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Method and device for recovering waste water from incineration plant
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A complete set of equipment and recovery method technology, applied in separation methods, chemical instruments and methods, permeation/dialysis water/sewage treatment, etc., can solve problems such as difficulty in controlling the dosing of exhaust gas treatment, unstable exhaust temperature, and rising costs , to achieve stable and efficient treatment, stable and efficient heat recovery
Active Publication Date: 2019-04-16
KURITA WATER INDUSTRIES LTD
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[0014] In the conventional method, since the temperature of the exhaust gas after the cooling device is unstable and unpredictable, it is also difficult to control the chemical dosing for the exhaust gas treatment. processing, thus becoming the cause of cost increase
[0015] In this way, in the conventional method, the control of the amount of water sent to the cooling device is not performed, and the temperature at the outlet of the cooling device fluctuates. Therefore, there is a problem that stable treatment cannot be performed in the exhaust gas treatment device in the subsequent stage, and it is necessary to carry out Reheating of exhaust gas, resulting in poor thermal efficiency
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Embodiment 1
[0113] exist figure 1 The shown combustible waste incineration plant operates under the following conditions.
[0114] Heat recovery unit 2 outlet temperature: 230°C
[0115] Cooling device 3 outlet temperature: 188°C
[0116] The temperature difference between the outlet temperature of the heat recovery device 2 and the outlet temperature of the cooling device 3: 42°C
[0117] Boiler discharge water, cooling towerdischarge water, miscellaneous drainage, domestic drainage, car washing drainage and floor cleaning drainage discharged from the complete set of incineration equipment according to the following flow rates image 3 process to handle.
[0149] In the case of slaked lime treatment, the exhaust temperature is preferably 150°C to 170°C. Therefore, the water recovery rate of the RO membrane separation device 12 is set to 65% and the RO concentrated water volume is 0.58m 3 / hr, set the water supply to the cooling device as 0.85m 3 / hr, the temperature at the outlet of the cooling device was controlled to be 170°C (the temperature difference between the outlet temperature of the heat recovery device 2 and the outlet temperature of the cooling device 3: 60°C), and the same process as in Example 1 was performed except that .
[0150] As a result, a slight reheating was required in the catalytic denitration device, but otherwise, the same efficient treatment as in Example 1 was perfor...
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Abstract
The present invention efficiently recovers heat from flue gas in an incinerationplant and to achieve stable and efficient treatment of the flue gas. Waste water discharged from an incineration plantis subjected to water treatment by a water treatment device 6, the incinerationplant being equipped with: an incineration device 1; a heat recovery device 2 for recovering heat from flue gas; a temperature lowering device 3 for further lowering the temperature of the flue gas having undergone heat recovery at the heat recovery device 2; a dust collector 4 for removing dust from the flue gas having undergone temperature-lowering; and a catalytic denitrification device 5. The treated water is delivered to the temperature lowering device 3 and injected into the flue gas so as to be evaporated toachieve lowering of the temperature of the flue gas. A control device 7 controls the amount of water to be delivered from the water treatment device 6 to the temperature lowering device 3 so that thetemperature of the flue gas at the outlet of the temperature lowering device 3 is 150-200 DEG C.
Description
technical field [0001] The present invention relates to a method and a device for recovering wastewater discharged from an incineration plant. Background technique [0002] As a treatment method for wastewater discharged from an incineration plant, which includes an incinerator for burning organic matter, a wastewater treatment method in which the wastewater is coagulated with a coagulant or the like, and then filtered, etc., etc. are known, etc. A heat recovery device for recovering the heat of the combustionexhaust gas discharged from the incinerator, and a cooling device for further reducing the temperature of the combustionexhaust gas that has been heat recovered. [0003] There is also known a wastewater treatment method in which wastewater discharged from an incineration plant is coagulated with a coagulant or the like, followed by biological treatment, and then filtered through sand filtration (Patent Document 1). Patent Document 1 describes that most of the purifi...
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