High-temperature boiler sludge drying device

Abstract

The utility model discloses a boiler sludge drying device which comprises a wet material bin, a drying machine, a heat exchange device and a dry material bin, the heat exchange device is connected with the drying machine to form a heat circulation channel, a dust removal filtering device is arranged on the drying machine, and the dust removal filtering device is connected with the heat exchange device. The heat exchange device comprises a boiler, a dehumidification heat exchanger, a heat recoverer, a cooling tower, a circulating fan and a waste discharge fan, the boiler is connected with the drying machine, the dehumidification heat exchanger is connected with the dust removal filtering device and the boiler, the heat recoverer is connected with the waste discharge fan and the circulating fan, and the cooling tower is connected with the dehumidification heat exchanger. According to the sludge drying device of the boiler, a large amount of heat is generated through biogas combustion, circulating air is heated and enters the drying machine, sludge is dried, moisture evaporated from the sludge is taken away, moisture removal air can be transmitted to the cooling tower through the dehumidification heat exchanger, and liquid water is condensed; dry air and fresh air subjected to heat recovery are mixed and enter the boiler to be combusted into dry hot air, so that heat circulation is completed, and the drying efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sludge drying, in particular to a high-temperature boiler sludge drying device. Background Art

[0002] In recent years, with the development of sludge drying technology, sludge drying technology has gradually become one of the mainstream technologies for sludge treatment and disposal in my country.

[0003] Sludge drying technology is a treatment technology that circulates the hot dry air generated by the drying system in the system to dry the strip-shaped sludge evenly distributed on the mesh belt. The sludge with a moisture content of 80% can be dried to 20% dry mud after mechanical filtration such as plate and frame filter press, belt filter press and centrifugal dehydrator. This technology can reduce the volume of sludge by nearly one-half, only consumes electricity, does not require other auxiliary energy, has no requirements for the external ambient temperature, and the entire system can maintain high-efficiency movement. The fully intelligent automatic control system integrated by this technology has a good operating environment while improving operating efficiency, and is used to treat various types of sludge generated by sewage treatment plants.

[0004] Heat pump sludge system has gradually become the mainstream of the market, it has the following main features:

[0005] 1. Multi-layer mesh belt, low energy consumption;

[0006] 2. The equipment runs smoothly and the materials are not easily damaged;

[0007] 3. Large processing capacity, drying time can be adjusted at will;

[0008] 4. Continuous drying is possible, saving labor.

[0009] With the continuous development of industrial technology, it is found that low-temperature sludge drying has low efficiency, occupies a large area, some sludge is difficult to evaporate water at low temperature, the heat exchanger is built-in, there is a risk of corrosion and blockage of the air duct, and it is not easy to clean; therefore, there is an urgent need for a highly reliable, energy-saving and environmentally friendly boiler drying device to solve the above problems. Utility Model Content

[0010] The purpose of the utility model is to provide a high-temperature boiler sludge drying device to solve the technical problems of existing sludge drying, such as low efficiency, large floor space, partial mud, difficulty in evaporating water under low temperature conditions, built-in heat exchanger, and risk of corrosion and air duct blockage.

[0011] To achieve the above-mentioned objectives, the utility model provides the following technical solutions: a high-temperature boiler sludge drying device, comprising a wet material bin, a dryer, a heat exchange device and a dry material bin, the discharge pipe of the wet material bin is connected to the dryer, the heat exchange device is connected to the front end and the rear end of the dryer to form a heat circulation channel, the dry material bin is connected to the rear end of the dryer, a dust removal and filtering device is provided above the rear end of the dryer, the air outlet of the dust removal and filtering device is connected to the heat exchange device, the heat exchange device comprises a boiler, a dehumidification heat exchanger, a heat recovery device, a cooling tower, a circulating fan and an exhaust fan, the air outlet of the boiler is connected to the air inlet of the dryer, one end of the dehumidification heat exchanger is connected to the dust removal and filtering device, and the other end is connected to the boiler through the circulating fan, the heat recovery device is respectively connected to the exhaust fan and the circulating fan, and the cooling tower is connected to the dehumidification heat exchanger.

[0012] Preferably, the wet material bin comprises a sludge screw pump and a feed hopper, wherein the feed hopper is arranged above the sludge screw pump, and the sludge is poured into the sludge screw pump and input into the dryer.

[0013] Preferably, the discharge pipe is provided with an electric feed valve.

[0014] Preferably, a biogas input pipeline for biogas to enter is provided on the boiler, and a biogas inlet is provided at the end of the biogas input pipeline.

[0015] Preferably, the dehumidification heat exchanger is provided with a condensate pump.

[0016] Preferably, the heat recovery device is connected to an exhaust fan.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] The utility model discloses a high-temperature boiler sludge drying device, which mainly comprises a wet material bin, a drying machine, a heat exchange device and a dry material bin, wherein the heat exchange device comprises a boiler, a dehumidification heat exchanger, a heat recovery device, a cooling tower and a circulating fan. A large amount of heat is generated through the combustion of biogas in the boiler, so that the circulating air is heated up and enters the interior of the drying machine to dry the sludge and take away the water evaporated from the sludge. During this period, the dehumidified air will flow out of the drying machine, a small part of the dehumidified air will be subjected to dust and deodorization treatment after passing through the heat recovery device, and most of the dehumidified air will pass through the dehumidification heat exchanger to transfer its latent heat part to the cooling tower for cooling water to absorb heat, and condense liquid water at the same time. Finally, the dry air and the fresh air after heat recovery are mixed and enter the boiler to be burned as dry hot air, thereby completing the heat cycle, greatly improving the drying efficiency, and also having the characteristics of energy saving and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0020] Figure 1 This is a three-dimensional structural schematic diagram of a high-temperature boiler sludge drying device of the utility model;

[0021] Figure 2 It is a schematic diagram of the main structure of a high-temperature boiler sludge drying device of the utility model.

[0022] Explanation of the reference numerals: 1. Wet material bin; 10. Discharge pipe; 11. Sludge screw pump; 12. Feed hopper; 13. Feed electric valve; 2. Dryer; 3. Heat exchange device; 31. Boiler; 311. Biogas input pipeline; 312. Biogas inlet; 32. Dehumidification heat exchanger; 321. Condensate pump; 33. Heat recovery device; 34. Cooling tower; 35. Circulation fan; 36. Exhaust fan; 4. Dry material bin; 5. Dust removal and filtration device. DETAILED DESCRIPTION

[0023] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0024] See also Figure 1-2 The utility model provides a technical solution: a high-temperature boiler sludge drying device, comprising a wet material bin 1, a dryer 2, a heat exchange device 3 and a dry material bin 4, the discharge pipe 10 of the wet material bin 1 is connected to the dryer 2, the heat exchange device 3 is connected to the front end and the rear end of the dryer 2 to form a heat circulation channel, the dry material bin 4 is connected to the rear end of the dryer 2, a dust removal and filtering device 5 is provided above the rear end of the dryer 2, and the air outlet of the dust removal and filtering device 5 is connected to the heat exchange device 3, the heat exchange device 3 comprises a boiler 31, a dehumidification heat exchanger 32, a heat recovery device 33, a cooling tower 34, a circulating fan 35 and an exhaust fan 36, the air outlet of the boiler 31 is connected to the air inlet of the dryer 2, one end of the dehumidification heat exchanger 32 is connected to the dust removal and filtering device 5, and the other end is connected to the boiler 31 through the circulating fan 35, the heat recovery device 33 is respectively connected to the exhaust fan 36 and the circulating fan 35, and the cooling tower 34 is connected to the dehumidification heat exchanger 32.

[0025] The high-temperature boiler sludge drying device of the utility model adopts a boiler with a large heating capacity, which is used in conjunction with a burner and a combustion-supporting fan. A large amount of heat is generated through combustion of gas or biogas, which heats up the circulating air, thereby achieving the effect of drying the sludge. It mainly includes a wet silo 1, a dryer 2, a heat exchange device 3 and a dry silo 4, wherein the wet silo 1 is used to transport the sludge to the dryer 2, the dryer 2 is used to dry the sludge, the heat exchange device 3 is connected to both ends of the dryer 2 to provide a thermal circulation environment for the dryer 2, and the dry silo 4 is connected to the rear end of the dryer 2 to transport the dried sludge out of the device for storage; specifically, the heat exchange device 3 includes a boiler 31, a dehumidification heat exchanger 32, a heat recovery device 33, a cooling tower 34, a circulating fan 35 and an exhaust fan 36. The boiler 31 burns to release high-temperature flue gas that mixes with the circulating gas and is conducted to form hot air of 110-130°C; the dehumidification heat exchanger 32 absorbs the heat of the return air, reduces the enthalpy of the return air to below the dew point, and condenses the moisture; the heat recovery device 34 is used to heat the return air, and the heat recovery device 35 is used to heat the return air, and the heat recovery device 36 is used to heat the return air, and the heat recovery device 34 is used to heat the return air, and the heat recovery device 35 ... 33 is used to fully exchange heat between a part of the high-temperature and high-humidity return air and the fresh air, and then discharge it to the deodorization system. The heated fresh air enters the burner of the boiler for combustion-supporting combustion; the cooling tower 34 discharges the excess heat of the heat exchange device to the dryer to control the dynamic balance of energy; the circulating fan 35 blows the fresh air generated by the heat cycle into the boiler 31 for combustion, so that the sludge drying device forms a heat cycle and improves the drying efficiency of the drying device; the dust removal and filtering device 5 is used to isolate the dust from entering the dehumidification heat exchanger 32 to ensure the safety and stability of the device. Through the pressure difference feedback, the pulse valve is automatically adjusted to back-purge and clean the dust removal bag; the exhaust fan 36 is used to fully exchange heat between a small part of the high-temperature and high-humidity return air and the fresh air, and the dehumidified air is subjected to dust removal and deodorization treatment after passing through the heat recovery device.

[0026] The device also includes a waste gas treatment device to avoid long-term operation and accumulation of gas concentration. It can extract part of the gas to the waste gas treatment station at a fixed time or according to the concentration; it also includes an intelligent control system to automatically adjust the temperature, humidity and drying time according to the optimal drying process. Since the specific structures of the above-mentioned dryer 2, boiler 31, dehumidification heat exchanger 32, heat recovery device 33, cooling tower 34, circulation fan 35 and exhaust fan 36 are the same as the existing structures, there is no need to further elaborate on their specific internal structures and characteristics.

[0027] In a preferred embodiment, referring to Figure 1 and 2The wet material bin 1 of the high-temperature boiler drying sludge device includes a sludge screw pump 11 and a feed hopper 12. The feed hopper 12 is arranged above the sludge screw pump 11, and the sludge is poured into the sludge screw pump 11 and input into the dryer 2. A feed electric valve 13 is arranged on the discharge pipe 10. The feed hopper 12 is an inverted trapezoidal structure. The sludge enters the sludge screw pump 11 from the feed hopper 12, and then the sludge is transported to the inside of the dryer 2 through the sludge screw pump 11. The sludge screw pump 11 is connected to the dryer 2 through the discharge pipe 10. The feed electric valve 13 is arranged on the discharge pipe 10 to control the opening or closing of the sludge transportation.

[0028] In a preferred embodiment, referring to Figure 1 The boiler of the high-temperature boiler drying sludge device is provided with a biogas input pipeline 311 for biogas to enter, and a biogas inlet 312 is provided at the end of the biogas input pipeline 311. The biogas inlet 312 is connected to an external biogas storage device, so that the biogas is transported to the boiler 31 through the input pipeline 311 to burn and form high-temperature flue gas.

[0029] In a preferred embodiment, referring to Figure 1 and Figure 2 The dehumidification heat exchanger 32 of the high-temperature boiler drying sludge device is provided with a condensation water pump 321. The condensation water pump 321 is installed on the outlet pipe of the dehumidification heat exchanger 32, and is used to control the outflow of liquid water condensed by the dehumidification heat exchanger, so as to further cool and dehumidify the air.

[0030] The working principle of the high-temperature boiler drying sludge device of the utility model is:

[0031] According to the different drying process sections, the high-temperature air flow is allocated to the regional mesh belt in the dryer 2 through the biogas boiler 31. The hot air flow passes through the mesh belt to dry the sludge and take away the water evaporated from the sludge. The internal circumferential circulation and serpentine circulation of the dryer 2 strengthen the contact heat exchange, so that the dehumidified air flows out of the dryer. The exhaust fan 36 can pass a small part of the dehumidified air through the heat recovery device 33 for dust removal and deodorization. Most of it passes through the dehumidification heat exchanger 32 to transfer its latent heat to the cooling tower 34 for cooling water to absorb heat, and condense liquid water at the same time; the water cooler on the dehumidification heat exchanger 32 further cools and dehumidifies the air, so that the dry air and the fresh air after heat recovery are mixed and enter the boiler 31 to burn into dry hot air, thereby completing the heat cycle. The cycle steps are: continuous heating-evaporation-condensation-heating cycle. The cooling tower 34, the heat recovery device 33, and the boiler 31 loop are responsible for the dynamic balance of heat supply and flow, so that the drying environment of the drying host remains consistent and efficient. The boiler of the present application is a device that obtains heat energy from fuel gas and biogas, and after safe combustion, provides high-quality heat energy that can be used by people. The high-temperature boiler drying sludge drying technology of the present application adopts high-temperature combustion to produce flue gas of 300-500°C. After mixing with circulating air, the temperature can reach 150°C, and the drying temperature is 90°C-110°C, which is higher than the existing conventional heat pump drying, and the drying efficiency is improved. All parts of the high-temperature boiler dryer, most of the air duct devices and water duct devices are outside the dryer main machine, isolated from the mud, water, and dust materials related to the sludge, and are easy to clean, reliable to use, energy-saving and environmentally friendly.

[0032] The high temperature boiler drying sludge device of the present application also has the following characteristics:

[0033] (1) High heating capacity. The heat generated by the complete combustion of gas and biogas is used to dry the sludge. The combustion heat is almost 100% utilized, and the high temperature greatly improves the drying efficiency.

[0034] (2) The cooling tower is highly efficient. The return air temperature is high and the wet bulb temperature of the cooling tower is low, resulting in a large temperature difference. The cooling tower has a high efficiency and the cooling capacity / heat can be easily adjusted within a wide range.

[0035] (3) The burner, combustion-supporting fan, control cabinet, valve group and other components of the high-temperature boiler are arranged outside the drying host, and are not in contact with the dust, corrosive gas, droplets, etc. generated by the sludge. The reliability and durability are greatly improved, and the maintenance work intensity is also reduced.

[0036] (4) High temperature heating creates a mild and safe drying environment. The sludge is heated to 90℃-110℃, which is in the pasteurization condition and can effectively kill bacteria.

[0037] (6) The COD of condensed water is less than 200 mg / L, which is close to that of reclaimed water in some cases, and the sewage treatment load is low.

[0038] (7) The hot air in the drying main unit circulates efficiently, with both layer circulation in the cross section of the box and serpentine deflection in the length direction of the box. The transfer of air heat to the sludge is enhanced, and the evaporation and discharge of water are promoted.

[0039] (8) The dehumidification and heat exchange system does not come into contact with dust, is durable, and has an extremely low heat exchange efficiency attenuation rate.

[0040] (9) Belt drying, the speed of the conveyor belt is continuously adjustable, and it can be semi-dried or fully dried according to the process requirements. The low-speed moving parts such as bearings and mesh chains are simple and easy to control, and the bearings, tensioners, and reduction motors are placed outside the main engine box, which is easy to maintain and cost-effective.

[0041] (10) Full-path insulation: The main shell of the dryer is made of rock wool or polyurethane foam with a thickness of more than 100 mm. The air duct and fan duct are wrapped with materials with the same thermal insulation performance and tightly sealed to prevent hot spots. The hot water circulation pipeline and the water pipeline between the indirect heat exchanger and the evaporator are all wrapped with high-quality thickened thermal insulation sponge materials, without any leaks in the entire section.

[0042] (11) The main unit has a simple structure and is modular. There is ample space for hot air to flow inside, and there is no local dead zone where combustible gas and rancid gas accumulate, and there is no risk of dust explosion.

[0043] (12) A dust cleaning spiral can be configured to further reduce the workload of daily cleaning and maintenance.

[0044] (13) Online temperature detection, pressure detection, flow detection, water level detection, dust concentration detection at key nodes, and other parameter detection can also be configured. The monitoring data is summarized in the system main control or sub-control, and the electrical control system intelligently and automatically takes control instructions to ensure that the entire drying system is in a safe and stable operation state.

[0045] (14) A heat recovery heat exchanger can be configured in the circulation path outside the dryer to further absorb the waste heat from dehumidification, reduce the operating load, and improve the drying energy efficiency.

[0046] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A high-temperature boiler sludge drying device, characterized in that: It includes a wet material bin, a dryer, a heat exchange device and a dry material bin, the discharge pipe of the wet material bin is connected to the dryer, the heat exchange device is connected to the front end and the rear end of the dryer to form a heat circulation channel, the dry material bin is connected to the rear end of the dryer, a dust removal and filtering device is provided above the rear end of the dryer, the air outlet of the dust removal and filtering device is connected to the heat exchange device, the heat exchange device includes a boiler, a dehumidification heat exchanger, a heat recovery device, a cooling tower, a circulating fan and an exhaust fan, the air outlet of the boiler is connected to the air inlet of the dryer, one end of the dehumidification heat exchanger is connected to the dust removal and filtering device, and the other end is connected to the boiler through the circulating fan, the heat recovery device is respectively connected to the exhaust fan and the circulating fan, and the cooling tower is connected to the dehumidification heat exchanger.

2. The high temperature boiler sludge drying device according to claim 1 is characterized in that: The wet material bin comprises a sludge screw pump and a feed hopper. The feed hopper is arranged above the sludge screw pump, and the sludge is poured into the sludge screw pump and input into the dryer.

3. The high temperature boiler sludge drying device according to claim 1 is characterized in that: The discharge pipe is provided with a feed electric valve.

4. The high temperature boiler sludge drying device according to claim 1 is characterized in that: The boiler is provided with a biogas input pipeline for biogas to enter, and a biogas inlet is provided at the end of the biogas input pipeline.

5. The high temperature boiler sludge drying device according to claim 1 is characterized in that: The dehumidification heat exchanger is provided with a condensation water pump.

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