A sludge treatment system for a heat storage waste incineration power plant

Abstract

The present invention discloses a sludge treatment system for a heat storage waste incineration power plant, comprising: a photovoltaic power generation unit, an auxiliary heat unit, a first drying treatment unit, a second drying treatment unit, a third drying treatment unit, a transfer bin and an incinerator; the photovoltaic power generation unit, the auxiliary heat unit, the first drying treatment unit, the second drying treatment unit and the third drying treatment unit are connected in sequence; wherein a sludge inlet is arranged above the first drying treatment unit; a sludge outlet is arranged below the third drying treatment unit; the sludge outlet is connected to the transfer bin; the transfer bin is connected to the incinerator; a high-temperature steam unit is arranged above the second drying treatment unit; a lava steam heat storage unit is arranged above the third drying treatment unit; the high-temperature steam unit is connected to the lava steam heat storage unit; the present invention improves the treatment efficiency of sludge co-combustion, strengthens the sludge treatment capacity of the waste incineration power plant, and helps to achieve harmless treatment of sludge.

Description

Technical Field

[0001] The invention relates to the technical field of waste incineration power plants and sludge treatment, and in particular to a sludge treatment system for a heat storage waste incineration power plant. Background Art

[0002] With the continuous development of sludge co-combustion technology, sludge co-combustion and harmless treatment in waste incineration power plants has become one of the mainstream ways of sludge treatment. After drying the sludge, it is mixed and burned in the waste incinerator, which requires less modification to the existing facilities and can greatly reduce the cost of sludge treatment compared with the sludge harmless treatment process alone. With the continuous development of renewable energy technology, the application of renewable energy to dry sludge can greatly reduce the energy consumption of sludge treatment and realize a low-carbon sludge treatment process.

[0003] At present, some waste incineration power plants have achieved sludge co-combustion, but the fluctuation of sludge moisture content will affect the combustion conditions of the incinerator, thereby affecting the turbine conditions. In the context of the maturity of molten salt heat storage technology, its introduction into the sludge drying process can, on the one hand, recover the heat of high-temperature steam, and on the other hand, accurately control the moisture content of the sludge after drying, thereby minimizing the impact of sludge co-combustion on the combustion conditions of the incinerator and improving the sludge treatment efficiency. Summary of the invention

[0004] Purpose of the invention: The purpose of the present invention is to provide a heat storage waste incineration power plant sludge treatment system to effectively improve the accuracy of sludge drying treatment, ensure the stable combustion condition of the incinerator, and realize the low-carbon sludge treatment process.

[0005] Technical solution: A sludge treatment system for a heat storage waste incineration power plant described in the present invention comprises: a photovoltaic power generation unit, an auxiliary heat unit, a first drying treatment unit, a second drying treatment unit, a third drying treatment unit, a transfer warehouse and an incinerator;

[0006] The photovoltaic power generation unit, the auxiliary heat unit, the first drying treatment unit, the second drying treatment unit, and the third drying treatment unit are connected in sequence; wherein a sludge inlet is arranged above the first drying treatment unit; a sludge outlet is arranged below the third drying treatment unit; the sludge outlet is connected to the transfer bin; the transfer bin is connected to the incinerator; a high-temperature steam unit is arranged above the second drying treatment unit; and a lava steam heat storage unit is arranged above the third drying treatment unit;

[0007] The high temperature steam unit is connected to the lava steam heat storage unit.

[0008] Furthermore, the photovoltaic power generation unit is used to convert light energy into electrical energy to supply energy to the auxiliary heating unit;

[0009] The auxiliary heating unit is used to receive the electric energy from the photovoltaic power generation unit and provide heat to the first drying treatment unit, thereby drying the sludge by means of electric heating;

[0010] The high-temperature steam unit is used to dry the sludge by extracting part of the high-temperature steam at the inlet of the steam turbine. One part of the steam is directed to the second drying treatment unit to dry the sludge by direct heat exchange, and the other part is directed to the molten salt heat storage unit to store the heat of the steam.

[0011] The molten salt heat storage unit is used to store the heat of high-temperature steam and supply heat to the third drying treatment unit to dry the sludge through the heat exchange medium;

[0012] The first drying treatment unit is used to receive the cut sludge blocks from the sludge inlet, preliminarily dry the sludge, and transport the sludge to the second drying treatment unit through a conveyor belt;

[0013] The second drying treatment unit is used to receive the sludge delivered by the first drying unit, further dry the sludge using high-temperature steam, and deliver the sludge to the third drying treatment unit via a conveyor belt;

[0014] The third drying treatment unit is used to receive the sludge delivered by the second drying unit, and finally dry the sludge using the heat delivered by the molten salt heat storage unit, and deliver the sludge to the transfer bin through the sludge outlet;

[0015] The transfer bin is used to receive and store the sludge delivered by the third drying treatment unit, and then deliver it to the incinerator after further crushing;

[0016] The incinerator is used to incinerate various types of garbage transported to the power plant, and to harmlessly treat the sludge input from the transfer warehouse by incineration.

[0017] Furthermore, sludge humidity sensors are installed at the sludge inlet, the first drying treatment unit outlet, the second drying treatment unit outlet, the third drying treatment unit outlet and the transfer warehouse outlet to monitor the changes in the moisture content of the sludge in each process, determine the drying effect of each sludge drying treatment unit, and the sludge parameters entering the incinerator.

[0018] The present invention provides a method for treating sludge in a heat storage waste incineration power plant, comprising the following steps:

[0019] (1) Confirm the amount of sludge to be treated, turbine operating conditions, and weather conditions, and adjust the sludge treatment rate according to the expected output power of photovoltaic power generation;

[0020] (2) A three-stage drying method is used to obtain dried sludge with precise moisture content;

[0021] (3) Adjust the sludge co-combustion rate in the incinerator according to the sludge accumulation in the transfer bin and the sludge treatment rate of the third drying treatment unit.

[0022] Furthermore, the step (2) includes the following steps:

[0023] (21) Calculating the heat required for different sludge treatment amounts based on the sludge inlet moisture content and the target sludge moisture content set at the outlet of the first drying treatment unit, and performing preliminary matching based on the output heat of the auxiliary heating unit;

[0024] (22) Monitor the moisture content of the sludge at the outlet of the first drying treatment unit in real time, and adjust the sludge feed rate according to the deviation between the actual value and the set value, so that the moisture content of the sludge at the outlet of the first drying treatment unit reaches the set value;

[0025] (23) Calculate the heat required for sludge drying based on the actual moisture content of the sludge at the outlet of the first drying treatment unit, the set value of the moisture content of the sludge at the outlet of the second drying treatment unit, and the sludge treatment volume; set the initial flow rate of the high-temperature steam unit, and monitor the moisture content of the sludge at the outlet of the second drying treatment unit in real time, and adjust the steam supply flow rate based on the deviation between the actual value and the set value;

[0026] (24) The heat required for sludge drying is calculated based on the actual moisture content of the sludge at the outlet of the second drying treatment unit, the set value of the moisture content of the sludge at the outlet of the third drying treatment unit and the sludge treatment volume, the initial heating capacity of the molten salt heat storage unit is set, and the moisture content of the sludge at the outlet of the third drying treatment unit is monitored in real time, and the heating capacity of the molten salt heat storage unit is adjusted according to the deviation between the actual value and the set value.

[0027] Furthermore, in the step (23), the heat required for sludge drying is calculated as follows: by monitoring the humidity of the sludge at the outlet of the second drying treatment unit and comparing it with the set value, the heating amount of the high-temperature steam unit is adjusted according to the comparison result, and the digital twin technology is used in the adjustment process to estimate the change in steam according to the processing rate and humidity difference, and optimize according to the actual adjustment effect.

[0028] Furthermore, in the step (24), the heat required for sludge drying is calculated as follows: by monitoring the humidity of the sludge at the outlet of the third drying treatment unit and comparing it with the set value, the heating amount of the molten salt heat storage unit is adjusted according to the comparison result, and during the adjustment process, the digital twin technology is used to estimate the heating amount according to the processing rate and humidity difference, and optimize according to the actual adjustment effect.

[0029] Furthermore, the step (3) is specifically as follows: when the amount of sludge accumulation in the transfer bin is small and the sludge treatment rate of the third drying treatment unit is lower than the incinerator blending rate, the set value of the sludge humidity at the outlet of the third drying treatment unit is increased and the sludge blending rate of the incinerator is reduced to make it consistent with the sludge drying treatment rate; when the amount of sludge accumulation in the transfer bin is large and the sludge treatment rate of the third drying treatment unit is not lower than the incinerator blending rate, the set value of the sludge humidity at the outlet of the third drying treatment unit is reduced and the sludge blending rate of the incinerator is increased to make it not lower than the sludge drying treatment rate.

[0030] An electronic device described in the present invention includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is loaded into the processor, any one of the methods for treating sludge in a heat storage waste incineration power plant is implemented.

[0031] A storage medium described in the present invention stores a computer program, and when the computer program is executed by a processor, it is any one of the methods for treating sludge in a heat storage waste incineration power plant.

[0032] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: The present invention is based on photovoltaic power generation, sludge co-combustion, sludge drying, molten salt heat storage and decentralized control to construct a sludge treatment system for a waste incineration power plant that combines renewable energy and heat storage, forming a set of low-carbon, precise and efficient sludge treatment processes, which improves the treatment efficiency of sludge co-combustion, strengthens the sludge treatment capacity of waste incineration power plants, and helps to achieve harmless sludge treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is the system principle diagram of the present invention;

[0034] Figure 2 The present invention is a flow chart of the method. DETAILED DESCRIPTION

[0035] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0036] like Figure 1 As shown, an embodiment of the present invention provides a sludge treatment system for a heat storage waste incineration power plant, including: a photovoltaic power generation unit, an auxiliary heat unit, a first drying treatment unit, a second drying treatment unit, a third drying treatment unit, a transfer bin and an incinerator;

[0037] The photovoltaic power generation unit, the auxiliary heat unit, the first drying treatment unit, the second drying treatment unit, and the third drying treatment unit are connected in sequence; wherein a sludge inlet is arranged above the first drying treatment unit; a sludge outlet is arranged below the third drying treatment unit; the sludge outlet is connected to the transfer bin; the transfer bin is connected to the incinerator; a high-temperature steam unit is arranged above the second drying treatment unit; and a lava steam heat storage unit is arranged above the third drying treatment unit;

[0038] The high-temperature steam unit is connected to the lava steam heat storage unit; sludge humidity sensors are provided at the sludge inlet, the first drying treatment unit outlet, the second drying treatment unit outlet, the third drying treatment unit outlet and the transfer warehouse outlet to monitor the changes in the moisture content of the sludge in each process, determine the drying effect of each sludge drying treatment unit, and the sludge parameters entering the incinerator.

[0039] Among them, the photovoltaic power generation unit is used to convert light energy into electrical energy to supply energy to the auxiliary heating unit;

[0040] The auxiliary heating unit is used to receive the electric energy from the photovoltaic power generation unit and provide heat to the first drying treatment unit, thereby drying the sludge by means of electric heating;

[0041] The high-temperature steam unit is used to dry the sludge by extracting part of the high-temperature steam at the inlet of the steam turbine. One part of the steam is directed to the second drying treatment unit to dry the sludge by direct heat exchange, and the other part is directed to the molten salt heat storage unit to store the heat of the steam.

[0042] The molten salt heat storage unit is used to store the heat of high-temperature steam and supply heat to the third drying treatment unit to dry the sludge through the heat exchange medium;

[0043] The first drying treatment unit is used to receive the cut sludge blocks from the sludge inlet, preliminarily dry the sludge, and transport the sludge to the second drying treatment unit through a conveyor belt;

[0044] The second drying treatment unit is used to receive the sludge delivered by the first drying unit, further dry the sludge using high-temperature steam, and deliver the sludge to the third drying treatment unit via a conveyor belt;

[0045] The third drying treatment unit is used to receive the sludge delivered by the second drying unit, and finally dry the sludge using the heat delivered by the molten salt heat storage unit, and deliver the sludge to the transfer bin through the sludge outlet;

[0046] The transfer bin is used to receive and store the sludge delivered by the third drying treatment unit, and then deliver it to the incinerator after further crushing;

[0047] The incinerator is used to incinerate various types of garbage transported to the power plant, and to harmlessly treat the sludge input from the transfer warehouse by incineration.

[0048] like Figure 2 As shown, an embodiment of the present invention also provides a method for treating sludge in a heat storage waste incineration power plant, comprising the following steps:

[0049] (1) Confirm the amount of sludge to be treated, turbine operating conditions, and weather conditions, and adjust the sludge treatment rate according to the expected output power of photovoltaic power generation;

[0050] (2) A three-stage drying method is used to obtain dried sludge with accurate moisture content; the following steps are included:

[0051] (21) Calculating the heat required for different sludge treatment amounts based on the sludge inlet moisture content and the target sludge moisture content set at the outlet of the first drying treatment unit, and performing preliminary matching based on the output heat of the auxiliary heating unit;

[0052] (22) Monitor the moisture content of the sludge at the outlet of the first drying treatment unit in real time, and adjust the sludge feed rate according to the deviation between the actual value and the set value, so that the moisture content of the sludge at the outlet of the first drying treatment unit reaches the set value;

[0053] (23) According to the actual moisture content of the sludge at the outlet of the first drying treatment unit, the set value of the moisture content of the sludge at the outlet of the second drying treatment unit and the sludge processing volume, the heat required for sludge drying is calculated; the initial flow of the high-temperature steam unit is set, and the moisture content of the sludge at the outlet of the second drying treatment unit is monitored in real time, and the steam supply flow is adjusted according to the deviation between the actual and set values; the heat required for sludge drying is calculated as follows: by monitoring the humidity of the sludge at the outlet of the second drying treatment unit and comparing it with the set value, the heat supply of the high-temperature steam unit is adjusted according to the comparison result, and the digital twin technology is used in the adjustment process to estimate the change in steam according to the processing rate and humidity difference, and optimize according to the actual adjustment effect. The heat required for sludge drying is calculated as follows: by monitoring the humidity of the sludge at the outlet of the third drying treatment unit and comparing it with the set value, the heat supply of the molten salt heat storage unit is adjusted according to the comparison result, and the digital twin technology is used in the adjustment process to estimate the heat supply according to the processing rate and humidity difference, and optimize according to the actual adjustment effect.

[0054] (24) The heat required for sludge drying is calculated based on the actual moisture content of the sludge at the outlet of the second drying treatment unit, the set value of the moisture content of the sludge at the outlet of the third drying treatment unit and the sludge treatment volume, the initial heating capacity of the molten salt heat storage unit is set, and the moisture content of the sludge at the outlet of the third drying treatment unit is monitored in real time, and the heating capacity of the molten salt heat storage unit is adjusted according to the deviation between the actual value and the set value.

[0055] (3) Adjust the sludge blending rate in the incinerator according to the amount of sludge accumulated in the transfer bin, the sludge treatment rate of the third drying treatment unit and the condition that it does not affect the blending condition of the incinerator. Specifically: when the amount of sludge accumulated in the transfer bin is small and the sludge treatment rate of the third drying treatment unit is lower than the blending rate of the incinerator, increase the set value of the sludge humidity at the outlet of the third drying treatment unit and reduce the sludge blending rate of the incinerator to make it consistent with the sludge drying treatment rate; when the amount of sludge accumulated in the transfer bin is large and the sludge treatment rate of the third drying treatment unit is not lower than the blending rate of the incinerator, reduce the set value of the sludge humidity at the outlet of the third drying treatment unit and increase the sludge blending rate of the incinerator to make it not lower than the sludge drying treatment rate.

[0056] An embodiment of the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the computer program is loaded into the processor, any one of the methods for treating sludge in a heat storage waste incineration power plant is implemented.

[0057] An embodiment of the present invention further provides a storage medium storing a computer program, wherein the computer program, when executed by a processor, is a method for treating sludge in a heat storage waste incineration power plant as described in any one of the above.

Claims

1. A sludge treatment system for a heat storage waste incineration power plant, characterized in that: include: Photovoltaic power generation unit, auxiliary heating unit, first drying unit, second drying unit, third drying unit, transfer warehouse and incinerator; The photovoltaic power generation unit, the auxiliary heat unit, the first drying treatment unit, the second drying treatment unit, and the third drying treatment unit are connected in sequence; wherein a sludge inlet is arranged above the first drying treatment unit; a sludge outlet is arranged below the third drying treatment unit; the sludge outlet is connected to the transfer bin; the transfer bin is connected to the incinerator; a high-temperature steam unit is arranged above the second drying treatment unit; and a lava steam heat storage unit is arranged above the third drying treatment unit; The high-temperature steam unit is connected to the lava steam heat storage unit; Among them, the photovoltaic power generation unit is used to convert light energy into electrical energy to supply energy to the auxiliary heating unit; The auxiliary heating unit is used to receive the electric energy from the photovoltaic power generation unit and provide heat to the first drying treatment unit, thereby drying the sludge by means of electric heating; The high-temperature steam unit is used to dry the sludge by extracting part of the high-temperature steam at the inlet of the steam turbine. One part of the steam is directed to the second drying treatment unit to dry the sludge by direct heat exchange, and the other part is directed to the molten salt heat storage unit to store the heat of the steam. The molten salt heat storage unit is used to store the heat of high-temperature steam and supply heat to the third drying treatment unit to dry the sludge through the heat exchange medium; The first drying treatment unit is used to receive the cut sludge blocks from the sludge inlet, preliminarily dry the sludge, and transport the sludge to the second drying treatment unit through a conveyor belt; The second drying treatment unit is used to receive the sludge delivered by the first drying unit, further dry the sludge using high-temperature steam, and deliver the sludge to the third drying treatment unit via a conveyor belt; The third drying treatment unit is used to receive the sludge delivered by the second drying unit, and finally dry the sludge using the heat delivered by the molten salt heat storage unit, and deliver the sludge to the transfer bin through the sludge outlet; The transfer bin is used to receive and store the sludge delivered by the third drying treatment unit, and then deliver it to the incinerator after further crushing; The incinerator is used to incinerate various types of garbage transported to the power plant, and to harmlessly treat the sludge input from the transfer warehouse by incineration; Sludge humidity sensors are installed at the sludge inlet, the first drying treatment unit outlet, the second drying treatment unit outlet, the third drying treatment unit outlet and the transfer warehouse outlet to monitor the changes in the moisture content of the sludge in each process, determine the drying effect of each sludge drying treatment unit, and the sludge parameters entering the incinerator; The sludge treatment method based on the system comprises the following steps: (1) Confirm the amount of sludge to be treated, turbine operating conditions, and weather conditions, and adjust the sludge treatment rate according to the expected output power of photovoltaic power generation; (2) A three-stage drying method is used to obtain dried sludge with accurate moisture content; the following steps are included: (21) Calculating the heat required for different sludge treatment amounts based on the sludge inlet moisture content and the target sludge moisture content set at the outlet of the first drying treatment unit, and performing preliminary matching based on the output heat of the auxiliary heating unit; (22) Monitor the moisture content of the sludge at the outlet of the first drying treatment unit in real time, and adjust the sludge feed rate according to the deviation between the actual value and the set value, so that the moisture content of the sludge at the outlet of the first drying treatment unit reaches the set value; (23) Calculate the heat required for sludge drying according to the actual moisture content of the sludge at the outlet of the first drying treatment unit, the set value of the moisture content of the sludge at the outlet of the second drying treatment unit and the sludge processing volume; set the initial flow of the high-temperature steam unit, and monitor the moisture content of the sludge at the outlet of the second drying treatment unit in real time, and adjust the steam supply flow according to the deviation between the actual value and the set value; wherein, the heat required for sludge drying is calculated as follows: monitor the humidity of the sludge at the outlet of the second drying treatment unit and compare it with the set value, adjust the heat supply of the high-temperature steam unit according to the comparison result, use digital twin technology in the adjustment process, estimate the change in steam according to the processing rate and humidity difference, and optimize according to the actual adjustment effect; (24) Calculate the heat required for sludge drying according to the actual moisture content of the sludge at the outlet of the second drying treatment unit, the set value of the moisture content of the sludge at the outlet of the third drying treatment unit and the sludge processing volume, set the initial heating capacity of the molten salt heat storage unit, monitor the moisture content of the sludge at the outlet of the third drying treatment unit in real time, and adjust the heating capacity of the molten salt heat storage unit according to the deviation between the actual value and the set value; wherein, the heat required for sludge drying is calculated as follows: monitor the humidity of the sludge at the outlet of the third drying treatment unit and compare it with the set value, adjust the heating capacity of the molten salt heat storage unit according to the comparison result, use digital twin technology in the adjustment process, estimate the heating capacity according to the processing rate and humidity difference, and optimize according to the actual adjustment effect; (3) Adjusting the sludge blending rate in the incinerator according to the amount of sludge accumulation in the transfer bin and the sludge treatment rate of the third drying treatment unit; specifically as follows: when the amount of sludge accumulation in the transfer bin is small and the sludge treatment rate of the third drying treatment unit is lower than the blending rate of the incinerator, increase the set value of the sludge humidity at the outlet of the third drying treatment unit and reduce the sludge blending rate of the incinerator to make it consistent with the sludge drying treatment rate; when the amount of sludge accumulation in the transfer bin is large and the sludge treatment rate of the third drying treatment unit is not lower than the blending rate of the incinerator, reduce the set value of the sludge humidity at the outlet of the third drying treatment unit and increase the sludge blending rate of the incinerator to make it not lower than the sludge drying treatment rate.

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