JPH0493512A - Dried pulverized coal manufacturing device - Google Patents

Abstract

PURPOSE:To supply stably fuel to be used and reduce the fuel cost by providing a line which transports pneumatically part of the dried pulverized coal in a dried pulverized coal storage section to the burner in a drying gas temperature raising section. CONSTITUTION:Part of the dried pulverized coal in a pulverized coal storage section 4 is drawn out and a line L is provided through which the part of the pulverized coal can be pneumatically transported to the burner 5 in a drying gas temperature raising section l as powdered fuel. The dried pulverized coal that is obtained in a pulverized coal manufacturing device is supplied self-sufficiently as a fuel to raise the temperature of the gas for drying the pulverized coal. It becomes possible to supply stably and at a low cost the fuel for raising gas temperature by adjusting the manufacturing quantity of the dried pulverized coal by taking in consideration the quantity of the pulverized coal that is consumed as fuel for raising the gas temperature. Furthermore, since the pulverized coal is dried to a high degree in the pulverized coal manufacturing device, it is possible to transport pneumatically the pulverized coal to the burner 5 very smoothly and there is no problem of clogging in the line L, joint sections, etc.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to equipment for producing dried pulverized coal, which is used, for example, as fuel for blowing into a blast furnace. Regarding a dry pulverized coal manufacturing facility that uses the dry pulverized coal in the manufacturing facility as the fuel used in the hot section and establishes it as a self-sufficient system, making it possible to reduce the cost and stably supply fuel for gas escalation and mixing. It is something.

[Conventional technology] Dry pulverized coal fuel is used in blast furnaces, direct steel manufacturing equipment, etc., but as a manufacturing equipment for such dry pulverized coal,
Equipment as schematically shown in the figure is commonly used.

In Fig. 2, 1 is a pulverized coal drying gas heating section, 2 is a carbon material crushing/drying section, 3 is a dry pulverized coal collection section such as a bag filter, 4 is a dry pulverized coal storage section, and 5 is a combustion section. 6 indicates a pilot burner, and 7 indicates a blower. In other words, when pulverized coal is used as a fuel for blowing into blast furnaces, it is necessary to improve not only its combustibility but also its blocking resistance during storage, quantitative discharge performance during metered discharge, airflow conveyance, etc. during the manufacturing process. It is necessary to dry it sufficiently to reduce the moisture content. Therefore, the pulverized coal drying gas heating section 1 is installed in the pulverizing section of the carbon material.
A method is adopted in which drying hot air is sent from the charcoal material to crush and dry the charcoal material. The dried pulverized coal is sent together with the drying gas to a dry pulverized coal collection unit 3 such as a bag filter, where the dried pulverized coal is separated and collected, and the drying gas is discharged from the blower 7. The dried pulverized coal is sent to the dry pulverized coal storage section 4, and sequentially sent to the dry pulverized coal demand facility A from the bottom thereof.

In such pulverized coal production equipment, the fuel used in the pulverized coal drying gas heating section 1 has traditionally been mainly coke oven gas (COG), blast furnace gas (BFG), liquefied natural gas (LPG), etc. Gaseous fuel is used.

[B that the invention tries to solve! ! ] However, recently, the amount of various gaseous fuels used in various related equipment attached to blast furnace equipment has been increasing in order to improve productivity and production efficiency. It is becoming difficult to maintain a stable supply of blast furnace gas, etc. Therefore, in the event of a shortage, it may be necessary to replenish commercially available gaseous fuel or rely entirely on commercially available gaseous fuel, and the increased burden on fuel costs cannot be underestimated.

The present invention was made with attention to such a situation, and its purpose is to enable a stable supply of fuel used to raise the temperature of drying gas during the production of pulverized coal, and to reduce fuel costs. The purpose of the present invention is to provide an industrially advantageous pulverized coal production facility that can reduce the amount of pulverized coal.

[Means for Solving the Problems] The dry pulverized coal manufacturing equipment according to the present invention that can solve the above problems has a configuration including a pulverized coal drying gas heating section, a carbon material crushing/drying section, and a dryer pulverized coal. The gist is that the dry pulverized coal storage section is provided with a collection section, a dry pulverized coal storage section, and a line for airflow conveying a part of the dry pulverized coal in the dry pulverized coal storage section to the combustion burner in the drying gas temperature raising section. It is something.

[Operations and Examples] Hereinafter, the configuration and effects of the present invention will be described in detail with reference to drawings showing specific examples.

Figure 1 is a schematic flow diagram showing an embodiment of the present invention, and the series of steps from pulverizing and drying carbonaceous material to collecting and storing dry pulverized coal are the same as the example shown in Figure 2 described above. It is. However, the specific configurations of the crushing/drying section 2, dryer pulverized coal collecting section 3, drying pulverized coal storage section 4, etc. are of course not limited to those shown in the example shown, and the point is that the pulverizing, drying, and capturing of carbon materials Any configuration can be adopted as long as it has the functions of collection and storage. The present invention is different from the conventional example shown in Fig.'s2, and is adopted as its characteristic configuration by extracting a part of the dried pulverized coal from the pulverized coal storage section 4 and passing it through the line L for drying. Combustion burner 5 of gas heating section 1
It is constructed so that it can be transported by airflow as a powdered fuel. That is, the present invention is self-sufficient in dry pulverized coal obtained within the pulverized coal production facility as a gas heating fuel for drying pulverized coal, and the pulverized coal consumed as a gas heating fuel is self-sufficient. By adjusting the production amount of dry pulverized coal in consideration of the amount, it becomes possible to supply fuel for gas temperature rise at low cost and stably. Moreover, since the pulverized coal is kept in a highly dry state in the production equipment, it can be transported by air to the combustion burner 5 extremely smoothly, and there is no risk of clogging in the line L or connecting parts. do not have.

Note that no special means is required for airflow conveying the pulverized coal from the storage ff1S4 to the combustion burner 5, and conventionally known powder airflow conveyance means may be adopted, but A preferred method is to use exhaust gas from which moisture has been removed from dried exhaust gas extracted from the blower 7.

That is, since this exhaust gas is a combusted non-flammable gas, if water is removed from this gas and used as a carrier gas, it can be safely transported without causing flashback or the like within the line. Also, is there no use of pulverized coal, which is used as fuel for heating gas? ! There are no restrictions on the location of the soil, and pulverized coal for gas heating can be extracted by setting up a dedicated extraction section in the storage section, or by installing a distributor in the middle of the extraction line in six directions from the pulverized coal demand equipment. , any method can be adopted. At this time, the pulverized coal quantity dispensing section is equipped with an automatic metering/discharging ratio mechanism, and the required amount of pulverized powder is adjusted according to the temperature and feeding rate required for the hot air sent to the coal material crushing/drying section 2. It is also very effective to be able to automatically weigh and extract the charcoal.

Furthermore, in the present invention, all of the fuel for heating the gas can be self-sufficient from the dry pulverized coal described above; however, if excess flammable gas (blast furnace gas, hot blast furnace gas, etc.) is generated in related equipment, It is also possible to use pulverized coal in combination with pulverized coal, and such modifications are of course included within the technical scope of the present invention.

[Effects of the Invention] The present invention is constructed as described above, and is a self-sufficient system in which dry pulverized coal obtained in a dry pulverized coal production facility is used as a fuel for heating gas for drying pulverized coal. This enables a stable supply of fuel and reduces fuel costs.Furthermore, by adopting the pneumatic conveyance method, it is also possible to automate the extraction and conveyance of pulverized coal, resulting in high efficiency. We are now able to provide dry pulverized coal manufacturing equipment.

[Brief explanation of the drawing]

FIG. 1 is a schematic flow diagram showing an embodiment of the present invention, and FIG. 2 is a schematic flow diagram showing a conventional dry pulverized coal production facility. 1... Pulverized coal drying gas heating section 2... Carbon material crushing/drying section 3... Dry pulverized coal collection section 4... Dry pulverized coal storage section 5... Combustion burner 6...・Pilot burner A...Dry pulverized coal demand equipment

Claims (1)

[Claims] It is equipped with a pulverized coal drying gas heating section, a carbon material crushing/drying section, a dry pulverized coal collection section, and a dry pulverized coal storage section, and a part of the dry pulverized coal in the dry pulverized coal storage section is transferred to the drying gas. Dry pulverized coal production equipment characterized by being equipped with a line for airflow conveyance to a combustion burner in a temperature raising section.