CN110878715A - Reducing NO during low power operation of gas turbinexMethod of discharging - Google Patents

Abstract

The present disclosure discloses a method for reducing NO_XAn exhaust gas turbine engine comprising: the device comprises a compressor, a turbine, a generator, a cooling device and a plasma denitration device. The present disclosure also discloses a method for reducing NO during low power operation of a gas turbine_XA method of venting. According to the gas turbine, the cooling device is arranged at the gas inlet of the gas turbine, and the plasma denitration device is arranged at the gas outlet, so that NO can be effectively reduced_XAnd (4) discharging.

Description

Reducing NO during low power operation of gas turbineXMethod of discharging

Technical Field

The disclosure belongs to the field of comprehensive optimization control of electrical engineering, and particularly relates to a method for reducing NO during low-power operation of a gas turbine_XA method of venting.

Background

With the further optimized configuration of electric power resources, the extra-high voltage direct current can continuously transport the Sichuan (quantitative) quantitative energy to the load concentration region, thereby meeting the requirements of social production and realizing the low-carbon Sichuan (quantitative) quantitative power supply. However, the scale of the direct current concentrated fed into the receiving-end power grid is greatly increased, and new challenges are brought to the safe and stable operation of the receiving-end power grid. With the centralized feeding of large-scale direct current, the voltage regulation and control capability of the power grid is obviously influenced, and the influence is particularly prominent under the condition of a dynamic phase change failure process and a low-valley condition of a direct current system. According to the direct current design principle, direct current does not provide dynamic reactive power for the system. The extra-high voltage direct current transmission can transmit active power on a large scale, so that the receiving end power grid is insufficient in reactive power, and a large amount of reactive power needs to be absorbed from the system in the dynamic process.

The large-scale gas turbine is used as a generator set with rapid start and stop and convenient adjustment, is relatively suitable for the application of dynamic reactive power support of a receiving-end power grid, does not excessively increase the basic load requirement of the receiving-end power grid, and is generally called as a gas turbine low-power phase modulation operation technology. However, during low power phase modulation operation of gas turbines, increased NOx emissions may occur. In recent years, NOx emissions have failed to meet the standards of new environmental regulations. Therefore, it is necessary to add a certain technical means to the air intake and exhaust links of the gas turbine to achieve the effect of reducing the comprehensive emission.

Disclosure of Invention

To address the problem of increased NOx emissions during low power operation in existing gas turbines, the present disclosureIt is an object to provide a method for reducing NO during low power operation of a gas turbine_XThe method of discharging, on one hand, set up the refrigerating plant in the air intake, in order to reduce the production of NOx by lowering the intake temperature; and on the other hand, a plasma denitration device is arranged at the discharge port to reduce the discharge amount of NOx.

The purpose of the present disclosure is realized by the following technical scheme:

can reduce NO_XAn exhaust gas turbine engine comprising: the system comprises a gas compressor, a turbine, a generator, a cooling device and a plasma denitration device; wherein the content of the first and second substances,

the compressor, the turbine and the generator are arranged on the same main shaft;

the cooling device is arranged in front of the air compressor and used for cooling and refrigerating air to be fed into the air compressor; the plasma denitration device is arranged behind the turbine, and NO contained in the flue gas is removed through plasma generated by high-voltage discharge_X。

The refrigerating capacity of the cooling device is matched with the air inlet amount of the air compressor by 1: 1.

Preferably, one end of the generator is provided with a high-voltage standby transformer for supplying power to the cooling device and the plasma denitration device; the high-voltage standby transformer is connected with the cooling device and the plasma denitration device through a first switch S1 and a second switch S2 respectively.

The present disclosure also provides a method for reducing NO during low power operation of a gas turbine_XA method of venting comprising the steps of:

s100: cooling air to be fed into the compressor;

s200: plasma treatment of NO contained in flue gas_XThe molecules are oxidized and degraded.

Preferably, the NO is treated by plasma_XThe molecules are oxidized and degraded in any mode as follows: electron beam irradiation and gas corona discharge.

Drawings

FIG. 1 is a schematic representation of a method of reducing NO as disclosed in the present disclosure_XSchematic of the exhaust gas turbine.

FIG. 2 is a schematic diagram of the components of a gas turbine inlet air cooled by the electric refrigeration technique shown in this disclosure.

Detailed Description

The technical solution of the present disclosure is described in detail below with reference to the accompanying drawings and examples.

Referring to FIG. 1, a method for reducing NO_XAn exhaust gas turbine engine comprising: the system comprises a gas compressor, a turbine, a generator, a cooling device and a plasma denitration device; the compressor, the turbine and the generator are arranged on the same main shaft; the cooling device is arranged in front of the air compressor and used for cooling and refrigerating air to be fed into the air compressor; the plasma denitration device is arranged behind the turbine, and NO contained in the flue gas is removed through plasma generated by high-voltage discharge_X。

The embodiment refrigerates and cools the air, thereby reducing NO_XAt the same time, the NO contained in the flue gas is treated by the plasma denitration technology at the exhaust port_XThe embodiment can effectively reduce NO generated in the combustion process of the gas turbine by carrying out oxidation and degradation and combining two emission reduction modes_XThe amount of discharge of (c).

In another embodiment, one end of the generator is provided with a high-voltage standby transformer for supplying power to the cooling device and the plasma denitration device; the high-voltage standby transformer is connected with the cooling device and the plasma denitration device through a first switch S1 and a second switch S2 respectively.

In this embodiment, the high-voltage backup transformer is connected to the cooler through the first switch S1, and the high-voltage backup transformer is connected to the plasma denitration device through the second switch S2.

In another embodiment, the refrigerating capacity of the cooler is matched with the air inlet quantity 1:1 of the compressor.

In another embodiment, the intake air of the gas turbine is cooled by adopting an electric refrigeration technology, the components of the intake air are shown in figure 2, firstly, a tubular heat exchanger is arranged at an air inlet channel of a gas compressor of the gas turbine, the air flow and the air intake of the gas compressor are the same, and the matching of 1:1 is ensured. The variable frequency power supply is supplied with power by a power supply at the generator end of the gas turbine generator, the refrigerating machine is driven to generate cold water with the temperature of less than 5 ℃, and the cold water is injected into the tubular heat exchanger, so that the effect of reducing the temperature of inlet air is achieved. .

In another embodiment, the present disclosure also provides a method for reducing NO during low power operation of a gas turbine_XA method of venting comprising the steps of:

s100: cooling air to be fed into the compressor;

s200: plasma treatment of NO contained in flue gas_XThe molecules are oxidized and degraded.

In the specific embodiment of the step S100, the cooling device is added to the air inlet of the compressor to reduce the temperature of the inlet air, so as to reduce the combustion temperature under the same output condition, which is helpful for reducing NO_XAnd (4) discharging.

In the embodiment of step S200, a large amount of energy-carrying electrons are generated to bombard NO by discharging under normal temperature and normal pressure under the action of an external electric field_XThe molecules are ionized, dissociated and excited, and then are converted into simple small molecule safe substances.

In another embodiment, in step S200, the NO is plasma-paired_XThe molecules are oxidized and degraded in any mode as follows: electron beam irradiation and gas corona discharge.

In this embodiment, the electron beam irradiation is performed by irradiating the flue gas with an electron beam generated by an electron accelerator, so that molecules such as water vapor and oxygen are excited to generate active substances such as high-energy radicals with strong oxidizing property, and NO in the flue gas is oxidized into NO₂Reacting with water vapor to generate vaporous nitric acid, then introducing NH₃Ammonium nitrate is generated through reaction, so that the aim of denitration is fulfilled; the gas corona discharge is to make molecules such as H in the flue gas by high-energy electrons generated in the corona discharge process₂O、O₂Etc. are activated, cleaved or ionized, thereby generating strongly oxidizing radicals O, OH, H₂O₂And the like, and further performing plasma catalytic oxidation on the NO to generate NO₂Or the corresponding acid.

In summary, the present disclosure provides a cooling device at the inlet of a gas turbineThe exhaust port is provided with the plasma denitration device, so that NO can be effectively reduced_XAnd (4) discharging.

Claims (4)

1. Can reduce NO_XAn exhaust gas turbine engine comprising: the system comprises a gas compressor, a turbine, a generator, a cooling device and a plasma denitration device; wherein the content of the first and second substances,

the compressor, the turbine and the generator are arranged on the same main shaft;

the cooling device is arranged in front of the air compressor and used for cooling and refrigerating air to be fed into the air compressor; the plasma denitration device is arranged on the turbine and used for removing NO contained in the flue gas by plasma generated by high-voltage discharge_X。

The refrigerating capacity of the cooling device is matched with the air inlet amount of the air compressor by 1: 1.

2. The gas turbine of claim 1, wherein one end of the generator is provided with a high voltage backup transformer for supplying power to the cooling device and the plasma denitration device; the high-voltage standby transformer is respectively connected with the cooling device and the plasma denitration device through a first switch S1 and a second open pipe S2.

3. Reducing NO during low power operation of gas turbine_XA method of venting comprising the steps of:

s100: cooling air to be fed into the compressor;

s200: plasma treatment of NO contained in flue gas_XThe molecules are oxidized and degraded.

4. The method of claim 3, wherein the NO is plasma-paired_XThe molecules are oxidized and degraded in any mode as follows: electron beam irradiation and gas corona discharge.

Images