JPS60114621A - Uniform distributing device of fine powdered coal in fine powdered coal burning boiler - Google Patents

Abstract

PURPOSE:To obtain the fine powdered coal burning boiler which is enabled to distribute uniformly the fine powdered coal and provided with a high practical performance by a method wherein a square and bent flow leaning pipe having a specific angle is installed to lean a flow direction of the fine powdered coal on the air transferring way by the inertia force and the centrifugal force. CONSTITUTION:A solid and gas combined two phases flow is formed of a fine powdered coal in a fine powdered coal pipe 2 at the outlet of a coal grinder 1 and an air flow. The solid and gas combined two phases flow is an irregular flow such as a rotating flow and the like, accordingly, the flow is changed to a direct wellregulated flow with a regulator 3. The fine powdered coal pipe 2 is normally circular shape, a square pipe 4 is connected to the pipe 2. Thereafter, a solid and gas combined two phases flow is leaned with a flow leaning pipe 5 having a suitable angle 30-90 deg.. The weight of the fine powdered coal in the solid and gas combined two phases flow is heavier than that of the air, consequently, said two phases flow is leaned toward the outer surface of the flow leaning pipe 5, then distributed with a distributor 6 where the fine powdered coal is changed to the uniform leaning flow.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a so-called pulverized coal distributing device that uniformly distributes a 61 m pulverized coal burner in a pulverized coal-fired boiler. The essential importance of evenly distributing pulverized coal to the valley-shaped VJ coal burner of the boiler is as described above.

(1) Recent reduction in nitrogen oxide (NOX) emissions, NOX
Reducing emissions storms is a national issue and an environmental concern.
As for his face, it is one of those of the late Shinji Oshima. The increase in N (JX emissions) from pulverized coal-fired boilers is due to the fact that IPm has many factors related to poor pulverized coal distribution.
The distribution system is a pulverized coal-fired boiler, which is required to have a low resistance to N<)X.

(2) If pulverized coal is distributed unevenly in the boiler efficiency, the fuel ratio in the valley burner of the boiler will be disturbed, resulting in a burner with nitrous combustion and '2I! This causes a burner with insufficient combustion, resulting in low boiler efficiency. In addition, due to the disturbance of Botan Hikyi, the number of starting points of the original tast increases, so the number of side trips with boiler-chive of this tast increases, and this song also causes a decrease in boiler efficiency. The pulverized coal leveling and distribution equipment is essential equipment from the standpoint of boiler efficiency as well.

(3) The service life of the boiler chive and parts around the burner is shortened due to the lifting platform where the pulverized coal is distributed unevenly, and the air-fuel ratio being disturbed as described in (2) above. Produces low. As a result, the service life of the boiler tube in the pot heating section and parts around the burner is reduced. Kernel is used to distribute pulverized coal evenly and achieve uniform combustion.

(4) Same as above for 11 fires in the boiler. An ash equalization and distribution device is a necessary piece of equipment in order to extend the service life of a large-scale plant.

As described above, uniformly distributing pulverized coal to each burner of the boiler is A1! It can be seen from the blood of Kyoto music, 1st grade Nerky music, and equipment maintenance that he is a JK Higashi Jin. Note that the uniform distribution η here refers to not only the uniform distribution of mussels, but also the uniform distribution of mussels.
It also includes the meaning of uniform distribution of particle size.

The pulverized coal is pulverized by a coal pulverizer (milf) until it is pulverized to 80% or more, and then sent by air to each burner of the boiler for pulverized coal combustion.The pulverized coal is It is distributed to M2 to 4 burners per distributor.In addition, it may be necessary to increase/decrease the boiler load, or at the time of MTo or stoppage.Coal crusher (from Milno to Up to each burner, air is fed through the fine powder chamber at a flow rate of 3aI?g80 to 49 m/a.

As mentioned above, the present invention aims to provide a device for evenly distributing pulverized coal in a pulverized coal-fired boiler, which has practical value and uses the uniform distribution of pulverized coal, which is a hidden and important issue in a pulverized coal burner, as a bait. It is.

The principle of uniform distribution of pulverized coal according to the present invention is as follows: The inertia of pulverized coal (1
nerLia) and centrifugal force to divert the pulverized coal to the external flow inside the f& pulverized coal pipe, and then uniformly distribute it using a distributor having the required number of partition plates. Below) Examples will be explained based on introversion.

As shown in gi4117, the solid-gas two-phase flow of pulverized coal and air in the coal crusher (mill) (υ outlet pulverizer (2) is IP rectified, such as simultaneous commutation, so the rectifier (3) It is rectified and made into a biliary flow.Also, since 2J is a circular shape suitable for cooling, a west angle pipe (4) is installed to make it a square flow.After this, 8
A deflection tube (5) having an appropriate angle of 06 to 90 degrees is provided to deflect the solid-gas two-phase flow. Pulverized coal in a two-phase internal air flow has a specific storm ratio of 2.0 to 2.8, which is lower than that of solid air, so the inertia force (1nertia) and the swallowing force cause drifting - (5
) The flow is biased towards the outer surface of the area. When the pulverized coal becomes uniformly distributed, it is distributed by a distributor (6). The flow of pulverized coal and desired air is shown as the fourth factor. The distributor is Tsutomi 2 to 4, but Hori 2 Kyo shows the distributor for 8 distributions. The eighth factor shows the cross section of the distribution pipe at line 171. Cut damper (7
) , L8J , (September 2019), but due to boiler negative changes kJJ, etc., there is a platform where one or two of the upper Hd cut dampers are opened, but even in this case, the distribution efficiency is Must be in good condition.

Next, test data on the distribution efficiency of the pulverized coal distribution device according to the present invention in the case of 8 distributions will be shown.

(1) Distribution efficiency of 8 distribution (canto tamp < 7), (
8)・(9) Total one-(2) Distribution efficiency of two distributions (Cut tamper (7) pasted, Cut tamper (8), (9) Full open excess distribution rate refers to the case of completely equal distribution. Let it be ioo%.

Also, test data on pressure drop of the pulverized coal distribution device according to the present invention is shown below.

(3) Pressure loss of 8 distribution (cut tamper (7), (
8), (9 small total (4) Pressure loss of 2 distribution (cut tamper < 711 & j, cut or more green) The uniform distribution device of the pulverized coal according to the present invention has the following results when compared with the conventional distribution plate. It has a strong effect.

(1) For example, the Venturi-type dispensing device of Jubai requires more than 10 times as much Namikaka-eibu as the Reichu Tan Umunushi, but the Yuryu Fu-type dispensing device of the present invention requires ui*capital. Since it is y7, the + is doubled in the construction.

(2) Since the distribution device based on the misexplosion 1 has a quantity rate of 1#, the specific force loss is small at 1/2 to 1/jl compared to the conventional type. Therefore, only a small amount of force is required for transporting the pulverized coal, so large air blowing equipment is not required.

(3) Distribution efficiency is 40-80% for the rice-based type.
In comparison, the molecule 16T of the dispensing device according to the invention is
H-tei can maintain an efficiency of 90%.

[Brief explanation of the drawing]

Fig. 1 is an illustration showing an example of the uniform distribution device for pulverized coal in a pulverized coal boiler of the present invention, Fig. 2 is a perspective view showing the discharge of the distributor of the same embodiment, and Fig. 1-1m
10 and 4 are cross-sectional views showing the flow of pulverized coal and air in this example (71). (υ: Surface crusher - (milk (2): Fine powder R (3): Mm (4): Circumference w (5): Partial m (bJ: Distributor <7), (8), Season: Cut Tampa Figure 1 Figure 2 Figure 1 1 Figure 3 Figure 4

Claims (1)

[Claims] 1) In a pulverized coal-fired boiler, pulverized coal is transported to the burner of the boiler. 1) 80-90 throughout the island
A rectangular bend-shaped sludge with an arbitrary angle of ° is installed to deflect the pulverized coal during nitrogen transport by inertial force and centrifugal force.
- Fine powder pA whose purpose is to distribute the biased pulverized coal according to the number of gradients using a distributor connected to the U side of the flow distribution officer.
The first uniform distribution device in the firing hoboi.