CN205245218U - Boiler system - Google Patents

Abstract

The utility model relates to energy conversion equipment, and discloses a boiler system. The boiler system includes a first boiler and a second boiler. There is a second boiler hot primary air main pipe (2), and an adjacent furnace heating main pipe (3) is arranged between the first boiler hot primary air main pipe (1) and the second boiler hot primary air main pipe (2) , the adjacent furnace heating main pipe (3) is provided with a communication control device, so that the first boiler primary hot air main pipe (1) and the second boiler primary hot air main pipe (1) can be selectively connected and cut off through the communication control device. Mother pipe (2). The boiler system of the utility model introduces the hot primary air of the second boiler into the first boiler through the adjacent furnace heating main pipe, which solves the problem of difficulty in igniting and starting the boiler.

Description

a boiler system

technical field

The utility model relates to energy conversion equipment, in particular to a boiler system.

Background technique

When the boiler is in normal operation after startup, the exhausted flue gas flows through the air preheater, and the air preheater heats the primary air and the secondary air. The primary air enters the pulverizing system and carries pulverized coal from the coal mill of the pulverizing system. It flows out and enters the furnace for combustion. The high-temperature flue gas generated by the combustion heats the heating surface in the boiler. After the flue gas is discharged, the residual heat is used to heat the air preheater. This cycle maintains the combustion of the boiler and ensures that the primary air reaches the required temperature. When the boiler starts from a cold state, the air preheater cannot heat the primary air because it has not yet produced hot flue gas. Therefore, an oil-fired boiler is usually installed separately as a start-up boiler for heating, or a heater (heater The steam source heated by the heater is taken from the auxiliary steam header), and the primary air is heated by the heater so that the primary air reaches the predetermined air outlet temperature before ignition is started. In the regional environment with low temperature, the output of the air heater is often insufficient, so that the temperature of the primary air cannot reach the ignition temperature, resulting in the failure to start the ignition smoothly; Need to increase the temperature of the primary air. In addition, when the boiler is started in a cold state, it needs to heat the furnace and the heating surface in the furnace to reduce thermal stress. This heating process is usually heated by the primary air entering the furnace, which consumes a large amount of auxiliary steam.

Therefore, a better technical solution is needed to solve technical problems such as difficult ignition of the boiler during cold start, the need for a larger capacity auxiliary heat source, and the need to consume a large amount of auxiliary steam.

Utility model content

The purpose of the utility model is to provide a boiler system, which can at least partially solve the above technical problems in the startup of the boiler system.

In order to achieve the above object, the utility model provides a boiler system, the boiler system includes a first boiler and a second boiler, the first boiler has a primary hot air main pipe of the first boiler, and the second boiler has a second boiler The hot primary air main pipe, the adjacent furnace heating main pipe is arranged between the first boiler hot primary air main pipe and the second boiler hot primary air main pipe, and the adjacent furnace heating main pipe is provided with a communication control device to be able to The communication control device selectively connects and cuts off the first boiler hot primary air main pipe and the second boiler hot primary air main pipe.

Preferably, the heating main pipe adjacent to the furnace is provided with a first isolation plate valve and a second isolation plate valve, and the first isolation plate valve and the second isolation plate valve can control the heating of the first boiler primary air main pipe. The communication and cut-off between the hot primary air main pipe of the second boiler.

Preferably, the first isolation plate valve and the second isolation plate valve are flap valves or gate valves.

Preferably, the first isolation plate valve and the second isolation plate valve are electric isolation plate valves.

Preferably, the boiler system includes a plurality of coal pulverizers for supplying pulverized coal to the first boiler, the plurality of coal pulverizers at least include coal pulverizers correspondingly provided with igniters, and the first boiler heats The start-up isolation baffle valve is set on the air main pipe, and the start-up isolation baffle valve can be controlled so that the hot air in the heating main pipe of the adjacent furnace is only supplied to the In the coal pulverizer correspondingly provided with the igniter.

Preferably, the coal mills correspondingly provided with the igniter include a first coal mill and a second coal mill.

Preferably, the first boiler also includes a first boiler cold primary air main pipe for providing cold primary air, and the first boiler hot primary air main pipe and the first boiler cold primary air main pipe are respectively provided with Adjust the valve group and connect to the primary air inlet pipe of the coal mill.

Through the above technical scheme, the adjacent furnace heating main pipe is set between the first boiler hot primary air main pipe and the second boiler hot primary air main pipe, and the adjacent furnace heating main pipe is opened when the first boiler starts from the cold state, so that the The hot primary air of the second boiler is introduced into the hot primary air main pipe of the first boiler, and the temperature of the primary air at the outlet of the coal mill of the first boiler is increased through the hot primary air, so as to solve the problems caused by insufficient output of the heater or coal burning. The low volatile content caused the difficulty in starting the boiler; in addition, the hot primary air of the second boiler enters the primary air circulation channel of the first boiler, directly heating the furnace of the first boiler and the heating surface in the furnace, which greatly reduces the Reduce the amount of auxiliary steam when the boiler starts, and reduce the temperature rise rate of the heating surface in the furnace at the initial stage of ignition, thereby reducing the thermal stress on the heating surface.

Other features and advantages of the present utility model will be described in detail in the following specific embodiments.

Description of drawings

The accompanying drawings are used to provide a further understanding of the utility model, and constitute a part of the description, together with the following specific embodiments, are used to explain the utility model, but do not constitute a limitation to the utility model. In the attached picture:

Fig. 1 is a schematic diagram of the connection relationship of the adjacent furnace heating main pipe in the boiler system of the present invention.

Explanation of reference signs

1 Primary hot air main pipe of the first boiler

2 Second boiler hot primary air main pipe

3 Adjacent furnace heating main pipe

4 Primary cold air main pipe of the first boiler

5 first coal mill

6 second coal mill

detailed description

The specific embodiment of the utility model will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the utility model, and are not intended to limit the utility model.

Referring to Fig. 1, the boiler system provided by the utility model includes a first boiler and a second boiler, the first boiler has a first boiler hot primary air main pipe 1, and the second boiler has a second boiler hot primary air A main pipe 2, an adjacent furnace heating main pipe 3 is arranged between the first boiler hot primary air main pipe 1 and the second boiler hot primary air main pipe 2, and the adjacent furnace heating main pipe 3 is provided with a communication control device, The first boiler hot primary air main pipe 1 and the second boiler hot primary air main pipe 2 can be selectively connected and blocked through the communication control device. The hot primary air main pipe 1 of the first boiler is the main pipe for supplying the hot primary air in the first boiler, and the hot primary air main pipe 2 for the second boiler is the main pipe for supplying the hot primary air in the second boiler.

Since an adjacent furnace heating main pipe 3 is arranged between the first boiler hot primary air main pipe 1 and the second boiler hot primary air main pipe 2, when the first boiler is started from a cold state, the adjacent furnace heating main pipe 3 is opened, and the The hot primary air of the second boiler is introduced into the hot primary air main pipe 1 of the first boiler, and the introduced hot primary air enters the pulverizing system of the first boiler, which can improve the primary air at the outlet of the coal mill of the first boiler. Temperature, to solve the problem of difficulty in starting the first boiler due to insufficient output of the air heater or low volatile content of coal-fired; in addition, the introduced hot primary air enters the furnace of the first boiler, and affects the furnace of the first boiler and the furnace The heating surface in the furnace is directly heated, which greatly reduces the auxiliary steam consumption when the boiler is started, and reduces the temperature rise rate of the heating surface in the furnace at the initial stage of ignition, thereby reducing the thermal stress on the heating surface.

It can be understood that in this boiler system, when the second boiler starts from a cold state, the hot primary air in the first boiler can also be introduced from the first boiler hot primary air main pipe 1 through the adjacent furnace heating main pipe 3 To the second boiler hot primary air main pipe 2 of the second boiler to improve the conditions for starting the second boiler.

The communication control device on the adjacent furnace heating main pipe 3 can be implemented in various ways, for example, it can be set as a first isolation plate valve 31 and a second isolation plate valve 32, and the first isolation plate valve 31 and the second isolation plate valve The second isolation plate valve 32 can control the connection and cut-off between the first boiler hot primary air main pipe 1 and the second boiler hot primary air main pipe 2 . When the boiler system is in normal operation or during maintenance, the first isolation plate valve 31 and the second isolation plate valve 32 are closed to prevent the hot primary air from being between the primary hot air main pipe 1 of the first boiler and the primary hot air main pipe 2 of the second boiler Serial operation; before the boiler on one side of the boiler system is ignited and started, the isolation plate valve (the first isolation plate valve 31 or the second isolation plate valve 32) corresponding to the boiler on the running side is opened, and the valve on the control and start-up side The opening of the isolation plate valve corresponding to the boiler controls the flow of the hot primary air passing through the heating main pipe 3 of the adjacent furnace.

The first isolation plate valve 31 and the second isolation plate valve 32 may be flap valves or gate valves; further preferably, the first isolation plate valve 31 and the second isolation plate valve 32 are electric isolation plate valves.

The boiler system includes a plurality of pulverizers for supplying pulverized coal to the first boiler, and at least one of the plurality of pulverizers is provided with a corresponding igniter, and the hot primary air main pipe of the first boiler 1 is provided with a start-up isolation damper valve, which can be controlled so that the hot air in the adjacent furnace heating main pipe 3 is only supplied to the In the coal pulverizer correspondingly provided with the igniter. Through this setting, the hot primary air supplied by the adjacent furnace heating main pipe 3 is only supplied to the coal mill equipped with an igniter, which ensures the temperature of the primary air at the outlet of the coal mill equipped with an igniter, which is beneficial The first boiler is fired. Preferably, the coal mills correspondingly provided with the igniter include a first coal mill 5 and a second coal mill 6 .

The first boiler may also include a first boiler cold primary air main pipe 4 for providing cold primary air, and the first boiler hot primary air main pipe 1 and the first boiler cold primary air main pipe 4 are respectively arranged There is a set of regulating valves and a primary air inlet pipe connected to the coal mill. The cold primary air is primary air whose temperature is lower than that of the hot primary air, usually the primary air that has not been heated by a preheater. By adjusting the cold primary air and hot primary air, the temperature of the primary air entering the coal mill can be better controlled.

The preferred embodiment of the utility model has been described in detail above in conjunction with the accompanying drawings, but the utility model is not limited to the specific details of the above-mentioned embodiment. These simple modifications all belong to the protection scope of the present utility model.

In addition, it should be noted that the various specific technical features described in the above specific implementation manners may be combined in any suitable manner if there is no contradiction. In order to avoid unnecessary repetition, the utility model will not further describe various possible combinations.

In addition, any combination of various implementations of the present invention can also be made, as long as they do not violate the idea of the present invention, they should also be regarded as the disclosed content of the present invention.

Claims (7)

1. A boiler system, characterized in that the boiler system comprises a first boiler and a second boiler, the first boiler has a first boiler hot primary air main pipe (1), and the second boiler has a second boiler The hot primary air main pipe (2), the adjacent furnace heating main pipe (3) is arranged between the first boiler hot primary air main pipe (1) and the second boiler hot primary air main pipe (2), and the adjacent furnace The heating main pipe (3) is provided with a communication control device, so that the first boiler hot primary air main pipe (1) and the second boiler hot primary air main pipe (2) can be selectively connected and cut off through the communication control device. ). 2. The boiler system according to claim 1, characterized in that a first isolation plate valve (31) and a second isolation plate valve (32) are arranged on the adjacent furnace heating main pipe (3), and the first isolation plate valve (32) An isolation plate valve (31) and a second isolation plate valve (32) can control the connection and cut-off between the first boiler hot primary air main pipe (1) and the second boiler hot primary air main pipe (2). 3. The boiler system according to claim 2, characterized in that, the first isolation plate valve (31) and the second isolation plate valve (32) are flap valves or flapper valves. 4. The boiler system according to claim 3, characterized in that, the first isolation plate valve (31) and the second isolation plate valve (32) are electric isolation plate valves. 5. The boiler system according to any one of claims 1 to 4, characterized in that, the boiler system comprises a plurality of coal pulverizers for supplying pulverized coal to the first boiler, among the plurality of coal pulverizers At least including coal mills correspondingly equipped with igniters, the first boiler hot primary air main pipe (1) is provided with a start-up isolation damper valve, and the start-up isolation damper valve can be controlled to make the adjacent furnace heat The hot air in the main pipe (3) is only supplied to the coal mill correspondingly provided with the igniter via a part of the first boiler hot primary air main pipe (1). 6. The boiler system according to claim 5, characterized in that the coal mills correspondingly provided with the igniters include a first coal mill (5) and a second coal mill (6). 7. The boiler system according to claim 5, characterized in that, the first boiler also includes a first boiler cold primary air main pipe (4) for providing cold primary air, and the first boiler hot primary air The main pipe (1) and the cold primary air main pipe (4) of the first boiler are respectively provided with regulating valve groups and connected to the primary air inlet pipe of the coal mill.