CN102784528B - Filter for pulverized coal as fired of pyrolysis furnace - Google Patents

Abstract

The invention discloses a coal dust filter for a coal pyrolysis furnace, which comprises a filter housing, a filter outer top cover, a filter inner top cover, a metal fiber filter net, a waste air inlet pipe, a dust funnel, Exhaust air internal discharge through pipe, waste air external discharge through pipe, waste air inlet through pipe from the bottom to the top is arranged around the filter housing, dust funnel is arranged inside the filter housing, waste air internal discharge through pipe It is arranged on the inner top cover of the filter and above the dust funnel. The inlet of the waste air exhaust pipe is lower than the inlet of the waste air inlet pipe. The waste air exhaust pipe is arranged on the outer top cover of the filter. A metal fiber filter screen is arranged between the inner top cover of the device and the outer top cover of the filter. The pulverized coal filter of the present invention utilizes the thermal buoyancy of the heated air to naturally rise and pass through the metal fiber filter to effectively filter the pulverized coal in the air, without additional energy-consuming devices such as air pumps and fans, and has a simple structure and saves costs. .

Description

Coal dust filter for coal pyrolysis furnace

technical field

The invention relates to a coal powder filter, in particular to a filter for filtering the coal powder in the air heated by the incoming coal of a coal pyrolysis furnace.

Background technique

Most of the coal pyrolysis furnaces (coke ovens) on the market currently use intermittent coking, and the coal feed into the furnace is wet coal. Drying will also affect the air in the housing of the dehydration device; in addition, when using the coal pyrolysis furnace’s own combustion exhaust gas to preheat the coal powder entering the furnace, the coal powder entering the furnace will also be preheated. The air in the preheating chamber of the heating device is heated, and there is a large amount of coal powder in the heated air. If it is directly discharged into the atmosphere, it will cause pollution to the atmosphere.

This impels the inventor to think and develop a kind of pulverized coal filter to carry out dust filtration to the air before being discharged into atmosphere.

Contents of the invention

The invention provides a coal powder filter for a coal pyrolysis furnace, which can effectively filter air dust before being discharged into the atmosphere.

The present invention is realized through the following technical solutions:

A filter for pulverized coal in a coal pyrolysis furnace, including a filter housing, a filter outer top cover, a filter inner top cover, a metal fiber filter screen, a waste air inlet pipe, a dust funnel, and a waste air inside Exhaust through pipe, waste air discharge through pipe, waste air inlet through pipe from bottom to top is set around the filter housing, dust funnel is arranged inside the filter housing, waste air discharge through pipe is set in the filter On the inner top cover of the filter, and above the dust funnel, the inlet of the waste air exhaust pipe is lower than the inlet of the waste air inlet pipe, and the exhaust air exhaust pipe is set on the outer top cover of the filter, and the inner top of the filter A metal fiber filter screen is arranged between the cover and the outer top cover of the filter.

Preferably, the exhaust air inlet duct and the exhaust air inner exhaust duct form a vertical angle to form a cyclone structure in the filter housing.

The pulverized coal filter in the coal pyrolysis furnace of the present invention can effectively filter the pulverized coal in the air through the metal fiber filter net during the natural rise of the thermal buoyancy of the heated air, and does not need additional energy consumption such as air pumps and fans. The device has a simple structure and saves cost.

Description of drawings

The specific implementation manners of the present invention will be described in further detail below in conjunction with the accompanying drawings.

Fig. 1 is a schematic diagram of assembling the furnace coal dust filter of the coal pyrolysis furnace of the present invention in the furnace coal dehydration device;

Figure 2 is an enlarged view of A in Figure 1;

Fig. 3 is a top view schematic diagram of an embodiment of the coal dust filter of the coal pyrolysis furnace of the present invention;

Fig. 4 is a top view schematic diagram of another embodiment of the furnace coal dust filter of the coal pyrolysis furnace of the present invention;

Fig. 5 is a schematic cross-sectional view of the assembly of the coal dust filter of the coal pyrolysis furnace of the present invention in the coal feeding device

Fig. 6 is an enlarged view at C in Fig. 5;

Fig. 7 is the sectional view of the preheater in the preheating device of the coal feeding device involved in the furnace coal pulverized coal filter of the coal pyrolysis furnace of the present invention;

Fig. 8 is a cross-sectional view at a-a place in Fig. 6;

Fig. 9 is a schematic diagram of the furnace coal cooling device involved in the furnace coal pulverized coal filter of the coal pyrolysis furnace of the present invention;

Fig. 10 is a sectional view at b-b in Fig. 9;

Fig. 11 is a schematic diagram of the electrical connections involved in the filter of coal pulverized coal in the coal pyrolysis furnace of the present invention.

Detailed ways

The pulverized coal filter of the coal pyrolysis furnace of the present invention is mainly used in the coal furnace pyrolysis furnace coal dehydration, coal addition, preheating, adjustment and other devices, and several chapters divided into three parts are introduced separately below.

Part 1 Furnace Coal Proportion and Preparation

The coal pyrolysis furnace involved in the present invention can obtain cokes of different grades according to different proportions of coals fed into the furnace.

The steps are as follows: 1) 5 kinds of different coals are selected, which are respectively gas coal, fat coal, coking coal, one-third coking coal and lean coal. 2) Gas coal 20%~40%; fat coal 10%~20%; coking coal 10%~20%; one-third coking coal 15%~30%; lean coal 10%~15%, first mix and then sieve Broken until the broken particles reach below 5mm to form coal into the furnace. Of course, the coal pyrolysis furnace of the present invention is equally applicable to coal into the furnace with other proportions and particle sizes, and does not constitute a restriction on the required coal powder for the coal pyrolysis furnace of the present invention. , but according to the above-mentioned ratio of coal into the furnace, the amount of weak caking coal can be added to more than 40%, which reduces the cost of coal into the furnace and at the same time can obtain high-quality coke, which is very competitive in the market .

Part II Dehydration of incoming coal

At present, most of the coking ovens on the market adopt intermittent coking, and the coal into the furnace is wet coal, so energy consumption increases the cost of coking. Dehydration of the coal entering the coal pyrolysis furnace is performed in advance to save energy. The effect of reducing consumption.

As shown in Figure 1: the described furnace coal dehydration device 1 includes a dehydration frame body 10, a bucket elevator 11, a waste gas dehydrator 12, a pulverized coal filter 13, a silo 14, a dust collector 15, a chimney 16, a furnace inlet Coal conveyor17.

As shown in Fig. 1 and Fig. 2: the waste gas dehydrator 12 includes a dehydrator housing 121, a hot waste gas main inlet pipe 122, a dehydrated waste gas main exhaust pipe 123, a feeder 124, and a waste gas cooling fin 125. A feeder 124 is provided above, and at least one set of waste gas cooling fins 125 is provided below the feeder 124 inside the dehydrator housing 121. The inside of the waste gas cooling fins 125 is provided with a hot waste gas inlet channel 1251 and a dehydration waste gas discharge channel 1252. The hot exhaust gas inlet channel 1251 and the dehydrated exhaust gas exhaust channel 1252 communicate with the hot exhaust gas main inlet pipe 122 and the dehydrated exhaust gas main exhaust pipe 123 respectively. It is beneficial to the drying and dehydration of coal into the furnace.

As shown in Figure 2: the feeding device 124 includes a feeding hopper 1241, a feeding vibrating screen 1242, a feeding channel 1243, and a feeding vibrating screen 1244. A plurality of feeding channels 1243 are provided, and a feeding vibrating screen 1244 is arranged below the feeding channel 1243, and an exhaust gas cooling fin 125 is arranged below the feeding vibrating screen 1244. Above 125 the distribution is more even.

As shown in Figure 2: the exhaust gas cooling fins 125 are arranged in three groups of upper, middle and lower, and the shape of the exhaust gas cooling fins 125 is made into an upward acute angle triangle. That is, an exhaust gas cooling fin 125 in the middle group is just arranged between two adjacent exhaust gas cooling fins 125 in the upper group. Similarly, an exhaust gas cooling fin 125 in the lower group is just arranged between two adjacent exhaust gas cooling fins 125 in the middle group. Between the cooling fins 125, the purpose is to increase the drying area of the coal into the furnace and facilitate the dispersion and sliding of the coal into the furnace.

As shown in Figure 1, Figure 2, and Figure 3: a coal bunker 14 is set under the exhaust gas cooling fin 125, and a pulverized coal filter 13 is placed on the coal bunker 14. Our image is called a pulverized coal respirator, and a pulverized coal filter The device 13 mainly includes a filter housing 131, a waste air inlet pipe 132, a dust funnel 133, a waste air discharge pipe 134, and a waste air discharge pipe 135. The waste air leading to the top enters the through pipe 132, and a dust funnel 133 is arranged inside the filter housing. The inlet 1321 of the inner inlet duct 132 is higher than the inlet 1341 of the exhaust air inner exhaust duct 134, the exhaust air inner exhaust duct 134 is arranged on the filter inner top cover 137, and the exhaust air outer exhaust duct 135 is arranged on the outer top of the filter. On the cover 138 , a metal fiber filter screen 136 is arranged between the filter inner top cover 137 and the filter outer top cover 138 .

As shown in Figure 3: the waste air inlet pipe 132 is arranged in the filter housing 131, the waste air inlet pipe 132 and the exhaust air discharge pipe 134 form a vertical angle to form a cyclone in the filter housing 131 structure.

As shown in Figure 1: the dust collector 15 is connected to the dehydration waste gas main discharge pipe 123, the dust collector 15 is an existing dust removal technology, the dust collector 15 includes a dust collector housing 151, a dust removal chamber 152, and the dehydration waste gas main discharge pipe 123 leads to the dust removal Room 152, the dust removal chamber 152 communicates with the chimney 16 through the induced draft fan 18, and a fly ash discharge pipe 153 is arranged below the dust removal chamber 152. The dust removal chamber 152 can be wet dust removal or dry bag dust removal, here The focus is on wet dust removal. A water spray head 154 is provided above the dust removal chamber in the dust collector housing 151 .

As shown in Figure 1 and Figure 2: the hot exhaust gas enters the exhaust gas inlet channel 1251 inside the exhaust gas cooling fin 125 through the hot exhaust gas main inlet air pipe 122, and then enters the dehydration exhaust gas main exhaust air pipe 123 through the dehydrated exhaust gas discharge channel 1252 inside the exhaust gas cooling fin 125 , and then discharged from the chimney 16 after being cleaned by the water layer in the dust removal chamber 152, the fly ash in the hot waste gas remains in the water layer and is discharged regularly through the fly ash discharge pipe 153, which not only purifies the hot waste gas, but also reduces The discharge temperature of the hot exhaust gas is beneficial to the exhaust, protects the induced draft fan 18, achieves the purpose of clean and environmentally friendly discharge, and responds to the current national requirements for promoting environmentally friendly discharge of exhaust gas.

As shown in Figure 1 and Figure 2: the hot exhaust gas after combustion enters the main intake air pipe 122 of the hot exhaust gas, usually at a temperature of 700 ° C to 800 ° C, and the waste heat of the hot exhaust gas itself is used to heat the exhaust gas cooling fins 125, which can The hot exhaust gas is cooled, thereby dehydrating the coal entering the furnace through the exhaust gas cooling fins 125, and the moisture content of the coal entering the furnace can be kept below 1%, so as to effectively utilize the hot exhaust gas after combustion and save energy consumption.

As shown in Figure 1 and Figure 2: the discharge hopper 111 of the bucket elevator 11 is set above the hopper 1241, and the furnace coal conveyor 17 is set at the bottom of the coal bunker 14.

As shown in Figure 11: this example also includes industrial control center 90, and industrial control center 90 controls the induced draft fan 18, furnace coal conveyor 17 and bucket elevator 11 directly electrically connected with it,

This example also includes the furnace coal electrical controller 901, the furnace coal electrical controller 901 automatically controls the furnace coal conveyor 17, the induced draft fan 18 and the bucket elevator 11 respectively, and the furnace coal electrical controller 901 communicates with the upper 90 industrial control centers are connected to realize the automation of coal dehydration. Of course, from the perspective of electrical control principles, in this example, the coal conveyor 17, the induced draft fan 18 and the bucket elevator 11 can also be directly controlled by the industrial control center 90, so the setting of the coal electrical controller 901 here does not constitute a negative impact on this project. limitation of the scope of protection.

The principle of the coal dehydration method in this example is as follows:

1. The industrial control center 90 transmits the starting signal to the furnace coal electrical controller 901 to the furnace coal conveyor 17, the induced draft fan 18 and the bucket elevator 11, and the bucket elevator 11 first sends the furnace coal that has been proportioned into the dehydration The top of the device housing 121 enters the hopper 1241, passes through the feeding vibrating screen 1242, the feeding channel 1243, the feeding vibrating screen 1244, the exhaust gas cooling fin 125, and finally falls into the coal bunker 14;

2. Pass the hot exhaust gas through the hot exhaust gas main inlet air pipe 122 into the exhaust gas inlet channel 1251 inside the exhaust gas cooling fin 125, and then enter the dehydration exhaust gas main exhaust air pipe 123 through the dehydration exhaust gas discharge channel 1252 inside the exhaust gas cooling fin 125, and pass through the induced draft fan 18 is discharged from the chimney 16 after entering the water layer in the dedusting chamber 152 for cleaning;

3. At the same time, when the coal entering the furnace falls into the coal bunker 14 through the exhaust gas cooling fin 125, it will also heat the air in the cavity of the dehydrator shell 121 and the coal bunker 14. The heated air uses its own heat The buoyant force enters the exhaust air of the pulverized coal filter 13 and enters the through pipe 132 (as shown in Figure 3). Because the inlet 1321 of the waste air entering the through pipe 132 is higher than the inlet 1341 of the exhaust air discharge through pipe 134, the hot exhaust air flows from above. Form a whirlwind and enter the waste air to discharge through pipe 134, and finally discharge through metal fiber filter screen 136 and waste air through pipe 135, and the dust in the waste air will fall into the dust funnel 133 below because of metal fiber filter screen 136 blocking Thereby enter the coal bunker 14 in.

The third part: Coal feeding, preheating, adjustment and cooling

The temperature of the dehydrated coal into the furnace will generally drop to normal temperature after being transported, especially in winter when the temperature is low, and the temperature may be lower, but it is more appropriate to keep the temperature of the coal into the furnace between 200°C and 300°C during coking , so it is necessary to preheat the incoming coal before entering the carbonization chamber of the coal pyrolysis furnace.

Section 1 Furnace Coal Feeding

As shown in Figure 5, the coal feeding device 2 mainly includes a pulverized coal conveyor 21, a pulverized coal bin 22, a pulverized coal distributor 25, a pulverized coal distribution chamber 26, a pulverized coal bin feeding pipe 29, a pulverized coal bin Filter 23.

As shown in Figure 5, the pulverized coal conveyor 21 for entering the furnace adopts a spiral conveying structure, and is arranged above the coal bunker 22 for entering the furnace. A protruding pulverized coal splitter 25 is arranged in the middle of the bottom of the coal bin 22 for entering the furnace, and the coal dust for entering the furnace The bottom of 22 is divided into several pulverized coal distributing chambers 26. In this example, 8 pulverized coal distributing chambers 26 are arranged in total. At the bottom of the pulverized coal distributing chambers 26, the bottom of the pulverized coal distributing chamber 26 is respectively connected with a feeding pipe 29 into the furnace coal bunker and a feeding pipe 29 into the furnace coal bunker. The feeding control valve 24 is arranged on the top.

As shown in Fig. 5 and Fig. 4, the pulverized coal filter 23 (the structure of the pulverized coal filter introduced in the second part of this example is basically the same) is arranged above the furnace coal bunker 22, mainly including a filter housing 231 , the waste air enters through pipe 232, the dust funnel 233, the waste air discharges through pipe 234, and the waste air discharges through pipe 235. The waste air enters through pipe 232 outside the filter housing 231 and is arranged on the filter housing A dust funnel 233 is arranged inside the body 231, and the dust funnel 233 leads to the furnace coal bunker 22, and a waste air internal discharge through pipe 234 is arranged above the dust funnel 233, and the entrance of the waste air into the through pipe 232 is higher than the waste air internal discharge. The entrance of the through pipe 234, the waste air externally entering through pipe 232 and the exhaust air internally discharging through pipe 234 form a vertical angle to form a cyclone structure in the filter housing 231, and the exhaust air internally discharging through pipe 234 is arranged on the inner top cover 237 of the filter , The waste air discharge pipe 235 is arranged on the filter outer top cover 238 , and a metal fiber filter screen 236 is arranged between the filter inner top cover 237 and the filter outer top cover 238 .

In addition, as shown in Figure 11, this example also includes an electrical controller 902 for the coal feeding device. It is also connected with the upper industrial control center 90. Of course, from the perspective of the electrical control principle, the pulverized coal conveyor 21 and the feeding control valve 24 in this example can also be directly controlled by the industrial control center 90, so the coal feeding device is installed here. The controller 902 does not limit the protection scope of this example.

Section 2 Preheating of coal into the furnace

As shown in FIGS. 5 and 6 , the preheating device 39 is placed under the coal feeding device 2 , and the preheating device 39 is located on the top of the coal pyrolysis furnace 9 .

As shown in Figures 6, 7 and 8, the preheating device 39 mainly includes a furnace body 91, an exhaust gas chamber 391, at least one exhaust gas preheating channel 392, and a preheater 393. The furnace body 91 is divided into inner, middle, and The outer three layers of walls 913, 912, 911 (shown in Figure 8), the inner wall 913 form the waste gas chamber 391, the middle wall 912 and the outer wall 911 form the waste gas gathering ring 395, and the waste gas gathering ring 395 is provided with the exhaust gas main outlet 3951, and the exhaust gas preheating channel 392 passes through the inner and middle walls 913, 912 to connect the exhaust gas chamber 391 with the exhaust gas gathering ring 395, and separates the inner wall 913 from the middle wall 912 into several preheating chambers 394 (as shown in Figure 8, there are 8 exhaust gas preheating passages 392 in this example to separate 8 preheating chambers 394), and preheaters 393 are respectively placed in each preheating chamber 394.

As shown in Fig. 7 and Fig. 8: the preheater 393 is cylindrical and adopts steel material, and the preheater 393 includes a cylinder body 3931, a conical splitter 3932, an open funnel 3933, a preheated coal discharge channel 3934, and a cone Shaped splitters 3932 and open funnels 3933 are arranged in groups from top to bottom on the cylinder body 3931 in turn, which is beneficial to uniform preheating of the coal-feeding furnace.

As shown in Fig. 8 and Fig. 6, the furnace body 91 adopts a circular shape to facilitate space priority, and a certain space is reserved between the preheater 393 and the preheating chamber 394, and the hot air in the exhaust gas chamber 391 is used to heat the preheater 393 , heating evenly and stably.

As shown in Figure 6, the furnace body 91 is provided with a temperature measuring hole 3941 leading to the preheating chamber, and the preheating chamber temperature gauge 3942 is arranged at the outlet of the temperature measuring hole 3941 for monitoring the temperature change in the preheating chamber 394 , the furnace body 91 is provided with a temperature measuring hole 3914 leading to the exhaust gas chamber, and the exhaust gas chamber thermometer 3915 is arranged at the outlet of the exhaust gas temperature measuring hole 3914 for monitoring the temperature change of the exhaust gas chamber 391. In addition, on the top of the exhaust gas chamber 391 is set Observation hole 3912, lower observation hole 3913 is set at the bottom of waste gas chamber 391 so that technicians observe the working conditions of waste gas chamber 391 and coal pyrolysis furnace 9 bottoms.

As shown in Figures 5 and 6, the preheating chamber 394 is provided with a preheating waste air discharge channel 396, and the preheating waste air discharge channel 396 leads to the exhaust air of the pulverized coal filter 23 and enters the duct 232, and the preheating chamber The dust-laden hot waste air above 394 is discharged into the waste air and enters the duct 232, which helps the furnace coal in the coal furnace bin 22 fall into the preheating chamber 394 for preheating smoothly.

As shown in Figure 5, Figure 6, and Figure 8, the bottom of the waste gas chamber 391 is provided with a hot waste gas inlet channel 3911, and the hot waste gas after combustion enters from the hot waste gas inlet channel 3911, and enters the waste gas gathering ring 395 through the waste gas preheating channel 392 At last, it is discharged from the exhaust gas main outlet 3951 of the exhaust gas gathering ring 395, and the hot exhaust gas after combustion conducts heat conduction to the exhaust gas preheating channel 392, the inner wall body 913, and the inner layer wall body 912 during the discharge process. The unique structural design of the device 39 is to use the hot exhaust gas discharged from the exhaust gas chamber 391 to heat the air in the preheating chamber 394, so as to preheat the coal falling into the preheater 393, and at the same time, it can Cooling the burned hot exhaust gas discharged from the exhaust gas chamber 391 does not need to consume additional energy, and achieves the purpose of utilizing the waste heat of the burned hot exhaust gas itself.

In addition, as shown in FIG. 11 , this example also includes a preheating temperature monitor 903 for monitoring the temperature data of the preheating chamber temperature gauge 3942 and the exhaust gas chamber temperature gauge 3915 . The preheating temperature monitor 903 is connected with the upper industrial control center 90. Of course, in terms of the electrical control principle, the preheating chamber temperature gauge 3942 and the exhaust gas chamber temperature gauge 3915 can also be directly monitored by the industrial control center 90 in this example, so here Setting the preheating temperature monitor 903 does not limit the protection scope of this example.

Section 3 Adjustment of coal into the furnace after preheating

As shown in Figure 5 and Figure 6, the furnace coal adjustment bin 3, the furnace coal adjustment bin 3 is arranged on the furnace body 91 and is located at the lower part of the preheater 393, the outer periphery of the waste gas chamber 391, and the furnace coal adjustment bin 3 includes small coal Storehouse 31, coal bunker upper and lower material level meter 32,33, small coal bunker temperature gauge 34, small coal bunker lower feedway 35, small coal bunker discharge valve 36.

As shown in Figure 5 and Figure 6, the top of the small coal bunker 31 is connected to the bottom of the preheater 393, the upper and lower material level gauges 32 and 33 of the coal bunker are respectively arranged on the top and bottom of the small coal bunker 31, and the small coal bunker temperature gauge 34 Located in the middle of the small coal bunker 31, the small coal bunker discharge channel 35 is connected to the bottom of the small coal bunker 31 through the small coal bunker discharge valve 36, and the small coal bunker discharge channel 35 leads to the coal pyrolysis furnace carbonization chamber 61 (Fig. 9 shown).

In addition, as shown in Figure 11: this example also includes the electric controller 904 that enters furnace coal adjustment and is used for collecting the material level signal of upper and lower material level meter 32,33 of coal bunker, the temperature signal of small coal bunker thermometer 34, and The opening and closing of the small coal bunker feeding valve 36 is automatically controlled, and the furnace coal adjustment electrical controller 904 is connected with the upper industrial control center 90. Of course, from the perspective of the electrical control principle, in this example, the collection of coal bunker loading and unloading The material level signals of the level gauges 32 and 33 and the temperature signal of the small coal bunker thermometer 34 can also be directly collected by the industrial control center 90, and the opening and closing of the small coal bunker feeding valve 36 is directly controlled by the industrial control center 90, so the furnace is set here. Coal adjustment electrical controller 904 does not constitute a limitation to the protection scope of this example.

In this example, the adjustment method of the furnace coal is as follows:

1. Put the preheated coal into the small coal bunker 31 and pre-store it first. When it is necessary to add coal to the carbonization chamber 61, the industrial control center 90 opens the small coal bunker discharge valve 36 and injects it into the carbonization chamber 61. coal;

2. When it is necessary to stop adding coal to the carbonization chamber, the industrial control center 90 closes the feed valve 36 of the small coal bunker, and stops adding furnace coal to the carbonization chamber 61;

3. When the coal bunker lower level gauge 33 detects that the coal in the small coal bunker 31 is insufficient, the industrial control center 90 opens the feeding control valve 24 to add coal to the small coal bunker 31. When the coal bunker upper material level gauge 32 detects When the coal in the small coal bunker 31 has been filled up, the industrial control center 90 closes the blanking control valve 24, stops adding coal to the small coal bunker 31, and plays a role in regulating the furnace coal entering the carbonization chamber 61.

As shown in Fig. 5 and Fig. 6, the small coal bunker 31 top is also provided with a small coal bunker hot gas discharge channel 37, and the small coal bunker hot gas discharge channel 37 leads to the exhaust air of the coal dust filter 23 and enters the through pipe 232, and the small coal bunker The dust-laden hot air above the bunker 31 can be discharged into the waste air and enter the through pipe 232, which is beneficial to the smooth addition of coal to the small coal bunker 31

Section 4 Cooling of incoming coal before entering the carbonization chamber

As shown in Figure 9, when the small coal bunker lower feeder 35 is injecting coal into the carbonization chamber 61 of the coal pyrolysis furnace, because there is a large amount of raw coal gas produced in the coal pyrolysis process at the top of the carbonization chamber 61, the raw gas temperature is relatively high It will conduct heat conduction to the pipe body of the small coal bunker lower feeder 35 and the furnace body 91, causing the coal into the furnace to easily agglomerate in the small coal bunker lower feeder 35, hindering the coal injection into the carbonization chamber 61, so that the coal into the furnace needs to be Allow to cool.

As shown in Figure 9 and Figure 10, the furnace coal cooling device 5 includes an air inlet pipe 57, an air outlet pipe 51, an air inlet ring pipe 56, an air outlet ring pipe 52, an air inlet branch pipe 54, and an air outlet branch pipe 53. Cooling air passage 55, wherein, air enters through pipe 57 and air enters ring pipe 56, and air discharge through pipe 51 communicates with air discharge ring pipe 52, and air enters ring pipe 56, and air discharge ring pipe 52 is respectively arranged on the furnace body 91 Around, the air inlet ring pipe 56 and the air outlet ring pipe 52 are respectively connected with an air inlet branch pipe 54 and an air outlet branch pipe 53, wherein the air inlet branch pipe 54 is connected under the cooling air duct 55, and the air outlet branch pipe 53 is connected to the cooling air duct 55 Above, the small coal bunker lower channel 35 passes through the cooling air channel 55 and leads to the carbonization chamber 61 .

As shown in Fig. 10 and Fig. 9, since the body of furnace 91 is designed to be annular, 8 small coal bunkers 31 for coal injection are arranged around it, which is beneficial to evenly add coal around the carbonization chamber 61, so the cooling air duct 55 and the small The quantity correspondence of coal bunker unloading passage 35 is also 8, when air enters successively from air into duct 57, air enters ring pipe 56, air enters branch pipe 54, cooling air duct 55, then discharges branch pipe 53 from air, air discharges ring Pipe 52 and air are discharged in the duct 51, and the coal into the furnace in the lower feeder 35 of the small coal bunker is cooled by using the cooling air duct 55 to effectively prevent the coal into the furnace from agglomerating in the lower feeder 35 of the small coal bunker. Realize smooth coal injection in the carbonization chamber 61.

In addition, the small coal bunker lowering channel 35 is mainly close to the inner side of the carbonization chamber 61 and is greatly affected by the heat of the raw gas, so the inner side wall 351 of the small coal bunker lowering channel 35 is placed in the cooling air duct 55, and the small coal bunker The outer wall 352 of the discharge channel 35 is exposed to the air, and the natural air is used for cooling, reducing the air volume blown into the cooling air channel 55, thereby saving energy consumption.

Claims (2)

1. A furnace coal dust filter of a coal pyrolysis furnace is characterized in that: it comprises a filter housing, a filter outer top cover, a filter inner top cover, a metal fiber filter screen, waste air entering a duct, Dust funnel, waste air internal discharge pipe, waste air external discharge pipe, waste air inlet pipe from the bottom to the top is arranged around the filter housing, a dust funnel is arranged inside the filter housing, and the waste air inside The discharge through pipe is set on the inner top cover of the filter and is located above the dust funnel. The inlet of the waste air exhaust through pipe is lower than the inlet of the waste air into the through pipe. , a metal fiber filter screen is arranged between the inner top cover of the filter and the outer top cover of the filter. 2. The pulverized coal filter for entering a coal pyrolysis furnace according to claim 1, characterized in that: said waste air enters through pipe and waste air discharges through pipe to form a vertical angle in the filter A cyclone structure is formed inside the casing.