CN204786486U - Coal fired boiler flue gas processing system - Google Patents

Abstract

The utility model discloses a coal fired boiler flue gas processing system, coal fired boiler flue gas processing system connects between coal fired boiler and chimney. Coal fired boiler flue gas processing system includes air heater, desulfurizing tower, reaches gas cleaning waste heat heat exchanger, and air heater connects the flue of boiler afterbody, and air heater passes through smoke exhaust passage and connects the desulfurizing tower, and gas cleaning waste heat heat exchanger is installed between desulfurizing tower and chimney. Gas cleaning waste heat heat exchanger is arranged in the moisture of absorption of flue gas waste heat and condensation flue gas, can high -efficient clear away the dust in the flue gas and play devulcanization. Coal fired boiler flue gas processing system is with the effectual recycle of waste heat of boiler flue gas to can the condensation in flue gas moisture behind the desulfurizing tower, and overall smoke and dust in the flue gas almost can be taken away to the condensate water, reaches the effect of flue gas ultrapurification and dehumidification, the condensate water after handling can be used for the cooling tower to spray perhaps desulfurization water, has played energy -concerving and environment -protective effect.

Description

A coal-fired boiler flue gas treatment system

technical field

The utility model relates to the field of coal-fired flue gas treatment, in particular to a coal-fired boiler flue gas treatment system.

Background technique

Energy conservation and emission reduction is a major strategic issue related to the sustainable development of the economy and society. In September 2014, the National Development and Reform Commission, the Ministry of Environmental Protection and the National Energy Administration jointly issued the "Coal Power Energy Conservation and Emission Reduction Upgrading and Transformation Action Plan (2014-2020 2009)", which requires that the emission of newly built coal-fired units in the eastern region basically meet the pollutant emission limit of gas turbine units, that is, under the condition of a reference oxygen content of 6%, the emission concentrations of soot, SO ₂ , and NO _X are not higher than 10mg/m ³ and 35mg respectively /m ³ , 50mg/m ³ , the central and western regions are also required.

According to the forecast of the General Institute of Electric Power Planning and Design, by 2020, the installed capacity of thermal power in the country will reach 1.22 billion kilowatts, and the newly added installed capacity will be about 300 million kilowatts. Although coal-fired power generation is already the "cleanest" way to utilize coal resources in my country, its waste heat and waste gas emissions are still one of the main factors restricting environmental development due to its large base.

Utility model content

The utility model proposes a system for utilization of waste heat of coal-fired boiler flue gas, ultra-purified emission of flue gas and dehumidification of flue gas, which can effectively extract waste heat in flue gas and provide it to the corresponding heating system for reasonable use; The dust in the air is purified to the maximum extent to achieve comprehensive energy saving and environmental protection effects.

The utility model adopts the following technical solutions:

A coal-fired boiler flue gas treatment system, the coal-fired boiler flue gas treatment system is connected between the coal-fired boiler and the chimney, the coal-fired boiler flue gas treatment system includes an air preheater, a desulfurization tower, and flue gas purification waste heat The heat exchanger and the air preheater are connected to the flue at the tail of the boiler, the air preheater is connected to the desulfurization tower through the exhaust channel, and the waste heat heat exchanger for flue gas purification is installed between the desulfurization tower and the chimney;

The flue gas purification waste heat heat exchanger is used for absorbing waste heat of flue gas, condensing moisture in flue gas, and removing dust in flue gas.

Preferably, the flue gas purification waste heat heat exchanger is connected with a heat pump, and the circulating water pipe of the flue gas purification waste heat heat exchanger and the heat pump form a circulation pipeline.

Preferably, the heat pump is connected to the driving energy pipe network, the heat pump is driven by the driving energy, the output end of the heat pump is connected to the available heat source pipe network, the heat pump absorbs the low-level heat source from the flue gas purification waste heat heat exchanger, and outputs the high-level available heat source to the available heat source pipe network. Use a heat source.

Preferably, the flue gas purification waste heat heat exchanger is a fluoroplastic heat exchanger.

The beneficial technical effect obtained by adopting the above technical scheme is:

The coal-fired boiler flue gas treatment system effectively recycles the waste heat of the boiler flue gas, and can condense the moisture in the flue gas after the desulfurization tower, and the condensed water can almost take away all the flue dust in the flue gas, achieving the ultra-purification and dehumidification of the flue gas As a result, the treated condensed water can be used for cooling tower spray or desulfurization water, which plays a role in energy saving and environmental protection. The system can not only recover the waste heat of the flue gas, but also play the role of super-purifying and discharging the flue gas.

Description of drawings

Figure 1 is a schematic diagram of a coal-fired boiler flue gas treatment system.

In the figure: 1. Boiler; 2. Air preheater; 3. Desulfurization tower; 4. Flue gas purification waste heat heat exchanger; 5. Heat pump; 6. Chimney.

Detailed ways

The specific implementation of the utility model will be further described in conjunction with accompanying drawing 1. The schematic embodiment of the utility model and its description are used to explain the utility model, and do not constitute an improper limitation of the utility model.

A coal-fired boiler flue gas treatment system is connected between the coal-fired boiler and a chimney. The coal-fired boiler flue gas treatment system includes an air preheater, a desulfurization tower, and a waste heat exchanger for flue gas purification. The air preheater is connected to the flue at the tail of the boiler. The purification waste heat exchanger is installed between the desulfurization tower and the chimney. The flue gas purification waste heat heat exchanger is used to absorb the waste heat of the flue gas, condense the moisture in the flue gas, and remove the dust in the flue gas. The flue gas purification waste heat heat exchanger is connected with a heat pump, and the flue gas purification waste heat heat exchanger and the heat pump form a circulation pipeline. The heat pump absorbs low-level driving energy and outputs high-level available heat sources.

The coal-fired boiler flue gas treatment system includes a heat pump. The heat pump is a circulation device that absorbs heat from a low-temperature heat source and sends it to a high-temperature heat source. It uses a part of driving energy as compensation to transfer heat energy from a low-temperature heat source to a high-temperature heat source. A heat pump is essentially a heat raising device, which consumes a small part of the driving energy when it works, but can extract 4-7 times the driving energy from the environmental medium. Since the heat pump can convert low-temperature heat energy into high-temperature heat energy and improve the effective utilization rate of energy, it is an important way to recover low-temperature waste heat and utilize energy stored in the environmental medium. The driving energy is a high-grade heat source, which can be steam, high-temperature hot water, or oil, gas or electric energy.

As shown in Figure 1, the heat pump is connected to the driving energy pipe network. The heat pump is driven by the driving energy. The output end of the heat pump is connected to the available heat source pipe network. Heat source available.

The flue gas purification waste heat heat exchanger is a special fluoroplastic heat exchanger. Its unique acid corrosion resistance, temperature resistance and non-fouling performance make it the most economical solution for flue gas waste heat recovery in the prior art.

The flue gas discharged from the tail flue of the boiler 1 is cooled by the air preheater 2, then enters the desulfurization tower 3 for desulfurization through the flue, and then passes through the flue gas purification waste heat heat exchanger 4 for waste heat recovery, condenses the moisture in the flue gas, and cleans The flue gas is exhausted to atmosphere through chimney 6.

The circulating water in the flue gas purification waste heat heat exchanger 4 absorbs the heat in the flue gas and heats up, enters the heat pump 5 to cool down, and then enters the flue gas purification waste heat heat exchanger 4 again for circulation. After absorbing heat, the heat pump 5 provides available heat sources and other heating Medium heat exchange to realize energy recycling.

The flue gas purification waste heat heat exchanger can effectively recycle the waste heat of the boiler flue gas, and can condense the moisture in the flue gas after the desulfurization tower, and the condensed water can almost take away all the dust in the flue gas, so as to achieve the ultra-purification and dehumidification of the flue gas As a result, the treated condensed water can be used for cooling tower spray or desulfurization water, which plays a role in energy saving and environmental protection.

Of course, the above descriptions are only preferred embodiments of the present invention, and the present invention is not limited to the above-mentioned embodiments. It should be noted that any person skilled in the art can make all the Equivalent substitutions and obvious deformation forms all fall within the essential scope of this specification and should be protected by the utility model.

Claims (4)

1. a fire coal boiler fume treatment system, fire coal boiler fume treatment system is connected between coal-burning boiler and chimney, it is characterized in that, described fire coal boiler fume treatment system comprises air preheater, desulfurizing tower and gas cleaning afterheat heat exchanger, air preheater connects the flue of boiler tail, air preheater connects desulfurizing tower by discharge flue, and gas cleaning afterheat heat exchanger is arranged between desulfurizing tower and chimney;

The dust that described gas cleaning afterheat heat exchanger is used for the moisture in the absorption of fume afterheat, condensation flue gas and removes in flue gas.

2. a kind of fire coal boiler fume treatment system according to claim 1, is characterized in that, described gas cleaning afterheat heat exchanger is connected with heat pump, and the circulating water pipe of gas cleaning afterheat heat exchanger and heat pump form circulation line.

3. a kind of fire coal boiler fume treatment system according to claim 2, it is characterized in that, described heat pump connects drive energy pipe network, heat pump is driven by drive energy, heat pump output connects can utilize thermal source pipe network, heat pump absorbs low level heat energy from gas cleaning afterheat heat exchanger, exports a high position can utilize thermal source to utilizing thermal source pipe network.

4. a kind of fire coal boiler fume treatment system according to claim 1, is characterized in that, described gas cleaning afterheat heat exchanger is teflon heat exchanger.