A coke oven positive pressure baking process

Abstract

The present application discloses a kind of coke oven positive pressure baking process, comprising the following method steps: step one: install positive pressure baking equipment in one side of coke oven, connect gas pipeline with the air inlet pipe of positive pressure baking equipment.The present application can evaporate most of the moisture of masonry through chimney by controlling the time of hot gas entering for 25 days, and the temperature of hot gas entering is 250 DEG C±30 DEG C, to avoid rapid heating, and the lining of furnace body is damaged due to the expansion of a large amount of water vaporization when coke oven heats up sharply.Then by controlling the time of hot gas entering for 20 days, and the temperature of hot gas entering is 350 DEG C±20 DEG C, then by controlling the time of hot gas entering for 23 days, and the temperature of hot gas entering is 520 DEG C±20 DEG C, then by controlling the time of hot gas entering for 14 days, and the temperature of hot gas entering is 600-900 DEG C, gradually preheat the coke oven, to avoid thermal stress caused by rapid heating to damage the coke oven, while the baking time is shortened, and the cost of baking is reduced.

Description

Technical Field

[0001] This invention relates to the field of positive pressure oven technology, specifically a positive pressure oven drying process for coke ovens. Background Technology

[0002] Coke oven drying is the process of raising the temperature of a coke oven from ambient temperature to the temperature required for normal heating (or coal charging). This process is crucial and complex, significantly impacting the lifespan of the coke oven. Currently, coke oven drying methods can be divided into two types: negative pressure drying and positive pressure drying. In negative pressure drying, the main driving force for air and exhaust gases is the chimney suction, while in positive pressure drying, the main driving force is the blower. Positive pressure drying ensures that the entire oven maintains positive pressure throughout the drying process, and due to its more scientific technology, it is gaining increasing market acceptance.

[0003] Existing positive pressure oven drying technology has the following shortcomings: the drying time is relatively long, which not only affects the normal use time of the coke oven, but also increases the cost of drying the oven. At the same time, the rapid heating can easily generate thermal stress that can damage the inside of the coke oven. Therefore, we propose a positive pressure oven drying process for coke ovens. Summary of the Invention

[0004] The purpose of this invention is to provide a positive pressure drying process for coke ovens, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a coke oven positive pressure drying process, comprising the following method steps:

[0006] Step 1: Install the positive pressure drying oven equipment on one side of the coke oven, connect the gas pipeline to the air inlet pipe of the positive pressure drying oven equipment, connect the gas and air outlets of the positive pressure drying oven equipment to the burner, install the burner in the carbonization chamber, and complete the installation of the drying oven pipeline and equipment;

[0007] Step 2: Preheating period, control the temperature of the hot air continuously blown into the carbonization chamber by the positive pressure oven equipment at 250℃±30℃, and preheat for 25 days and nights;

[0008] Step 3: Initial heating, control the temperature of the hot air continuously blown into the carbonization chamber by the positive pressure oven equipment at 350℃±20℃, and start heating for 20 days and nights;

[0009] Step 4: Mid-term heating, control the temperature of the hot air continuously blown into the carbonization chamber by the positive pressure oven equipment at 520℃±20℃, mid-term heating for 23 days and nights;

[0010] Step 5: Later stage of heating, control the temperature of the hot air continuously blown into the carbonization chamber by the positive pressure oven equipment to be between 600 and 900℃, and heat up for 14 days and nights.

[0011] In a preferred embodiment of the present invention, the gas pipeline in step one is sealed to the air inlet pipe of the positive pressure oven through a flange.

[0012] In a preferred embodiment of the present invention, during the preheating period in step two, the temperature is 250℃±30℃, which can evaporate most of the moisture in the masonry and quickly discharge it through the chimney, avoiding rapid heating. When the coke oven heats up rapidly, the large amount of water vaporization and expansion will damage the furnace lining.

[0013] In a preferred embodiment of the present invention, the initial heating, intermediate heating and late heating in steps three, four and five are used to gradually preheat the coke oven, so as to avoid thermal stress caused by rapid heating and damage to the coke oven.

[0014] In a preferred embodiment of the present invention, the expansion rate inside the coke oven in step three is 0.034% ± 0.001%.

[0015] In a preferred embodiment of the present invention, the expansion rate inside the coke oven in step four is 0.04%.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] This invention utilizes a positive pressure oven to continuously introduce hot gas generated by the burner into the carbonization chamber. By controlling the hot gas introduction time for 25 days and nights, and the initial temperature of the hot gas at 250℃±30℃, most of the moisture in the masonry can be evaporated and quickly discharged through the chimney, avoiding rapid heating. Rapid heating of the coke oven can damage the furnace lining due to the large amount of moisture vaporizing and expanding. Further, by controlling the hot gas introduction time for 20 days and nights, and the initial temperature of the hot gas at 350℃±20℃, then for 23 days and nights, and the initial temperature of the hot gas at 520℃±20℃, and finally for 14 days and nights, and the initial temperature of the hot gas at 600-900℃, the coke oven is gradually preheated. This prevents thermal stress caused by rapid heating from damaging the coke oven interior, while also shortening the oven drying time and reducing drying costs. Attached Figure Description

[0018] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0019] Figure 1 This is a process flow diagram of a positive pressure drying oven for coke ovens according to the present invention;

[0020] Figure 2 This is a coke oven temperature rise curve diagram of an embodiment of the positive pressure drying process of a coke oven according to the present invention;

[0021] Figure 3This is a coke oven temperature rise curve diagram, which is a comparative example of the positive pressure drying process of a coke oven according to the present invention. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0023] Please see Figure 1 This invention provides a technical solution: a positive pressure oven drying process for coke ovens, comprising the following steps: Step 1: Installing a positive pressure oven drying device on one side of the coke oven, connecting a gas pipeline to the air inlet pipe of the positive pressure oven drying device, connecting the gas and air outlets of the positive pressure oven drying device to a burner, and installing the burner in the carbonization chamber, thus completing the installation of the oven drying pipeline and equipment; Step 2: Preheating period, controlling the temperature of the hot air continuously blown into the carbonization chamber by the positive pressure oven drying device at 250℃±30℃, for 25 days and nights; Step 3: Initial heating, controlling the temperature of the hot air continuously blown into the carbonization chamber by the positive pressure oven drying device at 350℃±20℃, for 20 days and nights; Step 4: Mid-term heating, controlling the temperature of the hot air continuously blown into the carbonization chamber by the positive pressure oven drying device at 520℃±20℃, for 23 days and nights; Step 5: Final heating, controlling the temperature of the hot air continuously blown into the carbonization chamber by the positive pressure oven drying device at 600-900℃, for 14 days and nights.

[0024] Example 1

[0025] The hot gas generated by the burner is continuously introduced into the carbonization chamber through a positive pressure drying oven. The temperature of the hot gas continuously introduced into the carbonization chamber is controlled at 250℃±30℃ for 25 days and nights of preheating. Then, the temperature of the hot gas continuously introduced into the carbonization chamber is controlled at 350℃±20℃ for an initial temperature increase of 20 days and nights. Next, the temperature of the hot gas continuously introduced into the carbonization chamber is controlled at 520℃±20℃ for a mid-term temperature increase of 23 days and nights. Then, the temperature of the hot gas continuously introduced into the carbonization chamber is controlled at 600-900℃ for a final temperature increase of 14 days and nights. When the oven temperature reaches 900℃, the carbonization chamber can be loaded with coal and coke, and the start-up procedure can begin.

[0026] Compare with Example 1

[0027] The hot gas generated by the burner is continuously introduced into the carbonization chamber through a positive pressure drying oven. The hot gas supply time is controlled for 30 days and nights, and the temperature of the hot gas is 100℃-200℃ to ensure uniform heating of the entire furnace. Then, the hot gas supply time is controlled for 35 days and nights, and the temperature of the hot gas is 300℃-600℃. Then, the hot gas supply time is controlled for 25 days and nights, and the temperature of the hot gas is 600℃-900℃. When the furnace temperature reaches 900℃, the carbonization chamber can be loaded with coal and coke, and the start-up procedure can begin.

[0028] In summary, by gradually increasing the temperature and heating time in Example 1 and Comparative Example 1, the oven baking time is short, and the gradual heating of the coke oven can evaporate most of the moisture in the masonry and quickly discharge it through the chimney, avoiding rapid heating. When the coke oven is heated rapidly, the large amount of water vaporization and expansion can damage the furnace lining. At the same time, it avoids the thermal stress generated by rapid heating that can damage the inside of the coke oven. Therefore, Example 1 is the best embodiment.

[0029] This invention utilizes a positive pressure oven to continuously introduce hot gas generated by the burner into the carbonization chamber. By controlling the hot gas introduction time to 25 days and nights, and maintaining the hot gas temperature at 250℃±30℃, most of the moisture in the masonry can be evaporated and quickly discharged through the chimney, preventing rapid heating of the coke oven. This avoids damage to the oven lining caused by the large-scale vaporization and expansion of moisture during rapid heating. Furthermore, by controlling the hot gas introduction time to 20 days and nights, and maintaining the hot gas temperature at 350℃±20℃, the coke oven temperature is simultaneously controlled... The internal expansion rate is 0.034% ± 0.001%. Then, by controlling the hot gas introduction time to 23 days and nights, and the hot gas temperature to 520℃ ± 20℃, while controlling the expansion rate inside the coke oven to not exceed 0.04%, the hot gas introduction time is controlled to 14 days and nights, and the hot gas temperature to 600-900℃, the coke oven is gradually preheated to avoid thermal stress caused by rapid heating and damage to the coke oven. At the same time, the oven drying time is shortened and the oven drying cost is reduced.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0031] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A positive pressure drying process for coke ovens, characterized in that: The methods and steps include the following: Step 1: Install positive pressure drying oven equipment on one side of the coke oven, connect the gas pipeline to the air inlet pipe of the positive pressure drying oven equipment, connect the gas and air outlets of the positive pressure drying oven equipment to the burner, install the burner in the carbonization chamber, and complete the installation of the drying oven pipeline and equipment; Step 2: Preheating period, control the temperature of the hot air continuously blown into the carbonization chamber by the positive pressure oven equipment at 250℃±30℃, and preheat for 25 days and nights; Step 3: Initial heating, control the temperature of the hot air continuously blown into the carbonization chamber by the positive pressure oven equipment at 350℃±20℃, and start heating for 20 days and nights; Step 4: Mid-term heating, control the temperature of the hot air continuously blown into the carbonization chamber by the positive pressure oven equipment at 520℃±20℃, mid-term heating for 23 days and nights; Step 5: Later stage of heating, control the temperature of the hot air continuously blown into the carbonization chamber by the positive pressure oven equipment to be between 600 and 900℃, and heat up for 14 days and nights.

2. The coke oven positive pressure drying process according to claim 1, characterized in that: In step one, the gas pipeline and the air inlet pipe of the positive pressure oven are sealed and connected by a flange.

3. The coke oven positive pressure drying process according to claim 1, characterized in that: During the preheating period in step two, the temperature is 250℃±30℃, which can evaporate most of the moisture in the masonry and quickly discharge it through the chimney, avoiding rapid heating. When the coke oven heats up rapidly, the large amount of water vaporization and expansion will damage the furnace lining.

4. The coke oven positive pressure drying process according to claim 1, characterized in that: The initial, intermediate, and final heating steps in steps three, four, and five are used to gradually preheat the coke oven, avoiding thermal stress caused by rapid heating that could damage the coke oven.

5. The coke oven positive pressure drying process according to claim 1, characterized in that: In step three, the expansion rate inside the coke oven is 0.034% ± 0.001%.

6. The coke oven positive pressure drying process according to claim 1, characterized in that: In step four, the expansion rate inside the coke oven is 0.04%.

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