阅读说明：本技术 一种基于喷雾蒸发废水处理技术的废水供给自动调节装置及方法 (Automatic wastewater supply adjusting device and method based on spray evaporation wastewater treatment technology ) 是由 王先董 朱军超 张亮 戴尚访 张威 俞峰苹 于 2020-06-03 设计创作，主要内容包括：本发明涉及基于喷雾蒸发废水处理技术的废水供给自动调节装置,包括废水供给箱、废水供给泵、回流调节电动阀、出口烟道、喷雾干燥塔、雾化器和进口烟道；所述喷雾干燥塔设有进口烟道和出口烟道；废水供给箱出口管道连接废水供给泵,废水供给泵出口管道分两个支路,一路为供水管路,连接至喷雾干燥塔内的雾化器,另一路为回流管路,连接至废水供给箱进口管道,回流管路上设有回流调节电动阀。本发明的有益效果是：本发明采用回流调节的方式,并配合有边界条件的PID自动控制系统,减小了喷雾干燥塔出口烟温的震荡,降低了塔内废水未蒸干导致湿灰的风险。(The invention relates to a waste water supply automatic regulating device based on a spray evaporation waste water treatment technology, which comprises a waste water supply box, a waste water supply pump, a reflux regulation electric valve, an outlet flue, a spray drying tower, an atomizer and an inlet flue, wherein the inlet flue is communicated with the spray drying tower; the spray drying tower is provided with an inlet flue and an outlet flue; the waste water supply tank outlet pipeline is connected with a waste water supply pump, the waste water supply pump outlet pipeline is divided into two branches, one branch is a water supply pipeline and is connected to an atomizer in the spray drying tower, the other branch is a return pipeline and is connected to a waste water supply tank inlet pipeline, and a return adjusting electric valve is arranged on the return pipeline. The invention has the beneficial effects that: the invention adopts a reflux regulation mode and is matched with a PID automatic control system with boundary conditions, thereby reducing the shock of the smoke temperature at the outlet of the spray drying tower and reducing the risk of wet ash caused by non-evaporation of the wastewater in the tower.)

1. The utility model provides a waste water supply automatic regulating apparatus based on spray evaporation waste water treatment technique which characterized in that: comprises a wastewater supply box (1), a wastewater supply pump (2), a reflux adjusting electric valve (3), an outlet flue (4), a spray drying tower (5), an atomizer (6) and an inlet flue (7); the spray drying tower (5) is provided with an inlet flue (7) and an outlet flue (4); the waste water supply tank (1) outlet pipeline is connected with the waste water supply pump (2), the waste water supply pump (2) outlet pipeline is divided into two branches, one branch is a water supply pipeline and is connected to an atomizer (6) in the spray drying tower (5), the other branch is a return pipeline and is connected to an inlet pipeline of the waste water supply tank (1), and a return flow adjusting electric valve (3) is arranged on the return pipeline.

2. The automatic wastewater supply regulating apparatus based on a spray evaporation wastewater treatment technique according to claim 1, characterized in that: the system also comprises an adjusting control system, wherein a 2XMTR module, a PID module and a MAStation module in a control loop of the adjusting control system are sequentially connected.

3. A control method of an automatic wastewater supply regulating apparatus based on a spray evaporation wastewater treatment technique according to claim 1, comprising the steps of:

s1, inputting the temperature values of the two drying tower outlet flue gases into a 2XMTR module, averaging the temperature values of the two drying tower outlet flue gases by the 2XMTR module, wherein the average value of the 2XMTR module is a process value PV of the temperature values of the drying tower outlet flue gases;

s2, subtracting the process value PV of the drying tower outlet flue gas temperature value and the set value SP of the drying tower outlet flue gas temperature value to obtain an offset value;

s3, after the deviation value in the step S2 is calculated by a PID (proportion integration differentiation) module in the control loop, outputting an opening instruction to the reflux regulation electric valve (3);

s4, the opening instruction in the step S3 is operated by an MA Station module in the control loop, whether the boundary condition f (x) is met or not is judged, and if the boundary condition f (x) is met, namely the opening value is larger than the output value of the boundary condition f (x), the opening instruction is output; if not, the opening value is smaller than the output value of the boundary condition f (x), the output value of f (x) is applied to the electric valve (3) for reflux regulation.

4. The method for controlling an automatic wastewater supply regulation apparatus based on a spray evaporation wastewater treatment technique according to claim 3, characterized in that: the adjustment control method of step S3: when the process value PV of the temperature value of the flue gas at the outlet of the drying tower is larger than the set value SP of the temperature value of the flue gas at the outlet of the drying tower, the water supply amount in the tower needs to be increased, an instruction for reducing the opening value of the reflux adjusting electric valve is output at the moment, the pumping force of the wastewater supply pump is unchanged, the reflux water amount is reduced, and the water supply amount in the tower is increased; when the process value PV of the drying tower outlet flue gas temperature value is smaller than the set value SP of the drying tower outlet flue gas temperature value, the water supply amount in the tower needs to be reduced, an instruction for increasing the opening value of the reflux adjusting electric valve is output at the moment, the pumping force of the wastewater supply pump is unchanged, the reflux water amount is increased, and the water supply amount in the tower is reduced.

5. The method for controlling an automatic wastewater supply regulation apparatus based on a spray evaporation wastewater treatment technique according to claim 3, characterized in that: the boundary condition f (x) of step S4 is a fitting function of the load and the treated water amount, and the treated water amount is the theoretical maximum treated water amount calculated according to the system heat conservation under the load.

Technical Field

The invention relates to an automatic wastewater supply adjusting device based on a spray evaporation wastewater treatment technology, and belongs to the technical field of energy.

Background

At present, the desulfurization wastewater spray evaporation technology which is started to be applied to a thermal power generating unit is to make a bypass from an SCR outlet, introduce flue gas into a spray drying tower to be used as a heat source, and control the outlet flue gas temperature of the spray drying tower to be a certain fixed value under the condition that the load of the unit is changed, so that the wastewater is ensured to be fully evaporated to dryness, and meanwhile, the influence on an air preheater and electric dust removal is reduced. Because the spray drying tower is installed at a high position, the requirement on the water supply lift is high, the temperature change of the outlet smoke is slow, and the controlled object has large inertia and serious lag.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide the automatic wastewater supply adjusting device and the automatic wastewater supply adjusting method based on the spray evaporation wastewater treatment technology, which are reasonable in design and reliable in performance.

The automatic wastewater supply adjusting device based on the spray evaporation wastewater treatment technology comprises a wastewater supply box, a wastewater supply pump, a reflux adjusting electric valve, an outlet flue, a spray drying tower, an atomizer and an inlet flue; the spray drying tower is provided with an inlet flue and an outlet flue; the waste water supply tank outlet pipeline is connected with a waste water supply pump, the waste water supply pump outlet pipeline is divided into two branches, one branch is a water supply pipeline and is connected to an atomizer in the spray drying tower, the other branch is a return pipeline and is connected to a waste water supply tank inlet pipeline, and a return adjusting electric valve is arranged on the return pipeline.

Preferably, the method comprises the following steps: the system also comprises an adjusting control system, wherein a 2XMTR module, a PID module and an MA Station module in a control loop of the adjusting control system are sequentially connected.

The control method of the automatic wastewater supply adjusting device based on the spray evaporation wastewater treatment technology comprises the following steps:

s1, inputting the temperature values of the two drying tower outlet flue gases into a 2XMTR module, averaging the temperature values of the two drying tower outlet flue gases by the 2XMTR module, wherein the average value of the 2XMTR module is a process value PV of the temperature values of the drying tower outlet flue gases;

s2, subtracting the process value PV of the drying tower outlet flue gas temperature value and the set value SP of the drying tower outlet flue gas temperature value to obtain an offset value;

s3, after the deviation value in the step S2 is calculated by a PID (proportion integration differentiation) module in the control loop, outputting an opening instruction of the reflux regulation electric valve;

s4, the opening instruction in the step S3 is operated by an MA Station module in the control loop, whether the boundary condition f (x) is met or not is judged, and if the boundary condition f (x) is met, namely the opening value is larger than the output value of the boundary condition f (x), the opening instruction is output; if not, the opening value is smaller than the output value of the boundary condition f (x), then the output value of f (x) is applied to the electric valve for reflux regulation.

Preferably, the method comprises the following steps: the adjustment control method of step S3 is as follows:

when the process value PV of the temperature value of the flue gas at the outlet of the drying tower is larger than the set value SP of the temperature value of the flue gas at the outlet of the drying tower, the water supply amount in the tower needs to be increased, at the moment, an instruction for reducing the opening value of the reflux adjusting electric valve is output, the pumping force of the wastewater supply pump is unchanged, the reflux water amount is reduced, and the water supply amount in the tower is increased; when the process value PV of the drying tower outlet flue gas temperature value is smaller than the set value SP of the drying tower outlet flue gas temperature value, the water supply amount in the tower needs to be reduced, at the moment, an instruction for increasing the opening value of the reflux adjusting electric valve is output, the pumping force of the wastewater supply pump is unchanged, the reflux water amount is increased, and the water supply amount in the tower is reduced.

Preferably, the method comprises the following steps: the boundary condition f (x) of step S4 is a fitting function of the load and the treated water amount, and the treated water amount is the theoretical maximum treated water amount calculated according to the system heat conservation under the load.

The invention has the beneficial effects that: the invention adopts a reflux regulation mode and is matched with a PID automatic control system with boundary conditions, thereby reducing the shock of the smoke temperature at the outlet of the spray drying tower and reducing the risk of wet ash caused by non-evaporation of the wastewater in the tower.

Drawings

FIG. 1 is a schematic view of the apparatus;

FIG. 2 is a schematic diagram of the system control of the present apparatus.

Description of reference numerals: the device comprises a wastewater supply tank 1, a wastewater supply pump 2, a reflux adjusting electric valve 3, an outlet flue 4, a spray drying tower 5, an atomizer 6 and an inlet flue 7.

Detailed Description

The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

As shown in fig. 1, the automatic wastewater supply adjusting device based on the spray evaporation wastewater treatment technology comprises a wastewater supply tank 1, a wastewater supply pump 2, a reflux adjusting electric valve 3, a spray drying tower 5, an atomizer 6, an inlet flue 7 and an outlet flue 4, wherein the outlet of the wastewater supply pump 2 is connected with the wastewater supply tank 1 through a pipeline, the outlet pipeline of the wastewater supply pump 2 is divided into two branches, one branch is a water supply pipeline and is connected to the atomizer 6 in the spray drying tower 5, the other branch is a reflux pipeline and is connected to the wastewater supply tank 1, and the reflux adjusting electric valve 3 is arranged on the reflux pipeline.

The control method of the automatic wastewater supply adjusting device based on the spray evaporation wastewater treatment technology comprises the following steps:

s1, after the preset drying tower outlet smoke temperature value is input, the smoke temperature PID controller is matched with f (x) boundary conditions to control the water quantity of the return pipeline, so that the waste water quantity entering the spray drying tower 5 is adjusted, the spray drying tower 5 outlet smoke temperature is controlled, and the current spray drying tower outlet smoke temperature value is displayed through a thermocouple.

And S2, when the temperature of the smoke at the outlet of the spray drying tower is lower than the preset smoke temperature value, increasing the opening of the reflux adjusting electric valve 3 on the reflux pipeline at the outlet of the wastewater supply pump 2, increasing the amount of reflux water, reducing the amount of water entering the spray drying tower 5, and increasing the temperature of the smoke at the outlet of the spray drying tower.

And S3, when the temperature of the smoke at the outlet of the spray drying tower is higher than the preset smoke temperature value, reducing the opening of the reflux adjusting electric valve 3 on the reflux pipeline at the outlet of the wastewater supply pump 2, reducing the reflux water flow, increasing the water flow entering the spray drying tower 5, and reducing the temperature of the smoke at the outlet of the spray drying tower.

S4, when the smoke temperature PID control reduces the opening of the reflux adjusting electric valve to f (x) boundary condition value, if the PID module continues to output the instruction for reducing the opening of the reflux adjusting electric valve, the instruction does not act on the reflux adjusting electric valve 3 any more, and the reflux adjusting electric valve 3 is controlled by the f (x) boundary condition instruction.

This patent is with drying tower export gas temperature control in the within range that is close to the settlement gas temperature to avoided effectively when drying tower export gas temperature is higher than the settlement temperature and the deviation is great, the tower water yield surge leads to waste water can't be by the complete evaporation to dryness risk that wet ash appears.