Efficient heat recovery and waste heat utilization sludge drying system

Abstract

The invention relates to the technical field of industrial pollutant drying, and provides an efficient heat recovery and waste heat utilization sludge drying system which comprises a compressor, a drying room, a heating heat exchanger, a heat absorption heat exchanger, a waste heat dissipation mechanism, an expansion valve, a cooling water tower, a refrigerant pipe, a steam pipeline and a cooling water recovery system. The compressor is connected with the heating heat exchanger and the heat absorption heat exchanger through refrigerant pipes and used for driving refrigerants to circularly flow in the system, and the drying room is provided with a wet sludge feeding port and a dry sludge discharging port, connected with the heating heat exchanger through a steam pipeline and used for receiving heat energy from the heating heat exchanger to dry sludge. The heating heat exchanger is connected with the heat absorption heat exchanger through a steam pipeline, hot steam generated in the drying process is conveyed to the heat absorption heat exchanger for heat recovery, the heat absorption heat exchanger is connected with the compressor through a refrigerant pipe, and through the technical scheme, the problems of low energy efficiency and high equipment cost in the prior art are solved.

Description

Technical Field

[0001] The invention relates to the technical field of industrial pollutant drying, and in particular to a sludge drying system with high-efficiency heat recovery and waste heat utilization. Background Art

[0002] In sludge drying technology, heat pump is a common technical means, which can achieve high-efficiency output of heat energy. In traditional heat pump technology, the compressor transfers heat to the drying room through the refrigerant pipeline. During this period, only about 66% of the heat can be used by the sludge water, and the remaining 34% of the heat will be dissipated into the atmosphere through the refrigerant radiator to maintain the normal operating temperature of the heat pump equipment.

[0003] Therefore, there are two major technical defects in traditional sludge drying technology. 1. During the heat conduction process, energy is converted into heat and dissipated in the form of hot steam. How to use high-temperature and high-heat steam to recover energy is the key to achieving high energy efficiency; 2. The heating and heat exchange equipment in the drying room has limited power, and the excess heat will be dissipated and discharged into the atmosphere. The utilization of this part of heat will also affect the energy efficiency and construction cost of the entire set of sludge drying environmental protection equipment. Summary of the invention

[0004] The present invention proposes a high-efficiency heat recovery and waste heat utilization sludge drying system, which solves the problems of low energy efficiency and high equipment cost in related technologies.

[0005] The technical solution of the present invention is as follows:

[0006] It includes compressor, drying room, heating heat exchanger, heat absorption heat exchanger, waste heat dissipation mechanism, expansion valve, cooling water tower, refrigerant pipe, steam pipe and cooling water recovery system, including:

[0007] The compressor is connected to the heating heat exchanger and the heat absorbing heat exchanger through a refrigerant pipe, and is used to drive the refrigerant to circulate in the system;

[0008] The drying room is provided with a wet mud feed port and a dry mud discharge port, and is connected to the heating heat exchanger through a steam pipeline, and is used to receive the heat energy from the heating heat exchanger to dry the sludge;

[0009] The heating heat exchanger is connected to the heat absorbing heat exchanger through a steam pipeline, and the hot steam generated during the drying process is transported to the heat absorbing heat exchanger for heat recovery;

[0010] The heat absorption heat exchanger is connected to the compressor via a refrigerant pipe, and the recovered heat is used to heat the refrigerant cooled by the expansion valve;

[0011] The waste heat dissipation mechanism includes one or a combination of the heat dissipation heat exchanger or the water film dust removal device, which is connected to the drying room and / or cooling water tower through a pipeline to release the excess heat generated during the drying process and filter dust in the air;

[0012] The expansion valve is arranged on the refrigerant pipe and is used to adjust the flow rate and pressure of the refrigerant;

[0013] The cooling water tower is connected to the heating heat exchanger through a cooling water recovery system, and is used to cool the cooling water in the heating heat exchanger;

[0014] The cooling water recovery system is also connected to the drying room and / or the waste heat dissipation mechanism through a pipeline to achieve the recycling of cooling water;

[0015] The drying room is provided with multiple layers of transmission mesh belts for carrying and transmitting sludge. The heating heat exchanger is provided with multiple groups of heat exchange tube bundles for increasing the heat exchange area. The heat absorption heat exchanger is also provided with multiple groups of heat exchange tube bundles for recovering the heat of hot steam. The heat dissipation heat exchanger and the water film dust removal equipment can be used separately or in combination to ensure the stable operation of the system and meet environmental protection requirements.

[0016] Preferably, three layers of transmission mesh belts are provided in the drying room, and a certain distance is maintained between the mesh belts to facilitate uniform distribution and efficient drying of the sludge.

[0017] Preferably, the heating heat exchanger and the heat absorbing heat exchanger are both provided with 10-15 groups of heat exchange tube bundles to improve heat exchange efficiency.

[0018] Preferably, the waste heat dissipation mechanism includes a heat exchanger and a water film dust removal device. The heat exchanger is connected to the drying room through a pipeline to release excess heat into the environment; the water film dust removal device is used to filter dust in the air to ensure a clean environment.

[0019] Preferably, the steam pipeline is provided with a flow regulating valve and a temperature sensor for monitoring and controlling the flow and temperature of the steam to ensure the stability and efficiency of the drying process.

[0020] Preferably, the cooling water recovery system comprises a cooling water pump, a cooling water pipeline and a cooling water tank, the cooling water pump drives the cooling water to circulate in the cooling water pipeline, and the cooling water is collected and stored by the cooling water tank for recycling.

[0021] Preferably, the cooling water recovery system monitors the operating status of each component through sensors, and automatically adjusts the working status of the compressor, expansion valve and flow control valve components according to preset parameters, thereby realizing automatic operation and optimized control of the system.

[0022] Preferably, the cooling water recovery system also includes a safety protection system, which includes overheat protection, overvoltage protection and leakage protection safety measures to ensure the safety and stability of the system during operation.

[0023] The working principle and beneficial effects of the present invention are:

[0024] 1. The present invention forms a set of efficient and energy-saving sludge drying system through the arrangement of equipment such as a compressor, a heating heat exchanger, a heat absorption heat exchanger, a waste heat dissipation mechanism and a cooling water recovery system. The compressor drives the refrigerant to circulate in the system, and transfers the heat energy to the sludge in the drying room through the heating heat exchanger to achieve efficient drying. At the same time, the heat absorption heat exchanger recovers the heat of the hot steam generated during the drying process, which is used to heat the refrigerant cooled by the expansion valve, thereby further improving the energy efficiency. In addition, the waste heat dissipation mechanism effectively releases excess heat and filters dust in the air through the heat dissipation heat exchanger and the water film dust removal equipment, thereby ensuring the stable operation of the system and meeting environmental protection requirements. The cooling water recovery system reduces water resource consumption by recycling cooling water. The coordinated work of this series of equipment not only improves the efficiency of sludge drying, but also realizes the efficient utilization of energy, and ultimately achieves a significant effect of improving energy efficiency.

[0025] 2. The present invention uses heating heat exchangers, heat absorption heat exchangers, heat dissipation heat exchangers and other equipment and optimizes the cooling water recovery system to effectively reduce equipment costs. The heating heat exchanger and the heat absorption heat exchanger are both provided with multiple sets of heat exchange tube bundles, which improves heat exchange efficiency and reduces equipment volume and material consumption. At the same time, the combined use of waste heat dissipation mechanisms makes full use of the excess heat generated during the drying process and reduces additional energy consumption. The cooling water recovery system reduces water resource consumption and the operating cost of cooling equipment by recycling cooling water. In addition, the system is also equipped with an automatic control and safety protection system to reduce manual operation and maintenance costs. The comprehensive application of these measures not only improves the overall performance of the system, but also significantly reduces equipment costs, providing strong support for the sustainable development of the sludge drying industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] Figure 1 This is a flow chart of water film dust removal of the present invention;

[0028] Figure 2 This is a cooling flow chart of the present invention. DETAILED DESCRIPTION

[0029] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Example 1

[0031] like Figure 1-2 As shown, this embodiment proposes a high-efficiency heat recovery and waste heat utilization sludge drying system, including a compressor, a drying room, a heating heat exchanger, a heat absorption heat exchanger, a waste heat dissipation mechanism, an expansion valve, a cooling water tower, a refrigerant pipe, a steam pipe and a cooling water recovery system, wherein:

[0032] The compressor is connected to the heating heat exchanger and the heat absorbing heat exchanger through the refrigerant pipe, and is used to drive the refrigerant to circulate in the system;

[0033] The drying room is provided with a wet mud inlet and a dry mud outlet, and is connected to the heating heat exchanger through a steam pipeline, so as to receive heat energy from the heating heat exchanger to dry the sludge;

[0034] The heating heat exchanger is connected to the heat absorbing heat exchanger through a steam pipeline, and the hot steam generated during the drying process is transported to the heat absorbing heat exchanger for heat recovery;

[0035] The heat-absorbing heat exchanger is connected to the compressor through a refrigerant pipe, and the recovered heat is used to heat the refrigerant that has been cooled by the expansion valve;

[0036] Waste heat dissipation mechanism, including one or a combination of a heat exchanger or a water film dust removal device, connected to the drying room and / or cooling water tower through a pipeline, for releasing the excess heat generated during the drying process and filtering dust in the air;

[0037] The expansion valve is installed on the refrigerant pipe to adjust the flow and pressure of the refrigerant;

[0038] The cooling water tower is connected to the heating heat exchanger through a cooling water recovery system to cool down the cooling water in the heating heat exchanger;

[0039] The cooling water recovery system is also connected to the drying room and / or waste heat dissipation mechanism through pipelines to achieve the recycling of cooling water;

[0040] The drying room is equipped with multiple layers of transmission mesh belts for carrying and transporting sludge. The heating heat exchanger is equipped with multiple groups of heat exchange tube bundles to increase the heat exchange area. The heat absorption heat exchanger is also equipped with multiple groups of heat exchange tube bundles to recover the heat of hot steam. The heat dissipation heat exchanger and water film dust removal equipment can be used separately or in combination to ensure the stable operation of the system and meet environmental protection requirements.

[0041] There are three layers of transmission mesh belts in the drying room, and a certain distance is maintained between the mesh belts to facilitate the uniform distribution and efficient drying of the sludge.

[0042] Both the heating heat exchanger and the heat absorption heat exchanger are equipped with 10 groups of heat exchange tube bundles to improve the heat exchange efficiency.

[0043] The waste heat dissipation mechanism includes a heat exchanger and a water film dust removal device. The heat exchanger is connected to the drying room through a pipeline to release the excess heat into the environment; the water film dust removal device is used to filter the dust in the air to ensure a clean environment.

[0044] The steam pipeline is equipped with a flow regulating valve and a temperature sensor to monitor and control the flow and temperature of the steam to ensure the stability and efficiency of the drying process.

[0045] The cooling water recovery system includes a cooling water pump, a cooling water pipeline and a cooling water tank. The cooling water pump drives the cooling water to circulate in the cooling water pipeline, and the cooling water is collected and stored in the cooling water tank for recycling.

[0046] The cooling water recovery system monitors the operating status of each component through sensors, and automatically adjusts the working status of the compressor, expansion valve and flow control valve components according to preset parameters to achieve automatic operation and optimized control of the system.

[0047] The cooling water recovery system also includes a safety protection system, which includes overheat protection, overvoltage protection and leakage protection safety measures to ensure the safety and stability of the system during operation.

[0048] In this embodiment, first, the system is prepared before startup, and each component of the high-efficiency heat recovery and waste heat utilization sludge drying system is checked, including the compressor, drying room, heating heat exchanger, heat absorption heat exchanger, waste heat dissipation mechanism (including heat dissipation heat exchanger and water film dust removal equipment), expansion valve, cooling water tower, cooling water recovery system, etc., to ensure that they are leak-free, unblocked, and operate normally. At the same time, the cooling water recovery system is turned on to allow the cooling water to circulate in the pipeline to ensure that there is enough cooling water reserve in the cooling water tank.

[0049] Next, start the system power supply, perform system initialization settings, set key parameters such as drying temperature, humidity, steam flow, etc., and ensure that the system operates according to the preset requirements;

[0050] Once the system is ready, the sludge drying process begins. The sludge to be dried is evenly distributed on the three-layer transmission mesh belt in the drying room through the wet mud feed port. The mesh belts are kept at a distance of 10 cm to ensure uniform distribution and efficient drying of the sludge. The compressor starts working to drive the refrigerant to circulate in the system. The heating heat exchanger receives the refrigerant from the compressor and exchanges heat with the hot steam in the steam pipe through the 10 sets of internal heat exchange tube bundles to generate heat energy. This heat energy is transported to the drying room through the steam pipe to dry the sludge.

[0051] During the drying process, the hot steam generated in the drying room is transported to the heat absorption heat exchanger through the steam pipe. The 10 groups of heat exchange tube bundles in the heat absorption heat exchanger recover the heat of the hot steam and transport the heat back to the compressor through the refrigerant pipe to heat the refrigerant cooled by the expansion valve. This heat recovery mechanism effectively improves the energy utilization efficiency of the system. The excess heat is processed by the waste heat dissipation mechanism. The heat dissipation heat exchanger releases the excess heat into the environment, while the water film dust removal equipment is responsible for filtering dust in the air to ensure a clean environment.

[0052] When the sludge reaches the set dryness, it is discharged from the drying room through the dry sludge outlet. At this time, the control system will automatically adjust the drying parameters, such as steam flow, temperature, etc., according to the drying effect and energy consumption to optimize the drying process. During the drying process, the cooling water recovery system is also running at the same time. The cooling water in the heating heat exchanger will absorb heat and heat up, and then flow back to the cooling water tower through the cooling water pipeline for cooling treatment. The cooling water pump drives the cooling water to circulate in the pipeline to ensure the cooling effect. The cooling water cooled by the cooling water tower re-enters the heating heat exchanger through the cooling water recovery system for recycling. The cooling water tank is used to collect and store cooling water so as to provide sufficient cooling water for the system when needed;

[0053] The entire system monitors the operating status of each component in real time through sensors, including temperature, pressure, flow and other parameters. According to preset parameters and real-time monitoring data, the control system automatically adjusts the working status of components such as the compressor, expansion valve and flow control valve to ensure the stability and efficiency of the system. At the same time, the system is also equipped with safety protection systems, such as overheat protection, overvoltage protection and leakage protection, to ensure the safety and stability of the system during operation;

[0054] During the operation of the system, the dust and debris in the drying room should be cleaned regularly to ensure the normal operation of the system. At the same time, the cooling water quality and cooling effect of the cooling water recovery system should be checked regularly to ensure that the system has sufficient cooling capacity. If any abnormal situation occurs, it should be handled and recorded in time for subsequent analysis and improvement.

[0055] Example 2

[0056] like Figure 1-2 As shown, based on the same concept as the above-mentioned embodiment 1, this embodiment also proposes the following Figure 1-2 As shown, this embodiment proposes a high-efficiency heat recovery and waste heat utilization sludge drying system, including a compressor, a drying room, a heating heat exchanger, a heat absorption heat exchanger, a waste heat dissipation mechanism, an expansion valve, a cooling water tower, a refrigerant pipe, a steam pipe and a cooling water recovery system, wherein:

[0057] The compressor is connected to the heating heat exchanger and the heat absorbing heat exchanger through the refrigerant pipe, and is used to drive the refrigerant to circulate in the system;

[0058] The drying room is provided with a wet mud inlet and a dry mud outlet, and is connected to the heating heat exchanger through a steam pipeline, so as to receive heat energy from the heating heat exchanger to dry the sludge;

[0059] The heating heat exchanger is connected to the heat absorbing heat exchanger through a steam pipeline, and the hot steam generated during the drying process is transported to the heat absorbing heat exchanger for heat recovery;

[0060] The heat-absorbing heat exchanger is connected to the compressor through a refrigerant pipe, and the recovered heat is used to heat the refrigerant that has been cooled by the expansion valve;

[0061] Waste heat dissipation mechanism, including one or a combination of a heat exchanger or a water film dust removal device, connected to the drying room and / or cooling water tower through a pipeline, for releasing the excess heat generated during the drying process and filtering dust in the air;

[0062] The expansion valve is installed on the refrigerant pipe to adjust the flow and pressure of the refrigerant;

[0063] The cooling water tower is connected to the heating heat exchanger through a cooling water recovery system to cool down the cooling water in the heating heat exchanger;

[0064] The cooling water recovery system is also connected to the drying room and / or waste heat dissipation mechanism through pipelines to achieve the recycling of cooling water;

[0065] The drying room is equipped with multiple layers of transmission mesh belts for carrying and transporting sludge. The heating heat exchanger is equipped with multiple groups of heat exchange tube bundles to increase the heat exchange area. The heat absorption heat exchanger is also equipped with multiple groups of heat exchange tube bundles to recover the heat of hot steam. The heat dissipation heat exchanger and water film dust removal equipment can be used separately or in combination to ensure the stable operation of the system and meet environmental protection requirements.

[0066] There are three layers of transmission mesh belts in the drying room, and a certain distance is maintained between the mesh belts to facilitate the uniform distribution and efficient drying of the sludge.

[0067] Both the heating heat exchanger and the heat absorption heat exchanger are equipped with 13 groups of heat exchange tube bundles to improve the heat exchange efficiency.

[0068] The waste heat dissipation mechanism includes a heat exchanger and a water film dust removal device. The heat exchanger is connected to the drying room through a pipeline to release the excess heat into the environment; the water film dust removal device is used to filter the dust in the air to ensure a clean environment.

[0069] The steam pipeline is equipped with a flow regulating valve and a temperature sensor to monitor and control the flow and temperature of the steam to ensure the stability and efficiency of the drying process.

[0070] The cooling water recovery system includes a cooling water pump, a cooling water pipeline and a cooling water tank. The cooling water pump drives the cooling water to circulate in the cooling water pipeline, and the cooling water is collected and stored in the cooling water tank for recycling.

[0071] The cooling water recovery system monitors the operating status of each component through sensors, and automatically adjusts the working status of the compressor, expansion valve and flow control valve components according to preset parameters to achieve automatic operation and optimized control of the system.

[0072] The cooling water recovery system also includes a safety protection system, which includes overheat protection, overvoltage protection and leakage protection safety measures to ensure the safety and stability of the system during operation.

[0073] In this embodiment, first, before starting the high-efficiency heat recovery and waste heat utilization sludge drying system, a comprehensive inspection of the system is carried out to ensure that the compressor, drying room, heating heat exchanger, heat absorption heat exchanger, waste heat dissipation mechanism (including heat dissipation heat exchanger and water film dust removal equipment), expansion valve, cooling water tower, cooling water recovery system and other components are in good condition, without leakage, blockage, and can be started and operated normally;

[0074] Next, turn on the cooling water recovery system and start the cooling water pump to circulate the cooling water in the cooling water pipeline. Ensure that there is enough cooling water reserve through the cooling water tank to provide stable cooling capacity for the system. Set the operating parameters of the cooling water pump, such as flow rate of 15m 3 / h, with a head of 25m to meet the system's demand for cooling water;

[0075] Then, start the system power supply, perform initialization settings, and set the temperature, humidity and other parameters in the drying room according to the properties of the sludge and the drying requirements, as well as key parameters such as the flow rate and temperature of the steam. In this embodiment, the target temperature in the drying room is set to 80°C, the humidity is 30%, and the steam flow rate is 8m 3 / h;

[0076] After the system is started, the sludge drying process begins. The sludge to be dried is evenly distributed on the three-layer transmission mesh belt in the drying room through the wet mud feed port. The mesh belts are kept at a distance of 20 cm to ensure the uniform distribution and efficient drying of the sludge. With the operation of the transmission mesh belt, the sludge is fully dried in the drying room. At the same time, the compressor starts to work, driving the refrigerant to circulate in the system. The heating heat exchanger receives the refrigerant from the compressor and exchanges heat with the hot steam in the steam pipe through the 13 sets of internal heat exchange tube bundles. The addition of these heat exchange tube bundles improves the heat exchange efficiency and ensures the full utilization of heat energy. The hot steam is transported to the drying room through the steam pipe to provide the required heat energy for the sludge.

[0077] During the drying process, the generated hot steam is transported to the heat absorption heat exchanger through the steam pipe. The 13 groups of heat exchange tube bundles in the heat absorption heat exchanger recover the heat of the hot steam and transport the heat back to the compressor through the refrigerant pipe. In this way, the recovered heat is used to heat the refrigerant cooled by the expansion valve to achieve efficient use of energy. The excess heat is processed by the waste heat heat dissipation mechanism. The heat dissipation heat exchanger is connected to the drying room through a pipeline to release the excess heat into the environment. At the same time, the water film dust removal equipment filters the dust in the air to ensure a clean environment. The heat dissipation capacity of the heat dissipation heat exchanger and the filtration efficiency of the water film dust removal equipment are reasonably configured according to the system scale and processing capacity.

[0078] The steam pipeline is provided with a flow regulating valve and a temperature sensor for real-time monitoring and control of the flow and temperature of the steam. According to the requirements of the drying process, the flow of the steam is controlled by adjusting the opening of the flow regulating valve; the temperature of the steam is monitored by the temperature sensor to ensure that it fluctuates within a suitable range. In this embodiment, the flow range of the steam is set to 6m 3 / h, temperature range is 70℃;

[0079] During the drying process, the cooling water recovery system is running at the same time. After the cooling water in the heating heat exchanger absorbs heat, it flows back to the cooling water tower through the cooling water pipe for cooling treatment. The cooling water pump continuously drives the cooling water to circulate in the pipe to ensure the cooling effect. The cooling water cooled by the cooling water tower re-enters the heating heat exchanger through the cooling water recovery system for recycling. The cooling water tank is used to collect and store cooling water so as to provide sufficient cooling water for the system when needed;

[0080] The entire system uses sensors to monitor the operating status of each component in real time, such as temperature, pressure, flow and other parameters. According to the preset parameters and real-time monitoring data, the control system automatically adjusts the working status of components such as the compressor, expansion valve and flow control valve to achieve automatic operation and optimized control of the system. In addition, the system is also equipped with a safety protection system, including safety measures such as overheating protection, overvoltage protection and leakage protection, to ensure the safety and stability of the system during operation;

[0081] During the operation of the system, the dust and debris in the drying room should be cleaned regularly to keep the equipment clean and operating normally. At the same time, the cooling water quality and cooling effect of the cooling water recovery system should be checked regularly to ensure that the system has sufficient cooling capacity. If any abnormal situation occurs, it should be handled and recorded in time for subsequent analysis and improvement.

[0082] Example 3

[0083] like Figure 1-2 As shown, based on the same concept as the above-mentioned embodiment 1, this embodiment also proposes the following Figure 1-2 As shown, this embodiment proposes a high-efficiency heat recovery and waste heat utilization sludge drying system, including a compressor, a drying room, a heating heat exchanger, a heat absorption heat exchanger, a waste heat dissipation mechanism, an expansion valve, a cooling water tower, a refrigerant pipe, a steam pipe and a cooling water recovery system, wherein:

[0084] The compressor is connected to the heating heat exchanger and the heat absorbing heat exchanger through the refrigerant pipe, and is used to drive the refrigerant to circulate in the system;

[0085] The drying room is provided with a wet mud inlet and a dry mud outlet, and is connected to the heating heat exchanger through a steam pipeline, so as to receive heat energy from the heating heat exchanger to dry the sludge;

[0086] The heating heat exchanger is connected to the heat absorbing heat exchanger through a steam pipeline, and the hot steam generated during the drying process is transported to the heat absorbing heat exchanger for heat recovery;

[0087] The heat-absorbing heat exchanger is connected to the compressor through a refrigerant pipe, and the recovered heat is used to heat the refrigerant that has been cooled by the expansion valve;

[0088] Waste heat dissipation mechanism, including one or a combination of a heat exchanger or a water film dust removal device, connected to the drying room and / or cooling water tower through a pipeline, for releasing the excess heat generated during the drying process and filtering dust in the air;

[0089] The expansion valve is installed on the refrigerant pipe to adjust the flow and pressure of the refrigerant;

[0090] The cooling water tower is connected to the heating heat exchanger through a cooling water recovery system to cool down the cooling water in the heating heat exchanger;

[0091] The cooling water recovery system is also connected to the drying room and / or waste heat dissipation mechanism through pipelines to achieve the recycling of cooling water;

[0092] The drying room is equipped with multiple layers of transmission mesh belts for carrying and transporting sludge. The heating heat exchanger is equipped with multiple groups of heat exchange tube bundles to increase the heat exchange area. The heat absorption heat exchanger is also equipped with multiple groups of heat exchange tube bundles to recover the heat of hot steam. The heat dissipation heat exchanger and water film dust removal equipment can be used separately or in combination to ensure the stable operation of the system and meet environmental protection requirements.

[0093] There are three layers of transmission mesh belts in the drying room, and a certain distance is maintained between the mesh belts to facilitate the uniform distribution and efficient drying of the sludge.

[0094] Both the heating heat exchanger and the heat absorption heat exchanger are equipped with 15 groups of heat exchange tube bundles to improve the heat exchange efficiency.

[0095] The waste heat dissipation mechanism includes a heat exchanger and a water film dust removal device. The heat exchanger is connected to the drying room through a pipeline to release the excess heat into the environment; the water film dust removal device is used to filter the dust in the air to ensure a clean environment.

[0096] The steam pipeline is equipped with a flow regulating valve and a temperature sensor to monitor and control the flow and temperature of the steam to ensure the stability and efficiency of the drying process.

[0097] The cooling water recovery system includes a cooling water pump, a cooling water pipeline and a cooling water tank. The cooling water pump drives the cooling water to circulate in the cooling water pipeline, and the cooling water is collected and stored in the cooling water tank for recycling.

[0098] The cooling water recovery system monitors the operating status of each component through sensors, and automatically adjusts the working status of the compressor, expansion valve and flow control valve components according to preset parameters to achieve automatic operation and optimized control of the system.

[0099] The cooling water recovery system also includes a safety protection system, which includes overheat protection, overvoltage protection and leakage protection safety measures to ensure the safety and stability of the system during operation.

[0100] In this embodiment, before starting the high-efficiency heat recovery and waste heat utilization sludge drying system, first ensure the integrity and functionality of each component of the system, the compressor, drying room, heating heat exchanger, heat absorption heat exchanger, waste heat dissipation mechanism (including heat dissipation heat exchanger and water film dust removal equipment), expansion valve, cooling water tower, refrigerant pipe, steam pipeline and cooling water recovery system, etc. must be carefully inspected to ensure that there is no leakage, no blockage, and are ready to be put into operation;

[0101] Start the cooling water recovery system, turn on the cooling water pump, and set its flow rate to 20m 3 / h, head is 30m, cooling water starts to circulate in the system through cooling water pipes, and at the same time, ensure that there is enough cooling water reserve in the cooling water tank, usually maintained at about 80% of the tank capacity, turn on the system power, perform initialization settings, according to the specific properties of the sludge and drying requirements, set the target temperature in the drying room to 85℃, humidity to 25%, the initial opening of the flow control valve on the steam pipe to 50%, and the temperature sensor to monitor the range of 95℃;

[0102] After the system is started, the wet sludge is evenly distributed on the three-layer transmission mesh belt in the drying room through the wet sludge feed port. The mesh belts are kept 30cm apart to ensure that the sludge can be evenly distributed and fully dried. As the transmission mesh belt runs, the sludge begins to receive heat energy from the heating heat exchanger for drying. The compressor starts to work and drives the refrigerant to circulate in the system through the refrigerant pipe. The 15 groups of heat exchange tube bundles in the heating heat exchanger exchange heat with the hot steam in the steam pipe to generate high-temperature heat energy. This heat energy is transported to the drying room through the steam pipe to provide the heat required for drying the sludge.

[0103] During the drying process, the hot steam generated is transported to the heat absorption heat exchanger through the steam pipe. The 15 groups of heat exchange tube bundles in the heat absorption heat exchanger recover the heat of the hot steam and transport the heat back to the compressor through the refrigerant pipe to heat the refrigerant cooled by the expansion valve. This process effectively improves the energy utilization efficiency.

[0104] The excess heat is processed by the waste heat dissipation mechanism. The heat exchanger is connected to the drying room through a pipeline to release the excess heat into the environment. The heat dissipation power of the heat exchanger is set to 100kW to ensure that the temperature in the drying room can be effectively controlled. At the same time, the water film dust removal equipment is started to filter the dust in the air to ensure a clean environment. The flow control valve and temperature sensor on the steam pipeline monitor the flow and temperature of the steam in real time. According to the needs of the drying process, the opening of the flow control valve can be adjusted to 70% to ensure that the steam flow is within 12m 3 / h; the temperature sensor ensures that the steam temperature is stable at 90℃;

[0105] The cooling water recovery system operates continuously to cool down the cooling water in the heating heat exchanger. The cooling water pump maintains a constant flow and head to ensure that the cooling water circulates in the cooling water pipeline. The cooling water is collected and stored in the cooling water tank so that it can be recycled into the heating heat exchanger when needed. The entire system monitors the operating status of each component in real time through sensors, such as temperature, pressure, flow and other parameters. The control system automatically adjusts the working status of components such as the compressor, expansion valve and flow control valve according to preset parameters and real-time monitoring data, realizing automatic operation and optimized control of the system;

[0106] At the same time, the safety protection system of the cooling water recovery system is also in operation. Safety measures such as overheating protection, overvoltage protection and leakage protection ensure the safety and stability of the system during operation. Any abnormal situation will trigger the safety protection system and take timely measures to protect the safety of equipment and personnel. Through this high-efficiency heat recovery and waste heat utilization sludge drying system, efficient sludge drying and energy recovery can be achieved, while meeting environmental protection requirements and achieving sustainable development.

[0107] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. High-efficiency heat recovery and waste heat utilization sludge drying system, characterized by: It includes compressor, drying room, heating heat exchanger, heat absorption heat exchanger, waste heat dissipation mechanism, expansion valve, cooling water tower, refrigerant pipe, steam pipe and cooling water recovery system, including: The compressor is connected to the heating heat exchanger and the heat absorbing heat exchanger through a refrigerant pipe, and is used to drive the refrigerant to circulate in the system; The drying room is provided with a wet mud feed port and a dry mud discharge port, and is connected to the heating heat exchanger through a steam pipeline, and is used to receive the heat energy from the heating heat exchanger to dry the sludge; The heating heat exchanger is connected to the heat absorbing heat exchanger through a steam pipeline, and the hot steam generated during the drying process is transported to the heat absorbing heat exchanger for heat recovery; The heat absorption heat exchanger is connected to the compressor via a refrigerant pipe, and the recovered heat is used to heat the refrigerant cooled by the expansion valve; The waste heat dissipation mechanism includes one or a combination of the heat dissipation heat exchanger or the water film dust removal device, which is connected to the drying room and / or cooling water tower through a pipeline to release the excess heat generated during the drying process and filter dust in the air; The expansion valve is arranged on the refrigerant pipe and is used to adjust the flow rate and pressure of the refrigerant; The cooling water tower is connected to the heating heat exchanger through a cooling water recovery system, and is used to cool the cooling water in the heating heat exchanger; The cooling water recovery system is also connected to the drying room and / or the waste heat dissipation mechanism through a pipeline to achieve the recycling of cooling water; The drying room is provided with multiple layers of transmission mesh belts for carrying and transmitting sludge. The heating heat exchanger is provided with multiple groups of heat exchange tube bundles for increasing the heat exchange area. The heat absorption heat exchanger is also provided with multiple groups of heat exchange tube bundles for recovering the heat of hot steam. The heat dissipation heat exchanger and the water film dust removal equipment can be used separately or in combination to ensure the stable operation of the system and meet environmental protection requirements.

2. The high-efficiency heat recovery and waste heat utilization sludge drying system according to claim 1 is characterized in that: The drying room is provided with three layers of transmission mesh belts, and a certain distance is maintained between the mesh belts to facilitate uniform distribution and efficient drying of the sludge.

3. The high-efficiency heat recovery and waste heat utilization sludge drying system according to claim 1 is characterized in that: The heating heat exchanger and the heat absorbing heat exchanger are both provided with 10-15 groups of heat exchange tube bundles to improve the heat exchange efficiency.

4. The high-efficiency heat recovery and waste heat utilization sludge drying system according to claim 1 is characterized in that: The waste heat dissipation mechanism includes a heat exchanger and a water film dust removal device. The heat exchanger is connected to the drying room through a pipeline to release the excess heat into the environment; the water film dust removal device is used to filter dust in the air to ensure a clean environment.

5. The high-efficiency heat recovery and waste heat utilization sludge drying system according to claim 1 is characterized in that: The steam pipeline is provided with a flow regulating valve and a temperature sensor for monitoring and controlling the flow and temperature of the steam to ensure the stability and efficiency of the drying process.

6. The high-efficiency heat recovery and waste heat utilization sludge drying system according to claim 1 is characterized in that: The cooling water recovery system includes a cooling water pump, a cooling water pipeline and a cooling water tank. The cooling water pump drives the cooling water to circulate in the cooling water pipeline, and the cooling water is collected and stored by the cooling water tank for recycling.

7. The high-efficiency heat recovery and waste heat utilization sludge drying system according to claim 1 is characterized in that: The cooling water recovery system monitors the operating status of each component through sensors, and automatically adjusts the working status of the compressor, expansion valve and flow control valve components according to preset parameters, thereby realizing automatic operation and optimized control of the system.

8. The high-efficiency heat recovery and waste heat utilization sludge drying system according to claim 1 is characterized in that: The cooling water recovery system also includes a safety protection system, which includes overheat protection, overvoltage protection and leakage protection safety measures to ensure the safety and stability of the system during operation.

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