CN205535744U - Gas boiler air and moisturizing circulation system of preheating - Google Patents

Abstract

The utility model discloses a gas boiler air and moisturizing circulation system of preheating, the furnace body bottom sets up furnace, and the furnace body middle part sets up heating calancria and water cavity, and furnace body upper portion sets up the chimney, be provided with preheating water tank on furnace body upper portion, preheating water tank is provided with inlet tube and circulating pipe, the moisturizing mouth intercommunication of this circulating pipe and water cavity, the heating calancria is deepening implemented and is gathered behind preheating water tank in the chimney, be located preheating water tank's part or whole heating calancria, the intrinsic preheating of air chamber of seal cover, air inlet duct communicates in the furnace bottom behind the preheating of air chamber. The utility model provides a preheating water tank can assemble in boiler furnace top, advances the outlet flue that the combustion chamber is connected to the mouth, at the operation in -process, carries out the heat exchange with cold water in the sump, make full use of heat energy, the water cavity internal energy of preheating the back reentrant combustion chamber of water is heated rapidly, has promoted efficiency.

Description

Gas boiler air and make-up water circulation preheating system

technical field

The utility model relates to the technical field of boiler circulation preheating, in particular to a gas-fired boiler air and water supply circulation preheating system.

Background technique

A boiler is a device that uses the heat energy of fuel or other energy sources to heat water into hot water or steam. The hot water or steam generated in the boiler can directly provide the required thermal energy for industrial production and people's life, and can also be converted into mechanical energy through a steam power plant, or converted into electrical energy through a generator. Boilers that provide hot water are called hot water boilers, which are mainly used in daily life, and also have a small amount of application in industrial production.

The boiler in the prior art is mainly composed of a combustion chamber and a water chamber. The water chamber is provided with a water inlet and a water outlet. Cold water enters the boiler water chamber through the water inlet. After the water is discharged from the water outlet, it is applied to people's life and production. The disadvantages of this traditional boiler are high energy consumption, heavy pollution and low efficiency.

In addition, the air preheater is a device that uses the waste heat of the flue gas to heat the combustion air. Since the fuel of biomass boilers has a large water content, air preheating is particularly important for sugar factory boilers and other biomass-fired boilers whose fuel is bagasse. Using the boiler air preheater to input hot air into the boiler can increase the temperature of the furnace, improve the combustion conditions, reduce the incomplete combustion loss of the fuel, increase the output of the boiler, and further improve the thermal efficiency of the boiler. There is an existing boiler air preheater. The technical solution of the boiler air preheater is: it includes a heat exchanger shell mounted on a bracket, and the heat exchanger shell is provided with a flue gas inlet and a flue gas outlet. Air port, the heat exchanger housing is provided with a heat exchanger core, and the heat exchanger core is respectively connected to the heat exchanger housing through the air inlet and the air outlet connected at both ends; The heat exchanger core has a plurality of heat exchange tubes inserted between two mounting plates, and the heat exchange tubes are bare tubes. This kind of boiler air preheater has the following disadvantages during use: the boiler air preheater performs heat exchange through the flow of air in the heat exchange tube and the flue gas flows outside the heat exchange tube, the heat exchange tube is a bare tube, and the air The flow in the heat exchange tube is laminar flow, the heat transfer coefficient in the tube is low, and the heat exchange effect of the heat exchanger is not good, resulting in poor overall heat exchange effect of the boiler air preheater.

Utility model content

The utility model aims at the problem of serious waste heat waste existing in the current gas boiler, and provides an air and water supply cycle preheating system for the gas boiler.

In order to achieve the above purpose, the following technical solutions are adopted: a gas-fired boiler air and water replenishment circulation preheating system, including a furnace body, a furnace chamber is arranged at the bottom of the furnace body, a heating pipe and a water chamber are arranged in the middle of the furnace body, and a chimney is arranged at the upper part of the furnace body; The upper part of the body is provided with a preheating water tank, and the preheating water tank is provided with a water inlet pipe and a circulating water pipe. The circulating water pipe is connected with the water supply port of the water cavity; On part or all of the heating pipes inside, the sealing sleeve is inherent in the air preheating chamber, and the air input pipe is connected to the bottom of the furnace after passing through the air preheating chamber.

The air preheating chambers are sequentially connected in series or in parallel.

A blower is arranged on the pipeline for transporting air.

A heat insulation layer is arranged between the preheating water tank and the furnace body. A heat insulation layer is provided on the outside or inside of the preheating water tank and the furnace body.

The outer wall of the heating calandria is provided with protruding heat conduction fins distributed along the axial direction.

Beneficial effects: the preheating water tank in the utility model can be assembled above the combustion chamber of the boiler, and the smoke inlet is connected to the smoke outlet of the combustion chamber. The cold water in the water tank performs heat exchange, which not only makes full use of heat energy, but also reduces the pollution of the flue gas to the environment. In addition, after preheating, the water can be heated quickly when it enters the water chamber of the combustion chamber, which improves the efficiency.

The air heat exchange tube is used to improve the heat transfer coefficient inside and outside the tube, forming a double enhanced heat transfer method with external strength and internal strength; the air entering the preheating tank undergoes heat exchange with the flue gas, and then enters the upper heat exchange tube box before entering the upper heat exchange tube box in the air passage Mixing makes it evenly heated, the heat transfer effect is good, and the total heat transfer coefficient is increased several times. Due to the use of protruding heat conduction fins on the outer surface, when the flue gas enters the heat exchanger shell and passes over the fins of the heat exchange tube, the heat transfer coefficient outside the heat exchange tube is greater than that inside the heat exchange tube, and the temperature of the tube wall is high. .

Description of drawings

Fig. 1 is the structural representation of the utility model;

FIG. 2 is a schematic diagram of the A-A section structure in FIG. 1 .

In the figure, the number 1 is the furnace body, 2 is the preheating water tank, 3 is the heat insulation layer, 4 is the furnace, 5 is the natural gas pipe, 6 is the heating pipe, 7 is the chimney, 8 is the water cavity, and 9 is the water inlet pipe. 10 is a circulating water pipe, 11 is a steam exhaust pipe, 12 is an air input pipe, 13 is an air output pipe, 14 is an air preheating chamber, and 15 is a blower fan.

detailed description

Embodiment 1: Referring to the gas-fired boiler air and water supply circulation preheating system described in FIG. 1 , a furnace is arranged at the bottom of the furnace body 1 , a heating pipe 6 and a water chamber are arranged in the middle of the furnace body 1 , and a chimney 7 is arranged at the upper part of the furnace body 1 .

In addition, a preheating water tank 2 is provided on the upper part of the furnace body 1, and the preheating water tank 2 is provided with a water inlet pipe and a circulating water pipe, and the circulating water pipe communicates with the water supply port of the water chamber; Summarize in chimney 7 afterward.

Referring to FIG. 2 , on part or all of the heating pipes 6 in the preheating water tank 2 , the sealing sleeve has an inherent air preheating chamber 14 , and the air input pipe passes through the air preheating chamber 14 and communicates with the bottom of the furnace. A blower is arranged on the pipeline for transporting air.

The air preheating chambers 14 are sequentially connected in series or in parallel.

Embodiment 2: On the basis of Embodiment 1, a heat insulating layer 3 is provided between the preheating water tank 2 and the furnace body 1 . A thermal insulation layer is arranged on the outside or inside of the preheating water tank 2 and the body of heater 1 .

Embodiment 3: On the basis of Embodiment 1, the outer wall of the heating pipe 6 is provided with protruding heat conduction fins distributed along the axial direction.

Claims (6)

1. gas fired-boiler air and a moisturizing circulation pre-heating system, including body of heater, bottom of furnace body arranges burner hearth, arranges heating calancria and water cavity in the middle part of body of heater, and upper of furnace body arranges chimney；It is characterized in that: upper of furnace body is provided with preheating water tank, preheating water tank is provided with water inlet pipe and circulating water pipe, and this circulating water pipe connects with the water supplement port of water cavity；Described heating calancria is deeply implemented and is summarized in chimney after preheating water tank；Being positioned on the part or all of heating calancria of preheating water tank, the intrinsic air-pre-heating cavity of sealing shroud, air inlet duct is communicated in burner hearth bottom after air-pre-heating cavity.

Gas fired-boiler air the most according to claim 1 and moisturizing circulation pre-heating system, is characterized in that: described air-pre-heating cavity is sequentially connected in series or side by side.

Gas fired-boiler air the most according to claim 1 and moisturizing circulation pre-heating system, is characterized in that: be provided with blower fan on the pipeline of air for carrying.

Gas fired-boiler air the most according to claim 1 and moisturizing circulation pre-heating system, is characterized in that: be provided with thermal insulation layer between described preheating water tank and body of heater.

Gas fired-boiler air the most according to claim 1 and moisturizing circulation pre-heating system, is characterized in that: outside described preheating water tank and body of heater or inner side is provided with thermal insulation layer.

Gas fired-boiler air the most according to claim 1 and moisturizing circulation pre-heating system, is characterized in that: the outer wall of described heating calancria is provided with axially distributed protrusion conducting strip.