CN115962470A - CO treatment incinerator system - Google Patents

Abstract

The invention discloses a CO treatment incinerator system which is characterized by comprising an incinerator, a combustor, an SNCR (selective non-catalytic reduction) denitration system and a controller; the combustor is provided with a flue gas inlet, an air supplement regulating valve, a flue gas combustion-supporting air inlet, a flue gas combustion-supporting air regulating valve, an air supplement combustion-supporting air inlet and an air supplement combustion-supporting air regulating valve; the outlet end of the incinerator is also provided with a temperature sensor for detecting the temperature of the flue gas at the outlet after incineration; the controller is electrically connected with the temperature sensor, the air supply adjusting valve, the flue gas combustion-supporting air adjusting valve and the air supply combustion-supporting air adjusting valve. The controller is used for automatically adjusting the air supply and the air supply combustion-supporting air supply amount or the flue gas combustion-supporting air supply amount according to the outlet flue gas temperature, so that the flue gas is fully combusted, and the content of CO and NOx in the combusted flue gas meets the requirement.

Description

A kind of CO treatment incinerator system

technical field

The invention belongs to the technical field of waste gas treatment, and in particular relates to a CO treatment incinerator system.

Background technique

Due to the needs of process production, the CO concentration in the flue gas at the outlet of the reduction titanium production kiln is 1-7%, and the NOx content is 70-100mg/Nm ³ . In order to meet the requirements of energy saving and carbon reduction, the CO concentration in the flue gas needs to be reduced to 300mg/m ³ or less, and NOx ≤ 50mg/Nm ³ , while the CO treatment system in the prior art cannot meet the above requirements.

Contents of the invention

The purpose of the present invention is to provide a CO treatment incinerator system to solve the deficiencies of the prior art.

The purpose of the present invention is achieved with the following technical solutions:

A CO treatment incinerator system, including an incinerator, a burner, an SNCR denitrification system and a controller;

There are 4 burners, which are arranged around the inlet end of the incinerator in a four-corner tangential circle; the burners are provided with a flue gas inlet, a supplementary air intake, a supplementary gas regulating valve, and a flue gas combustion-supporting valve. Air inlet and flue gas combustion-supporting air regulating valve, gas-supplementing combustion-supporting air inlet and gas-supplementing combustion-supporting air regulating valve;

The SNCR denitrification system is located between the inlet and outlet of the incinerator;

The outlet end of the incinerator is provided with a temperature sensor for detecting the flue gas temperature at the outlet after incineration;

The controller is electrically connected with the temperature sensor, the air supply regulating valve, the flue gas combustion-supporting air regulating valve, and the supplementary air combustion-supporting air regulating valve, and is used to receive the outlet flue gas temperature detected by the temperature sensor , when the temperature of the flue gas at the outlet is lower than the set threshold, control to increase the opening degrees of the supplementary air regulating valve and the supplementary air combustion air regulating valve, or/and increase the flue gas combustion supporting air regulating valve When the outlet flue gas temperature is greater than the set threshold, control the opening of the supplementary air regulating valve and the supplementary air combustion air regulating valve, or/and reduce the combustion of the flue gas The opening of the air regulating valve.

Preferably, the incinerator is a vertical incinerator; the longitudinal section of the incinerator is square.

Preferably, the body of the incinerator adopts a structure of lining castable and insulation cotton.

Preferably, multiple temperature sensors are also provided in the incinerator.

Preferably, the outlet end of the incinerator is also equipped with a flue gas oxygen content detector.

Preferably, the supplementary gas is natural gas.

Preferably, the burner is a low nitrogen burner.

Preferably, the outlet end of the incinerator is connected to a waste heat boiler.

Preferably, the set threshold is 850-900°C.

Preferably, the residence time of the flue gas in the vertical incinerator is 1.5-2.5S.

In this application, by setting the four-corner tangential burner, it can ensure the rapid and full combustion of CO in the flue gas and the fixed carbon in the particulate matter, reduce the generation of CO and NOx, and set the SNCR (selective non-catalytic reduction) denitrification system, which can effectively denitrify, Remove the nitrogen oxides in the flue gas, through the controller, according to the temperature of the outlet flue gas, it can automatically adjust the intake of supplementary air and combustion-supporting air or the intake of flue gas combustion-supporting air, which further ensures that the flue gas is fully combusted and the combustion The CO and NOx contents in the flue gas meet the requirements.

Description of drawings

Fig. 1 is the structural representation of the CO treatment incinerator system provided by the present invention;

Fig. 2 is a schematic diagram of the layout of the four-corner tangential burner;

Fig. 3 is the thermodynamic field diagram in the incinerator;

Among them, 1-incinerator; 2-burner; 3-SNCR denitrification system; 5-temperature sensor; 6-flue gas oxygen content detector; 7-waste heat boiler.

Detailed ways

The present invention provides a CO treatment incinerator system, as shown in Figures 1-2, including an incinerator 1, a burner 2, an SNCR denitrification system 3 and a controller.

There are 4 burners, which are arranged around the inlet end of the incinerator in a four-corner tangent circle, and can be fixed on the furnace wall through bolts. When the 4 burners are installed, they form a certain tangent circle. The burner is preferably a low-nitrogen burner, which can reduce the output of nitrogen oxides.

The burner is provided with a flue gas inlet, a supplementary air intake, a supplementary gas regulating valve, a flue gas combustion-supporting air intake, a flue gas combustion-supporting air regulating valve, a gas-combustion-supporting air intake, and a gas-combustion-supporting air regulating valve. The make-up gas is preferably natural gas. In order to burn out the CO in the flue gas, a part of natural gas needs to be reburned and burned together with the flue gas as fuel. This application sets up separate flue gas inlets and supplementary air inlets, as well as corresponding combustion air inlets, and is equipped with corresponding regulating valves. The flue gas and supplementary air can be added separately, and the supplementary air can be adjusted according to the needs of combustion. (natural gas) and flue gas ratio. Supplementary air and flue gas combustion-supporting air also enter the incinerator through different inlets, which is more beneficial to the air-fuel ratio of the respective fuels.

When in use, first use natural gas to raise the temperature of the furnace to reach the temperature where CO in the flue gas can burn, and then pass in the flue gas. The flue gas and natural gas can enter the incinerator from the four burners through the gas distributor. A virtual tangential circle with a certain diameter is formed in the furnace, and it rotates and flows upward quickly. In a short time, the CO in the exhaust gas is completely reacted and the CO content in the exhaust gas is reduced. Moreover, since four burners are installed, the combustion can be distributed and the combustion temperature can be reduced, thereby reducing the generation of NOx.

The SNCR (Selective Non-Catalytic Reduction) denitrification system 3 is located between the inlet and outlet of the incinerator. SNCR is a method of reducing NOx in the range of 850-1100°C without catalyst. Therefore, the SNCR (Selective Non-Catalytic Reduction) denitrification system 3 is located in the range of 850-1100°C in the incinerator, and the reducing agent ammonia is injected during use. , the reducing agent rapidly thermally decomposes into NH ₃ , and performs SNCR reaction with NOx in the flue gas after combustion to generate N ₂ and H ₂ O, so as to achieve the purpose of denitrification and ensure that the NOx in the flue gas meets the emission standard.

The outlet end of the incinerator 1 is connected to the waste heat boiler 7, and the flue gas after combustion and denitrification still has a certain temperature, and is transported to the waste heat boiler to recover and utilize the waste heat.

There is also a temperature sensor 5 at the outlet of the incinerator, which is used to detect the temperature of the flue gas at the outlet after incineration. The temperature is controlled at 850-900°C. The CO content in the gas is relatively high. When the flue gas temperature is too high, it means that the flue gas is over-combusted, the energy consumption is too high, and there is a defect that the NOx content increases.

The controller is electrically connected with the temperature sensor, the air supply regulating valve, the flue gas combustion-supporting air regulating valve, and the air supply combustion-supporting air regulating valve, and is used to receive the outlet flue gas temperature detected by the temperature sensor. When the outlet flue gas temperature is lower than the set threshold, Control and increase the opening of the air supply regulating valve and the air supply combustion air regulating valve, or/and increase the opening of the flue gas combustion air regulating valve to increase the gas supply of natural gas, thereby increasing the temperature of the flue gas and making the flue gas Combustion is complete, reduce the CO content in the flue gas; when the outlet flue gas temperature is greater than the set threshold, control to reduce the opening of the air supply regulating valve and the air supply combustion air regulating valve, or/and reduce the combustion air of the flue gas Adjust the opening of the valve to reduce the NOx content in the flue gas and reduce energy consumption.

This application is equipped with a four-corner tangential burner, adjacent corners are heated and ignited, and the overall organization is combusted. The requirements for the uniformity of air and fuel distribution are low. Whether a single burner nozzle is in the best working condition has little impact on the overall combustion. It is conducive to burnout, and the heat load in the circumferential and height directions of the furnace is uniform, as shown in Figure 3. The fuel (flue gas and natural gas) of this application moves upward together with the air (combustion-supporting air) in the furnace, and each stage of combustion is carried out in a suspended state. short. Due to the arrangement of multiple burners, the load adjustment range of the incinerator is large, and can be adjusted within the range of 20% to 110% load, with stable operation and simple operation.

Therefore, by setting the four-corner tangential burner, the present application can ensure the rapid and full combustion of CO in the flue gas and the fixed carbon in the particulate matter, reduce the generation of CO and NOx, and set the SNCR (selective non-catalytic reduction) denitrification system, which can effectively Denitrification, removal of nitrogen oxides in the flue gas, through the controller, according to the outlet flue gas temperature, automatically adjust the intake of supplementary air and combustion-supporting air or the intake of flue gas combustion-supporting air, further ensuring that the flue gas is fully combusted , the CO and NOx contents in the flue gas after combustion meet the requirements. Through the incinerator system provided by this application, the CO concentration in the flue gas can be reduced to below 300mg/m ³ , the lowest can be reduced to 150-160mg/m ³ , and the NOx can be reduced to below 35mg/Nm ³ , the lowest can be reduced to 20mg/Nm ³ , meet the requirements.

Preferably, the controller, incinerator control, burner system control, and SNCR denitrification system control can be integrated into the DCS system for unified control, and the system equipment can be monitored on the DCS.

Preferably, the incinerator is a vertical incinerator, which adopts a vertical layout, occupies a small area, and can make full use of the site space, and the vertical furnace body is longer, which can prolong the residence time of the flue gas in the incinerator, and the residence time control 1.5 ~ 2.5S, so that CO is fully burned. The longitudinal section of the incinerator is square, and the square design is not only beautiful, but also meets the needs of combustion.

Preferably, the incinerator body is lined with castables and insulation cotton, which can effectively protect the structure of the furnace body, ensure the temperature in the furnace, ensure that CO burns in the incinerator, and reduce heat loss.

Preferably, the outlet end of the incinerator is also equipped with a flue gas oxygen content detector 6, which is used to detect the oxygen content in the flue gas after incineration. The oxygen content in the flue gas can also reflect the flue gas combustion state to a certain extent. The oxygen content is adjusted in time to the combustion status. In order to ensure the accuracy of measurement, there can be more than one flue gas oxygen content detector.

As those skilled in the art can understand, the incinerator is also equipped with temperature measuring points, oxygen measuring points, CEMS system (flue gas automatic monitoring system) CO concentration measuring points, NOx measuring points, etc., so that it can be intuitively reacted and monitored The combustion conditions in the incinerator can be adjusted in time to ensure that the content of combustion products meets the design requirements.

While preferred embodiments of the invention have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, it is intended that the appended claims be construed to cover the preferred embodiment as well as all changes and modifications which fall within the scope of the invention. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (10)

1. A CO treatment incinerator system is characterized by comprising an incinerator, a combustor, an SNCR denitration system and a controller;

the number of the burners is 4, and the burners are arranged on the periphery of the inlet end of the incinerator in a tangential manner at four corners; the combustor is provided with a flue gas inlet, an air supplementing regulating valve, a flue gas combustion-supporting air inlet, a flue gas combustion-supporting air regulating valve, an air supplementing combustion-supporting air inlet and an air supplementing combustion-supporting air regulating valve;

the SNCR denitration system is arranged between the inlet end and the outlet end in the incinerator;

the outlet end of the incinerator is provided with a temperature sensor for detecting the temperature of the flue gas at the outlet after incineration;

the controller is electrically connected with the temperature sensor, the air supply adjusting valve, the flue gas combustion-supporting air adjusting valve and the air supply combustion-supporting air adjusting valve and is used for receiving the outlet flue gas temperature detected by the temperature sensor, and when the outlet flue gas temperature is smaller than a set threshold value, the controller controls to increase the opening degrees of the air supply adjusting valve and the air supply combustion-supporting air adjusting valve or/and increases the opening degree of the flue gas combustion-supporting air adjusting valve; and when the outlet flue gas temperature is higher than a set threshold value, controlling to reduce the opening degrees of the air supply adjusting valve and the air supply combustion-supporting air adjusting valve or/and reducing the opening degree of the flue gas combustion-supporting air adjusting valve.

2. The CO remediation incinerator system of claim 1,

the incinerator is a vertical incinerator; the longitudinal section of the incinerator is square.

3. The CO abatement incinerator system of claim 1,

the incinerator body adopts a structure of lining castable and heat insulation cotton.

4. The CO abatement incinerator system of claim 1,

a plurality of temperature sensors are also arranged in the incinerator.

5. The CO abatement incinerator system of claim 1,

and a smoke oxygen content detector is also arranged at the outlet end of the incinerator.

6. The CO abatement incinerator system of claim 1,

the make-up gas is natural gas.

7. The CO remediation incinerator system of claim 1,

the combustor is a low-nitrogen combustor.

8. The CO abatement incinerator system of claim 1,

the outlet end of the incinerator is connected with a waste heat boiler.

9. The CO abatement incinerator system of claim 1,

the set threshold is 850-900 ℃.

10. The CO abatement incinerator system of claim 2,

the residence time of the flue gas in the vertical incinerator is 1.5-2.5S.

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