Technical Discussion-----Issue 12 (Rewards for active participation)

The internal equipment of the boiler drum includes steam-water separation and steam cleaning devices, feedwater distribution pipes, sludge discharge and chemical dosing equipment, etc. The function of the steam-water separation device is to separate the saturated steam coming from the water wall from the water, and to minimize the amount of fine water droplets carried in the steam. In medium and low-pressure boilers, baffle plates and slotted baffle plates are commonly used as coarse separation elements ； In boilers above medium pressure, in addition to the widespread use of various types of cyclone separators for preliminary separation, louver screens, wire meshes, or vapor equalizing plates are also employed for further separation. The boiler drum is also equipped with monitoring and protection devices such as a water level gauge and a safety valve.

Soda separation devices include inlet baffles, cyclone separators, corrugated plate separators, porous plate separators, and others.

The internal equipment of the boiler drum includes steam-water separation and steam cleaning devices, feedwater distribution pipes, sludge discharge and chemical dosing equipment, etc. The function of the steam separation device is to separate the saturated steam coming from the water wall from the moisture, and to minimize the amount of fine water droplets contained in the steam. In medium and low-pressure boilers, baffle plates and slotted baffle plates are commonly used as coarse separation elements ； In boilers above medium pressure, in addition to the widespread use of various types of cyclone separators for preliminary separation, louver screens, wire meshes, or vapor equalizing plates are also employed for further separation.

Soda separation devices include inlet baffles, cyclone separators, corrugated plate separators, porous plate separators, and others

The steam-water separation devices installed in the drum include: steam outlet baffles, corrugated plate separators, porous plates, and several other types.

The steam-water separation devices installed in the drum include: steam outlet baffles, vertical louver baffles, corrugated plate separators, and perforated plates.

The steam-water cyclone separator inside the drum is composed of components such as the cylinder body, inlet pipe, top cap, overflow ring, bottom guide vanes, and bottom plate. A cyclone separator is a vapor-water separation device with excellent separation performance. Its working principle and process are as follows: A mixture of steam and water at a high flow rate enters the cylinder tangentially through the inlet pipe, thereby generating rotational motion; under the effect of centrifugal force, the water droplets are thrown against the cylinder wall, allowing for a preliminary separation of steam from water. The separated water flows into the drum water volume through the guide vanes around the bottom of the drum. Saturated steam flows upward inside the cylinder, entering the gaps between the corrugated plates of the top cap and flowing in a tortuous path. Under the action of centrifugal force and inertial force, small water droplets are thrown onto the corrugated plates; due to adhesion forces, a water film is formed that flows downward and enters the water volume in the drum, thereby facilitating further separation of steam from water. Meanwhile, saturated steam is introduced into the steam space of the drum from above or around the top cap. Depending on the parameter capacity, the internal components of power station boilers vary. Taking the drums of high-pressure and ultra-high-pressure boilers as examples, this article introduces their internal components, their arrangement, and their main functions. Several cyclone separators are installed on both sides along the length of the drum. At the top of each cyclone separator’s cylinder, there is a louvered (wavy-plate) separator; their main function is to carry out a preliminary separation of steam and water in the steam-water mixture introduced from the rising pipe. In the middle and upper part of the drum, steam cleaning orifice plates are installed horizontally, with a layer of cleaning water above them. When steam passes through this water layer, some of the salts dissolved in the steam or carried by it are transferred into the water, thereby reducing the salt content in the steam. A perforated plate is located near the top of the drum; it distributes the steam rising within the drum evenly and further separates the moisture from the steam. An emergency drain outlet is located at approximately 150 mm below the centerline of the drum ； A continuous blowdown pipe outlet is located about 200 mm below the normal water level, with a chemical dosing pipe arranged further below. A cross baffle is also installed at the inlet of the downcomer to prevent vortices from forming at the downcomer outlet, which could cause vapor to enter the downcomer. The louver separator in the drum is composed of many parallel wavy thin steel plates; the thickness of these wavy plates is 0.8–1.2 mm, the distance between adjacent plates is 10 mm, and they are secured by steel frames that are 2–3 mm thick. The working principle and process are ； After rough separation, the steam enters the louver separator and flows tortuously between the corrugated plates. The small water droplets in the steam are thrown against the plate wall under the action of centrifugal force, inertial force, and gravity; due to adhesion forces, these droplets stick to the corrugated plate, forming a water film. Under the effect of gravity, the water film flows downward into the drum water volume, allowing for further separation of steam and water. Due to its excellent effectiveness in separating fine water droplets from steam using adhesion, louver plates are widely used as fine separation devices.

The steam-water separation devices installed in the drum include: steam outlet baffles, vertical louver baffles, corrugated plate separators, and perforated plates.

CYCLONE, BAFFLE PLATE

Soda separation devices include inlet baffles, cyclone separators, corrugated plate separators, porous plate separators, and others.

Imported baffle plates, cyclone separators, corrugated plate separators, perforated plates, vertical louver baffle plates, etc

The steam-water separation devices installed in the drum include: steam outlet baffles, cyclone separators, vertical louver baffles, corrugated plate separators, perforated plate separators, and more.

Soda separation devices include inlet baffles, cyclone separators, corrugated plate separators, porous plate separators, etc.

Soda separation devices are divided into two categories: primary separation and secondary refinement, each of which comes in various structural forms based on differences in structure or separation mechanism. :D

To obtain pure steam, high-parameter boilers are equipped with sophisticated steam-water separation devices and steam cleaning systems in their drum. The main function of the steam separation device is to reduce the amount of water carried by saturated steam, thereby lowering the moisture content of the steam – in other words, reducing the mechanical loading capacity of saturated steam. A properly designed steam separation device can reduce the moisture content in the steam exiting the drum to 0.01%-0.03%, with a maximum of no more than 0.05%. A steam cleaning device is an effective tool for ensuring steam purity, as it functions to reduce the amount of substances dissolved in the steam. Based on their principle, soda separators can be divided into natural separation and mechanical separation. Commonly used types include submersed orifice plates, baffles, equalizing orifice plates, vapor collection tubes, volute-type separators, corrugated plate and wire mesh separators, as well as cyclone separators

Most of the steam-water separation devices in boilers are cyclone separators and membrane removal screens

Soda shield, cyclone separator, corrugated plate separator, underwater perforated plate, etc

Imported baffles, cyclone separators, corrugated plate separators, perforated plate separators, etc