JPH0576518B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for producing coal water slurry.

[Conventional technology]

In general, there are types of coal that are easy to crush and those that are difficult to crush, and those that have low or high volatile components. Depending on the type of coal, the wet pulverization method and time are adjusted for each type of coal, and then different types of coal are mixed together, or different types of coal are mixed and then wet pulverized at the same time. A method of crushing was used.

[Problem to be solved by the invention] However, in the former case, it is necessary to install separate crushers for different types of coal, and also to install a mixer to mix different types of crushed coal. , the disadvantage is that the equipment cost is high, and in the latter case,
For example, types of coal that are easy to crush or coal that can have large particles due to its high volatile content may be unnecessarily pulverized, resulting in high operating costs.

An object of the present invention is to enable pulverization suitable for the pulverization characteristics and combustibility of raw coal.

[Means for solving problems]

The characteristic structure of the coal water slurry manufacturing method of the present invention is as follows:
The first raw material coal is finely pulverized by a first pulverizer, and the
A second raw material coal that is different from the raw material coal and requires a shorter grinding time than the first raw material coal, and the first raw material coal processed in the first pulverizer are mixed and wet-pulverized in a second pulverizer. In particular, its functions and effects are as follows.

[Effect]

In other words, a type of coal that is difficult to crush or a coal that must be finely crushed because it has few volatile components that are advantageous for combustion is used as the first raw material coal, and
If you use a type of coal that is easy to crush as the second raw material coal, or a coal whose particles may be somewhat large because it has a lot of volatile components that are advantageous for combustion, the second raw material coal can be used as the second raw material coal.
Compared to wet pulverization using only a pulverizer,
After the raw coal is finely pulverized in the first pulverizer, it is further pulverized in the second pulverizer.
In order to be finely wet-pulverized by a crusher, first,
By appropriately adjusting the second pulverizer, it is possible to carry out the pulverization process that is optimal for the pulverizing characteristics and combustibility of various types of raw coal without applying unnecessary power.
Since the pulverizer is also used as a mixer for mixing the first raw material coal and the second raw material coal, the first and second raw material coals are pulverized by separate pulverizers and then put into the mixer. Therefore, compared to mixing, power and equipment can be reduced.

〔Effect of the invention〕

Therefore, equipment costs and operating costs can be reduced, and coal water slurry of stable quality can be supplied over a long period of time.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

First raw material coal A consisting of coal that is difficult to crush or coal that is difficult to burn unless it is finely crushed due to its low volatile content is fed into a first wet crusher 1 and crushed by adding water and additives, The first raw material coal A that has been pulverized by the first pulverizer 1 is further fed into a second wet pulverizer 2 . At the same time, the mixing ratio of the second raw material coal B, which is made of coal that is easy to crush or coal that contains a large amount of volatile matter and therefore burns effectively even if the particles are somewhat large, to the first raw material coal A is kept constant. Then, it is charged into the second crusher 2.

In the second crusher 2, the first raw material coal A and the second
Raw material coal B is mixed at a constant ratio and wet-pulverized while simultaneously adding water and additives, and different types of coal raw materials are mixed to produce a highly concentrated coal-water slurry with stable quality.

In addition, the processing conditions by the second crusher 2 are set so that the second raw material coal B is crushed in an optimal state,
The processing conditions by the first crusher 1 are the first raw material coal A
is set so that it is pulverized under optimal conditions through processing by both the first pulverizer 1 and the second pulverizer 2.

[Another example]

The first pulverizer 1 may be of a dry type instead of a wet type, and in this case, it is not necessary to add water and additives to the first pulverizer 1.

In the case of wet pulverization using the first pulverizer 1, depending on how the amounts of water and additives added in the first pulverizer 1 are adjusted, it is not necessary to add water and additives in the second pulverizer 2.

[Brief explanation of the drawing]

The drawing is a block diagram showing an embodiment of the method for producing coal-water slurry according to the present invention. 1...First crusher, 2...Second crusher, A...
First raw material coal, B... second raw material coal.

Claims (1)

[Claims] 1 Finely pulverize the first raw material coal A with the first pulverizer 1,
a second raw material coal B that is different from the first raw material coal A and requires a shorter grinding time than the first raw material coal A;
The first raw material coal A treated with the first crusher 1,
A method for producing coal water slurry in which mixing is performed in a second pulverizer 2 and wet pulverization is performed.