CN106766153A - A kind of many spray orifice type hot-blast stoves - Google Patents

Abstract

A kind of many spray orifice type hot-blast stoves, including burning zone and one section of mixed wind, mixed two sections of wind.The front end of burning zone is provided with main burner and automatic ignition burner is provided with outside burning zone and for the circulated air induced duct to burning zone inner ventilation, one section of mixed wind includes outer cylinder body and the mixed air duct of metal as the inner barrel many spray orifices concentric with outer cylinder body, there is annular space or annular space as inlet air plenum between the mixed air duct of many spray orifices in outer cylinder body and as inner barrel, multiple spray orifices are evenly distributed on the wall of the mixed air duct of many spray orifices, the front end of the mixed air duct of many spray orifices as inner barrel of mixed one section of wind is connected with the back-end sealing of burning zone, the rear end of the mixed air duct of many spray orifices is provided with the first hot-blast outlet, the wall of the outer cylinder body of mixed one section of wind is provided with circulation wind inlet and the circulation wind inlet is connected with circulation airduct.Many spray orifice type hot-blast stoves reduce high temperature NOx generations, it is ensured that circulating cooling wind mixes with high temperature hot gas Quick uniform, and integral device is compact, size is small, can need flexible arrangement according to production.

Description

A multi-nozzle type hot blast furnace

technical field

The invention belongs to the field of thermal energy engineering, and in particular relates to a multi-nozzle type hot blast stove.

Background technique

At present, activated carbon (activated coke) is mostly used in the desulfurization and denitrification process of sintering flue gas in iron and steel enterprises. The regeneration of activated carbon (activated coke) in this process requires indirect heating with flue gas at about 500 °C, and the flue gas temperature after heat exchange is about 300 °C. In order to improve the heating efficiency, the flue gas is usually circulated, as shown in Figure 1. The main function of the hot blast stove is to reheat the circulating flue gas. Under this process, the furnace of the hot blast stove is operated under positive pressure. In order to prevent hot smoke from escaping, the overall sealing of this type of hot blast stove is required to be high.

Activated carbon dry process is currently the main promotion technology for sintering flue gas treatment, which can realize simultaneous desulfurization, denitrification, dioxin removal, heavy metal removal and dust removal in the process of sintering flue gas treatment.

The desulfurization and denitrification system mainly includes activated carbon adsorption, activated carbon analysis and activated carbon transportation system, activated carbon replenishment system, thermal cycle and rich SO ₂ transportation system. Harmful impurities in the sintering waste gas can be absorbed by the adsorption tower to remove dust, heavy metals, SO ₂ and NOx; the desorption tower can remove dioxins and transport the enriched SO ₂ to the acid system. During the desorption process of activated carbon in the desorption tower, high-temperature flue gas is required for indirect heating.

Due to the large amount of high-temperature flue gas required by the desorption tower, the temperature difference between the inlet and outlet is relatively small, only 100-200°C. In order to save energy, circulating flue gas is currently used to supply heat to the desorption tower.

The hot blast stove heats the low-temperature circulating flue gas at the outlet of the desorption tower.

The existing hot blast stove is composed of a combustion chamber and a mixing chamber, which are separated by a partition wall. After the gas is completely burned in the combustion chamber, the high-temperature flue gas produced is mixed with the circulating cooling air in the mixing chamber, and the mixed flue gas meets the process requirements. After the temperature is discharged, as shown in Figure 2. However, the existing hot blast stove usually adopts a full-lined structure, and the weight of the equipment is relatively large; the temperature of the combustion chamber is high, and the amount of NOx generated at high temperature is relatively large; the circulating cooling air only directly enters the mixing chamber through one or several nozzles and the high-temperature flue gas Mixing, the uniformity of the mixed air is poor, a large mixing space is required, and the equipment is large in size. The layout of this furnace type can only be arranged horizontally, and it is not suitable for vertical arrangement.

Since the desulfurization and denitrification process of sintering flue gas in iron and steel enterprises is usually to transform the original facilities, the site is usually very tight, requiring the equipment to occupy a small area, and the furnace layout should meet the actual requirements of the site as much as possible.

Contents of the invention

Industrial-scale desorption towers (regeneration towers) generally have a height of 20-30 meters and a diameter of several meters to more than ten meters. There is a large demand for circulating hot air. At the same time, the temperature of the hot air is required to match the desorption temperature of activated carbon.

The object of the invention is to design a new hot blast stove for the existing problems of the hot blast stove in the large-scale activated carbon desulfurization and denitrification device of the prior art comprising activated carbon adsorption tower), analytical tower (regeneration tower) and hot blast stove (or heating furnace), On the one hand, it can stably generate a large amount of hot air at a suitable temperature, on the other hand, it can reduce the production of nitrogen oxides.

According to a first aspect of the present invention, there is provided a (horizontal or vertical) multi-nozzle type hot blast stove, which includes a combustion section, a first mixing section and a second mixing section,

Among them, the front end (i.e. the starting end) of the combustion section is provided with a main burner and an automatic ignition burner and a circulating air induction pipe for ventilation to the interior of the combustion section are provided outside the combustion section; the air mixing section includes an outer cylinder And the metal multi-nozzle air mixing cylinder as the inner cylinder coaxial with the outer cylinder, there is an annular gap or annular space between the outer cylinder and the multi-nozzle mixing air cylinder as the inner cylinder as the annular air inlet chamber On the wall of the multi-jet hole mixing cylinder, a plurality of (for example, 20-2000,) spray holes (air inlet holes) are evenly or substantially evenly distributed, and the multi-nozzle mixing hole of the air mixing section is used as the inner cylinder. The front end of the air cylinder is sealed and connected with the rear end of the combustion section, the rear end of the multi-nozzle air mixing cylinder is provided with a first hot air outlet, the wall of the outer cylinder of the air mixing section is provided with a circulating air inlet and the circulating air inlet is connected to the Circulation duct connection.

In addition, the front end of the second air mixing section is sealed and connected to the rear end of the first hot air outlet, and the second hot air outlet is provided on the side wall or end of the second air mixing section.

The second hot blast outlet communicates with the hot blast conveying main pipe. The circulating air induction duct and the circulating air duct are respectively connected to the general circulating air duct.

Preferably, the air mixing section adopts a double cylinder structure including an inner cylinder and an outer cylinder. There is an annular gas space between the two barrels.

Preferably, the above-mentioned hot blast stove also includes a second air mixing section, the front end of the second air mixing section is sealed and connected to the rear end (ie, the air outlet end) of the first hot air outlet, and a second air mixing section is provided on the side wall or end of the second air mixing section. Hot air outlet.

Preferably, the circulating air induction duct and the circulating air duct are connected to the total circulating air duct (eg drawn from the heating zone or the cooling zone of the activated carbon desorption tower) respectively.

Preferably, an auto-ignition burner is also provided on the side wall of the front end of the combustion section; preferably, the auto-ignition burner is arranged close to the main burner or integrated with the main burner into a combined device.

Preferably, the first hot-blast outlet or the second hot-blast outlet of the hot-blast stove communicates with the hot-blast delivery main pipe (drawn from the heating zone of the activated carbon desorption tower, for example).

Preferably, the combustion section has a cylindrical structure with a circular or oval or rectangular cross section, preferably a cylindrical structure.

Preferably, both the outer cylinder of the air mixing section and the multi-nozzle air mixing cylinder as the inner cylinder have a cylindrical structure with a circular or elliptical cross section.

Preferably, along the length direction and the circumferential direction of the multi-nozzle-hole air-mixing cylinder, the multiple nozzle holes are uniformly distributed or substantially uniformly distributed on the wall of the multi-nozzle-hole air-mixing cylinder.

Preferably, the cross-sectional shape of the nozzle hole is one or more of circular, oval, triangular, quadrangular, pentagonal or hexagonal; preferably, the cross-sectional shape of the nozzle hole is circular.

Preferably, the main burner is provided with a combustion air interface and a gas interface.

Preferably, a flow regulating valve is provided on the circulating air induction pipe to regulate the circulating flue gas entering the combustion chamber of the hot blast stove.

Preferably, the circulation fan inlet damper adjusts the flue gas circulation amount entering the hot blast stove. There is a flow regulating valve on the circulating air duct, or there is no flow regulating valve.

Preferably, a temperature probe and a pressure probe are provided in the combustion section.

In order to reduce the temperature in the high temperature area of the furnace in the combustion section, the circulating hot air from the heating area of the activated carbon desorption tower is introduced into the combustion section through the circulating air duct to reduce the temperature in the high temperature area of the combustion furnace in the combustion section. Preferably, one or more (such as -1 to 6) air inlets are designed along the circumference of the cylinder-shaped combustion section at the front end of the combustion section, and these air inlets are all communicated with the circulating air duct, so as to flow to the combustion section. Hot air is sprayed evenly around the inner space. Alternatively, an annular air distribution pipe (not shown) with a plurality of air injection holes is provided at one end of the combustion section close to the main burner, so as to spray hot air evenly around the inner space of the combustion section.

According to the second embodiment of the present invention, a kind of activated carbon desorption tower device is provided, and it comprises activated carbon desorption tower and above-mentioned hot blast stove, wherein this desorption tower has: the heating zone of top and the cooling zone of bottom, be positioned at tower top The inlet for inputting activated carbon to be regenerated and the outlet for outputting regenerated activated carbon at the bottom of the tower;

Wherein the first hot blast outlet or the second hot blast outlet of the hot blast stove is communicated with the hot blast inlet of the heating zone on the upper part of the desorption tower via the hot blast conveying main pipe; and

Wherein, both the circulation air induction pipe and the circulation air pipe of the hot blast stove are connected with the total circulation air pipe drawn from the hot air outlet of the heating zone at the upper part of the desorption tower or both are drawn with the air outlet of the cooling zone at the lower part of the desorption tower The total circulation duct is connected.

The multi-nozzle hole type hot blast stove provided by the invention is arranged in two parts according to the combustion section and the air mixing section. The combustion section is at high temperature, and the circulating air induction pipe introduces the cooling circulating air, which is directly fed into the furnace of the combustion section, and the temperature of the combustion section is appropriately lowered to ensure that the gas is fully combusted and the flame temperature is not too high, reducing the formation of high-temperature NOx. After that, the hot air enters the air mixing section, and the circulating cooling air entering from the circulating air inlet enters the gap or gap between the multi-nozzle air mixing cylinder and the mixing air section, and passes through the nozzle holes on the multi-nozzle mixing air cylinder to uniformly and The small flow method directly mixes with the high-temperature hot air from the combustion section to achieve rapid and uniform mixing in a limited space.

The circulating hot air passes through the openings of the multi-nozzle mixing cylinder, and is divided into numerous small streams of fluid and high-temperature hot air to mix in a small space at a high flow rate to achieve rapid and uniform mixing.

The flow regulating valve is installed in the circulating air induction pipe, which can adjust the circulating cooling air flow into the combustion section according to the temperature and other conditions in the combustion section, so as to achieve the effect of saving energy and reducing NOx generation.

Optionally, or dispensably, a flow regulating valve is provided at the front end of the circulating air inlet, which can adjust the flow of circulating cooling air entering the air mixing section, so as to adjust the temperature of the hot air finally flowing out of the hot blast stove.

In the present invention, the inner wall of the combustion section is provided with a heat insulating layer of refractory material.

In the present invention, the outer walls of the combustion section and the air mixing section are provided with insulation layers.

In the present invention, the outer wall of the second air mixing section is provided with an insulating layer.

Preferably, the inner diameters of the first air mixing section and the second air mixing section are equal or approximately equal. The inner chamber of the air-mixing first stage or the air-mixing second stage is cylindrical or a cylinder with a square or rectangular cross section. The inner cavity of the air mixing stage 1 or the air mixing stage 2 has a length of 0.7-2.2 meters, preferably 0.8-2.0 meters, preferably 0.85-1.8 meters, such as 0.9, 1.2, 1.5 or 1.6 meters. In addition, the inner cavity of the cylindrical air mixing stage 1 or air mixing stage 2 has a diameter of 0.5-1.8 meters, preferably 0.6-1.7 meters, preferably 0.7-1.5 meters, such as 0.8, 1 or 1.2 meters or 1.4 meters. Typically, the ratio of the length to the inner diameter of the lumen is 1.3-1.8:1, preferably 1.4-1.6:1.

In the present invention, only the fire-resistant and heat-insulating layer is provided on the inner wall of the combustion section, a small amount of refractory inner lining is used, and the outer wall of the hot blast stove is provided with a heat-insulating layer structure, which can effectively reduce the weight of the equipment.

Preferably, a temperature probe and a pressure probe are provided in the combustion section.

The hot blast stove of the present invention can be installed on a base.

A temperature probe monitors the temperature in the combustion section to determine the proper flow of recirculated cooling air in the recirculated air duct.

Generally, activated carbon regeneration temperature Td is in the range of 390-500°C, preferably 400-470°C, more preferably 405-450°C, more preferably 410-440°C, more preferably 410-430°C. Generally, the high temperature hot air (G0) has a temperature of 1100-1900°C.

Usually, the hot air input into the heating zone has a temperature of 400-500°C, preferably 410-480°C, more preferably 415-470°C, more preferably 420-460°C, further preferably 420-450°C.

Generally, the hot air discharged outside has a temperature of 300-380°C, preferably 320-375°C, preferably about 340-370°C.

The desorption tower of the present invention is a desulfurization tower or regeneration tower used in dry desulfurization and denitrification devices for waste gas treatment in the iron and steel industry, and usually has a tower height of 10-45 meters, preferably 15-40 meters, more preferably 20-35 meters . The desorption column generally has a main body cross-sectional area of 6-100 m ² , preferably 8-50 m ² , more preferably 10-30 m ² , further preferably 15-20 m ² . The (desulfurization, denitrification) adsorption tower (or reaction tower) in the desulfurization and denitrification device usually has a larger size, for example, the tower height of the adsorption tower is 15-60, preferably 20-50, more preferably 25-45 meters. The tower height of the adsorption tower refers to the height from the activated carbon outlet at the bottom of the adsorption tower to the activated carbon inlet at the top of the adsorption tower, that is, the height of the main structure of the tower.

For the design of the flue gas (or waste gas) adsorption tower and its adsorption process, many documents have been disclosed in the prior art, see for example US5932179, JP2004209332A, and JP3581090B2 (JP2002095930A) and JP3351658B2 (JPH08332347A), JP2005313035A. This application will not describe in detail again.

In the present invention, there is no special requirement for the desorption tower, and all desorption towers of the prior art can be used in the present invention. Preferably, the desorption tower is a shell-and-tube vertical desorption tower, in which the activated carbon is input from the top of the tower, flows down through the tube side, and then reaches the bottom of the tower, while the heating gas flows through the shell side, and the heating gas enters from one side of the tower , exchange heat with the activated carbon flowing through the tube side to cool down, and then output from the other side of the tower. In the present invention, there is no special requirement for the desorption tower, and all desorption towers of the prior art can be used in the present invention. Preferably, the desorption tower is a shell-and-tube type (or shell-and-tube type) or shell-and-tube vertical desorption tower, wherein activated carbon is imported from the top of the tower, flows down through the tube side of the upper heating zone, and then reaches a tube in the upper heating zone. A buffer space between the lower cooling zone, then flows through the tube side of the lower cooling zone, and then reaches the bottom of the tower, while the heating gas (or high-temperature hot air) flows through the shell side of the heating zone, and the heating gas (400-500°C ) enters from one side of the heating zone of the desorption tower, conducts indirect heat exchange with the activated carbon flowing through the tube side of the heating zone to cool down, and then outputs from the other side of the heating zone of the tower. The cooling air enters from one side of the cooling zone of the desorption tower, and conducts indirect heat exchange with the decomposed and regenerated activated carbon flowing through the tube side of the cooling zone. After the indirect heat exchange, the cooling air is heated up to 120±20°C, such as about 120°C.

For the design of the activated carbon analysis tower and the regeneration method of activated carbon, many documents have been disclosed in the prior art. JP3217627B2 (JPH08155299A) discloses a analysis tower (i.e. a desorption tower), which adopts double sealing valves, and is sealed with an inert gas. Sieved, water cooled (see Figure 3 in the patent). JP3485453B2 (JPH11104457A) discloses regeneration tower (referring to Fig. 23 and 24), can adopt preheating section, double sealing valve, lead inert gas, air cooling or water cooling. JPS59142824A discloses the use of gas from the cooling section for preheating activated carbon. Chinese patent application 201210050541.6 (Shanghai Kesulphur Co., Ltd.) discloses the energy reuse scheme of the regeneration tower, wherein the drier 2 is used. JPS4918355B discloses the regeneration of activated carbon using blast furnace gas. JPH08323144A discloses the regeneration tower that adopts fuel (heavy oil or light oil), and uses air heating furnace (referring to Fig. 2 of this patent, 11-hot blast stove, 12-fuel supply device). Chinese utility model 201320075942.7 relates to a heating device and an exhaust gas treatment device (coal-fired, air heating) equipped with the heating device, see Figure 2 in the utility model patent.

The analytical tower of the present invention adopts air cooling.

For example, in the case of a desorption tower with a desorption capacity of 20 tons of activated carbon per hour, the traditional process to maintain the temperature in the desorption tower at 430°C requires about 1000Nm ^{3 /h of coke oven gas, about 5500Nm 3 /} h of combustion air, and the external exhaust of hot air About 6000Nm ³ /h; the required cooling air is 60000Nm ³ /h, and the temperature of activated carbon after cooling is 140℃.

Compared with the prior art, the present invention has the following advantages:

1. The multi-nozzle type hot blast stove of the present invention is arranged in two parts: a combustion section and an air mixing section. The combustion section is at high temperature, part of the circulating cooling air is directly fed into the furnace of the combustion section, and the temperature of the combustion section is properly lowered to ensure that the gas is fully burned and the flame temperature is not too high, reducing the formation of high-temperature NOx, achieving the purpose of saving energy and reducing NOx formation.

2. The multi-nozzle hole type hot air stove of the present invention is equipped with a multi-nozzle-hole mixing cylinder in the air-mixing section, and the circulating cooling air passes through the nozzle holes on the multi-nozzle mixing cylinder from the outside to the inside, and is divided into many small streams of fluid and high-temperature hot air. Rapid mixing achieves the purpose of rapid and uniform mixing, reduces the volume of hot blast stove equipment and ensures uniform and stable outlet hot blast temperature.

3. In the present invention, only the fire-resistant and heat-insulating layer is provided on the inner wall of the combustion section, and a small amount of refractory inner lining is used. The whole hot-blast stove adopts the structure of setting an insulating layer on the outer wall, which has less heat dissipation, convenient construction and installation, and can effectively reduce the weight of the equipment. The mixing effect is good, the overall equipment is compact and small in size. Therefore, the multi-nozzle type hot blast stove of the present invention can flexibly adopt horizontal or vertical arrangement according to the needs of the production site.

4. The multi-nozzle type hot blast stove of the present invention adopts a metal structure, which has good overall sealing performance and a wide range of furnace pressure adjustment, which can realize normal operation from zero pressure to positive pressure above 5000Pa.

Description of drawings

Fig. 1 is the schematic diagram of a kind of activated carbon desulfurization and denitrification device comprising activated carbon adsorption tower (B), desorption tower (regeneration tower) (A) and hot blast stove (or heating furnace) (1) of prior art.

Fig. 2 is the schematic diagram of another kind of activated carbon desulfurization and denitrification device of prior art comprising activated carbon adsorption tower (B), desorption tower (regeneration tower) (A) and hot blast stove (or heating furnace) (1).

Reference numerals in Fig. 1 and Fig. 2:

A: Desorption tower; A01: Heating zone of desorption tower; A02: Cooling zone of desorption tower; A03: Intermediate transition zone of desorption tower; A04: Hot air circulation fan; A05: Activated carbon cooling fan; A06: Combustion fan; A07: Gas (or blast furnace gas); A08: activated carbon vibrating screen; A09: nitrogen heater; A10: sulfur-rich gas acid removal system; A11: air; A12: nitrogen; A13: discharge; A14: waste heat utilization; A15: discharge or waste heat Utilization; B: adsorption tower; B01: booster fan; B02: dilute ammonia gas; B03: first activated carbon conveyor; B04: second activated carbon conveyor; B05: hot flue gas from sintering machine; B06: air; B07 : clean flue gas; B08: go to the chimney; 1: hot blast stove. L1: hot air conveying main pipe; L2: general circulation air pipe.

Fig. 3 is a schematic diagram of an existing hot blast stove.

1'-heating burner; 2'-combustion chamber; 3'-partition wall; 4'-circulating cooling air; 5'-air mixing chamber; 6'-flue gas outlet.

Fig. 4 is a schematic front view of the horizontal layout of the multi-nozzle hot blast stove of the present invention.

Fig. 5 is a schematic top view of the horizontal layout of the multi-nozzle hot blast stove of the present invention.

Fig. 6 is a schematic front view of the second horizontal layout of the multi-nozzle hot blast stove of the present invention.

Fig. 7 is a schematic top view of the second horizontal layout of the multi-nozzle hot blast stove of the present invention.

Fig. 8 is a schematic front view of the vertical layout of the multi-nozzle type hot blast stove of the present invention;

Fig. 9 is a side view of the vertical arrangement of the multi-nozzle type hot blast stove of the present invention;

Reference signs: 1-multi-nozzle type hot blast stove; 2-combustion section; 3-air mixing section; 301-outer cylinder of the mixing section; 302-multi-nozzle mixing cylinder of the mixing section; 303-ring Air inlet chamber (or interlayer or annular space or annular space); 304: first hot air outlet; 4-main burner; 401-combustion air interface; 402-coal gas (or gas) interface; 5-circulation of combustion section Air induction duct; 6-circulating air inlet of the first mixing air section; 7-circulating air duct; 701: flow regulating valve; 8-mixing air second section; 801-second hot air outlet; 9-automatic ignition burner; 10- temperature probe.

detailed description

Fig. 1 is the schematic diagram of a kind of common activated carbon desulfurization and denitrification device comprising activated carbon adsorption tower (B), desorption tower (regeneration tower) (A) and hot blast stove (or heating furnace) (1) of prior art.

Fig. 2 is the schematic diagram of another kind of common activated carbon desulfurization and denitrification device that comprises activated carbon adsorption tower (B), desorption tower (regeneration tower) (A) and hot blast stove (or heating furnace) (1) of prior art.

The present invention provides a (horizontal or vertical) multi-nozzle type hot blast stove 1, which includes a combustion section 2, a first air mixing section 3 and an air mixing second section 8. The burner 4 is also provided with a circulating air induction pipe 5 for ventilating the interior of the combustion section 2 outside the combustion section 2, and the air mixing section 3 includes an outer cylinder 301 and an inner cylinder coaxial with the outer cylinder 301 Metal multi-nozzle air mixing cylinder 302, and between the outer cylinder 301 and the multi-nozzle air mixing cylinder 302 as the inner cylinder, there is an annular gap or annular space 303 as (annular) air inlet chamber, where the multi-nozzle air mixing A plurality of spray holes (i.e. air inlet holes) are evenly or substantially evenly distributed on the wall of the barrel 302, the front end of the multi-spray air mixing barrel 302 as the inner cylinder of the air mixing section 3 and the rear end of the combustion section 2 Sealed connection, the rear end of the multi-jet air mixing cylinder 302 is provided with a first hot air outlet 304, the wall of the outer cylinder 301 of the air mixing section 3 is provided with a circulating air inlet 6 and the circulating air inlet 6 is connected to the circulating air duct 7 connect.

In addition, the front end of the second air mixing section 8 is in sealing connection with the rear end of the first hot air outlet 304 (ie, the air outlet end), and a second hot air outlet 801 is provided on the side wall or end of the second air mixing section 8 .

The second hot air outlet 801 communicates with the hot air delivery main pipe L1. The circulating air induction duct 5 and the circulating air duct 7 are connected to the total circulating air duct L2 respectively.

Preferably, the circulation air induction pipe 5 and the circulation air pipe 7 are connected to the total circulation air pipe L2 (eg drawn from the heating zone A01 or the cooling zone A02 of the activated carbon desorption tower) respectively.

Preferably, the sidewall of the front end of the combustion section 2 is also provided with an automatic ignition burner 9; preferably: the automatic ignition burner 9 is arranged near the main burner 4, or the automatic ignition burner (9) is connected with the main burner and (4) Fusion into a combined device.

Preferably, the first hot blast outlet 304 or the second hot blast outlet 801 of the hot blast stove 1 communicates with the hot blast delivery main pipe L1 (eg drawn from the heating zone A01 of the activated carbon desorption tower).

Preferably, the combustion section 2 has a cylindrical structure with a circular, elliptical or rectangular cross section, preferably a cylindrical structure.

Preferably, both the outer cylinder 301 of the air mixing section 3 and the multi-nozzle air mixing cylinder 302 as the inner cylinder have a cylindrical structure with a circular or elliptical cross section.

Preferably, along the length direction and the circumferential direction of the multi-nozzle-hole air-mixing cylinder 302 , the multiple nozzle holes are uniformly or substantially uniformly distributed on the wall of the multi-nozzle-hole air-mixing cylinder 302 .

Preferably, the cross-sectional shape of the nozzle hole is one or more of circular, oval, triangular, quadrangular, pentagonal or hexagonal; preferably, the cross-sectional shape of the nozzle hole is circular.

Preferably, the main burner 4 is provided with a combustion air interface 401 and a gas interface 402 .

Generally, the inlet damper of the circulation fan A04 adjusts the amount of flue gas circulation entering the hot blast stove. In addition, a flow regulating valve 501 may also be provided on the circulating air induction pipe 5 . In addition, a flow regulating valve 701 may also be provided on the circulating air duct 7 .

Preferably, a temperature probe 10 is provided in the combustion section 2 .

In order to reduce the temperature of the hot blast in the combustion section 2, the circulating hot blast from the heating zone of the activated carbon desorption tower is passed into the combustion section 2 via the circulating air duct 5 to reduce the temperature of the hot blast produced by combustion in the combustion section 2. Preferably, a plurality of air inlets are designed along the circumference of the cylindrical combustion section at the front end of the combustion section, and these air inlets are all communicated with the circulating air duct so as to spray hot air evenly around the inner space of the combustion section. Or, preferably, an annular air distribution pipe (not shown) with a plurality of gas injection holes is provided near the end of the combustion section 2 near the main burner 4, so as to spray hot air evenly around the inner space of the combustion section 2.

According to the second embodiment of the present invention, a kind of activated carbon desorption tower device is provided, and it comprises activated carbon desorption tower A and above-mentioned hot blast stove 1, wherein this desorption tower A has: the heating zone A01 of top and the cooling zone of bottom A02, the inlet for inputting the activated carbon to be regenerated at the top of the tower and the outlet of the regenerated activated carbon at the bottom of the tower;

Wherein the first hot blast outlet 304 or the second hot blast outlet 801 of the hot blast stove 1 is communicated with the hot blast inlet of the heating zone A01 on the top of the analysis tower A via the hot blast delivery main pipe L1; and

Wherein the circulating air induction duct 5 and the circulating air duct 7 of the hot blast stove 1 communicate with the total circulating air duct L2 drawn from the hot blast outlet of the heating zone A01 on the top of the analysis tower A (as shown in Figure 1) or two The latter communicates with the total circulation air duct L2 drawn from the air outlet of the cooling zone A02 at the lower part of the analytical tower A (as shown in Figure 2).

As shown in Figure 1, the desulfurization and denitrification device includes an activated carbon adsorption tower (B) (tower height 30 meters, cross-sectional area 120m ² ) and desorption tower (A) (tower height 20 meters, cross-sectional area 15m ² ). Fig. 3 is a schematic diagram of an existing hot blast stove.

Example 1

As shown in Figures 4 and 5, a multi-nozzle type hot blast stove 1 adopts a horizontal arrangement, including a combustion section 2 and an air mixing section 3. The front end of the combustion section 2 is provided with a main burner 4; the side of the combustion section 2 It is equipped with a circulating air induction pipe 5, an automatic ignition burner 9 and a temperature probe 10. The front end of the air mixing section 3 is sealed and connected to the rear end of the combustion section 2 , and the rear end of the air mixing section 3 is provided with a first hot air outlet 304 . A circulating air inlet 6 is provided on the side wall of the air-mixing section 3, and the air-mixing section 3 includes an outer cylinder 301, a multi-nozzle air mixing cylinder 302 as an inner cylinder, and an annular space 303 between them. A circulating air inlet 6 is provided on the wall of the outer cylinder 301 of the air mixing section 3 , and the circulating air inlet 6 is connected to a circulating air pipe 7 . A plurality of spray holes are evenly arranged around the wall of the multi-nozzle air mixing cylinder 302, that is, the spray holes are evenly opened along the length direction of the multi-nozzle hole mixing air cylinder 302 and along the circumferential direction of the multi-nozzle hole mixing air cylinder 302. hole.

In addition, there is also a second air mixing section 8 which is sealed and connected to the first hot air outlet 301 , and a second hot air outlet 801 is provided on the side wall of the second air mixing section 8 . The second hot air outlet 801 communicates with the hot air delivery main pipe L1.

The circulating air induction duct 5 and the circulating air duct 7 are connected to the total circulating air duct L2 respectively. The main burner 4 is provided with a combustion air interface 401 and a gas interface 402 . Both the circulating air induction pipe 5 and the circulating air pipe 7 are provided with flow regulating valves (501 and 701). The inner wall of the combustion section 2 is provided with a heat insulation layer of refractory material, and the outer walls of the combustion section 2, the air mixing section 1 3, and the air mixing section 8 are all provided with an insulating layer.

In practical application, after the desulfurization and denitrification device runs continuously for 1 week, the content of nitrogen oxides remains at 0.024vol% through sampling and analysis of the gas transported from the hot air delivery main pipe L1, while the nitrogen oxide content of the existing technology is as high as 0.1vol% . The temperature of the gas (hot blast) conveyed by the hot blast delivery main pipe L1 is stably maintained at 430-450°C.

For the case where the desorption capacity of the desorption tower is 20 tons of activated carbon per hour, the new process keeps the temperature inside the desorption tower at 430°C, the required coke oven gas is about 700Nm ³ /h, the combustion air is about 4000Nm ³ /h, and the hot air exhausted is about It is 5000Nm ³ /h; the temperature of activated carbon after cooling is below 120°C.

Example 2

As shown in Figures 6 and 7, a multi-nozzle type hot blast stove 1 adopts a horizontal arrangement, including a combustion section 2 and an air mixing section 3. The front end of the combustion section 2 is provided with a main burner 4; It is equipped with a circulating air induction pipe 5, an automatic ignition burner 9 and a temperature probe 10. The front end of the air mixing section 3 is sealed and connected to the rear end of the combustion section 2 , and the rear end of the air mixing section 3 is provided with a first hot air outlet 304 . A circulating air inlet 6 is provided on the side wall of the air-mixing section 3, and the air-mixing section 3 includes an outer cylinder 301, a multi-nozzle air mixing cylinder 302 as an inner cylinder, and an annular space 303 between them. A circulating air inlet 6 is provided on the wall of the outer cylinder 301 of the air mixing section 3 , and the circulating air inlet 6 is connected to a circulating air duct 7 . A plurality of spray holes are evenly arranged around the wall of the multi-nozzle air mixing cylinder 302, that is, the spray holes are evenly opened along the length direction of the multi-nozzle hole mixing air cylinder 302 and along the circumferential direction of the multi-nozzle hole mixing air cylinder 302. hole.

The first hot blast outlet 304 of the hot blast stove 1 communicates with the hot blast delivery main pipe L1.

The circulating air induction duct 5 and the circulating air duct 7 are connected to the total circulating air duct L2 respectively. The main burner 4 is provided with a combustion air interface 401 and a gas interface 402 . Both the circulating air induction pipe 5 and the circulating air pipe 7 are provided with flow regulating valves (501 and 701). The inner wall of the combustion section 2 is provided with a heat insulating layer of refractory material, and the outer walls of the combustion section 2 and the air mixing section 3 are all provided with an insulating layer.

Example 3

As shown in Figures 8-9, the same design as in Embodiment 1 is adopted, except that the multi-nozzle type hot blast stove 1 is vertically arranged.

Claims (9)

1. A multi-nozzle type hot blast stove (1), which comprises a combustion section (2), an air mixing section (3) and an air mixing section (8), Wherein, the front end of the combustion section (2) is provided with a main burner (4) and is provided with an automatic ignition burner (9) and a circulating air draft for ventilation to the interior of the combustion section (2) outside the combustion section (2). pipe (5), The air mixing stage (3) includes an outer cylinder (301) and a metal multi-jet mixing air cylinder (302) coaxial with the outer cylinder (301) as an inner cylinder, and the outer cylinder (301) and the inner cylinder There is an annular gap or an annular space (303) between the multi-nozzle air mixing cylinder (302) of the cylinder as an air inlet chamber, and the multi-nozzle air mixing cylinder (302) is evenly or substantially evenly distributed on the wall of the multi-nozzle air mixing cylinder (302). The front end of the multi-jet air mixing tube (302) used as the inner cylinder of the air mixing section (3) is sealed with the rear end of the combustion section (2), and the rear end of the multi jet hole mixing air tube (302) A first hot air outlet (304) is provided at the end, and a circulating air inlet (6) is provided on the wall of the outer cylinder (301) of the air mixing section (3), and the circulating air inlet (6) is connected with the circulating air duct (7) connect, The front end of the second air mixing section (8) is sealed and connected to the rear end of the first hot air outlet (304), and the side wall or end of the second air mixing section (8) is provided with a second hot air outlet (801). 2. The hot blast stove (1) according to claim 1, characterized in that, the second hot blast outlet (801) communicates with the hot blast delivery main pipe (L1); and/or The circulating air induction duct (5) and the circulating air duct (7) are respectively connected to the general circulating air duct (L2). 3. The hot blast stove (1) according to claim 1 or 2, characterized in that, the side wall of the combustion section (2) is also provided with an automatic ignition burner (9); preferably: an automatic ignition burner ( 9) It is arranged close to the main burner (4), or the automatic ignition burner (9) is integrated with the main burner and (4) into a combined device. 4. The hot blast stove (1) according to any one of claims 1-3, characterized in that the combustion section (2) has a cylindrical structure with a circular or elliptical or rectangular cross section, preferably a cylindrical shape structure; and/or Both the outer cylinder (301) of the air mixing stage (3) and the multi-nozzle air mixing cylinder (302) as the inner cylinder have a cylindrical structure with a circular or elliptical cross section. 5. The hot blast stove (1) according to any one of claims 1-4, characterized in that, along the length direction and the circumferential direction of the multi-nozzle air mixing cylinder (302), the plurality of nozzle holes are evenly distributed Or substantially uniformly distributed on the wall of the multi-nozzle air mixing cylinder (302). 6. The hot blast stove (1) according to any one of claims 1-5, characterized in that, the cross-sectional shape of the nozzle hole is circular, elliptical, triangular, quadrangular, pentagonal or hexagonal One or more of them; preferably, the cross-sectional shape of the nozzle hole is circular. 7. The hot blast stove (1) according to any one of claims 1-6, characterized in that the main burner (4) is provided with a combustion-supporting air interface (401) and a gas interface (402). 8. The hot blast stove (1) according to any one of claims 1-7, characterized in that a temperature probe (10) and a pressure probe are arranged in the combustion section (2). 9. activated carbon desorption tower device, it comprises activated carbon desorption tower (A) and according to the hot blast stove (1) described in any one in claim 1-8, wherein this desorption tower (A) has: the heating zone (A01 of top ) and the cooling zone (A02) of the lower part, the inlet for inputting activated carbon to be regenerated at the top of the tower and the outlet of the activated carbon at the bottom of the tower for output regeneration; Wherein the first hot blast outlet (304) or the second hot blast outlet (801) of the hot blast stove (1) is communicated with the hot blast inlet of the heating zone (A01) on the top of the desorption tower (A) via the hot blast delivery main pipe (L1); and Wherein the circulating air induction pipe (5) and the circulating air pipe (7) of the hot blast stove (1) and the total circulating air pipe (L2) drawn from the hot blast outlet of the heating zone (A01) on the upper part of the analysis tower (A) ) or both are communicated with the total circulation air pipe (L2) drawn from the air outlet of the cooling zone (A02) at the lower part of the analytical tower (A).