Chemical waste gas and waste liquid combined incineration device

Abstract

This invention discloses a combined incineration device for chemical waste gas and waste liquid, comprising a waste gas treatment system and a waste liquid treatment system. The waste gas treatment system includes a waste heat recovery device and a waste gas incinerator connected sequentially through a waste gas inlet pipeline. The waste gas incinerator includes an upstream incineration flue gas inlet. The waste liquid treatment system includes a waste liquid incinerator. The waste liquid incinerator includes a temperature-controlled waste gas inlet, which is connected to the high-temperature section of the waste gas pipeline through a temperature-controlled waste gas pipeline. The flue gas outlet of the waste liquid incinerator is connected to the upstream incineration flue gas inlet. Its advantages are: 1) It can simultaneously treat waste gas and waste liquid and recover and utilize the heat generated after incineration (calculations show that it can reduce auxiliary fuel consumption by about 90% compared to treating the same amount of waste gas and waste liquid separately), minimizing operating costs. 2) It can treat ultra-large capacity waste gas. 3) It has a simple structure, is easy to maintain, and is safe and reliable in operation.

Description

Technical Field

[0001] The invention relates to chemical production equipment, in particular to waste gas and waste liquid incineration equipment. Background Art

[0002] Industries such as petroleum, chemical, building materials, printing and dyeing, and biopharmaceuticals generate a large amount of waste gas and waste liquid in some production processes. These gases or liquids contain some flammable components or harmful substances. If these substances are directly discharged into the environment, it will not only cause energy waste, but also pollute the environment.

[0003] At present, the main treatment methods for organic waste are activated carbon adsorption treatment technology and combustion treatment technology. Among them, the treatment effect of activated carbon adsorption technology is not good, the adsorption capacity decays quickly, and the activated carbon needs to be replaced frequently. The replacement process is still difficult to avoid the release of VOCs. The replaced waste activated carbon is a hazardous waste material and needs to be registered and filed, stored in a hazardous waste warehouse, and entrusted to a qualified unit for treatment. The process and procedures are cumbersome, which increases the difficulty of management. Combustion treatment technology is divided into direct-fired incinerator (TO furnace), regenerative incinerator (RTO), and regenerative catalytic combustion furnace (RCO). Among these three heat treatment methods, TO furnace has good operation stability and large processing energy, but it only treats waste gas and waste liquid, and cannot recycle heat, which consumes a lot of energy and has high operating costs; RTO furnace can recycle heat to reduce energy consumption, but the core equipment of RTO furnace, the regenerative honeycomb ceramic, has a limited life, and its reversing valve is also prone to failure. After long-term operation, the reliability will be seriously reduced, and its processing capacity per unit time is also limited; the catalyst in the RCO furnace needs to be replaced regularly, and the operation economy is not high. Moreover, the RTO furnace and the RCO furnace can only treat waste gas but not waste liquid. Summary of the invention

[0004] In view of the above-mentioned problems existing in the existing process waste gas and waste liquid treatment methods, the present invention provides a chemical waste gas and waste liquid combined incineration device with low operating cost, large processing capacity, high safety and long-term stable operation.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a chemical waste gas and waste liquid combined incineration device, including a waste gas treatment system and a waste liquid treatment system;

[0006] The exhaust gas treatment system comprises a waste heat recovery device and a waste gas incinerator which are sequentially connected through an exhaust gas intake pipeline; the portion where the exhaust gas intake pipeline is connected to the high-temperature exhaust gas outlet of the waste heat recovery device is a high-temperature section of the exhaust gas pipeline; the exhaust gas incinerator comprises an upstream incineration flue gas inlet;

[0007] The waste liquid treatment system includes a waste liquid incinerator; the waste liquid incinerator includes a temperature-controlled waste gas inlet, which is connected to the high-temperature section of the waste gas pipeline through a temperature-controlled waste gas pipeline; the flue gas outlet of the waste liquid incinerator is connected to the upstream incineration flue gas inlet.

[0008] Since the treatment temperature of waste liquid is much higher than that of waste gas (usually 1100℃ for waste liquid and 850℃ for waste gas), the existing treatment scheme is usually to treat waste gas and waste liquid separately; if the same incinerator is used to treat waste gas and waste liquid at the same time, a higher incineration temperature needs to be selected, and the amount of auxiliary fuel input will increase significantly, which will consume greater treatment costs. Therefore, how to reduce the amount of auxiliary fuel used in the treatment of waste gas and waste liquid is a major problem in this field.

[0009] The present invention innovatively proposes to use the same combined incineration device to simultaneously treat waste liquid and waste gas, but independent incineration zones are set up for waste gas and waste liquid respectively, and at the same time, the waste liquid incineration zone and the waste gas incineration zone are interconnected, so that although the waste gas and waste liquid are treated in the same device, the treatment paths they pass through are both different and closely related. The different reaction temperatures (such as 850°C and 1100°C) and the flue gas residence times required for different reactions can be achieved through the treatment in different incineration zones, and the incineration heat generated by each treatment path can be utilized at the same time. This not only ensures the purification rate of waste gas and waste liquid, but also greatly reduces the consumption of auxiliary fuel.

[0010] As a further improvement of the present invention, the exhaust gas incinerator outlet section of the exhaust gas incinerator is connected to the heat exchange flue gas inlet of the waste heat recovery device, and the heat exchange flue gas outlet of the waste heat recovery device is connected to the chimney. In this scheme, the exhaust gas to be treated and the high-temperature flue gas after treatment are preheated and cooled respectively after heat exchange in the waste heat recovery device, realizing the recycling and utilization of heat, thereby further reducing the auxiliary fuel consumption.

[0011] As a further improvement of the present invention, a shutoff damper for cutting off the exhaust gas transmission and an exhaust pipeline for discharging the exhaust gas when the shutoff damper is closed are provided on the high temperature section of the exhaust gas pipeline. To ensure the safe operation of the device, the damper door can be closed in an emergency to cut off the exhaust gas source, and the exhaust gas can be discharged into the air through the exhaust pipeline to ensure safety.

[0012] As a further improvement of the present invention, a waste gas regulating baffle capable of adjusting the waste gas flow entering the waste liquid incinerator is provided on the high temperature section of the waste gas pipeline to adjust and control the amount of temperature-regulated waste gas entering the waste liquid incinerator.

[0013] As a further improvement of the present invention, the waste liquid incinerator is lined with a waste liquid incinerator castable; the waste gas incinerator is lined with a waste gas incinerator castable. The castable can protect the waste liquid incinerator and the waste gas incinerator from withstanding high temperature flue gas of 1100°C and 850°C respectively, and avoid over-temperature burning of the metal outer wall.

[0014] As a further improvement of the present invention, the furnace wall of the waste gas incinerator is arranged with an auxiliary fuel burner for conveying auxiliary fuel to the furnace. The heat required for pyrolysis is supplemented by the auxiliary fuel burner, and the combustion temperature in the waste gas incinerator can be controlled by adjusting the output of the auxiliary fuel burner to meet the purification temperature condition of more than 850°C. The burners can be arranged along the circumference of the incinerator, and can be single-layer or multi-layer. The number will be combined and arranged according to the supplementary fuel situation, so as to further enhance the turbulent mixing of high-temperature flue gas in the furnace.

[0015] As a further improvement of the present invention, a temperature regulating air duct is provided at the flue gas outlet of the waste gas incinerator for regulating the outlet flue gas temperature. The temperature regulating air duct is used to control the temperature of the flue gas at the outlet of the waste gas incinerator. If the temperature exceeds the design temperature, the temperature regulating air is mixed in to cool it down, so as to avoid problems such as overheating of the waste heat recovery device.

[0016] As a further improvement of the present invention, the waste gas incinerator also includes a Venturi rectifying device and a middle partition wall for promoting turbulent mixing of high-temperature flue gas in the furnace, so as to make the reaction of combustible waste gas and waste liquid in the furnace more complete.

[0017] The beneficial effects of the present invention are: 1) The present invention can simultaneously treat waste gas and waste liquid and recycle the heat generated after their incineration (according to calculations, the auxiliary fuel consumption can be reduced by about 90% compared with treating the same amount of waste gas and waste liquid separately), thus reducing the operating cost to the greatest extent, and ultimately achieving safe, reliable and efficient clean purification of waste gas and waste liquid, which is particularly suitable for the comprehensive treatment of waste gas and waste liquid generated in chemical processes. 2) The present invention can treat ultra-large-capacity waste gas, while a conventional RTO furnace can only treat 200,000 Nm 3 / h waste gas and cannot process waste liquid, while the present invention can process waste gas with a flow rate greater than 300000Nm 3 / h of waste gas. 3) Simple structure, easy maintenance, no wearing parts in RTO furnace or continuous consumption parts in RCO or adsorption method, safe and reliable operation and good control of maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention.

[0019] Marked in the figure: 1-waste gas inlet pipeline, 11-waste gas pipeline low temperature section, 12-waste gas pipeline high temperature section, 13-emptying pipeline, 14-shutoff baffle, 15-temperature regulating waste gas pipeline, 17-waste gas regulating baffle, 18-temperature measuring point of waste gas pipeline high temperature section, 2-waste liquid incinerator, 21-waste liquid incinerator castable, 22-waste liquid burner, 23-waste liquid incinerator temperature measuring point, 3-waste gas incinerator, 31-waste gas incinerator castable, 32-auxiliary fuel burner, 33-Venturi rectifier, 34-middle partition wall, 35-waste gas incinerator combustion section temperature measuring point, 36-waste gas incinerator outlet section temperature measuring point, 37-waste gas incinerator outlet section, 38-upstream combustion flue gas inlet, 4-temperature regulating air pipeline, 5-waste heat recovery device, 6-chimney. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0021] like Figure 1 As shown, the chemical waste gas and waste liquid combined incineration device of the present invention includes a waste gas treatment system and a waste liquid treatment system;

[0022] The waste gas treatment system includes a waste heat recovery device 5 and a waste gas incinerator 3 which are connected in sequence through a waste gas intake pipeline 1; the part of the waste gas intake pipeline 1 connected to the high-temperature waste gas outlet of the waste heat recovery device 5 is the waste gas pipeline high-temperature section 12; the waste gas incinerator 3 includes an upstream incineration flue gas inlet 38; the waste gas incinerator outlet section 37 of the waste gas incinerator 3 is connected to the heat exchange flue gas inlet of the waste heat recovery device 5, and the heat exchange flue gas outlet of the waste heat recovery device 5 is connected to the chimney 6. A shutoff damper 14 for cutting off the exhaust gas delivery and an exhaust pipeline 13 for discharging the exhaust gas when the shutoff damper 14 is closed are provided on the high-temperature section 12 of the exhaust gas pipeline; a temperature-regulating air pipeline 4 for regulating the outlet flue gas temperature is provided at the flue gas outlet end of the exhaust gas incinerator 3; an auxiliary fuel burner 32 for conveying auxiliary fuel to the furnace is arranged on the furnace wall of the exhaust gas incinerator 3; the exhaust gas incinerator 3 is lined with an exhaust gas incinerator castable 31; the exhaust gas incinerator 3 also includes a Venturi rectifier 33 and a middle partition wall 34 for promoting turbulent mixing of high-temperature flue gas in the furnace.

[0023] The waste liquid treatment system includes a waste liquid incinerator 2; the waste liquid incinerator 2 includes a temperature-controlled waste gas inlet, which is connected to the high-temperature section 12 of the waste gas pipeline through a temperature-controlled waste gas pipeline 15; the flue gas outlet of the waste liquid incinerator 2 is connected to the upstream incineration flue gas inlet 38; the high-temperature section 12 of the waste gas pipeline is provided with a waste gas regulating baffle 17 capable of adjusting the waste gas flow rate entering the waste liquid incinerator 2; the waste liquid incinerator 2 is lined with a waste liquid incinerator castable 21.

[0024] During operation, the exhaust gas inlet pipeline 1 is used for exhaust gas transportation. The low-temperature exhaust gas to be treated enters the waste heat recovery device 5 through the low-temperature section 11 of the exhaust gas pipeline, and then performs heat exchange with the high-temperature flue gas after treatment, and then completes preheating and cooling respectively, realizing the recycling and utilization of heat, thereby reducing the auxiliary fuel consumption. The high-temperature section 12 of the exhaust gas pipeline is provided with an exhaust pipeline 13 and a shut-off damper door 14. In an emergency, the shut-off damper door 14 can be closed to cut off the exhaust gas source, and the exhaust pipeline 13 can be opened to discharge the exhaust gas to the air to ensure operational safety. A part of the exhaust gas can enter the waste liquid incinerator 2 through the temperature-adjusting exhaust gas pipeline 15 to reduce the temperature of the high-temperature flue gas generated after the combustion of the waste liquid. The exhaust gas regulating damper 17 of the exhaust gas flow rate on the high-temperature section 12 of the exhaust gas pipeline can adjust and control the amount of temperature-adjusting exhaust gas entering the waste liquid incinerator 2. The high-temperature section temperature measuring point 18 of the exhaust gas pipeline is set on the high-temperature section 12 of the exhaust gas pipeline at the outlet of the waste heat recovery device 5 to monitor whether the exhaust gas reaches the required preheating temperature.

[0025] The waste heat recovery device 5 is connected to the waste gas inlet pipeline 1 and the waste gas incinerator outlet section 37 respectively. After the waste gas is preheated by the waste heat recovery device 5, it enters the waste gas incinerator 3 and the waste liquid incinerator 2 through the high temperature section 12 of the waste gas pipeline. After high-temperature oxidation in the process of passing through the furnace body, it enters the waste heat recovery device 5 for heat exchange and cooling and is discharged through the chimney 6.

[0026] The waste liquid incinerator 2 is used to treat the waste liquid separately so that the combustion temperature of the waste liquid reaches 1100°C. The waste liquid incinerator 2 is lined with a waste liquid incinerator castable 21 to protect the waste liquid incinerator 2 from withstanding the high temperature flue gas of 1100°C and avoid over-temperature burning of the metal outer wall. The waste liquid enters the waste liquid incinerator 2 through the waste liquid burner 22 for incineration. Since the waste liquid is generally a hydrocarbon and has a high theoretical combustion temperature, a temperature-adjusting waste gas pipeline 15 is provided to lead a certain amount of waste gas into the waste liquid incinerator 2 to reduce the temperature of the flue gas generated to the incineration treatment temperature of 1100°C. While achieving effective treatment of the waste liquid, it also protects the castable. A waste liquid incinerator temperature measuring point 23 is provided on the body of the waste liquid incinerator 2 to monitor whether the reaction temperature in the waste liquid incinerator meets the waste liquid purification requirements.

[0027] After the waste gas enters the waste gas incinerator 3, it is first mixed with the high-temperature flue gas generated in the waste liquid incinerator 2, and then passes through the auxiliary fuel burner 32 to supplement the heat required for its pyrolysis. The combustion temperature in the waste gas incinerator 3 can be controlled by adjusting the output of the auxiliary fuel burner 32 to meet the purification temperature condition greater than 850°C. The waste gas incinerator 3 is lined with a waste gas incinerator castable 31 so that it can withstand the high-temperature flue gas of 850°C and avoid over-temperature burning of the metal outer wall. The waste gas incinerator 3 is provided with a waste gas incinerator incineration section temperature measuring point 35, and the outlet is provided with a waste gas incinerator outlet section temperature measuring point 36, which is used to monitor whether the reaction temperature in the waste gas incinerator 3 meets the waste gas purification requirements. A temperature regulating air pipeline 4 is also provided at the outlet of the waste gas incinerator 3 to control the temperature of the waste gas incinerator outlet. If it exceeds the design temperature, the temperature regulating air is mixed in to cool down to avoid causing problems such as overheating of the waste heat recovery device 5. The waste gas incinerator 3 is also provided with a venturi rectifying device 33 and a middle partition wall 34, which are used to promote turbulent mixing of high-temperature flue gas in the furnace, so that the reaction of combustible waste gas and waste liquid in the furnace is more complete.

Claims

1. Chemical waste gas and waste liquid combined incineration device, characterized by: Including waste gas treatment system and waste liquid treatment system; The waste gas treatment system comprises a waste heat recovery device (5) and a waste gas incinerator (3) which are connected in sequence via a waste gas intake pipeline (1); the portion of the waste gas intake pipeline (1) connected to the high-temperature waste gas outlet of the waste heat recovery device (5) is a waste gas pipeline high-temperature section (12); the waste gas incinerator (3) comprises an upstream incineration flue gas inlet (38); The waste gas incinerator (3) further comprises a Venturi rectifying device (33) and a middle partition wall (34) for promoting turbulent mixing of high-temperature flue gas in the furnace; The waste liquid treatment system comprises a waste liquid incinerator (2); the waste liquid incinerator (2) comprises a temperature-controlled waste gas inlet, the temperature-controlled waste gas inlet is connected to the waste gas pipeline high temperature section (12) via a temperature-controlled waste gas pipeline (15); the flue gas outlet of the waste liquid incinerator (2) is connected to the upstream incineration flue gas inlet (38).

2. The combined incineration device for chemical waste gas and waste liquid according to claim 1 is characterized in that: The waste gas incinerator outlet section (37) of the waste gas incinerator (3) is connected to the heat exchange flue gas inlet of the waste heat recovery device (5), and the heat exchange flue gas outlet of the waste heat recovery device (5) is connected to the chimney (6).

3. The combined incineration device for chemical waste gas and waste liquid according to claim 1 is characterized in that: The high-temperature section (12) of the exhaust gas pipeline is provided with a shutoff damper (14) for cutting off the exhaust gas delivery, and an exhaust pipeline (13) for discharging the exhaust gas when the shutoff damper (14) is closed.

4. The combined incineration device for chemical waste gas and waste liquid according to claim 1 is characterized in that: The high-temperature section (12) of the waste gas pipeline is provided with a waste gas regulating baffle (17) capable of adjusting the flow rate of waste gas entering the waste liquid incinerator (2).

5. The combined incineration device for chemical waste gas and waste liquid according to any one of claims 1 to 4, characterized in that: The waste liquid incinerator (2) is lined with a waste liquid incinerator castable (21); and the waste gas incinerator (3) is lined with a waste gas incinerator castable (31).

6. The combined incineration device for chemical waste gas and waste liquid according to any one of claims 1 to 4, characterized in that: An auxiliary fuel burner (32) for conveying auxiliary fuel to the furnace is arranged on the furnace wall of the waste gas incinerator (3).

7. The combined incineration device for chemical waste gas and waste liquid according to any one of claims 1 to 4, characterized in that: The flue gas outlet end of the waste gas incinerator (3) is provided with a temperature regulating air duct (4) for regulating the outlet flue gas temperature.

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