CN115501711A - Comprehensive treatment equipment for deep dust removal, desulfurization and denitrification of glass kiln flue gas - Google Patents

Abstract

The invention relates to the technical field of chemical purification of waste gas, in particular to comprehensive treatment equipment for deep dust removal and desulfurization and denitrification of flue gas from a glass kiln, including a detection module, which is used to obtain the dust of the flue gas at the flue gas outlet of the bag filter Concentration and send a concentration signal; recirculation module, the recirculation module is used to close the bag filter flue gas outlet and extract this part of the flue gas into the bag filter flue gas inlet for recirculation; ash cleaning module, the ash cleaning module is used Clean the dust on the filter bag of the bag filter; control module, the control module is used to obtain the concentration signal and close the recirculation module when the concentration signal value is lower than the first threshold value, and open the recirculation module when the concentration signal value is greater than the second threshold value. The circulation module and the dust cleaning module close the bag filter when the concentration signal value is greater than the third threshold. Compared with the traditional solution, the present invention solves the problem of excessively high dust concentration in the flue gas discharged from the bag filter during online cleaning.

Description

Comprehensive treatment equipment for deep dust removal, desulfurization and denitrification of glass kiln flue gas

technical field

The invention relates to the technical field of chemical purification of waste gas, in particular to comprehensive treatment equipment for deep dust removal, desulfurization and denitrification of flue gas from a glass kiln.

Background technique

The glass manufacturing industry uses glass furnaces to melt glass raw materials. The main fuels of glass furnaces are coal gas, natural gas, petroleum coke, heavy oil, etc. The exhaust gas temperature of combustion is 450-500 ° C. The pollutants include dust, SO ₂ NO _x etc. In order to meet the requirements of environmental protection, dust removal, desulfurization and denitrification must be carried out on the flue gas.

In the existing desulfurization, denitrification and dust removal process, there is a phenomenon that the concentration of flue gas and dust is too high, which causes the non-combustible substances and combustion products to form black smoke when the combustion is incomplete, and the black smoke contains a large amount of heavy metals that are harmful to the human body , so dust removal is a very important part.

At present, in the prior art, a bag filter is usually used for dust removal operations. The bag filter has a high purification efficiency for micron or submicron dust particles, and can achieve deep dust removal. The dust cleaning system of the bag filter is mainly composed of air compressor, fan, air bag, air pipe and electromagnetic valve. Each filter chamber is provided with a blowing pipe, and the blowing pipe is provided with a blowing port, which communicates with the electromagnetic pulse valve and compressed air. When cleaning the dust, the electromagnetic valve is opened, and the compressed air is sprayed to the filter bag, so that the filter bag shakes completely and forms a double-sided air flow to remove the smoke and dust on the surface of the filter bag to achieve the effect of cleaning.

However, during the long-term use of the bag filter, the pores of the filter bag will be blocked by fine dust, resulting in a decrease in the air permeability of the filter bag, and the concentration of flue gas and dust discharged during the online cleaning process is too high. Stopping the machine for dust cleaning will affect the work efficiency, and restarting the machine will consume a lot of energy. Therefore, we need a device that can solve the problem of excessive dust concentration in the flue gas discharged from the bag filter when cleaning dust online.

Contents of the invention

The invention provides comprehensive treatment equipment for deep dust removal, desulfurization and denitrification of flue gas from a glass kiln, and aims to solve the problem of excessive dust concentration in the flue gas discharged from a bag filter during online dust removal.

In order to achieve the above purpose, this program provides the following technical solutions:

Bag filter, the air inlet of the bag filter is connected to the glass furnace;

A detection module, the detection module is used to obtain the dust concentration of the flue gas at the flue gas outlet of the bag filter and send out a concentration signal;

Recirculation module, the recirculation module is used to close the flue gas outlet of the bag filter and extract this part of the flue gas into the flue gas inlet of the bag filter for recirculation;

Dust removal module, the dust removal module is used to clean the dust on the filter bag of the bag filter; the dust removal module includes a negative pressure fan, and the negative pressure fan is fixed inside the bag filter;

A control module, the control module is used to obtain the concentration signal and close the recirculation module when the concentration signal value is lower than the first threshold value, open the recirculation module and the ash cleaning module when the concentration signal value is greater than the second threshold value, and turn on the recirculation module and the ash cleaning module when the concentration signal value is greater than the second threshold value Turn off the bag filter at the third threshold.

The principle of this technical solution:

The flue gas passes through the flue gas exhaust port of the bag filter, the detection module obtains the dust concentration of the flue gas there and sends out a concentration signal, the control module obtains the concentration signal, and closes the recirculation module when the concentration signal value is lower than the first threshold, and turns on Bag filter flue gas exhaust port;

When the concentration signal value is greater than the second threshold, the recirculation module is turned on, and the recirculation module closes the flue gas outlet of the bag filter and extracts this part of the flue gas into the flue gas inlet of the bag filter for recirculation;

When the concentration signal value is greater than the third threshold, the bag filter is turned off.

Beneficial technical effects of this technical solution:

(1) Obtain the dust concentration of the flue gas at the flue gas outlet of the bag filter through the detection module and send out a concentration signal. The control module obtains the concentration signal. When the concentration signal value is lower than the first threshold value, it is judged that the dust concentration is normal. The circulation module opens the flue gas outlet of the bag filter, and the dust removal works normally;

(2) When the concentration signal value is greater than the second threshold, the control module determines that a large amount of dust has accumulated in the filter bag, and opens the recirculation module and the ash cleaning module. The recirculation module closes the flue gas outlet of the bag filter and extracts this part of the flue gas into the bag The flue gas inlet of the dust collector is recirculated, and the dust removal module cleans the dust on the filter bag, and the recirculation improves the dust removal efficiency when the dust removal efficiency of the equipment decreases;

(3) The control module shuts down the bag filter when the concentration signal value is greater than the third threshold, and shuts down the bag filter when it fails to avoid excessive discharge of dust concentration exceeding the standard, and it is also convenient for staff to overhaul.

This scheme uses the detection module to detect the dust concentration of the flue gas after dust removal in real time and sends out a concentration signal. After the control module obtains the concentration signal, it judges the working state of the bag filter according to the range of the concentration signal value, and realizes that the concentration signal value is low. At the first threshold, it is determined that the dust concentration is normal, close the recirculation module, open the flue gas outlet of the bag filter, and the dust removal works normally. When the concentration signal value is greater than the second threshold, it is determined that the dust attached to the dust bag is too thick , open the recirculation module and the dust removal module, the recirculation treatment module recirculates the flue gas that does not meet the standard to achieve the discharge of the flue gas that meets the standard, and the dust removal module cleans the dust accumulated on the filter bag, so as to achieve the effect of deep dust removal. When the concentration signal value is greater than the third threshold, it is judged that the filter bag is damaged or has a serious failure, and the bag filter is closed to facilitate maintenance by the staff.

Further, it also includes a limestone-gypsum flue gas desulfurization system, the limestone-gypsum flue gas desulfurization system is arranged after the flue gas exhaust port of the bag filter; the limestone-gypsum flue gas desulfurization system includes a reaction tower, and the reaction tower There is also a detergent that flows from top to bottom.

Beneficial effects: the limestone-gypsum flue gas desulfurization system performs desulfurization treatment on the flue gas after dust removal, and realizes the control of sulfide in the flue gas.

Further, it also includes SCR denitration equipment, and the SCR denitration equipment is arranged after the flue gas exhaust port of the limestone-gypsum flue gas desulfurization system.

Beneficial effects: the nitrogen oxides in the flue gas react with the selective catalytic action of the reducing agent (ammonia) catalyst to produce non-polluting nitrogen and water, and the flue gas is denitrified to reduce the harmfulness of the flue gas .

Further, a buzzer is also included, and the control module controls the buzzer to activate the buzzer sound and electrical signal when the concentration signal value is greater than the second threshold.

Beneficial effect: when the smoke dust concentration exceeds the standard, the staff is warned in time, which is simple and effective.

Further, it also includes conductive material, and the conductive material is fixedly connected to the shell of the bag filter.

Beneficial effect: eliminate static electricity and avoid risks.

Further, a recording module is also included, and the recording module is used to record the cleaning time of the bag filter.

Beneficial effect: the dust cleaning time of the bag filter in the actual dust removal process is recorded, which is convenient for setting the dust cleaning cycle.

Further, it also includes a temperature measurement module. The temperature measurement module is used to measure the flue gas temperature at the air inlet of the bag filter and send out a temperature signal.

Beneficial effects: detect the temperature of the flue gas at the inlet of the bag filter, close the smart valves of the flue gas inlet of the bag filter and the flue gas outlet of the combustion chamber when the air temperature exceeds the high temperature threshold, and continuously feed gas into the external preheating pipe, Reduce the temperature of the flue gas in the high-temperature pipe to meet the temperature requirements of the filter bag of the bag filter; when the temperature signal value is lower than the low-temperature threshold, close the intelligent valve of the preheating air nozzle to reduce the heat dissipation of the flue gas in the high-temperature pipe and avoid The bag filter condenses.

Further, it also includes a liquid storage tank, the liquid storage tank is filled with a defoamer, the liquid storage tank is connected with a conduit, and the other end of the conduit is connected to the position where the reaction tower is used to store the detergent. An electric control valve is fixed in the conduit;

The outer wall of the rotating shaft of the negative pressure fan has a number of bumps arranged at equal intervals along the circumference, and the negative pressure fan is fixed above the rotating shaft with a contact switch that cooperates with the bumps, and the trigger switch is used to control the electric control. The opening and closing of the valve; the contact switch is in the closed state when it is not in contact, and the contact switch is in the open state when the bump is in conflict.

Beneficial effect: during the rotation process of the negative pressure fan, the bumps will sequentially pass through the upper contact switches one by one. Whenever a bump passes the contact switch, the trigger switch is triggered to open. Every time the electronically controlled valve is opened, a small amount of defoamer can be circulated to the detergent stored in the reaction tower, and then a small amount of defoamer can be added multiple times to reduce foam, improve the efficiency of slurry flow and ash removal Effect.

Further, the defoamer is a silicone defoamer.

Description of drawings

Fig. 1 is a logical block diagram of a comprehensive processing equipment for deep dust removal, desulfurization and denitrification of flue gas from a glass kiln according to Embodiment 1 of the present invention;

Fig. 2 is a partial schematic diagram of a negative pressure fan according to Embodiment 2 of the present invention.

detailed description

Further detailed explanation through specific implementation mode below:

The marks in the accompanying drawings of the description include: a rotating shaft 1, a bump 2, and a contact switch 3.

Embodiment one

As shown in Figure 1 below:

Comprehensive treatment equipment for deep dust removal, desulfurization and denitrification of glass kiln flue gas, including:

The bag filter, the air inlet of the bag filter is connected to the glass furnace, and the bag filter is used to filter the flue gas discharged from the glass furnace. The iron ring bolted on the shell of the bag filter is covered with an iron chain, and the iron chain touches the ground to achieve the effect of eliminating static electricity and eliminate static electricity hazards.

The detection module is used to obtain the dust concentration of the flue gas at the flue gas outlet of the bag filter and send out a concentration signal. The detection module can use HRYC series electrostatic charge induction bag leak detector, and the probe of the bag leak detector is fixed at the flue gas exhaust port of the bag filter. The bag leak detector is set with a first threshold, a second threshold and a third threshold, where the first threshold is 20 mg/m3, the second threshold is 28 mg/m3, and the third threshold is 40 mg/m3.

The recirculation module, the recirculation module is used to close the flue gas outlet of the bag filter and extract this part of the flue gas into the flue gas inlet of the bag filter for recirculation. The recirculation module can include a circulation pipeline, one end of the circulation pipeline is connected to the air inlet of the bag filter, and the other end of the circulation pipeline is connected to the exhaust port of the bag filter. The flue gas outlet of the bag filter and the end of the circulation pipe near the flue gas outlet are respectively fixed with a first valve and a second valve. The first valve is used to open or close the flue gas outlet, and the second valve is used to Open or close the end of the circulation pipe near the flue gas exhaust port.

The dust removal module, the dust removal module is used to clean the dust on the filter bag of the bag filter. The dust cleaning module includes a negative pressure fan, which is fixed inside the bag filter. The negative pressure fan can reversely blow the bag filter, and the negative pressure fan can deform and vibrate the bag in the bag filter through reverse blowing, so as to shake off the dust accumulated on the surface of the bag and restore the filter function of the bag.

Temperature measurement module, the temperature measurement module is used to measure the flue gas temperature at the air inlet of the bag filter and send out a temperature signal. The temperature measurement module can use NTC thermistor temperature sensor. The temperature sensor is embedded and fixed on the inner wall of the air inlet of the bag filter, and the temperature measuring probe of the temperature sensor extends at the air inlet of the bag filter.

A control module, the control module is used to obtain the concentration signal of the bag leak detector, and when the concentration signal value is lower than the first threshold, the control module controls the opening of the first valve and closes the second valve.

When the concentration signal value is greater than the second threshold, the first valve is controlled to be closed, while the second valve is controlled to be opened, and the negative pressure fan of the dust cleaning module is started.

When the value of the concentration signal is greater than the third threshold, the control module shuts down the control of the glass furnace.

It also includes a buzzer, which is fixed on the outer wall of the bag filter. The control module controls the buzzer to start buzzing an audible and electrical signal when the concentration signal value is greater than the second threshold.

Limestone-gypsum flue gas desulfurization system, the limestone-gypsum flue gas desulfurization system is set at the flue gas outlet of the bag filter. The limestone-gypsum flue gas desulfurization system includes a reaction tower, the flue gas in the reaction tower flows from bottom to top, and there is also a detergent in the reaction tower that flows from top to bottom, and the detergent is limestone (CaCO3) slurry. A nozzle is fixed in the reaction tower, and the nozzle sprays the detergent from the top of the reaction tower.

SCR denitrification equipment, SCR denitrification equipment is installed after the flue gas exhaust port of the limestone-gypsum flue gas desulfurization system. The SCR denitrification equipment includes a catalytic reactor. The catalytic reactor is equipped with a catalyst and a reducing agent. The reducing agent can be liquid ammonia. Next, the NOX in the flue gas is selectively reduced to non-toxic and non-polluting N2 and H2O by using a reducing agent.

The specific implementation process is as follows:

The flue gas discharged from the glass kiln first enters from the flue gas inlet of the bag filter. After the flue gas enters through the air inlet of the bag filter, it flows upwards. After being filtered by the filter bag, the dust is trapped outside the filter bag. On the surface, the purified gas enters the upper box through the filter bag mouth and is discharged from the flue gas exhaust port.

The detection module obtains the dust concentration of the flue gas at this place and sends out a concentration signal. The control module obtains the concentration signal from the bag leak detector, and the concentration signal value is 28 mg/m3. The ash module and the recirculation module close the flue gas outlet of the bag filter and extract this part of the flue gas into the flue gas inlet of the bag filter for recirculation. The ash cleaning module adopts the existing compressed air low-pressure pulse ash cleaning system. After starting, shake the filter bag continuously to achieve a good dust removal effect.

The recording module records the cleaning time, which is convenient for adjusting the automatic cleaning cycle according to the actual data. The recording module adopts an electronic timer, which is connected in series with the negative pressure fan of the dust cleaning module, and the timer performs a timing function when it is powered on.

When the concentration signal value is 40 mg/m3, the control module determines that the bag filter is faulty, closes the bag filter, and turns on the buzzer to avoid excessive discharge of smoke with a dust concentration exceeding the standard, and warn the staff, so that the staff can carry out timely monitoring. Overhaul to avoid further damage to the equipment.

The limestone-gypsum flue gas desulfurization system is installed behind the flue gas outlet of the bag filter to desulfurize the flue gas after deep dust removal, and wash the flue gas in the reaction tower to remove SO2 in the flue gas and desulfurize The efficiency is as high as 95%. After the desulfurization process, the flue gas enters the SCR denitrification equipment. Under the action of the catalyst, the reducing agent is used to selectively reduce the NOX in the flue gas to non-toxic and pollution-free N2 and H2O. The denitrification effect excellent.

This program combines bag filter, limestone-gypsum flue gas desulfurization system and SCR denitrification equipment to carry out comprehensive treatment of glass kiln flue gas deep dust removal and desulfurization and denitrification, and uses the detection module to detect the dust concentration of the exhausted flue gas in real time And send a concentration signal, after the control module obtains the concentration signal, it judges the working state of the bag filter according to the interval of the concentration signal value;

Realize that the dust concentration is normal when the concentration signal value is lower than the first threshold, close the recirculation module, open the flue gas exhaust port of the bag filter, and the dust removal work runs normally.

When the concentration signal value is greater than the second threshold, it is determined that the dust attached to the dust bag is too thick, the recirculation module and the ash cleaning module are turned on, and the recirculation processing module recirculates the non-standard flue gas to achieve the emission of standard flue gas. The dust cleaning module cleans the dust accumulated on the filter bag, so as to achieve the effect of deep dust removal, and solve the problem of excessive dust concentration in the flue gas discharged from the bag filter when cleaning dust online.

When the concentration signal value is greater than the third threshold, it is determined that the filter bag is damaged or has a serious failure, and the control module controls to shut down the bag filter, which is convenient for the staff to overhaul.

Embodiment two

The difference between this embodiment and Embodiment 1 is that, as shown in Figure 2, a liquid storage tank is also provided in the reaction tower, and the liquid storage tank is filled with a silicone defoamer. The liquid storage tank is connected with a conduit, and the other end of the conduit is connected to the position where the detergent is stored in the reaction tower. An electric control valve is fixed in the conduit.

The outer wall of the rotating shaft 1 of the negative pressure fan has a plurality of protrusions 2 arrayed at equal intervals along the circumferential direction. A contact switch 3 cooperating with the bump 2 is provided above the rotating shaft 1 of the negative pressure fan, and the contact switch 3 is fixedly connected to the inner wall of the negative pressure fan. The bump 2 can touch the contact switch 3 at the highest point during the rotation. The contact switch 3 is in the closed state when not in contact, and the contact switch 3 is in the open state when the bump 2 collides. The contact switch 3 is used to control the opening and closing of the electronically controlled valve.

The specific implementation process is as follows: during the rotation of the negative pressure fan, the bumps 2 will successively pass through the contact switches arranged on the top one by one. Whenever a bump 2 passes the contact switch, the trigger switch 3 will be triggered to open once. Every time the electronically controlled valve is opened, a small amount of defoamer can be circulated to the detergent stored in the reaction tower, and then a small amount of defoamer can be added multiple times to reduce foam, improve the efficiency of slurry flow and ash removal Effect.

What is described above is only an embodiment of the present invention, and common knowledge such as specific structures and characteristics known in the scheme are not described here too much. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, some modifications and improvements can also be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation of the present invention. Effects and utility of patents. The scope of protection required by this application shall be based on the content of the claims, and the specific implementation methods and other records in the specification may be used to interpret the content of the claims.

Claims (8)

1. Comprehensive treatment equipment for deep dust removal, desulfurization and denitrification of glass kiln flue gas is characterized by comprising:

the air inlet of the bag-type dust collector is communicated with the glass kiln;

the detection module is used for acquiring the dust concentration of the flue gas at the flue gas exhaust port of the bag-type dust remover and sending a concentration signal;

the recycling module is used for closing the flue gas exhaust port of the bag-type dust collector and pumping the part of flue gas into the flue gas inlet of the bag-type dust collector for recycling;

the dust cleaning module is used for cleaning dust adhered to a filter bag of the bag-type dust collector; the ash removal module comprises a negative pressure fan, and the negative pressure fan is fixed inside the bag-type dust remover;

and the control module is used for acquiring the concentration signal, closing the recirculation module when the concentration signal value is lower than a first threshold value, opening the recirculation module and the ash removal module when the concentration signal value is greater than a second threshold value, and closing the bag-type dust collector when the concentration signal value is greater than a third threshold value.

2. The glass kiln flue gas deep dedusting and desulfurization and denitrification comprehensive treatment equipment as claimed in claim 1, is characterized in that: the limestone-gypsum flue gas desulfurization system is arranged behind a flue gas exhaust port of the bag-type dust collector; the limestone-gypsum flue gas desulfurization system comprises a reaction tower, and a detergent flowing from top to bottom is also arranged in the reaction tower.

3. The glass kiln flue gas deep dedusting, desulfurization and denitrification comprehensive treatment equipment according to claim 2 is characterized in that: the system also comprises SCR denitration equipment, wherein the SCR denitration equipment is arranged behind a flue gas exhaust port of the limestone-gypsum flue gas desulfurization system.

4. The glass kiln flue gas deep dedusting and desulfurization and denitrification comprehensive treatment equipment as claimed in claim 1, is characterized in that: the control module is used for turning on the buzzer when the concentration signal value is larger than a second threshold value.

5. The glass kiln flue gas deep dedusting and desulfurization and denitrification comprehensive treatment equipment as claimed in claim 1, is characterized in that: the bag-type dust collector further comprises a conductive material, and the conductive material is fixedly connected with the shell of the bag-type dust collector.

6. The glass kiln flue gas deep dedusting and desulfurization and denitrification comprehensive treatment equipment as claimed in claim 1, is characterized in that: the recording module is connected in series with the dust cleaning module and is used for recording the dust cleaning time of the bag-type dust remover.

7. The glass kiln flue gas deep dedusting and desulfurization and denitrification comprehensive treatment equipment as claimed in claim 2, is characterized in that: the device is characterized by also comprising a liquid storage tank, wherein the liquid storage tank is filled with a defoaming agent, the liquid storage tank is communicated with a guide pipe, the other end of the guide pipe is communicated with the position of the reaction tower for storing the detergent, and an electric control valve is fixed in the guide pipe;

the outer wall of the rotating shaft of the negative pressure fan is provided with a plurality of convex blocks in an array at equal intervals along the circumferential direction, a contact switch matched with the convex blocks is fixed above the rotating shaft of the negative pressure fan, and the trigger switch is used for controlling the opening and closing of the electric control valve; the contact switch is in a closed state under the condition of no contact, and the contact switch is in an open state in the process of the bump conflict.

8. The glass kiln flue gas deep dedusting, desulfurization and denitrification comprehensive treatment equipment according to claim 7, is characterized in that: the defoaming agent is an organic silicon defoaming agent.

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