阅读说明：本技术 一种降低干熄焦炉中焦炭烧损率的系统和方法 (System and method for reducing coke burning loss rate in dry quenching furnace ) 是由 徐荣广 关少奎 黄海龙 李东涛 王奇 王进刚 谢金平 曹贵杰 刘洋 马超 代鑫 于 2020-06-08 设计创作，主要内容包括：本发明涉及焦化技术领域,具体涉及一种降低干熄焦炉中焦炭烧损率的系统和方法。该系统包括：干熄焦炉、第一除尘装置、余热锅炉、第二除尘装置、循环风机、副省煤器和除湿装置；干熄焦炉的出风口依次经过第一除尘装置、余热锅炉、第二除尘装置、循环风机、副省煤器连接除湿装置的进风口；除湿装置的出风口,连接干熄焦炉的进风口。本发明在循环气体的循环路径上增设了除湿装置,能够有效降低进入干熄焦炉的循环气体的含水量,从而有效地降低了干熄焦炉中焦炭烧损率。(The invention relates to the technical field of coking, in particular to a system and a method for reducing the burning loss rate of coke in a dry quenching furnace. The system comprises: the system comprises a dry quenching furnace, a first dust removal device, a waste heat boiler, a second dust removal device, a circulating fan, an auxiliary economizer and a dehumidification device; an air outlet of the dry quenching furnace sequentially passes through a first dust removal device, a waste heat boiler, a second dust removal device, a circulating fan and an auxiliary economizer to be connected with an air inlet of a dehumidification device; and the air outlet of the dehumidifying device is connected with the air inlet of the dry quenching furnace. According to the invention, the dehumidifying device is additionally arranged on the circulating path of the circulating gas, so that the water content of the circulating gas entering the dry quenching furnace can be effectively reduced, and the coke burning loss rate in the dry quenching furnace is effectively reduced.)

1. A system for reducing the rate of coke burn in a dry quenching furnace, the system comprising: the system comprises a dry quenching furnace, a first dust removal device, a waste heat boiler, a second dust removal device, a circulating fan, an auxiliary economizer and a dehumidification device;

the air outlet of the dry quenching furnace is connected with the air inlet of the dehumidifying device through the first dust removing device, the waste heat boiler, the second dust removing device, the circulating fan and the auxiliary economizer in sequence;

and the air outlet of the dehumidifying device is connected with the air inlet of the dry quenching furnace.

2. The system of claim 1, wherein the dehumidifying means comprises a first rotary dehumidifier and a first auxiliary fan;

the air inlet of the first rotary dehumidifier is connected with the air outlet of the first auxiliary fan;

the air outlet of the first rotary dehumidifier is connected with the air outlet of the dehumidifying device;

and the air inlet of the first auxiliary fan is connected with the air inlet of the dehumidifying device.

3. The system of claim 2, wherein the air outlet of the first auxiliary blower, the air outlet of the first rotary dehumidifier and the regeneration tail gas outlet are provided with detection sensors for detecting the temperature, humidity and composition of the passing gas.

4. The system of claim 1, wherein the dehumidification device comprises a second rotary dehumidifier, a third rotary dehumidifier, and a second auxiliary blower;

the air inlet of the second rotary dehumidifier is connected with the air outlet of the second auxiliary fan through a first control valve;

the air outlet of the second rotary dehumidifier is connected with the air outlet of the dehumidifying device through a second control valve;

an air inlet of the third rotary dehumidifier is connected with an air outlet of the second auxiliary fan through a third control valve;

the air outlet of the third rotary dehumidifier is connected with the air outlet of the dehumidifying device through a fourth control valve;

and the air inlet of the second auxiliary fan is connected with the air inlet of the dehumidifying device.

5. The system of claim 4, wherein the air outlet of the dehumidifier, the air outlet of the second auxiliary blower, the regeneration exhaust port of the second rotary dehumidifier and the regeneration exhaust port of the third rotary dehumidifier are respectively provided with a detection sensor for detecting the temperature, humidity and composition of the passing gas.

6. The system of claim 1, wherein the air outlet of the dry quenching oven is located at a circulating air duct of the dry quenching oven.

7. A method for reducing the coke burn rate in a dry quenching furnace applied to the system of any of claims 1 to 6, wherein the method comprises:

the moisture content of the recycle gas entering the dry quenching oven is reduced to a value less than the first value using a dehumidification device.

8. The method of claim 7, wherein after the reducing the water content of the cycle gas entering the dry quenching oven to a value less than the first value using a dehumidification device, the method further comprises:

detecting the water content of the circulating gas passing through the gas outlet of the dehumidifying device;

and if the water content of the circulating gas passing through the gas outlet of the dehumidifying device is larger than or equal to a first numerical value, sending a fault alarm signal of the dehumidifying device.

Technical Field

The invention relates to the technical field of coking, in particular to a system and a method for reducing the burning loss rate of coke in a dry quenching furnace.

Background

The dry quenching technology has the advantages of energy conservation, environmental protection, coke quality improvement and the like, and is supported by national encouragement and policy. Since the introduction of the dry quenching technology in China in the 80 s of the 20 th century, great achievements in the aspects of digestion and absorption and technical upgrading are achieved, and part of the technologies and indexes reach the international advanced level. Up to now, the coke dry quenching device which is put into production in China exceeds 200 sets, and a series of coke dry quenching devices with different coke processing capacities are formed, so that the requirements of different types of coking production enterprises can be met.

Due to the presence of a certain amount of O in the circulating gas in the dry quenching furnace₂Easy to generate oxidation-reduction reaction with coke,therefore, the coke burning loss phenomenon generally exists in the current dry quenching process, and the coke burning loss rate design value is generally 0.9-1.0%. However, the actual burning loss rate of the coke per unit is higher than the designed value and even reaches more than 2 percent. The burning loss of the coke not only can cause the ash content of the coke to increase, but also can cause the waste of coke resources.

Disclosure of Invention

The invention aims to provide a system and a method for reducing the coke burning loss rate in a dry quenching furnace, so as to reduce the coke burning loss rate in the dry quenching furnace.

In order to achieve the above object, the embodiments of the present invention provide the following solutions.

In a first aspect, embodiments of the present invention provide a system for reducing a coke burn rate in a dry quenching furnace, the system comprising: the system comprises a dry quenching furnace, a first dust removal device, a waste heat boiler, a second dust removal device, a circulating fan, an auxiliary economizer and a dehumidification device;

the air outlet of the dry quenching furnace is connected with the air inlet of the dehumidifying device through the first dust removing device, the waste heat boiler heating pipeline, the second dust removing device, the circulating fan and the auxiliary economizer in sequence;

and the air outlet of the dehumidifying device is connected with the air inlet of the dry quenching furnace.

In a possible embodiment, the dehumidification device comprises a first rotary dehumidifier and a first auxiliary fan;

the air inlet of the first rotary dehumidifier is connected with the air outlet of the first auxiliary fan;

the air outlet of the first rotary dehumidifier is connected with the air outlet of the dehumidifying device;

and the air inlet of the first auxiliary fan is connected with the air inlet of the dehumidifying device.

In a possible embodiment, the air outlet of the first auxiliary blower, the air outlet of the first rotary dehumidifier and the regeneration tail gas port are provided with detection sensors for detecting the temperature, humidity and composition of the passing gas.

In a possible embodiment, the dehumidification device comprises a second rotary dehumidifier, a third rotary dehumidifier and a second auxiliary fan;

the air inlet of the second rotary dehumidifier is connected with the air outlet of the second auxiliary fan through a first control valve;

the air outlet of the second rotary dehumidifier is connected with the air outlet of the dehumidifying device through a second control valve;

an air inlet of the third rotary dehumidifier is connected with an air outlet of the second auxiliary fan through a third control valve;

the air outlet of the third rotary dehumidifier is connected with the air outlet of the dehumidifying device through a fourth control valve;

and the air inlet of the second auxiliary fan is connected with the air inlet of the dehumidifying device.

In a possible embodiment, the air outlet of the dehumidifying device, the air outlet of the second auxiliary blower, the regeneration exhaust port of the second rotary dehumidifier and the regeneration exhaust port of the third rotary dehumidifier are provided with detection sensors for detecting the temperature, humidity and composition of the passing gas.

In a possible embodiment, the air outlet of the dry quenching oven is located at the circulating air duct of the dry quenching oven.

In a second aspect, an embodiment of the present invention provides a method for reducing a coke burn-out rate in a dry quenching furnace, which is applied to the system according to any one of the first aspect, and the method includes:

the moisture content of the recycle gas entering the dry quenching oven is reduced to a value less than the first value using a dehumidification device.

In a possible embodiment, after the reducing the water content of the recycle gas entering the dry quenching furnace to a value less than the first value using the dehumidifying device, the method further comprises:

detecting the water content of the circulating gas passing through the gas outlet of the dehumidifying device;

and if the water content of the circulating gas passing through the gas outlet of the dehumidifying device is larger than or equal to a first numerical value, sending a fault alarm signal of the dehumidifying device.

Compared with the prior art, the invention has the following advantages and beneficial effects:

according to research and analysis, the oxidation-reduction reaction between water in the circulating gas of the dry quenching furnace and coke at 700-900 ℃ is considered to be the main reason for causing the burning loss rate of the coke to be larger than the designed value. According to the invention, the dehumidifying device is additionally arranged on the circulating path of the circulating gas, so that the water content of the circulating gas entering the dry quenching furnace can be effectively reduced, and the coke burning loss rate in the dry quenching furnace is effectively reduced.

Drawings

In order to more clearly illustrate the embodiments of the present specification or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present specification, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a connection of a possible system for reducing the rate of coke burn in a dry quenching furnace according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a possible system for reducing the rate of coke burn in a dry quenching furnace according to an embodiment of the invention;

FIG. 3 is a schematic diagram of a possible dehumidification apparatus according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a possible dehumidification apparatus according to an embodiment of the present invention;

fig. 5 is a flow chart of a possible method for reducing the coke burn rate in a dry quenching furnace according to an embodiment of the invention.

Description of reference numerals: 1 is a dry quenching furnace, 11 is a circulating air duct, 2 is a first dust removal device, 3 is a waste heat boiler, 4 is a second dust removal device, 5 is a circulating fan, 6 is an auxiliary economizer, 7 is a dehumidification device, 11 is a circulating air duct, 71 is a first rotary dehumidifier, 711 is an air inlet of the first rotary dehumidifier, 712 is an air outlet of the first rotary dehumidifier, 713 is a gas generating port of the first rotary dehumidifier, 714 is a gas generating tail port of the first rotary dehumidifier, 72 is a first auxiliary fan, 721 is an air inlet of the first auxiliary fan, 722 is an air outlet of the first auxiliary fan, 73 is a detection sensor, 74 is a second rotary dehumidifier, 741 is an air inlet of the second rotary dehumidifier, 742 is an air outlet of the second rotary dehumidifier, 743 is a gas generating port of the second rotary dehumidifier, 744 is a gas generating tail port of the second rotary dehumidifier, 75 is a third rotary dehumidifier, 751 is an air inlet of the third rotary dehumidifier, 752 is an air outlet of the third rotary dehumidifier, 753 is a gas generating port of the third rotary dehumidifier, 754 is a gas generating tail gas port of the third rotary dehumidifier, 76 is a second auxiliary fan, 761 is an air inlet of the second auxiliary fan, and 762 is an air outlet of the second auxiliary fan.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art based on the embodiments of the present invention belong to the scope of protection of the embodiments of the present invention.

At present, the research and analysis aiming at coke burning loss in the dry quenching process generally holds that CO in a dry quenching furnace₂Has a high content of CO at 700-800 deg.C₂Namely, the oxidation-reduction reaction with the coke begins to generate CO, which is an important reason for coke burning loss in the dry quenching process. Therefore, the scheme for reducing the coke burning loss rate in the existing dry quenching process is mostly to remove CO₂Scheme for reducing CO in dry quenching furnace₂The coke content of the coke reaches the purpose of reducing the burning loss rate of the coke.

However, the inventors of the present invention have been on the way to conventional CO removal₂The scheme has been found in practical tests that it does not reduce the coke burn rate very well. After further analysis, the inventors found that CO₂The average of the initial temperatures for redox reactions with coke is close to 1000 c, approximately 925 c to 1040 c. Since the maximum temperature in the coke dry quenching system is equivalent to the initial temperature of the reaction, the reaction rate is very highLow, therefore CO in the recycle gas₂The content of (b) is not a main reason why the burning loss rate of coke in the dry quenching furnace is larger than a design value.

After further research and analysis, the inventor finds that the water content in the circulating gas is the main reason that the coke burning loss rate in the dry quenching furnace is larger than the designed value. The coke can be oxidized and reduced with water at high temperature to generate CO and H₂The reaction was started at approximately 760 ℃. The highest temperature in the coke dry quenching system (roughly 960 ℃) is far higher than the reaction initiation temperature, so the reaction rate is fast, a part of coke is easy to react with moisture in the circulating gas, and the coke loss rate in the coke dry quenching furnace is larger than the designed value.

Therefore, the embodiment of the invention provides a possible system for reducing the coke burning loss rate in a dry quenching furnace. Referring to fig. 1, fig. 1 is a schematic connection diagram of an embodiment of the system, which specifically includes a dry quenching furnace 1, a first dust removal device 2, a waste heat boiler 3, a second dust removal device 4, a circulating fan 5, an auxiliary economizer 6 and a dehumidification device 7.

Wherein, the air outlet of the coke dry quenching furnace 1 is connected with the air inlet of the dehumidifying device 7 through the first dust removing device 2, the waste heat boiler 3, the second dust removing device 4, the circulating fan 5 and the auxiliary economizer 6 in sequence; and the air outlet of the dehumidifying device 7 is connected with the air inlet of the dry quenching furnace 1.

Specifically, the first dust removing device 2 and the second dust removing device 4 may be an existing gravity dust remover, an electrostatic adsorption dust remover, or a cyclone dust remover.

Specifically, the exhaust-heat boiler 3 can introduce the heat of the high-temperature gas blown out from the air outlet of the dry quenching furnace 1 into the exhaust-heat boiler to heat water in the exhaust-heat boiler for power generation, hot water supply, or the like, thereby reducing the temperature of the circulating gas and reasonably utilizing the heat energy of the circulating gas.

Specifically, the circulating fan 5 may provide wind pressure to the circulating gas so that the circulating gas can be blown into the dry quenching furnace 1.

Specifically, the sub-economizer 6 serves to further lower the temperature of the circulating gas.

Specifically, the dehumidifier 7 may be an existing gas dehumidifier, such as an activated carbon dehumidifier, a silica gel dehumidifier, or the like.

In a preferred example, the air outlet of the dry quenching furnace is positioned at the circulating air duct of the dry quenching furnace.

By means of the arrangement, the pressure and the air speed in the circulating air duct 11 can be utilized to facilitate the circulating gas to be blown out of the dry quenching furnace 1.

Fig. 2 is a schematic structural diagram of a possible system for reducing the coke burn-out rate in a dry quenching furnace according to the embodiment. Wherein, a gravity dust collector is selected as the first dust removing device 2, and a cyclone dust collector is selected as the second dust removing device 4. And the exhaust gas containing particles and harmful substances blown out from the mouth, the inside, the coke outlet and the dehumidifying device 7 of the dry quenching furnace 1 is also collected and treated uniformly and then discharged into the air.

In a possible embodiment, in order to save the dehumidification cost of this embodiment, a rotary dehumidifier is selected to dehumidify the circulating gas, and after the adsorption material in the rotary dehumidifier absorbs water, the adsorption material can be subjected to desorption treatment by blowing hot air, so that the rotary dehumidifier can be used repeatedly. Fig. 3 is a schematic connection diagram of a dehumidifying apparatus according to this embodiment.

The specific scheme is as follows: the dehumidifying device 7 comprises a first rotary dehumidifier 71 and a first auxiliary fan 72;

an air inlet 711 of the first rotary dehumidifier 71 is connected with an air outlet 722 of the first auxiliary fan 72;

the air outlet 712 of the first rotary dehumidifier 71 is connected with the air outlet of the dehumidifier 7;

the air inlet 721 of the first auxiliary blower 72 is connected to the air inlet of the dehumidifier 7.

Specifically, the first rotary dehumidifier 71 is provided with an air inlet 711, an air outlet 712, a gas generating port 713 and a tail gas generating port 714. Wherein, the gas inlet 711 is communicated with the gas outlet 712 for circulating gas in the coke dry quenching furnace 1 to pass through; the gas generating port 713 is communicated with the tail gas generating port 714 and is used for introducing high-temperature generated gas into the gas generating port 713, desorbing the adsorbing material in the first rotary dehumidifier 71 to generate tail gas and discharging the tail gas from the tail gas generating port 714.

In a possible embodiment, the air outlet 722 of the first auxiliary blower 72, the air outlet 712 of the first dehumidifier 71 and the regeneration air outlet 714 are provided with detection sensors 73 for detecting the temperature, humidity and composition of the passing gas.

Specifically, through these detection sensors, the working state and the working capacity of each part of the dehumidification device can be clearly known, so that a technician can be timely notified when the dehumidification device fails or the dehumidification capacity is reduced.

In a possible embodiment, in order to meet the requirement of uninterrupted production in a factory environment, the embodiment further provides a solution, as shown in fig. 4, a schematic connection diagram of a dehumidification device provided in the embodiment is provided.

The specific scheme is as follows: the dehumidifying device 7 comprises a second rotary dehumidifier 74, a third rotary dehumidifier 75 and a second auxiliary fan 76;

the air inlet 741 of the second rotary dehumidifier 74 is connected to the air outlet 762 of the second auxiliary fan 76 through a first control valve;

the air outlet 742 of the second rotary dehumidifier 74 is connected with the air outlet of the dehumidifying device 7 through a second control valve;

an air inlet 751 of the third rotary dehumidifier 75 is connected with an air outlet 762 of the second auxiliary fan 76 through a third control valve;

the air outlet 752 of the third rotary dehumidifier 75 is connected with the air outlet of the dehumidifier 7 through a fourth control valve;

the air inlet 761 of the second auxiliary blower 76 is connected to the air inlet of the dehumidifying apparatus 7.

Specifically, when the second rotary dehumidifier works, the third rotary dehumidifier can perform desorption treatment, and when the second rotary dehumidifier performs dehumidification for a period of time, the dehumidification capacity is reduced, the second rotary dehumidifier is directly converted into a desorption working state, and the third rotary dehumidifier is switched to perform dehumidification. In this way, the dehumidifying apparatus in the present embodiment can continuously perform the dehumidifying operation without a gap.

Specifically, the second dehumidifier 74 is provided with an air inlet 741, an air outlet 742, a gas generating port 743 and a tail gas generating port 744. Wherein, the gas inlet 741 is communicated with the gas outlet 742 for circulating gas in the dry quenching furnace 1 to pass through; the gas generating port 743 is communicated with the gas generating tail port 744 and is used for introducing high-temperature gas from the gas generating port 743, desorbing the adsorbing material in the second rotary dehumidifier 74 to generate gas and discharging the gas from the gas generating tail port 744.

Specifically, the third rotary dehumidifier 75 is provided with an air inlet 751, an air outlet 752, a gas generating port 753 and a gas generating tail gas port 754. Wherein, the gas inlet 751 is communicated with the gas outlet 752 for circulating gas in the dry quenching furnace 1 to pass through; the gas generating port 753 is communicated with the gas generating tail gas port 754, and is used for introducing high-temperature gas from the gas generating port 753, desorbing the adsorbing material in the third rotary dehumidifier 75, converting the gas into gas generating tail gas, and discharging the gas generating tail gas from the gas generating tail gas port 754.

In a possible embodiment, the air outlet of the dehumidifying apparatus 7, the air outlet 762 of the second auxiliary blower 76, the regeneration exhaust 744 of the second rotary dehumidifier 74 and the regeneration exhaust 754 of the third rotary dehumidifier 75 are all provided with a detection sensor 73 for detecting the temperature, humidity and composition of the passing gas.

Specifically, through these detection sensors, the working state and the working capacity of each part of the dehumidification device can be clearly known, so that a technician can be timely notified when the dehumidification device fails or the dehumidification capacity is reduced.

Based on the same inventive concept as the method, the embodiment of the invention also provides a method for reducing the coke burning loss rate in the dry quenching furnace, which is applied to any one of the system embodiments, and the method comprises the step 1.

Step 1, the moisture content of the recycle gas entering the dry quenching furnace 1 is reduced to a value less than a first value using a dehumidifying device 7.

Specifically, the selection of the first numerical value can be realized by counting the specific coke loss caused by different water contents of the circulating gas in the dry quenching furnace, and combining with specific dehumidification and scientific selection, so that the loss of the moisture in the circulating gas to the coke is reduced as far as possible at reasonable cost.

In a possible embodiment, after the use of the dehumidifying means to reduce the water content of the recycle gas entering the dry quenching oven to a value less than the first value, the method further comprises steps 2 to 3.

And 2, detecting the water content of the circulating gas passing through the gas outlet of the dehumidifying device.

Specifically, a detection sensor can be arranged at the gas outlet of the dehumidifying device, so that the detection of the water content of the circulating gas can be realized.

And 3, if the water content of the circulating gas passing through the gas outlet of the dehumidifying device is larger than or equal to a first numerical value, sending a fault alarm signal of the dehumidifying device.

Specifically, when the water content of the circulating gas after passing through the dehumidifier is still greater than or equal to the first value, it indicates that the dehumidifying capability of the dehumidifier is insufficient, and the dehumidifying effect of the dehumidifying material of the dehumidifier is reduced, so that the dehumidifier or the dehumidifying material needs to be replaced with a new one, or the dehumidifier may malfunction.

Specifically, the fault alarm signal may be in the form of an audible and visual alarm to attract the attention of a technician, or may be in the form of a software alarm message to send an alarm to the technician in the monitoring room.

The technical scheme provided by the embodiment of the invention at least has the following technical effects or advantages:

according to research and analysis of the embodiment of the invention, the oxidation-reduction reaction of water in the circulating gas of the dry quenching furnace and coke in a high-temperature section (760-960 ℃) of a dry quenching system is considered to be the main reason for the loss rate of the coke to be larger than the designed value. According to the embodiment of the invention, the dehumidifying device is additionally arranged on the circulating path of the circulating gas, so that the water content of the circulating gas entering the dry quenching furnace can be effectively reduced, and the coke burning loss rate of the dry quenching furnace is effectively reduced.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.