CN213942653U - Flue gas circulating fluidized bed method desulfurization equipment - Google Patents
Flue gas circulating fluidized bed method desulfurization equipment Download PDFInfo
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- CN213942653U CN213942653U CN202022439326.8U CN202022439326U CN213942653U CN 213942653 U CN213942653 U CN 213942653U CN 202022439326 U CN202022439326 U CN 202022439326U CN 213942653 U CN213942653 U CN 213942653U
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Abstract
The utility model discloses a flue gas circulating fluidized bed method desulfurization device, which comprises a desulfurization tower for desulfurizing flue gas; the spray gun is used for spraying water into the desulfurizing tower; the water tank supplies water to the spray gun through the water pump, and the water outlet of the water pump is connected with the water inlet of the spray gun through a water supply pipe; the spray gun water inlet regulating valve is used for regulating the water inlet flow of the spray gun; and the water inlet of the bypass water conduit is connected with the water outlet of the water pump, and a bypass water diversion adjusting valve for adjusting the water inlet pressure of the spray gun is arranged on the bypass water conduit. In the process of the change of the operating condition of the main machine, the water spraying amount of the spray gun is controlled by adjusting the two adjusting valves; when the water spraying amount of the spray gun needs to be reduced, the opening degree of a water inlet regulating valve of the spray gun is adjusted to be small, and a bypass water diversion regulating valve is synchronously adjusted to be large; when the water spraying amount of the spray gun needs to be increased, the opening degree of a water inlet regulating valve of the spray gun is increased, and a bypass water diversion regulating valve is synchronously decreased; the method can meet the low water consumption requirement of flue gas desulfurization by a flue gas circulating fluidized bed method under the working conditions of small unit, large humidity and low sulfur content from low load to high load of a main engine.
Description
Technical Field
The utility model relates to a flue gas circulating fluidized bed method flue gas desulfurization technical field, more specifically say, relate to a flue gas circulating fluidized bed method sweetener.
Background
According to the international desulfurization technology development and market law, the flue gas circulating fluidized bed desulfurization process has become the mainstream process for tail gas treatment in industries such as sintering machines, boilers, glass kilns and the like. The flue gas circulating fluidized bed method desulfurization process needs to spray water into a flue gas circulating fluidized bed method tower for cooling, in order to ensure that materials discharged from the flue gas circulating fluidized bed method tower are in a dry powder state, the temperature of flue gas at the outlet of the desulfurization tower needs to be higher than the acid dew point by more than 15 ℃, the water consumption is low, and particularly, the minimum water consumption is less than 1t/h when a small unit, high humidity and low sulfur content are matched with a flue gas circulating fluidized bed method desulfurization device.
The traditional flue gas circulation fluidized bed method desulfurization device adopts a high-pressure atomization backflow type spray gun to spray water into the tower, is limited by the matching property of a high-pressure water pump and the high-pressure atomization backflow type spray gun and the requirement of spray gun atomization particle size, is suitable for the high-pressure atomization backflow type spray gun to select a type of 5t/h or more, has small water consumption for desulfurization processes of small units and high-humidity low-sulfur projects, is not suitable for adopting the high-pressure atomization backflow type spray gun, and is replaced by a double-fluid spray gun.
The fluctuation of the host load directly influences the water consumption, and the desulfurization device needs to control the cooling water consumption according to the fluctuation of the unit load. The double-fluid spray gun is adopted, the water spraying amount of the spray gun is mainly adjusted through the variable-frequency centrifugal pump, and the frequency of the variable-frequency centrifugal pump is adjusted to meet the water consumption requirement of the flue gas desulfurization device under different working conditions.
However, the frequency adjusting range of the variable frequency centrifugal pump is limited, the frequency is too low, the water pump cannot discharge water normally, and the adjustable range of the variable frequency centrifugal pump is 25 Hz-50 Hz according to actual operation experience. When the host machine has working conditions of low load, low smoke volume and low smoke temperature, the process water consumption required by desulfurization is extremely low and exceeds the adjustable range of the variable-frequency centrifugal pump, once the water spraying amount is too much, bed materials in the desulfurization tower are overhumized, a series of problems of hardening in the tower, bag pasting of a rear-end filter bag and the like are caused, the long-term stable operation of the system is directly influenced, and therefore the variable-frequency centrifugal pump cannot meet the requirement of the full-load operation working condition of the flue gas circulating fluidized bed flue gas desulfurization device.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model discloses a flue gas circulation fluidized bed method sweetener is disclosed to the realization satisfies the water consumption requirement of host computer full load operating mode.
In order to achieve the above object, the utility model discloses a following technical scheme:
a flue gas circulating fluidized bed method desulfurization device comprises a desulfurization tower for desulfurizing flue gas; the spray gun is used for spraying water into the desulfurizing tower; the water tank supplies water to the spray gun through a water pump, and a water outlet of the water pump is connected with a water inlet of the spray gun through a water supply pipe; further comprising:
the spray gun water inlet regulating valve is used for regulating the water inlet flow of the spray gun;
the water inlet of the bypass water conduit is connected with the water outlet of the water pump, and a bypass water guide adjusting valve used for adjusting the water inlet pressure of the spray gun is arranged on the bypass water conduit.
Preferably, in the above flue gas circulating fluidized bed desulfurization apparatus, a water outlet of the bypass water conduit is connected to a water return port of the water tank, and the bypass water conduit regulating valve forms a water return regulating valve.
Preferably, the flue gas circulating fluidized bed desulfurization apparatus further includes:
the temperature detector is used for detecting the outlet temperature of the desulfurizing tower;
the controller is connected with the temperature detector and the spray gun water inlet regulating valve, and when the temperature of the outlet of the desulfurizing tower is lower than a target temperature value, the controller reduces the opening degree of the spray gun water inlet regulating valve; when the outlet temperature of the desulfurizing tower is higher than a target temperature value, the controller increases the opening of the spray gun water inlet regulating valve;
wherein the target temperature value is 10-20 ℃ higher than the dew point temperature of the flue gas acid.
Preferably, the flue gas circulating fluidized bed desulfurization equipment further comprises a pressure transmitter for detecting water pressure in the water supply pipe, wherein the pressure transmitter is positioned on the water inlet side of the spray gun water inlet regulating valve, and the pressure transmitter and the water return regulating valve are both connected with the controller;
when the water pressure in the water supply pipe is greater than a high target pressure value, the controller increases the opening degree of the backwater regulating valve; and when the water pressure in the water supply pipe is smaller than the low target pressure value, the opening degree of the backwater regulating valve is reduced by the controller.
Preferably, in the flue gas circulating fluidized bed desulfurization apparatus, the temperature detector is a thermometer.
Preferably, in the above flue gas circulating fluidized bed desulfurization apparatus, the lance water inlet adjusting valve is disposed at one end of the water supply pipe close to the lance.
Preferably, in the above flue gas circulating fluidized bed desulfurization apparatus, a water inlet of the bypass water conduit is connected to one end of the water supply pipe close to the water pump.
Preferably, in the flue gas circulating fluidized bed desulfurization equipment, the spray gun is a two-fluid spray gun.
Preferably, in the above flue gas circulating fluidized bed desulfurization apparatus, the water pump is a power frequency centrifugal pump.
According to the technical scheme, the flue gas circulating fluidized bed method desulfurization equipment comprises a desulfurization tower for desulfurizing flue gas; the spray gun is used for spraying water into the desulfurizing tower; the water tank supplies water to the spray gun through the water pump, and the water outlet of the water pump is connected with the water inlet of the spray gun through a water supply pipe; the spray gun water inlet adjusting valve is used for adjusting the water inlet flow of the spray gun; the bypass water diversion pipe is provided with a bypass water diversion adjusting valve used for adjusting the water inlet pressure of the spray gun.
The utility model discloses a bypass water pipe draws forth the partly water of water pump delivery port output, can reduce the water yield in the supply spray gun.
In the process of the change of the operation condition of the main machine, the water spraying amount of the spray gun is controlled by synchronously adjusting the spray gun water inlet adjusting valve and the bypass water diversion adjusting valve; when the water spraying amount of the spray gun needs to be reduced, the opening degree of a water inlet regulating valve of the spray gun is adjusted to be small, and a bypass water diversion regulating valve is synchronously adjusted to be large; when the water spraying amount of the spray gun needs to be increased, the opening degree of a water inlet regulating valve of the spray gun is increased, and a bypass water diversion regulating valve is synchronously decreased; therefore, the problem that the desulfurization efficiency of the desulfurization tower is influenced because the desulfurization tower cannot be cooled normally because the water pump cannot discharge water normally due to low water consumption is solved; or the water pump output is too large, so that the water spray quantity of the desulfurizing tower is too much, the desulfurized ash is too wet, the cloth bag is pasted, and the desulfurized ash is hardened to influence the normal operation of the system, the low water consumption of flue gas desulfurization of a small unit, high humidity and low sulfur under the working condition from low load to high load of the main engine can be met, the water consumption requirement of the full-load operation working condition of the flue gas circulating fluidized bed method desulfurization equipment is met, and the flue gas pollutants are ensured to be discharged up to the standard under the full-load working condition of the main engine.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of a process flow of a flue gas circulating fluidized bed desulfurization device disclosed in the embodiment of the present invention.
Detailed Description
The embodiment of the utility model discloses flue gas circulation fluidized bed method sweetener can satisfy the water consumption requirement of host computer full load operating mode.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, a flue gas circulating fluidized bed desulfurization apparatus disclosed in the embodiment of the present invention includes a desulfurization tower 2 for desulfurizing flue gas; a spray gun 9 for spraying water into the desulfurizing tower 2; a water tank 6 for supplying water to the spray gun 9 through a water pump 7, wherein the water outlet of the water pump 7 is connected with the water inlet of the spray gun 9 through a water supply pipe; the spray gun water inlet adjusting valve 8 is used for adjusting the water inlet flow of the spray gun 9; and a water inlet of the bypass water conduit is connected with a water outlet of the water pump 7, and a bypass water guide adjusting valve for adjusting the water inlet pressure of the spray gun is arranged on the bypass water conduit.
The utility model discloses a bypass water pipe draws forth the partly water of 7 delivery port outputs of water pump, can reduce the water yield in the spray gun 9 of supplying with.
In the process of changing the operation condition of the main machine 1, the water spraying amount of the spray gun 9 is controlled by synchronously adjusting the spray gun water inlet adjusting valve 8 and the bypass water diversion adjusting valve; when the water spraying amount of the spray gun 9 needs to be reduced, the opening degree of the spray gun water inlet regulating valve 8 is reduced, and the bypass water diversion regulating valve is synchronously increased; when the water spraying amount of the spray gun 9 needs to be increased, the opening degree of the spray gun water inlet regulating valve 8 is increased, and the bypass water diversion regulating valve is synchronously decreased; therefore, the problem that the desulfurization efficiency of the desulfurization tower 2 is influenced because the desulfurization tower 2 cannot be cooled normally because the water pump 7 cannot discharge water normally due to low water consumption is solved; or the water pump 7 exerts too much force, which causes the excessive water spraying amount of the desulfurizing tower 2, and causes the problem that the normal operation of the system is influenced by the overhumidity of the desulfurization ash of the flue gas circulating fluidized bed method, bag pasting of the cloth bag and hardening of the desulfurization ash, thereby meeting the low water consumption of the flue gas desulfurization of a small unit, large humidity and low sulfur under the working condition from low load to high load of the main machine, realizing the water consumption requirement of the full-load operation working condition of the desulfurization equipment of the flue gas circulating fluidized bed method, and ensuring that the flue gas pollutants reach the standard and are discharged under the full-.
The main function of spraying atomized water into the desulfurizing tower 2 by the flue gas circulating fluidized bed method desulfurizing equipment is to reduce the temperature of the flue gas to be about 15-20 ℃ higher than the dew point of the flue gas and accelerate SO2The reaction rate with the desulfurization absorbent improves the desulfurization efficiency; secondly, the temperature of the smoke at the inlet of the bag-type dust collector is reduced, the filter bag of the bag-type dust collector is prevented from being damaged by high temperature, and the service life of the filter bag is prolonged; thirdly, the viscosity of the high-density bed layer material in the desulfurizing tower 2 is increased, which is beneficial to promoting submicron PM2.5/PM10And the ultrafine particles are agglomerated and condensed into coarse particles, so that the dust removal efficiency of the bag-type dust remover is improved.
When the device is used, flue gas output by the main machine 1 enters the desulfurizing tower 2 for desulfurization, then enters the bag-type dust remover 3 for dust removal, and finally purified flue gas is conveyed to a chimney through the induced draft fan 4 to be discharged.
In order to facilitate the recycling of the water led out by the bypass water leading pipe, the water outlet of the bypass water leading pipe is connected with the water return port of the water tank 6, and the bypass water leading regulating valve forms a water return regulating valve 11. In the embodiment, a bypass water conduit is utilized to return part of water output from the water outlet of the water pump 7 to the water tank 6, so that the structure is simplified. Of course, the bypass water conduit of the present invention can also guide water to other structures, such as an individual water storage structure.
In order to accurately control the opening degree of the water inlet regulating valve, the flue gas circulating fluidized bed method desulfurization equipment further comprises a temperature detector 5 for detecting the temperature of the outlet of the desulfurization tower 2; the controller is connected with the temperature detector 5 and the spray gun water inlet regulating valve 8, and when the temperature of the outlet of the desulfurizing tower 2 is lower than a target temperature value, the controller reduces the opening degree of the spray gun water inlet regulating valve 8; when the temperature of the outlet of the desulfurizing tower 2 is higher than the target temperature value, the controller increases the opening of the spray gun water inlet regulating valve 8; wherein the target temperature value is 10-20 ℃ higher than the dew point temperature of the flue gas acid.
When the load of the main machine 1 is reduced, the detection value of the temperature detector 5 is lower than the target temperature value, and the opening degree of the spray gun water inlet regulating valve 8 is reduced; when the load of the main machine 1 is increased, the detection value of the temperature detector 5 is higher than the target temperature value, and the opening degree of the spray gun water inlet regulating valve 8 is increased.
It can be understood that the utility model discloses can also adjust the aperture of spray gun governing valve 8 that intakes according to host computer 1 load.
In order to accurately control the opening of the return water regulating valve 11, the flue gas circulating fluidized bed desulfurization equipment further comprises a pressure transmitter 10 for detecting the water pressure in the water supply pipe, wherein the pressure transmitter 10 is positioned on the water inlet side of the spray gun water inlet regulating valve 8, and the pressure transmitter 10 and the return water regulating valve 11 are both connected with a controller; when the water pressure in the water supply pipe is greater than the high target pressure value, the controller increases the opening degree of the water return regulating valve 11; when the water pressure in the water supply pipe is smaller than the low target pressure value, the controller reduces the opening degree of the water return regulating valve 11.
In the embodiment, a high target pressure value of the pressure transmitter 10 is set as a high alarm value (for example, the set value is 0.6MPa), when the pressure transmitter 10 reaches the high alarm value, it can be judged that a certain pressure building phenomenon exists on an outlet pipeline of the water pump 7, and the opening degree of the water return regulating valve 11 is adjusted by opening the high alarm value until a high pressure alarm signal disappears, so that the pipeline pressure building phenomenon is eliminated; by setting the low target pressure value of the pressure transmitter 10 as the low alarm value (if the set value is 0.3MPa), when the pressure transmitter 10 reaches the low alarm value, the opening degree of the return water regulating valve 11 is too large, and the opening degree of the return water regulating valve 11 needs to be reduced until the low pressure alarm signal disappears, so that the water pressure at the inlet of the spray gun 9 is ensured to meet the atomization requirement.
The utility model discloses spout at 7 exports of water pump and set up pressure transmitter 10 for judge that 7 export pipelines of water pump exist and suppress the pressure, set for alarm value and 11 apertures of return water governing valve and carry out the interlocking, in time eliminate the pipeline and suppress the pressure phenomenon, ensure simultaneously that 9 entry water pressure of spray gun is not less than 9 atomizing required pressures of spray gun, satisfy the atomizing requirement.
The utility model discloses adjust 11 apertures of return water governing valve according to water pressure in the water supply pipe, of course, the utility model discloses also can adjust 11 apertures of return water governing valve correspondingly when adjusting 8 apertures of spray gun intake governing valve according to 2 export temperature of desulfurizing tower.
Preferably, the temperature detector 5 is a thermometer, and has a simple structure and low cost. The temperature detector 5 may also employ a temperature sensor.
As shown in figure 1, the spray gun water inlet regulating valve 8 is arranged at one end of the water supply pipe close to the spray gun 9, and is convenient to install. Alternatively, the lance feed regulating valve 8 may also be provided at the inlet of the lance 9.
To further facilitate assembly, the inlet of the bypass penstock is connected to the end of the supply pipe that is adjacent to the pump 7. The utility model discloses a pipeline section that is close to water pump 7 at the delivery pipe draws forth bypass leading pipe, simple structure. Of course, the water inlet of the bypass water conduit can also be directly connected with the water outlet of the water pump 7.
Preferably, the spray gun 9 is a two-fluid spray gun, and is more suitable for desulfurization requirements of small and medium-sized units with low water consumption and high-humidity low-sulfur projects. It is understood that the lance 9 may take other forms, and the present invention is not limited thereto.
In order to simplify the operation, the water pump 7 is a power frequency centrifugal pump. In the process of changing the operation condition of the main engine, the power frequency centrifugal pump operates at rated water yield and lift, and the requirement of the double-fluid spray gun on the water pressure of the inlet of the spray gun 9 under any working condition is conveniently guaranteed. The water pump 7 can also adopt a variable frequency centrifugal pump, and the output frequency of the variable frequency centrifugal pump is correspondingly adjusted according to the unit load.
When the flue gas circulating fluidized bed method desulfurization equipment disclosed by the utility model is operated, before the water pump 7 is started, the bypass diversion regulating valve is firstly fully opened, then the water pump 7 is started, and then the opening degree of the spray gun water inlet regulating valve 8 is regulated; before the water pump 7 is closed, the bypass water diversion regulating valve is fully opened, then the opening degree of the spray gun water inlet regulating valve 8 is closed, and then the water pump 7 is stopped.
After the flue gas circulating fluidized bed method desulfurization equipment is normally started, the water regulating valve 11 is fully opened at first; then starting the power frequency centrifugal pump; then gradually opening a spray gun water inlet regulating valve 8 until the detection value of an outlet thermometer of the desulfurizing tower 2 is 10-20 ℃ higher than the acid dew point temperature of the flue gas; after normal operation, adjust 8 apertures of spray gun inlet regulating valve through the 2 export flue gas temperature of stable control desulfurizing tower, according to 7 outlet pipeline pressures of water pump, adjust 11 apertures of return water regulating valve, avoid the water yield of spray gun 9 too big.
When the water pump 7 needs to be closed, the water return regulating valve 11 is fully opened; closing the opening of the spray gun water inlet regulating valve 8; the power frequency centrifugal pump is stopped to avoid the occurrence of water backflow to the spray gun 9.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A flue gas circulating fluidized bed method desulfurization device comprises a desulfurization tower (2) for desulfurizing flue gas; a spray gun (9) for spraying water into the desulfurizing tower (2); the water tank (6) supplies water to the spray gun (9) through a water pump (7), and a water outlet of the water pump (7) is connected with a water inlet of the spray gun (9) through a water supply pipe; it is characterized by also comprising:
the spray gun water inlet adjusting valve (8) is used for adjusting the water inlet flow of the spray gun (9);
and the water inlet of the bypass water conduit is connected with the water outlet of the water pump (7), and a bypass water conduit regulating valve for regulating the water inlet pressure of the spray gun is arranged on the bypass water conduit.
2. The flue gas circulating fluidized bed desulfurization apparatus according to claim 1, wherein the water outlet of the bypass water conduit is connected to the water return port of the water tank (6), and the bypass water conduit regulating valve forms a water return regulating valve (11).
3. The flue gas circulating fluidized bed desulfurization apparatus according to claim 2, characterized by further comprising:
a temperature detector (5) for detecting the outlet temperature of the desulfurizing tower (2);
the controller is connected with the temperature detector (5) and the spray gun water inlet regulating valve (8), and when the outlet temperature of the desulfurizing tower (2) is lower than a target temperature value, the controller reduces the opening degree of the spray gun water inlet regulating valve (8); when the outlet temperature of the desulfurizing tower (2) is higher than a target temperature value, the controller increases the opening degree of the spray gun water inlet regulating valve (8);
wherein the target temperature value is 10-20 ℃ higher than the dew point temperature of the flue gas acid.
4. The equipment for desulfurizing the flue gas by the circulating fluidized bed method according to claim 3, further comprising a pressure transmitter (10) for detecting the water pressure in the water supply pipe, wherein the pressure transmitter (10) is positioned on the water inlet side of the spray gun water inlet regulating valve (8), and the pressure transmitter (10) and the water return regulating valve (11) are both connected with the controller;
when the water pressure in the water supply pipe is greater than a high target pressure value, the controller increases the opening degree of the return water regulating valve (11); and when the water pressure in the water supply pipe is smaller than the low target pressure value, the controller reduces the opening degree of the return water regulating valve (11).
5. The flue gas circulating fluidized bed desulfurization apparatus according to claim 3, wherein the temperature detector (5) is a thermometer.
6. The flue gas circulating fluidized bed desulfurization apparatus according to claim 1, wherein said lance feed water regulating valve (8) is provided at an end of said water supply pipe adjacent to said lance (9).
7. The flue gas circulating fluidized bed desulfurization apparatus according to claim 1, wherein the inlet of the bypass water conduit is connected to one end of the water supply pipe close to the water pump (7).
8. The flue gas circulating fluidized bed desulfurization apparatus according to claim 1, wherein the lance (9) is a two-fluid lance.
9. The flue gas circulating fluidized bed desulfurization apparatus according to claim 1, wherein the water pump (7) is a power frequency centrifugal pump.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114405249A (en) * | 2020-10-28 | 2022-04-29 | 福建龙净脱硫脱硝工程有限公司 | Flue gas circulating fluidized bed method desulfurization equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114405249A (en) * | 2020-10-28 | 2022-04-29 | 福建龙净脱硫脱硝工程有限公司 | Flue gas circulating fluidized bed method desulfurization equipment |
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