CN207035188U - A kind of device and TRT for grinding black fuel - Google Patents

Abstract

The utility model provides a device for grinding black fuel and a power generation device, and relates to the technical field of power generation equipment. The device for grinding black fuel includes a coal economizer and a coal mill; It is connected with the denitrification device, and the economizer is connected with the denitrification device through a flue; the flue is connected with the coal mill, and is used to send the boiler flue gas in the flue into the coal mill. The temperature of the boiler flue gas taken from the flue between the economizer and the denitrification device is about 340°C-370°C, which is much lower than the temperature of the boiler flue gas taken directly from the boiler furnace, because the temperature of the boiler flue gas is low , does not need a lot of cold air and hot air to mix and cool, so the oxygen content of the boiler flue gas in the coal mill is reduced, and the oxygen content of the flue gas can be controlled below the deflagration critical point of 14%, which can basically eliminate the deflagration phenomenon , so that the device for grinding black fuel can grind various types of coal, effectively expanding the scope of application of the device for grinding black fuel.

Description

A device for grinding black fuel and a power generation device

technical field

The utility model relates to the technical field of power generation equipment, in particular to a device for grinding black fuel and a power generation device with the device for grinding black fuel.

Background technique

The fan coal mill is a high-speed coal mill, and its structure is similar to that of a fan. It is composed of a working impeller and a volute-shaped outer cover. The impeller is equipped with 8 to 12 blades, which are called impact plates. The inner wall of the volute is equipped with armor. The outlet of the fan pulverizer is a pulverized coal separator.

In the fan coal mill, the pulverization and drying of coal are carried out at the same time, and they influence each other. The grinding process is affected by both mechanical force and thermal force. The impact of the impeller on the coal particles, the friction between the coal particles and the blade surface, the impact of the moving coal particles and the armor on the volute, and the impact between the coal particles are all mechanical effects; the thermal effect is manifested in the coal particles in the fan coal mill. It is dried by high-temperature medium. As a result of drying, the plasticity of the surface of coal particles is reduced, and it is easy to break, and even some coal particles break up by themselves during the drying process. With impact crushing and bursting, the surface area of coal particles increases, which further deepens the drying process and is more conducive to crushing. Compared with other coal mills, most of the coal particles are in a suspended state in the fan fan mill, and the drying process is very strong. , so it is most suitable for grinding high moisture lignite and bituminous coal.

The traditional fan coal mill usually transports the high-temperature boiler flue gas extracted from the boiler furnace to the pipeline, mixes it with a large amount of cold air and hot air, and finally transports it to the fan coal mill and then to the boiler in the fan coal mill The oxygen content of flue gas is high. When the fan coal mill grinds coals with high water content such as lignite, although the oxygen content of the boiler flue gas is high, the probability of deflagration is low under proper control. However, when the fan coal mill grinds other coals with low water content, the oxygen content of the boiler flue gas is in the critical range of fan coal mill deflagration, and the probability of fan coal mill deflagration increases greatly, which is harmful to the safety of personnel and equipment. It poses a great threat, making it difficult for the fan coal mill to grind various types of coal, resulting in a smaller scope of application.

Utility model content

The purpose of the utility model is to provide a device for grinding black fuel to solve the technical problem that the fan coal mill in the prior art has a small application range.

The device for grinding black fuel provided by the utility model includes a coal economizer and a coal mill;

The two ends of the economizer are respectively used to connect with the boiler and the denitrification device, and the economizer and the denitrification device are connected through a flue;

The flue is connected with the coal mill for sending boiler flue gas in the flue into the coal mill.

Further, the device for grinding black fuel includes a plurality of coal mills.

Further, each of the coal mills is connected to the flue through a main pipe and a branch pipe;

One end of the main pipe is connected to the flue, and the other end is closed;

One end of the branch pipe is connected to the main pipe, and the other end is connected to the coal mill.

Further, an isolation door is provided on the main pipe.

Further, the device for grinding black fuel also includes a blower, and the blower is connected in parallel to both ends of the isolation door on the main pipe through a bypass pipe.

Further, the bypass pipe is provided with two isolation doors, and the two isolation doors are respectively arranged at two ends of the fan.

Further, an adjustment door and an isolation door are sequentially provided on the branch pipe.

Further, the device for grinding black fuel also includes a hot air mechanism and a cold air mechanism;

The hot air mechanism is respectively connected to each branch pipe, and the connection point between the hot air mechanism and the branch pipe is set at the end of the regulating door away from the coal mill, and is used to deliver hot air to the branch pipe;

The cold air mechanism is respectively connected to each branch pipe, and the connection point between the cold air mechanism and the branch pipe is set at the end of the regulating door away from the coal mill, and is used to deliver cold air to the branch pipe.

Further, the device for grinding black fuel also includes a controller, which is used to control the opening and closing of the regulating door, the isolation door, the cold air mechanism and the hot air mechanism.

The purpose of the utility model is also to provide a power generation device, including the device for grinding black fuel described in the utility model.

The device for grinding black fuel provided by the utility model includes a coal economizer and a coal mill; the two ends of the economizer are respectively used to connect with the boiler and the denitration device, and the economizer and the denitration device It is connected through a flue; the flue is connected with the coal mill, and is used to send the boiler flue gas in the flue into the coal mill. The temperature of the boiler flue gas taken from the flue between the economizer and the denitrification device is about 340°C-370°C, which is much lower than the temperature of the boiler flue gas taken directly from the boiler furnace, because the temperature of the boiler flue gas is low , does not need a large amount of cold air and hot air to mix and cool, so the oxygen content of the boiler flue gas in the coal mill is reduced, and the oxygen content of the flue gas can be controlled below the deflagration critical point of 14%, which can basically eliminate the deflagration phenomenon , so that the device for grinding black fuel can grind various types of coal, effectively expanding the scope of application of the device for grinding black fuel.

The power generation device provided by the utility model includes the device for grinding black fuel described in the utility model. When the power generation device provided by the utility model is in operation, when the device for grinding black fuel in the power generation device is grinding coal, the temperature of the boiler flue gas taken out from the flue between the economizer and the denitrification device is between 340°C and 370°C. ℃, which is much lower than the temperature of the boiler flue gas taken directly from the boiler furnace. Since the temperature of the boiler flue gas is low, a large amount of cold air and hot air are not needed for mixing and cooling, thus reducing the temperature of the boiler flue gas in the coal mill. Oxygen content, which can control the oxygen content of the flue gas below the deflagration critical point of 14%, which can basically eliminate the deflagration phenomenon, improve the safety performance of the power generation device, and enable the device for grinding black fuel to grind various types of coal , effectively expand the scope of application of the device for grinding black fuel, and reduce production costs.

Description of drawings

In order to more clearly illustrate the specific implementation of the utility model or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the specific implementation or the prior art will be briefly introduced below. Obviously, the following descriptions The accompanying drawings are some implementations of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without any creative work.

Fig. 1 is a schematic structural diagram of a device for grinding black fuel provided by an embodiment of the present invention.

Icons: 1 - economizer; 2 - denitrification device; 3 - flue; 4 - main pipe; 5 - branch pipe; 6 - bypass pipeline; 7 - coal mill; 8 - fan; Regulating door; 11-cold air mechanism; 12-hot air mechanism.

detailed description

The technical solutions of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the utility model, but not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

In the description of the present utility model, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", " "Outside", etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the referred device or element must have a specific Orientation, construction and operation in a specific orientation, and therefore should not be construed as limiting the utility model. In addition, if the terms "first" and "second" appear, they are used for descriptive purposes only, and should not be understood as indicating or implying relative importance. Wherein, the terms "first position" and "second position" are two different positions.

In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a flexible connection. Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

The utility model provides a device for grinding black fuel and a power generating device, and a plurality of embodiments are given below to describe the device for grinding black fuel and the power generating device provided by the utility model in detail.

Example 1

The device for grinding black fuel provided by this embodiment, as shown in Figure 1, includes a coal economizer 1 and a coal mill 7; the two ends of the economizer 1 are respectively used to connect with the boiler and the denitrification device 2, and the coal economizer The device 1 and the denitrification device 2 are connected through a flue 3;

The temperature of the boiler flue gas taken from the flue 3 between the economizer 1 and the denitrification device 2 is about 340°C-370°C, which is much lower than the temperature of the boiler flue gas taken directly from the boiler furnace. The temperature of the boiler flue gas taken out from the flue 3 between the device 1 and the denitrification device 2 is relatively low, so a large amount of cold air and hot air are not needed to mix and cool the boiler flue gas, thereby reducing the boiler flue gas in the coal mill 7 The oxygen content of the gas can control the oxygen content of the boiler flue gas below the deflagration critical point of 14%, which can basically eliminate the deflagration phenomenon, so that the device for grinding black fuel can grind various types of coal, and effectively expand the grinding The scope of application of the device for black fuel improves the utilization rate of the device for grinding black fuel.

Specifically, the device for grinding black fuel includes a plurality of coal mills 7 . A plurality of coal mills 7 can work at the same time to improve work efficiency.

Among them, each coal mill 7 is connected to the flue 3 through the main pipe 4 and the branch pipe 5; one end of the main pipe 4 is connected to the flue 3, and the other end is closed; one end of the branch pipe 5 is connected to the main pipe 4, and the other end is connected to the coal mill 7 connect. The boiler flue gas flows into a plurality of branch pipes 5 respectively through the main pipe 4 , and then flows into corresponding coal mills 7 respectively from the plurality of branch pipes 5 .

Wherein, the main pipe 4 is provided with an isolation door 9, which can adjust the amount of boiler flue gas entering the main pipe 4, thereby facilitating regulation and control of the amount of boiler flue gas entering the coal mill 7.

The branch pipe 5 is provided with an adjustment door 10 and an isolation door 9 in sequence, which can adjust the amount of smoke entering the branch pipe 5 .

Under the action of the adjustment door 10 and the isolation door 9 on the main pipe 4 and the branch pipe 5, the amount of boiler flue gas entering the coal mill 7 can be adjusted, which is convenient for controlling the oxygen content and problems of the boiler flue gas, and effectively improves the efficiency of use. reliability and convenience.

Further, the device for grinding black fuel also includes a hot air mechanism 12 and a cold air mechanism 11; the hot air mechanism 12 is respectively connected to each branch pipe 5, and the connection point between the hot air mechanism 12 and the branch pipe 5 is set at the adjustment door 10 away from the coal mill 7 One end is used to deliver hot air to the branch pipe 5; the cold air mechanism 11 is connected to each branch pipe 5 respectively, and the connection point between the cold air mechanism 11 and the branch pipe 5 is set at the end of the regulating door 10 away from the coal mill 7, which is used to send hot air to the branch pipe 5 Delivers cool air.

The boiler flue gas taken from the flue 3 between the economizer 1 and the denitrification device 2 flows into the branch pipe 5 through the main pipe 4, and the hot air delivered by the hot air mechanism 12 and the cold air delivered by the cold air mechanism 11 pass through the regulating door 10 and the isolation door. 9 before mixing with the boiler flue gas, and the mixed boiler flue gas enters the coal mill 7 after being regulated by the regulating door 10 and the isolation door 9 once.

The temperature of the boiler flue gas taken from the flue 3 between the economizer 1 and the denitrification device 2 is about 340-370°C, which is much lower than the temperature of the boiler flue gas taken directly from the boiler furnace. The temperature is relatively low, and there is no need for a large amount of cold air and hot air to mix and cool, so the oxygen content of the boiler flue gas in the coal mill 7 is reduced, and under the adjustment of the isolation door 9 and the adjustment door 10, it can be better By controlling the amount of boiler flue gas entering the coal mill 7, the oxygen content of the flue gas can be controlled below the deflagration critical point of 14%, which can basically prevent deflagration.

Further, the device for grinding black fuel also includes a fan 8, which is connected in parallel to both ends of the isolation door 9 on the main pipe 4 through a bypass pipe. Two isolation doors 9 are arranged on the bypass pipe, and the two isolation doors 9 are respectively arranged at both ends of the fan 8 .

Among them, the fan 8 can pressurize the boiler flue gas, and the boiler flue gas flowing out from the flue 3 between the economizer 1 and the denitrification device 2, when the two isolation doors 9 on the bypass pipeline 6 are opened, It is divided into two paths, one flows into the main pipe 4, and the other flows into the bypass pipe 6. The boiler flue gas in the bypass pipe 6 is pressurized by the fan 8, and then flows into the main pipe 4, which can expand the flow into the coal mill. 7. The adjustment range of boiler flue gas temperature and oxygen content enhances convenience.

The two isolation doors 9 on the bypass pipeline 6 can control whether the boiler flue gas flows into the bypass pipeline 6, and can be selected according to the needs of use. When the two isolation doors 9 are opened, the boiler flue gas will flow into the bypass pipeline 6 , the boiler flue gas will not flow into the bypass pipe 6 when the two isolation doors 9 are closed.

Furthermore, the device for grinding black fuel further includes a controller, which is used to control the opening and closing of the regulating door 10 , the isolation door 9 , the cold air mechanism 11 and the hot air mechanism 12 . The temperature, oxygen content and flow rate of the boiler flue gas flowing into the coal mill 7 can be controlled by the controller, and the device for grinding black fuel can be conveniently controlled to improve convenience.

The device for grinding black fuel provided in this embodiment includes a coal economizer 1 and a coal mill 7; It is connected with the denitrification device 2 through a flue 3; the flue 3 is connected with the coal mill 7, and is used to send the boiler flue gas in the flue 3 into the coal mill 7. The temperature of the boiler flue gas taken from the flue 3 between the economizer 1 and the denitrification device 2 is about 340°C-370°C, which is much lower than the temperature of the boiler flue gas taken directly from the boiler furnace. The temperature of the gas is relatively low, and there is no need for a large amount of cold air and hot air to mix and cool, so the oxygen content of the boiler flue gas in the coal mill 7 is reduced, and the oxygen content of the flue gas can be controlled below the deflagration critical point of 14%. , can basically put an end to the deflagration phenomenon, so that the device for grinding black fuel can grind various types of coal, effectively expanding the scope of application of the device for grinding black fuel.

Example 2

The power generation device provided in this embodiment includes the device for pulverizing black fuel described in Embodiment 1.

When the power generation device provided by this embodiment is in operation, a device for grinding black fuel is required to break coal lumps and grind them into coal powder.

Among them, the device for grinding black fuel includes an economizer 1 and a coal mill 7; the two ends of the economizer 1 are respectively used to connect with the boiler and the denitrification device 2, and the economizer 1 and the denitrification device 2 pass through the flue 3 Connection; the flue 3 is connected with the coal mill 7 for sending the boiler flue gas in the flue 3 into the coal mill 7.

The temperature of the boiler flue gas taken from the flue 3 between the economizer 1 and the denitrification device 2 is about 340°C-370°C, which is much lower than the temperature of the boiler flue gas taken directly from the boiler furnace. The temperature of the boiler flue gas taken out from the flue 3 between the device 1 and the denitrification device 2 is relatively low, so a large amount of cold air and hot air are not needed to mix and cool the boiler flue gas, thereby reducing the boiler flue gas in the coal mill 7 The oxygen content of the gas can control the oxygen content of the boiler flue gas below the deflagration critical point of 14%, which can basically eliminate the deflagration phenomenon, so that the device for grinding black fuel can grind various types of coal, and effectively expand the grinding The scope of application of the device for black fuel improves the utilization rate of the device for grinding black fuel.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand : It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements to some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the various embodiments of the present invention Scope of technical solutions.

Claims (10)

1. A device for grinding black fuel, comprising an economizer and a coal mill; The two ends of the economizer are respectively used to connect with the boiler and the denitrification device, and the economizer and the denitrification device are connected through a flue; The flue is connected with the coal mill for sending boiler flue gas in the flue into the coal mill. 2. The device for grinding black fuel according to claim 1, characterized in that, the device for grinding black fuel comprises a plurality of coal mills. 3. The device for grinding black fuel according to claim 2, characterized in that, each said coal mill is connected with said flue through a main pipe and a branch pipe; One end of the main pipe is connected to the flue, and the other end is closed; One end of the branch pipe is connected to the main pipe, and the other end is connected to the coal mill. 4. The device for grinding black fuel according to claim 3, characterized in that an isolation door is provided on the main pipe. 5. The device for grinding black fuel according to claim 4, characterized in that, the device for grinding black fuel further comprises a blower, and the blower is connected in parallel to both ends of the isolation door on the main pipe through a bypass pipe. 6 . The device for grinding black fuel according to claim 5 , wherein two isolation doors are arranged on the bypass pipe, and the two isolation doors are respectively arranged at two ends of the fan. 7 . 7. The device for grinding black fuel according to any one of claims 3-6, characterized in that, the branch pipe is provided with an adjustment door and an isolation door in sequence. 8. The device for grinding black fuel according to claim 7, characterized in that, the device for grinding black fuel also includes a hot air mechanism and a cold air mechanism; The hot air mechanism is respectively connected to each branch pipe, and the connection point between the hot air mechanism and the branch pipe is set at the end of the regulating door away from the coal mill, and is used to deliver hot air to the branch pipe; The cold air mechanism is respectively connected to each branch pipe, and the connection point between the cold air mechanism and the branch pipe is set at the end of the regulating door away from the coal mill, and is used to deliver cold air to the branch pipe. 9. The device for grinding black fuel according to claim 8, characterized in that, the device for grinding black fuel also includes a controller, and the controller is used to control the regulating door, the isolation door, the cold air mechanism and the hot air mechanism open and close. 10. A power generation device, characterized by comprising the device for grinding black fuel according to any one of claims 1-9.