CN116159430A - Grid measuring device and method with adjustable ammonia spraying amount - Google Patents

Abstract

The invention relates to the technical field of boiler denitration, and provides a gridding measuring device with adjustable ammonia spraying amount, which comprises: an ammonia injection grid dividing the inlet of the denitration reactor into a plurality of ammonia injection grid areas; the ammonia supply pipes are connected with the ammonia spraying grid, and each ammonia supply pipe is provided with a manual flow regulating valve; the outlet section of the denitration reactor is divided into a plurality of measuring areas by the grid sampling tube, and the measuring areas are arranged in one-to-one correspondence with the plurality of ammonia injection grid areas; a hand-held meter for measuring NH3 concentration and NOx concentration in the measurement region. The method comprises the following steps: measuring NH3 concentration and NOx concentration in a certain measurement area of the gridding sampling tube by using a handheld instrument; according to the measured NH3 concentration and NOx concentration, adjusting the opening of a manual flow regulating valve in a corresponding ammonia injection grid area; and (5) performing cyclic operation on other measurement areas and corresponding ammonia injection grid areas.

Description

Grid measuring device and method with adjustable ammonia spraying amount

Technical Field

The invention relates to the technical field of boiler denitration, in particular to a gridding measuring device and method with adjustable ammonia spraying amount.

Background

The boiler is generally internally provided with a denitration reactor, the internal flow field of the denitration reactor is non-uniform, the conventional denitration adopts a boundary condition of a uniform inlet, and NOx and NH3 in flue gas are difficult to uniformly mix by adopting an average ammonia spraying strategy.

The conventional denitration CEMS measurement adopts single-point extraction measurement, has single measurement value, is not representative, cannot accurately regulate the ammonia injection amount, and has the following defects: 1. on one hand, the excessive local ammonia concentration is easy to cause excessive ammonia escape, and excessive ammonia spraying not only causes ammonia waste, but also easily causes the problems of secondary pollution, blockage, catalyst deactivation and the like; on the other hand, the partial ammonia concentration is too low, and the incomplete reaction is caused by insufficient ammonia injection, so that the NOx emission exceeds the standard. 2. The whole working process is automatically controlled, and the cost is high.

Disclosure of Invention

According to a first aspect of the present invention, an object of the present invention is to provide a gridding measurement device and method with an adjustable ammonia injection amount, so that the ammonia injection amount can be controlled more accurately.

In order to achieve the above object, the present invention provides a gridding measuring device with adjustable ammonia spraying amount, which is used in cooperation with a denitration reactor, and comprises:

an ammonia injection grid installed before the denitration reactor, the ammonia injection grid dividing an inlet of the denitration reactor into a plurality of ammonia injection grid areas;

the ammonia supply pipes are connected with the ammonia spraying grids, and each ammonia supply pipe is provided with a manual flow regulating valve;

the grid sampling tube is arranged at the outlet of the denitration reactor, divides the outlet section of the denitration reactor into a plurality of measurement areas, and the measurement areas are arranged in one-to-one correspondence with the plurality of ammonia injection grid areas;

a hand-held meter for measuring NH3 concentration and NOx concentration within the measurement region.

Further, each ammonia supply pipe is provided with an orifice plate flowmeter.

Further, the manual flow regulating valve is a butt clamp type butterfly valve.

Further, the number of the ammonia injection grid areas is 20.

According to a second aspect of the present invention, there is provided a gridding measurement method with an adjustable ammonia injection amount, comprising the steps of:

measuring the NH3 concentration and the NOx concentration in a certain measuring area by the handheld instrument;

according to the measured NH3 concentration and NOx concentration, adjusting the opening of the manual flow regulating valve in the corresponding ammonia injection grid area until the handheld instrument displays that the NH3 concentration and the NOx concentration are lower than the design values;

and circularly carrying out the operation on the other measuring areas and the corresponding ammonia injection grid areas.

The invention has the beneficial effects that: according to the gridding measuring device and method with the adjustable ammonia spraying amount, the NH3 concentration and the NOx concentration in the measuring area are measured by using the handheld instrument, the ammonia spraying amount in the corresponding ammonia spraying grid area is adjusted according to the measured data, the balanced proportion of ammonia nitrogen is realized as much as possible, and the ammonia escape is controlled on the premise of meeting the NOx emission standard, so that the ammonia spraying amount is controlled more accurately. And the whole working process does not use automatic control equipment, so the cost is lower.

Drawings

FIG. 1 is a schematic of the workflow of the present invention.

Detailed Description

The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.

In the present application, unless explicitly specified and limited otherwise, the terms "coupled," "affixed" and "fixedly attached" are to be construed broadly, and may be, for example, fixedly attached, detachably attached, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present application, it should be understood that the terms "longitudinal," "transverse," "horizontal," "top," "bottom," "upper," "lower," "inner" and "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "plurality" is two or more unless specifically defined otherwise.

As shown in fig. 1, according to a first aspect of the present invention, there is provided a gridding measurement apparatus with an adjustable ammonia injection amount, which is used in cooperation with a denitration reactor, and includes an ammonia injection grid, an ammonia supply pipe, a gridding sampling pipe, and a hand-held instrument.

The ammonia injection grid is arranged before the denitration reactor, and divides the inlet of the denitration reactor into a plurality of ammonia injection grid areas.

The ammonia supply pipes are provided with a plurality of ammonia supply pipes, are connected with the ammonia spraying grids and are arranged in one-to-one correspondence with the ammonia spraying grid areas. Each ammonia supply pipe is provided with a manual flow regulating valve which is used for controlling the ammonia spraying amount of the ammonia supply pipe.

The grid sampling tube is arranged at the outlet of the denitration reactor, the outlet of the denitration reactor is divided into a plurality of measuring areas by the grid sampling tube, and the measuring areas are arranged in one-to-one correspondence with the ammonia spraying grid areas.

The hand-held meter is used to measure NH3 concentration and NOx concentration in the measurement area.

The device can be stably put into operation after being debugged.

The specific debugging process is as follows: the staff measures NH3 concentration and NOx concentration in a certain measuring area by using a handheld instrument, and adjusts the opening of a manual flow regulating valve in a corresponding ammonia spraying grid area according to measured data, so that the ammonia spraying amount of an ammonia supply pipe is changed, the balanced proportioning of ammonia nitrogen is realized as much as possible, the ammonia is controlled to escape on the premise that the NH3 concentration and the NOx concentration measured by the handheld instrument are lower than a design value (namely, the emission requirement of an environmental protection agency is met), and the ammonia spraying amount is controlled to be more accurately controlled.

And then sequentially debugging the NH3 concentration and the NOx concentration in other measuring areas.

The whole working process of the device does not use automatic control equipment, and most of the devices are manual control equipment, so the cost is lower.

The ammonia injection and grid measurement are carried out on the denitration reactor in a zoned mode in the boiler operation, so that the total ammonia injection amount is controlled more stably, the ammonia injection amount is reduced, the fluctuation range of the NOx concentration is obviously reduced, and the NOx concentration at two sides of a flue outlet of the denitration reactor basically represents the average value of the NOx concentration of the whole section of the flue.

In one embodiment, each ammonia supply pipe is provided with an orifice plate flowmeter for measuring the ammonia spraying amount of the ammonia supply pipe in real time, so that the ammonia supply pipe is convenient for workers to accurately master, and the follow-up workers can conveniently adjust the opening of the manual flow regulating valve.

In one embodiment, the manual flow regulator valve is a butterfly valve.

In one embodiment, the number of ammonia injection grid areas is 20.

According to a second aspect of the present invention, there is provided a method for measuring ammonia injection amount adjustable and meshing, comprising the steps of:

s10, a worker measures the NH3 concentration and the NOx concentration in a certain measurement area through a handheld instrument.

S20, the worker adjusts the opening of the manual flow regulating valve in the corresponding ammonia injection grid area according to the measured NH3 concentration and NOx concentration, so that the ammonia injection amount of the ammonia supply pipe is changed until the handheld instrument displays that the NH3 concentration and the NOx concentration are both close to 0.

S30, circularly performing the operation on other measuring areas and corresponding ammonia injection grid areas,

while the fundamental and principal features of the invention and advantages of the invention have been shown and described, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims (5)

1. Grid measuring device with adjustable ammonia spraying amount is used with denitration reactor cooperation, its characterized in that: comprising the following steps:

an ammonia injection grid installed before the denitration reactor, the ammonia injection grid dividing an inlet of the denitration reactor into a plurality of ammonia injection grid areas;

the ammonia supply pipes are connected with the ammonia spraying grids, and each ammonia supply pipe is provided with a manual flow regulating valve;

the grid sampling tube is arranged at the outlet of the denitration reactor, divides the outlet section of the denitration reactor into a plurality of measurement areas, and the measurement areas are arranged in one-to-one correspondence with the plurality of ammonia injection grid areas;

a hand-held meter for measuring NH3 concentration and NOx concentration within the measurement region.

2. The ammonia injection amount adjustable gridding measuring device according to claim 1, wherein: and each ammonia supply pipe is provided with an orifice plate flowmeter.

3. The ammonia injection amount adjustable gridding measuring device according to claim 1, wherein: the manual flow regulating valve is a butt clamp type butterfly valve.

4. The ammonia injection amount adjustable gridding measuring device according to claim 1, wherein: the number of the ammonia injection grid areas is 20.

5. An ammonia injection amount adjustable meshing measurement method, applied to the ammonia injection amount adjustable meshing measurement device in any one of claims 1-4, characterized in that: the method comprises the following steps:

measuring the NH3 concentration and the NOx concentration in a certain measuring area by the handheld instrument;

according to the measured NH3 concentration and NOx concentration, adjusting the opening of the manual flow regulating valve in the corresponding ammonia injection grid area until the handheld instrument displays that the NH3 concentration and the NOx concentration are lower than the design values;

and circularly carrying out the operation on the other measuring areas and the corresponding ammonia injection grid areas.

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