Low-temperature low-pressure saturated steam pulverized coal boiler

Abstract

The utility model discloses a low-temperature low-pressure saturated steam pulverized coal boiler which comprises a hearth, a pulverized coal input end of the hearth is provided with a pulverized coal feeding device, the periphery of the hearth is provided with a water cooling wall, and the upper end of the hearth is sequentially provided with a water cooling evaporation screen, a slag solidification pipe bundle, a convection pipe bundle and a rear wall hanging pipe bundle in the smoke flowing direction. The upper end of the hearth communicates with a steering chamber, and an economizer is arranged on the lower portion of the steering chamber. Wherein the input end of the economizer is communicated with a water supply pipeline, a flow pressure regulating valve is arranged on the water supply pipeline, the output end of the economizer is communicated with a boiler barrel, the input ends and the output ends of the water cooling wall, the water cooling evaporation screen, the slag solidification pipe bundle, the convection pipe bundle and the rear wall hanging pipe bundle are all communicated with the boiler barrel, and the saturated steam output end of the boiler barrel is communicated with a main steam pipeline. The pressure and temperature of saturated steam exhausted from the main steam pipeline can be adjusted, and therefore low-temperature and low-pressure saturated steam can be generated easily.

Description

Technical Field

[0001] The utility model belongs to the technical field of pulverized coal boilers, and particularly relates to a low-temperature and low-pressure saturated steam pulverized coal boiler. Background Art

[0002] At present, the conventional pulverized coal boiler is a superheated steam pulverized coal boiler, but in the actual production and living process, only low-temperature and low-pressure saturated steam is required, and the superheated steam pulverized coal boiler cannot generate low-temperature and low-pressure saturated steam; in addition, the fuel of some saturated steam boilers is natural gas, but due to the high price of natural gas, the economic efficiency of these saturated steam boilers is poor. Summary of the Utility Model

[0003] The utility model aims to overcome the defects of the prior art and provides a low-temperature and low-pressure saturated steam pulverized coal boiler, which can generate low-temperature and low-pressure saturated steam.

[0004] The purpose of the utility model is realized by the following technical solutions:

[0005] A low-temperature and low-pressure saturated steam pulverized coal boiler, comprising:

[0006] A furnace, a pulverized coal input device is arranged at the pulverized coal input end of the furnace, water-cooled walls are arranged around the furnace, and a water-cooled evaporation screen, a slag-removing tube bundle, a convection tube bundle and a rear-wall suspension tube bundle are sequentially arranged at the upper end of the furnace along the flue gas flow direction;

[0007] A turning chamber, one end of the turning chamber is communicated with the upper end of the furnace, and an economizer is arranged at the lower part of the turning chamber;

[0008] Wherein, the input end of the economizer is communicated with a feed water pipeline, a flow and pressure regulating valve is arranged on the feed water pipeline, the output end of the economizer is communicated with a steam drum, the input ends and output ends of the water-cooled walls, the water-cooled evaporation screen, the slag-removing tube bundle, the convection tube bundle and the rear-wall suspension tube bundle are all communicated with the steam drum, and the saturated steam output end of the steam drum is communicated with a main steam pipeline.

[0009] The beneficial effects of adopting the above technical solution are as follows: The feed water pipe can supply water to the boiler drum via the economizer, and the boiler drum supplies water to the water wall, water-cooled evaporation screen, slag-congealing tube bundle, convection tube bundle, and rear wall suspension tube bundle, so as to exchange heat with the flue gas through the steam-water mixture heating surfaces such as the water wall, water-cooled evaporation screen, slag-congealing tube bundle, convection tube bundle, and rear wall suspension tube bundle, thereby generating only saturated steam and discharging it through the main steam pipe; among them, by adjusting the flow pressure regulating valve on the feed water pipe, the supply pressure of water can be adjusted, thereby indirectly adjusting the pressure of the saturated steam discharged from the main steam pipe; in addition, by adjusting the coal powder input device and the flow pressure regulating valve on the feed water pipe, it is beneficial to adjust the feed water volume and the coal powder input volume to match, thereby facilitating the saturated steam discharged from the main steam pipe to meet the flow requirements and facilitating the adjustment of the temperature of the saturated steam discharged from the main steam pipe; in summary, the low-temperature and low-pressure saturated steam pulverized coal boiler can adjust the pressure and temperature of the saturated steam discharged from the main steam pipe, thereby facilitating the generation of low-temperature and low-pressure saturated steam.

[0010] In one embodiment, the low-temperature and low-pressure saturated steam pulverized coal boiler includes a flue gas pipe, one end of the flue gas pipe is communicated with the end of the turning chamber far away from the furnace, and an air preheater is arranged in the flue gas pipe.

[0011] The beneficial effects of adopting the above technical solution are as follows: The air preheater can further reduce the flue gas temperature, which is beneficial to improving the boiler thermal efficiency.

[0012] In one embodiment, a plurality of air preheaters are arranged in the flue gas pipe along the flue gas flow direction.

[0013] The beneficial effects of adopting the above technical solution are as follows: Such an arrangement is beneficial to further improving the boiler thermal efficiency.

[0014] In one embodiment, two adjacent air preheaters are communicated with each other.

[0015] In one embodiment, the air preheaters are sequentially arranged in the flue gas pipe.

[0016] The beneficial effects of adopting the above technical solution are as follows: Such an arrangement is beneficial to increasing the heat exchange area, thereby being beneficial to further improving the boiler thermal efficiency.

[0017] In one embodiment, the low-temperature and low-pressure saturated steam pulverized coal boiler includes a controller, and the controller is electrically connected to the coal powder input device and the flow pressure regulating valve.

[0018] The beneficial effects of adopting the above technical solution are as follows: The flow pressure regulating valve can be adjusted in matching with the coal powder input device, which is beneficial to making the feed water volume and the coal powder input volume match automatically.

[0019] In one embodiment, a plurality of economizers are sequentially arranged along the flue gas flow direction at the lower part of the turning chamber.

[0020] The beneficial effects of adopting the above technical solution are as follows: With such a setting, it is beneficial to further improve the thermal efficiency of the boiler.

[0021] In one embodiment, the economizers of adjacent two provinces are interconnected.

[0022] In one embodiment, a pulverized coal burner is arranged at the lower part of the furnace.

[0023] The beneficial effects of the present utility model lie in:

[0024] By adjusting the flow pressure regulating valve on the feed water pipe, the supply pressure of water can be adjusted, thereby indirectly adjusting the saturated steam pressure discharged from the main steam pipe; in addition, by adjusting the flow pressure regulating valves on the pulverized coal feeding device and the feed water pipe, it is beneficial to adjust the feed water volume and the pulverized coal feeding volume to match, so as to be beneficial to making the saturated steam discharged from the main steam pipe meet the flow requirements, and it is beneficial to adjusting the saturated steam temperature discharged from the main steam pipe; in summary, this low-temperature and low-pressure saturated steam pulverized coal boiler can adjust the saturated steam pressure and temperature discharged from the main steam pipe, so as to be beneficial to generating low-temperature and low-pressure saturated steam. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Hereinafter, the present utility model will be described in more detail based on embodiments and with reference to the drawings.

[0026] Wherein:

[0027] Figure 1 shows a schematic structural diagram of an embodiment of the present utility model;

[0028] In the drawings, the same components are denoted by the same reference numerals. The drawings are not drawn to actual scale.

[0029] Reference numerals:

[0030] 1 - furnace, 2 - pulverized coal burner, 3 - water-cooled evaporation screen, 4 - slag-congealing tube bundle, 5 - convection tube bundle, 6 - main steam pipe, 7 - boiler drum, 8 - turning chamber, 9 - economizer, 10 - air preheater, 11 - flue gas pipe, 12 - feed water pipe, 13 - flow pressure regulating valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The following will further illustrate the present utility model with reference to the drawings.

[0032] The present utility model provides a low-temperature and low-pressure saturated steam pulverized coal boiler, as Figure 1 shown, which includes:

[0033] Furnace 1, a pulverized coal input device is provided at the pulverized coal input end of Furnace 1, water-cooled walls are arranged around Furnace 1, and a water-cooled evaporation screen 3, a slag-removing tube bundle 4, a convection tube bundle 5, and a rear wall suspension tube bundle are sequentially arranged along the flue gas flow direction at the upper end of Furnace 1;

[0034] Diversion chamber 8, one end of the diversion chamber 8 is connected to the upper end of Furnace 1, and an economizer 9 is arranged at the lower part of the diversion chamber 8;

[0035] Among them, a feed water pipe 12 is connected to the input end of the economizer 9, a flow and pressure regulating valve 13 is arranged on the feed water pipe 12, the output end of the economizer 9 is connected to a steam drum 7, the input ends and output ends of the water-cooled wall, the water-cooled evaporation screen 3, the slag-removing tube bundle 4, the convection tube bundle 5, and the rear wall suspension tube bundle are all connected to the steam drum 7, and the saturated steam output end of the steam drum 7 is connected to a main steam pipe 6.

[0036] It can be understood that the feed water pipe 12 can supply water to the steam drum 7 through the economizer 9, and the steam drum 7 supplies water to the water-cooled wall, the water-cooled evaporation screen 3, the slag-removing tube bundle 4, the convection tube bundle 5, and the rear wall suspension tube bundle. Without setting a superheater and a desuperheater, heat exchange with flue gas is carried out through the water-cooled wall, the water-cooled evaporation screen 3, the slag-removing tube bundle 4, the convection tube bundle 5, and the rear wall suspension tube bundle and other steam-water mixture heating surfaces, so as to only generate saturated steam and discharge it from the main steam pipe 6; among them, by adjusting the flow and pressure regulating valve 13 on the feed water pipe 12, the supply pressure of water can be adjusted, so as to indirectly adjust the saturated steam pressure discharged from the main steam pipe 6; in addition, by adjusting the pulverized coal input device and the flow and pressure regulating valve 13 on the feed water pipe 12, it is beneficial to adjust the feed water volume and the pulverized coal input volume to match, so as to be beneficial to making the saturated steam discharged from the main steam pipe 6 meet the flow requirements, and is beneficial to adjusting the saturated steam temperature discharged from the main steam pipe 6; in summary, this low-temperature and low-pressure saturated steam pulverized coal boiler can adjust the saturated steam pressure and temperature discharged from the main steam pipe 6, so as to be beneficial to generating low-temperature and low-pressure saturated steam.

[0037] It should be noted that the flue gas flows through Furnace 1, the water-cooled evaporation screen 3, the slag-removing tube bundle 4, the convection tube bundle 5, the rear wall suspension tube bundle, the diversion chamber 8, the economizer 9, and the air preheater in sequence; the pulverized coal input device can be a pulverized coal conveyor.

[0038] In one embodiment, the low-temperature and low-pressure saturated steam pulverized coal boiler includes a flue gas pipe 11, one end of the flue gas pipe 11 is connected to the end of the diversion chamber 8 far away from Furnace 1, and an air preheater 10 is arranged in the flue gas pipe 11.

[0039] It can be understood that the air preheater 10 can further reduce the flue gas temperature, so as to be beneficial to improving the boiler thermal efficiency.

[0040] It should be noted that the cold air enters the air preheater 10 from the lower end and is discharged from the upper end of the air preheater 10.

[0041] In one embodiment, a plurality of air preheaters 10 are arranged in the flue gas pipe 11 along the flue gas flow direction to further improve the boiler thermal efficiency; two adjacent air preheaters 10 are interconnected.

[0042] In one embodiment, the air preheaters 10 are sequentially arranged in the flue gas pipe 11 to increase the heat exchange area, thereby further improving the boiler thermal efficiency.

[0043] In one embodiment, the low-temperature and low-pressure saturated steam pulverized coal boiler includes a controller, which is electrically connected to the pulverized coal feeding device and the flow and pressure regulating valve 13; the controller can be a PCB board equipped with a C51 single-chip microcomputer.

[0044] It can be understood that the flow and pressure regulating valve 13 can be adjusted in matching with the pulverized coal feeding device to facilitate the self-matching of the water supply amount and the pulverized coal feeding amount.

[0045] In one embodiment, a plurality of economizers 9 are sequentially arranged in the turning chamber 8 along the flue gas flow direction to further improve the boiler thermal efficiency; two adjacent economizers 9 are interconnected.

[0046] In one embodiment, a pulverized coal burner 2 is arranged at the lower part of the furnace 1.

[0047] In addition, compared with other saturated steam boilers, the saturated steam pulverized coal boiler has the advantages of high thermal efficiency, stable operation, small maintenance workload, low fuel cost and low operation cost. When the present utility model is actually used, its specific parameters are as follows:

[0048] Evaporation rate: 100 t / h Saturated steam pressure: 1.57 MPa.g Saturated steam temperature: 203 ℃ Feed water temperature: 105 ℃ Boiler efficiency: ≥90 ％ Boiler type: Pulverized coal furnace Fuel type: Coal

[0049] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0050] Although the present utility model has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present utility model. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed, as long as they do not depart from the spirit and scope of the present utility model as defined by the appended claims. It should be understood that different dependent claims and the features described herein can be combined in a manner different from that described in the original claims. It should also be understood that the features described in connection with a single embodiment can be used in other described embodiments.

Claims

1. A low-temperature, low-pressure saturated steam pulverized coal boiler, characterized in that: include: A furnace (1), wherein a pulverized coal input end of the furnace (1) is provided with a pulverized coal input device, water-cooled walls are provided around the furnace (1), and a water-cooled evaporation screen (3), a slag condensation tube bundle (4), a convection tube bundle (5) and a rear wall hanging tube bundle are sequentially provided at the upper end of the furnace (1) along the flue gas flow direction; a turning chamber (8), one end of the turning chamber (8) being in communication with the upper end of the furnace (1), and a coal economizer (9) being arranged at the lower part of the turning chamber (8); The input end of the economizer (9) is connected to a water supply pipe (12), and a flow pressure regulating valve (13) is arranged on the water supply pipe (12). The output end of the economizer (9) is connected to a boiler drum (7). The input end and the output end of the water-cooled wall, the water-cooled evaporation screen (3), the slag condensing tube bundle (4), the convection tube bundle (5) and the rear wall hanging tube bundle are all connected to the boiler drum (7). The saturated steam output end of the boiler drum (7) is connected to a main steam pipe (6).

2. A low-temperature, low-pressure saturated steam pulverized coal boiler according to claim 1, characterized in that: It comprises a flue gas pipe (11), one end of which is connected to an end of the turning chamber (8) away from the furnace (1), and an air preheater (10) is arranged in the flue gas pipe (11).

3. A low-temperature, low-pressure saturated steam pulverized coal boiler according to claim 2, characterized in that: A plurality of air preheaters (10) are arranged in the flue gas pipe (11) along the flue gas flow direction.

4. A low-temperature, low-pressure saturated steam pulverized coal boiler according to claim 3, characterized in that: The two adjacent air preheaters (10) are connected to each other.

5. A low-temperature, low-pressure saturated steam pulverized coal boiler according to claim 2, characterized in that: The air preheater (10) is sequentially arranged in the flue gas pipe (11).

6. A low-temperature, low-pressure saturated steam pulverized coal boiler according to claim 1, characterized in that: It comprises a controller, wherein the controller is electrically connected to the pulverized coal feeding device and the flow pressure regulating valve (13).

7. The low-temperature, low-pressure saturated steam pulverized coal boiler according to claim 1, characterized in that: A plurality of economizers (9) are arranged in sequence at the lower part of the turning chamber (8) along the flue gas flow direction.

8. The low-temperature, low-pressure saturated steam pulverized coal boiler according to claim 7, characterized in that: The two adjacent economizers (9) are connected to each other.

9. The low-temperature, low-pressure saturated steam pulverized coal boiler according to claim 1, characterized in that: A pulverized coal burner (2) is provided at the lower part of the furnace (1).

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