CN204534546U - Biomass boiler environmental protection and energy saving control system - Google Patents

Abstract

The utility model discloses a kind of biomass boiler environmental protection and energy saving control system, the exhaust gases passes be made up of biomass boiler, economizer, cyclone dust collectors, deduster, air-introduced machine, chimney, the water stream channel be made up of former water, ion-exchanger, softened water tank, deoxygenation pump, oxygen-eliminating device, feed pump, economizer, biomass boiler, it is characterized in that: be provided with flue gas circuit between described deduster and biomass boiler, described flue gas circuit is provided with air blast.The utility model is applicable to by increasing flue gas circuit on flue, high-temperature flue gas is sent back in biomass boiler again, because flue gas is high temperature, can effectively prevent the fire box temperature of biomass boiler from declining, coal-air ratio example can be regulated again simultaneously, reach the object of best combustion.

Description

Biomass boiler environmental protection and energy saving control system

technical field

The utility model relates to a biomass boiler, in particular to an environmental protection and energy saving control system for a biomass boiler.

Background technique

Biomass boiler is a boiler that uses biomass energy as fuel. As the name implies, the fuel put into the combustion chamber of the boiler is biomass fuel.

One of the key measures to improve boiler efficiency and economy is to maintain an appropriate ratio of fuel and air volume in the boiler combustion process, making it as close as possible to the optimal air-to-coal ratio, even if the boiler combustion process is in the best combustion state. But the incoming wind is cold air. When the air intake is increased, the temperature of the boiler furnace will be lowered. If the ratio of fuel to air volume in the combustion process of the boiler is too large from the optimum air-to-coal ratio, the heat loss in the combustion process will inevitably increase. At the same time, the boiler The temperature of the furnace will drop, reducing the economic and technical indicators of the boiler, and causing pollution to the surrounding environment, so it is difficult to adjust the temperature and air volume.

At present, the ones on the market (the Chinese patent application number CN201420369534.7 discloses a biomass boiler waste heat flue gas treatment system) consist of a biomass boiler, an economizer, a cyclone separator, a bag filter and an induced draft fan. It is characterized in that: a flue gas waste heat economizer is connected between the bag filter and the induced draft fan, and the flue gas waste heat economizer includes a cylinder body, a heat exchange tube arranged in the cylinder body, and a warm water inlet and a heating water inlet arranged on the outer wall of the cylinder body. exit. Although this boiler flue gas treatment system can recover flue gas heat, it does not help the temperature of the boiler furnace.

Utility model content

Aiming at the deficiencies in the prior art, the purpose of the utility model is to provide a high-efficiency, energy-saving and environment-friendly biomass boiler control system.

In order to achieve the above purpose, the utility model provides the following technical solutions: a biomass boiler environmental protection and energy saving control system, a flue gas channel composed of a biomass boiler, an economizer, a cyclone dust collector, a dust collector, an induced draft fan, and a chimney, The water flow channel is composed of raw water, ion exchanger, soft water tank, oxygen removal pump, deaerator, feed water pump, economizer, and biomass boiler. There is a flue gas circuit between the dust collector and the biomass boiler. A blower is provided on the flue gas circuit.

Preferably, it also includes a secondary economizer, the flue gas pipe and the water flow pipe of the secondary energy saving appliance, the flue gas pipe of the secondary economizer is arranged on the flue gas channel between the economizer and the cyclone dust collector, The water flow pipe of the secondary economizer is arranged on the water flow channel between the deaerator and the deaerator pump.

Preferably, it also includes a three-stage energy-saving device, the three-stage energy-saving appliance flue gas pipe, water flow pipe, the flue gas pipe of the three-stage energy-saving device is arranged on the flue gas channel between the dust collector and the induced draft fan; One end of the water flow pipe of the three-stage economizer is connected to the soft water tank through a circulation pump, and the other end is directly connected to the soft water tank.

Preferably, the biomass boiler is provided with two air inlets, each air inlet is provided with a blower, and the air inlets are respectively arranged at the bottom and middle of the biomass boiler.

Compared with the prior art, the beneficial effect of the utility model is: by adding a flue gas circuit on the flue gas pipeline, the high-temperature flue gas is sent back to the biomass boiler. Since the flue gas is high temperature, it can effectively prevent the biomass boiler from The temperature of the furnace decreases, and at the same time, the proportion of wind and coal can be adjusted to achieve the purpose of optimal combustion.

Description of drawings

Fig. 1 is the flue gas passage structure diagram of the embodiment of the environmental protection and energy saving control system of the biomass boiler of the present invention;

Fig. 2 is a water flow channel structure diagram of an embodiment of the environmental protection and energy saving control system for the biomass boiler of the present invention.

Detailed ways

Referring to Fig. 1 to Fig. 2, the embodiment of the biomass boiler control system of the utility model will be further described.

One of the key measures to improve boiler efficiency and economy is to maintain an appropriate ratio of fuel and air volume in the boiler combustion process, making it as close as possible to the optimal air-to-coal ratio, even if the boiler combustion process is in the best combustion state. If the ratio of fuel and air volume in the combustion process of the boiler is too far away from the optimum air-to-coal ratio, it will inevitably increase the heat loss in the combustion process and reduce the economic and technical indicators of the boiler. When increasing the air intake, because the incoming air is low temperature, it will The furnace of the biomass boiler cools down, and its temperature drop affects the combustion efficiency.

In order to achieve the goal of optimal combustion, an environmental protection and energy-saving control system for biomass boilers is designed. The flue gas channel consists of biomass boilers, economizers, cyclone dust collectors, dust collectors, induced draft fans, and chimneys. Raw water, A water flow channel composed of ion exchanger, soft water tank, deaeration pump, deaerator, feed water pump, economizer, and biomass boiler. There is a flue gas circuit between the dust collector and the biomass boiler, and the flue gas A blower is provided on the circuit.

By adding a flue gas circuit to the flue gas pipeline, the high-temperature flue gas is sent back to the biomass boiler. Since the flue gas is high-temperature, it can effectively prevent the furnace temperature of the biomass boiler from dropping, and at the same time adjust the proportion of wind and coal to achieve the optimum Best burning purpose. Control the excess air volume close to the ideal level without causing carbon monoxide and black smoke in the combustion process to achieve optimal control.

A secondary economizer is set between the economizer and the cyclone dust collector. The secondary economizer is also set on the water flow channel between the deaerator and the deaerator pump. The secondary economizer can recover the Heat is given to the water flow channel, heating the water flow. On the one hand, the temperature of the flue gas can be controlled, and at the same time, heat energy can be recovered, which is highly efficient and energy-saving.

There is a three-stage economizer between the dust collector and the induced draft fan, and the three-stage economizer is also installed on the self-circulating water flow channel of the soft water tank to further adjust the temperature of the flue gas and strengthen the effect of flue gas temperature control. At the same time, it can Provide warm water to the soft water tank. The self-circulating water flow channel of the soft water tank can make the water flow circulate. There is also a circulating pump on the self-circulating water flow channel to make the water temperature in the soft water tank even. water temperature.

The biomass boiler is equipped with two air inlets, and each air inlet is equipped with a blower. The air inlets are respectively set at the bottom and middle of the biomass boiler. Through multiple air inlets, the air inlet at the bottom can supplement the furnace containing The amount of oxygen can adjust the air volume to make the fuel of the biomass boiler burn fully. The air inlet in the middle can adjust the temperature of the furnace of the biomass boiler to achieve the best combustion temperature, which is conducive to the repeated combustion of fuel and the full utilization of energy.

Use the waste heat of the flue gas to preheat the pipe water to be heated, recover the heat energy of the flue gas, prevent energy waste, recover the heat of the flue gas with cold water, and install a return fan at the bottom of the chimney to re-combust the incomplete combustion in the flue gas The flue gas is sent back to the biomass boiler through the return fan for re-combustion, making full use of biomass energy, followed by double dust removal through the cyclone dust collector and dust collector, and the chimney can control the amount of smoke emitted, which meets the emission standards and protects the environment.

The dust collector is equipped with an air compressor, and the air compressor blows off the smoke and dust in the dust collector through air pressure, preventing air pollution, and is highly efficient and environmentally friendly.

An ion exchanger is provided on the water supply pipe, and the ion exchanger is connected to a soft water tank. The soft water tank provides cold water for the three-stage economizer through a circulating pump, and receives warm water output by the three-stage economizer. The raw water is first It is turned into soft water through an ion exchanger, and the water can be preheated through a three-stage economizer, reducing the biomass energy required for heating cold water, and passing the preheated water to the next device.

The soft water tank provides cold water to the secondary economizer through the deaeration pump, and sends it to the deaerator. After passing through the secondary economizer, the cold water is reheated to save energy and prevent the energy in the flue gas from being wasted.

The outlet of the feed water pump is provided with a regulating valve, the regulating valve is connected in parallel with the bypass valve, and the feed water flow of the feed water pump can be automatically controlled through the two valves, the structure is simple and the control is convenient.

Claims (4)

1. An environmental protection and energy-saving control system for biomass boilers, a flue gas channel consisting of biomass boilers, economizers, cyclone dust collectors, dust collectors, induced draft fans, and chimneys, raw water, ion exchangers, soft water tanks, oxygen removal A water flow channel composed of a pump, a deaerator, a feed water pump, an economizer, and a biomass boiler is characterized in that a flue gas circuit is provided between the dust collector and the biomass boiler, and a blower is provided on the flue gas circuit . 2. The environmental protection and energy-saving control system for biomass boilers according to claim 1, characterized in that: it also includes a secondary economizer, the flue gas pipes and water flow pipes of the secondary energy-saving appliances, and the flue gas of the secondary economizer The pipe is arranged on the flue gas passage between the economizer and the cyclone dust collector, and the water flow pipe of the secondary economizer is arranged on the water flow passage between the deaerator and the deaerator pump. 3. The environmental protection and energy-saving control system for biomass boilers according to claim 1 or 2, characterized in that: it also includes a three-stage economizer, the flue gas pipes and water flow pipes of the three-stage energy-saving appliances, and the three-stage economizer The flue gas pipe is arranged on the flue gas passage between the dust collector and the induced draft fan; one end of the water flow pipe of the three-stage economizer is connected to the soft water tank through a circulation pump, and the other end is directly connected to the soft water tank. 4. The environmental protection and energy-saving control system for biomass boilers according to claim 3, characterized in that: the biomass boiler is provided with two air inlets, each air inlet is provided with a blower, and the air inlets are respectively arranged at the Substance Boiler Bottom and Middle.