Automatic adjusting device for denitration ammonia injection gate

Abstract

The present application belongs to the technical field of flue gas purification, and discloses a kind of automatic adjusting device of denitration ammonia injection gate, including wind pressure sensing element, pressure regulating opening device, temperature feedforward regulating device on ammonia injection head, according to mechanical mode automatic adjusting ammonia injection gate opening, realize according to flue gas volume automatic adjusting the ammonia injection amount of each ammonia injection gate;Device realizes the automatic control and adjustment of on-site equipment, both meets the national environmental protection to thermal power plant NO x The emission requirement, also reduces the consumption of ammonia injection of power plant, for sulfur-containing coal, reduces the generation of sulfuric acid hydrogen ammonium, avoids the plugging and hardening problem of air preheater, dust collector and tail flue, does not increase flue resistance, does not increase the specific consumption of induced draft fan, and does not cause the problem of unit load limitation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of flue gas purification, in particular to a denitration ammonia injection gate automatic adjusting device. BACKGROUND

[0002] With the strengthening of the state's monitoring of atmospheric pollutant emissions, the denitration system has become an important equipment for large thermal power generating units to achieve ultra-low emission. In application, some problems are highlighted, such as too high ammonia escape rate, too large ammonia consumption and serious pollution of fly ash quality treatment. The ultra-low emission transformation of coal-fired power plants (NOx emission less than 50 mg / m3) has been basically completed, and the new standard requires NOx emission to be less than 30 mg / m3, which brings great control difficulty to many power plants. The environmental protection department's supervision requirements for thermal power plants are also getting higher and higher, which stipulates that the flue gas denitration facilities of coal-fired units shall be included in the operation assessment management. At present, in the AGC adjustment of coal-fired units, the NOx concentration in the flue gas fluctuates greatly due to the restriction of load and coal type, the stratification phenomenon in the flue gas is obvious, and the response of DCS ammonia injection adjustment lags behind, so it is necessary to control the ammonia injection more accurately according to the stratification of flue gas. SUMMARY

[0003] The present application provides a kind of denitration ammonia injection gate automatic adjusting device, including in ammonia injection head add wind pressure sensing element, add pressure regulating opening device, temperature feedforward regulation device, according to mechanical mode automatic regulation ammonia injection gate opening, realize according to the flue gas volume automatic regulation the ammonia injection amount of each ammonia injection gate;Device realizes the automatic control and regulation of local equipment, both satisfies the state environmental protection to thermal power plant NO x Emission requirements, also reduce the consumption of ammonia injection of power plant, for sulfur coal, reduce the generation of sulfuric acid hydrogen ammonia, avoid the problem of air preheater, dust collector and tail flue block and hardening, do not increase the flue resistance, do not increase the specific consumption of induced draft fan, therefore, the unit load is limited.

[0004] The technical scheme of the present application is as follows: a kind of denitration ammonia injection gate automatic adjusting device, comprising: top end block and ammonia injection channel, the ammonia injection channel is equipped with branch channel, branch channel is equipped with multiple openings near end position, branch channel is sleeved with wind pressure spring, one end of wind pressure spring is fixed with top end block, the other end is fixed with ammonia injection channel;The inside of top end block is equipped with through passage, and the middle part of through passage is equipped with containing space, and the containing space is larger than the opening;A part of branch channel is arranged in top end block;When wind pressure spring is in maximum compression state, opening is in containing space, when wind pressure spring is in maximum straightening state, opening is blocked by top end block, there is sealing ring in containing space and is sleeved on branch channel.

[0005] Further, the top end block is in the shape of an umbrella cap, a cone or a circular truncated cone.

[0006] Further, the opening has more than one, and the opening is 10mm long and 1mm wide.

[0007] Further, the ammonia spraying channel is provided with a plurality of temperature deformation devices, and the temperature deformation devices are connected with the top block through tension springs.

[0008] Further, the temperature deformation device has two.

[0009] Further, the temperature deformation device can be deformed within the range of 0-200 degrees Celsius and 0-3mm.

[0010] Further, the ammonia spraying channel is provided with a compressed air pipe, and the outlet of the compressed air pipe is located below the top block.

[0011] The beneficial effects of the present application are:

[0012] The wind pressure sensing element and the pressure regulating opening device are installed on the ammonia spraying head, and the temperature feedforward regulating device is installed, so that the ammonia spraying door opening is automatically adjusted in a mechanical manner, and the ammonia spraying amount of each ammonia spraying door is automatically adjusted according to the flue gas amount; the device realizes automatic control and adjustment of the on-site equipment, meets the emission requirements of the state environmental protection on NO x of the thermal power plant, reduces the consumption of ammonia spraying of the power plant, reduces the generation of sulfuric acid hydrogen ammonia for the sulfur-containing coal, avoids the problems of blockage and hardening of the air preheater, the dust collector and the tail flue, does not increase the flue resistance, does not increase the unit consumption of the induced draft fan, and does not cause the problem of limited unit load. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the device of the present application.

[0014] Figure 2 It is a schematic diagram of the installation position of the device of the present application.

[0015] Figure 3 It is an enlarged schematic diagram of the setting position structure of the device of the present application.

[0016] Legend: 1 - opening; 2 - passage; 3 - wind pressure spring; 4 - temperature deformation device; 5 - compressed air pipe; 6 - ammonia spraying channel; 7 - top block; 8 - containing space; 9 - sealing ring; 10 - branch channel; 11 - tension spring; 12 - flue; A - setting position of the device of the present application. DETAILED DESCRIPTION

[0017] The application discloses a kind of automatic adjusting device of denitration ammonia injection door, comprising: top end block 7 and ammonia injection passage 6, the ammonia injection passage 6 is equipped with branch passage 10, branch passage 10 is equipped with multiple openings 1 near end position, branch passage 10 is sleeved with wind pressure spring 3, one end of wind pressure spring 3 is fixed with top end block 7, the other end is fixed with ammonia injection passage 6;The inside of top end block 7 is equipped with through passage 2, and the middle part of through passage 2 is equipped with accommodating space 8, and accommodating space 8 is larger than opening 1;A part of branch passage 10 is arranged in top end block 7;When wind pressure spring 3 is in maximum compression state, opening 1 is in accommodating space 8, when wind pressure spring 3 is in maximum straightening state, opening 1 is blocked by top end block 7, and there is sealing ring 9 in accommodating space 8, which is sleeved on branch passage 10.

[0018] Further, the top end block 7 is in the shape of an umbrella cap, a cone or a circular truncated cone.

[0019] Further, the opening 1 has more than one, and the length of the opening is 10 mm and the width is 1 mm.

[0020] Further, the ammonia injection passage 6 is equipped with multiple temperature deformation devices 4, and the temperature deformation devices 4 are connected to the top end block 7 through a tension spring 11.

[0021] Further, the temperature deformation device 4 has two.

[0022] Further, the temperature deformation device 4 can deform within the range of 0-200 degrees Celsius and 0-3 mm.

[0023] Further, the ammonia injection passage 6 is equipped with a compressed air pipe 5, and the outlet of the compressed air pipe 5 is located below the top end block 7.

[0024] The application discloses an automatic adjusting device of a denitration ammonia injection door, which comprises a wind pressure sensing element and a pressure regulating opening device installed on an ammonia injection head, and a temperature feedforward adjusting device.

[0025] The denitration system has a centralized control system realized by DCS configuration control.

[0026] The application discloses an automatic adjusting device for a denitration ammonia injection door, which is a mechanical structure and internally provided with a back-blowing pipeline.

[0027] The wind pressure sensing element is in the shape of an umbrella cap structure top block 7, and pressure is formed on the umbrella cap according to the dynamic pressure of the flue gas flowing through the section. The umbrella cap is internally provided with a deformation spring and a sealing ring 9. Different flue gas flow rates correspond to different dynamic pressures, different sliding positions of the umbrella cap, different areas of the narrow ammonia injection slit covered, and different ammonia injection amounts, so that the ammonia injection is mechanically adjusted.

[0028] The pressure regulating opening device is provided with a corrosion-resistant smooth stainless steel pipe seat on the ammonia injection telescopic pipe head. A long narrow slit with a width of 1 mm and a length of 10 mm is cut on the pipe head. The ammonia injection telescopic pipe head is matched with the sliding inner wall of the umbrella cap and connected to the ammonia injection vertical pipe. Under normal flue gas flow conditions, the umbrella cap makes the sliding sleeve in a full-closed state by spring force. When the flue gas flow rate reaches the maximum, the maximum position calculated under the maximum design condition makes the narrow slit in a fully-opened state, so that the automatic pressure regulation is realized.

[0029] The temperature feedforward regulating device is provided with a temperature deformation sheet on the introduction pipe of the ammonia injection head vertical pipe. The deformation amount of the temperature deformation sheet in the range from room temperature to 200 DEG C is designed to be 3 mm. The temperature deformation sheet is introduced into the upper part of the umbrella cap by a tension spring 11 and fixed, so that the flue gas regulation is feedforward regulated. When the temperature of the flue gas flowing through the ammonia injection door increases, the temperature deformation sheet is upwardly tilted, the feedforward action widens the ammonia injection narrow slit area, and the temperature regulating range is increased by 20% of the opening amount in the dynamic pressure regulating range.

[0030] The compressed air pipe 5 is introduced into the ammonia injection amount regulating umbrella cap and connected to the inner side of the umbrella cap cover. The compressed air pipe 5 is regularly opened to perform blowing maintenance and remove flue gas attachments.

[0031] It should be noted that, in the present document, the terms such as first and second, etc., are merely used to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or device.

Claims

1. An automatic adjustment device for ammonia spray gate in a denitrification process, characterized in that, include: The device comprises a top block and an ammonia injection channel. The ammonia injection channel has branch channels with multiple openings near their ends. A wind pressure spring is fitted onto each branch channel, with one end fixed to the top block and the other end fixed to the ammonia injection channel. The top block has a through passage with a accommodating space in the middle, larger than the openings. A portion of the branch channels is located within the top block. When the wind pressure spring is in its maximum compressed state, the openings are within the accommodating space; when the wind pressure spring is in its maximum extended state, the openings are blocked by the top block. A sealing ring is fitted onto the branch channel within the accommodating space. The top block is umbrella-shaped, conical, or frustum-shaped. The ammonia injection channel has multiple temperature deformation devices connected to the top block via tension springs. These devices can deform within a range of 0-200 degrees Celsius and 0-3 mm. A compressed air pipe is located within the ammonia injection channel, with its outlet located below the top block.

2. The automatic adjustment device for ammonia spray gate in denitrification as described in claim 1, characterized in that, There is one or more openings, each 10mm long and 1mm wide.

3. The automatic adjustment device for ammonia spray gate in denitrification as described in claim 1, characterized in that, There are two temperature deformation devices.

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