CN212532613U

CN212532613U - Desulfurization waste water zero release processing apparatus

Info

Publication number: CN212532613U
Application number: CN202020998748.6U
Authority: CN
Inventors: 游在鑫; 王建明; 刘伟; 安志兰
Original assignee: Shandong Qingshuo Environmental Science And Technology Co ltd
Current assignee: Shandong Qingshuo Environmental Science And Technology Co ltd
Priority date: 2020-06-04
Filing date: 2020-06-04
Publication date: 2021-02-12
Anticipated expiration: 2030-06-04

Abstract

The utility model discloses a desulfurization wastewater zero-discharge treatment device, which comprises an integrated pretreatment system, a double-alkali softening system, a low-temperature flue gas waste heat evaporation concentration system and an electrolytic chlorine production system which are connected in sequence; the low-temperature flue gas waste heat evaporation concentration system comprises a wastewater feed pump connected with the double-alkali softening system, the wastewater feed pump is connected with an evaporation concentrator, and the evaporation concentrator is provided with a circulating pump; the electrolytic chlorine production system comprises an electrolytic cell feed pump connected with the evaporation concentrator, the electrolytic cell feed pump is connected with a filter, the filter is connected with an electrolytic cell, the electrolytic cell is connected with a sodium hypochlorite buffer tank, and the sodium hypochlorite buffer tank is connected with a dosing pump. The device treats a large amount of low-grade flue gas waste heat generated by a power plant as a heat source to desulfurize high-concentration high-salt-content wastewater, and uses the desulfurated wastewater as a raw material for producing chlorine by electrolysis, so that the cost is low, the energy consumption is low, the cyclic utilization of resources is realized, and a large amount of production cost is saved for enterprises.

Description

Desulfurization waste water zero release processing apparatus

Technical Field

The utility model relates to a coal fired power plant desulfurization waste water treatment and resource cyclic utilization technical field, concretely relates to utilize processing apparatus of flue gas waste heat evaporative concentration and cooperation electrolysis system chlorine recovery resource.

Background

Limestone-gypsum wet desulphurization is the mainstream desulphurization process of various coal-fired power plants at present, and the process can generate desulphurization wastewater with high salt content, and the Cl & lt- & gt concentration can reach 20000mg/L at most. With the promulgation and implementation of the national water pollution prevention and control action plan, more and more thermal power plants need zero-emission treatment of desulfurization wastewater. At present, the zero discharge treatment of the desulfurization wastewater mainly adopts the process of combining pretreatment, membrane concentration and evaporative crystallization or combining pretreatment, membrane concentration and flue evaporation.

The evaporation crystallization treatment process is mature in technology, but high in investment, high in operating cost and low in quality of crystallized salt. Although the flue evaporation treatment process has low investment, the technical maturity is not high, and the operation is not stable enough.

How to develop a desulfurization device with low cost, low energy consumption and stable operation is a technical problem which is urgently needed to be solved at present in the desulfurization industry.

SUMMERY OF THE UTILITY MODEL

In view of the above problem, the utility model discloses a desulfurization waste water zero discharge system that utilizes flue gas waste heat evaporative concentration and cooperation electrolysis chlorine production with low costs, low energy consumption, resource cyclic utilization.

A desulfurization wastewater zero-emission treatment device comprises an integrated pretreatment system, a double-alkali softening system, a low-temperature flue gas waste heat evaporation and concentration system and an electrolytic chlorine production system which are sequentially connected; the low-temperature flue gas waste heat evaporation concentration system comprises a wastewater feed pump connected with a double-alkali softening system, the wastewater feed pump is connected with an evaporation concentrator, and the evaporation concentrator is provided with a circulating pump; the electrolytic chlorine production system comprises an electrolytic cell feeding pump connected with the evaporation concentrator, the electrolytic cell feeding pump is connected with a filter, the filter is connected with an electrolytic cell, the electrolytic cell is connected with a sodium hypochlorite buffer tank, and the sodium hypochlorite buffer tank is connected with a dosing pump.

Preferably, the electrolytic cell is provided with a rectifying device.

Preferably, an anode and a cathode are arranged in the electrolytic cell, the anode is a titanium-based coating, and the cathode is a stainless steel plate.

The utility model has the advantages that:

1. the utility model provides an utilize desulfurization waste water evaporative concentration + electrolysis system chlorine device of low temperature flue gas waste heat, application scope is wide, handles desulfurization high concentration high salt waste water as the heat source to a large amount of low-grade flue gas waste heat that the power plant produced to be used for the raw materials of electrolysis system chlorine with desulfurization waste water, with low costs, the energy consumption is low, realized the cyclic utilization of resource, saved a large amount of manufacturing cost for the enterprise.

2. The utility model discloses the sodium hypochlorite solution that well electrolysis system chlorine device prepared can regard as the germicide that the circulating water of power plant handled to use, has practiced thrift the resource, has realized the cyclic utilization of discarded object resource.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of the overall structure of the present invention;

in the figure, 1, an integrated pretreatment system, 2, a double-alkali method softening system, 3, a low-temperature flue gas waste heat evaporation concentration system, 4, an electrolytic chlorine production system, 5, a circulating pump, 6, an electrolytic cell feed pump, 7, a filter, 8, an electrolytic cell, 9, a rectification device, 10, a sodium hypochlorite buffer tank, 11, a dosing pump, 12, a wastewater feed pump, 13 and an evaporation concentrator.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present invention, it should be understood that the terms "inside", "outside", "left" and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

The utility model discloses a desulfurization waste water zero release processing apparatus as shown in figure 1, the device carries out the process flow of desulfurization waste water zero release and is: the wastewater from the desulfurization system enters an integrated pretreatment system 1 → a double alkali softening system 2 → a low-temperature flue gas waste heat evaporation and concentration system 3 → an electrolytic chlorine production system 4.

Desulfurization waste water integration pretreatment systems: wastewater generated by a desulfurization system enters a desulfurization wastewater integrated pretreatment device, an integrated high-efficiency adsorption flocculant is added into the wastewater for reaction, and the slurry is fully coagulated, precipitated and clarified through the treatment of an internal special structure of the device to remove harmful substances such as COD (chemical oxygen demand), phosphorus, SS (suspended substances), heavy metals and the like in the wastewater; and pumping the underflow sludge to a vacuum belt dehydrator of a desulfurization system through a sludge pump for dehydration, mixing the dehydrated underflow sludge with the desulfurized gypsum, and carrying out outward transportation treatment.

The double-alkali softening system comprises: feeding the desulfurization wastewater from the clear water tank into a mechanical stirring clarifier, adding a sodium carbonate solution with a certain concentration into the clarifier, adding a sodium hydroxide alkali liquor to keep a certain pH value, so that Ca2+ and Mg2+ in the water form CaCO3 precipitate and Mg (OH)2 precipitate, and softening the desulfurization wastewater to ensure that the total hardness is below 20Mg/L (0.4mmol/LCaCO 3). And (3) conveying the precipitate to a pretreatment system by using a sludge conveying pump for repeated treatment, and automatically flowing supernatant generated by the mechanical stirring clarifier into a clean water tank to be used as inlet water of a subsequent low-temperature flue gas waste heat concentration system.

The low-temperature flue gas waste heat evaporation and concentration system comprises: establish the concentrated bypass of evaporation all the way in the entry flue department before the desulfurizing tower, establish an evaporation concentrator 13 on the bypass, the evaporation concentrator is similar to the wet flue gas desulfurizing tower, and the desulfurization waste water after the softening of two alkali method system 2 passes through waste water feed pump 12 and sends to the bottom of evaporation concentrator 13, in circulating pump 5 with the waste water continuous cycle spray of evaporation concentrator bottom to the flue gas, utilizes the low temperature flue gas of 120 ℃ or so before the desulfurization with waste water evaporation concentration. The flue gas flowing through the concentrator returns to a front inlet flue of the desulfurizing tower after passing through the demisting device, and the mixed raw flue gas enters the desulfurizing tower; the concentrated wastewater in the concentrator enters a PH regulating box through a pump for conditioning, and then is pumped to an electrolytic chlorine production system through an electrolytic cell feeding pump 6.

Electrolytic chlorine production system: the electrolysis trough feed pump 6 filters the desulfurization waste water after the concentration through filter 7 and sends into in the electrolysis trough 8 through the booster pump, the electrolysis trough uses titanium base coating electrode as the positive pole, corrosion resistant plate is the negative pole, and dispose rectification equipment, turn into the alternating current by rectification equipment 9 and provide the electrolysis trough with the direct current, carry out electrolytic treatment with the desulfurization waste water of the electrolysis trough of flowing through, the sodium hypochlorite solution and the accessory substance hydrogen that produce get into sodium hypochlorite buffer tank 10, discharge to the atmosphere after diluting accessory substance hydrogen in the sodium hypochlorite buffer tank. The sodium hypochlorite solution is conveyed to a chlorination frame of a coarse grid of the circulating water filtering system through a dosing pump 11 to be used as a bactericide of circulating water.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A desulfurization wastewater zero-discharge treatment device is characterized by comprising an integrated pretreatment system, a double-alkali softening system, a low-temperature flue gas waste heat evaporation and concentration system and an electrolytic chlorine production system which are sequentially connected; the low-temperature flue gas waste heat evaporation concentration system comprises a wastewater feed pump connected with a double-alkali softening system, the wastewater feed pump is connected with an evaporation concentrator, and the evaporation concentrator is provided with a circulating pump; the electrolytic chlorine production system comprises an electrolytic cell feeding pump connected with the evaporation concentrator, the electrolytic cell feeding pump is connected with a filter, the filter is connected with an electrolytic cell, the electrolytic cell is connected with a sodium hypochlorite buffer tank, and the sodium hypochlorite buffer tank is connected with a dosing pump.

2. The desulfurization waste water zero-discharge treatment device of claim 1, wherein the electrolytic bath is provided with a rectification device.

3. The desulfurization wastewater zero-emission treatment device of claim 1, wherein an anode and a cathode are arranged in the electrolytic cell, the anode is a titanium-based coating, and the cathode is a stainless steel plate.