RU133256U1 - VERTICAL DRUM STEAM RECOVERY BOILER WITH SECTED WATER HEATING SURFACES - Google Patents

Abstract

1. A steam drum recovery boiler containing a vertical flue with a non-equilateral rectangular cross-section, horizontal packages of evaporating, superheater and water heating surfaces and separation drums located outside the flue along its longer walls, placed inside the specified flue, characterized in that at least one of the packages of the heating surfaces is divided into at least two sections connected in parallel along the water, each of which is independently equipped water and gas disconnecting authorities. 2. A steam recovery boiler according to claim 1, characterized in that each water-heating section is composed of horizontally located Field pipes with paired inlet and outlet prefabricated chambers that are removed from the duct. A steam recovery boiler according to claim 1 or 2, characterized in that the organ shutting off the gas heating section for gas is made in the form of a horizontal roller shutter installed above the section with a controlled electric drive outside the duct.

Description

Area of use

The utility model relates to a power system and can be used in steam recovery boilers (KU) of combined cycle gas turbine power plants (PTU-CHP).

State of the art

Nowadays, technical training colleges are becoming more and more widespread, in which steam drum CCs with natural or forced circulation are installed in order to utilize the heat of gases after a gas turbine. The steam obtained in the KU is used in steam turbine plants (PTU) for generating electricity, as well as for heating purposes (PTU-CHP).

There are two layout types of energy KU - horizontal and vertical. In the horizontal KU, the pipes of the evaporative heating surfaces (SPI) are arranged vertically, which, due to their relatively low hydraulic resistance, forces of gravity allows for the natural circulation of the steam-water mixture (PVA) with the required optimal multiplicity of circulation (3.0 ... 3.5) or during forced circulation significantly reduce the power consumption of circulation pumps. In the vertical KU, the pipes of the IPN coil packages are arranged horizontally, which, due to increased hydraulic resistance to gravity forces, requires the use of forced circulation or during natural circulation, a significant increase in the installation height of separation drums to increase the circulation pressure. However, to accommodate a more economical KU of horizontal type, a relatively larger area is required, which creates certain difficulties for the layout of the power plant equipment. Therefore, for industrial implementation, a vertical drum KU is preferable provided that the inherent disadvantages of this type of boilers are eliminated.

Known is the steam drum KU adopted as a prototype of the claimed utility model, comprising a vertical duct with a non-equilateral rectangular cross-section, horizontal packages of evaporative, superheater and water heating surfaces and separation drums located outside the duct along its longer walls (RU 52464, F22B 1/18, 2006 [1]). The location according to [1] of the separation drums of the vertical KU along its longer walls, in contrast to the usually practiced their location along the shorter walls of the gas duct, allows to increase the number of IPN packets parallel to the indicated drums of pipes, which significantly reduces the hydraulic resistance of the IPN of the vertical KU drum type.

At the same time, the development of all-mode CCGT - CHP plants with a wide range of regulation of energy supply to thermal consumers has recently been underway. At the same time, KU water-heating surfaces (VPN), mainly gas condensate heaters (GPC) and, in some cases, water economizers (VE) should allow a wide variation in their thermal load.

Utility Model Disclosure

The objective of the utility model and the technical result achieved by it is to maintain the effective operation of the VPN vertical drum steam KU in a wide range of changes in their thermal load.

The specified task and technical result is ensured by the fact that in the steam drum KU containing a vertical duct with a non-equilateral rectangular cross-section, horizontal packages of evaporating, superheater and water heating surfaces and separation drums located outside the duct along its longer walls are placed inside the specified duct, according to of the utility model, at least one VPN package is divided into at least two sections connected in parallel along the water, each of which It is equipped with independent disconnecting authorities for water and gases. At the same time, each hot-water section can be composed of horizontally located Field pipes with paired inlet and outlet prefabricated chambers taken out of the flue. The organ that shuts off the water-heating section by gas can be made in the form of a horizontal roller shutter installed above the section with a controlled electric drive outside the gas duct.

The causal relationship between the main distinguishing features and the specified technical result is as follows. The separation of each VPN package into sections connected in parallel through water, each of which is equipped with independent disconnecting bodies for water and gases, allows sections remaining after shutting down another part to have optimal water and gas flow velocities under a changed load mode, which ensures the indicated higher technical result.

Brief Description of the Drawings

Figure 1 schematically shows the KU according to the utility model; figure 2 is a view along Α-A of figure 1 on the partitioned packages of the CCP; figure 3 is a section of the CCP in an enlarged scale.

Detailed description of utility model

Steam drum KU (figure 1) contains a vertical duct 1 with a lower supply of exhaust gases from a gas turbine installation (GTU) and the removal of flue gases in its upper part. The gas duct 1 has a non-equilateral rectangular cross-section (not shown) with the location of the separation drums 2 outside the gas duct 1 along longer walls (perpendicular to the plane of the drawing). Inside the gas duct 1, horizontal packages of convective heating surfaces are placed from bottom to top (in the direction of decreasing temperature of hot gases): superheater 3, high-pressure steam generator 4, high-pressure water economizer 5, low-pressure steam generator 6, low-pressure water economizer 7 and HPC 8. At the same time in this example, the package of CCP 8 is divided into three sections 9 connected in parallel in water (Fig. 2), each of which is equipped with independent disconnecting bodies for water and gases in the form of, respectively, water shutoff valves 10 (fi .2) and rolling shutters 11 with a controlled electric drive 12 (Fig. 1), taken outside the gas duct 1. Each hot-water section 9 is composed of horizontally located Field 13 pipes with paired inlet and outlet prefabricated chambers 14, 15, respectively (Figs. 1, 3 ), taken outside the duct 1, the inner pipe 16 and the outer finned tube 17 (figure 3).

Operation of the recovery boiler

Selected as an example KU according to the utility model works as follows. The exhaust gases of the gas turbine enter the gas duct 1 and move in it from the bottom up in the direction of the arrows indicated in the drawing (Fig. 1), heating the convective heating surfaces 3-8 installed in it. Condensate, having passed GPK 8, low and high pressure deaerator columns and feed pumps (not shown in the drawing) are supplied to the low and high pressure water economizers 7 and 5, after which the feed water enters the respective separation drums 2. In the circuits connected to them high and low pressure circulating with IPN 4.6 steam is generated, which, having passed the corresponding packages of superheater 3, is supplied to a steam turbine (not shown). Part of the condensate heated in the HPA can be sent to the thermal consumer. The necessary adjustment of the operating modes of the CCP for water and heating with hot gases is provided by shut-off water valves 10 (Fig. 2) and shutters 11 (Fig. 1).

Industrial application

A KU was designed for the all-mode PTU 25/20, in which at a rated power without afterburning the fuel in front of the boiler and the CCP at an outside temperature of -3.1 ° C, 0.9 Gcal / h of heat is released, and when the fuel is afterburned only before the CCP under the same conditions, 9 Gcal / h is released. Corresponding to this range of heat generation, the condensate flow rate through the CHP will vary from 38 to 199 t / h.

Claims (3)

1. A steam drum recovery boiler containing a vertical flue with a non-equilateral rectangular cross-section, horizontal packages of evaporating, superheater and water heating surfaces and separation drums located outside the flue along its longer walls, placed inside the specified flue, characterized in that at least one of the packages of the heating surfaces is divided into at least two sections connected in parallel along the water, each of which is independently equipped by other water and gas disconnecting authorities. 2. The steam recovery boiler according to claim 1, characterized in that each water-heating section is composed of horizontally located Field pipes with paired inlet and outlet prefabricated chambers, taken outside the flue. 3. The steam recovery boiler according to claim 1 or 2, characterized in that the organ that disables the water heating section for gas is made in the form of a horizontal roller shutter installed above the section with a controlled electric drive outside the duct.

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