Low-temperature exhaust heat concentration system and method utilizing wastewater of thermal power plant

A concentration system, low-temperature waste heat technology, applied in the direction of gaseous effluent wastewater treatment, etc., can solve the problems of high flue gas temperature, flue evaporation stroke, shutdown or demolition, waste water damage, etc., to achieve a small footprint and easy operation Reliable, low energy consumption for operation

Pending Publication Date: 2017-02-22
四川苏源环保工程有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Although this evaporation method has a simple system and low investment and energy consumption, it has high requirements on the temperature of the flue gas and the evaporation process in the flue; if the evaporation conditions are not met, the waste

Method used

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  • Low-temperature exhaust heat concentration system and method utilizing wastewater of thermal power plant
  • Low-temperature exhaust heat concentration system and method utilizing wastewater of thermal power plant
  • Low-temperature exhaust heat concentration system and method utilizing wastewater of thermal power plant

Examples

Experimental program
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Effect test

Example Embodiment

[0039] Example one

[0040] Such as figure 1 with figure 2 As shown, the low-temperature waste heat concentration system of thermal power plant wastewater includes a dust collector 1 (electric precipitator can be used) to remove dust from the flue gas discharged from a boiler, a desulfurization absorption tower 2 to desulfurize the flue gas after dust removal, and a storage desulfurization absorption The waste water collection box 3 for the waste water produced by the tower 2 and the pretreatment device 4 for pretreating the waste water in the waste water collection box 3; wherein, the dust collector, the desulfurization absorption tower, and the pretreatment device can be well-known and commonly used in the prior art The equipment realizes its corresponding functions, which will not be repeated here; it also includes:

[0041] The wastewater preheating device 5 uses the flue gas heat in the flue between the dust collector 1 and the desulfurization absorption tower 2 to preheat th...

Example Embodiment

[0048] Example two

[0049] Such as image 3 with Figure 4 As shown, the thermal power plant waste water low-temperature waste heat concentration system in this embodiment has basically the same structure and principle as the first embodiment, and the similarities will not be repeated here. The only difference is:

[0050] In this embodiment, the wastewater preheating device 5 adopts a direct preheating method, that is, the wastewater that has undergone pretreatment such as neutralization, precipitation, flocculation, clarification, etc. flows directly through the set between the dust collector 1 and the desulfurization absorption tower 2. The coil 53 in the flue is preheated, and then enters the evaporative concentration tower for evaporative concentration. However, this method requires strict control of the preheating temperature of the wastewater (40-50℃). If the preheating temperature is too high, Ca( HCO 3 ) 2 And Mg(HCO 3 ) 2 It is decomposed by heat in the coil to cause se...

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Abstract

The invention belongs to the technical field of wastewater treatment of a thermal power plant and particularly relates to a low-temperature exhaust heat concentration system and method utilizing wastewater of a thermal power plant. The system comprises a dust removal device, a desulfurizing absorption tower, a wastewater collecting tank, a pretreatment device, a wastewater preheating device and an evaporation concentration tower, wherein the wastewater preheating device preheats pretreated wastewater by use of flue gas heat in a flue between the dust removal device and the desulfurizing absorption tower; the evaporation concentration tower is used for evaporating the preheated wastewater at the low temperature and comprises a tower body, an atomizing device connected with a wastewater outlet of the wastewater preheating device is arranged in the tower body, and multiple filler layers are arranged below the atomizing device and in the tower body; an air inlet is formed in the lower part of the tower body and connected with a blower, and an air outlet is formed in the upper part of the tower body; a wastewater concentration circulating system is arranged at the bottom of the tower body. The system is simple in overall design, reliable to operate, low in operation energy consumption and lower in investment cost and occupies a small area.

Description

technical field [0001] The invention belongs to the technical field of thermal power plant wastewater treatment, and in particular relates to a thermal power plant wastewater low-temperature waste heat concentration system and a concentration method. Background technique [0002] Limestone-gypsum wet desulfurization technology is currently the most widely used flue gas desulfurization technology in thermal power plants. During the operation of the desulfurization device, a large amount of wastewater is regularly discharged, that is, desulfurization wastewater. The wastewater has the characteristics of high concentration of suspended solids, high concentration of inorganic salts and heavy metal ions. [0003] Traditional desulfurization wastewater treatment process chemical dosing method: traditional chemical treatment methods of neutralization, precipitation, flocculation, concentration and clarification are often used for treatment. Although it can reduce the content of he...

Claims

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Application Information

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IPC IPC(8): C02F1/16C02F103/18
CPCC02F1/16C02F2103/18
Inventor 代旭东曲守信赵金田健范玺
Owner 四川苏源环保工程有限公司
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