Furfural residue utilization system

Abstract

The utility model discloses a furfural residue utilization system which comprises a hydrolysis kettle, a residue storage warehouse, a stokehole stock bin, a drying flue, a crusher, a vibrating screen, a furnace top gas-residue cyclone separator, a boiler, a bag-type dust collector, an air preheater, an induced draft fan, a desulfurizing tower, a demister, a denitration device and a chimney, a slag discharging opening of the hydrolysis kettle is communicated with an inlet of the slag storage warehouse, a discharging opening of the slag storage warehouse is communicated with a feeding opening of the stokehole stock bin, a discharging opening of the stokehole stock bin is communicated with a feeding opening of the spiral conveyor, a discharging opening of the spiral conveyor is communicated with a feeding opening of the drying flue, and a discharging opening of the drying flue is communicated with a feeding opening of the crusher. A discharging port of the crusher is communicated with a feeding port of the vibrating screen, an undersize product outlet of the vibrating screen is communicated with a feeding port of the furnace top gas-slag cyclone separator, and a discharging port of the feeding port of the furnace top gas-slag cyclone separator is communicated with a fuel inlet of the boiler. According to the furfural residue recycling device, furfural residues can be efficiently treated, resource utilization of the furfural residues is achieved, and the combustion efficiency of the boiler is guaranteed.

Description

Technical fields:

[0001] This utility model relates to the field of furfural residue treatment technology, and in particular to a furfural residue utilization system. Background technology:

[0002] In the process of preparing furfural from corn cobs, the corn cobs are acidically hydrolyzed to obtain a hydrolysate. This hydrolysate is then purified through distillation and deacidification to produce furfural. During hydrolysis, a large amount of furfural residue is generated as a byproduct. Its main components are cellulose, hemicellulose, lignin, and residual furfural and sulfides. If left untreated and discarded as waste, it not only occupies a significant amount of land, but the organic components in the residue are also prone to decay and degradation in the natural environment, releasing harmful gases and polluting the surrounding atmosphere. Furthermore, rainwater runoff from the residue may cause acidic substances and heavy metals to enter the soil and water bodies, damaging soil structure, affecting soil fertility, and causing water pollution, posing a serious threat to the ecological balance.

[0003] Currently, enterprises typically use furfural residue directly as fuel in boilers. However, furfural residue has a high moisture content, approximately 50%, which requires a significant amount of additional energy to evaporate the moisture during combustion. This results in low combustion efficiency, failing to fully release its potential energy value and causing substantial energy waste. Furthermore, due to the poor combustion characteristics of furfural residue and its unstable combustion process, complete combustion is difficult to achieve, producing large amounts of smoke, particulate matter, and harmful gases such as sulfur dioxide and nitrogen oxides. The emission concentrations of these pollutants often far exceed national environmental standards, imposing a heavy burden on the environment and subjecting enterprises to hefty environmental fines and rectification pressures. Utility model content:

[0004] In order to solve the above problems, the purpose of this utility model is to provide a furfural residue utilization system.

[0005] This utility model is implemented by the following technical solution:

[0006] A furfural residue utilization system includes a hydrolysis reactor, a residue storage silo, a furnace front silo, a drying flue, a crusher, a vibrating screen, a furnace top gas-slag cyclone separator, a boiler, a bag filter, an air preheater, an induced draft fan, a desulfurization tower, a demister, a denitrification device, and a chimney.

[0007] The slag discharge port of the hydrolysis reactor is connected to the inlet of the slag storage tank; the discharge port of the slag storage tank is connected to the inlet of the furnace front silo; the discharge port of the furnace front silo is connected to the inlet of the screw conveyor; the discharge port of the screw conveyor is connected to the inlet of the drying flue; the discharge port of the drying flue is connected to the inlet of the crusher; the discharge port of the crusher is connected to the inlet of the vibrating screen; the outlet of the undersize material of the vibrating screen is connected to the inlet of the furnace top gas-slag cyclone separator; and the discharge port of the furnace top gas-slag cyclone separator is connected to the fuel inlet of the boiler.

[0008] The flue gas outlet of the boiler is connected to the air inlet of the drying flue, the air outlet of the drying flue is connected to the air inlet of the bag filter, the air outlet of the bag filter is connected to the heat medium inlet of the air preheater, the heat medium outlet of the air preheater is connected to the inlet of the induced draft fan, the outlet of the induced draft fan is connected to the air inlet of the desulfurization tower, the air outlet of the desulfurization tower is connected to the air inlet of the demister, the air outlet of the demister is connected to the air inlet of the denitrification device, and the air outlet of the denitrification device is connected to the air inlet of the chimney.

[0009] Furthermore, the blower's air inlet is connected to the atmosphere, the blower's air outlet is connected to the cold medium inlet of the air preheater, and the air preheater's cold medium outlet is connected to the boiler's combustion air inlet.

[0010] Furthermore, a nitrogen oxide concentration monitoring sensor is installed at the flue gas outlet of the denitrification device, and a flow regulating valve is installed at the ammonia inlet of the denitrification device. The signal output terminal of the nitrogen oxide concentration monitoring sensor is connected to the signal input terminal of the controller, and the signal output terminal of the controller is connected to the signal input terminal of the flow regulating valve.

[0011] Furthermore, an oxygen concentration sensor is installed inside the furnace of the boiler. The signal output terminal of the oxygen concentration sensor is connected to the signal input terminal of the controller, and the signal output terminal of the controller is connected to the signal input terminal of the blower motor.

[0012] Advantages of this utility model:

[0013] By convecting the high-temperature flue gas generated from the combustion of furfural residue with the furfural residue produced by hydrolysis within the drying flue, the moisture in the furfural residue is continuously evaporated, thereby reducing its moisture content and improving the combustion efficiency in the boiler. The high-temperature flue gas then enters the air preheater as a heat medium, using its preheating properties to preheat the combustion air entering the boiler, further reducing the flue gas temperature and simultaneously increasing the combustion air temperature, thus further improving the boiler's combustion efficiency. A nitrogen oxide concentration monitoring sensor installed at the outlet of the denitrification device can monitor the denitrification effect in real time, allowing for timely adjustment of the ammonia injection rate via a flow regulating valve, ultimately ensuring that all pollutant indicators in the treated flue gas meet emission standards. An oxygen concentration sensor can detect the oxygen concentration in the furnace in real time, and the blower motor's operating frequency can be adjusted to regulate the airflow, ensuring complete combustion of the furfural residue in the furnace.

[0014] This invention can efficiently process furfural residue, realize the resource utilization of furfural residue, improve energy utilization efficiency, reduce environmental pollution, and ensure boiler combustion efficiency. Attached image description:

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the system connection in this embodiment;

[0017] Figure 2 This is a control principle diagram for this embodiment.

[0018] In the diagram: 1. Hydrolysis reactor; 2. Slag storage bin; 3. Furnace front silo; 4. Drying flue; 5. Crusher; 6. Vibrating screen; 7. Furnace top gas-slag cyclone separator; 8. Boiler; 9. Bag filter; 10. Air preheater; 11. Exhaust fan; 12. Desulfurization tower; 13. Demister; 14. Denitrification device; 15. Chimney; 16. Blower; 17. Nitrogen oxide concentration monitoring sensor; 18. Flow regulating valve; 19. Controller; 20. Oxygen concentration sensor; 21. Screw conveyor. Detailed implementation method:

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example 1:

[0021] like Figure 1 , 2 The furfural residue utilization system shown includes a hydrolysis reactor 1, a residue storage silo 2, a furnace front silo 3, a drying flue 4, a crusher 5, a vibrating screen 6, a furnace top gas-slag cyclone separator 7, a boiler 8, a bag filter 9, an air preheater 10, an induced draft fan 11, a desulfurization tower 12, a demister 13, a denitrification device 14, and a chimney 15.

[0022] The slag discharge port of hydrolysis reactor 1 is connected to the inlet of slag storage silo 2, the discharge port of slag storage silo 2 is connected to the inlet of furnace front silo 3, the discharge port of furnace front silo 3 is connected to the inlet of 21, the discharge port of screw conveyor 21 is connected to the inlet of drying flue 4, the discharge port of drying flue 4 is connected to the inlet of crusher 5, the discharge port of crusher 5 is connected to the inlet of vibrating screen 6, the undersize outlet of vibrating screen 6 is connected to the inlet of furnace top gas slag cyclone separator 7, and the discharge port of furnace top gas slag cyclone separator 7 is connected to the fuel inlet of boiler 8.

[0023] The flue gas outlet of boiler 8 is connected to the air inlet of drying flue 4. The air outlet of drying flue 4 is connected to the air inlet of bag filter 9. The air outlet of bag filter 9 is connected to the heat medium inlet of air preheater 10. The heat medium outlet of air preheater 10 is connected to the inlet of induced draft fan 11. The outlet of induced draft fan 11 is connected to the air inlet of desulfurization tower 12. The air outlet of desulfurization tower 12 is connected to the air inlet of demister 13. The air outlet of demister 13 is connected to the air inlet of denitrification device 14. The air outlet of denitrification device 14 is connected to the air inlet of chimney 15.

[0024] The air inlet of blower 16 is open to the atmosphere, the air outlet of blower 16 is connected to the cold medium inlet of air preheater 10, and the cold medium outlet of air preheater 10 is connected to the combustion air inlet of boiler 8.

[0025] In this embodiment, a nitrogen oxide concentration monitoring sensor 17 is provided at the flue gas outlet of the denitrification device 14, and a flow regulating valve 18 is provided at the ammonia inlet of the denitrification device 14; an oxygen concentration sensor 20 is provided in the furnace of the boiler 8.

[0026] The signal output terminals of nitrogen oxide concentration monitoring sensor 17 and oxygen concentration sensor 20 are both connected to the signal input terminal of controller 19. The signal output terminal of controller 19 is connected to the signal input terminal of flow regulating valve 18 and blower motor 16, respectively.

[0027] Job Description:

[0028] After the hydrolysis process is completed, the pressure in the hydrolysis reactor 1 is reduced to 0.3 MPa to begin slag discharge, which then enters the furfural residue utilization system. Specifically, the furfural residue discharged from the hydrolysis reactor 1 first enters a sealed slag storage silo 2. The furfural residue in the slag storage silo 2 is then conveyed to the furnace front silo 3 via a dedicated conveyor belt. From there, the furfural residue is fed into the drying flue 4 by a slag-feeding screw conveyor 21 at the bottom of the furnace front silo 3. In the drying flue 4, the furfural residue convects with the high-temperature flue gas discharged from the boiler 8, ensuring full contact between the furfural residue and the high-temperature flue gas. Heat transfer causes the moisture in the furfural residue to evaporate continuously, thus reducing its moisture content. After drying, the furfural residue is crushed by a crusher 5 to break up any agglomerated residue. The crushed material enters a vibrating screen 6, and the undersize material is sent to a furnace top gas-slag cyclone separator 7, allowing the dried furfural residue to enter the furnace for combustion.

[0029] The proposed project involves installing two boilers 8 (saturated steam pressure 1.6MPa, temperature 201.4℃, 1 in operation and 1 on standby) in the boiler room. These boilers 8 are dedicated to burning furfural residue. The initial ignition fuel for boilers 8 is wood. The wood is evenly spread on the grate and then ignited. After the combustion is vigorous, the induced draft fan 11 is started to begin feeding furfural residue. Once the combustion fills the furnace, the blower 16 is started to gradually increase the air intake. The resulting high-temperature flue gas undergoes heat exchange on the various heating surfaces of boiler 8, and then enters the bag filter 9 for dust removal. The temperature gradually decreases, and the flue gas then enters the air preheater 10 as a heat medium. The preheating carried by the air preheater further preheats the combustion air entering boiler 8, further reducing the temperature of the flue gas. The induced draft fan 11 then extracts the flue gas into the desulfurization tower 12, where limestone slurry is sprayed down from the top of the tower, making full contact with the flue gas flowing upwards. During this process, sulfur dioxide in the flue gas reacts chemically with limestone slurry to produce calcium sulfite. The desulfurized flue gas passes through demister 13 to remove the carried droplets, and then enters denitrification device 14. Under the action of a catalyst, ammonia is injected into the flue gas as a reducing agent. The ammonia reacts with nitrogen oxides in the flue gas to produce nitrogen and water, thereby reducing the nitrogen oxide content in the flue gas. Afterward, it is discharged into the atmosphere through chimney 15.

[0030] In this embodiment, the nitrogen oxide concentration monitoring sensor 17 installed at the outlet of the denitrification device 14 can monitor the denitrification effect in real time, so as to adjust the ammonia injection rate in a timely manner through the flow regulating valve 18, ultimately ensuring that all pollutant indicators of the treated flue gas meet the emission standards. The oxygen concentration sensor 20 can detect the oxygen concentration in the furnace in real time, and the blower volume can be adjusted by regulating the working frequency of the blower motor 16 to ensure that the furfural residue in the furnace can be fully burned.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A furfural residue utilization system, characterized in that, It includes hydrolysis kettle, slag storage silo, furnace front silo, drying flue, crusher, vibrating screen, furnace top gas-slag cyclone separator, boiler, bag filter, air preheater, induced draft fan, desulfurization tower, demister, denitrification device and chimney; The slag discharge port of the hydrolysis reactor is connected to the inlet of the slag storage tank; the discharge port of the slag storage tank is connected to the inlet of the furnace front silo; the discharge port of the furnace front silo is connected to the inlet of the screw conveyor; the discharge port of the screw conveyor is connected to the inlet of the drying flue; the discharge port of the drying flue is connected to the inlet of the crusher; the discharge port of the crusher is connected to the inlet of the vibrating screen; the outlet of the undersize material of the vibrating screen is connected to the inlet of the furnace top gas-slag cyclone separator; and the discharge port of the furnace top gas-slag cyclone separator is connected to the fuel inlet of the boiler. The flue gas outlet of the boiler is connected to the air inlet of the drying flue, the air outlet of the drying flue is connected to the air inlet of the bag filter, the air outlet of the bag filter is connected to the heat medium inlet of the air preheater, the heat medium outlet of the air preheater is connected to the inlet of the induced draft fan, the outlet of the induced draft fan is connected to the air inlet of the desulfurization tower, the air outlet of the desulfurization tower is connected to the air inlet of the demister, the air outlet of the demister is connected to the air inlet of the denitrification device, and the air outlet of the denitrification device is connected to the air inlet of the chimney.

2. The furfural residue utilization system according to claim 1, characterized in that, The blower's air inlet is open to the atmosphere, the blower's air outlet is connected to the cold medium inlet of the air preheater, and the air preheater's cold medium outlet is connected to the boiler's combustion air inlet.

3. The furfural residue utilization system according to claim 1, characterized in that, A nitrogen oxide concentration monitoring sensor is installed at the flue gas outlet of the denitrification device, and a flow regulating valve is installed at the ammonia inlet of the denitrification device. The signal output terminal of the nitrogen oxide concentration monitoring sensor is connected to the signal input terminal of the controller, and the signal output terminal of the controller is connected to the signal input terminal of the flow regulating valve.

4. A furfural residue utilization system according to claim 2, characterized in that, An oxygen concentration sensor is installed inside the furnace of the boiler. The signal output terminal of the oxygen concentration sensor is connected to the signal input terminal of the controller, and the signal output terminal of the controller is connected to the signal input terminal of the blower motor.

Images