CN219217702U

CN219217702U - Demineralized water ammonia adding system

Info

Publication number: CN219217702U
Application number: CN202223498443.7U
Authority: CN
Inventors: 王力锋; 贺英伦; 范婷婷; 范智源; 张壮; 杨春亮; 王旭
Original assignee: Ningbo Golden Hair New Materials Co ltd
Current assignee: Ningbo Golden Hair New Materials Co ltd
Priority date: 2022-12-27
Filing date: 2022-12-27
Publication date: 2023-06-20
Anticipated expiration: 2032-12-27

Abstract

The utility model relates to a demineralized water ammonia adding system, which comprises: the ammonia adding mixing tank is used for mixing desalted water with ammonia water and is provided with a first liquid inlet, a second liquid inlet and a first liquid outlet; the desalted water input pipeline is connected with the first liquid inlet; the desalted water output pipeline is connected with the first liquid outlet; the inlet of the ammonia water conveying pipeline is communicated with an ammonia water preparation system of the water-coal slurry boiler device, the outlet of the ammonia water conveying pipeline is communicated with a second liquid inlet of the ammonia adding mixing tank, and a control valve for controlling the flow of the pipeline is further arranged in the ammonia water conveying pipeline. After the desalted water ammonia adding system is transformed and put into use, two operation links of replacing the steel cylinder in the ammonia adding room of the chemical water treatment station and preparing ammonia water, which have the risk of ammonia leakage, are removed, and the fixed dangerous point for storing and using the liquid ammonia steel cylinder is not existed, so that the purchase and system maintenance cost of the liquid ammonia steel cylinder are saved.

Description

Demineralized water ammonia adding system

Technical Field

The utility model relates to the technical field of demineralized water treatment, in particular to a demineralized water ammonia adding system.

Background

Industrial boiler water is generally subjected to a series of filtering and desalting operations, and then high-purity desalted water can be obtained. However, after the desalted water is purified, the pH value is generally between 6 and 7, and acid corrosion is easily caused to pipelines and equipment. The key problem in controlling corrosion of the boiler water supply system is to stably adjust the pH value of the water supply system, and in order to prevent corrosion of the water supply system, the national standard requires that the pH value of the water supply system of the boiler should be controlled within the range of 8.8-9.3. In order to avoid corrosion of subsequent equipment or piping metal parts caused by pH reduction due to dissolution of CO2 in the air into the water. The chemical water treatment station is provided with a combined ammonia adding device, which is generally arranged in an ammonia adding room of the chemical water treatment station, and ammonia water is added into the desalted water, so that the pH value of the output desalted water can be ensured to be 8.8-9.3. However, during daily operation, operators need to pay attention to observe the liquid level of the ammonia water tank, and manual preparation is needed when the liquid level is lower than 1/5, wherein the ammonia water tank is prepared by liquid ammonia and desalted water, and the original design of the liquid ammonia source is outsourcing liquid ammonia steel cylinders (the frequency is about once in a quarter).

Because the amount of ammonia used for adjusting the PH of demineralized water of the water supply boiler is less (about 50L/h), and the steel bottle belongs to a pressure vessel, the steel bottle needs to be checked regularly, the forklift is adopted for loading and unloading replacement in the operation process, and after the steel bottle is placed and fixed, the butt joint pipeline is introduced into the ammonia water solution tank for preparing ammonia water, so that the operation mode is very complicated, and a certain risk exists.

Therefore, there is a need for further improvements in existing demineralized water ammonia systems.

Disclosure of Invention

Aiming at the current state of the art, the utility model provides a demineralized water ammonia adding system which is convenient to operate and high in safety.

The technical scheme adopted for solving the technical problems is as follows: a demineralized water ammonia-adding system, comprising:

the ammonia adding mixing tank is used for mixing desalted water and ammonia water and is provided with a first liquid inlet for inputting desalted water into the ammonia adding mixing tank, a second liquid inlet for inputting ammonia water into the ammonia adding mixing tank and a first liquid outlet for discharging desalted water mixed with ammonia water;

the desalted water input pipeline is connected with the first liquid inlet;

the desalted water output pipeline is connected with the first liquid outlet;

the inlet of the ammonia water conveying pipeline is communicated with an ammonia water preparation system of the water-coal slurry boiler device, the outlet of the ammonia water conveying pipeline is communicated with a second liquid inlet of the ammonia adding mixing tank, and a control valve for controlling the flow of the pipeline is further arranged in the ammonia water conveying pipeline.

In order to ensure the mixing effect of the ammonia water and the desalted water in the ammonia adding mixing tank, the device also comprises a stirring device for stirring and mixing the liquid in the ammonia adding mixing tank.

In order to avoid the problem of overpressure in the conveying process of the desalted water output pipeline, a return pipeline is further arranged between the desalted water output pipeline and the ammonia adding mixing tank, and a safety valve is arranged on the return pipeline.

As an improvement, the bottom of the ammonia adding mixing tank is also provided with an emptying pipeline.

As an improvement, the ammonia water conveying pipeline is also provided with a shower guide pipe.

In order to smoothly convey the ammonia water in the ammonia water preparation system of the water-coal-slurry boiler device to the ammonia adding mixing tank, a conveying pipeline is simplified, and the transformation cost is reduced.

Compared with the prior art, the utility model has the advantages that: the demineralized water ammonia adding system provided by the utility model is characterized in that the preparation ammonia water system is also arranged in the water-coal-slurry boiler device, the preparation use concentration is close, ammonia water in the preparation ammonia water system of the water-coal-slurry boiler device is introduced into an ammonia adding mixing tank of the demineralized water ammonia adding system, and after the modification and the application, two operation links of replacing a steel cylinder in an ammonia adding room of a chemical water treatment station and preparing the ammonia water, wherein the two operation links have the risk of ammonia leakage, do not have fixed dangerous points for storing and using the liquid ammonia steel cylinder, and meanwhile, the purchase cost and the system maintenance cost of the liquid ammonia steel cylinder are saved. On the other hand, the ammonia adding operation of the desalted water is more convenient, and the flow is controlled only by controlling the valve, so that the ammonia unit price is relatively cheap in the operation mode, and the safety and the economy are improved.

Drawings

FIG. 1 is a flow chart of a demineralized water ammonia addition system according to an embodiment of the present utility model.

Detailed Description

The utility model is described in further detail below with reference to the embodiments of the drawings.

In the description and claims of the present utility model, terms indicating directions, such as "front", "rear", "upper", "lower", "left", "right", "side", "top", "bottom", etc., are used to describe various example structural parts and elements of the present utility model, but these terms are used herein for convenience of description only and are determined based on the example orientations shown in the drawings. Because the disclosed embodiments of the utility model may be arranged in a variety of orientations, the directional terminology is used for purposes of illustration and is in no way limiting, such as "upper" and "lower" are not necessarily limited to being in a direction opposite or coincident with the direction of gravity.

Referring to fig. 1, a demineralized water ammonia addition system includes an ammonia addition mixing tank 10, the ammonia addition mixing tank 10 having a first liquid inlet 11 and a second liquid inlet 12 at a top portion and a first liquid outlet 13 at a bottom portion. Wherein, the first liquid inlet 11 supplies demineralized water to input thereinto, and the second liquid inlet 12 supplies ammonia water to enter thereinto. The desalted water and the aqueous ammonia are fed into the ammonia adding mixing tank 10 to be mixed, and the desalted water mixed with the aqueous ammonia is discharged through the first liquid outlet 13.

The first liquid inlet 11 of the ammoniated mixing tank 10 is connected to a desalted water inlet line 21. The second liquid inlet 12 of the ammonia addition mixing tank 10 is connected with an ammonia water conveying pipeline 22. Specifically, the inlet of the ammonia water conveying pipeline 22 of the embodiment is communicated with the ammonia water preparing system of the water-coal-slurry boiler device and is used for introducing the prepared ammonia water in the ammonia water preparing system of the water-coal-slurry boiler device into the ammonia adding mixing tank 10. The aqueous ammonia preparation system of the coal water slurry boiler plant generally includes a main aqueous ammonia line 31 for delivering aqueous ammonia to the flue gas desulfurization system or the denitration system of the coal water slurry boiler, as shown in fig. 1, two main aqueous ammonia lines 31 leading to the # 1 boiler and the # 2 boiler, respectively. The ammonia water pump 32 is arranged on the two main ammonia water pipelines 31, and the ammonia water conveying pipeline 22 is communicated with the main ammonia water pipelines 31 through a tee joint. In the reconstruction process, on the basis of the ammonia water preparation system of the original water-coal-slurry boiler device, only the corresponding ammonia water conveying pipeline 22 is introduced, so that the conveying pipeline is simplified, the reconstruction cost is reduced, and the ammonia water in the ammonia water preparation system of the water-coal-slurry boiler device can be smoothly conveyed into the ammonia adding mixing tank 10.

The ammonia water conveying pipeline 22 of the embodiment is also provided with a spray guiding pipe 26, the spray guiding pipe 26 is provided with a spray guiding valve, and after ammonia addition is completed each time, the ammonia water in the pipeline can be emptied. The bottom of the ammoniated mixing tank 10 of this embodiment is provided with an evacuation line 25 for evacuating the liquid in the ammoniated mixing tank 10 during servicing.

In order to control the flow rate of the aqueous ammonia entering the ammonia addition mixing tank 10, a control valve 221 for controlling the flow rate of the aqueous ammonia is further provided in the aqueous ammonia transport line 22. In order to ensure the mixing effect of the aqueous ammonia and the desalted water in the ammonia adding and mixing tank 10, a stirring device 14 for stirring and mixing the liquid in the ammonia adding and mixing tank 10 is further included. As shown in fig. 1, the stirring device 14 comprises a stirring paddle rotatably connected to the ammoniated mixing tank 10, and the stirring paddle can be driven to rotate by a driving device (such as a motor).

The desalted water output pipeline 23 is also provided with a liquid supply pump 231 for delivering the desalted water mixed with ammonia water to a downstream dosing point, and the liquid supply pump 231 can be a diaphragm pump. A return pipeline 24 is further arranged between the desalted water output pipeline 23 and the ammonia adding mixing tank 10, and a safety valve is arranged on the return pipeline 24, so that when the desalted water output pipeline exceeds a set pressure in the process of conveying the desalted water, the safety valve can be automatically opened to return the desalted water to the ammonia adding mixing tank 10.

The demineralized water ammonia adding system of the present embodiment takes into consideration that the water coal slurry boiler apparatus also has a preparation ammonia water system, and the preparation use concentration is close, so that the ammonia water in the preparation ammonia water system of the water coal slurry boiler apparatus is introduced into the ammonia adding mixing tank 10 of the demineralized water ammonia adding system. After the desalted water ammonia adding system is transformed and put into use, two operation links of replacing the steel cylinder in the ammonia adding room of the chemical water treatment station and preparing ammonia water, which have the risk of ammonia leakage, are removed, and the fixed dangerous point for storing and using the liquid ammonia steel cylinder is not existed, so that the purchase and system maintenance cost of the liquid ammonia steel cylinder are saved. On the other hand, the ammonia adding operation of the desalted water is more convenient, and the flow rate is only controlled by the control valve 221, so that the ammonia unit price is relatively cheap in the operation mode, and the safety and the economy are improved.

Claims

1. A demineralized water ammonia-adding system, comprising:

an ammonia adding mixing tank (10) for mixing desalted water with ammonia water, and having a first liquid inlet (11), a second liquid inlet (12) and a first liquid outlet (13);

the desalted water input pipeline (21) is connected with the first liquid inlet (11);

the desalted water output pipeline (23) is connected with the first liquid outlet (13);

characterized by further comprising:

the inlet of the ammonia water conveying pipeline (22) is communicated with an ammonia water preparation system of the water-coal-slurry boiler device, the outlet of the ammonia water conveying pipeline is communicated with a second liquid inlet (12) of the ammonia adding mixing tank (10), and a control valve (221) for controlling the flow of the pipeline is further arranged in the ammonia water conveying pipeline (22).

2. The demineralized water ammonia system of claim 1, wherein: further comprises a stirring device (14) for stirring and mixing the liquid in the ammonia adding and mixing tank (10).

3. The demineralized water ammonia system of claim 1, wherein: a return pipeline (24) is further arranged between the desalted water output pipeline (23) and the ammonia adding mixing tank (10), and a safety valve is arranged on the return pipeline (24).

4. The demineralized water ammonia system of claim 1, wherein: the bottom of the ammonia adding mixing tank (10) is also provided with an emptying pipeline (25).

5. The demineralized water ammonia system of claim 1, wherein: the ammonia water conveying pipeline (22) is also provided with a shower guide pipe (26).

6. The demineralized water ammonia system of any one of claims 1-5, wherein: the ammonia water preparation system of the coal water slurry boiler device comprises a main ammonia water pipeline (31) for conveying ammonia water to a flue gas desulfurization system or a denitration system of the coal water slurry boiler, an ammonia water pump (32) is arranged in the main ammonia water pipeline (31), and the ammonia water conveying pipeline (22) is communicated with the main ammonia water pipeline (31).