CN-121993782-A - Waste heat boiler flue gas waste heat recycling system

CN121993782ACN 121993782 ACN121993782 ACN 121993782ACN-121993782-A

Abstract

The invention provides a flue gas waste heat recycling system of a waste heat boiler, which belongs to the technical field of flue gas waste heat recycling and comprises a combustion furnace, wherein a tail gas discharge end of the combustion furnace is connected with the waste heat boiler, the waste heat boiler comprises a boiler body, a water tank, a gas pressure sensor and a heat exchange device, wherein one end of the boiler body is communicated with the tail gas discharge end of the combustion furnace, the water tank is arranged at the top of the boiler body and is connected with a water supplementing pipe, and the gas pressure sensor is arranged in the water tank.

Inventors

HUANG SHIMIN
Xu Hongbang
Nie Lelin
CHEN WEIQUAN
LIU ZILONG
ZHANG JIAQIANG
WANG XIA

Assignees

山东齐成石油化工有限公司

Dates

Publication Date: 20260508
Application Date: 20260319

Claims (8)

1. The exhaust-heat boiler flue gas waste heat recycling system comprises a combustion furnace, wherein the exhaust gas discharge end of the combustion furnace is connected with an exhaust-heat boiler; The water tank is arranged at the top of the pot body, is connected with the water supplementing pipe and is internally provided with an air pressure sensor; The first heat exchanger is arranged on one side, close to air inlet, of the pot body and comprises a plurality of first heat exchange pipes which are arranged in an array, the bottoms of the first heat exchange pipes are communicated with the bottom of the water tank through water supply pipes, the tops of the first heat exchange pipes are communicated with the water tank through water return pipes, first heat conduction fins are sleeved outside the first heat exchange pipes in a rotating mode, and the first heat conduction fins are driven to rotate by a first driving mechanism; the second heat exchanger is arranged on one side, far away from the air inlet end, of the pot body and comprises a plurality of second heat exchange tubes arranged in an array, the bottoms of the second heat exchange tubes are communicated with the bottom of the water tank through water supply pipes, the tops of the second heat exchange tubes are communicated with the water tank through water return pipes, second heat conduction fins are sleeved outside the second heat exchange tubes in a rotating mode, and the second heat conduction fins are driven to rotate by a second driving mechanism; the steam superheater is arranged in the boiler body and is positioned between the first heat exchanger and the second heat exchanger, and comprises a first steam pipe and a second steam pipe which are sequentially arranged along the flow direction of tail gas, wherein an inlet of the first steam pipe is communicated with the top of the water tank, an outlet of the first steam pipe is communicated with an inlet of the second steam pipe and a steam discharge pipe through an adjusting part, and an outlet of the second steam pipe is communicated with the steam discharge pipe; The adjusting part enables the first steam pipe and the second steam pipe to be always conducted, and can control the on-off state of the first steam pipe and the steam discharge pipe.
2. The flue gas waste heat recycling system of the waste heat boiler according to claim 1, wherein when the pressure value detected by the air pressure sensor is larger than a first preset value, the first heat conduction fins and the second heat conduction fins are controlled to rotate to be parallel to the flow direction of the tail gas, so that the tail gas can pass through quickly, and the pressure of the waste heat boiler is reduced; when the pressure value detected by the air pressure sensor is larger than a second preset value, the second preset value is larger than the first preset value, the adjusting part acts to keep the first steam pipe and the second steam pipe conducting and simultaneously control the conduction of the first steam pipe and the steam discharge pipe, and the pressure of steam in the water tank is relieved; When the pressure value detected by the air pressure sensor is smaller than a first preset value, the first heat conduction fins and the second heat conduction fins are controlled to rotate to be perpendicular to the flowing direction of the tail gas, the flow speed of the tail gas is reduced, and the steam pressure in the water tank is increased.
3. The flue gas waste heat recycling system of a waste heat boiler according to claim 2, wherein the adjusting part comprises a U-shaped connecting piece, one end of the U-shaped connecting piece is communicated with the outlet of the first steam pipe, the other end of the U-shaped connecting piece is communicated with the inlet of the second steam pipe, a branch pipe is arranged on the side wall of the middle of the adjusting part, the branch pipe is communicated with the steam discharge pipe through a connecting pipe, a conical hole is formed in the side wall of the U-shaped connecting piece corresponding to the branch pipe, and a plugging piece is arranged in the conical hole and connected with the inner wall of the branch pipe through an elastic piece.
4. The flue gas waste heat recycling system of a waste heat boiler according to claim 3, wherein the first driving mechanism comprises a first rotating frame fixedly connected to the outer side of the first heat conducting fin, and a first guide piece is arranged on the first rotating frame; the first pushing piece is arranged in the pot body in a sliding way, a pushing groove matched with the first guiding piece is formed in the first pushing piece, and the first pushing piece is pushed to slide by the first electric push rod.
5. The flue gas waste heat recycling system of a waste heat boiler according to claim 4, wherein the second driving mechanism comprises a second rotating frame fixedly connected to the outer side of the second heat conducting fin, and a second guide piece is arranged on the second rotating frame; the second pushing piece is arranged in the pot body in a sliding way, a pushing groove matched with the second guiding piece is formed in the second pushing piece, and the second pushing piece is pushed to slide by the second electric push rod.
6. The flue gas waste heat recycling system of a waste heat boiler according to claim 5, further comprising a plurality of air preheating pipes arranged in an array, wherein the air preheating pipes are positioned at the tail end of the boiler body and penetrate through the whole boiler body, the top of each air preheating pipe is connected with a blower, and the other end of each air preheating pipe is connected with an air inlet of the combustion furnace.
7. The waste heat boiler flue gas waste heat recovery system of claim 6, wherein the second heat exchange tube is smaller in caliber than the first heat exchange tube.
8. The waste heat boiler flue gas waste heat recycling system according to claim 7, further comprising a water pump, wherein the water pump is arranged at the inner bottom of the water tank, and the first heat exchange tube The water supply pipe and the second heat exchange pipe water supply pipe are communicated with a water pump at the inner bottom of the water tank.

Description

Waste heat boiler flue gas waste heat recycling system Technical Field The invention belongs to the technical field of flue gas waste heat recycling, and particularly relates to a flue gas waste heat recycling system of a waste heat boiler. Background In the industrial production process, when the combustion furnace burns fuel to generate high-temperature tail gas, a large amount of waste heat can be carried, if the tail gas is directly discharged into the atmosphere, serious energy waste can be caused, the environment temperature can be increased, heat pollution is caused, and the development concepts of energy conservation, emission reduction, green and low carbon are not met. At present, the existing waste heat boiler flue gas waste heat recycling system has the problems of low heat exchange efficiency and insufficient waste heat recovery, most systems only have a single-stage heat exchange structure, cannot comprehensively recover step waste heat in tail gas, and a large amount of medium-low temperature waste heat is directly wasted. Aiming at the defects in the prior art, a waste heat boiler flue gas waste heat recycling system which can realize waste heat step recovery, automatic pressure adjustment and controllable heat exchange efficiency, has a stable structure and is reliable in operation is needed to solve the defects in the prior art, improve the energy utilization rate and ensure the safe and stable operation of the system. Accordingly, in order to solve the above problems, it is necessary to provide a flue gas waste heat recycling system for a waste heat boiler to solve the above technical problems. Disclosure of Invention The invention aims to provide a flue gas waste heat recycling system of a waste heat boiler so as to solve the technical problems. The exhaust-heat boiler flue gas waste heat recycling system comprises a combustion furnace, wherein the exhaust gas discharge end of the combustion furnace is connected with an exhaust-heat boiler, and the exhaust-heat boiler comprises a boiler body, one end of which is communicated with the exhaust gas discharge end of the combustion furnace; The water tank is arranged at the top of the pot body, is connected with the water supplementing pipe and is internally provided with an air pressure sensor; The first heat exchanger is arranged on one side, close to air inlet, of the pot body and comprises a plurality of first heat exchange pipes which are arranged in an array, the bottoms of the first heat exchange pipes are communicated with the bottom of the water tank through water supply pipes, the tops of the first heat exchange pipes are communicated with the water tank through water return pipes, first heat conduction fins are sleeved outside the first heat exchange pipes in a rotating mode, and the first heat conduction fins are driven to rotate by a first driving mechanism; the second heat exchanger is arranged on one side, far away from the air inlet end, of the pot body and comprises a plurality of second heat exchange tubes arranged in an array, the bottoms of the second heat exchange tubes are communicated with the bottom of the water tank through water supply pipes, the tops of the second heat exchange tubes are communicated with the water tank through water return pipes, second heat conduction fins are sleeved outside the second heat exchange tubes in a rotating mode, and the second heat conduction fins are driven to rotate by a second driving mechanism; the steam superheater is arranged in the boiler body and is positioned between the first heat exchanger and the second heat exchanger, and comprises a first steam pipe and a second steam pipe which are sequentially arranged along the flow direction of tail gas, wherein an inlet of the first steam pipe is communicated with the top of the water tank, an outlet of the first steam pipe is communicated with an inlet of the second steam pipe and a steam discharge pipe through an adjusting part, and an outlet of the second steam pipe is communicated with the steam discharge pipe; The adjusting part enables the first steam pipe and the second steam pipe to be always conducted, and can control the on-off state of the first steam pipe and the steam discharge pipe. As a preferable technical scheme of the invention, when the pressure value detected by the air pressure sensor is larger than a first preset value, the first heat conduction fins and the second heat conduction fins are controlled to rotate to be parallel to the flowing direction of the tail gas, so that the tail gas can quickly pass through, and the pressure of the waste heat boiler is reduced; when the pressure value detected by the air pressure sensor is larger than a second preset value, the second preset value is larger than the first preset value, the adjusting part acts to keep the first steam pipe and the second steam pipe conducting and simultaneously control the conduction of the first steam pipe and the steam discharge pipe, and