CN203329617U - Desulfurization slurry feed system - Google Patents

Abstract

This utility model discloses a desulfurization slurry supply system, comprising: two slurry distributors, a limestone slurry storage tank, and three overflow tanks. The two slurry distributors are connected to the limestone slurry storage tank via two outlet pipes for distributing slurry to the storage tank. Valves are installed on the two outlet pipes. Each of the two slurry distributors has a branch pipe, which merges into a main pipe connected to the three overflow tanks. Valves are installed on the two branch pipes. The three overflow tanks are each connected to a desulfurization tower. This utility model's desulfurization slurry supply system has good stability and can save costs.

Description

A desulfurization slurry supply system

technical field

The utility model relates to a supply system in the industrial field, in particular to a desulfurization slurry supply system.

Background technique

As environmental protection issues are getting more and more attention, the importance of systems such as desulfurization and denitrification to control the pollution emission indicators of thermal power plants has also increased. The outage of the desulfurization system will bring huge losses to the power plant, so the research on improving its stability is very necessary. In the limestone wet desulfurization process, the slurry supply system is an important part of the whole desulfurization system. The system continuously supplies limestone slurry to the FGD absorption tower. The slurry supply system makes limestone slurry from limestone and continuously provides qualified and uniform slurry to the absorption tower. It is an important part of the desulfurization system. Once the slurry supply system stops supplying limestone slurry, the entire desulfurization system will be forced to shut down; the slurry supply system cannot provide qualified and uniform limestone slurry, which will also seriously affect the desulfurization efficiency of the system. Therefore, the stability of the slurry supply system restricts the desulfurization efficiency of flue gas, and also maintains the safe operation of the entire desulfurization system. It can be seen that the research on improving the stability of the desulfurization slurry supply system has strong practical significance.

Limestone is ground in a wet ball mill by adding an appropriate proportion of water to make limestone slurry, and then passes through the slurry circulation box, slurry cyclone, slurry distributor and other equipment step by step, then enters the limestone slurry storage tank, and then passes through the slurry feeding pump Supply FGD absorption tower to participate in flue gas desulfurization reaction. The desulfurization slurry supply system of Gaojing Thermal Power Plant, as a public desulfurization system, adopts the current common layout, as shown in Figure 1.

But, prior art scheme has following shortcoming:

1. The uniqueness of the slurry storage tank poses a serious threat to the continuous and stable slurry supply of the system;

2. The long-term operation of the agitator in the slurry storage tank poses a potential hidden danger to the continuous and stable slurry supply of the system;

3. The arrangement of the slurry feed pump is unfavorable to the continuous and stable slurry supply of the system;

In the prior art, there are several design schemes as follows, but they are not very ideal:

1. Increase the spare slurry storage tank

Next to the original limestone slurry storage tank, build a new spare slurry storage tank and slurry feeding pump, that is, add a new channel for the supply of limestone slurry, which completely solves the above problems and can better improve the stability of the slurry supply system. sex. However, although this solution is theoretically feasible, the construction of a new standby slurry storage tank requires a large amount of capital investment and a suitable construction site. The project is relatively large and the feasibility is relatively poor.

2. Prepare spare parts for slurry storage tank agitator

Prepare a new set of agitators, which have the same configuration parameters as the original limestone slurry tank agitators, for replacement in time when the agitator fails or needs to be overhauled. This scheme can improve the stability of the limestone storage tank, and is simple and easy to implement. But it can only solve one of the aforementioned problems, and when the agitator of the limestone slurry storage tank is removed and replaced with a new one, the loss of agitation of the limestone slurry in the tank will cause sedimentation and accumulation, and also cause the suspension of slurry supply. It can be judged that the effect of improving the stability of the slurry supply system after the implementation of this scheme is not significant.

3. Add a new slurry feeding pump

Install a new backup feed pump at the limestone slurry storage tank. Although this solution can quickly switch to the backup pump when the working slurry feed pump fails, it also cannot solve the slurry supply interruption when the slurry storage tank leaks or the agitator fails. question. Therefore, this scheme can not achieve the expected effect of optimization transformation.

Therefore, how to solve the above problems is the research direction of those skilled in the art.

Contents of the invention

The main purpose of this utility model is to provide a desulfurization slurry supply system to solve the stability problem in the above-mentioned prior art.

In order to achieve the above purpose, the utility model provides a desulfurization slurry supply system, which includes: two slurry distributors, limestone slurry storage tanks and three overflow tanks, the two slurry distributors are connected through two outlet pipes and The limestone slurry storage tanks are connected to each other for distributing slurry to the limestone slurry storage tanks, the two outlet pipelines are provided with valves, and the two slurry distributors respectively have a branch pipeline, the two The branch pipes are merged into a main pipe and connected to the three overflow tanks, the two branch pipes are respectively provided with valves, and the three overflow tanks are connected to the desulfurization towers respectively. Wherein, valves are respectively connected to the entrances of the three overflow boxes.

Wherein, the three overflow tanks are respectively connected with the desulfurization tower through overflow pumps.

Wherein, the limestone slurry storage tank is connected with the desulfurization tower through a slurry feeding pump.

Compared with the prior art, the utility model has the following beneficial effects:

1. The desulfurization slurry supply system opens up a spare slurry supply path, which greatly improves the stability of the slurry supply system.

2. The slurry supply mode of limestone slurry entering the absorption tower through the newly installed pipeline through the overflow box in the form of self-flow has little impact on the entire desulfurization system, and can ensure the desulfurization efficiency and system reliability can be better guaranteed.

3. The scheme of introducing the slurry into the overflow tank has a small construction scale and a small investment, thus saving costs.

Description of drawings

Figure 1 is a layout diagram of the desulfurization slurry supply system of Gaojing Thermal Power Plant;

Figure 2 is a structural schematic diagram of the desulfurization slurry supply system after optimization and modification.

Detailed ways

The above-mentioned and other technical features and advantages of the present utility model will be described in more detail below in conjunction with the accompanying drawings.

As shown in Fig. 2, it is a structural schematic diagram of the utility model after optimization and transformation of the desulfurization slurry supply system. The utility model comprises: two slurry distributors, a limestone slurry storage box and three overflow boxes, the two slurry distributors are respectively connected with the limestone slurry storage box through outlet pipes, and are used to supply the The limestone slurry storage tank distributes the slurry, the outlet pipelines are provided with valves, the two slurry distributors respectively have a branch pipeline, and the two branch pipelines merge into a main pipeline connected to the three overflow tanks, The two branch pipelines are respectively provided with valves, and the three overflow tanks are respectively connected to desulfurization towers.

The utility model is to respectively connect a branch pipe with the same diameter and material as the original pipe from the outlet pipes of two limestone slurry distributors A and B, and connect them to No. 1, No. 2, No. No. 3 overflow box inlet, in order to prevent slurry from accumulating and reducing the flow area, therefore, minimize the use of elbows and install corresponding valves:

① Valves a and b are installed between the limestone slurry distributor and the entrance door of the overflow tank;

② Valves c and d are installed at the entrance door of the limestone slurry storage tank;

③ There are valves installed at the entrance door of No. 1 overflow tank, No. 2 overflow tank and No. 3 overflow tank.

After installing new pipes and valves, if the limestone slurry storage tank (including agitator), feed pump and valves fail, first open the valves a and b from the slurry distributor to the overflow tank inlet, and then close the limestone slurry storage tank. The tank inlet valves c and d allow the slurry to flow through the overflow tank and enter the FGD absorption tower to ensure the normal operation of the desulfurization system. After closing the inlet door of the limestone slurry storage tank and the outlet door of the feed pump, the limestone slurry storage tank can be disconnected from the FGD system, the slurry can be discharged and washed, and other maintenance work can be performed.

Wherein, the three overflow tanks are respectively connected with the desulfurization tower through overflow pumps. The limestone slurry storage tank is connected with the desulfurization tower through a slurry feed pump.

In summary, compared with the prior art, the utility model has the following beneficial effects:

1. The desulfurization slurry supply system opens up a spare slurry supply path, which greatly improves the stability of the slurry supply system.

2. The slurry supply mode of limestone slurry entering the absorption tower through the newly installed pipeline through the overflow box in the form of self-flow has little impact on the entire desulfurization system, and can ensure the desulfurization efficiency and system reliability can be better guaranteed.

3. The scheme of introducing the slurry into the overflow tank has a small construction scale and a small investment, thus saving costs.

The above description is only illustrative of the present utility model, rather than restrictive. Those of ordinary skill in the art understand that many modifications and changes can be made without departing from the spirit and scope defined by the following appended claims. , or equivalent, but all will fall within the protection scope of the present utility model.

Claims (4)

1. a desulfurization slurry feed system, it is characterized in that, it comprises: two serous fluid distributors, lime stone slurry container and three spill boxes, described two serous fluid distributors are connected with described lime stone slurry container by two outlet conduits, for to described lime stone slurry container, distributing slurries, be provided with valve on described two outlet conduits, described two serous fluid distributors have respectively a lateral, these two laterals converge into a female pipeline and are connected with described three spill boxes, be respectively arranged with valve on described two laterals, described three spill boxes are connected with respectively desulfurizing tower.

2. a kind of desulfurization slurry feed system according to claim 1, is characterized in that, in the porch of described three spill boxes, is connected with respectively valve.

3. a kind of desulfurization slurry feed system according to claim 1, is characterized in that, described three spill boxes are connected with desulfurizing tower by flood pump respectively.

4. a kind of desulfurization slurry feed system according to claim 1, is characterized in that, described lime stone slurry container is connected with desulfurizing tower by the slurries feed pump.

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