A deep energy-saving desuperheating water system for a power plant boiler superheater

Abstract

The application discloses a kind of deep energy-saving power plant boiler superheater desuperheating water systems, belongs to superheater desuperheating water field, including energy-saving superheater desuperheating water system, energy-saving superheater desuperheating water system includes pressure-reducing module, desuperheating pipe network, desuperheating module and liquefied water collection detection module, pressure-reducing module is made of air pressure detector and pressure-reducing valve, desuperheating module is made of temperature detector, preheating desuperheater and atomizer, desuperheating pipe network is first with pressure-reducing module communication, later with desuperheating module communication, and desuperheating pipe network bottom is connected with liquefied water collection detection module communication.The application is sequentially preheated to desuperheating water in desuperheating water pipe by setting three-stage preheating pipe network, and sequentially cools to superheated steam, avoids directly atomizing injection desuperheating water into desuperheating pipe network, leading to liquefied water increase, simultaneously by setting preheating pipe network on the outside of pressure-reducing pipe network, can reduce internal steam heat, so that a part of steam liquefies, reduces pipe internal air pressure, accelerates pressure-reducing speed.

Description

Technical Field

[0001] This invention relates to the field of superheater desuperheating water technology, and more particularly to a deep energy-saving superheater desuperheating water system for power plant boilers. Background Technology

[0002] The desuperheating water in power plant boilers is divided into superheater desuperheating water and reheater emergency desuperheating water. Currently, the main method is to first reduce the pressure and then reduce the temperature using a desuperheating and pressure reducing device. The pressure reduction is achieved by throttling a portion of the feedwater tap water into the hot steam pipeline. The desuperheating is achieved by delivering the desuperheating water through the desuperheating pipeline to the superheater desuperheating pipeline after pressure reduction via atomizing nozzles.

[0003] However, the existing superheater desuperheating water in power plant boilers is directly atomized and sprayed into the superheated steam without preheating. This desuperheating method will result in a large amount of liquefied water being generated when the desuperheating water encounters the superheated steam, reducing the steam content in the desuperheating pipe. It needs to be vaporized during transportation, which increases the energy consumption of the power plant boiler.

[0004] Therefore, we propose a highly energy-efficient superheater desuperheating water system for power plant boilers. Summary of the Invention

[0005] The purpose of this invention is to solve the problem in the prior art that directly atomizes and sprays desuperheating water into the desuperheating pipe, resulting in a large amount of liquefied water in the steam in the superheater desuperheating pipe, which needs to be re-vaporized, increasing the energy consumption of the power plant boiler. The invention proposes a deeply energy-saving power plant boiler superheater desuperheating water system.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A deep energy-saving superheater desuperheating water system for power plant boilers includes an energy-saving superheater desuperheating water system. The energy-saving superheater desuperheating water system includes a pressure reducing module, a desuperheating pipe network, a desuperheating module, and a liquefied water collection and detection module. The pressure reducing module consists of a pressure detector and a pressure reducing valve. The desuperheating module consists of a temperature detector, a preheating desuperheater, and an atomizer. The desuperheating pipe network is first connected to the pressure reducing module and then to the desuperheating module, and the bottom of the desuperheating pipe network is connected to the liquefied water collection and detection module.

[0008] Preferably, the de-heating pipe network consists of a pressure-reducing pipe network and a cooling pipe network. The pressure-reducing pipe network is first connected to the pressure-reducing module and then connected to the cooling pipe network, and the cooling pipe network is connected to the de-heating module.

[0009] Preferably, the pressure reducing valve reduces the steam pressure delivered by the desuperheating pipeline, the desuperheating module cools the superheated steam after pressure reduction, and the liquefied water content inside the desuperheating pipeline is detected by the liquefied water collection and detection module.

[0010] Preferably, the pressure detector and temperature detector are both located inside the pressure reducing network and the cooling network, the preheating desuperheater consists of a preheating network and an electronic valve, and the atomizer is located at the connection between the cooling network and the pressure reducing network and inside the preheating network.

[0011] Preferably, the preheating pipe network is located outside the pressure reducing pipe network, and the bottom of the preheating pipe network is connected to a desuperheating water pipe. The desuperheating water is atomized into water mist by an atomizer, so that the atomized water droplets adhere to the outer surface of the pressure reducing pipe network for preheating, and the preheated atomized water droplets are injected into the cooling pipe network.

[0012] Preferably, the preheating network consists of a primary preheating pipe, a secondary preheating pipe, and a tertiary preheating pipe, and the preheating temperature inside the primary, secondary, and tertiary preheating pipes decreases sequentially.

[0013] Preferably, the primary preheating pipe, the secondary preheating pipe, and the tertiary preheating pipe are connected to the cooling pipe network in sequence to preheat and desuperheat the steam after pressure reduction and cool it down.

[0014] Preferably, the liquefied water collection and detection module consists of a collection pipe, a shut-off valve, and a pressure detector. The shut-off valve is located on top of the pressure detector, and the collected liquefied water is collected through the pressure detector.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. To address the problem in existing technologies where desuperheating water is directly atomized and sprayed into the desuperheating pipes, resulting in a large amount of liquefied water in the steam within the superheater desuperheating pipes, which requires re-vaporization and increases the energy consumption of the power plant boiler, a three-stage preheating network is installed. This network can preheat the desuperheating water transported in the desuperheating water pipes step by step and cool the superheated steam after pressure reduction step by step, avoiding the direct injection of desuperheating water atomized into the desuperheating network, which would lead to an increase in liquefied water.

[0017] 2. By setting the preheating pipeline outside the pressure reducing pipeline, the heat of the internal steam can be reduced, causing some of the steam to liquefy and reducing the gas pressure inside the pipe. Then, the liquefaction collection and detection module detects the liquefied water content, thereby controlling the number of stages of the preheating pipeline and setting the final temperature of the preheating and desuperheating water based on the liquefied water content, so that the liquefied water content is reduced to below the lower limit of the water content. Attached Figure Description

[0018] Figure 1 This is a block diagram of a deep energy-saving power plant boiler superheater desuperheating water system proposed in this invention.

[0019] Figure 2 This is a block diagram of the pressure reducing module of a deep energy-saving power plant boiler superheater desuperheating water system proposed in this invention;

[0020] Figure 3 This is a block diagram of the desuperheating pipe network of a deep energy-saving power plant boiler superheater desuperheating water system proposed in this invention.

[0021] Figure 4 This is a block diagram of the desuperheating module of a deep energy-saving power plant boiler superheater desuperheating water system proposed in this invention.

[0022] Figure 5 This is a block diagram of a liquefied water collection and detection module for a deep energy-saving power plant boiler superheater desuperheating water system proposed in this invention. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0024] Reference Figure 1-5 A deep energy-saving power plant boiler superheater desuperheating water system includes an energy-saving superheater desuperheating water system. The energy-saving superheater desuperheating water system includes a pressure reducing module, a desuperheating pipe network, a desuperheating module, and a liquefied water collection and detection module. The pressure reducing module consists of a pressure detector and a pressure reducing valve. The desuperheating module consists of a temperature detector, a preheating desuperheater, and an atomizer. The desuperheating pipe network is first connected to the pressure reducing module and then to the desuperheating module, and the bottom of the desuperheating pipe network is connected to the liquefied water collection and detection module.

[0025] Specifically, the de-heating pipeline network consists of a pressure-reducing pipeline network and a cooling pipeline network. The pressure-reducing pipeline network is first connected to the pressure-reducing module and then connected to the cooling pipeline network, and the cooling pipeline network is connected to the de-heating module.

[0026] Specifically, the pressure detector and temperature detector are both installed inside the pressure reducing pipeline and the cooling pipeline, the preheating desuperheater consists of a preheating pipeline and an electronic valve, and the atomizer is installed at the connection between the cooling pipeline and the pressure reducing pipeline and inside the preheating pipeline.

[0027] By using the above technical solution, the heat of the internal steam can be reduced by setting the preheating pipeline outside the pressure reducing pipeline, thereby liquefying some of the steam and reducing the gas pressure inside the pipeline.

[0028] Specifically, the preheating pipe network is located outside the pressure reducing pipe network, and the bottom of the preheating pipe network is connected to a desuperheating water pipe. The desuperheating water is atomized into water mist by an atomizer, so that the atomized water droplets adhere to the outer surface of the pressure reducing pipe network for preheating, and the preheated atomized water droplets are injected into the cooling pipe network.

[0029] With the above technical solution, the desuperheating water pipe is set at the bottom of the preheating pipe network, which can collect the liquefied water inside the preheating pipe network and avoid excessive preheating liquefied water, which would increase the liquefied water content inside the desuperheating pipe network.

[0030] Specifically, the preheating pipe network consists of a primary preheating pipe, a secondary preheating pipe, and a tertiary preheating pipe, with the internal preheating temperatures of the primary, secondary, and tertiary preheating pipes decreasing sequentially. The primary, secondary, and tertiary preheating pipes are connected to the cooling pipe network in sequence to preheat and desuperheat the depressurized steam and cool the desuperheated water step by step.

[0031] The above technical solution preheats the desuperheating water transported in the desuperheating water pipe in stages and cools the superheated steam after pressure reduction in stages, avoiding the direct injection of desuperheating water into the desuperheating pipe network, which would lead to an increase in liquefied water.

[0032] Specifically, the pressure reducing valve reduces the steam pressure delivered by the desuperheating pipeline, the desuperheating module cools the superheated steam after pressure reduction, and the liquefied water content inside the desuperheating pipeline is detected by the liquefied water collection and detection module. The liquefied water collection and detection module consists of a collection pipe, a shut-off valve, and a pressure detector. The shut-off valve is located on top of the pressure detector, and the collected liquefied water is collected by the pressure detector.

[0033] Using the above technical solution, when detecting liquefied water in the cooling pipe network, the shut-off valve can be opened to wait for the liquefied water to accumulate, and then closed after a set time. The weight of the liquefied water is detected by a pressure detector installed at the bottom of the collection pipe, thereby determining the liquefied water content inside the cooling pipe network. The liquefied water content is then detected by the liquefied water collection and detection module, and the liquefied water content is used to control the number of preheating pipes and set the final temperature of the preheating and cooling water, so that the liquefied water content is reduced to below the lower limit of the liquefied water content.

[0034] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A deep energy-saving superheater desuperheating water system for power plant boilers, comprising an energy-saving superheater desuperheating water system, characterized in that, The energy-saving superheater desuperheating water system includes a pressure reducing module, a desuperheating pipe network, a desuperheating module, and a liquefied water collection and detection module. The pressure reducing module consists of a pressure detector and a pressure reducing valve. The desuperheating module consists of a temperature detector, a preheating desuperheater, and an atomizer. The desuperheating pipe network is first connected to the pressure reducing module and then to the desuperheating module, with its bottom connected to the liquefied water collection and detection module. The desuperheating pipe network consists of a pressure reducing pipe network and a cooling pipe network. The pressure reducing pipe network is first connected to the pressure reducing module and then to the cooling pipe network, with the cooling pipe network also connected to the desuperheating module. The pressure detector and temperature detector are both located inside the pressure reducing and cooling pipe networks. The preheating desuperheater consists of a preheating pipe network and an electronic valve. The atomizer is located at the connection point between the cooling and pressure reducing pipe networks and the preheating pipe network. Inside the heat pipe network; the preheating pipe network is located outside the pressure reducing pipe network, and the bottom of the preheating pipe network is connected to a desuperheating water pipe. The desuperheating water is atomized into water mist by an atomizer, so that the atomized water droplets adhere to the outer surface of the pressure reducing pipe network for preheating, and the preheated atomized water droplets are injected into the cooling pipe network; the preheating pipe network consists of a primary preheating pipe, a secondary preheating pipe, and a tertiary preheating pipe, and the preheating temperature inside the primary, secondary, and tertiary preheating pipes decreases sequentially; the primary, secondary, and tertiary preheating pipes are connected to the cooling pipe network in sequence to preheat the desuperheating water step by step after the pressure is reduced to cool it down; the liquefied water collection and detection module consists of a collection pipe, a shut-off valve, and a pressure detector. The shut-off valve is located on top of the pressure detector, and the pressure detector collects the liquefied water.

2. The deep energy-saving power plant boiler superheater desuperheating water system according to claim 1, characterized in that, The pressure reducing valve reduces the steam pressure delivered by the desuperheating pipeline, the desuperheating module cools the superheated steam after pressure reduction, and the liquefied water content inside the desuperheating pipeline is detected by the liquefied water collection and detection module.

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