An integrated device for sludge disposal and energy storage and an operating method thereof

Abstract

The present invention provides an integrated sludge disposal and energy storage device and operating method, including a sludge sedimentation tank for primary sludge sedimentation, the sludge sedimentation tank being connected to a secondary sludge sedimentation tank, the secondary sludge sedimentation tank being connected to a sludge drying furnace via a centrifugal concentrator, the sludge drying furnace being connected to a high-temperature heat pump for drying, the outlet of the sludge drying furnace being connected to a sludge pyrolysis furnace, the outlet of the sludge pyrolysis furnace being connected to a sludge heat recovery tank, and the sludge pyrolysis furnace being connected to a pressurized pyrolysis gas storage tank, the top of the sludge pyrolysis furnace being connected to a primary dust removal tank, the primary dust removal tank being connected to a high-temperature material storage tank, the sludge heat recovery tank being connected to a high-temperature material storage tank, and the high-temperature material storage tank being connected to a medium- and low-temperature material storage tank. By providing heat recovery devices at each available link, medium- and low-temperature heat is used in the energy storage and drying process, reducing energy input and improving energy efficiency. In addition, a dedicated high-temperature heat storage tank is provided to use the consolidated sludge particles as a heat storage medium for energy release.

Description

Technical Field

[0001] The present invention relates to the technical field of sludge drying and energy storage, and in particular to an integrated device for sludge disposal and energy storage and an operating method. Background Art

[0002] Existing sludge treatment processes still suffer from incomplete concentration, resulting in a high water content. Directly piling this sludge can lead to water migration or seepage, potentially polluting groundwater. Furthermore, the sludge naturally ferments and produces flammable gases, potentially contaminating the ozone layer and potentially causing explosions. Furthermore, existing sludge drying processes consume significant energy, leading to high sludge treatment costs. While some technologies are currently available to generate electricity from the heat generated during sludge treatment, this heat is low-quality, and the cost of generating electricity from the remaining heat is high.

[0003] Although CN203440222U, CN103011545B, and CN203474614U disclose a two-stage sludge drying and energy recovery system, in which the exhaust port of the sludge storage chamber is connected to the deodorization reactor via a fan, the sludge outlet of the sludge storage chamber is connected to the sludge inlet of the dryer via a sludge pump, the sludge outlet of the dryer is provided with a sludge forming machine, and the sludge discharge port of the sludge forming machine is provided with a belt dryer. This energy recovery system is mainly used to recycle the steam heat generated during the drying process, but its utilization rate is limited. Moreover, it uses an indirect drying method, which has low drying efficiency and high energy consumption.

[0004] CN114542221A discloses using a sludge drying process to store excess energy from thermal power plants to achieve peak load regulation in power plants. This method primarily utilizes thermal energy from the thermal power plants to achieve sludge drying, but this system requires specific operating environments and is not very flexible.

[0005] CN107640875A relates to an energy recovery sludge drying and incineration system, which can solve the problems of high energy consumption, high operating costs and secondary heavy metal pollution during sludge incineration. However, its thermal energy utilization rate is low. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention provides an integrated device for sludge disposal and energy storage and an operating method. By setting a heat recovery device in each available link, medium and low-temperature heat is used in the energy storage and drying process, reducing energy input and improving energy utilization efficiency. In addition, a high-temperature heat storage tank is specially set up to use the solidified sludge particles as a heat storage medium for use in energy release.

[0007] In order to achieve the above technical features, the purpose of the present invention is achieved as follows: an integrated device for sludge disposal and energy storage, including a sludge sedimentation tank for primary sludge sedimentation, the sludge sedimentation tank is connected to a sludge secondary sedimentation tank, the sludge secondary sedimentation tank is connected to a sludge drying furnace through a centrifugal concentrator, the sludge drying furnace is connected to a high-temperature heat pump for drying, the outlet of the sludge drying furnace is connected to a sludge pyrolysis furnace; the outlet of the sludge pyrolysis furnace is connected to a sludge heat recovery tank, and the sludge pyrolysis furnace is also connected to a pressurized pyrolysis gas storage tank; the top of the sludge pyrolysis furnace is connected to a primary dust removal tank, the primary dust removal tank is connected to a high-temperature material storage tank; the sludge heat recovery tank is connected to a high-temperature material storage tank, and the high-temperature material storage tank is connected to a medium and low-temperature material storage tank;

[0008] The top of the pressurized pyrolysis gas storage tank is connected to the gas turbine through a pyrolysis gas control valve. The gas turbine is connected to the air preheating heat exchanger through an electrostatic dust collector for exhaust gas. The air preheating heat exchanger is connected to the inlet of the gas turbine through a variable frequency air compressor, a first air heater bypass three-way valve and a second air heater bypass three-way valve. A connection port A1 is provided on the first air heater bypass three-way valve, and a connection port B1 is provided on the second air heater bypass three-way valve.

[0009] The top of the sludge drying furnace is connected to the steam condenser through the first water vapor condensation induced draft fan bypass three-way valve and the second water vapor condensation induced draft fan bypass three-way valve, and the steam condenser is connected to the sludge sedimentation tank; a water vapor condensation induced draft fan is arranged between the first water vapor condensation induced draft fan bypass three-way valve and the second water vapor condensation induced draft fan bypass three-way valve; a cooling water inlet C and a cooling water outlet D are arranged on the steam condenser.

[0010] A heat exchanger for drying wet sludge is provided inside the sludge drying furnace, and a first screw feeder for discharging sludge is provided at the bottom end of the sludge drying furnace.

[0011] The high-temperature heat pump is connected to the heat exchanger through the second sludge drying heat source three-way valve, and the other end of the heat exchanger is connected to the high-temperature heat pump through the low-temperature heat recovery heat medium circulation pump and the first sludge drying heat source three-way valve. The second sludge drying heat source three-way valve is connected to the pipeline between the low-temperature heat recovery heat medium circulation pump and the first sludge drying heat source three-way valve.

[0012] The interior of the sludge pyrolysis furnace is provided with a preheating heater and a dry distillation heater for pyrolyzing the sludge in sequence from top to bottom, and a second screw feeder for discharging the sludge is provided at the bottom end of the sludge pyrolysis furnace.

[0013] The preheating heater is connected to the preheating regenerator inside the pressurized pyrolysis gas storage tank through a medium-temperature regenerative heat carrier circulation pump.

[0014] The dry distillation heater is connected to the first dry distillation regenerator inside the sludge heat recovery tank through a high-temperature heat recovery heat carrier circulation pump. The bottom end of the sludge heat recovery tank is provided with a third screw feeder for discharging the regenerated sludge.

[0015] The primary dust removal tank is connected to the top of the pressurized pyrolysis gas storage tank through a pyrolysis gas bag dust collector and a pyrolysis gas supercharger; the bottom end of the primary dust removal tank is provided with a fourth screw feeder for discharging sludge dust.

[0016] A second dry distillation regenerator is provided inside the high-temperature material storage tank, and the second dry distillation regenerator is connected to the air heater through a high-temperature energy-releasing heat carrier circulation pump; a fifth screw feeder for discharging high-temperature dried sludge is provided at the bottom end of the high-temperature material storage tank; and a connection port A2 and a connection port B2 are provided on the air heater.

[0017] A drying regenerator is provided inside the medium and low temperature material storage tank, and the drying regenerator is connected through the first sludge drying heat source three-way valve and the second sludge drying heat source three-way valve; the bottom end of the medium and low temperature material storage tank is provided with a sixth screw feeder for discharging medium and low temperature dried sludge.

[0018] The connection port A1 can be connected to the connection port A2, and the connection port B1 can be connected to the connection port B2.

[0019] The upper part of the sludge pyrolysis furnace is connected to the lower part of the sludge pyrolysis furnace through a hot air circulation power fan and a hot air circulation radiation furnace.

[0020] A method for operating an integrated device for sludge disposal and energy storage, the method being implemented using the integrated device, the method specifically comprising:

[0021] Mode 1, sludge drying and energy storage process:

[0022] Mainly used for sludge drying and storing energy in the sludge drying process;

[0023] Mode 2, energy release process:

[0024] Used to release the energy stored in mode 1.

[0025] The sludge drying and energy storage process is specifically as follows:

[0026] The sludge is concentrated in the sludge sedimentation tank and the sludge secondary sedimentation tank to reduce the water content to 96%. Then, it is concentrated in the centrifugal concentrator to reduce the water content to below 35% before entering the sludge drying furnace.

[0027] A low-temperature medium of 90-120°C is used to continuously heat the sludge drying furnace. The driving heat source is provided by a high-temperature heat pump and a medium- and low-temperature material storage tank. When the sludge drying and energy storage processes are in continuous operation, the heat source of the medium- and low-temperature material storage tank is mainly used. When the sludge drying and energy storage processes are discontinuous, the high-temperature heat pump is used as an auxiliary. The gas and steam mixture generated by the temperature rise in the sludge drying furnace is condensed and cooled and depressurized through a steam condenser and discharged to a sludge sedimentation tank. The cold source of the steam condenser comes from the discharge water in the sewage treatment plant. The cold water source enters and exits through the cooling water inlet C and the cooling water outlet D of the steam condenser. When there is too much non-condensable gas in the sludge drying furnace, the steam condensation induced draft fan is started to assist in the discharge of the non-condensable gas. After the sludge is dried to less than 30% in the sludge drying furnace, the sludge is sent to the sludge pyrolysis furnace.

[0028] The sludge pyrolysis furnace is divided into three heating zones from bottom to top. The bottom is the pyrolysis and gasification zone with a working temperature of 500-800℃, the middle is the distillation zone with a working temperature mainly controlled at 200-500℃, and the upper part is the preheating zone with a working temperature of 60-200℃. The pyrolysis and gasification zone is mainly heated by hot air with a temperature not lower than 1100℃. The circulating heating mode is adopted. The mixed gas in the upper part of the furnace is pressurized by the hot air circulation power fan and then enters the hot air circulation radiation furnace for secondary cracking. After sufficient reaction, the cracking gas is sucked into the primary dust removal tank, and then the solid part of the dust is sent to the The high-temperature material storage tank is then sent from the high-temperature material storage tank to the medium- and low-temperature material storage tank. The gas is dusted again by the pyrolysis gas bag dust collector and then pressurized by the pyrolysis gas booster and then heated to the normal temperature section in the pressurized pyrolysis gas storage tank for natural cooling. On the other hand, the crystallized solid material is fed into the sludge heat recovery tank by the screw feeder located at the bottom of the sludge pyrolysis furnace. The sludge heat recovery tank enters the high-temperature material storage tank after heat recovery. This part of the heat is heated in the energy release process and then enters the medium- and low-temperature material storage tank. The heat stored in the medium- and low-temperature material storage tank is used for the sludge drying and energy storage process to complete the sludge drying and energy storage process.

[0029] The energy release process is specifically as follows:

[0030] Among them, connection port A1 is connected to connection port A2, and connection port B1 is connected to connection port B2. On the one hand, the cold air recovers the heat from the exhaust gas of the gas turbine in the air preheating heat exchanger, and then is pressurized by the variable frequency air compressor and enters the air heater for reheating before entering the gas turbine. On the other hand, the high-pressure pyrolysis gas starts from the pressurized pyrolysis gas storage tank and enters the gas turbine through the flow control of the pyrolysis gas control valve, and is mixed with the high-temperature and high-pressure air entering at the same time. After ignition, it drives the gas turbine to generate electricity, and then enters the exhaust gas electrostatic dust removal for further purification, enters the air preheating heat exchanger to transfer heat to the cold air and then is discharged, completing the energy release process.

[0031] The heat source of the air heater comes from the high-temperature material storage tank, and the heating process can be bypassed by jointly controlling the first air heater bypass three-way valve and the second air heater bypass three-way valve.

[0032] The present invention has the following beneficial effects:

[0033] 1. The present invention sets up a heat recovery device in each available link, and uses medium and low temperature heat for the energy storage and drying process, reducing energy input and improving energy utilization efficiency. In addition, a high-temperature heat storage tank is specially set up to use the solidified sludge particles as a heat storage medium for use during energy release.

[0034] 2. During the energy release process, the present invention recycles high-quality heat energy to preheat the gas before the gas turbine generates electricity, thereby increasing the enthalpy of the main gas of the gas turbine and further improving the energy release and power generation efficiency of the gas turbine.

[0035] 3. The present invention couples sludge drying with user-side energy storage, regards the sludge drying process as energy storage, and releases the recovered energy in the energy release process.

[0036] 4. The present invention adds a high-temperature vaporization furnace at the back end of the traditional sludge drying process to perform high-temperature pyrolysis on the pre-dried sludge. The outlet temperature of the pyrolysis furnace is higher than 950°C. This high-temperature pyrolysis furnace adopts closed hot air circulation heating. The use of hot air heating can ensure uniform heating of the sludge during the pyrolysis process, and the high temperature above 950°C avoids the formation of dioxins. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention will be further described below with reference to the accompanying drawings and examples.

[0038] Figure 1 This is a schematic diagram of the integrated device of the present invention.

[0039] Figure 2 This is the structural diagram of the sludge drying furnace of the present invention.

[0040] Figure 3 This is the structural diagram of the sludge pyrolysis furnace of the present invention.

[0041] Figure 4 This is a structural diagram of the pressurized pyrolysis gas storage tank of the present invention.

[0042] Figure 5 This is the structural diagram of the sludge heat recovery tank of the present invention.

[0043] Figure 6 This is the structural diagram of the primary dust removal tank of the present invention.

[0044] Figure 7 This is a structural diagram of the high-temperature material storage tank of the present invention.

[0045] Figure 8 This is a structural diagram of the low-temperature material storage tank in the present invention.

[0046] In the figure: sludge sedimentation tank 1, sludge secondary sedimentation tank 2, high-temperature heat pump 3, sludge drying furnace 4, sludge pyrolysis furnace 5, pressurized pyrolysis gas storage tank 6, sludge heat recovery tank 7, primary dust removal tank 8, high-temperature material storage tank 9, medium and low-temperature material storage tank 10, variable-frequency air compressor 11, hot air circulation power fan 12, pyrolysis gas booster 13, gas turbine 14, steam condensing induced draft fan 15, low-temperature heat recovery heat carrier circulation pump 16, high-temperature energy-releasing heat carrier circulation pump 17, high-temperature heat recovery heat carrier circulation pump 18, medium-temperature heat recovery Heat medium circulation pump 19, air heater 20, hot air circulation radiation furnace 21, pyrolysis gas bag filter 22, exhaust gas electrostatic dust collector 23, air preheating heat exchanger 24, steam condenser 25, first sludge drying heat source three-way valve 26, second sludge drying heat source three-way valve 27, first water vapor condensing induced draft fan bypass three-way valve 28, second water vapor condensing induced draft fan bypass three-way valve 29, first air heater bypass three-way valve 30, second air heater bypass three-way valve 31, centrifugal concentrator 32, pyrolysis gas control valve 33;

[0047] Wet sludge 401, heat exchanger 402, first screw feeder 403;

[0048] Sludge 501, preheating heater 502, dry distillation heater 503, second screw feeder 504;

[0049] Preheating regenerator 601;

[0050] Regenerated sludge 701, first dry distillation regenerator 702, third screw feeder 703;

[0051] Sludge dust 801, fourth screw feeder 802;

[0052] High temperature drying sludge 901, second dry distillation regenerator 902, fifth screw feeder 903;

[0053] Medium and low temperature drying sludge 1001, drying regenerator 1002, sixth screw feeder 1003. DETAILED DESCRIPTION

[0054] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0055] Example 1:

[0056] See also Figure 1-8, an integrated device for sludge disposal and energy storage, including a sludge sedimentation tank 1 for primary sedimentation of sludge, the sludge sedimentation tank 1 is connected to a secondary sludge sedimentation tank 2, the secondary sludge sedimentation tank 2 is connected to a sludge drying furnace 4 through a centrifugal concentrator 32, the sludge drying furnace 4 is connected to a high-temperature heat pump 3 for drying, the outlet of the sludge drying furnace 4 is connected to a sludge pyrolysis furnace 5; the outlet of the sludge pyrolysis furnace 5 is connected to a sludge heat recovery tank 7, and the sludge pyrolysis furnace 5 is also connected to a pressurized pyrolysis gas storage tank 6; the top of the sludge pyrolysis furnace 5 is connected to a primary dust removal tank 8, and the primary dust removal tank 8 is connected to a high-temperature material storage tank 9; the sludge heat recovery tank 7 is connected to a high-temperature material storage tank 9, and the high-temperature material storage tank 9 is connected to a medium and low-temperature material storage tank 10. By adopting the above-mentioned integrated device and setting up heat recovery devices in each available link, medium and low temperature heat is used in the energy storage and drying process, reducing energy input and improving energy utilization efficiency. In addition, a high-temperature heat storage tank is specially set up to use the solidified sludge particles as a heat storage medium for use in energy release.

[0057] Furthermore, the top of the pressurized pyrolysis gas storage tank 6 is connected to the gas turbine 14 through the pyrolysis gas control valve 33, the gas turbine 14 is connected to the air preheating heat exchanger 24 through the exhaust gas electrostatic dust collector 23, and the air preheating heat exchanger 24 is connected to the inlet of the gas turbine 14 through the variable frequency air compressor 11, the first air heater bypass three-way valve 30 and the second air heater bypass three-way valve 31; the first air heater bypass three-way valve 30 is provided with a connection port A1, and the second air heater bypass three-way valve 31 is provided with a connection port B1. The gas turbine 14 can be used to generate electricity. The cold air recovers the heat from the exhaust gas of the combustion engine in the air preheating heat exchanger 24, and then is pressurized by the variable frequency air compressor 11 and enters the air heater 20 for reheating before entering the gas turbine 14. On the other hand, the high-pressure pyrolysis gas starts from the pressurized pyrolysis gas storage tank 6 and enters the gas turbine 14 through the pyrolysis gas control valve 33 under flow control, and is mixed with the high-temperature and high-pressure air entering at the same time. After ignition, it drives the gas turbine 14 to generate electricity, and then enters the exhaust gas electrostatic precipitator 23 for further purification, and then enters the air preheating heat exchanger 24 to transfer heat to the cold air and then be discharged, completing the energy release process.

[0058] During the sludge drying process, the sludge is concentrated in the sludge sedimentation tank 1 and the sludge secondary sedimentation tank 2 to reduce the water content to 96%, and then passes through the centrifugal concentrator 32 to reduce the water content of the sludge to below 35%, and then enters the sludge drying furnace 4.

[0059] For further information, see Figure 2The top of the sludge drying furnace 4 is connected to a steam condenser 25 via a first steam condenser draft bypass three-way valve 28 and a second steam condenser draft bypass three-way valve 29. The steam condenser 25 is connected to the sludge settling tank 1. A steam condenser draft fan 15 is installed between the first steam condenser draft bypass three-way valve 28 and the second steam condenser draft bypass three-way valve 29. The steam condenser 25 is provided with a cooling water inlet C and a cooling water outlet D. Since a gas-vapor mixture is generated during the sludge drying process and requires treatment, the gas-vapor mixture generated by the temperature rise in the sludge drying furnace 4 is condensed, cooled, and pressured by the steam condenser 25 and discharged into the sludge settling tank 1. The steam condenser 25's cooling source is derived from the sewage treatment plant's discharge water. The cooling water flows in and out of the steam condenser 25's cooling water inlet C and cooling water outlet D. When excessive non-condensable gases in the sludge drying furnace 4 occur, the steam condenser draft fan 15 is activated to assist in the discharge of the non-condensable gases.

[0060] Furthermore, the interior of the sludge drying furnace 4 is provided with a heat exchanger 402 for drying the wet sludge 401, and the bottom end of the sludge drying furnace 4 is provided with a first screw feeder 403 for sludge discharge. The sludge drying furnace 4 can be used for continuous low-temperature drying of sludge. Specifically, during the drying process, a low-temperature medium of 90-120°C is used to continuously heat the sludge in the sludge drying furnace 4. The driving heat source is provided by the high-temperature heat pump 3 and the medium- and low-temperature material storage tank 10. When the sludge drying and energy storage processes are continuously operated, the medium- and low-temperature material storage tank 10 is mainly used. When the sludge drying and energy storage processes are discontinuous, the high-temperature heat pump 3 is used as an auxiliary. After the sludge is dried to less than 30% in the sludge drying furnace 4, the sludge is sent to the sludge pyrolysis furnace 5.

[0061] Furthermore, the high-temperature heat pump 3 is connected to the heat exchanger 402 via the second sludge drying heat source three-way valve 27. The other end of the heat exchanger 402 is connected to the high-temperature heat pump 3 via the low-temperature heat recovery heat medium circulation pump 16 and the first sludge drying heat source three-way valve 26. The second sludge drying heat source three-way valve 27 is connected to the pipeline between the low-temperature heat recovery heat medium circulation pump 16 and the first sludge drying heat source three-way valve 26. The high-temperature heat pump 3 is used to provide heat to the sludge drying furnace 4.

[0062] For further information, see Figure 3The interior of the sludge pyrolysis furnace 5 is sequentially equipped with a preheating heater 502 and a dry distillation heater 503 for pyrolyzing sludge 501, from top to bottom. A second screw feeder 504 is provided at the bottom of the sludge pyrolysis furnace 5 for sludge discharge. The upper portion of the sludge pyrolysis furnace 5 is connected to the lower portion of the sludge pyrolysis furnace 5 via a hot air circulation power blower 12 and a hot air circulation radiation furnace 21. The sludge pyrolysis furnace 5 can be mainly divided into three heating zones from bottom to top: the bottom end is the pyrolysis and gasification zone with an operating temperature of 500-800°C, the middle portion is the dry distillation zone with an operating temperature mainly controlled at 200-500°C, and the upper portion is the preheating zone with an operating temperature of 60-200°C. The pyrolysis and gasification zone is mainly heated by hot air with a temperature of no less than 1100°C, using a circulating heating mode. The mixed gas in the upper furnace is pressurized by the hot air circulation power blower 12 and then enters the hot air circulation radiation furnace 21 for secondary cracking.

[0063] Furthermore, the preheating heater 502 is connected to the preheating regenerator 601 inside the pressurized pyrolysis gas storage tank 6 via the medium-temperature regenerative heat medium circulation pump 19. The pressurized pyrolysis gas storage tank 6 is used to heat the preheating heater 502, thereby preheating the sludge 501.

[0064] Furthermore, the dry distillation heater 503 is connected to the first dry distillation regenerator 702 inside the sludge regeneration tank 7 via a high-temperature regenerative heat medium circulation pump 18. A third screw feeder 703 is provided at the bottom of the sludge regeneration tank 7 for discharging the regenerated sludge 701. The dry distillation heater 503 can be used to increase the temperature of the sludge regeneration tank 7 a second time, thereby improving the taste of the low-calorie food.

[0065] Furthermore, the primary dust removal tank 8 is connected to the top of the pressurized pyrolysis gas storage tank 6 via the pyrolysis gas bag filter 22 and the pyrolysis gas booster 13; the bottom of the primary dust removal tank 8 is provided with a fourth screw feeder 802 for discharging sludge dust 801. The cracked gas is sucked into the primary dust removal tank 8 through the primary dust removal tank 8, and then the solid dust is fed into the high-temperature material storage tank 9 through the screw feeder and then into the medium- and low-temperature material storage tank 10 through the screw feeder. The gas is dusted again by the pyrolysis gas bag filter 22, pressurized by the pyrolysis gas booster 13, and then returned to the pressurized pyrolysis gas storage tank 6 to the normal temperature range for natural cooling.

[0066] Furthermore, referring to FIG7 , the high-temperature material storage tank 9 is internally provided with a second retort regenerator 902, which is connected to an air heater 20 via a high-temperature heat-dissipating medium circulation pump 17. A fifth screw feeder 903 is provided at the bottom of the high-temperature material storage tank 9 for discharging high-temperature dried sludge 901. The air heater 20 is provided with connection ports A2 and B2. Part of the heat from the high-temperature material storage tank 9, after being heated during the energy release process, enters the medium- and low-temperature material storage tanks.

[0067] For further information, see Figure 8 The medium- and low-temperature material storage tank 10 is internally provided with a drying regenerator 1002, which is connected via a first sludge drying heat source three-way valve 26 and a second sludge drying heat source three-way valve 27. A sixth screw feeder 1003 is provided at the bottom of the medium- and low-temperature material storage tank 10 for discharging the medium- and low-temperature dried sludge 1001. The heat stored in the medium- and low-temperature material storage tank 10 is used for the sludge drying and energy storage process, completing the sludge drying and energy storage process.

[0068] Furthermore, the connection port A1 can be connected to the connection port A2, and the connection port B1 can be connected to the connection port B2.

[0069] Furthermore, the heat exchanger 402 mainly adopts low-temperature zone heating, and its heat source comes from the high-temperature heat pump 3 and the medium and low-temperature material storage tank 10. The heat carrier medium selected in the heat exchanger 402 is pressurized hot water, and is powered by the low-temperature heat recovery heat carrier circulation pump 16. The heat exchanger 402 is connected to the high-temperature heat pump 3 and the medium and low-temperature material storage tank 10 through the first sludge drying heat source three-way valve 26 and the second sludge drying heat source three-way valve 27 respectively. During the heating and energy storage process, if the medium and low-temperature material storage tank 10 has the heating capacity, the heat is provided by the medium and low-temperature material storage tank 10, and the heat is extracted from the medium and low-temperature material storage tank 10 through the drying heat regenerator 1002, otherwise it is provided by the high-temperature heat pump 3.

[0070] Furthermore, the preheating heater 502 mainly adopts medium and low temperature zone heating, and its heat source comes from the pressurized pyrolysis gas storage tank 6. The heat carrier medium selected in the preheating heater 502 is medium and low temperature heat transfer oil, which is powered by the medium temperature heat recovery heat carrier circulation pump 19 and heats the pressurized pyrolysis gas storage tank 6 through the preheating regenerator 601.

[0071] Furthermore, the dry distillation heater 503 mainly adopts high-temperature heating, and its heat source comes from the sludge heat recovery tank 7. The heat carrier medium selected in the dry distillation heater 503 is high-temperature heat transfer oil or molten salt. The high-temperature heat recovery heat carrier medium circulation pump 18 provides power, and heat is added in the sludge heat recovery tank 7 through the first dry distillation heat regenerator 702.

[0072] Furthermore, the second dry distillation regenerator 902 in the high-temperature material storage tank 9 extracts heat and uses the hot air heater 20 to heat the main air during the energy release process.

[0073] Example 2:

[0074] A method for operating an integrated device for sludge disposal and energy storage, the method being implemented using the integrated device, the method specifically comprising:

[0075] Mode 1, sludge drying and energy storage process:

[0076] Mainly used for sludge drying and storing energy in the sludge drying process;

[0077] Mode 2, energy release process:

[0078] Used to release the energy stored in mode 1.

[0079] Example 3:

[0080] The sludge drying and energy storage process is specifically as follows:

[0081] After the sludge is concentrated in the sludge sedimentation tank 1 and the sludge secondary sedimentation tank 2, the water content of the sludge is reduced to 96%. After the sludge water content is reduced to below 35% by the centrifugal concentrator 32, it enters the sludge drying furnace 4;

[0082] A low-temperature medium of 90-120°C is used to continuously heat the sludge drying furnace 4. The driving heat source is provided by the high-temperature heat pump 3 and the medium- and low-temperature material storage tank 10. When the sludge drying and energy storage processes are in continuous operation, the heat source of the medium- and low-temperature material storage tank 10 is mainly used. When the sludge drying and energy storage processes are discontinuous, the high-temperature heat pump 3 is used as an auxiliary. The gas and steam mixture generated by the temperature rise in the sludge drying furnace 4 is condensed and cooled and reduced in pressure through the steam condenser 25 and discharged to the sludge sedimentation tank 1. The cold source of the steam condenser 25 comes from the discharge water in the sewage treatment plant. The cold water source enters and exits through the cooling water inlet C and the cooling water outlet D of the steam condenser 25. When there is too much non-condensable gas in the sludge drying furnace 4, the steam condensation induced draft fan 15 is started to assist in the discharge of the non-condensable gas. After the sludge in the sludge drying furnace 4 is dried to less than 30%, the sludge is sent to the sludge pyrolysis furnace 5;

[0083] The sludge pyrolysis furnace 5 is divided into three heating zones from bottom to top. The bottom is the pyrolysis and gasification zone with an operating temperature of 500-800°C, the middle is the dry distillation zone with an operating temperature mainly controlled at 200-500°C, and the upper part is the preheating zone with an operating temperature of 60-200°C. The pyrolysis and gasification zone is mainly heated by hot air with a temperature not lower than 1100°C. The circulating heating mode is adopted. The mixed gas at the top of the furnace is pressurized by the hot air circulation power fan 12 and then enters the hot air circulation radiation furnace 21 for secondary cracking. After sufficient reaction, the cracked gas is sucked into the primary dust removal tank 8, and then the solid part of the dust is sent to the high temperature material storage tank. The gas is sent from the high-temperature material storage tank 9 to the medium- and low-temperature material storage tank 10. The gas is dusted again by the pyrolysis gas bag dust collector 22 and then pressurized by the pyrolysis gas booster 13 and then brought to the pressurized pyrolysis gas storage tank 6 for heat recovery to the normal temperature section for natural cooling. On the other hand, the crystallized solid material is sent to the sludge heat recovery tank 7 by the screw feeder located at the bottom of the sludge pyrolysis furnace 5. The sludge heat recovery tank 7 enters the high-temperature material storage tank 9 after heat recovery. This part of the heat is heated in the energy release process and enters the medium- and low-temperature material storage tank 10. The heat stored in the medium- and low-temperature material storage tank 10 is used for the sludge drying and energy storage process, thereby completing the sludge drying and energy storage process.

[0084] Example 4:

[0085] The energy release process is specifically as follows:

[0086] Among them, the connection port A1 is connected to the connection port A2, and the connection port B1 is connected to the connection port B2. On the one hand, the cold air recovers the heat from the exhaust gas of the combustion engine in the air preheating heat exchanger 24, and then is pressurized by the variable frequency air compressor 11 and enters the air heater 20 for reheating before entering the gas turbine 14. On the other hand, the high-pressure pyrolysis gas starts from the pressurized pyrolysis gas storage tank 6 and enters the gas turbine 14 through the pyrolysis gas control valve 33 under flow control, and is mixed with the high-temperature and high-pressure air entering at the same time. After ignition, it drives the gas turbine 14 to generate electricity, and then enters the exhaust gas electrostatic dust collector 23 for further purification, and then enters the air preheating heat exchanger 24 to transfer heat to the cold air before being discharged, completing the energy release process.

[0087] Furthermore, the heat source of the air heater 20 comes from the high-temperature material storage tank 9, and the heating process can be bypassed by jointly controlling the first air heater bypass three-way valve 30 and the second air heater bypass three-way valve 31.

[0088] In summary, the present invention adds a high-temperature gasification furnace at the back end of the traditional sludge drying process to perform high-temperature pyrolysis on the pre-dried sludge. The outlet temperature of the dry material of the pyrolysis furnace is higher than 950°C. This high-temperature pyrolysis furnace adopts closed hot air circulation heating. The use of hot air heating can ensure uniform heating of the sludge during the pyrolysis process, and the high temperature above 950°C avoids the formation of dioxins.

[0089] In order to further improve the system's thermal energy utilization efficiency, the present invention sets up a heat recovery device in each available link, and uses medium and low-temperature heat for the energy storage and drying process, reducing energy input and improving energy utilization efficiency. In addition, a high-temperature heat storage tank is specially set up to use the solidified sludge particles as a heat storage medium for use during energy release.

[0090] During the energy release process, this solution recycles high-quality heat energy to preheat the gas before the gas turbine generates electricity, thereby increasing the enthalpy of the main gas of the gas turbine and further improving the energy release and power generation efficiency of the gas turbine.

Claims

1. An integrated device for sludge disposal and energy storage, characterized in that: The invention comprises a sludge settling tank (1) for primary sludge settling, the sludge settling tank (1) is connected to a sludge secondary settling tank (2), the sludge secondary settling tank (2) is connected to a sludge drying furnace (4) via a centrifugal concentrator (32), the sludge drying furnace (4) is connected to a high-temperature heat pump (3) for drying, the outlet of the sludge drying furnace (4) is connected to a sludge pyrolysis furnace (5); the outlet of the sludge pyrolysis furnace (5) is connected to a sludge heat recovery tank (7), and the sludge pyrolysis furnace (5) is also connected to a pressurized pyrolysis gas storage tank (6); the top of the sludge pyrolysis furnace (5) is connected to a primary dust removal tank (8), and the primary dust removal tank (8) is connected to a high-temperature material storage tank (9); the sludge heat recovery tank (7) is connected to a high-temperature material storage tank (9), and the high-temperature material storage tank (9) is connected to a medium- and low-temperature material storage tank (10); The top of the pressurized pyrolysis gas storage tank (6) is connected to the gas turbine (14) via a pyrolysis gas control valve (33); the gas turbine (14) is connected to the air preheating heat exchanger (24) via a gas exhaust steam electrostatic precipitator (23); the air preheating heat exchanger (24) is connected to the inlet of the gas turbine (14) via a variable frequency air compressor (11), a first air heater bypass three-way valve (30) and a second air heater bypass three-way valve (31); a connection port A1 is provided on the first air heater bypass three-way valve (30), and a connection port B1 is provided on the second air heater bypass three-way valve (31); A second dry distillation regenerator (902) is provided inside the high-temperature material storage tank (9), and the second dry distillation regenerator (902) is connected to the air heater (20) via a high-temperature energy-releasing heat-carrying medium circulation pump (17); a fifth screw feeder (903) for discharging high-temperature dried sludge (901) is provided at the bottom end of the high-temperature material storage tank (9); and a connection port A2 and a connection port B2 are provided on the air heater (20); The connection port A1 can be connected to the connection port A2, and the connection port B1 can be connected to the connection port B2.

2. The integrated sludge disposal and energy storage device according to claim 1, characterized in that: The top of the sludge drying furnace (4) is connected to the steam condenser (25) through a first water vapor condensation induced draft fan bypass three-way valve (28) and a second water vapor condensation induced draft fan bypass three-way valve (29), and the steam condenser (25) is connected to the sludge sedimentation tank (1); a water vapor condensation induced draft fan (15) is provided between the first water vapor condensation induced draft fan bypass three-way valve (28) and the second water vapor condensation induced draft fan bypass three-way valve (29); and a cooling water inlet C and a cooling water outlet D are provided on the steam condenser (25).

3. The integrated sludge disposal and energy storage device according to claim 1, characterized in that: A heat exchanger (402) for drying wet sludge (401) is provided inside the sludge drying furnace (4), and a first screw feeder (403) for discharging sludge is provided at the bottom end of the sludge drying furnace (4).

4. The integrated sludge disposal and energy storage device according to claim 3, characterized in that: The high-temperature heat pump (3) is connected to the heat exchanger (402) via the second sludge drying heat source three-way valve (27); the other end of the heat exchanger (402) is connected to the high-temperature heat pump (3) via the low-temperature heat recovery heat medium circulation pump (16) and the first sludge drying heat source three-way valve (26); the second sludge drying heat source three-way valve (27) is connected to the pipeline between the low-temperature heat recovery heat medium circulation pump (16) and the first sludge drying heat source three-way valve (26).

5. The integrated sludge disposal and energy storage device according to claim 1, characterized in that: The interior of the sludge pyrolysis furnace (5) is provided with a preheating heater (502) and a dry distillation heater (503) for pyrolyzing the sludge (501) in sequence from top to bottom, and a second screw feeder (504) for discharging the sludge is provided at the bottom end of the sludge pyrolysis furnace (5).

6. The integrated sludge disposal and energy storage device according to claim 5, characterized in that: The preheating heater (502) is connected to the preheating regenerator (601) inside the pressurized pyrolysis gas storage tank (6) via a medium-temperature regenerative heat medium circulation pump (19).

7. The integrated sludge disposal and energy storage device according to claim 5, characterized in that: The dry distillation heater (503) is connected to the first dry distillation regenerator (702) inside the sludge heat recovery tank (7) via a high-temperature heat recovery heat medium circulation pump (18). A third screw feeder (703) for discharging the regenerated sludge (701) is provided at the bottom end of the sludge heat recovery tank (7).

8. The integrated sludge disposal and energy storage device according to claim 1, characterized in that: The primary dust removal tank (8) is connected to the top of the pressurized pyrolysis gas storage tank (6) through a pyrolysis gas bag filter (22) and a pyrolysis gas booster (13); a fourth screw feeder (802) for discharging sludge dust (801) is provided at the bottom end of the primary dust removal tank (8).

9. The integrated sludge disposal and energy storage device according to claim 4, characterized in that: A drying regenerator (1002) is provided inside the medium-low temperature material storage tank (10), and the drying regenerator (1002) is connected via a first sludge drying heat source three-way valve (26) and a second sludge drying heat source three-way valve (27); a sixth screw feeder (1003) for discharging the medium-low temperature dried sludge (1001) is provided at the bottom end of the medium-low temperature material storage tank (10).

10. The integrated sludge disposal and energy storage device according to claim 5, characterized in that: The upper portion of the sludge pyrolysis furnace (5) is connected to the lower portion of the sludge pyrolysis furnace (5) via a hot air circulation power fan (12) and a hot air circulation radiation furnace (21).

11. A method for operating an integrated sludge disposal and energy storage device, characterized in that: The method is implemented by using the integrated device according to any one of claims 1 to 10, and the method specifically comprises: Mode 1, sludge drying and energy storage process: Mainly used for sludge drying and storing energy in the sludge drying process; Mode 2, energy release process: Used to release the energy stored in mode 1.

12. The method for operating the integrated sludge disposal and energy storage device according to claim 11, characterized in that: The sludge drying and energy storage process is specifically as follows: The sludge is concentrated in the sludge sedimentation tank (1) and the sludge secondary sedimentation tank (2) to reduce the water content to 96%, and then passes through the centrifugal concentrator (32) to reduce the water content of the sludge to below 35%, and then enters the sludge drying furnace (4); A low-temperature medium of 90-120°C is used to continuously heat the sludge drying furnace (4). The driving heat source is provided by a high-temperature heat pump (3) and a medium-low temperature material storage tank (10). When the sludge drying and energy storage process is continuously operated, the heat source of the medium-low temperature material storage tank (10) is mainly used. When the sludge drying and energy storage process is discontinuous, the high-temperature heat pump (3) is used as an auxiliary. The gas and steam mixture generated by the temperature rise in the sludge drying furnace (4) is condensed and cooled and depressurized through a steam condenser (25) and discharged to a sludge sedimentation tank (1). The cold source of the steam condenser (25) comes from the discharge water in the sewage treatment plant. The cold water source enters and exits through the cooling water inlet C and the cooling water outlet D of the steam condenser (25). When there is too much non-condensable gas in the sludge drying furnace (4), the steam condensation induced draft fan (15) is started to assist in the discharge of the non-condensable gas. After the sludge is dried to less than 30% in the sludge drying furnace (4), the sludge is sent to the sludge pyrolysis furnace (5). The sludge pyrolysis furnace (5) is divided into three heating zones from bottom to top. The bottom is the pyrolysis and gasification zone with an operating temperature of 500-800°C, the middle is the dry distillation zone with an operating temperature mainly controlled at 200-500°C, and the top is the preheating zone with an operating temperature of 60-200°C. The pyrolysis and gasification zone is mainly heated by hot air with a temperature not lower than 1100°C and adopts a circulating heating mode. The mixed gas in the upper part of the furnace is pressurized by the hot air circulation power fan (12) and then enters the hot air circulation radiation furnace (21) for secondary cracking. After sufficient reaction, the cracked gas is sucked into the primary dust removal tank (8), and then the solid part of the dust is sent to the high-temperature material storage tank (9) and then by The high-temperature material storage tank (9) is sent to the medium- and low-temperature material storage tank (10). The gas is dusted again by the pyrolysis gas bag dust collector (22) and then pressurized by the pyrolysis gas booster (13) and then naturally cooled in the pressurized pyrolysis gas storage tank (6). On the other hand, the solid material after crystallization is sent to the sludge heat recovery tank (7) by the screw feeder located at the bottom of the sludge pyrolysis furnace (5). The sludge heat recovery tank (7) enters the high-temperature material storage tank (9) after heat recovery. This part of the heat is heated in the energy release process and enters the medium- and low-temperature material storage tank (10). The heat stored in the medium- and low-temperature material storage tank (10) is used for the sludge drying and energy storage process, thereby completing the sludge drying and energy storage process.

13. The method for operating the integrated sludge disposal and energy storage device according to claim 11, characterized in that: The energy release process is specifically as follows: The connection port A1 is connected to the connection port A2, and the connection port B1 is connected to the connection port B2. On the one hand, the cold air recovers the heat in the exhaust gas of the combustion engine in the air preheating heat exchanger (24), and then is pressurized by the variable frequency air compressor (11) and enters the air heater (20) for reheating before entering the gas turbine (14). On the other hand, the high-pressure pyrolysis gas starts from the pressurized pyrolysis gas storage tank (6) and enters the gas turbine (14) through the pyrolysis gas control valve (33) under flow control, and is mixed with the high-temperature and high-pressure air entering at the same time. After being ignited, it drives the gas turbine (14) to generate electricity, and then enters the exhaust gas electrostatic dust collector (23) for further purification, and then enters the air preheating heat exchanger (24) to transfer heat to the cold air and then be discharged, completing the energy release process.

14. The method for operating the integrated sludge disposal and energy storage device according to claim 13, characterized in that: The heat source of the air heater (20) comes from the high-temperature material storage tank (9), and the heating process can be bypassed by jointly controlling the first air heater bypass three-way valve (30) and the second air heater bypass three-way valve (31).

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