Bed material adding mechanism of circulating fluidized bed boiler

Abstract

The utility model discloses a bed material adding mechanism of a circulating fluidized bed boiler, which relates to the field of circulating fluidized bed boilers and comprises a stock bin, a feeding pipe, a feeding device, a hearth, a feeding header pipe, a first feeding pipe, a second feeding pipe and a material returning pipe. One end of the charging header pipe is connected with a discharging port of the charging device, the other end of the charging header pipe is connected with one end of the first charging pipe and one end of the second charging pipe, the other end of the first charging pipe is connected with a feeding port of the hearth, the other end of the second charging pipe is connected with the upper portion of the material returning pipe, and one end of the material returning pipe is connected with a material returning port of the hearth. The device has the advantages that bed materials can be supplemented and increased to the hearth through the second feeding pipe in the starting process after the device is installed, and the bed temperature and NOX emission of the hearth are effectively reduced.

Description

Technical Field

[0001] The utility model relates to the field of circulating fluidized bed boilers, in particular to a bed material adding mechanism for a circulating fluidized bed boiler. Background Art

[0002] Circulating fluidized bed boilers use fluidized combustion, and their main structure consists of two parts: the furnace and the circulating recirculation furnace. Due to the characteristics of the existing circulating fluidized bed boilers, there is a phenomenon of excessively fast furnace bed material loss during the startup process, which easily leads to high furnace bed temperature and the furnace outlet temperature not reaching the urea reaction temperature. This leads to slow boiler load following, long startup time and NO X Exceeding standards and other issues. Utility Model Content

[0003] The technical problem to be solved by the utility model is to reduce the furnace bed temperature and NO X emission.

[0004] The utility model solves the above-mentioned technical problems through the following technical means: a circulating fluidized bed boiler bed material feeding mechanism, comprising a silo, a feeding pipe, a feeding device, a furnace, a feeding main pipe, a first feeding pipe, a second feeding pipe and a return pipe, the discharge port of the silo is connected to the feed port of the feeding device through the feeding pipe, one end of the feeding main pipe is connected to the discharge port of the feeding device, the other end of the feeding main pipe is respectively connected to one end of the first feeding pipe and the second feeding pipe, the other end of the first feeding pipe is connected to the feed port of the furnace, the other end of the second feeding pipe is connected to the upper part of the return pipe, and one end of the return pipe is connected to the return port of the furnace.

[0005] As an optimized technical solution, the circulating fluidized bed boiler bed material feeding mechanism further includes a compressed air intake device, and a portion of the second feeding pipe located upstream of the second valve is sealed with a compressed air intake device.

[0006] As an optimized technical solution, the circulating fluidized bed boiler bed material feeding mechanism further includes a cyclone separator, and the other end of the return pipe is connected to the discharge port of the cyclone separator.

[0007] As an optimized technical solution, the return pipe includes a horizontal pipe section connected to the discharge port of the cyclone separator and an inclined pipe section extending downward from the horizontal pipe section to the return port connected to the furnace, and the second feeding pipe is connected to the middle of the horizontal pipe section.

[0008] As an optimized technical solution, a first valve is provided on the first feeding pipe, and a second valve is provided on the second feeding pipe.

[0009] As an optimized technical solution, the first valve and the second valve are both stainless steel manual plug-in valves.

[0010] As an optimized technical solution, the second feeding pipe is made of 310S stainless steel pipe.

[0011] As an optimized technical solution, the feeding device adopts a bucket elevator.

[0012] The advantages of this utility model are: simple structure, easy to use, reliable operation, after the equipment is installed, the furnace bed material can be supplemented through the second feeding pipe according to the operating conditions during the startup process, effectively reducing the furnace bed temperature and NO X Emissions; It strengthens the load-following capability of the circulating fluidized bed boiler. Under the same conditions, within the scope specified by the regulations, it can be put into high-pressure heating and AGC operation earlier; It effectively improves the load-following capability after deep peak regulation during unit operation. The boiler burns at low load all day during the day, and the bed material layer is thin. The coal feeding speed cannot be too fast, otherwise it will cause rapid fluctuations in bed temperature and even low-temperature coking. The circulating fluidized bed boiler bed material feeding mechanism can quickly accumulate bed material and reduce bed temperature, thereby achieving the effect of rapid load-following, effectively improving the unit utilization rate, and has great promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a structural schematic diagram of the bed material adding mechanism of the circulating fluidized bed boiler according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0014] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0015] like Figure 1 As shown, an embodiment of the utility model discloses a circulating fluidized bed boiler bed material feeding mechanism, including a silo 1, a feed pipe 2, a feeding device 3, a furnace 4, a feeding main pipe 5, a first feeding pipe 6, a first valve 7, a second feeding pipe 8, a second valve 9, a return pipe 10, a cyclone separator 11 and a compressed air intake device (not shown).

[0016] The feeding device 3 adopts a bucket elevator, and the discharge port of the silo 1 is connected to the feed port of the feeding device 3 through the feed pipe 2; one end of the feeding main pipe 5 is connected to the discharge port of the feeding device 3, and the other end of the feeding main pipe 5 is respectively connected to one end of the first feeding pipe 6 and the second feeding pipe 8 through a three-way joint, the other end of the first feeding pipe 6 is connected to the feed port of the furnace 4, and the other end of the second feeding pipe 8 is connected to the upper part of the return pipe 10; one end of the return pipe 10 is connected to the return port of the furnace 4, and the other end of the return pipe 10 is connected to the discharge port of the cyclone separator 11.

[0017] The first feeding pipe 6 is provided with a first valve 7 , and the second feeding pipe 8 is provided with a second valve 9 . Both the first valve 7 and the second valve 9 are stainless steel manual plug-in valves.

[0018] The second feeding pipe 8 is made of 310S stainless steel Φ159mm pipe, and the inner side of the junction between the second feeding pipe 8 and the return pipe 10 is paved with mullite corundum powder plastic, which can withstand high temperatures above 900°C as a whole.

[0019] The portion of the second feeding pipe 8 upstream of the second valve 9 is sealed with a compressed air intake device for intake of cooling air and anti-blocking purge air.

[0020] The return pipe 10 includes a horizontal pipe section connected to the discharge port of the cyclone separator 11 and an inclined pipe section extending downward from the horizontal pipe section to the return port connected to the furnace 4. The second feeding pipe 8 is connected to the middle of the horizontal pipe section.

[0021] The circulating fluidized bed boiler bed material feeding mechanism has a simple structure, is easy to use, and operates reliably. During the startup process after the equipment is installed, the bed material can be added to the furnace 4 through the second feeding pipe 8 according to the operating conditions, effectively reducing the bed temperature. The average bed temperature can be reduced by 100°C; effectively controlling NO X Exceeding the standard time reduces NO X Emissions; It strengthens the load-following capability of the circulating fluidized bed boiler. Under the same conditions, within the scope specified by the regulations, it can be put into high-pressure heating and AGC operation earlier; It effectively improves the load-following capability after deep peak regulation during unit operation. The boiler burns at low load all day during the day, and the bed material layer is thin. The coal feeding speed cannot be too fast, otherwise it will cause rapid fluctuations in bed temperature and even low-temperature coking. The circulating fluidized bed boiler bed material feeding mechanism can quickly accumulate bed material and reduce bed temperature, thereby achieving the effect of rapid load-following, effectively improving the unit utilization rate, and has great promotion value.

[0022] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, it should be understood by those skilled in the art that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A circulating fluidized bed boiler bed material feeding mechanism, characterized by: It includes a silo, a feeding pipe, a feeding device, a furnace, a feeding main pipe, a first feeding pipe, a second feeding pipe and a return pipe. The discharge port of the silo is connected to the feed port of the feeding device through the feeding pipe, one end of the feeding main pipe is connected to the discharge port of the feeding device, the other end of the feeding main pipe is respectively connected to one end of the first feeding pipe and the second feeding pipe, the other end of the first feeding pipe is connected to the feed port of the furnace, the other end of the second feeding pipe is connected to the upper part of the return pipe, and one end of the return pipe is connected to the return port of the furnace.

2. The circulating fluidized bed boiler bed material feeding mechanism according to claim 1, characterized in that: The circulating fluidized bed boiler bed material feeding mechanism also includes a compressed air intake device, a second valve is provided on the second feeding pipe, and a compressed air intake device is sealed on a portion of the second feeding pipe located upstream of the second valve.

3. The circulating fluidized bed boiler bed material feeding mechanism according to claim 1, characterized in that: The circulating fluidized bed boiler bed material feeding mechanism further includes a cyclone separator, and the other end of the return pipe is connected to the discharge port of the cyclone separator.

4. The circulating fluidized bed boiler bed material feeding mechanism according to claim 3, characterized in that: The return pipe includes a horizontal pipe section connected to the discharge port of the cyclone separator and an inclined pipe section extending downward from the horizontal pipe section to the return port connected to the furnace, and the second feeding pipe is connected to the middle of the horizontal pipe section.

5. The circulating fluidized bed boiler bed material feeding mechanism according to claim 2, characterized in that: The circulating fluidized bed boiler bed material feeding mechanism further includes a first valve, and the first feeding pipe is provided with the first valve.

6. The circulating fluidized bed boiler bed material feeding mechanism according to claim 5, characterized in that: The first valve and the second valve are both stainless steel manual plug-in valves.

7. The circulating fluidized bed boiler bed material feeding mechanism according to claim 1, characterized in that: The second feeding pipe is made of 310S stainless steel pipe.

8. The circulating fluidized bed boiler bed material feeding mechanism according to claim 1, characterized in that: The feeding device adopts a bucket elevator.

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