CN217685108U - Biomass blending combustion system - Google Patents

Abstract

The utility model relates to a biomass blending combustion system, which comprises a fan and a biomass burner. The biomass burner is installed on a boiler, and a steam heater is respectively connected with the fan and a steam turbine for heating air; a crushing device is connected to the steam heater. connected to crush and heat the shaped biomass fuel; the first storage device is connected to the crushing device to store the on-site biomass powder prepared by the crushing device; the first feeding device is respectively connected to the steam heater and the biomass burner, It is used to transport the on-site biomass powder in the first storage device to the biomass burner; the second storage device is used to store the finished biomass powder; the second feeding device is respectively connected with the second storage device and the biomass burner The connection is used to transport the finished biomass powder in the second storage device to the biomass burner. The device uses the extraction steam of the steam turbine to heat the air, and then heats the biomass powder through the hot air, which is not prone to corrosion.

Description

A biomass blending system

technical field

The utility model relates to a power generation combustion system, in particular to a biomass mixed combustion system.

Background technique

Coal power plays a dominant role in China's power structure. Biomass co-combustion power generation is an effective measure to optimize the allocation of energy resources and reduce _CO2 emissions by a large margin under the current conditions.

Coal-fired boiler biomass coupled power generation mainly has three technical routes: direct coupling (mixed combustion), gasification coupling and parallel coupling. Biomass direct combustion coupling (mixed combustion) is to transport the pretreated biomass and coal powder to the boiler for direct mixed combustion; indirect coupling refers to the biomass gas produced by biomass gasification is transported to the boiler and mixed with coal powder Combustion; Parallel coupling means that a completely independent biomass boiler is specially configured next to the coal-fired boiler room to generate steam, and the steam generated by the biomass boiler and the steam generated by the coal-fired boiler are mixed and then entered into a common steam turbine for power generation. For coal-fired units with a single unit capacity of not less than 300MW, the most important coupling power generation method in the future will be direct combustion coupling (mixed combustion).

At present, most direct co-firing (coupling) systems tend to use the flue gas at the tail of the boiler to heat the air in the crushing system. Since the flue gas itself has a corrosive effect, it will strongly corrode the crushing system.

Utility model content

In order to solve the above problems, the utility model provides a biomass blending combustion system that has little impact on the crushing system and does not cause corrosion. The specific technical solution is:

A biomass blending combustion system, including a fan and a biomass burner, the biomass burner is installed on the boiler, and also includes: a steam heater, the steam heater is connected to the fan and the steam turbine respectively, for heating air; crushing device, the crushing device is connected with the steam heater, used for crushing and heating the molded biomass fuel; a first storage device, the first storage device is connected with the crushing device, used for Store the on-site biomass powder prepared by the crushing device; the first feeding device, the first feeding device is respectively connected with the steam heater and the biomass burner, and is used to feed the biomass in the first storage device The on-site biomass powder is transported to the biomass burner; the second storage device is used to store the finished biomass powder; and the second feeding device is connected to the second feeding device respectively. The second storage device is connected to the biomass burner, and is used to transport the finished biomass powder in the second storage device to the biomass burner.

Preferably, a hydrophobic recoverer is also included, and the hydrophobic recoverer is connected with the steam heater.

Preferably, the crushing device includes: a conveyor, the conveyor is used for conveying molded biomass fuel; and a crusher, the crusher is connected with the conveyor and the steam heater respectively, and is used for crushing the The molded biomass fuel is crushed into on-site biomass powder, and the on-site biomass powder is heated.

Preferably, the first storage device includes: a cyclone separator connected to the crushing device; a bag filter connected to the cyclone separator; a first unloader , the first unloading machine is connected with the cyclone separator; the first silo, the first silo is connected with the first unloading machine; and the second unloading machine, the second unloading machine The machine is respectively connected with the bag filter and the first silo.

Further, the first feeding device includes: a third unloading machine, the third unloading machine is connected to the first silo; a first feeding pipe, the first feeding pipe is respectively connected to the biomass The burner, the third unloader and the steam heater are connected; and a seventh valve, the seventh valve is installed on the first feeding pipe.

Wherein, it also includes: a secondary air nozzle, the secondary air nozzle is fixed on the boiler, and the secondary air nozzle is also connected with the bag filter.

Preferably, the second storage device includes: a second silo for storing finished biomass powder.

Further, the second feeding device includes: a fourth unloading machine, the fourth unloading machine is connected to the second silo; and a second feeding pipe, the second feeding pipe is respectively connected to the first Four unloaders, the steam heater and the biomass burner are connected.

Preferably, the heating temperature of the steam heater is 100-150°C, and the particle size of the on-site biomass powder is 5mm-10mm.

Preferably, it also includes a pulverized coal pipe, and the pulverized coal pipe is respectively connected with the pulverized coal feeding device and the biomass burner.

Compared with the prior art, the utility model has the following beneficial effects:

A biomass blending system provided by the utility model heats the air to a certain temperature through a steam heater, and then sends the hot air to the crushing device, the first feeding device and the second feeding device to heat the biomass powder, and heat The air has no corrosive effect, and can keep the biomass powder entering the biomass burner at a certain temperature to enter, and corrosion is not easy to occur, and the margin of the steam turbine can be fully utilized, and the overall system is safe and reliable.

Description of drawings

Figure 1 is a structural block diagram of a biomass blending combustion system.

Detailed ways

Now in conjunction with accompanying drawing, the utility model is further described.

As shown in Figure 1, a biomass blending combustion system includes a fan 1, a biomass burner 16, a steam heater 2, a crushing device, a first storage device, a first feeding device, a second storage device, and a second storage device. Two feeding devices and secondary air spout 15.

The fan 1 is connected with the steam heater 2, and the steam heater 2 is connected with the steam turbine and the hydrophobic recoverer 4 respectively.

Both the biomass burner 16 and the secondary air nozzle 15 are installed on the boiler. The biomass burner 16 can be installed on the boiler separately, and can also be transformed from the original burner. The secondary air spout 15 needs on-site modification.

The crushing device includes a conveyor 5 and a crusher 6. The conveyor 5 is used to transport molded biomass fuel. The conveyor 5 can be a belt conveyor 5, and is equipped with a weighing sensor, which can measure the weight of the molded biomass fuel delivered in real time. Weight to control delivery volume. Crusher 6 is positioned at the below of the discharge end of conveyer 5, and crusher 6 is also connected with steam heater 2 by first air supply pipe 33, and first valve 17 is housed on the first air supply pipe 33, and crusher 6 is used for The molded biomass fuel is crushed into on-site biomass powder, and the on-site biomass powder is heated by hot air.

The first material storage device includes a cyclone separator 7 , a bag filter 8 , a first unloader 9 , a first silo 11 and a second unloader 10 . The first silo 11 is used to store the on-site biomass powder prepared by the crushing device; the cyclone separator 7 is respectively connected with the crusher 6, the bag filter 8 and the first unloader 9, and the first unloader 9 is connected with the first material The bin 11 is connected, and the bag filter 8 is connected with the first bin 11 through the second unloader 10 . The bag filter 8 is also connected to the secondary air nozzle 15 through the second air supply pipe 34 ; wherein, a fifth valve 21 is installed between the second air supply pipe 34 and the secondary air nozzle 15 .

The first feeding device comprises the third unloading machine 12, the first feeding pipe 31 and the seventh valve 23, wherein the third unloading machine 12 is connected with the first feed bin 11 and the first feeding pipe 31 respectively, and the first feeding pipe 31 is connected to the steam heater 2 through the seventh valve 23, and the first feeding pipe 31 is also connected to the biomass burner 16 through the sixth valve 22. A third valve 19 is also installed between the third unloader 12 and the first feed bin 11 . The first feeding device heats the on-site biomass powder in the first silo 11 and transports it to the biomass burner 16 .

The second storage device includes a second silo 13 for storing finished biomass powder.

The second feeding device comprises a fourth unloading machine 14, a fourth valve 20 and a second feeding pipe 32, and the fourth unloading machine 14 is connected with the second feed bin 13 and the second feeding pipe 32 respectively, wherein the fourth discharging A fourth valve 20 is installed between the machine 14 and the second feed bin 13. The second feeding pipe 32 is connected with the steam heater 2 through the second valve 18 , and the second feeding pipe 32 is connected with the biomass burner 16 through the sixth valve 22 . The second feeding device heats the finished biomass powder in the second silo 13 and transports it to the biomass burner 16 .

A sixth valve 22 is installed at the inlet of the biomass burner 16 , and both the first feeding pipe 31 and the second feeding pipe 32 are connected to the sixth valve 22 .

The first valve 17 to the seventh valve 23 are all electric valves.

The first unloading machine 9 to the fourth unloading machine 14 are star unloading machines, and all have automatic weighing function, and variable frequency control.

Fan 1 is a variable frequency fan.

The air temperature after passing through the steam heater 2 is measured by an online thermometer, and the outlet air temperature of the steam heater 2 is adjusted by adjusting the steam extraction volume of the steam turbine.

One or more crushers 6 can be installed, and multiple crushers 6 are arranged in series to ensure that the particle size of the treated biomass powder reaches 5 mm to 10 mm.

In some embodiments, a pulverized coal pipe 24 is also included, and the pulverized coal pipe 24 is respectively connected with the pulverized coal feeding device and the biomass burner 16 .

When working, the fan 1 presses air into the steam heater 2, and the steam heater 2 heats the air to 100-150°C. The heat source of the steam heater 2 comes from the extraction steam in the steam turbine. After the extraction steam releases heat, it becomes hydrophobic and hydrophobic. Enter the hydrophobic recoverer 4, and then enter the steam turbine heat recovery system.

The conveyor 5 transports the shaped biomass fuel to the crusher 6, and the crusher 6 crushes the shaped biomass fuel into on-site biomass powder with a particle size of 5 mm to 10 mm.

The air heated by the steam heater 2 is divided into three paths. The first path of hot air is sent to the crusher 6 through the first air supply pipe 33, and the hot air brings the crushed on-site biomass powder into the cyclone separator 7 in turn. And in the bag filter 8, the on-site biomass powder with a certain particle size settles in the cyclone separator 7 and the bag filter 8 in turn and enters the first silo 11, and the tail gas passes through the second air supply pipe 34 and the fifth valve 21 Enter the secondary air nozzle 15 for auxiliary combustion.

The third unloader 12 transports the on-site biomass powder in the first silo 11 to the first feed pipe 31, and the second hot air enters the first feed pipe 31 through the seventh valve 23, and the hot air carries the on-site biomass. The material powder enters the biomass burner 16 after passing through the sixth valve 22 .

The fourth unloader 14 transports the finished biomass powder in the second silo 13 to the second feeding pipe 32, and the third hot air enters the second feeding pipe 32 through the second valve 18, and the hot air carries the finished product to produce The material powder enters the biomass burner 16 after passing through the sixth valve 22 . The three-way air is arranged in parallel and can be used separately.

The technical principles of the present utility model have been described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the utility model, and cannot be construed as limiting the protection scope of the utility model in any way. Based on the explanations here, those skilled in the art can think of other specific implementations of the utility model without creative work, and these modes will all fall within the protection scope of the claims of the utility model.

Claims (10)

1. The utility model provides a system is burnt in mixture to living beings, includes fan (1) and biomass combustor (16), biomass combustor (16) are installed on the boiler, its characterized in that still includes:

the steam heater (2), the said steam heater (2) is connected with said blower (1) and steam turbine separately, used for heating the air;

the crushing device is connected with the steam heater (2) and is used for crushing and heating the formed biomass fuel;

the first storage device is connected with the crushing device and used for storing the field biomass powder prepared by the crushing device;

the first feeding device is respectively connected with the steam heater (2) and the biomass burner (16) and is used for conveying the field biomass powder in the first storage device to the biomass burner (16);

the second storage device is used for storing the finished product biomass powder; and

and the second feeding device is respectively connected with the second storage device and the biomass burner (16) and is used for conveying the finished product biomass powder in the second storage device to the biomass burner (16).

2. The biomass blending combustion system according to claim 1, further comprising a hydrophobic recoverer (4), wherein the hydrophobic recoverer (4) is connected with the steam heater (2).

3. The biomass co-combustion system as claimed in claim 1, wherein the crushing device comprises:

a conveyor (5), the conveyor (5) being for conveying a shaped biomass fuel; and

the crusher (6) is respectively connected with the conveyor (5) and the steam heater (2) and is used for crushing the formed biomass fuel into on-site biomass powder and heating the on-site biomass powder.

4. The biomass co-combustion system as claimed in claim 1, wherein the first storage device comprises:

a cyclone separator (7), the cyclone separator (7) being connected to the crushing device;

the bag-type dust collector (8), the bag-type dust collector (8) is connected with the cyclone separator (7);

a first unloader (9), the first unloader (9) being connected to the cyclone separator (7);

a first silo (11), wherein the first silo (11) is connected with the first unloader (9); and

the second discharging machine (10), the second discharging machine (10) respectively with sack cleaner (8) with first feed bin (11) are connected.

5. The biomass co-combustion system as claimed in claim 4, wherein the first feeding device comprises:

a third unloader (12), the third unloader (12) being connected to the first hopper (11);

a first feeding pipe (31), wherein the first feeding pipe (31) is respectively connected with the biomass burner (16), the third unloader (12) and the steam heater (2); and

a seventh valve (23), the seventh valve (23) being mounted on the first feeding pipe (31).

6. The biomass co-combustion system as claimed in claim 4, further comprising: the secondary air nozzle (15), secondary air nozzle (15) are fixed on the boiler, secondary air nozzle (15) still with sack cleaner (8) are connected.

7. The biomass blending combustion system as claimed in claim 1, wherein the second storage device comprises: a second silo (13), the second silo (13) being used for storing the finished biomass powder.

8. The biomass co-combustion system as claimed in claim 7, wherein the second feeding device comprises:

a fourth unloader (14), the fourth unloader (14) being connected to the second hopper (13); and

a second feed pipe (32), the second feed pipe (32) being connected to the fourth unloader (14), the steam heater (2), and the biomass burner (16), respectively.

9. The biomass co-combustion system as claimed in any one of claims 1 to 8, wherein the heating temperature of the steam heater (2) is 100-150 ℃, and the particle size of the on-site biomass powder is 5-10 mm.

10. The biomass co-combustion system as claimed in any one of claims 1 to 8, further comprising a pulverized coal pipe (24), wherein the pulverized coal pipe (24) is connected with the pulverized coal feeding device and the biomass burner (16), respectively.

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