Flue gas treatment device utilizing flue gas waste heat of glass kiln

Abstract

The utility model discloses a flue gas treatment device utilizing flue gas waste heat of a glass kiln, which comprises the glass kiln, a waste heat boiler, an electrostatic dust collector, a heat exchanger, a wet desulphurization device, a low-temperature SCR (Selective Catalytic Reduction) denitration device, a carbon capture device and a chimney, a flue gas outlet of the glass kiln is communicated with a dust removal flue gas inlet of a heat exchanger through a waste heat boiler and an electrostatic dust collector which are communicated in sequence, a dust removal flue gas outlet of the heat exchanger is communicated with a flue gas inlet of a wet desulphurization device, and a flue gas outlet of the wet desulphurization device is communicated with a desulfurized flue gas inlet of the heat exchanger. Compared with the prior art, the system has the advantages that the service life of a catalyst is prolonged, the desulfurization efficiency is high, the running resistance is small, and the energy consumption is reduced.

Description

[Technical field]

[0001] The utility model relates to the technical field of flue gas purification, in particular to a flue gas treatment device utilizing the residual heat of glass kiln flue gas. [Background technology]

[0002] Combustion in a glass kiln will produce particulate matter, NOx, SO 2 , CO 2 The flue gas contains pollutants such as particulate matter, among which particulate matter is the main cause of poor air quality; NOX emissions are the main cause of ozone holes, photochemical smog, etc.; SO 2 The emission of CO is the main cause of acid rain; 2 The emission of carbon dioxide is the main cause of global warming. Therefore, it is imperative to treat the flue gas from glass kilns. Denitrification, desulfurization, dust removal and carbon capture of flue gas from glass kilns are treatment processes to reduce the emission of atmospheric pollutants and greenhouse gases and protect the environment and human health.

[0003] Compared with the flue gas treatment of thermal power plants, the flue gas purification and treatment of glass kilns is more difficult. From the ignition of the glass kiln, the kiln cannot be stopped during the general kiln life, and a continuous and uninterrupted production method is adopted. This assembly line production method determines the continuous operation characteristics of the glass kiln. The normal operation of the glass kiln needs to maintain a certain combustion atmosphere, and the flue gas pressure during production must be stable. Due to the fire change on both sides, the flue gas volume of the glass kiln fluctuates greatly.

[0004] The fuels for glass kilns are complex, mainly including coal gas, coke oven gas, natural gas, and some companies use coal tar. The amount of flue gas generated after combustion is huge. The exhaust temperature of glass melting furnaces is mostly 400-500℃. Among them, the SOx concentration in the flue gas is affected by factors such as the type of fuel and its sulfur content, the amount of sodium sulfate used in the raw material ingredients and the amount of flue gas generated when the fuel is burned. Its concentration range is generally 500-18000mg / Nm3; the NOx emitted by the glass kiln is mainly high-temperature thermal NOx. At the same time, the decomposition of raw materials also produces a certain amount of NOx. The NOx concentration in the flue gas at the outlet of the glass kiln is also very high, and its concentration range is generally 1200-3000mg / Nm3; the dust generated by the glass kiln has small particle size, fine dust, strong viscosity, and high alkali metal concentration, which can easily cause blockage and poisoning of the SCR denitrification catalyst, and has a great impact on the denitrification reaction; the flue gas emitted by the glass kiln needs to be recovered and treated by the waste heat boiler. The flue gas emission temperature is relatively high, and the outlet flue gas temperature is generally 400℃~500℃, and it is mostly equipped with a waste heat boiler. The existing glass fume treatment process includes: glass furnace - waste heat boiler - SCR denitrification - semi-dry desulfurization - bag dust removal - chimney emission. It has the following problems:

[0005] 1. SCR is located in high dust areas. The alkaline dust in the flue gas of the glass furnace has strong moisture absorption and high viscosity. The catalyst is easily blocked and worn, the amount of ammonia escape is large, and the service life of the catalyst is greatly reduced;

[0006] 2. Due to the characteristics of dust, conventional bags are prone to bagging and have high running resistance;

[0007] 3. If the working conditions are unstable, the temperature of the bag area may exceed the temperature, affecting the service life of the bag;

[0008] 4. After semi-dry desulfurization, the humidity of flue gas increases, which increases the stickiness of dust and easily causes bag-type dust collector to stick to the bag. The running resistance is large, the desulfurization efficiency is low, and it is difficult to adapt to high-sulfur fuel. [Utility Model Content]

[0009] The purpose of the utility model is to solve the problems in the prior art and to provide a flue gas treatment device that utilizes the waste heat of glass kiln flue gas, which can solve at least one of the above problems.

[0010] To achieve the above-mentioned purpose, the utility model proposes a flue gas treatment device utilizing the waste heat of flue gas from a glass kiln, comprising a glass kiln, a waste heat boiler, an electrostatic precipitator, a heat exchanger, a wet desulfurization device, a low-temperature SCR denitrification device, a carbon capture device and a chimney. The flue gas outlet of the glass kiln is connected to the dust removal flue gas inlet of the heat exchanger through the waste heat boiler and the electrostatic precipitator connected in sequence, the dust removal flue gas outlet of the heat exchanger is connected to the flue gas inlet of the wet desulfurization device, the flue gas outlet of the wet desulfurization device is connected to the desulfurization flue gas inlet of the heat exchanger, and the desulfurization flue gas outlet of the heat exchanger is connected to the chimney through the low-temperature SCR denitrification device and the carbon capture device connected in sequence.

[0011] Preferably, the wastewater outlet of the wet flue gas desulfurization device is connected to a desulfurization wastewater tank, the desulfurization wastewater tank is connected to a nozzle via a water pump, and a nozzle is provided on the inlet flue of the electrostatic precipitator.

[0012] Preferably, the heat exchanger is a GGH heat exchanger.

[0013] Preferably, the steam outlet of the waste heat boiler is connected to the carbon capture device through a steam pipeline to supply steam thereto.

[0014] Beneficial effects of the utility model: The utility model changes the bag dust removal process to the electrostatic dust removal process; changes the semi-dry desulfurization to the wet desulfurization and moves it behind the electrostatic dust removal; changes the SCR denitrification to the low-temperature SCR denitrification and moves it behind the wet desulfurization. Through the wet desulfurization, the washing and demisting of the flue gas solves the problems of strong moisture absorption and high viscosity of alkaline dust in the flue gas, easy clogging and wear of the catalyst, and low desulfurization efficiency; adds a carbon capture process after denitrification, inhibits the emission of greenhouse gas carbon dioxide, and exchanges heat between the flue gas after dust removal and the flue gas after desulfurization through the heat exchanger 4, saving a lot of energy consumption. Compared with the prior art, the service life of the catalyst is improved, the desulfurization efficiency is high, the operation resistance is small, and energy consumption is saved.

[0015] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings.

Brief Description of the Drawings

[0016] Figure 1 The utility model is a structural schematic diagram of a flue gas treatment device which utilizes the residual heat of glass kiln flue gas.

[0017] In the figure: 1-glass kiln, 2-waste heat boiler, 3-electrostatic precipitator, 4-heat exchanger, 5-wet desulfurization device, 6-low-temperature SCR denitrification device, 7-carbon capture device, 8-chimney, 9-steam pipe, 51-desulfurization wastewater tank, 52-water pump, 53-nozzle. [Specific implementation method]

[0018] See also Figure 1 The utility model discloses a flue gas treatment device utilizing waste heat of flue gas from a glass kiln, comprising a glass kiln 1, a waste heat boiler 2, an electrostatic precipitator 3, a heat exchanger 4, a wet desulfurization device 5, a low-temperature SCR denitration device 6, a carbon capture device 7 and a chimney 8. The flue gas outlet of the glass kiln 1 is connected to the dust removal flue gas inlet of the heat exchanger 4 through the waste heat boiler 2 and the electrostatic precipitator 3 connected in sequence, the dust removal flue gas outlet of the heat exchanger 4 is connected to the flue gas inlet of the wet desulfurization device 5, the flue gas outlet of the wet desulfurization device 5 is connected to the desulfurization flue gas inlet of the heat exchanger 4, and the desulfurization flue gas outlet of the heat exchanger 4 is connected to the chimney 8 through the low-temperature SCR denitration device 6 and the carbon capture device 7 connected in sequence.

[0019] The wastewater outlet of the wet desulfurization device 5 is connected to the desulfurization wastewater tank 51 , and the desulfurization wastewater tank 51 is connected to the nozzle 53 through a water pump 52 . The inlet flue of the electrostatic precipitator 3 is provided with a nozzle 53 .

[0020] The heat exchanger 4 is a GGH heat exchanger.

[0021] The steam outlet of the waste heat boiler 2 is connected to the carbon capture device 7 through a steam pipe 9 to supply steam thereto.

[0022] Working process of this utility model:

[0023] In the working process of the flue gas treatment device using the waste heat of flue gas from the glass kiln, the flue gas temperature generated in the glass kiln 1 is 400-500°C. After entering the waste heat boiler 2 through the flue, the flue gas temperature drops to about 300°C. The flue gas after cooling enters the electrostatic precipitator 3 through the flue for dust removal, and then enters the heat exchanger 4 and the wet desulfurization device 5 in sequence. Under the action of the heat exchanger 4, the heat of the high-temperature flue gas before desulfurization is used to heat the flue gas after desulfurization. The desulfurized flue gas heated by the heat exchanger 4 goes to the low-temperature SCR denitrification device 6 for flue gas denitrification. The flue gas after denitrification enters the carbon capture device 7 to remove carbon dioxide from the flue gas, and the final clean flue gas is discharged to the atmosphere through the chimney 8. In addition, the wastewater in the desulfurization wastewater tank 51 is transported to the nozzle 53 through the water pump 52, and the wastewater is sprayed into the flue in front of the electrostatic precipitator 3 for evaporation, thereby achieving the effect of zero wastewater discharge. The heat carried by the steam at the outlet of the waste heat boiler 2 is supplied to the carbon capture device 7 as a heat source for the desorption reaction, thus saving a lot of energy consumption.

[0024] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention falls within the protection scope of the present invention.

Claims

1. A flue gas treatment device utilizing the waste heat of glass kiln flue gas, characterized in that: The invention comprises a glass kiln (1), a waste heat boiler (2), an electrostatic precipitator (3), a heat exchanger (4), a wet desulfurization device (5), a low-temperature SCR denitration device (6), a carbon capture device (7) and a chimney (8); the flue gas outlet of the glass kiln (1) is connected to the dust removal flue gas inlet of the heat exchanger (4) through the waste heat boiler (2) and the electrostatic precipitator (3) which are connected in sequence; the dust removal flue gas outlet of the heat exchanger (4) is connected to the flue gas inlet of the wet desulfurization device (5); the flue gas outlet of the wet desulfurization device (5) is connected to the desulfurization flue gas inlet of the heat exchanger (4); and the desulfurization flue gas outlet of the heat exchanger (4) is connected to the chimney (8) through the low-temperature SCR denitration device (6) and the carbon capture device (7) which are connected in sequence.

2. A flue gas treatment device utilizing waste heat of glass furnace flue gas as claimed in claim 1, characterized in that: The wastewater outlet of the wet desulfurization device (5) is connected to a desulfurization wastewater tank (51), the desulfurization wastewater tank (51) is connected to a nozzle (53) via a water pump (52), and a nozzle (53) is provided on the inlet flue of the electrostatic precipitator (3).

3. The flue gas treatment device using waste heat of glass furnace flue gas as claimed in claim 1, characterized in that: The heat exchanger (4) is a GGH heat exchanger.

4. A flue gas treatment device utilizing waste heat of glass furnace flue gas as claimed in any one of claims 1 to 3, characterized in that: The steam outlet of the waste heat boiler (2) is connected to the carbon capture device (7) through a steam pipe (9) to supply steam thereto.

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