Hot air system for heating primary cold air and secondary cold air
By heating the hot air system of primary and secondary cold air, the problems of boiler air preheater blockage and low temperature corrosion are solved, and the long-term safe and stable operation of the boiler and the reduction of production costs are achieved.
Patent Information
- Application Number
- CN202323635785.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-29
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2033-12-29
AI Technical Summary
The boiler air preheater is blocked and accumulated dust due to low temperature corrosion, which increases the labor intensity and maintenance costs of production workers.
A hot air system is designed to heat primary and secondary cold air. The primary and secondary air preheaters are connected through the primary and secondary air fans. The hot air is circulated to the boiler furnace and air chamber to increase the inlet temperature of the blower and prevent sulfuric acid steam from condensing.
It effectively increases the smoke exhaust temperature of the boiler, reduces the blockage of the heated surface at the tail and the low-temperature corrosion, reduces the workload and maintenance costs of the furnace shutdown and maintenance, and ensures the long-term safe and stable operation of the boiler.
Smart Images
Figure CN222143121U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of energy utilization, and in particular relates to a hot air system for heating primary cold air and secondary cold air. Background Art
[0002] Since the boiler was put into operation, every time the boiler was shut down for inspection, it was found that the air preheater of the boiler was seriously clogged with dust. After each shutdown, the large amount of dust in the air preheater had to be manually cleaned, and the air preheater pipes with serious blockage had to be cleaned with high-pressure water, which not only increased the labor intensity of the production workers, but also caused an increase in the cost of boiler inspection and maintenance.
[0003] The main reason for the blockage of the boiler air preheater is that the boiler has been running at low load for a long time, and the exhaust gas temperature is low, resulting in low-temperature corrosion. The sulfur in the boiler fuel is burned to produce sulfur dioxide, which is further oxidized to sulfur trioxide under the action of the catalyst. Sulfur trioxide and water vapor in the flue gas generate sulfuric acid vapor. The presence of sulfuric acid vapor significantly increases the dew point of the flue gas.
[0004] Since the flue gas temperature in the air preheater is not high and the wall temperature is often lower than the flue gas dew point, sulfuric acid vapor will condense on the air preheater tube wall, causing sulfuric acid low-temperature corrosion. A large amount of sulfate produced by low-temperature corrosion will be adsorbed on the tube wall and continuously accumulated, gradually blocking part of the air preheater tube, thus causing a large amount of dust accumulation in the air preheater.
[0005] The original design of the boiler did not include a heater or other cold air heating measures at the blower inlet. The lowest air temperature at the blower inlet in winter could reach more than 20 degrees below zero. A large amount of cold air entered the boiler's low-stage air preheater and exchanged heat with the flue gas, causing the boiler's exhaust temperature to further drop, thereby further aggravating the low-temperature corrosion of the heating surface at the rear of the boiler.
[0006] In order to solve the problems of low boiler blower inlet temperature, low exhaust gas temperature and serious low-temperature corrosion of the rear heating surface, the management personnel repeatedly analyzed and discussed, combined with relevant information and experience, and proposed a hot air system for heating primary cold air and secondary cold air. Utility Model Content
[0007] The technical problem to be solved by the utility model is to solve the problems of low exhaust temperature of boiler smoke, serious blockage and ash accumulation on the rear heating surface, and serious low-temperature corrosion.
[0008] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0009] A hot air system for heating primary cold air and secondary cold air comprises a primary air fan, a secondary air fan, an air preheater and a boiler, wherein the primary air fan and the secondary air fan are both connected to the primary air preheater through an air outlet, one end of the secondary air preheater is connected to the furnace of the boiler through a pipeline, one end of the secondary air preheater is connected to the wind chamber of the boiler through a pipeline, and the outlet end of the secondary air preheater is respectively connected to the air intake of the primary air fan and the secondary air fan through a pipeline.
[0010] The secondary air preheater delivers hot secondary air to the furnace through a pipeline.
[0011] The secondary air preheater delivers hot primary air to the air chamber through a pipeline.
[0012] The secondary air preheater delivers secondary hot air to the secondary air fan.
[0013] The secondary air preheater delivers primary hot air to the primary air fan.
[0014] The air preheater comprises a primary air preheater and a secondary air preheater, and the primary air preheater is connected to the air inlet end of the secondary air preheater through two pipelines.
[0015] Compared with the prior art, the utility model has the following beneficial effects:
[0016] After this system was put into use, it solved the problems of low exhaust temperature of some boilers, serious blockage and ash accumulation on the rear heating surface, and severe low-temperature corrosion, thereby ensuring the long-term safe and stable operation of the boiler. The implementation of the technical transformation project of the hot air recirculation pipeline of the boiler blower not only greatly reduced the cleaning workload of production workers during shutdown and maintenance, but also reduced the cost of boiler maintenance and repair, and to a certain extent reduced production costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of an embodiment of the utility model. DETAILED DESCRIPTION
[0018] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.
[0019] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.
[0020] Example 1
[0021] like Figure 1 As shown, the utility model discloses a hot air system for heating primary cold air and secondary cold air, comprising a primary air fan, a secondary air fan, an air preheater and a boiler, wherein the primary air fan and the secondary air fan are both connected to the primary air preheater through an air outlet, one end of the secondary air preheater is connected to the furnace of the boiler through a pipeline, one end of the secondary air preheater is connected to the wind chamber of the boiler through a pipeline, and the outlet end of the secondary air preheater is respectively connected to the air intake of the primary air fan and the secondary air fan through pipelines; the secondary air preheater conveys hot secondary air to the furnace through the pipeline; the secondary air preheater conveys hot primary air to the wind chamber through the pipeline; the secondary air preheater conveys secondary hot air to the secondary air fan; the secondary air preheater conveys primary hot air to the primary air fan, and the air preheater comprises a primary air preheater and a secondary air preheater, and the primary air preheater is connected to the air inlet end of the secondary air preheater through two pipelines.
[0022] An air duct is led out from the hot secondary air duct and connected to the inlet of the primary fan and the secondary fan respectively. When the temperature is too low and the inlet air temperature of the primary and secondary fans is low, the hot secondary air is mixed with the inlet air of the primary and secondary fans to increase the overall air temperature and prevent condensation in the air preheater.
[0023] After this system was put into use, it solved the problems of low exhaust temperature of some boilers, serious blockage and ash accumulation on the rear heating surface, and severe low-temperature corrosion, thereby ensuring the long-term safe and stable operation of the boiler. The implementation of the technical transformation project of the hot air recirculation pipeline of the boiler blower not only greatly reduced the cleaning workload of production workers during shutdown and maintenance, but also reduced the cost of boiler maintenance and repair, and to a certain extent reduced production costs.
[0024] The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the embodiments above is only applicable to help understand the principles of the embodiments of the present invention.
Claims
1. A hot air system for heating primary cold air and secondary cold air, comprising a primary air fan, a secondary air fan, an air preheater and a boiler, Features: The air preheater includes a primary air preheater and a secondary air preheater, the primary air preheater is connected to the air inlet end of the secondary air preheater through two pipes, the primary air fan and the secondary air fan are both connected to the primary air preheater through an air outlet, one end of the secondary air preheater is connected to the furnace of the boiler through a pipe, one end of the secondary air preheater is connected to the wind chamber of the boiler through a pipe, and the outlet end of the secondary air preheater is respectively connected to the air intake of the primary air fan and the secondary air fan through pipes.
2. A hot air system for heating primary cold air and secondary cold air according to claim 1, Features: The secondary air preheater delivers hot secondary air to the furnace through a pipeline.
3. A hot air system for heating primary cold air and secondary cold air according to claim 2, Features: The secondary air preheater delivers hot primary air to the air chamber through a pipeline.
4. A hot air system for heating primary cold air and secondary cold air according to claim 3, Features: The secondary air preheater delivers secondary hot air to the secondary air fan.
5. A hot air system for heating primary cold air and secondary cold air according to claim 4, Features: The secondary air preheater delivers primary hot air to the primary air fan.