CN210905618U - Flue gas purification treatment equipment - Google Patents
Flue gas purification treatment equipment Download PDFInfo
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- CN210905618U CN210905618U CN201920839595.8U CN201920839595U CN210905618U CN 210905618 U CN210905618 U CN 210905618U CN 201920839595 U CN201920839595 U CN 201920839595U CN 210905618 U CN210905618 U CN 210905618U
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Abstract
The utility model discloses a flue gas purification treatment facility. This gas cleaning treatment equipment includes: the desulfurization unit utilizes solid and/or liquid granular desulfurizer to mix with the flue gas to be purified and processed, and reacts and desulfurizes to form desulfurized flue gas; the dust removal unit performs gas-solid separation treatment on the desulfurized flue gas by using the gas-solid separation component to form dedusted flue gas; in a flue gas purification treatment flow path formed by sequentially connecting the desulfurization unit and the dust removal unit, the temperature of the flue gas to be purified is not lower than that of the desulfurized flue gas and not lower than that of the dust removed flue gas. The flue gas of the submerged arc furnace is subjected to high-temperature acid-base chemical reaction after gas extraction, so that the desulfurization efficiency is high; the dust removal unit is adopted to directly remove dust and purify high-temperature dust-containing flue gas, so that the working procedures are saved; part of the desulfurizer intercepted by the dust removal unit can realize deep desulfurization.
Description
Technical Field
The utility model relates to a technical field that the flue gas was handled particularly, relates to flue gas purification treatment facility.
Background
The submerged arc furnace is generally divided into three furnace types, the first type is a totally-enclosed type, the second type is a semi-open type, and the third type is an open type. The smoke gas production of the totally-enclosed submerged arc furnace is less, but because the temperature of the iron alloy and industrial silicon smelting charge surface is high and easy to cruse, the furnace ramming operation is required, the ventilation condition is improved, and carbon monoxide gas generated in the reduction process can be smoothly discharged, so that the submerged arc furnace required by adopting the totally-enclosed submerged arc furnace is complex in structure, the input equipment cost is very high, at present, few cases of success of the iron alloy and industrial silicon totally-enclosed submerged arc furnace exist in China, few small submerged arc furnaces below 5000KVA in China still adopt open submerged arc furnaces, and most of large and medium submerged arc furnaces adopt semi-open submerged arc furnaces. The semi-open submerged arc furnace is mainly characterized in that coal gas generated by the submerged arc furnace is directly combusted at a furnace mouth, and the discharged coal gas becomes flue gas.
The existing semi-open submerged arc furnace is simpler in flue gas purification treatment, and the common process is as follows: the high-temperature flue gas of the semi-open submerged arc furnace is collected by the dust collecting cover, the flue gas is subjected to air distribution and temperature control and then enters the dust remover after reaching the temperature acceptable by the dust remover (a bag-type dust remover or an electric dust remover), the flue gas after dust removal by the dust remover is subjected to alkali liquor absorption, and the flue gas after desulfurization is directly discharged. The main problems of the technical process are as follows:
(1) the semi-open type submerged arc furnace generates a large amount of oxynitride at the furnace mouth of the submerged arc furnace due to the production process, and the flue gas of the process is not subjected to denitration treatment, so that a large amount of oxynitride is discharged into the atmosphere, and the environment pollution is caused.
(2) In order to meet the requirement of the dust remover on the inlet air temperature, the temperature is controlled by adopting an air distribution mode, and the heat of the flue gas is not effectively recycled.
(3) The filter precision of the dust remover is difficult to meet the stricter dust emission requirement.
(4) The flue gas is absorbed by alkali liquor after dust removal, the desulfurization efficiency is low, and the generated larger sewage needs to be treated.
(5) The direct discharge of flue gas alkali liquor after absorption is easy to generate visible white smoke, which causes visual pollution, and the white removal treatment is usually required.
The iron-removing alloy and the industrial silicon ore heating furnace are all adopted by other ore heating furnaces. Although a plurality of desulfurization and denitrification integrated processes are also available in the existing fully-closed submerged arc furnace flue gas treatment, the integrated processes cannot be directly used for the semi-open submerged arc furnace, because the furnace door of the semi-open submerged arc furnace is opened and a large amount of cold air is mixed in, the flue gas volume of the semi-open submerged arc furnace is about 10-15 times of the coal gas volume of the fully-closed submerged arc furnace; for example, the smoke generated by producing one ton of manganese-silicon alloy by the semi-open type ore-smelting furnace is 24000-; because the flue gas amount is huge and the heat is high, the flue gas treatment efficiency of the existing process is difficult to meet the requirement, and therefore a unique flue gas treatment process must be arranged.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims to provide a flue gas purification treatment facility and flue gas purification treatment method to solve the not thorough technical problem of processing that current process equipment handled the hot stove flue gas in semi-open ore deposit and exists.
In order to achieve the above object, according to an aspect of the present invention, there is provided a flue gas purification treatment apparatus. This gas cleaning treatment equipment includes:
the desulfurization unit utilizes solid and/or liquid granular desulfurizer to mix with the flue gas to be purified and processed, and reacts and desulfurizes to form desulfurized flue gas;
the dust removal unit performs gas-solid separation treatment on the desulfurized flue gas by using the gas-solid separation component to form dedusted flue gas; and
the denitration unit is used for mixing a denitration reducing agent with the dedusted flue gas and carrying out reaction denitration under the condition of catalysis of a catalyst or not to form denitrated flue gas;
in a flue gas purification treatment flow path formed by sequentially connecting the desulfurization unit, the dust removal unit and the denitration unit, the temperature of the flue gas to be purified is not lower than that of the desulfurized flue gas and not lower than that of the dedusted flue gas.
The flue gas is subjected to high-temperature acid-base chemical reaction after being subjected to gas taking, and the conversion rate is high due to high reaction temperature, so that the flue gas treatment capacity in unit time is improved; the corrosivity and the temperature of the flue gas after the chemical reaction are greatly reduced, and the subsequent equipment is protected; the temperature of the desulfurized flue gas is still higher than the service temperature of the bag-type dust remover, the bag-type dust remover is adopted for dust removal, air distribution and cooling are needed firstly, otherwise, the bag pasting phenomenon is easy to occur, therefore, the utility model adopts the dust removal unit capable of bearing high temperature to directly remove and purify the desulfurized flue gas, and the working procedures can be effectively saved; part of the desulfurizer intercepted by the gas-solid separation component of the dust removal unit can further react with acidic substances which are not completely removed from the flue gas, so that deep desulfurization is realized. When the denitration catalyst is used for denitration, the high-temperature dust-free flue gas obtained by the dust removal unit cannot cause the problems of blockage, poisoning and the like of the denitration catalyst, and can ensure that the denitration catalyst can exert the maximum denitration catalytic efficiency within the proper temperature range for denitration; it can be seen that, the utility model discloses get the temperature variation trend after the gas according to the flue gas, set for specific unit order, make the temperature of unit temperature and flue gas match with the biggest purifying effect of performance, through each joint synergism, realize the integration of degree of depth desulfurization dust removal. The utility model discloses a flue gas purification treatment facility is particularly suitable for handling the flue gas of the hot stove in semi-open ore deposit, also can be applicable to the flue gas of the full closed type crazy hot stove certainly and handle.
Further, the device also comprises a first detector for detecting the temperature of the dedusted flue gas or the denitrated flue gas; and/or a second detector for detecting the sulfur content of the desulfurized flue gas or the dedusted flue gas; and/or a third detector for detecting the content of the oxynitride in the denitrated flue gas. Therefore, the parameters of each unit are adaptively adjusted through the detection result, and the flue gas purification effect is ensured.
In order to achieve the above object, according to one aspect of the present invention, there is provided another flue gas cleaning treatment apparatus. This gas cleaning treatment equipment includes:
the desulfurization unit utilizes solid and/or liquid granular desulfurizer to mix with the flue gas to be purified and processed, and reacts and desulfurizes to form desulfurized flue gas;
the dust removal unit performs gas-solid separation treatment on the desulfurized flue gas by using the gas-solid separation component to form dedusted flue gas;
in a flue gas purification treatment flow path formed by sequentially connecting the desulfurization unit and the dust removal unit, the temperature of the flue gas to be purified is not lower than that of the desulfurized flue gas and not lower than that of the dust removed flue gas.
The device further comprises a waste heat recovery unit, wherein the waste heat recovery unit is arranged at the output end of the flue gas purification treatment flow path; and a flue gas waste heat recovery facility is not arranged in the flue gas purification treatment flow path. The high-temperature flue gas after desulfurization, dust removal and denitration is subjected to waste heat recovery, the recovery heat efficiency is high, and the problems of corrosion of waste heat recovery equipment and the like do not exist; it can be seen that each joint acts synergistically according to a specific sequence, and compared with the traditional semi-open type submerged arc furnace flue gas treatment equipment, the flue gas treatment capacity in unit time is remarkably improved.
Further, the waste heat recovery unit adopts a waste heat boiler and/or a tubular heat exchanger; and/or the waste heat recovery unit is used for cooling the flue gas output by the flue gas purification treatment flow path to 80-100 ℃; and/or the flue gas emission unit is used for emitting the flue gas after the waste heat of the waste heat recovery unit is recovered. Reducing the temperature of the flue gas to 80-100 ℃ can ensure higher heat recovery amount, faster recovery speed and no generation of white smoke. The flue gas after waste heat recovery reaches the emission standard and can be directly discharged from the flue gas emission unit.
Furthermore, the dust removal unit adopts a filter element which mechanically intercepts solid particles in the desulfurized flue gas to realize gas-solid separation as a gas-solid separation component; and/or the dedusting unit can control the content of solid particles in the dedusted flue gas to be 20mg/Nm3Less, preferably 10mg/Nm3Less, more preferably 5mg/Nm3The following metal filter element or ceramic filter element. Therefore, the dust content discharge requirement is met.
Further, the device is used for purifying the smoke absorbed by the dust collection cover on the top of the semi-open type submerged arc furnace; and/or the average temperature of the flue gas to be purified is more than or equal to 250 ℃, preferably 300-600 ℃, and more preferably 450-550 ℃. Therefore, each unit can efficiently purify the flue gas at a proper flue gas temperature without additional temperature rise or temperature reduction.
Further, the desulfurization unit is a desulfurization unit capable of bringing a portion of the solid and/or liquid particulate desulfurizing agent supplied from the desulfurization unit into excess by the desulfurized flue gas into the dust removal unit under control. Therefore, a desulfurizer filter cake layer is formed on the surface of the gas-solid separation component of the dust removal unit, and deep desulfurization of flue gas is realized.
Further, the device also comprises a dissolving unit for dissolving the solid granular desulfurizer into the absorbent and an atomizing unit for atomizing the absorbent into the liquid granular desulfurizer and spraying the liquid granular desulfurizer into the desulfurization unit. By means of atomization, the desulfurizer can be uniformly distributed in the flue gas so as to quickly generate chemical reaction, the moisture in atomized liquid drops is quickly evaporated at high temperature, the temperature of the flue gas can be reduced, and reaction products and the unused desulfurizer are brought out of the desulfurization unit along with the flue gas in a dry particulate form.
Further, the device also comprises an ash conveying unit which is used for inputting the particles intercepted by the dust removal unit into the desulfurization unit again; and/or the smoke suction unit is used for providing power for the gradual flow of the smoke to be purified. Therefore, part of the desulfurizer intercepted by the gas-solid separation component of the dust removal unit can reenter the desulfurization unit to participate in desulfurization reaction, and the desulfurization cost is obviously reduced. The flue gas suction unit can provide traction force for the flow of flue gas, promotes flue gas processing speed.
In order to achieve the above object, according to another aspect of the present invention, a method for purifying flue gas is provided. The flue gas purification treatment method comprises the following steps:
treating the flue gas to be purified by a desulfurization unit, wherein the desulfurization unit utilizes solid and/or liquid granular desulfurizer to mix and react with the flue gas to be purified to desulfurize to form desulfurized flue gas;
the desulfurized flue gas is treated by a dust removal unit, and the dust removal unit carries out gas-solid separation treatment on the desulfurized flue gas by using a gas-solid separation component to form the dedusted flue gas; and
the method comprises the following steps of treating dedusted flue gas through a denitration unit, wherein the denitration unit is used for mixing a denitration reducing agent with the dedusted flue gas and carrying out reaction denitration under the condition of catalysis of a catalyst or not to form denitrated flue gas;
in a flue gas purification treatment flow path formed by sequentially connecting the desulfurization unit, the dust removal unit and the denitration unit, the temperature of the flue gas to be purified is not lower than that of the desulfurized flue gas and not lower than that of the dedusted flue gas.
Further, the method comprises the following control steps:
a) carrying out first detection on the temperature of the dedusted flue gas or the denitrated flue gas, and judging whether the temperature of the dedusted flue gas belongs to the set denitration proper temperature or not according to a first detection result, if so, entering the step c), and if not, entering the step b);
b) adjusting the flue gas treatment flow of the desulfurization unit according to the first detection result: when the first detection result is higher than the set denitration proper temperature, the flue gas treatment flow is reduced, and when the first detection result is lower than the set denitration proper temperature, the flue gas treatment flow is increased;
c) carrying out second detection on the sulfur content of the desulfurized flue gas or the dedusted flue gas, and judging whether the sulfur content after desulfurization reaches the standard according to a second detection result, if so, entering the step e), otherwise, entering the step d);
d) increasing the supply amount of the solid and/or liquid granular desulfurizing agent supplied by the desulfurizing unit according to a set mode, and then returning to the step c);
e) repeating the step a) according to a set period.
Further, the denitration unit mixes the denitration reducing agent with the dedusted flue gas and carries out reaction denitration under the condition of catalysis of the SCR catalyst to form the denitrated flue gas, at the moment, the SCR catalyst is a vanadium-tungsten-titanium catalyst, and the suitable temperature for denitration is 350-390 ℃; and/or the method also comprises the steps of carrying out third detection on the content of the oxynitride of the denitrated flue gas, judging whether the oxynitride reaches the standard according to a third detection result, if so, maintaining the state of the existing denitration unit (103), and if not, increasing the supply amount of the SCR catalyst and/or the denitration reducing agent by the denitration unit according to a set mode.
In order to achieve the above object, according to another aspect of the present invention, another flue gas purification treatment method is provided. The flue gas purification treatment method comprises the following steps:
treating the flue gas to be purified by a desulfurization unit, wherein the desulfurization unit utilizes solid and/or liquid granular desulfurizer to mix and react with the flue gas to be purified to desulfurize to form desulfurized flue gas;
the desulfurized flue gas is treated by a dust removal unit, and the dust removal unit carries out gas-solid separation treatment on the desulfurized flue gas by using a gas-solid separation component to form the dedusted flue gas;
in a flue gas purification treatment flow path formed by sequentially connecting the desulfurization unit and the dust removal unit, the temperature of the flue gas to be purified is not lower than that of the desulfurized flue gas and not lower than that of the dust removed flue gas.
Further, part of the solid and/or liquid granular desulfurizer supplied by the desulfurization unit is excessive and is carried into the dust removal unit by the desulfurized flue gas; and/or when the desulfurization unit supplies the liquid granular desulfurizing agent, the temperature in the flue gas purification treatment flow path can ensure that the liquid granular desulfurizing agent is converted into the solid granular desulfurizing agent before the liquid granular desulfurizing agent passes through a gas-solid separation component of the dust removal unit; and/or the liquid granular desulfurizer is obtained by dissolving and atomizing the solid granular desulfurizer.
Further, the device is used for purifying the smoke absorbed by the dust collection cover on the top of the semi-open type submerged arc furnace; and/or the average temperature of the flue gas to be purified is more than or equal to 250 ℃, preferably 300-600 ℃, and more preferably 450-550 ℃.
Further, a waste heat recovery unit is adopted to recover the flue gas heat at the output end of the flue gas purification treatment flow path; and a flue gas waste heat recovery facility is not arranged in the flue gas purification treatment flow path.
Further, the waste heat recovery unit adopts a waste heat boiler and/or a tubular heat exchanger; and/or the waste heat recovery unit is used for cooling the flue gas output by the flue gas purification treatment flow path to 80-100 ℃; and/or the flue gas emission unit is used for emitting the flue gas after the waste heat of the waste heat recovery unit is recovered.
Furthermore, the dust removal unit adopts a filter element which mechanically intercepts solid particles in the desulfurized flue gas to realize gas-solid separation as a gas-solid separation component; and/or the dedusting unit can control the content of solid particles in the dedusted flue gas to be 20mg/Nm3Less, preferably 10mg/Nm3Less, more preferably 5mg/Nm3The following metal filter element or ceramic filter element.
Further, the method also comprises the step of inputting the particles intercepted by the dust removal unit into the desulfurization unit again through an ash conveying unit; and/or, the step-by-step flow of the flue gas to be purified is provided with power by adopting a flue gas suction unit.
The present invention will be further described with reference to the accompanying drawings and the detailed description. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which form a part of the disclosure, are included to assist in understanding the disclosure, and the description provided herein and the accompanying drawings, which are related thereto, are intended to explain the disclosure, but do not constitute an undue limitation on the disclosure. In the drawings:
fig. 1 is a schematic view of a flue gas purification treatment device according to embodiment 1 of the present invention.
Fig. 2 is a schematic view of a flue gas purification treatment device according to embodiment 2 of the present invention.
Fig. 3 is a schematic view of a flue gas purification treatment device according to embodiment 3 of the present invention.
Fig. 4 is a schematic view of a flue gas purification treatment apparatus according to embodiment 4 of the present invention.
Fig. 5 is a schematic view of a flue gas purification treatment apparatus according to embodiment 5 of the present invention.
Fig. 6 is a schematic view of a flue gas purification treatment apparatus according to embodiment 6 of the present invention.
The relevant references in the above figures are:
100: a semi-open type submerged arc furnace;
101: a desulfurization unit;
102: a dust removal unit;
103: a denitration unit;
104: a waste heat recovery unit;
106: a dust collection cover;
107: an ash conveying unit;
108: a flue gas suction unit;
109: a flue gas discharge unit;
110: a feeding unit;
111: a dissolving unit;
112: an atomizing unit;
113: a first detector;
114: a second detector;
115: a third detector.
Detailed Description
The present invention will be described more fully with reference to the accompanying drawings. Those of ordinary skill in the art will be able to implement the invention based on these descriptions. Before the present invention is described with reference to the accompanying drawings, it is to be noted that:
the technical solutions and features provided in the present invention in each part including the following description may be combined with each other without conflict.
Moreover, references to embodiments of the invention in the following description are generally only to be considered as examples of the invention, and not as all embodiments. Therefore, all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention shall fall within the protection scope of the present invention.
With respect to the terms and units of the present invention. The terms "comprising," "having," and any variations thereof in the description and claims of this invention and the related sections are intended to cover non-exclusive inclusions.
Example 1
Fig. 1 is a schematic view of a flue gas purification treatment device according to embodiment 1 of the present invention. As shown in fig. 1, the flue gas cleaning treatment apparatus includes:
the dust collection cover 106 is used for collecting flue gas at the top of the semi-open submerged arc furnace 100 to obtain flue gas to be purified, and the average temperature of the flue gas to be purified is 450-550 ℃;
the desulfurization unit 101 mixes and reacts the solid granular desulfurizer with the flue gas to be purified to desulfurize to form desulfurized flue gas, and part of the solid granular desulfurizer supplied by the desulfurization unit 101 is excessive under control and is brought into the dust removal unit 102 by the desulfurized flue gas; the solid granular desulfurizer is quicklime;
a dust removal unit 102, wherein the dust removal unit 102 mechanically intercepts solid particles in the desulfurized flue gas to remove the solids in the desulfurized flue gasThe content of the particulate matters is controlled to be 10mg/Nm3The metal filter element below is a gas-solid separation component;
in a flue gas purification treatment flow path formed by sequentially connecting the desulfurization unit 101 and the dust removal unit 102, the temperature of the flue gas to be purified is not lower than that of the desulfurized flue gas and not lower than that of the dedusted flue gas;
the waste heat recovery unit 104 is arranged at the output end of the flue gas purification treatment flow path, and a waste heat boiler for cooling the flue gas output by the flue gas purification treatment flow path to 80-100 ℃ is adopted;
the flue gas suction unit 108 adopts an induced draft fan which provides power for the gradual flow of the flue gas to be purified;
a flue gas discharge unit 109 that uses a chimney for discharging flue gas from which waste heat is recovered;
and a feeding unit 110 for conveying the solid granular desulfurizing agent.
The second detector 114 is arranged at the input end of the dust removal unit 102 and is used for detecting the sulfur content of the desulfurized flue gas;
the flue gas purification treatment method adopting the flue gas purification treatment equipment comprises the following steps:
treating flue gas to be purified through a desulfurization unit 101, wherein the desulfurization unit 101 utilizes a solid granular desulfurizer to mix with the flue gas to be purified and react for desulfurization to form desulfurized flue gas;
the desulfurized flue gas is processed by the dust removal unit 102, and the dust removal unit 102 performs gas-solid separation processing on the desulfurized flue gas by using a gas-solid separation component to form the dedusted flue gas;
the control steps comprise:
detecting the sulfur content of the desulfurized flue gas by using a second detector 114, judging whether the sulfur content of the desulfurized flue gas reaches the standard according to the detection result, if so, maintaining the state of the existing desulfurization unit 101, and if not, increasing the supply amount of the desulfurization unit 101 to the solid granular desulfurizer according to a set mode; the index of the sulfur content is less than or equal to 30mg/m3。
Example 2
Compared with embodiment 1, the flue gas cleaning treatment apparatus and the flue gas cleaning treatment method of the present embodiment have the following differences: as shown in fig. 2, the method further includes:
the dissolving unit 111 is used for dissolving the solid granular desulfurizer conveyed by the feeding unit 110 into an absorbent;
the atomization unit 112 atomizes the absorbent into a liquid granular desulfurizer and sprays the liquid granular desulfurizer into the desulfurization unit 101, and the desulfurization unit 101 mixes the liquid granular desulfurizer with the flue gas to be purified and performs reaction desulfurization to form desulfurized flue gas; the liquid granular desulfurizer is quicklime water slurry;
at the flue gas temperature of the flue gas purification treatment flow path, part of the liquid granular desulfurizing agent which is not reacted and carried by the desulfurized flue gas is converted into a solid granular desulfurizing agent before passing through the gas-solid separation part of the dust removal unit 102.
The second detector 114 is arranged at the output end of the dust removal unit 102, and is used for detecting the sulfur content of the dust-removed flue gas, so that the influence of the dust content on the detection result can be avoided. And detecting the sulfur content of the dedusted flue gas by using a second detector 114, judging whether the sulfur content of the dedusted flue gas reaches the standard according to the detection result, if so, maintaining the state of the existing desulfurization unit 101, and if not, increasing the supply amount of the desulfurization unit 101 to the liquid granular desulfurizer according to a set mode.
Example 3
Compared with embodiment 2, the flue gas purification treatment apparatus and the flue gas purification treatment method of the present embodiment have the following differences: as shown in fig. 3, the method further includes:
the denitration unit 103 is used for mixing a denitration reducing agent with the dedusted flue gas and carrying out reaction and denitration on the mixture under the catalysis of an SCR (selective catalytic reduction) catalyst to form denitrated flue gas; the SCR catalyst is a selective catalytic reduction denitration catalyst, and specifically adopts a vanadium-tungsten-titanium catalyst;
in a flue gas purification treatment flow path formed by sequentially connecting the desulfurization unit 101, the dust removal unit 102 and the denitration unit 103, the temperature of the flue gas to be purified is not lower than the temperature of the desulfurized flue gas and not lower than the temperature of the dedusted flue gas and not lower than the temperature of the denitrated flue gas.
The first detector 113 is arranged at the output end of the dust removal unit 102 and used for detecting the temperature of the dedusted flue gas;
the flue gas purification treatment method further comprises the step of treating the dedusted flue gas through a denitration unit, wherein the denitration unit is used for mixing a denitration reducing agent with the dedusted flue gas and carrying out reaction and denitration under the condition of catalysis of a catalyst or not so as to form the denitrated flue gas.
The control steps are as follows:
a) carrying out first detection on the temperature of the dedusted flue gas, and judging whether the temperature of the dedusted flue gas is the set denitration proper temperature or not according to a first detection result, if so, entering the step c), otherwise, entering the step b);
b) according to the first detection result, the flue gas treatment flow of the desulfurization unit 101 is adjusted: when the first detection result is higher than the set denitration proper temperature, the flue gas treatment flow is reduced, and when the first detection result is lower than the set denitration proper temperature, the flue gas treatment flow is increased;
c) carrying out second detection on the sulfur content of the dedusted flue gas, and judging whether the sulfur content of the dedusted flue gas reaches the standard according to a second detection result, if so, entering the step e), otherwise, entering the step d);
d) increasing the supply amount of the liquid granular desulfurizer supplied by the desulfurization unit 101 according to a set mode, and then returning to the step c);
e) repeating the step a) according to a set period.
The suitable denitration temperature is 350-390 ℃, and the index of the sulfur content is less than or equal to 30mg/m3。
Example 4
Compared with embodiment 3, the flue gas cleaning treatment apparatus and the flue gas cleaning treatment method of the present embodiment have the following differences: as shown in fig. 4, the method further includes:
the third detector 115 is arranged at the output end of the denitration unit 103 and is used for detecting the content of oxynitride in the denitrated flue gas;
the control step of the flue gas purification treatment method also comprisesThirdly detecting the content of the oxynitride in the denitrated flue gas by using a third detector 115, judging whether the oxynitride reaches the standard according to a third detection result, if so, maintaining the state of the existing denitration unit 103, and if not, increasing the supply of the denitration unit 103 to the SCR catalyst in a set manner; the nitrogen oxide index is less than or equal to 30mg/m3. This step, independently of steps a) to e) of example 3, can be carried out simultaneously or separately.
Example 5
Compared with embodiment 4, the flue gas cleaning treatment apparatus and the flue gas cleaning treatment method of the present embodiment have the following differences: as shown in fig. 5, the first detector 113 is disposed at an output end of the denitration unit 103, and is configured to detect the temperature of the denitrated flue gas, and if the temperature of the denitrated flue gas does not reach the standard, it indicates that the temperature of the dedusted flue gas does not belong to the set suitable denitration temperature.
Example 6
Compared with embodiment 4, the flue gas cleaning treatment apparatus and the flue gas cleaning treatment method of the present embodiment have the following differences: as shown in fig. 6: and an ash conveying unit 107 for inputting the particles intercepted by the dust removing unit 102 into the desulfurization unit 101 again.
The contents of the present invention have been explained above. Those of ordinary skill in the art will be able to implement the invention based on these descriptions. Based on the above-mentioned contents of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.
Claims (14)
1. Flue gas purification treatment facility, its characterized in that includes:
the desulfurization unit (101) utilizes the solid granular desulfurizer and/or the liquid granular desulfurizer to be mixed with the flue gas to be purified and treated, and the mixture is reacted and desulfurized to form desulfurized flue gas;
the dust removal unit (102), the dust removal unit (102) utilizes the gas-solid separation component to carry out gas-solid separation treatment on the desulfurized flue gas to form dust-removed flue gas; and
the denitration unit (103) is used for mixing a denitration reducing agent with the dedusted flue gas and carrying out reaction denitration on the mixture under the condition of catalysis of a catalyst or not to form denitrated flue gas;
in a flue gas purification treatment flow path formed by sequentially connecting the desulfurization unit (101), the dust removal unit (102) and the denitration unit (103), the temperature of the flue gas to be purified is not lower than the temperature of the desulfurized flue gas and not lower than the temperature of the dedusted flue gas and not lower than the temperature of the denitrated flue gas.
2. The flue gas purification treatment device according to claim 1, wherein: the device also comprises a first detector (113) for detecting the temperature of the dedusted flue gas or the denitrated flue gas; and/or a second detector (114) for detecting the sulfur content of the desulfurized flue gas or the dedusted flue gas; and/or a third detector (115) for detecting the content of the oxynitride in the denitrated flue gas.
3. Flue gas purification treatment facility, its characterized in that includes:
the desulfurization unit (101) is used for mixing and reacting a solid and/or liquid granular desulfurizer with the flue gas to be purified and treated to desulfurize to form desulfurized flue gas;
the dust removal unit (102), the dust removal unit (102) utilizes the gas-solid separation component to carry out gas-solid separation treatment on the desulfurized flue gas to form dust-removed flue gas;
in a flue gas purification treatment flow path formed by sequentially connecting the desulfurization unit (101) and the dust removal unit (102), the temperature of the flue gas to be purified is not lower than that of the desulfurized flue gas and not lower than that of the dust removed flue gas.
4. The flue gas purification treatment device according to any one of claims 1 to 3, wherein: the device comprises a waste heat recovery unit (104), wherein the waste heat recovery unit (104) is arranged at the output end of the flue gas purification treatment flow path; and a flue gas waste heat recovery facility is not arranged in the flue gas purification treatment flow path.
5. The flue gas purification treatment device according to claim 4, wherein: the waste heat recovery unit (104) adopts a waste heat boiler and/or a tubular heat exchanger; and/or the waste heat recovery unit (104) is a waste heat recovery unit (104) which cools the flue gas output by the flue gas purification treatment flow path to 80-100 ℃; and/or the flue gas emission unit (109) is used for emitting the flue gas after the waste heat recovery of the waste heat recovery unit (104).
6. The flue gas purification treatment device according to any one of claims 1 to 3, wherein: the dust removal unit (102) adopts a filter element for mechanically intercepting solid particles in the desulfurized flue gas to realize gas-solid separation as a gas-solid separation component; and/or the dust removal unit (102) can control the content of solid particles in the dedusted flue gas to be 20mg/Nm3The following metal filter element or ceramic filter element.
7. The flue gas purification treatment device according to claim 6, wherein: the dedusting unit (102) can control the content of solid particles in the dedusted flue gas to be 10mg/Nm3The following metal filter element or ceramic filter element.
8. The flue gas purification treatment device according to claim 7, wherein: the dedusting unit (102) can control the content of solid particles in the dedusted flue gas to be 5mg/Nm3The following metal filter element or ceramic filter element.
9. The flue gas purification treatment device according to any one of claims 1 to 3, wherein: the device is used for purifying the smoke absorbed by the furnace top dust collecting cover (106) of the semi-open type submerged arc furnace (100); and/or the average temperature of the flue gas to be purified is more than or equal to 250 ℃.
10. The flue gas purification treatment device according to claim 9, wherein: the average temperature of the flue gas to be purified is 300-600 ℃.
11. The flue gas purification treatment device according to claim 10, wherein: the average temperature of the flue gas to be purified is 450-550 ℃.
12. The flue gas purification treatment device according to any one of claims 1 to 3, wherein: the desulfurization unit (101) is a desulfurization unit (101) which can lead part of solid and/or liquid granular desulfurizing agent supplied by the desulfurization unit (101) to be excessive under the control and be carried into the dust removal unit (102) by the desulfurized flue gas.
13. The flue gas purification treatment device according to any one of claims 1 to 3, wherein: the device also comprises a dissolving unit (111) for dissolving the solid granular desulfurizer into the absorbent and an atomizing unit (112) for atomizing the absorbent into the liquid granular desulfurizer and spraying the liquid granular desulfurizer into the desulfurization unit (101).
14. The flue gas purification treatment device according to any one of claims 1 to 3, wherein: the device also comprises an ash conveying unit (107) for inputting the particulate matters intercepted by the dust removal unit (102) into the desulfurization unit (101) again; and/or a flue gas suction unit (108) for providing power for the gradual flow of the flue gas to be purified.
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| CN201920839595.8U CN210905618U (en) | 2019-06-05 | 2019-06-05 | Flue gas purification treatment equipment |
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| CN201920839595.8U CN210905618U (en) | 2019-06-05 | 2019-06-05 | Flue gas purification treatment equipment |
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