Steam heat exchange sludge drying device

Abstract

The utility model discloses a steam heat exchange 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, and the heat exchange device comprises a steam heat exchanger, a dehumidification heat exchanger, a dehumidification fan, a heat recoverer, a cooling tower, a spray tower and a circulating fan. The steam heat exchanger is connected with the drying machine, the dehumidification heat exchanger and the heat recoverer, the dehumidification heat exchanger is connected with the steam heat exchanger, the heat recoverer is connected with the dehumidification fan, the spray tower and the circulating fan, and the cooling tower is connected with the dehumidification heat exchanger. According to the steam heat exchange sludge drying device disclosed by the utility model, steam exchanges heat in the heat exchanger in a crossed manner to generate heat, so that circulating air is heated and enters the drying machine to dry sludge and take away moisture evaporated from the sludge, and moisture removal air can be converted into condensed water to flow out of the drying machine; 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 steam heat exchange 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 sludge drying using electricity as the main energy source has low efficiency, occupies a large area, and some mud is difficult to evaporate into water at low temperatures. The heat exchanger is built-in, which has the risk of corrosion and blockage of the air duct, and is not easy to clean. Therefore, a boiler drying device with high reliability, energy saving and environmental protection is urgently needed to solve the above problems. Utility Model Content

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

[0011] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a steam heat exchange 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, the heat exchange device comprises a steam heat exchanger, a dehumidification heat exchanger, a dehumidification fan, a heat recovery device, a cooling tower, a spray tower and a circulating fan, the air outlet of the steam heat exchanger is connected to the air inlet of the dryer, the air outlet of the dryer is connected to the dehumidification heat exchanger and the heat recovery device, the rear end of the dehumidification heat exchanger is connected to the steam heat exchanger through the circulating fan, the heat recovery device is respectively connected to the dehumidification fan, the spray tower 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, the steam heat exchanger is provided with a steam input pipe for steam to enter, and a condensate water pipe for condensate to flow out. A steam inlet is provided at the end of the steam input pipe, and a condensate water outlet is provided at the end of the condensate water pipe.

[0015] Preferably, a condensate pump is provided on the water outlet pipe of the dehumidification heat exchanger.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The utility model discloses a steam heat exchange drying sludge 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 steam heat exchanger, a dehumidification heat exchanger, a dehumidification fan, a heat recovery device, a cooling tower, a spray tower and a circulating fan. The steam cross-exchanges heat in the heat exchanger to generate a large amount of heat, 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 pass through the heat recovery device and then enter the spray tower for dust removal. Most of the high-humidity return air will pass through the dehumidification heat exchanger to transfer its latent heat to the cooling tower for cooling, and condense liquid water at the same time. Finally, under the action of the circulating fan, the dry air and the fresh air after heat recovery are mixed and enter the steam heat exchanger to cross-exchange heat with the steam to become 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

[0018] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0019] Figure 1 This is a three-dimensional structural schematic diagram of a steam heat exchange sludge drying device of the utility model;

[0020] Figure 2 This is a schematic diagram of the main structure of a steam heat exchange sludge drying device of the utility model.

[0021] 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. Steam heat exchanger; 311. Steam input pipeline; 312. Condensate pipeline; 313. Steam inlet; 314. Condensate outlet; 32. Dehumidification heat exchanger; 321. Condensate pump; 33. Dehumidification fan; 34. Heat recovery device; 35. Cooling tower; 36. Spray tower; 37. Circulation fan; 4. Dry material bin. DETAILED DESCRIPTION

[0022] 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.

[0023] See also Figure 1-2 The utility model provides a technical solution: a steam heat exchange 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 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, the heat exchange device 3 comprises a steam heat exchanger 31, a dehumidification heat exchanger 32, a dehumidification fan 33, a heat recovery device 34, a cooling tower 35, a spray tower 36 and a circulating fan 37, the air outlet of the steam heat exchanger 31 is connected to the air inlet of the dryer 2, the air outlet of the dryer 2 is connected to the dehumidification heat exchanger 32 and the heat recovery device 34, the rear end of the dehumidification heat exchanger 32 is connected to the steam heat exchanger 31 through the circulating fan 37, the heat recovery device 34 is respectively connected to the dehumidification fan 33, the spray tower 36 and the circulating fan 37, and the cooling tower 35 is connected to the dehumidification heat exchanger 32.

[0024] The steam heat exchange sludge drying device of the utility model uses excess steam or low-grade steam from the factory and cooperates with the steam heat exchanger 31 to make the steam cross-exchange heat in the heat exchanger, generate a large amount of heat, and heat up the circulating air, thereby achieving the effect of drying the sludge. It mainly includes a wet bin 1, a dryer 2, a heat exchange device 3 and a dry bin 4, wherein the wet bin 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 bin 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 steam heat exchanger 31, a dehumidification heat exchanger 32, a dehumidification fan 33, a heat recovery device 34, a cooling tower 35, a spray tower 36 and a circulating fan 37. The steam in the steam heat exchanger 31 generates and releases the condensation latent heat in the heat exchanger, which is exchanged with the circulating air and conducted to form 90°C dry hot air; the dehumidification heat exchanger 32 absorbs the high-temperature return heat, reduces the enthalpy of the return air to below the dew point, and the water The dehumidified air is condensed and precipitated out; the dehumidification fan 33 connected to the heat recovery device 34 fully exchanges heat with a part of the high-temperature and high-humidity return air with the fresh air, and then discharges it to the spray tower 36. The heated fresh air enters the circulation fan 37 and enters the steam heat exchanger 31 for heat exchange and heating; the cooling tower 35 discharges the excess heat of the system out of the dryer 2, controls the dynamic balance of energy, and the energy balance of evaporation and condensation; the spray tower 36 is used to reduce the accumulation of odorous, corrosive, and fine dusty waste gas inside the dryer 2. Part of it can be extracted at a fixed time or according to the concentration to ensure the safety and stability of the device. Through the feedback of gas concentration and pressure difference, the valve opening and spraying are automatically adjusted to remove and clean the waste gas; 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, steam heat exchanger 31, dehumidification heat exchanger 32, dehumidification fan 33, heat recovery device 34, cooling tower 35, spray tower 36 and circulating fan 37 are the same as the existing structures, there is no need to further elaborate on their specific internal structures and characteristics.

[0025] In a preferred embodiment, referring to Figure 1 and 2 The 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.

[0026] In a preferred embodiment, referring to Figure 1 The steam heat exchanger 31 of the steam heat exchange drying sludge device is provided with a steam input pipe 311 for steam to enter, and a condensed water pipe 312 for condensed water to flow out. A steam inlet 313 is provided at the end of the steam input pipe, and a condensed water outlet 314 is provided at the end of the condensed water pipe. The steam inlet 313 at the end of the steam input pipe 311 is connected to an external boiler so that excess boiler steam enters the dryer 2. The condensed water pipe 312 is used to guide the condensed liquid water out to ensure that the circulating air in the device is always kept as dry hot air.

[0027] In a preferred embodiment, referring to Figure 1 and Figure 2 The outlet pipe of the dehumidification heat exchanger 32 of the steam heat exchange 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 32, so as to further cool and dehumidify the air.

[0028] The working principle of the steam heat exchange drying sludge device of the utility model is:

[0029] 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 steam heat exchanger 31. The hot air flow passes through the mesh belt, dries the sludge, and takes away the water evaporated from the sludge. The internal circulation and serpentine circulation of the dryer 2 strengthen the contact heat exchange, so that the dehumidified air flows out of the dryer. The dehumidification fan 33 can pass a small part of the dehumidified air through the heat recovery device 34 and then enter the spray tower 36 for dust removal. Most of the high-humidity return air passes through the dehumidification heat exchanger 32, and its latent heat is transferred to the cooling tower 34 for cooling, so as to reduce the enthalpy value to below the dew point and condense liquid water at the same time. Under the action of the rear-end circulation fan 37, the dry air and the fresh air after heat recovery are mixed and enter the steam heat exchanger 31 to cross-exchange heat with the steam to become dry hot air, thereby completing the heat cycle. The cycle steps are: continuous heating-evaporation-condensation-heating cycle. The dehumidification heat exchanger 32, the heat recovery device 33, and the steam heat exchanger 31 are responsible for the dynamic balance of heat supply and flow, so that the drying environment of the drying host remains consistent and efficient.

[0030] The steam heat exchange drying sludge technology of the present application uses the steam from the existing heat exchange station of the factory, and after cross-exchanging heat in the steam heat exchanger 31 to generate 90°C circulating air, it enters the dryer 2 box to dry the sludge on the mesh belt inside the dryer. All parts of the device, most of the air path device and water path device are outside the dryer main machine, isolated from the mud, water and dust related to the sludge, and have the characteristics of easy cleaning, reliable use, energy saving and environmental protection.

[0031] The steam heat exchange drying sludge device of the present application also has the following characteristics:

[0032] (1) High heat exchange capacity. The heat generated by the cross-heat exchange of excess steam or low-grade steam in the steam heat exchanger is used to dry the sludge. The heat exchange efficiency is about 90%, and high-temperature drying greatly improves the drying efficiency.

[0033] (2) The cooling tower is highly efficient. The high humidity return air temperature is high, and the wet bulb temperature of the cooling tower is low, forming a large temperature difference. The cooling tower has a high efficiency, and the cooling capacity / heat can be easily adjusted within a wide range.

[0034] (3) The steam heat exchanger, circulating fan, control cabinet, dehumidification heat exchanger, heat recovery device, spray tower, cooling tower and other components 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.

[0035] (4) High temperature heating creates a mild and safe drying environment. The sludge is heated to 90°C, which is in the pasteurization condition and can effectively kill bacteria.

[0036] (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.

[0037] (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.

[0038] (8) Dehumidification heat exchangers, steam heat exchangers, circulating fans and other devices do not come into contact with dust, are durable, and have an extremely low heat exchange efficiency attenuation rate.

[0039] (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.

[0040] (10) Full-path insulation. The main shell of the dryer is made of rock wool or polyurethane foam with a thickness of more than 80mm. The air duct and the fan duct are wrapped with materials with the same thermal insulation performance, tightly sealed, and leak-proof. 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 leaks in the entire section.

[0041] (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.

[0042] (12) A dust cleaning spiral can be configured to further reduce the workload of daily cleaning and maintenance.

[0043] (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.

[0044] (14) It is simple and beautiful, and reduces the number of boiler devices. It only needs to introduce boiler steam.

[0045] 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 steam heat exchange sludge drying device, Features: 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, the heat exchange device includes a steam heat exchanger, a dehumidification heat exchanger, a dehumidification fan, a heat recovery device, a cooling tower, a spray tower and a circulating fan, the air outlet of the steam heat exchanger is connected to the air inlet of the dryer, the air outlet of the dryer is connected to the dehumidification heat exchanger and the heat recovery device, the rear end of the dehumidification heat exchanger is connected to the steam heat exchanger through the circulating fan, the heat recovery device is respectively connected to the dehumidification fan, the spray tower and the circulating fan, and the cooling tower is connected to the dehumidification heat exchanger.

2. The steam heat exchange sludge drying device according to claim 1, Features: 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 steam heat exchange drying sludge device according to claim 1, Features: The discharge pipe is provided with a feed electric valve.

4. The steam heat exchange sludge drying device according to claim 1, Features: The steam heat exchanger is provided with a steam input pipe for steam to enter, and a condensate water pipe for condensate to flow out. A steam inlet is provided at the end of the steam input pipe, and a condensate water outlet is provided at the end of the condensate water pipe.

5. The steam heat exchange drying sludge device according to claim 1, Features: A condensate pump is provided on the water outlet pipe of the dehumidification heat exchanger.

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