Flue gas quenching system and flue gas quenching method

Abstract

The invention discloses a system for flue gas quenching and a flue gas quenching method, and the system comprises a supergravity machine which is used for introducing flue gas through a first inlet of the supergravity machine to rapidly cool the flue gas; a first inlet of the washing liquid tank is connected with a second outlet of the super-gravity machine, the washing liquid tank is used for recovering alkali washing liquid used for flue gas cooling at the second outlet of the super-gravity machine, and meanwhile alkali liquid is supplemented through a second inlet of the washing liquid tank; an inlet of the solid-liquid separation device is connected with an outlet of the washing liquid tank, and a first outlet of the solid-liquid separation device is connected with a second inlet of the supergravity machine. A supergravity machine is adopted for quenching, cooling liquid (washing liquid) is dispersed into a large number of liquid infinitesimal elements under driving of centrifugal force, the heat transfer and mass transfer process is enhanced, the temperature of high-temperature flue gas can be rapidly reduced within 100 ms, and the situation that the flue gas stays for a long time in the generation temperature interval of toxic and harmful gas is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of flue gas treatment, and in particular relates to a system for rapid cooling of flue gas and a method for rapid cooling of flue gas. Background Art

[0002] Organic waste and organic pollutants are usually treated directly by oxygen combustion, and the temperature is generally controlled at around 850-1200℃. The flue gas produced usually contains chlorine-containing substances, and dioxins will be produced during the cooling process of the flue gas. Temperature is an important factor affecting the production of dioxins. Usually, when the temperature of chlorine-containing flue gas is reduced from high temperature to 250-300℃, a large amount of dioxins will be formed again. Therefore, the high-temperature gas generated by the incineration of the garbage incinerator needs to enter the quenching tower after coming out of the combustion chamber and cool from the high temperature of 850-1200℃ to below 200℃ in a very short time (within 1s), passing the secondary formation conditions of dioxins and avoiding the secondary formation of dioxins. Among them, the quenching tower is the core device for flue gas cooling. The existing quenching devices include tower water spray or Venturi flue gas quenching device. The former mainly uses compressed air in the cooling tower to atomize the water spray. The water is atomized into very fine droplets. The droplets evaporate quickly in the high-temperature flue gas, absorb a large amount of heat from the flue gas, and quickly cool the flue gas. The latter uses the characteristics of the Venturi throat. The high-temperature flue gas obtains a very high speed at the Venturi throat, driving the water to form an atomized flow mixing zone, thereby achieving the purpose of cooling the high-temperature flue gas. The former has a large equipment volume, and the rapid cooling effect mainly depends on the atomization ability of the nozzle. The smaller the nozzle hole, the smaller the droplets formed, and the larger the surface area of ​​the droplets per unit volume. However, it is more likely to be blocked during operation, especially when more and more debris is recycled after the washing liquid is used. The latter is a passive cooling device, but relying on the atomized mixing zone at the throat often cannot achieve a thorough cooling effect. It is usually equipped with liquid spray at different angles in the radial direction to enhance cooling. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a system and a method for rapid cooling of flue gas in view of the above-mentioned deficiencies in the prior art. The rapid cooling effect of high-temperature flue gas is good during the rapid cooling process, thereby avoiding secondary environmental pollution.

[0004] The technical solution adopted to solve the technical problem of the present invention is to provide a system for rapid cooling of flue gas, comprising:

[0005] The supergravity machine comprises a supergravity machine body, a first inlet of the supergravity machine, a second inlet of the supergravity machine, a first outlet of the supergravity machine and a second outlet of the supergravity machine, wherein the supergravity machine is used to rapidly cool the flue gas by introducing the flue gas through the first inlet of the supergravity machine, the first outlet of the supergravity machine is used to discharge the humid flue gas, and the second outlet of the supergravity machine is used to discharge the first liquid;

[0006] The washing liquid tank comprises a washing liquid tank body, a first washing liquid tank inlet, a second washing liquid tank inlet and a washing liquid tank outlet arranged on the washing liquid tank body, wherein the first washing liquid tank inlet is connected to the second outlet of the supergravity machine to collect and reuse the first liquid of the supergravity machine, the second washing liquid tank inlet is used to supplement the alkali solution, and the washing liquid tank outlet is used to discharge the second liquid;

[0007] The solid-liquid separation device comprises a solid-liquid separation device body, a solid-liquid separation device inlet arranged on the solid-liquid separation device body, a first solid-liquid separation device outlet, and a second solid-liquid separation device outlet, wherein the solid-liquid separation device inlet is connected to the washing liquid tank outlet, the solid-liquid separation device is used for solid-liquid separation, the first solid-liquid separation device outlet is connected to the second inlet of the supergravity machine, the first solid-liquid separation device outlet is used for discharging a third liquid, and the second solid-liquid separation device outlet is used for discharging slurry.

[0008] Preferably, the system for rapid cooling of flue gas further includes: a demister, the washing liquid tank further includes a third inlet of the washing liquid tank arranged on the washing liquid tank body, the demister is respectively connected to the first outlet of the supergravity machine and the third inlet of the washing liquid tank, the demister is used to capture the liquid and insoluble matter entrained in the humid flue gas at the first outlet of the supergravity machine, and to pass flushing water to flush the insoluble matter attached to the demister, and the third inlet of the washing liquid tank is used to collect the tail gas entrained droplets captured by the demister and the waste liquid from cleaning the demister.

[0009] Preferably, the system for rapid cooling of flue gas further includes: a cooler connected to the demister, the cooler being used to cool and dehumidify the exhaust gas discharged from the demister, the washing liquid tank also including a fourth inlet of the washing liquid tank arranged on the washing liquid tank body, the cooler being connected to the fourth inlet of the washing liquid tank, and the fourth inlet of the washing liquid tank being used to collect moisture generated after the humid flue gas is dehumidified at low temperature by the cooler.

[0010] Preferably, the system for rapid cooling of flue gas further comprises: a circulation pump, which is arranged on the connecting pipe between the inlet of the solid-liquid separation device and the outlet of the washing liquid tank, and the circulation pump is connected to the inlet of the solid-liquid separation device and the outlet of the washing liquid tank respectively.

[0011] Preferably, the system for rapid cooling of flue gas further comprises: a sewage pump connected to the solid-liquid separation device, and the sewage pump is used to discharge the slurry.

[0012] Preferably, in the system for rapid cooling of flue gas, the solid-liquid separation device is a cyclone or a centrifugal separator.

[0013] Preferably, the supergravity machine is a supergravity rotating packed bed or a stator-rotor supergravity rotating device.

[0014] The present invention also provides a method for rapidly cooling flue gas using the above-mentioned system for rapidly cooling flue gas, comprising the following steps:

[0015] First, an alkali solution is introduced into the washing liquid tank, and the alkali solution enters the inlet of the solid-liquid separation device through the outlet of the washing liquid tank, and enters the second inlet of the supergravity machine from the first outlet of the solid-liquid separation device, and the washing liquid circulates in the above path;

[0016] The flue gas is introduced into the supergravity machine to be rapidly cooled by contact with the washing liquid, and the first gas phase wet flue gas is discharged through the first outlet of the supergravity machine, and the first liquid is discharged through the second outlet of the supergravity machine;

[0017] collecting the first liquid into a washing liquid tank;

[0018] The first liquid enters the solid-liquid separation device through the washing liquid tank for solid-liquid separation, the third liquid is discharged through the first outlet of the solid-liquid separation device, the slurry is discharged through the second outlet of the solid-liquid separation device, and the third liquid is passed into the supergravity machine.

[0019] Preferably, the method for rapid cooling of flue gas further comprises the following steps:

[0020] The first gas phase containing wet flue gas is introduced into the demister for defogger to separate the entrained droplets and insoluble matter, and the tail gas is discharged through the demister.

[0021] Preferably, the method for rapid cooling of flue gas further comprises the following steps:

[0022] The exhaust gas discharged from the demister is passed into the cooler for cooling and dehumidification before being discharged.

[0023] Preferably, the temperature of the flue gas introduced into the supergravity machine is 850-1200°C.

[0024] Preferably, the rotation speed of the ultra-gravity machine is 900 to 3000 rpm.

[0025] Preferably, the volume flow ratio of the flue gas introduced into the supergravity machine to the third liquid is (100-1000):1.

[0026] Preferably, the mass percentage concentration of the alkaline solution introduced into the washing liquid tank is 5 to 20%.

[0027] Preferably, the flow rate of the flue gas introduced into the supergravity machine is 1000-2500 Nm 3 / h.

[0028] Preferably, the flow rate of the third liquid introduced into the supergravity machine is 1 to 5 m 3 / h.

[0029] Preferably, the temperature of the flue gas after cooling at the first gas phase outlet of the supergravity machine is 45-60°C.

[0031] Effect of the invention: The system and method for rapid cooling of flue gas in the present invention use a super gravity machine as a high-temperature flue gas rapid cooling device. The coolant is dispersed into a large number of liquid micro-elements driven by centrifugal force, which greatly enhances the heat transfer and mass transfer process, can quickly reduce the temperature of high-temperature flue gas, and prevent the flue gas from staying in the temperature range of toxic and harmful gases (such as dioxins) for a long time. In addition, the system has a small device size and high operational flexibility, and has practical industrial use value. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the structure of the system for flue gas rapid cooling in Example 2 of the present invention.

[0033] In the figure: 1-supergravity machine body; 2-supergravity machine first inlet; 3-supergravity machine second inlet; 4-supergravity machine first outlet; 5-supergravity machine second outlet; 6-washing liquid tank body; 7-washing liquid tank first inlet; 8-washing liquid tank second inlet; 9-washing liquid tank third inlet; 10-washing liquid tank fourth inlet; 11-washing liquid tank outlet; 12-washing liquid tank online acidity and density measuring instrument; 13-solid-liquid separation device body; 14-solid-liquid separation device inlet; 15-solid-liquid separation device first outlet; 16-solid-liquid separation device second outlet; 17-demister; 18-circulation pump; 19-sewage pump; 20-cooler. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0035] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] In the description of this patent, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this patent and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this patent.

[0037] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0038] Example 1

[0039] This embodiment provides a system for flue gas quenching, comprising:

[0040] The supergravity machine comprises a supergravity machine body, a first inlet of the supergravity machine, a second inlet of the supergravity machine, a first outlet of the supergravity machine and a second outlet of the supergravity machine, the supergravity machine is used to rapidly cool the flue gas by introducing the flue gas through the first inlet of the supergravity machine, the first outlet of the supergravity machine is used to discharge the first gas phase humid flue gas, and the second outlet of the supergravity machine is used to discharge the first liquid;

[0041] The washing liquid tank comprises a washing liquid tank body, a first washing liquid tank inlet, a second washing liquid tank inlet and a washing liquid tank outlet arranged on the washing liquid tank body, wherein the first washing liquid tank inlet is connected to the second outlet of the supergravity machine to collect and reuse the first liquid of the supergravity machine, the second washing liquid tank inlet is used to supplement the alkali solution, and the washing liquid tank outlet is used to discharge the second liquid;

[0042] The solid-liquid separation device comprises a solid-liquid separation device body, a solid-liquid separation device inlet arranged on the solid-liquid separation device body, a first solid-liquid separation device outlet, and a second solid-liquid separation device outlet, wherein the solid-liquid separation device inlet is connected to the washing liquid tank outlet, the solid-liquid separation device is used for solid-liquid separation, the first solid-liquid separation device outlet is connected to the second inlet of the supergravity machine, the first solid-liquid separation device outlet is used for discharging a third liquid, and the second solid-liquid separation device outlet is used for discharging slurry.

[0043] This embodiment also provides a method for rapid cooling of flue gas using the above-mentioned system for rapid cooling of flue gas, comprising the following steps:

[0044] First, an alkali solution is introduced into the washing liquid tank, and the alkali solution enters the inlet of the solid-liquid separation device through the outlet of the washing liquid tank, and enters the second inlet of the supergravity machine from the first outlet of the solid-liquid separation device, and the washing liquid circulates in the above path;

[0045] The flue gas is introduced into the supergravity machine to be rapidly cooled by contact with the washing liquid, and the first gas phase wet flue gas is discharged through the first outlet of the supergravity machine, and the first liquid is discharged through the second outlet of the supergravity machine;

[0046] collecting the first liquid into a washing liquid tank;

[0047] The first liquid enters the solid-liquid separation device through the washing liquid tank for solid-liquid separation, the third liquid is discharged through the first outlet of the solid-liquid separation device, the slurry is discharged through the second outlet of the solid-liquid separation device, and the third liquid is passed into the supergravity machine.

[0048] The system and method for rapid cooling of flue gas in this embodiment use a super gravity machine as a high-temperature flue gas rapid cooling device. The coolant is dispersed into a large number of liquid micro-elements driven by centrifugal force, which greatly enhances the heat transfer and mass transfer process, can quickly reduce the temperature of high-temperature flue gas, and prevent the flue gas from staying in the temperature range of toxic and harmful gases (such as dioxins) for a long time. In addition, the system has a small device size and high operational flexibility, and has practical industrial use value.

[0049] Example 2

[0050] like Figure 1 As shown, this embodiment provides a system for flue gas quenching, comprising:

[0051] The supergravity machine comprises a supergravity machine body 1, a supergravity machine first inlet 2, a supergravity machine second inlet 3, a supergravity machine first outlet 4 and a supergravity machine second outlet 5 arranged on the supergravity machine body 1, the supergravity machine is used to rapidly cool the flue gas by introducing the flue gas through the supergravity machine first inlet 2, the supergravity machine first outlet 4 is used to discharge the cooled first gas phase low-temperature humid flue gas, and the supergravity machine second outlet 5 is used to discharge the first liquid;

[0052] A washing liquid tank, comprising a washing liquid tank body 6, a first washing liquid tank inlet 7, a second washing liquid tank inlet 8, a third washing liquid tank inlet 9, a fourth washing liquid tank inlet 10, a washing liquid tank outlet 11, and an online acidity and density online measuring instrument 12 for the washing liquid tank, wherein the first washing liquid tank inlet 7 is connected to the second outlet 5 of the supergravity machine to collect and reuse the first liquid of the supergravity machine, the second washing liquid tank inlet 8 is introduced into a fresh alkaline solution, the third washing liquid tank inlet 9 is used to collect tail gas entrained droplets and cleaning waste liquid captured by the demister 17, the fourth washing liquid tank inlet 10 is used to collect moisture generated after low-temperature humid flue gas is dehumidified by the cooler 20, and the washing liquid tank outlet 11 is used to discharge the second liquid;

[0053] The solid-liquid separation device includes a solid-liquid separation device body 13, a solid-liquid separation device inlet 14 arranged on the solid-liquid separation device body 13, a first solid-liquid separation device outlet 15, and a second solid-liquid separation device outlet 16. The solid-liquid separation device inlet 14 is connected to the washing liquid tank outlet 11. The solid-liquid separation device is used for solid-liquid separation. The solid-liquid separation device first outlet 15 is connected to the second inlet 3 of the ultra-gravity machine. The solid-liquid separation device first outlet 15 is used to discharge the third liquid. The solid-liquid separation device second outlet 16 is used to discharge slurry.

[0054] Preferably, the system for rapid cooling of flue gas further includes: a demister 17, which is respectively connected to the first outlet 4 of the supergravity machine and the third inlet 9 of the washing liquid tank. The demister 17 is used to capture the liquid and insoluble matter (such as dust, organic matter, etc.) entrained in the wet flue gas at the first outlet 4 of the supergravity machine, and regularly introduce flushing water to flush the insoluble matter attached to the demister 17.

[0055] Preferably, the system for rapid cooling of flue gas further comprises: a cooler 20 connected to the demister 17 , and the cooler 20 is used for deep cooling and dehumidifying the exhaust gas discharged from the demister 17 .

[0056] Preferably, the system for rapid cooling of flue gas further comprises: a circulation pump 18, which is arranged on the connecting pipe between the solid-liquid separation device inlet 14 and the washing liquid tank outlet 11, and the circulation pump 18 is connected to the solid-liquid separation device inlet 14 and the washing liquid tank outlet 11 respectively.

[0057] Preferably, the system for rapid cooling of flue gas further comprises: a sewage pump 19 connected to the solid-liquid separation device, and the sewage pump 19 is used to discharge slurry.

[0058] Preferably, in the system for rapid cooling of flue gas, the solid-liquid separation device is a cyclone or a centrifugal separator. Specifically, the solid-liquid separation device in this embodiment is a cyclone.

[0059] Preferably, the supergravity machine is a supergravity rotating packed bed or a stator-rotor supergravity rotating device.

[0060] The hypergravity machine provided in this embodiment refers to a device that has a rotor installed in a sealed housing, and relies on the centrifugal force generated by high-speed rotation to divide and crush the fluid and form a large number of liquid micro-elements. The hypergravity machine includes a hypergravity rotating packed bed with a packing layer or a stator-rotor hypergravity rotating device without packing that relies on the relative speed between the high-speed rotating rotor and the stator to impact, crush, and disperse the liquid.

[0061] Specifically, the supergravity machine in this embodiment is a supergravity rotating packed bed.

[0062] The high-temperature flue gas enters the ultra-gravity machine, and the coolant (third liquid) used for rapid cooling of the flue gas is evenly sprinkled onto the packing layer inside the ultra-gravity machine by the liquid distributor of the ultra-gravity machine, and contacts with the gas (flue gas) in countercurrent. The high-speed rotating packing layer tears the washing liquid (third liquid) into nano-micrometer-scale droplets and liquid filaments, which are quickly vaporized when encountering the high-temperature gas (flue gas), and the high-temperature gas (flue gas) is cooled to about 60°C in a very short time.

[0063] The second outlet 5 of the super gravity machine is connected to the first inlet 7 of the washing liquid tank. The washing liquid (second liquid) in the washing liquid tank is sent to the cyclone by the circulating pump 18 to separate the insoluble matter, and the supernatant is returned to the super gravity machine for reuse. The first outlet 4 of the super gravity machine is connected to the demister 17, and the entrained liquid particles are removed by the demister 17. The tail gas at the outlet of the demister 17 is sent to the cooler 20 to further reduce the moisture content of the tail gas before being discharged or entering subsequent treatment.

[0064] This embodiment also provides a method for rapid cooling of flue gas using the above-mentioned system for rapid cooling of flue gas, comprising the following steps:

[0065] Fresh alkali solution is introduced into the washing liquid tank from the second inlet 8 of the washing liquid tank, and the alkali solution enters the washing liquid circulation pump 18 through the washing liquid tank outlet 11, and is introduced into the solid-liquid separation device inlet 14 by the washing liquid circulation pump 18, and enters the second inlet 3 of the supergravity machine from the first outlet 15 of the solid-liquid separation device, and the washing liquid circulates in the above path;

[0066] The flue gas is introduced into the super gravity machine, and the flue gas and the washing liquid are rapidly cooled by heat exchange in the super gravity machine, and the first gas phase wet flue gas is discharged through the first outlet 4 of the super gravity machine, and the first liquid is discharged through the second outlet 5 of the super gravity machine;

[0067] The first liquid is collected into a washing liquid tank, and an online acidity and density measuring instrument 12 of the washing liquid tank monitors the acidity and density of the washing liquid in the washing liquid tank in real time. When the density is too large (1.5 kg / L) or the acidity is too small (pH ≤ 8), the washing liquid is completely or partially emptied, and fresh alkali solution is added to the washing liquid tank through the second inlet 8 of the washing liquid tank;

[0068] The first liquid enters the solid-liquid separation device through the washing liquid tank for solid-liquid separation, the third liquid is discharged through the first outlet 15 of the solid-liquid separation device, the slurry is discharged through the second outlet 16 of the solid-liquid separation device, and the third liquid is passed into the supergravity machine.

[0069] Preferably, the method for rapid cooling of flue gas further comprises the following steps:

[0070] The first gas phase is introduced into the demister 17 for defogger, and the tail gas is discharged through the demister 17.

[0071] Preferably, the method for rapid cooling of flue gas further comprises the following steps:

[0072] The exhaust gas discharged from the demister 17 is passed into the cooler 20 to be cooled and dehumidified before being discharged.

[0073] Preferably, the temperature of the flue gas introduced into the supergravity machine is 850-1200°C.

[0074] Preferably, the rotation speed of the ultra-gravity machine is 900 to 3000 rpm.

[0075] Preferably, the volume flow ratio of the flue gas introduced into the supergravity machine to the third liquid is (100-1000):1.

[0076] Preferably, the mass percentage concentration of the alkaline solution introduced into the washing liquid tank is 5 to 20%.

[0077] Preferably, the flow rate of the flue gas introduced into the supergravity machine is 1000-2500 Nm 3 / h.

[0078] Preferably, the flow rate of the third liquid introduced into the supergravity machine is 1 to 5 m 3 / h.

[0079] Preferably, the temperature of the flue gas after cooling is 45-60°C.

[0080] Specifically, the flue gas in this embodiment is high-temperature flue gas.

[0081] This embodiment provides a method for rapid cooling of flue gas using the above-mentioned system for rapid cooling of flue gas. The alkaline washing liquid of the washing liquid tank (via the first outlet 15 of the solid-liquid separation device) enters the supergravity machine from the second inlet 3 of the supergravity machine, and is evenly sprayed on the packing layer of the supergravity machine or the stator-rotor inner cavity by the distributor in the supergravity machine. The speed of the supergravity machine is controlled at 900-3000 rpm. High-temperature flue gas exceeding 850°C is introduced from the first inlet 2 of the supergravity machine. During operation, the volume flow ratio of the high-temperature flue gas to the third liquid is (100-800): 1; the gas temperature of the first outlet 4 of the supergravity machine is 45-60°C. The first liquid that completes the rapid cooling process is collected in the washing liquid tank, and is transported to the cyclone by the circulating pump 18 to separate the insoluble matter in the second liquid, and the supernatant (third liquid) is returned to the supergravity machine for reuse. The cooled and purified exhaust gas passes through a high-efficiency demister 17 to remove entrained liquid particles, and is further cooled to reduce the moisture content of the exhaust gas before being discharged or entering subsequent treatment.

[0082] Specifically, using the system and method in this embodiment, firstly, a 10mas% dilute alkali solution is introduced into the washing liquid tank, and then the circulation pump 18 is turned on to circulate the washing liquid between the supergravity machine, the washing liquid tank, the cyclone, etc. Then, a high-temperature acid flue gas of 850-900°C is introduced with a flow rate of 2360Nm 3 / h, control the flow rate of washing liquid to 3m 3 / h, the speed of the supergravity machine is controlled at 900 rpm, the time for the flue gas to flow through the supergravity machine is 0.034s, and the exhaust gas temperature at the supergravity machine outlet is 55℃.

[0083] The system and method for rapid cooling of flue gas in this embodiment use a super gravity machine as a high-temperature flue gas rapid cooling device. The coolant (third liquid) is dispersed into a large number of liquid micro-elements under the drive of centrifugal force, which greatly enhances the heat transfer and mass transfer process, can quickly reduce the temperature of high-temperature flue gas, and prevent the flue gas from staying in the temperature range of toxic and harmful gases (such as dioxins) for a long time. In addition, the system has a small device size and high operational flexibility, and has practical industrial use value.

[0084] Example 3

[0085] This embodiment provides a method for rapid cooling of flue gas using the system for rapid cooling of flue gas in the above-mentioned embodiment 2, which is different from the method in embodiment 2 in that:

[0086] The temperature of the flue gas introduced into the supergravity machine is 850°C.

[0087] The speed of the hypergravity machine is 2000 rpm.

[0088] The mass percent concentration of the alkaline solution introduced into the washing liquid tank is 5%.

[0089] The flow rate of flue gas entering the supergravity machine is 1000Nm 3 / h.

[0090] The flow rate of the third liquid introduced into the supergravity machine is 1m 3 / h.

[0091] The flue gas temperature after cooling is 50℃.

[0092] The system and method for rapid cooling of flue gas in this embodiment use a super gravity machine as a high-temperature flue gas rapid cooling device. The coolant (third liquid) is dispersed into a large number of liquid micro-elements under the drive of centrifugal force, which greatly enhances the heat transfer and mass transfer process, can quickly reduce the temperature of high-temperature flue gas, and prevent the flue gas from staying in the temperature range of toxic and harmful gases (such as dioxins) for a long time. In addition, the system has a small device size and high operational flexibility, and has practical industrial use value.

[0093] Example 4

[0094] This embodiment provides a method for rapid cooling of flue gas using the system for rapid cooling of flue gas in the above-mentioned embodiment 2, which is different from the method in embodiment 2 in that:

[0095] The temperature of the flue gas introduced into the supergravity machine is 1200°C.

[0096] The speed of the hypergravity machine is 3000 rpm.

[0097] The mass percentage concentration of the alkaline solution introduced into the washing liquid tank is 20%.

[0098] The flow rate of flue gas entering the supergravity machine is 2500Nm 3 / h.

[0099] The flow rate of the third liquid introduced into the supergravity machine is 5m 3 / h.

[0100] The flue gas temperature after cooling is 60℃.

[0101] The system and method for rapid cooling of flue gas in this embodiment use a super gravity machine as a high-temperature flue gas rapid cooling device. The coolant (third liquid) is dispersed into a large number of liquid micro-elements under the drive of centrifugal force, which greatly enhances the heat transfer and mass transfer process, can quickly reduce the temperature of high-temperature flue gas, and prevent the flue gas from staying in the temperature range of toxic and harmful gases (such as dioxins) for a long time. In addition, the system has a small device size and high operational flexibility, and has practical industrial use value.

[0102] Example 5

[0103] This embodiment provides a method for rapid cooling of flue gas using the system for rapid cooling of flue gas in the above-mentioned embodiment 2, which is different from the method in embodiment 2 in that:

[0104] The high temperature flue gas temperature is 1150~1200℃, and the flue gas flow rate is 1434Nm 3 / h, the circulating washing liquid flow rate is 3m 3 / h, the speed of the supergravity machine is 3000 rpm, the time for the flue gas to flow through the supergravity machine is about 0.057s, and the flue gas temperature at the outlet of the supergravity machine is 45℃.

[0105] The system and method for rapid cooling of flue gas in this embodiment use a super gravity machine as a high-temperature flue gas rapid cooling device. The coolant (third liquid) is dispersed into a large number of liquid micro-elements under the drive of centrifugal force, which greatly enhances the heat transfer and mass transfer process, can quickly reduce the temperature of high-temperature flue gas, and prevent the flue gas from staying in the temperature range of toxic and harmful gases (such as dioxins) for a long time. In addition, the system has a small device size and high operational flexibility, and has practical industrial use value.

[0106] Comparative Example 1

[0107] A certain project uses a Venturi quenching device and a spray cooling process. The high-temperature flue gas temperature at the inlet is 1150-1200°C, and the flue gas flow rate is about 1434Nm 3 / h, venturi quench cooling water flow 8m 3 / h, the exhaust gas passes through the Venturi throat and is sprayed with water, with a spray flow rate of about 6m 3 / h, after passing through the Venturi quench cooler, the flue gas temperature close to the wall is measured to be 70-75℃, and the flue gas center temperature is 180-200℃; after spray cooling, the overall flue gas temperature is about 70℃, and the flue gas circulation time is about 0.22s.

[0108] The comparison of the main parameters of the gas phase logistics before and after the treatment of the above-mentioned Example 5 and Comparative Example 1 is shown in the following table:

[0109]

[0110] Comparing the above table, it can be seen that after the high-temperature flue gas passes through the quenching device described in this patent, the amount of dioxin generated in the quenching process is reduced by 77% compared with the Venturi quenching device and spray cooling process. It can also be seen that this device also has a high purification effect on acidic gases and dust impurities in high-temperature flue gas, among which CO2 is removed by 84%, NOx is removed by 88%, HCl is removed by 99.5%, and dust is removed by 96%.

[0111] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A system for rapid cooling of flue gas, characterized in that: include: The supergravity machine comprises a supergravity machine body, a first inlet of the supergravity machine, a second inlet of the supergravity machine, a first outlet of the supergravity machine and a second outlet of the supergravity machine, wherein the supergravity machine is used to rapidly cool the flue gas by introducing the flue gas through the first inlet of the supergravity machine, the first outlet of the supergravity machine is used to discharge the humid flue gas, and the second outlet of the supergravity machine is used to discharge the first liquid; The washing liquid tank comprises a washing liquid tank body, a first washing liquid tank inlet, a second washing liquid tank inlet and a washing liquid tank outlet arranged on the washing liquid tank body, wherein the first washing liquid tank inlet is connected to the second outlet of the supergravity machine to collect and reuse the first liquid of the supergravity machine, the second washing liquid tank inlet is used to supplement the alkali solution, and the washing liquid tank outlet is used to discharge the second liquid; The solid-liquid separation device comprises a solid-liquid separation device body, a solid-liquid separation device inlet arranged on the solid-liquid separation device body, a first solid-liquid separation device outlet, and a second solid-liquid separation device outlet, wherein the solid-liquid separation device inlet is connected to the washing liquid tank outlet, the solid-liquid separation device is used for solid-liquid separation, the first solid-liquid separation device outlet is connected to the second inlet of the supergravity machine, the first solid-liquid separation device outlet is used for discharging a third liquid, and the second solid-liquid separation device outlet is used for discharging slurry.

2. The system for flue gas quenching according to claim 1, characterized in that: Also includes: The demister, the washing liquid tank also includes a third inlet of the washing liquid tank arranged on the washing liquid tank body, the demister is respectively connected to the first outlet of the supergravity machine and the third inlet of the washing liquid tank, the demister is used to capture the liquid and insoluble matter entrained in the wet flue gas of the first outlet of the supergravity machine, and pass flushing water to flush the insoluble matter attached to the demister, the third inlet of the washing liquid tank is used to collect the tail gas entrained droplets captured by the demister and the waste liquid from the demister cleaning.

3. The system for flue gas quenching according to claim 2, characterized in that: Also includes: A cooler is connected to the demister, and the cooler is used to cool and dehumidify the exhaust gas discharged from the demister. The washing liquid tank also includes a fourth inlet of the washing liquid tank arranged on the washing liquid tank body. The cooler is connected to the fourth inlet of the washing liquid tank, and the fourth inlet of the washing liquid tank is used to collect moisture generated after the humid flue gas is dehumidified at low temperature by the cooler.

4. The system for flue gas quenching according to claim 1, characterized in that: Also includes: The circulation pump is arranged on the connecting pipeline between the inlet of the solid-liquid separation device and the outlet of the washing liquid tank, and the circulation pump is connected to the inlet of the solid-liquid separation device and the outlet of the washing liquid tank respectively.

5. The system for flue gas quenching according to claim 1, characterized in that: Also includes: The sewage pump is connected to the solid-liquid separation device, and is used to discharge the slurry.

6. The system for rapid cooling of flue gas according to any one of claims 1 to 5, characterized in that: The solid-liquid separation device is a cyclone or a centrifugal separator.

7. The system for rapid cooling of flue gas according to any one of claims 1 to 5, characterized in that: The supergravity machine is a supergravity rotating packed bed or a stator-rotor supergravity rotating device.

8. A method for rapid cooling of flue gas using the system for rapid cooling of flue gas according to any one of claims 1 to 7, characterized in that: The following steps are involved: First, an alkali solution is introduced into the washing liquid tank, and the alkali solution enters the inlet of the solid-liquid separation device through the outlet of the washing liquid tank, and enters the second inlet of the supergravity machine from the first outlet of the solid-liquid separation device; The flue gas is introduced into the supergravity machine to be rapidly cooled by contact with the washing liquid, and the first gas phase wet flue gas is discharged through the first outlet of the supergravity machine, and the first liquid is discharged through the second outlet of the supergravity machine; collecting the first liquid into a washing liquid tank; The first liquid enters the solid-liquid separation device through the washing liquid tank for solid-liquid separation, the third liquid is discharged through the first outlet of the solid-liquid separation device, the slurry is discharged through the second outlet of the solid-liquid separation device, and the third liquid is passed into the supergravity machine.

9. The method for rapid cooling of flue gas according to claim 8, characterized in that: The following steps are also included: The first gas phase is introduced into a demister for defogger, and the tail gas is discharged through the demister.

10. The method for rapid cooling of flue gas according to claim 9, characterized in that: The following steps are also included: The exhaust gas discharged from the demister is passed into the cooler for cooling and dehumidification before being discharged.

11. The method for rapid cooling of flue gas according to claim 8, characterized in that: The temperature of the flue gas introduced into the supergravity machine is 850-1200°C.

12. The method for rapid cooling of flue gas according to claim 8, characterized in that: The speed of the ultra-gravity machine is 900 to 3000 rpm.

13. The method for rapid cooling of flue gas according to claim 8, characterized in that: The volume flow ratio of the flue gas introduced into the supergravity machine to the third liquid is (100-1000):

1.

14. The method for rapid cooling of flue gas according to claim 8, characterized in that: The flow rate of flue gas entering the super gravity machine is 1000~2500Nm 3 / h.

15. The method for rapid cooling of flue gas according to claim 8, characterized in that: The flow rate of the third liquid introduced into the supergravity machine is 1 to 5 m 3 / h.

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