Integrated medium temperature, medium pressure and sub high pressure temperature and pressure reducing device

WY series of temperature and pressure reducing device is a temperature and pressure reducing device designed by our company with many years of design and manufacturing experience, absorbing foreign advanced product structure and technical optimization.

Integrated medium temperature, medium pressure and sub high pressure temperature and pressure reducing device (wy01, wy02, wy05 / 06, wy09 / 10 series)

1. Structural characteristics

WY series of temperature and pressure reducing device is a temperature and pressure reducing device designed by our company with many years of design and manufacturing experience, absorbing foreign advanced product structure and technical optimization.

The desuperheating and pressure reducing device is composed of desuperheating and pressure reducing valve, throttle orifice, water supply regulating valve, safety valve, throttle valve, stop valve, check valve, steam pipe, water supply pipe, flange, fastener, etc. its main features are as follows:

1. With the structure of temperature and pressure reducing valve, the steam temperature and pressure reduction are carried out in the same valve, which greatly shortens the length of the whole unit, reduces the occupied area and reduces the project investment.

2. It adopts the structure of straight stroke double seat cage type temperature and pressure reducing valve. The valve is equipped with throttle net cover to enhance the atomization effect of desuperheating water, protect the valve seat and valve body, extend the service life of the valve, and reduce the noise of the device. The double seat valve has the advantages of small imbalance force, wide adjustment range and stable operation, so it will never be stuck. The sealing surface of the sub high pressure desuperheating and reducing valve is overlaid with cobalt based ercrmn-c-15, which is resistant to high temperature and scour; the valve seat and disc are single matched with adhesive wear, which has good sealing performance and overcomes the defect of large leakage of the double seat valve, and the applicable temperature is 510 ℃.

3. A unique nozzle is set in the desuperheating and reducing valve. The desuperheating water passes through the longer water chamber set in the valve core, making full use of the higher temperature of the primary steam to fully preheat. Part of the desuperheating water has been basically atomized before the spray of the annular nozzle, and the non atomized desuperheating water drops are further collided and atomized through the throttling hole cover at about 400 ℃, so the atomization effect is excellent.

4. Another important index of desuperheating water atomization is that the minimum steam flow rate at the spray point is ≥ 8m / s, while the steam flow rate between the valve disc and the valve seat in the desuperheating and reducing valve (i.e. the spray point of desuperheating water) is basically greater than 180m / s, which is equivalent to the flow rate required by the venturi desuperheater, and the atomization effect is excellent.

5. When the load of the desuperheater and pressure reducer changes greatly (10-110% q), especially when the load is small, the desuperheating water is preheated and atomized on the premise of making full use of the thermal energy and kinetic energy of the primary steam parameters, which makes up for the decrease of the desuperheating water flow speed and ensures that the desuperheating water can be fully and rapidly atomized in the atomizing section.

6. Noise reduction. On the one hand, the throttle cover and the throttle plate behind the temperature and pressure reducing valve play the role of pressure reducing atomization, and the main role is to reduce the noise in the system. The main principle is its small hole silencing.

7. Flow characteristics of temperature and pressure reducing valve: linear, leakage level: level III.

8. The temperature feed water regulating system adopts direct stroke single seat regulating valve (or V-type regulating valve) + throttling device, which not only reduces the leakage of the valve, but also can reasonably distribute the pressure difference on the feed water system; the same caliber, different flow coefficient CV values can be selected, which greatly improves the sensitivity and accuracy of the temperature regulating system.

9. Electric temperature and pressure reducing valve and electric water supply regulating valve are equipped with direct stroke electric actuator, which eliminates the traditional lever hinge mechanism, reduces the empty stroke link, and further improves the sensitivity and accuracy of the regulating system.

2. Model selection description of medium temperature and medium pressure desuperheating and reducing device (Table 1)

In the selection table of temperature and pressure reducing device, for the commonly used new steam parameters P1 and T1 of medium and low pressure boilers to the outlet steam parameters P2 = 1.4 ～ 0.1MPa, T2 = 400 ～ 130 ℃, and the flow Q = 2 ～ 120t / h, the series specification and code of the device required by the corresponding parameters are given one by one.

Note: ① the parameters listed in Table 1 are conventional parameters. If the corresponding series specification code cannot be found in the table for special parameters, contact the technical department of the company;

② when preparing this table, the parameters of desuperheating water supply are calculated with pressure Pb = 0.6p1 + 1.0MPa and temperature TB = 104 ℃.

3. Scope of supply

The scope of supply of temperature and pressure reducing device is within the mark, mainly including:

(1) pressure reducing system: temperature and pressure reducing valve, throttle orifice, etc;

(2) desuperheating system: feed water regulating valve, throttle valve, etc;

(3) safety system: safety valve, check valve, etc;

(4) pipeline system: steam pipe, transition pipe, desuperheating pipe, etc;

(5) supporting accessories: stop valve, bimetal thermometer and connecting pipe, pressure gauge and three-way valve, bend, joint, flange, gasket, bolt, nut, washer, etc.

4. Type selection of medium temperature, medium pressure, temperature and pressure reducing device

Table 1

Flow (t/h)	Secondary steam parameters			Primary steam parametersP1(MPa)、T1（℃）
	PressureP2 MPa	TemperatureT2 ℃		P1			T1	P1		T1		P1		T1		P1			T1	P1	T1		P1		T1
				1.3			300	1.3		350		2.5		375		2.5			400	3.5	435		3.9		450
2	0.05	130
	0.1	140
	0.2	150		WY05-005MX				WY05-005MX				WY05-005MX				WY05-005MX
	0.3	160
	0.4	170		WY05-001MX				WY05-001MX				WY05-001MX				WY05-001MX
	0.6	190																		WY05-001MX			WY05-001MX
	0.8	220
	1.0	250
	1.3	300
5	0.05	130		WY01-014MX				WY01-014MX
	0.1	140		WY01-002MX				WY01-002MX
	0.2	150										WY01-002MX				WY01-002MX
	0.3	160		MY05-017MX				MY05-017MX				MY05-017MX				MY05-017MX
	0.4	170
	0.6	190		WY05-007MX				WY05-007MX				WY05-007MX				WY05-007MX				WY05-006MX			WY05-006MX
	0.8	220		WY05-004MX				WY05-004MX				WY05-004MX				WY05-004MX				WY05-005MX			WY05-005MX
	1.0	250
	1.3	300
10	0.05	130
	0.1	140		WY01-033MX				WY01-033MX
	0.2	150		WY01-015MX				WY01-015MX				WY01-015MX				WY01-015MX
	0.3	160		WY01-003MX				WY01-003MX				WY01-003MX				WY01-003MX
	0.4	170																		WY01-002MX			WY01-002MX
	0.5	180
	0.6	190
	0.7	220		WY05-018MX				WY05-018MX				WY05-018MX				WY05-018MX				WY05-017MX			WY05-017MX
	0.8	220
	1.0	250										WY05-018MX				WY05-018MX				WY05-017MX			WY05-017MX
	1.3	300																		WY05-007MX			WY05-007MX
	1.4	350
15	0.05	130
	0.1	140
	0.2	150		WY01-034MX				WY01-034MX				WY01-033MX				WY01-033MX
	0.3	160		WY01-016MX				WY01-016MX				WY01-015MX				WY01-015MX
	0.4	170		WY01-011MX				WY01-011MX				WY01-012MX				WY01-012MX				WY01-012MX			WY01-012MX
	0.7	220		WY01-004MX				WY01-004MX				WY01-003MX				WY01-003MX				WY01-003MX			WY01-003MX
	1.0	250
	1.3	300										WY05-018MX				WY05-018MX				WY05-018MX			WY05-018MX
	1.4	350
20	0.05	130
	0.1	140
	0.2	150		WY01-050MX				WY01-050MX				WY01-049MX				WY01-054MX
	0.3	160		WY01-034MX				WY01-034MX				WY01-034MX				WY01-024MX
	0.4	170		WY01-035MX				WY01-035MX												WY01-023MX			WY01-023MX
	0.5	180		WY01-017MX				WY01-017MX				WY01-016MX				WY01-016MX				WY01-023MX			WY01-023MX
	0.6	190										WY01-011MX				WY01-011MX				WY01-009MX			WY01-009MX
	0.7	200		WY01-017MX				WY01-017MX				WY01-011MX				WY01-011MX				WY01-009MX			WY01-009MX
	0.8	220		WY01-004MX								WY01-004MX				WY01-004MX				WY01-003MX			WY01-003MX
	1.0	250
	1.1	300
	1.2	250
	1.3	300
	1.4	350
25	0.05	130						WY02-027MX
	0.1	140						WY02-017MX
	0.2	150		WY01-059MX				WY01-064MX				WY01-065MX				WY01-065MX
	0.3	160		WY01-050MX				WY01-053MX				WY01-054MX				WY01-054MX
	0.4	170		WY01-035MX				WY01-025MX				WY01-024MX				WY01-024MX				WY01-023MX			WY01-023MX
	0.5	180
	0.7	200		WY01-017MX				WY01-017MX				WY01-016MX				WY01-019MX				WY01-023MX			WY01-023MX
	1.0	250										WY01-011MX				WY01-011MX				WY01-009MX			WY01-009MX
	1.2	250										WY01-004MX				WY01-004MX				WY01-009MX			WY01-009MX
	1.3	300										WY01-004MX				WY01-004MX				WY01-004MX			WY01-003MX
30	0.05	130		WY02-027MX				WY02-027MX
	0.1	140		WY02-017MX				WY02-017MX
	0.2	150		WY01-064MX				WY01-064MX				WY01-065MX				WY01-065MX
	0.3	160		WY01-059MX				WY01-064MX				WY01-065MX				WY01-065MX
	0.4	170		WY01-050MX				WY01-053MX				WY01-054MX				WY01-054MX				WY01-054MX			WY01-054MX
	0.5	180		WY01-035MX				WY01-025MX				WY01-024MX				WY01-024MX				WY01-024MX			WY01-024MX
	0.6	190
	0.7	200
	1.0	250										WY01-011MX				WY01-011MX				WY01-011MX			WY01-019MX
	1.3	300																					WY01-019MX
35	0.05	130		WY01-026MX				WY01-026MX
	0.1	140
	0.2	150
	0.3	160		WY01-063MX				WY01-063MX				WY01-065MX				WY01-065MX
	0.4	170										WY01-054MX				WY01-054MX				WY01-054MX			WY01-065MX
	0.5	180		WY01-063MX				WY01-063MX				WY01-054MX				WY01-054MX				WY01-054MX			WY01-065MX
	0.7	200						WY01-026MX				WY01-024MX				WY01-024MX				WY01-024MX			WY01-024MX
	1.0	250										WY01-017MX								WY01-019MX			WY01-019MX
	1.3	300														WY02-017MX
40	0.05	130
	0.1	140		WY02-026MX				WY02-026MX
	0.2	150		WY02-016MX				WY02-016MX				WY02-017MX				WY02-017MX
	0.3	160		WY01-063MX				WY01-063MX				WY01-064MX				WY01-064MX
	0.4	170																		WY01-065MX			WY01-065MX
	0.5	180
	0.6	190										WY01-053MX				WY01-053MX
	0.7	200										WY01-025MX				WY01-025MX
	0.8	220						WY02-026MX												WY01-024MX			WY01-024MX
	1.0	250
	1.1	300										WY01-035MX				WY01-035MX				WY01-024MX			WY01-024MX
	1.2	250																		WY01-019MX			WY01-019MX
	1.3	300										WY01-017MX				WY01-017MX				WY01-019MX			WY01-019MX
	1.4	350																		WY01-016MX			WY01-0167MX
60	0.05	130
	0.1	140
	0.2	150		WY02-025MX				WY02-025MX				WY02-026MX				WY02-026MX
	0.3	160		WY02-017MX				WY02-017MX				WY02-017MX				WY02-017MX
	0.4	170		WY02-017MX				WY02-017MX				WY02-016MX				WY02-016MX				WY02-017MX			WY02-017MX
	0.5	180
	0.6	190										WY01-63MX				WY01-63MX				WY01-064MX			WY01-064MX
	0.7	200
	0.8	220		WY01-062MX				WY01-062MX				WY01-63MX				WY01-63MX				WY01-064MX			WY01-064MX
	1.0	250																		WY01-053MX			WY01-053MX
	1.2	250
	1.3	300																		WY01-040MX			WY01-040MX
	1.4	400																		WY01039MX			WY01-039MX
流量 (t/h)	二次蒸汽参数				一次蒸汽参数P1、T1(℃)
	压力P2 MPa		温度T2 ℃		P1	T1			P1		T1		P1		T1		P1	T1		P1		T1		P1		T1
					1.3	300			1.3		350		2.5		375		2.5	400		3.5		435		3.9		450
80	0.05		130
	0.1		140
	0.2		150
	0.3		160		WY02-025MX				WY02-025MX				WY02-026MX				WY02-026MX
	0.4		170		WY02-015MX				WY02-015MX				WY02-015MX				WY02-016MX			WY02-017MX				WY02-017MX
	0.5		180
	0.6		190
	0.7		200
	0.8		220		WY01-062MX				WY01-062MX				WY01-063MX				WY01-063MX			WY01-063MX				WY01-064MX
	1.0		250
	1.2		250
	1.3		300										WY01-063MX				WY01-063MX
	1.4		350										WY01-060MX				WY01-060MX			WY01-063MX				WY01-063MX
120	0.3		160
	0.4		170
	0.5		180
	0.6		190		WY02-024MX				WY02-024MX				WY02-025MX
	0.7		200		WY02-024MX				WY02-024MX				WY02-025MX
	0.8		220		WY02-014MX				WY02-014MX				WY02-015MX				WY02-015MX
	1.0		250		WY02-014MX								WY02-015MX							WY02-015MX
	1.2		250
	1.3		300
	1.4		350

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Integrated medium temperature, medium pressure and sub high pressure temperature and pressure reducing device