How to choose the model of the gas pressure regulating box?

How to choose the model of the gas pressure regulating box?



1. Is the RTZ-21Q type or the RTZ-31Q type gas pressure regulating box selected?
My opinion is to use the RTZ-21Q type pressure regulating box, based on:
1.1 RTZ-21Q has better adaptability than RTZ-31Q when the pressure in the medium pressure pipe network is low.
RTZ-21Q surge tank inlet pressure range: 0.02 ~ 0.2 MPa
RTZ-31Q surge tank inlet pressure range: 0.05 ~ 0.4 MPa
When using liquefied gas or liquefied gas mixed air, the medium pressure pipe network pressure fluctuation range is 0.02 ~ 0.08 MPa; when using natural gas, the medium pressure pipe network pressure fluctuation range is 0.03 ~ 0.2 MPa; using RTZ-21Q can fully meet two The gas pressure fluctuation range, and the RTZ-21Q has better adaptability than the RTZ-31Q under low pressure conditions.
1.2 When the inlet pressure is low, the calculated flow rate of the RTZ-21Q is higher than that of the RTZ-31Q. The calculated flow rate of the pressure tank is the most unfavorable when the medium pressure pipe network is the lowest, that is, the flow rate of the pressure regulating tank when the inlet pressure of the pressure regulating tank is the lowest.
The RTZ-21Q is compared to the RTZ-31Q flow (air) list at different inlet pressures as follows:

Regulator caliber	Regulator inlet pressure (MPa)
0.05	0.07	0.1	0.2
A	B	A/B	A	B	A/B	A	B	A/B	A	B	A/B
25	15	6	2.5	20	10	2	42	20	2.1	60	25	2.4
40	20	10	2	25	twenty two	1.1	48	twenty four	2	65	80	0.8
50	30	12	2.5	45			52	25	2.1	82	100	0.8

Note:
1. A- stands for RTZ-21Q traffic; B- stands for RTZ-31Q traffic.
2. The pressure at the outlet of the regulator is 2.5 to 3.0 kPa.
For natural gas, the minimum inlet pressure of the surge tank (pressure tank design pressure) is 0.07 MPa. When the inlet pressure is between 0.05 and 0.1 MPa, the RTZ-21Q is twice the flow rate of the RTZ-31Q.
2. Defining the gas calculation tank
2.1 Gas calorific value and rated flow of double-eye stove

Gas type	Gas calorific value	Double eye stove rated flow	Remarks
Liquefied gas	25500 kcal/m3	0.25 m3 / h
natural gas	8500 kcal/m3	0.75m3 / h

2.2 Determine the gas passing the lowest calorific value per unit time

Gas type	Gas density (kg/Nm3)	T in (MPa)	Regulator flow and calorific value
RTZ-21/25Q	RTZ-21/40Q	RTZ-21/50Q
K	R	Z	K	R	Z	K	R	Z
Liquefied gas	2.38	0.05	15	11.1	28.3	20	14.8	37.7	30	22.2	56.6
natural gas	0.8	0.07	20	25.4	21.59	25	31.8	27.03	45	57.2	48.6

Note:
1, T-input regulator pressure design
2. K-air flow rate (m3/h); R-gas flow rate (m3/h); Z-corresponding gas flow rate R gas heat value (104 kcal).
3. The air density is calculated according to 1.29 kg/Nm3.
From this table you can conclude:
For liquefied gas-natural gas medium pressure pipe network, the pressure regulating box should be selected according to the conditions of natural gas. The selected pressure regulating box can meet the requirements of liquefied gas and natural gas.
3. It is clear that the calculated flow rate of the gas pressure regulating tank should be 1.2 times the calculated flow rate of the user gas.
4. The gas pressure regulating box selection table is based on the above 1 to 3, and the selection list of various types of gas medium pressure pipe network pressure regulating boxes is as follows:
4.1 LPG natural gas pipeline network system

Number of households	Simultaneous working coefficient	Calculate flow Q (m3 / h)	Pressure regulator model (rated flow)
1 to 80	1 to 0.35	0.75≤Q<21.2	RTZ-21/25Q (25.4)
1~104	1~0.34	0.75 ≤ Q < 26.5	RTZ-21/40Q (31.8)
1～205	1 to 0.31	0.75 ≤ Q < 47.7	RTZ-21/50Q (57.2)

Note:
1. Calculate the flow rate - the calculated flow rate for natural gas.

2. The rated flow rate of the gas pressure regulating tank is the flow rate of the pressure regulating tank when the inlet pressure of the natural gas is 0.07 MPa and the outlet pressure is 2.5 to 3 kPa.

Source: Hebei Zhenxing Gas Regulator Co., Ltd. Gas Regulator http://
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn

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