Water supply system of steam generator in biomass circulating fluidized bed hot water boiler

Abstract

The utility model discloses a water supply system of a steam generator in a biomass circulating fluidized bed hot water boiler. The water supply system solves the problem of how to enable the steam generator in a water supply boiler to operate stably. A steam generator water supply port (12) is communicated with an output port of a thermal deaerator (14) through a steam generator water supply pump (13), a first water inlet (15) of the thermal deaerator is connected with a reverse osmosis water filter (16), and a water input port of the reverse osmosis water filter is a steam generation system water supply port (17); a steam output port (11) is connected with tee joints, a second port of the first tee joint is connected with a steam blowing conveying pipeline (19), the steam blowing conveying pipeline is connected with a high-temperature economizer steam blowing device (20), and a third port of the first tee joint (18) is connected with a steam manifold (22). And a third outlet (25) of the steam manifold is communicated with a steam input end of the shell-and-tube steam-water heat exchanger (26).

Description

TECHNICAL FIELD

[0001] The utility model relates to a circulating fluidized bed hot water boiler, especially to a water supply system of steam generator in the biomass circulating fluidized bed hot water boiler. BACKGROUND

[0002] The biomass resource reserves of China are about 5 billion tons, and the biomass energy utilization rate accounts for 9.2% of the total in 2019, and the biomass resources are widely used in the preparation of fuel, organic fertilizer, activated carbon and degradable packaging, and the biomass hot water boiler is directly used as fuel combustion, and the energy generated by combustion is converted into hot water, a large amount of alkali metal is generated in the biomass fuel combustion, and the ash melting point is also very low, so that the slagging and ash deposition of the heating surface of the boiler are serious, and even the alkali corrosion of the heating surface is caused, which affects the safe operation of the boiler, therefore, the biomass boiler needs to blow ash treatment to the heating surface, if the steam blowing method is used to blow ash to the heating surface in the boiler, better ash blowing effect can be obtained, but the conventional biomass hot water boiler does not have a steam source, if the steam blowing is used, the external steam needs to be introduced into the boiler, due to the limitation of the steam source, the popularization of the biomass hot water boiler is seriously restricted, if the steam generator is arranged in the tail flue of the hot water boiler, the steam is generated by using the high-temperature flue gas of 700-800 degrees in the tail flue, and the steam is used to blow and clean the heating surface of the high-temperature economizer and the heating surface of the low-temperature economizer in the hot water boiler, since the steam blowing and cleaning is carried out periodically or intermittently, the demand for steam is limited, but the steam generation in the tail flue is continuous, how to make the water supply system of the steam generator run stably and safely, and ensure the normal operation of the steam blowing and cleaning is a problem that needs to be solved first. SUMMARY

[0003] The utility model provides a kind of water supply system of steam generator in biomass circulating fluidized bed hot water boiler, solve how to make the technical problem of safe and stable operation of steam generator in water supply boiler.

[0004] The utility model is through following technical scheme solves above technical problem:

[0005] The water supply system of the steam generator in the biomass circulating fluidized bed hot water boiler comprises a furnace, a drum, a tail first flue and a tail second flue, a high-temperature economizer is arranged in the tail first flue, a low-temperature economizer is arranged in the tail second flue, a water inlet and steam outlet header is arranged at the top end of the tail first flue, a steam generator lower header and an evaporation tube bundle are arranged in the tail first flue below the water inlet and steam outlet header, a steam generator feed water inlet and a steam outlet are arranged on the water inlet and steam outlet header respectively, the steam generator feed water inlet is communicated with the steam generator lower header through a steam generator water feeding vertical pipe, the evaporation tube bundle is connected to the steam generator lower header, and the upper end of the evaporation tube bundle is communicated with the water inlet and steam outlet header.

[0006] A second three-way pipe is connected to the steam generation system feed water inlet, a second port of the second three-way pipe is communicated with the boiler feed water inlet, a third port of the second three-way pipe is connected to a boiler common water supply treatment system, the boiler feed water inlet is arranged on the low-temperature economizer, and a water outlet of the low-temperature economizer is communicated with the drum through a water feeding pipe.

[0007] The water supply of the steam generation system and the boiler water supply are organically combined together, and the steam generated by the steam generation system is converted into condensate water through the tubular shell type steam-water heat exchanger to supply the steam generator under the premise that the steam meets the requirement of the steam soot blower, so that the heat of the residual steam is exchanged to the water supply pipe network, the steam energy is fully utilized, the hot water boiler steam is self-produced, the energy is fully utilized, and the economic value of the biomass hot water boiler is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 is a structural schematic view of the biomass hot water boiler of the utility model;

[0009] Figure 2It is a structural schematic diagram of the water supply system of the steam generator of the present utility model. DETAILED DESCRIPTION

[0010] The utility model is described in detail below with reference to the accompanying drawings:

[0011] A biomass circulating fluidized bed hot water boiler with a steam generator comprises a furnace 1, a drum 2, a screw feeder, a cyclone separator, a first tail flue 3 and a second tail flue 4. A screw feeder is connected to the fuel feeding port of the drum 2, and the biomass fuel is fed into the furnace 1 through the screw feeder. The upper end of the furnace 1 is connected to the cyclone separator through a connecting flue, and the cyclone separator is connected to the furnace 1 through a return pipe; the first tail flue 3 and the second tail flue 4 are arranged in an N shape, a high-temperature economizer 5 is provided in the first tail flue 3, and a low-temperature economizer 6 and an air preheater are respectively provided in the second tail flue 4. A high-temperature economizer steam blower 20 is provided on the high-temperature economizer 5, and a low-temperature economizer steam blower 21 is provided on the low-temperature economizer 4. The steam blowers are used to blow the heating surfaces of the high and low-temperature economizers to prevent slagging and ash accumulation; a water inlet and steam outlet header 7 is provided at the top of the tail first flue 3, and a steam generator lower header 9 and an evaporation tube bundle 10 are provided in the tail first flue 3 below the water inlet and steam outlet header 7. A steam generator water inlet 12 and a steam output port 11 are provided on the water inlet and steam outlet header 9 respectively. The steam generator water inlet 12 is connected to the steam generator lower header 9 through the steam generator water supply riser 8. The evaporation tube bundle 10 is connected to the steam generator lower header 9, and the upper end of the evaporation tube bundle 10 is connected to the water inlet and steam outlet headers; the steam generator water inlet 12 is connected to the output port of the thermal deaerator 14 through the steam generator water pump 13, and the first water inlet 15 of the thermal deaerator 14 is connected to the reverse osmosis water filter 16, and the water input port of the reverse osmosis water filter 16 is the steam generation system water inlet 17; the steam output port 11 is connected to the first tee 18, and the second port of the first tee 18 is connected to the steam purge delivery pipeline 19, and the steam purge delivery pipeline 19 is respectively connected to the high-temperature economizer steam purge 20 and a low-temperature economizer steam purge 21. A steam sub-cylinder 22 is connected to the third port of the first tee 18. A plant steam pipeline is connected to the first outlet 23 of the steam sub-cylinder 22. The second outlet 24 of the steam sub-cylinder 22 is connected to the steam input port 35 of the thermal deaerator 14. The third outlet 25 of the steam sub-cylinder 22 is connected to the steam input end of the shell and tube steam-water heat exchanger 26. The condensate output end 27 of the shell and tube steam-water heat exchanger 26 is connected to the second water inlet 28 of the thermal deaerator 14. The shell and tube steam-water heat exchanger 26 is also provided with a heat network return water input port 29 and a heat network water output port 30.

[0012] The low-temperature economizer 6 is provided with a boiler feed water inlet 33, and the cold water feed inlet of the hot water boiler is arranged on the low-temperature economizer 6. The membrane wall lower header, the membrane wall upper header and the membrane wall are arranged in the furnace 1 respectively. The boiler drum 2 is communicated with the membrane wall lower header through a downcomer. The membrane wall is arranged between the membrane wall lower header and the membrane wall upper header. The membrane wall upper header is communicated with the boiler drum 2 through a top water guide pipe. The hot water outlet of the boiler drum 2 is connected with a hot water delivery pipe, and the hot water delivery pipe is connected with the high-temperature economizer 5. The boiler hot water outlet is arranged on the high-temperature economizer 5. The second three-way pipe 32 is connected with the steam generating system feed water inlet 17. The second port of the second three-way pipe 32 is communicated with the boiler feed water inlet 33. The boiler common water supply treatment system 31 is connected with the third port of the second three-way pipe 32. The water outlet of the low-temperature economizer 6 is communicated with the boiler drum 2 through a water delivery pipe 34.

[0013] The boiler feed water is firstly introduced into the low-temperature economizer 6 through the boiler feed water inlet 17 arranged on the low-temperature economizer 6, and is heated by the flue gas in the tail second flue 4. The initially heated water is introduced into the boiler drum 2 through the water delivery pipe 34, and is introduced into the membrane wall lower header through the downcomer. The water is collected in the membrane wall upper header after being heated by the membrane wall, and is introduced into the boiler drum 2 through the top water guide pipe. The hot water outlet of the boiler drum 2 is connected with the hot water delivery pipe, and the hot water is delivered to the high-temperature economizer 5. The water in the high-temperature economizer 5 is further heated by the high-temperature flue gas in the tail first flue 3, and is output through the boiler hot water outlet.

Claims

1. A water supply system for a steam generator in a biomass circulating fluidized bed hot water boiler, comprising a furnace (1), a drum (2), a first tail flue (3) and a second tail flue (4), a high-temperature economizer (5) is arranged in the first tail flue (3), and a low-temperature economizer (6) is arranged in the second tail flue (4), characterized in that, The tail first flue (3) is provided with a water inlet and steam outlet header (7) at the top end, a steam generator lower header (9) and an evaporation tube bundle (10) are arranged in the tail first flue (3) below the water inlet and steam outlet header (7), a steam generator water inlet (12) and a steam outlet (11) are respectively arranged on the water inlet and steam outlet header (7), the steam generator water inlet (12) is communicated with the steam generator lower header (9) through a steam generator water feeding vertical pipe (8), the evaporation tube bundle (10) is connected to the steam generator lower header (9), and the upper end of the evaporation tube bundle (10) is communicated with the water inlet and steam outlet header; the steam generator water inlet (12) is communicated with the output port of a thermal deaerator (14) through a steam generator water pump (13), a reverse osmosis water filter (16) is connected to the first water inlet (15) of the thermal deaerator (14), and the water input port of the reverse osmosis water filter (16) is a steam generation system water inlet (17); a first three-way pipe (18) is connected to the steam outlet (11), a steam purging and conveying pipeline (19) is connected to the second port of the first three-way pipe (18), a high-temperature economizer steam purging device (20) and a low-temperature economizer steam purging device (21) are respectively connected to the steam purging and conveying pipeline (19), a steam distribution cylinder (22) is connected to the third port of the first three-way pipe (18), a plant steam pipeline is connected to the first outlet (23) of the steam distribution cylinder (22), the second outlet (24) of the steam distribution cylinder (22) is communicated with the steam input port (35) of the thermal deaerator (14), the third outlet (25) of the steam distribution cylinder (22) is communicated with the steam input end of a tube-shell type steam-water heat exchanger (26), the condensate water output end (27) of the tube-shell type steam-water heat exchanger (26) is communicated with the second water inlet (28) of the thermal deaerator (14), and a heat network backwater input port (29) and a heat network outlet water output port (30) are further arranged on the tube-shell type steam-water heat exchanger (26).

2. A water supply system for a steam generator of a biomass circulating fluidized bed hot water boiler according to claim 1, characterized in that, A second three-way pipe (32) is connected to the steam generation system water inlet (17), the second port of the second three-way pipe (32) is communicated with a boiler water inlet (33), and a boiler common water supply treatment system (31) is connected to the third port of the second three-way pipe (32); the boiler water inlet (33) is arranged on a low-temperature economizer (6), and the water outlet of the low-temperature economizer (6) is communicated with a boiler drum (2) through a water feeding pipeline (34).

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