CN-224229753-U - Boiler recirculation system

CN224229753UCN 224229753 UCN224229753 UCN 224229753UCN-224229753-U

Abstract

The invention relates to a boiler recycling system which comprises a boiler component, a deaerator, a recycling main path, a recycling branch path and two regulating valves, wherein the deaerator comprises a water outlet and a water inlet, the two ends of the water outlet path are respectively connected with the water outlet and the boiler component, the recycling main path is respectively connected with the water outlet and the water inlet, the recycling branch path can be connected with the recycling main path in an opening and closing mode, when the target load of the boiler component is lower than a load threshold value, water in the water outlet path can enter the deaerator through the recycling branch path, the two regulating valves are respectively arranged on the recycling main path and the recycling branch path, each regulating valve comprises a movable valve core, a valve seat and a guide cage, the valve seat and the guide cage are annularly arranged on the outer side of the valve core and are mutually connected, inward protruding guide ribs are arranged on the inner side of the guide cage at intervals along the extending direction of the guide cage, and a plurality of bosses corresponding to the guide ribs are arranged on the valve core at intervals. The damage rate of the recirculation regulating valve of the boiler component is reduced, and the efficiency of the generator set is improved.

Inventors

ZHANG JINGQIAO
YANG ZHONGFEI
DU XIAOJUN
ZHANG YAN
ZHANG TAO
WANG XIAO

Assignees

国电电力发展股份有限公司
国能锦界能源有限责任公司

Dates

Publication Date: 20260512
Application Date: 20250521

Claims (10)

1. A boiler recirculation system, comprising: A boiler assembly; The deaerator comprises a water outlet and a water inlet; The two ends of the water outlet pipeline are respectively connected with the water outlet and the boiler component; The two ends of the recirculation main path are respectively connected with the water outlet pipeline and the water inlet; A recirculation bypass openably bypass the recirculation main, through which water in the water outlet line can enter the deaerator when the target load of the boiler assembly is below a load threshold, through which water in the water outlet line can enter the deaerator when the target load of the boiler assembly is not below the load threshold, and The two regulating valves are respectively arranged on the recirculation main path and the recirculation branch path, each regulating valve comprises a movable valve core, a valve seat and a guide cage, the valve seats and the guide cages are annularly arranged on the outer sides of the valve cores and are mutually connected, inward protruding guide ribs are arranged on the inner sides of the guide cages at intervals along the extending direction of the guide cages, and a plurality of bosses corresponding to the guide ribs are arranged on the valve cores at intervals.
2. The boiler recirculation system according to claim 1, wherein a gasket is provided on the valve seat in a ring, a sealing head is formed at an end of the valve core, and a sealing slope capable of being fitted with the gasket is formed on the sealing head.
3. The boiler recirculation system of claim 2, wherein the sealing head further has a first diversion ramp formed thereon, the first diversion ramp being disposed below the sealing ramp.
4. The boiler recirculation system according to claim 2, wherein the gasket comprises a metal gasket and a rubber gasket, wherein the metal gasket is connected to the valve seat, the rubber gasket is provided inside the metal gasket, and the sealing bevel is contactable with the rubber gasket.
5. The boiler recirculation system of claim 2, wherein a side of the boss proximate the sealing head is provided with a second diversion ramp.
6. The boiler recirculation system of claim 1, wherein a bottom of the valve seat communicates with the water outlet and a top of the valve seat communicates with the water inlet.
7. The boiler recirculation system according to claim 1, characterized in that an isolation valve is provided on the recirculation branch.
8. The boiler recycling system according to claim 7, characterized in that the number of the isolation valves is two and is provided on both sides of the regulating valve, respectively.
9. The boiler recirculation system according to claim 1, characterized in that the recirculation main circuit is provided with a three-way valve, through which the recirculation branch circuit is connected to the recirculation main circuit.
10. The boiler recirculation system of claim 1, wherein a turbine feedwater pump is connected to the outlet line, the turbine feedwater pump being located upstream of the junction of the recirculation main line and the outlet line.

Description

Boiler recirculation system Technical Field The present disclosure relates to the technical field of thermal power boiler circulation, and in particular, to a boiler recirculation system. Background The recirculation regulating valve of the generator set in a large boiler is a very important fluid control unit of a thermal power plant. In the running process of the generator set, the requirement on the regulation performance of the recirculation valve is high. Because the pressure difference between the front and the back of the valve is large, the valve is in a strong cavitation working condition for a long time, the valve is extremely easy to leak, and components in the valve are damaged, so that the valve cannot be used normally, the service life of the valve is shortened, the power generation efficiency of a generator set is also influenced, and the safe and economic operation of a power plant is influenced. Disclosure of utility model An object of the present disclosure is to provide a boiler recirculation system to solve the problem that the recirculation regulating valve of the boiler assembly is vulnerable to influence on the efficiency of the generator set. To achieve the above object, the present disclosure provides a boiler recycling system, comprising: A boiler assembly; The deaerator comprises a water outlet and a water inlet; The two ends of the water outlet pipeline are respectively connected with the water outlet and the boiler component; The two ends of the recirculation main path are respectively connected with the water outlet pipeline and the water inlet; A recirculation bypass openably bypass the recirculation main, through which water in the water outlet line can enter the deaerator when the target load of the boiler assembly is below a load threshold, through which water in the water outlet line can enter the deaerator when the target load of the boiler assembly is not below the load threshold, and The two regulating valves are respectively arranged on the recirculation main path and the recirculation branch path, each regulating valve comprises a movable valve core, a valve seat and a guide cage, the valve seats and the guide cages are annularly arranged on the outer sides of the valve cores and are mutually connected, inward protruding guide ribs are arranged on the inner sides of the guide cages at intervals along the extending direction of the guide cages, and a plurality of bosses corresponding to the guide ribs are arranged on the valve cores at intervals. Optionally, a sealing gasket is arranged on the valve seat in a ring mode, a sealing head is formed at the end portion of the valve core, and a sealing inclined surface which can be attached to the sealing gasket is formed on the sealing head. Optionally, a first diversion inclined plane is further formed on the sealing head, and the first diversion inclined plane is arranged below the sealing inclined plane. Optionally, the sealing gasket comprises a metal sealing gasket and a rubber sealing gasket, wherein the metal sealing gasket is connected with the valve seat, the rubber sealing gasket is arranged on the inner side of the metal sealing gasket in a surrounding mode, and the sealing inclined surface can be in contact with the rubber sealing gasket. Optionally, a second diversion inclined plane is arranged on one side of the boss, which is close to the sealing head. Optionally, the bottom of the valve seat is communicated with the water outlet, and the top of the valve seat is communicated with the water inlet. Optionally, an isolation valve is provided on the recirculation branch. Optionally, the number of the isolation valves is two, and the isolation valves are respectively arranged at two sides of the regulating valve. Optionally, a three-way valve is disposed on the recirculation main path, and the recirculation branch path is connected with the recirculation main path through the three-way valve. Optionally, a steam turbine feed pump is connected to the water outlet pipeline, and the steam turbine feed pump is located upstream of the connection between the recirculation main pipeline and the water outlet pipeline. Through the technical scheme, different pipelines are adopted for flow regulation according to different target loads of the boiler assembly, so that when the target loads are lower than a load threshold value, the flushing of the regulating valve on the recirculation main path is reduced through the regulation of the regulating valve on the recirculation branch path, the service life of the regulating valve on the recirculation main path can be prolonged, and the maintenance cost is reduced. In addition, the regulating valve is matched with the valve core provided with the boss through the guide cage provided with the guide rib, so that gaps between the valve core and the guide cage are reduced, the liquid flow rate in the regulating valve can be reduced, the possibility of strong flushing of water flow at