System for neutralizing condensed water temperature and drying biomass fuel by using flue gas waste heat

Abstract

The utility model relates to a system utilizing flue gas waste heat to neutralize condensed water and dry biomass fuel, which comprises a heat exchanger and a boiler, the heat exchanger is connected with a condenser through a condensed water circulating pump, and the heat exchanger is connected with a condensed water pipeline at the bottom of a feeding belt through a first communication pipeline. The feeding belt bottom condensation water pipeline is connected with a stock bin bottom longitudinal condensation water pipeline which is connected with a condenser through a second communication pipeline, the condenser is connected with a steam turbine, the boiler is connected with a chimney through an induced draft fan and a dust remover, and a third communication pipeline is connected between the induced draft fan and the dust remover. The third communication pipeline is connected with a heat source inlet of the heat exchanger through a heat exchange fan, a heat source outlet of the heat exchanger is connected with a stock bin bottom transverse flue gas pipeline through a fourth communication pipeline, and the stock bin bottom transverse flue gas pipeline is connected between the induced draft fan and the dust remover through a fifth communication pipeline. The device can recycle part of flue gas waste heat and condensed water waste heat.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas waste heat recovery and utilization, in particular to a system that utilizes flue gas waste heat to neutralize condensation water temperature and dry biomass fuel. Background Art

[0002] Biomass power generation is a renewable energy generation technology that uses biomass to generate electricity. Among them, direct combustion of agricultural and forestry waste is a relatively common form of biomass power generation. However, since the storage of agricultural and forestry waste is easily affected by air humidity, the high moisture content in the fuel leads to insufficient fuel calorific value, which will cause the unit to be in a high load state, further resulting in insufficient power generation and affecting the economy of the power plant. For most power plants that burn agricultural and forestry waste, how to transform the fuel drying system to reduce the moisture content in the fuel and increase the calorific value is a difficult problem that needs to be solved.

[0003] At present, the solutions to the problem of wet fuel mainly include reforming the feeding system (improving the degree of fuel crushing by the crusher), tipping the fuel by manual forklift, increasing the primary air temperature, etc. However, the intensity of manual tipping is relatively high, and increasing the primary air temperature alone still cannot meet the drying requirements of agricultural and forestry waste fuels. The processing of the crushing feeder is also restricted (usually for circulating fluidized bed units, too fast fuel feeding can easily cause excessive fuel accumulation on the bed), and because of the high debris and moisture content in agricultural and forestry wastes, it is easy to cause feeder blockage and incomplete combustion, affecting the load regulation ability of the unit. Utility Model Content

[0004] The utility model aims to solve the deficiencies of the prior art and provides a system which utilizes flue gas waste heat to neutralize condensed water temperature and dry biomass fuel.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0006] A system for utilizing flue gas waste heat to neutralize condensate water temperature and dry biomass fuel, comprising a heat exchanger and a boiler, wherein a condensate water pipeline is arranged in the heat exchanger, wherein the inlet of the condensate water pipeline in the heat exchanger is connected to a condenser via a condensate water circulation pump, wherein the outlet of the condensate water pipeline in the heat exchanger is connected to a condensate water pipeline at the bottom of a feeding belt via a first connecting pipeline, wherein the condensate water pipeline at the bottom of the feeding belt is arranged directly below the feeding belt, wherein the feeding belt and the condensate water pipeline at the bottom of the feeding belt are arranged obliquely, wherein the condensate water pipeline at the bottom of the feeding belt is connected to a longitudinal condensate water pipeline at the bottom of a silo, wherein the condensate water pipeline at the bottom of the silo is connected to a longitudinal condensate water pipeline at the bottom of the silo The longitudinal condensate pipe is connected to the condenser through the second connecting pipe, the condenser is connected to the steam turbine, the boiler is connected to the chimney through the induced draft fan and the dust collector, the third connecting pipe is connected between the induced draft fan and the dust collector, the third connecting pipe is connected to the heat source inlet of the heat exchanger through the heat exchange fan, the heat source outlet of the heat exchanger is connected to the transverse flue gas pipe at the bottom of the silo through the fourth connecting pipe, the longitudinal condensate pipe at the bottom of the silo and the transverse flue gas pipe at the bottom of the silo are arranged vertically and horizontally at the bottom of the silo, and the transverse flue gas pipe at the bottom of the silo is connected between the induced draft fan and the dust collector through the fifth connecting pipe.

[0007] The inlet of the condensate circulation pump is provided with a condensate circulation pump front regulating valve and the outlet is provided with a condensate circulation pump rear regulating valve.

[0008] There are four rows of condensate pipes at the bottom of the feeding belt below the feeding belt. The inlets of the four rows of condensate pipes at the bottom of the feeding belt are provided with water inlet three-way valves and the outlets are provided with water outlet three-way valves.

[0009] The longitudinal condensate pipe at the bottom of the silo and the transverse flue gas pipe at the bottom of the silo are arranged vertically and horizontally inside the silo wall at the bottom of the silo.

[0010] The heat exchange fan inlet is provided with a heat exchange fan inlet regulating door and the heat exchange fan outlet regulating door is provided with a heat exchange fan outlet regulating door.

[0011] A tail smoke inlet isolation door is arranged at the front end of the third connecting pipe; and a tail smoke return isolation door is arranged at the rear end of the fifth connecting pipe.

[0012] A condenser inlet door is arranged at the front end of the condenser.

[0013] The feed belt is installed on the feed belt supporting steel frame.

[0014] The beneficial effects of the utility model are as follows: the utility model dries the agricultural and forestry waste carried by the silo and the feeding belt by using the waste heat flue gas to be discharged and the condensate water after condensation in the steam turbine, thereby solving the problem that the load of the biomass unit is difficult to increase due to the high water content of the fuel, and can recycle part of the waste heat of the flue gas and the waste heat of the condensate water, thereby improving the economy of the biomass unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1It is a structural schematic diagram of the utility model;

[0016] Figure 2 This is the piping layout diagram at the bottom of the silo;

[0017] Figure 3 It is a top view of the feeding belt;

[0018] In the figure: 1-steam turbine; 2-condenser; 3-front regulating door of condensate circulating pump; 4-rear regulating door of condensate circulating pump; 5-condensate circulating pump; 6-heat exchanger; 7-first connecting pipe; 8-condensate pipe at the bottom of feeding belt; 9-feeding belt; 10-feeding belt supporting steel frame; 11-longitudinal condensate pipe at the bottom of silo; 12-second connecting pipe; 13-condenser inlet door; 14-boiler; 15-induced draft fan; 16-dust collector; 17-chimney; 18-rear smoke inlet isolation door; 19-third connecting pipe; 20-heat exchange fan inlet regulating door; 21-heat exchange fan; 22-heat exchange fan outlet regulating door; 23-fourth connecting pipe; 24-silo; 25-silo bottom horizontal smoke pipe; 26-fifth connecting pipe; 27-rear smoke return isolation door; 28-silo wall; 29-feeding belt fixing steel frame; 30-water inlet three-way valve; 31-water outlet three-way valve;

[0019] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0020] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer according to the following description. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0021] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0023] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0024] A system that utilizes flue gas waste heat to neutralize condensed water temperature and dry biomass fuel, such as Figures 1 to 3 As shown, it includes a steam turbine 1, a condenser 2, a front regulating gate 3 of a condensate circulation pump, a rear regulating gate 4 of a condensate circulation pump, a condensate circulation pump 5, a heat exchanger 6, a first connecting pipe 7, a condensate pipe 8 at the bottom of a feeding belt, a feeding belt 9, a feeding belt supporting steel frame 10, a longitudinal condensate pipe 11 at the bottom of a silo, a second connecting pipe 12, a condenser inlet door 13, a boiler 14, an induced draft fan 15, a dust collector 16, a chimney 17, a tail flue gas inlet isolation door 18, a third connecting pipe 19, a heat exchange fan inlet regulating gate 20, a heat exchange fan 21, a heat exchange fan outlet regulating gate 22, a fourth connecting pipe 23, a silo 24, a transverse flue gas pipe 25 at the bottom of the silo, a fifth connecting pipe 26, a tail flue gas return isolation door 27, a silo wall 28, a feeding belt fixing steel frame 29, a water inlet three-way valve 30 and a water outlet three-way valve 31.

[0025] A condensate pipe is provided in the heat exchanger 6, the inlet of the condensate pipe in the heat exchanger 6 is connected to the condenser 2 through the condensate circulation pump 5, the outlet of the condensate pipe in the heat exchanger 6 is connected to the condensate pipe 8 at the bottom of the feeding belt through the first connecting pipe 7, the condensate pipe 8 at the bottom of the feeding belt is arranged directly below the feeding belt 9, the feeding belt 9 and the condensate pipe 8 at the bottom of the feeding belt are arranged obliquely, the condensate pipe 8 at the bottom of the feeding belt is connected to the longitudinal condensate pipe 11 at the bottom of the silo, the longitudinal condensate pipe 11 at the bottom of the silo is connected to the condenser 2 through the second connecting pipe 12, and the condenser 2 is connected A steam turbine 1 is provided, a boiler 14 is connected to a chimney 17 through an induced draft fan 15 and a dust collector 16, a third connecting pipe 19 is connected between the induced draft fan 15 and the dust collector 16, the third connecting pipe 19 is connected to the heat source inlet of the heat exchanger 6 through a heat exchange fan 21, the heat source outlet of the heat exchanger 6 is connected to a transverse flue gas pipe 25 at the bottom of the silo through a fourth connecting pipe 23, a longitudinal condensate pipe 11 at the bottom of the silo and a transverse flue gas pipe 25 at the bottom of the silo are arranged vertically and horizontally at the bottom of the silo 24, and the transverse flue gas pipe 25 at the bottom of the silo is connected between the induced draft fan 15 and the dust collector 16 through a fifth connecting pipe 26.

[0026] The inlet of the condensate circulation pump 5 is provided with a condensate circulation pump front regulating valve 3 and the outlet is provided with a condensate circulation pump rear regulating valve 4.

[0027] There are four rows of condensate pipes 8 at the bottom of the feeding belt below the feeding belt 9. The inlets of the four rows of condensate pipes 8 at the bottom of the feeding belt are provided with water inlet three-way valves 30 and the outlets are provided with water outlet three-way valves 31.

[0028] The longitudinal condensate pipe 11 at the bottom of the silo and the transverse flue gas pipe 25 at the bottom of the silo are arranged vertically and horizontally inside the silo wall 28 at the bottom of the silo 24 .

[0029] The inlet of the heat exchange fan 21 is provided with a heat exchange fan inlet regulating door 20 and the outlet is provided with a heat exchange fan outlet regulating door 22 .

[0030] A tail smoke inlet isolating door 18 is provided at the front end of the third connecting pipe 19 ; a tail smoke return isolating door 27 is provided at the rear end of the fifth connecting pipe 26 .

[0031] A condenser inlet door 13 is provided at the front end of the condenser 2 .

[0032] The feeding belt 9 is installed on the feeding belt supporting steel frame 10.

[0033] The heat exchanger 6 is arranged in an independent place. A titanium metal pipe is arranged in the heat exchanger 6 as a condensate pipe. The medium in the titanium metal pipe is condensate. The condenser 2 delivers a part of condensate to the heat exchanger 6 through the condensate circulation pump 5 to exchange heat with the flue gas for heating. The inlet and outlet of the condensate circulation pump 5 are arranged with the condensate circulation pump front regulating valve 3 and the condensate circulation pump rear regulating valve 4. The outside of the titanium metal pipe in the heat exchanger 6 is the waste heat flue gas. The waste heat flue gas is taken from after the induced draft fan 15 and before the dust collector 16. In order to avoid the negative pressure of the boiler 14 from changing significantly due to the operation of the heat exchange fan 21, a part of the flue gas is conveyed to the heat exchanger 6 after being pressurized by the heat exchange fan 21 to heat the condensate. The inlet and outlet of the heat exchange fan 21 are arranged with the heat exchange fan inlet regulating valve 20 and the heat exchange fan outlet regulating valve 22. After heat exchange in the heat exchanger 6, the condensate temperature and the flue gas temperature are neutralized to reach a certain equilibrium value. After heat exchange with the flue gas, the condensate comes out of the heat exchanger 6 and enters the upper end of the condensate pipe 8 at the bottom of the feeding belt below the feeding belt 9. Four rows of condensate pipes 8 at the bottom of the feeding belt are arranged under the feeding belt 9 for drying fuel. The four rows of condensate pipes 8 at the bottom of the feeding belt are connected with a water inlet three-way valve 30 and a water outlet three-way valve 31 at the connection point, which are used to evenly distribute the condensate in the four rows of condensate pipes 8 at the bottom of the feeding belt. Since the feeding belt 9 is tilted, the condensate pipe 8 at the bottom of the feeding belt is also tilted. The condensate naturally flows down to the bottom of the silo 24 in the condensate pipe 8 at the bottom of the feeding belt, which can reduce the output of the condensate circulation pump 5. The condensate passes through the longitudinal condensate pipe 11 at the bottom of the silo 24 to dry and preheat the agricultural and forestry waste stored in the silo 24, and then returns to the condenser 2. After the waste heat flue gas passes through the heat exchanger 6 and equalizes the temperature with the condensed water, it enters the transverse flue gas duct 25 at the bottom of the silo 24 through the fourth connecting pipe 23 to dry and preheat the agricultural and forestry waste stored in the silo 24, and then returns to the rear of the induced draft fan 15.

[0034] The longitudinal condensate pipe 11 at the bottom of the silo and the transverse flue gas pipe 25 at the bottom of the silo are arranged alternately horizontally and vertically at the bottom of the silo 24. A condensate circulation pump rear regulating door 4 is set behind the condensate circulation pump 5 going to the silo 24, and a heat exchange fan outlet regulating door 22 is set behind the heat exchange fan 21 going to the silo 24, which can adjust the waste heat flue gas temperature and condensate temperature entering the silo 24 to achieve the effect of controlling the temperature. The dried condensate of the agricultural and forestry waste in the silo 24 returns to the condenser 2 through the second connecting pipe 12 for reuse, and the dried waste heat flue gas returns to the rear of the induced draft fan 15 through the fifth connecting pipe 26 and enters the dust collector 16, and is discharged through the chimney 17 after a series of operations.

[0035] The system design of the utility model is reasonable and flexible to adjust. By adjusting the heat exchange regulating door of the condensate pipe and the heat exchange regulating door of the waste heat flue gas pipe, the drying degree of the silo 24 can be controlled, which can adapt to the drying effect of agricultural and forestry wastes with different water contents, and has a certain promotion and application prospect;

[0036] The utility model dries the agricultural and forestry waste carried by the silo 24 and the feeding belt 9 by using the waste heat flue gas to be discharged and the condensed water after condensation in the steam turbine 1, thereby solving the problem that the load of the biomass unit is difficult to increase due to the high water content of the fuel. It can recycle part of the waste heat of the flue gas and the waste heat of the condensed water, thereby improving the economy of the biomass unit.

[0037] The utility model is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the utility model, or it is directly applied to other occasions without improvement, it is within the protection scope of the utility model.

Claims

1. A system for utilizing flue gas waste heat to neutralize condensed water temperature and dry biomass fuel, comprising a heat exchanger (6) and a boiler (14), characterized in that: A condensate pipe is provided in the heat exchanger (6). The inlet of the condensate pipe in the heat exchanger (6) is connected to the condenser (2) via a condensate circulation pump (5). The outlet of the condensate pipe in the heat exchanger (6) is connected to the condensate pipe (8) at the bottom of the feeding belt via a first connecting pipe (7). The condensate pipe (8) at the bottom of the feeding belt is arranged directly below the feeding belt (9). The feeding belt (9) and the condensate pipe (8) at the bottom of the feeding belt are arranged obliquely. The condensate pipe (8) at the bottom of the feeding belt is connected to the longitudinal condensate pipe (11) at the bottom of the silo. The longitudinal condensate pipe (11) at the bottom of the silo is connected to the condenser (2) via a second connecting pipe (12). The condenser (2) is connected to a steam turbine. (1), the boiler (14) is connected to a chimney (17) through an induced draft fan (15) and a dust collector (16), a third connecting pipe (19) is connected between the induced draft fan (15) and the dust collector (16), the third connecting pipe (19) is connected to a heat source inlet of a heat exchanger (6) through a heat exchange fan (21), the heat source outlet of the heat exchanger (6) is connected to a transverse flue gas pipe (25) at the bottom of a silo through a fourth connecting pipe (23), a longitudinal condensate pipe (11) at the bottom of a silo and a transverse flue gas pipe (25) at the bottom of a silo are arranged vertically and horizontally at the bottom of a silo (24), and the transverse flue gas pipe (25) at the bottom of a silo is connected between the induced draft fan (15) and the dust collector (16) through a fifth connecting pipe (26).

2. A system for utilizing flue gas waste heat to neutralize condensed water temperature and dry biomass fuel according to claim 1, characterized in that: The inlet of the condensate circulation pump (5) is provided with a condensate circulation pump front regulating valve (3) and the outlet is provided with a condensate circulation pump rear regulating valve (4).

3. A system for utilizing flue gas waste heat to neutralize condensed water temperature and dry biomass fuel according to claim 2, characterized in that: There are four rows of condensate pipes (8) at the bottom of the feeding belt below the feeding belt (9), and the inlets of the four rows of condensate pipes (8) at the bottom of the feeding belt are provided with water inlet three-way valves (30) and the outlets are provided with water outlet three-way valves (31).

4. A system for utilizing flue gas waste heat to neutralize condensed water temperature and dry biomass fuel according to claim 3, characterized in that: The longitudinal condensate pipe (11) at the bottom of the silo and the transverse smoke pipe (25) at the bottom of the silo are arranged vertically and horizontally inside the silo wall (28) at the bottom of the silo (24).

5. A system for utilizing flue gas waste heat to neutralize condensed water temperature and dry biomass fuel according to claim 4, characterized in that: The inlet of the heat exchange fan (21) is provided with a heat exchange fan inlet regulating door (20) and the outlet is provided with a heat exchange fan outlet regulating door (22).

6. A system for utilizing flue gas waste heat to neutralize condensed water temperature and dry biomass fuel according to claim 5, characterized in that: A rear smoke inlet isolation door (18) is provided at the front end of the third connecting pipe (19); and a rear smoke return isolation door (27) is provided at the rear end of the fifth connecting pipe (26).

7. A system for utilizing flue gas waste heat to neutralize condensed water temperature and dry biomass fuel according to claim 6, characterized in that: A condenser inlet door (13) is provided at the front end of the condenser (2).

8. A system for utilizing flue gas waste heat to neutralize condensed water temperature and dry biomass fuel according to claim 7, characterized in that: The feeding belt (9) is installed on a feeding belt supporting steel frame (10) and a feeding belt fixing steel frame (29).

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