfural residues by adopting a dedusting mode combining cyclone dedusting and filter bag dedusting.
Inputting the dedusted flue gas into desulfurization spraying equipment for preliminary spraying desulfurization, and spraying desulfurized lime slurry; the flow rate of flue gas is controlled to be 2.0m3And/min, controlling the spraying amount to be 19 in gas-liquid volume ratio, adjusting the pH value of the desulfurized lime slurry to be 4.8 and adjusting the concentration of the lime slurry to be 33 percent.
Inputting the flue gas subjected to primary spray desulfurization into secondary spray equipment, and performing deep spray desulfurization by using desulfurized lime slurry, wherein the flow rate of the flue gas is controlled to be 2.0m3And/min, controlling the spraying amount to be 19 in gas-liquid volume ratio, and controlling the pH value of the used lime slurry to be 5.8.
And demisting the flue gas subjected to preliminary spraying and deepened spraying desulfurization by a multi-stage demister, and removing suspended micro liquid drops in the flue gas.
Introducing compressed air into the slurry in a slurry pool at the bottom of the spraying equipment for preliminary spray desulfurization and deepened spray desulfurization, and stirring the slurry to perform oxidation reaction with the slurry to generate gypsum slurry; pumping out the gypsum slurry by a gypsum pump, and dehydrating to produce gypsum. The gypsum dehydration filtrate is transported by a pipeline for blending a desulfurizer.
Example 2
Adding Ca (OH) into furfural residue fuel2、KOH、Al2O3The formed composite sulfur-fixing agent contains Ca (OH)298.5 weight portions of KOH1.5 weight portions of Al2O32 parts by weight. And the adding amount of the composite sulfur-fixing agent is adjusted according to the content of sulfur elements detected in the furfural residue fuel sample, so that the molar ratio of Ca to S elements is 3. And (3) fully mixing the furfural residues and the sulfur fixing agent, grinding and crushing the mixture into fine particles with the particle size of 0.1mm, and then sending the fine particles into a furfural residue combustion furnace for combustion, wherein the combustion temperature is controlled at 890 ℃.
And dedusting the flue gas generated by combustion of the furfural residues by adopting a dedusting mode combining cyclone dedusting and filter bag dedusting.
Inputting the flue gas after dust removal into a dehydratorThe sulfur spraying equipment is used for carrying out preliminary spraying desulfurization, and desulfurized lime slurry is used for spraying; the flow rate of flue gas is controlled to be 2.5m3And/min, controlling the spraying amount to be 18 in gas-liquid volume ratio, adjusting the pH value of the desulfurized lime slurry to be 4.2 and adjusting the concentration of the lime slurry to be 30 percent.
Inputting the flue gas subjected to primary spray desulfurization into secondary spray equipment, and performing deep spray desulfurization by using desulfurized lime slurry, wherein the flow rate of the flue gas is controlled to be 2.5m3And/min, controlling the spraying amount to be 18 in gas-liquid volume ratio, and controlling the pH value of the used lime slurry to be 5.5.
And demisting the flue gas subjected to preliminary spraying and deepened spraying desulfurization by a multi-stage demister, and removing suspended micro liquid drops in the flue gas.
Introducing compressed air into the slurry in a slurry tank at the bottom of spraying equipment for preliminary spray desulfurization and deepened spray desulfurization, and carrying out oxidation reaction with the slurry by stirring to generate gypsum slurry; pumping out the gypsum slurry by a gypsum pump, and dehydrating to produce gypsum. The gypsum dehydration filtrate is transported by a pipeline for blending a desulfurizer.
Example 3
Adding Ca (OH) into furfural residue fuel2、Na2CO3、Al2O3The formed composite sulfur-fixing agent contains Ca (OH)299 weight portions of KOH1 weight portions of Al2O32 parts by weight. And the adding amount of the composite sulfur-fixing agent is adjusted according to the content of sulfur element detected in the furfural residue fuel sample, so that the molar ratio of Ca to S elements is 2.5. And fully mixing the furfural residues and the sulfur fixing agent, grinding and crushing the mixture into fine particles with the particle size of 0.1mm, and then sending the fine particles into a furfural residue combustion furnace for combustion, wherein the combustion temperature is controlled at 850 ℃.
And dedusting the flue gas generated by combustion of the furfural residues by adopting a dedusting mode combining cyclone dedusting and filter bag dedusting.
Inputting the dedusted flue gas into desulfurization spraying equipment for preliminary spraying desulfurization, and spraying desulfurized lime slurry; the flow rate of flue gas is controlled to be 1.5m3Min, controlling the spraying amount to be 19.5 of gas-liquid volume ratio, and adjusting the pH value of the desulfurized lime slurryThe formulation is 5.2, and the concentration of lime slurry is 35%.
Inputting the flue gas subjected to primary spray desulfurization into secondary spray equipment, and performing deep spray desulfurization by using desulfurized lime slurry, wherein the flow rate of the flue gas is controlled to be 1.5m3And/min, controlling the spraying amount to be 19.5 in gas-liquid volume ratio, and controlling the pH value of the used lime slurry to be 5.8.
And demisting the flue gas subjected to preliminary spraying and deepening spraying desulfurization by a multistage demister to remove suspended micro liquid drops in the flue gas.
Introducing compressed air into the slurry in a slurry tank at the bottom of spraying equipment for preliminary spray desulfurization and deepened spray desulfurization, and carrying out oxidation reaction with the slurry by stirring to generate gypsum slurry; pumping out the gypsum slurry by a gypsum pump, and dehydrating to produce gypsum. The gypsum dehydration filtrate is transported by a pipeline to be used for the blending of a desulfurizer.
Through detection, the furfural residue fuel of the same batch is combusted at the combustion temperature of 1050 ℃ without adding a sulfur fixing agent and is not subjected to desulfurization treatment, and the mass fraction of sulfur elements in the flue gas is averagely 1.58% (determined by using a KZDL-3B type intelligent sulfur determinator). In example 1, the mass fraction of sulfur in the combustion flue gas of furfural residue was 1.06%, and the mass fraction of sulfur in the flue gas after the primary spray desulfurization, the deepened spray desulfurization, and the defogging purification was less than 0.01%. In example 2, the mass fraction of sulfur in the combustion flue gas of furfural residue is 1.11%, and the mass fraction of sulfur in the flue gas after the primary spray desulfurization treatment, the deepened spray desulfurization and the defogging purification treatment is lower than 0.01%. In example 3, the mass fraction of sulfur in the combustion flue gas of furfural residue was 1.08%, and the mass fraction of sulfur in the flue gas after the primary spray desulfurization, the deepened spray desulfurization, and the defogging purification was less than 0.01%. Examples 1-3 have achieved substantially zero emission.
The process utilizes the calcium-based composite sulfur-fixing agent, can improve the reaction efficiency and enhance the sulfur-fixing effect through the micropore structure, wherein the additive and the decomposition inhibitor improve the thermal stability of micropores, inhibit the decomposition of solid sulfur-fixing products at high temperature, monitor and control the combustion reaction temperature in the combustion process, and retain the sulfur-containing components in the furfural residues in the solid residues after combustion. Spraying through preliminary and deepening second grade desulfurization, adopting the ph value of differentiation, making the desulfurization reaction more optimized, obtain higher desulfurization efficiency, wherein preliminary desulfurization adopts lower ph value, realizes the neutralization to acid component in the furfural sediment flue gas, also can avoid excessive scale deposit simultaneously, has realized the zero release of sulfur element in the furfural sediment burning flue gas basically through above technology.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. A desulfurization treatment process facing combustion application of furfural residues is characterized by comprising the following steps of:
a sulfur fixation combustion step, namely adding a sulfur fixation agent into the furfural residue, then combusting, and monitoring and controlling the combustion reaction temperature in the combustion process;
a dust removal step, which is used for removing dust from flue gas generated by combustion of furfural residues;
a preliminary spraying and desulfurizing step, namely inputting the dedusted flue gas into desulfurization spraying equipment to spray desulfurized lime slurry to realize preliminary desulfurization;
a deepened spraying desulfurization step, namely inputting the flue gas subjected to primary spraying desulfurization into secondary spraying equipment, and carrying out deepened spraying desulfurization by using desulfurized lime slurry;
and a demisting and purifying step, namely demisting the flue gas subjected to preliminary spraying and deepening spraying desulfurization by a multistage demister to remove suspended micro liquid drops in the flue gas.
2. The desulfurization treatment process facing combustion application of furfural residues as set forth in claim 1, wherein the sulfur fixing agent added in the sulfur-fixing combustion step is a calcium-based composite sulfur fixing agent.
3. According to claim2, the desulfurization treatment process facing the combustion application of the furfural residues is characterized in that in the step of sulfur fixation combustion, a sulfur fixation agent comprises Ca (OH)2And an additive, wherein the additive adopts Ba (OH)2、KOH、Na2CO3Any one of the above; the Ca (OH)297.5-99 parts by weight of the additive, and 2.5-1 part by weight of the additive.
4. The desulfurization treatment process facing combustion application of furfural residues as set forth in claim 3, wherein the sulfur-fixing agent in the sulfur-fixing combustion step further comprises a decomposition inhibitor, and the decomposition inhibitor adopts Al2O3The addition amount is 2-3 weight parts.
5. The desulfurization treatment process facing combustion application of furfural residues as set forth in claim 4, wherein the furfural residues and the sulfur-fixing agent are ground and pulverized into fine particles having a particle size of 0.1mm after being sufficiently mixed.
6. The desulfurization treatment process facing combustion application of furfural residue as set forth in claim 5, wherein the temperature of the combustion reaction is monitored and controlled to be 840-900 ℃ in the step of sulfur fixation combustion.
7. The desulfurization treatment process facing combustion application of furfural residues as set forth in claim 5, characterized in that the flue gas flow rate in the preliminary spray desulfurization step is controlled at 1.5 x 104-2.5*104m3And/min, controlling the spraying amount to be 18-19.5 of gas-liquid volume ratio, and controlling the pH value of the desulfurized lime slurry to be 4.2-5.2.
8. The desulfurization treatment process facing the combustion application of furfural residues as set forth in claim 7, characterized in that the ph of the lime slurry in the advanced spray desulfurization step is controlled to 5.5 to 5.8.
9. The desulfurization treatment process facing combustion application of furfural residue according to claim 8, further comprising: and a desulfurizer blending step, namely, utilizing lime powder and gypsum dehydration filtrate to prepare desulfurized lime slurry adopted in the preliminary spray desulfurization step, wherein the pH value of the desulfurized lime slurry is controlled to be 4.2-5.2.
10. The desulfurization treatment process facing combustion application of furfural residue according to claim 9, further comprising: a desulfurizing agent circulating step, namely introducing compressed air into the slurry in a slurry tank at the bottom of spraying equipment for primary spray desulfurization and deepened spray desulfurization, and carrying out oxidation reaction with the slurry by stirring to generate gypsum slurry; pumping out the gypsum slurry by a gypsum pump, and dehydrating to produce gypsum; the gypsum dehydration filtrate is transported by a pipeline to be used for the step of blending the desulfurizer.
CN202210310200.1A 2022-03-28 2022-03-28 Desulfurization treatment process for combustion application of furfural residues Pending CN114646067A (en)

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